{"id":52721,"date":"2026-03-30T08:00:00","date_gmt":"2026-03-30T00:00:00","guid":{"rendered":"https:\/\/zetarmold.com\/?p=52721"},"modified":"2026-04-09T08:03:05","modified_gmt":"2026-04-09T00:03:05","slug":"%e5%b0%84%e5%87%ba%e6%88%90%e5%bd%a2%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8b%e3%82%b7%e3%83%ab%e3%83%90%e3%83%bc%e3%82%b9%e3%83%88%e3%83%aa%e3%83%bc%e3%82%af%e3%81%a8%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99","status":"publish","type":"post","link":"https:\/\/zetarmold.com\/ja\/%e5%b0%84%e5%87%ba%e6%88%90%e5%bd%a2%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8b%e3%82%b7%e3%83%ab%e3%83%90%e3%83%bc%e3%82%b9%e3%83%88%e3%83%aa%e3%83%bc%e3%82%af%e3%81%a8%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99\/","title":{"rendered":"\u30e1\u30bf\u30eb\u30a4\u30f3\u30b5\u30fc\u30c8"},"content":{"rendered":"<p>\u91d1\u578b\u304b\u3089\u90e8\u54c1\u3092\u53d6\u308a\u5916\u3059\u3068\u3001\u305d\u3053\u306b\u3042\u308a\u307e\u3059\u2014\u2014\u30b7\u30eb\u30d0\u30fc\u30b9\u30c8\u30ea\u30fc\u30af\u3001\u672c\u6765\u304d\u308c\u3044\u306a\u8868\u9762\u3092\u6a2a\u5207\u308b\u3088\u3046\u306b\u8d70\u308b\u5fae\u7d30\u306a\u8f1d\u304f\u7dda\u3002\u6750\u6599\u306b\u4f55\u304b\u554f\u984c\u304c\u8d77\u304d\u305f\u3088\u3046\u306b\u898b\u3048\u307e\u3059\u3002\u6700\u521d\u306e\u76f4\u611f\u306f\u6a39\u8102\u3092\u3082\u3063\u3068\u9577\u304f\u4e7e\u71e5\u3055\u305b\u308b\u3053\u3068\u3067\u3059\u3002\u305d\u306e\u76f4\u611f\u306f\u7d0470%\u306e\u78ba\u7387\u3067\u9593\u9055\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u9280\u8272\u306e\u7b4b\u306f\u3001\u6700\u3082\u8aa4\u8a3a\u3055\u308c\u3084\u3059\u3044\u6b20\u9665\u306e\u4e00\u3064\u3067\u3059 <a href=\"https:\/\/zetarmold.com\/ja\/injection-mold-complete-guide\/\">\u5c04\u51fa\u6210\u5f62\u91d1\u578b<\/a>ing. Most engineers reach for the dryer first. At ZetarMold, we reach for the vent gauge. This guide breaks down exactly what causes silver streaks, how to tell them apart, and \u2014 most importantly \u2014 how to fix them without wasting 48 hours drying resin that wasn&#8217;t the problem.<\/p>\n<div class=\"callout-key\" style=\"background:#f0f7ff; border-left:4px solid #2563eb; padding:1em 1.2em; border-radius:6px; margin:1.5em 0;\">\n<strong>\u8981\u70b9<\/strong><\/p>\n<ul>\n<li>\u9280\u8272\u306e\u7b4b\u306f\u3001\u63ee\u767a\u6027\u7269\u8cea\u3001\u6c34\u5206\u3001\u307e\u305f\u306f\u9589\u3058\u8fbc\u3081\u3089\u308c\u305f\u7a7a\u6c17\u304c\u6eb6\u878d\u6d41\u8def\u306b\u6cbf\u3063\u3066\u5f15\u304d\u305a\u3089\u308c\u308b\u3053\u3068\u3067\u751f\u3058\u308b\u3001\u5149\u6ca2\u306e\u3042\u308b\u307e\u305f\u306f\u9280\u8272\u306e\u8868\u9762\u7dda\u3067\u3059\u3002<\/li>\n<li>\u6c34\u5206\u3001\u5206\u89e3\u30ac\u30b9\u3001\u304a\u3088\u3073\u4e0d\u5341\u5206\u306a\u30d9\u30f3\u30c6\u30a3\u30f3\u30b0\u304c\u4e09\u3064\u306e\u6839\u672c\u539f\u56e0\u3067\u3059 \u2014 \u305d\u308c\u305e\u308c\u7570\u306a\u308b\u4fee\u6b63\u304c\u5fc5\u8981\u3067\u3059\u3002<\/li>\n<li>\u30d9\u30f3\u30c6\u30a3\u30f3\u30b0\u8a2d\u8a08\u306f\u3001ZetarMold\u306b\u304a\u3051\u308b\u30b7\u30eb\u30d0\u30fc\u30b9\u30c8\u30ea\u30fc\u30af\u4e8b\u4f8b\u306e70%\u4ee5\u4e0a\u3092\u89e3\u6c7a\u3057\u307e\u3059\u2014\u2014\u6a39\u8102\u309248\u6642\u9593\u4e7e\u71e5\u3055\u305b\u308b\u524d\u306b\u30d9\u30f3\u30c8\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n<li>\u75c7\u72b6\u306e\u767a\u751f\u4f4d\u7f6e\u304c\u539f\u56e0\u3092\u793a\u3057\u307e\u3059\uff1a\u30b2\u30fc\u30c8\u8fd1\u304f\u306e\u7b4b\u306f\u6c34\u5206\u307e\u305f\u306f\u305b\u3093\u65ad\u3092\u6307\u3057\u3001\u5145\u586b\u672b\u7aef\u306e\u7b4b\u306f\u9589\u3058\u8fbc\u3081\u3089\u308c\u305f\u7a7a\u6c17\u3092\u6307\u3057\u307e\u3059\u3002<\/li>\n<li>\u30ad\u30e3\u30d3\u30c6\u30a3\u5145\u586b\u7aef\u306b0.025mm\u306e\u30d9\u30f3\u30c8\u30b9\u30ed\u30c3\u30c8\u3092\u8a2d\u3051\u308b\u3053\u3068\u3067\u3001\u9577\u6642\u9593\u4e7e\u71e5\u30b5\u30a4\u30af\u30eb\u3092\u7d4c\u3066\u3082\u6b8b\u5b58\u3059\u308b\u30b9\u30c8\u30ea\u30fc\u30af\u3092\u9664\u53bb\u3067\u304d\u307e\u3059\u3002<\/li>\n<\/ul>\n<\/div>\n<figure style=\"text-align:center;margin:2em 0;\">\n<img decoding=\"async\" src=\"https:\/\/www.zetarmold.com\/wp-content\/uploads\/2026\/03\/silver-streaks-injection-molding-defect.webp\" alt=\"\u5c04\u51fa\u6210\u5f62\u30d7\u30e9\u30b9\u30c1\u30c3\u30af\u8868\u9762\u306e\u30b7\u30eb\u30d0\u30fc\u30b9\u30c8\u30ea\u30fc\u30af\u4e0d\u826f\" style=\"max-width:100%;height:auto;\" \/><figcaption style=\"font-size:0.78em; color:#888; font-style:italic; margin-top:4px; text-align:center;\">\u6210\u5f62\u90e8\u54c1\u8868\u9762\u306e\u9280\u8272\u306e\u7b4b<\/figcaption><\/figure>\n<h2>\u5c04\u51fa\u6210\u5f62\u306b\u304a\u3051\u308b\u30b7\u30eb\u30d0\u30fc\u30b9\u30c8\u30ea\u30fc\u30af\u3068\u306f\uff1f<\/h2>\n<p>\u9280\u8272\u306e\u7b4b\uff08\u30b9\u30d7\u30ec\u30fc\u30de\u30fc\u30af\u307e\u305f\u306f\u30b7\u30eb\u30d0\u30fc\u30b9\u30d7\u30ec\u30fc\u3068\u3082\u547c\u3070\u308c\u308b\uff09\u306f\u3001\u5c04\u51fa\u6210\u5f62\u90e8\u54c1\u306e\u8868\u9762\u306b\u73fe\u308c\u308b\u3001\u6eb6\u878d\u6d41\u65b9\u5411\u306b\u5e73\u884c\u306b\u8d70\u308b\u3001\u304d\u3089\u3081\u304f\u7d30\u9577\u3044\u7dda\u3067\u3059\u3002\u6c17\u4f53\u307e\u305f\u306f\u84b8\u6c17\u304c\u6eb6\u878d\u30d5\u30ed\u30f3\u30c8\u306b\u4f34\u3063\u3066\u5f15\u304d\u305a\u3089\u308c\u3001\u8868\u9762\u306b\u8584\u3044\u6c17\u4f53\u5c64\u3092\u5f62\u6210\u3057\u3001\u5468\u56f2\u306e\u30d7\u30e9\u30b9\u30c1\u30c3\u30af\u3068\u306f\u7570\u306a\u308b\u5149\u306e\u53cd\u5c04\u3092\u751f\u307f\u51fa\u3059\u3053\u3068\u3067\u73fe\u308c\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u7b4b\u306f\u30b3\u30fc\u30c6\u30a3\u30f3\u30b0\u6b20\u9665\u3084\u6750\u6599\u30d0\u30c3\u30c1\u306e\u554f\u984c\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u6eb6\u878d\u30d5\u30ed\u30f3\u30c8\u304c\u91d1\u578b\u58c1\u306b\u885d\u7a81\u3059\u308b\u4e00\u77ac\u306e\u9593\u306b\u3001\u91d1\u578b\u5185\u90e8\u3067\u5f62\u6210\u3055\u308c\u307e\u3059\u3002\u6eb6\u878d\u4f53\u306b\u6df7\u5165\u3057\u305f\u6c17\u4f53\u304c\u30ad\u30e3\u30d3\u30c6\u30a3\u8868\u9762\u306b\u5f15\u304d\u305a\u3089\u308c\u3001\u7279\u5fb4\u7684\u306a\u9280\u8272\u307e\u305f\u306f\u767d\u8272\u306e\u75d5\u8de1\u3092\u6b8b\u3057\u307e\u3059\u3002<\/p>\n<p>\u9280\u8272\u306e\u7b4b\u306f\u3001\u5e45\u5e83\u3044\u7bc4\u56f2\u306b\u73fe\u308c\u307e\u3059 <a href=\"https:\/\/zetarmold.com\/ja\/thermoplastic\/\">\u71b1\u53ef\u5851\u6027\u30d7\u30e9\u30b9\u30c1\u30c3\u30af<\/a><sup id=\"fnref1:1\"><a href=\"#fn:1\" class=\"footnote-ref\">1<\/a><\/sup> \u2014 ABS\u3001PC\u3001PA\u3001PP\u306a\u3069\u3002\u8996\u899a\u52b9\u679c\u306f\u69d8\u3005\u3067\u3001\u6697\u3044\u90e8\u5206\u3067\u306f\u660e\u308b\u304f\u76ee\u7acb\u3061\u307e\u3059\u304c\u3001\u660e\u308b\u3044\u8272\u306e\u90e8\u5206\u3067\u306f\u3001\u90e8\u54c1\u3092\u76f4\u5c04\u5149\u306e\u4e0b\u3067\u898b\u308b\u307e\u3067\u5fae\u7d30\u306a\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h3>\u9280\u8272\u306e\u7b4b\u306e\u4e09\u3064\u306e\u6839\u672c\u539f\u56e0<\/h3>\n<p>\u751f\u7523\u306b\u304a\u3051\u308b\u9280\u8272\u306e\u7b4b\u306e\u5927\u90e8\u5206\u306f\u3001\u4e09\u3064\u306e\u6c17\u4f53\u6e90\u306b\u3088\u3063\u3066\u5f15\u304d\u8d77\u3053\u3055\u308c\u307e\u3059\uff1a<\/p>\n<p><strong>\u6c34\u5206\u84b8\u6c17<\/strong> \u2014 water absorbed by hygroscopic thermoplastics flashes to steam when it hits melt temperatures. This is the one everyone blames. It&#8217;s real, but it&#8217;s not the most common root cause.<\/p>\n<p><strong>\u71b1\u5206\u89e3\u30ac\u30b9<\/strong> \u2014\u2014\u904e\u5270\u306a\u30d0\u30ec\u30eb\u6e29\u5ea6\u307e\u305f\u306f\u6ede\u7559\u6642\u9593\u306f\u30dd\u30ea\u30de\u30fc\u9396\u3092\u5206\u89e3\u3057\u3001\u71c3\u713c\u526f\u751f\u6210\u7269\u3092\u653e\u51fa\u3057\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u30b9\u30c8\u30ea\u30fc\u30af\u306f\u7d14\u7c8b\u306a\u9280\u8272\u3067\u306f\u306a\u304f\u3001\u3057\u3070\u3057\u3070\u6697\u8272\u307e\u305f\u306f\u8910\u8272\u304c\u304b\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<p><strong>Trapped air<\/strong> \u2014 \u30d9\u30f3\u30c6\u30a3\u30f3\u30b0\u304c\u4e0d\u5341\u5206\u306a\u305f\u3081\u30ad\u30e3\u30d3\u30c6\u30a3\u304b\u3089\u9003\u3052\u3089\u308c\u306a\u3044\u7a7a\u6c17\u304c\u3001\u6eb6\u878d\u6a39\u8102\u30d5\u30ed\u30f3\u30c8\u3068\u5171\u306b\u6d41\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u306f\u5b9f\u52d9\u3067\u6700\u3082\u591a\u304f\u898b\u3089\u308c\u308b\u539f\u56e0\u3067\u3042\u308a\u3001\u8a3a\u65ad\u3067\u898b\u843d\u3068\u3055\u308c\u304c\u3061\u3067\u3059\u3002<\/p>\n<h2>\u30b7\u30eb\u30d0\u30fc\u30b9\u30c8\u30ea\u30fc\u30af\u306e\u539f\u56e0\u306f\uff1f\u6839\u672c\u539f\u56e0\u306e\u8a73\u7d30\u89e3\u8aac<\/h2>\n<p>\u9280\u8272\u306e\u7b4b\u306b\u306f\u4e09\u3064\u306e\u660e\u78ba\u306a\u6839\u672c\u539f\u56e0\u304c\u3042\u308a\u3001\u305d\u308c\u305e\u308c\u8a3a\u65ad\u306e\u7279\u5fb4\u3068\u4fee\u6b63\u65b9\u6cd5\u304c\u7570\u306a\u308a\u307e\u3059\u3002\u8a3a\u65ad\u3092\u8aa4\u308b\u3068\u3001\u9593\u9055\u3063\u305f\u89e3\u6c7a\u7b56\u306b\u6642\u9593\u3068\u8cbb\u7528\u3092\u8cbb\u3084\u3059\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<h3>\u539f\u56e01: \u5438\u6e7f\u6027\u6a39\u8102\u306e\u6c34\u5206<\/h3>\n<p>\u5438\u6e7f\u6027\u6a39\u8102\u2014\u2014PC\u3001ABS\u3001PA6\u3001PA66\u3001PBT\u3001PET\u2014\u2014\u306f\u5468\u56f2\u306e\u7a7a\u6c17\u304b\u3089\u6c34\u5206\u3092\u5438\u53ce\u3057\u307e\u3059\u3002\u6c34\u5206\u542b\u6709\u91cf\u304c\u81e8\u754c\u95be\u5024\uff08\u4e00\u822c\u7684\u306bPC\u30670.02%\u3001ABS\u30670.2%\uff09\u3092\u8d85\u3048\u308b\u3068\u3001\u30d0\u30ec\u30eb\u5185\u3067\u84b8\u767a\u3057\u3066\u84b8\u6c17\u6c17\u6ce1\u3092\u5f62\u6210\u3057\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u6c17\u6ce1\u306f\u305b\u3093\u65ad\u3055\u308c\u3001\u90e8\u54c1\u8868\u9762\u306b\u7d30\u9577\u3044\u30b7\u30eb\u30d0\u30fc\u30b9\u30c8\u30ea\u30fc\u30af\u3068\u3057\u3066\u73fe\u308c\u307e\u3059\u3002<\/p>\n<p>\u6c34\u5206\u306b\u3088\u308b\u7b4b\u306f\u30b2\u30fc\u30c8\u8fd1\u304f\u306b\u73fe\u308c\u3001\u5916\u5074\u306b\u5e83\u304c\u308a\u307e\u3059\u3002\u30b7\u30e7\u30c3\u30c8\u3054\u3068\u306b\u4e00\u8cab\u3057\u3066\u73fe\u308c\u3001\u30ad\u30e3\u30d3\u30c6\u30a3\u5185\u306e\u3069\u3053\u3092\u898b\u3066\u3082\u73fe\u308c\u307e\u3059\u3002\u4e7e\u71e5\u6642\u9593\u3092\u5897\u3084\u3057\u3066\u7b4b\u304c\u6e1b\u5c11\u3059\u308c\u3070\u3001\u6c34\u5206\u304c\u539f\u56e0\u3067\u3057\u305f\u3002\u9069\u5207\u306a\u4e7e\u71e5\u30924\u6642\u9593\u4ee5\u4e0a\u884c\u3063\u3066\u3082\u6301\u7d9a\u3059\u308b\u5834\u5408\u306f\u3001\u4ed6\u306e\u539f\u56e0\u3092\u63a2\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p>Standard moisture silver streak fix: dry at the resin manufacturer&#8217;s recommended temperature (typically 80\u00b0C\u2013120\u00b0C depending on material) for the specified time. Measure moisture content with a moisture analyzer \u2014 don&#8217;t guess by time alone. For PC, target \u22640.02% before processing.<\/p>\n<h3>\u539f\u56e02: \u71b1\u5206\u89e3<\/h3>\n<p>\u30d0\u30ec\u30eb\u6e29\u5ea6\u304c\u9ad8\u3059\u304e\u308b\u304b\u6ede\u7559\u6642\u9593\u304c\u904e\u5270\u306a\u5834\u5408\u3001\u30dd\u30ea\u30de\u30fc\u9396\u304c\u5206\u89e3\u3057\u63ee\u767a\u6027\u30ac\u30b9\u3092\u653e\u51fa\u3057\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u3057\u3070\u3057\u3070\u8910\u8272\u304c\u304b\u3063\u305f\u9280\u8272\u306e\u3001\u307e\u305f\u306f\u308f\u305a\u304b\u306b\u713c\u3051\u5909\u8272\u3057\u305f\u30b9\u30c8\u30ea\u30fc\u30af\u304c\u751f\u3058\u307e\u3059\u3002\u5206\u89e3\u306b\u3088\u308b\u30b9\u30c8\u30ea\u30fc\u30af\u306f\u5145\u586b\u672b\u7aef\u90e8\u2014\u2014\u6a39\u8102\u304c\u9ad8\u6e29\u306b\u3055\u3089\u3055\u308c\u305f\u6642\u9593\u304c\u6700\u3082\u9577\u3044\u5834\u6240\u2014\u2014\u3067\u3088\u308a\u6df1\u523b\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u4e00\u822c\u7684\u306a\u5206\u89e3\u306e\u5f15\u304d\u91d1\uff1a\u63a8\u5968\u7bc4\u56f2\u3088\u308a20\u00b0C\u4ee5\u4e0a\u9ad8\u3044\u30d0\u30ec\u30eb\u6e29\u5ea6\u8a2d\u5b9a\uff1b\u30d0\u30ec\u30eb\u5bb9\u91cf\u306b\u5bfe\u3057\u3066\u6a5f\u68b0\u306e\u30b7\u30e7\u30c3\u30c8\u30b5\u30a4\u30ba\u304c\u5c0f\u3055\u3059\u304e\u308b\uff08\u6a39\u8102\u304c\u30d0\u30ec\u30eb\u5185\u306b\u6ede\u7559\u3057\u3059\u304e\u308b\uff09\uff1b\u305b\u3093\u65ad\u71b1\u3092\u767a\u751f\u3055\u305b\u308b\u904e\u5270\u306a\u30b9\u30af\u30ea\u30e5\u30fc\u30d0\u30c3\u30af\u30d7\u30ec\u30c3\u30b7\u30e3\u30fc\u3002\u30d0\u30ec\u30eb\u6e29\u5ea6\u30925\u00b0C\u523b\u307f\u3067\u4e0b\u3052\u308b\u3001\u30b7\u30e7\u30c3\u30c8\u5bfe\u30d0\u30ec\u30eb\u6bd4\u3092\u5897\u3084\u3059\u3001\u307e\u305f\u306f\u30d0\u30c3\u30af\u30d7\u30ec\u30c3\u30b7\u30e3\u30fc\u3092\u4f4e\u6e1b\u3059\u308b\u3053\u3068\u3067\u4fee\u6b63\u3002<\/p>\n<h3>\u539f\u56e03\uff1a\u9589\u3058\u8fbc\u3081\u3089\u308c\u305f\u7a7a\u6c17\u3068\u4e0d\u9069\u5207\u306a\u30d9\u30f3\u30c6\u30a3\u30f3\u30b0<\/h3>\n<p>\u9589\u3058\u8fbc\u3081\u3089\u308c\u305f\u7a7a\u6c17\u306f\u3001\u9280\u8272\u306e\u7b4b\u306e\u4e2d\u3067\u6700\u3082\u8a3a\u65ad\u3055\u308c\u306b\u304f\u3044\u539f\u56e0\u3067\u3059\u3002\u30d7\u30e9\u30b9\u30c1\u30c3\u30af\u304c\u30ad\u30e3\u30d3\u30c6\u30a3\u3092\u5145\u586b\u3059\u308b\u969b\u3001\u524d\u65b9\u306e\u7a7a\u6c17\u3092\u5727\u7e2e\u3057\u307e\u3059\u3002\u305d\u306e\u7a7a\u6c17\u304c\u30d9\u30f3\u30c8\u30b9\u30ed\u30c3\u30c8\u304b\u3089\u9003\u3052\u3089\u308c\u306a\u3044\u5834\u5408\u3001\u6eb6\u878d\u30d5\u30ed\u30f3\u30c8\u306b\u5dfb\u304d\u8fbc\u307e\u308c\u3001\u30ad\u30e3\u30d3\u30c6\u30a3\u8868\u9762\u306b\u9280\u8272\u306e\u30b9\u30d7\u30ec\u30fc\u3068\u3057\u3066\u5f15\u304d\u305a\u3089\u308c\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u7b4b\u306f\u3001\u30b2\u30fc\u30c8\u3067\u306f\u306a\u304f\u3001\u30ad\u30e3\u30d3\u30c6\u30a3\u306e\u5145\u586b\u672b\u7aef\u307e\u305f\u306f\u305d\u306e\u8fd1\u304f\u306b\u73fe\u308c\u307e\u3059\u3002<\/p>\n<p>\u30d9\u30f3\u30c6\u30a3\u30f3\u30b0\u4e0d\u826f\u306f\u3001\u30b7\u30e7\u30fc\u30c8\u30b7\u30e7\u30c3\u30c8\u3001\u713c\u3051\u8de1\u3001\u6975\u7aef\u306a\u5834\u5408\u306b\u306f\u30c7\u30a3\u30fc\u30bc\u30eb\u52b9\u679c\u3082\u5f15\u304d\u8d77\u3053\u3057\u307e\u3059\u3002\u9589\u3058\u8fbc\u3081\u3089\u308c\u305f\u7a7a\u6c17\u306b\u3088\u308b\u9280\u6761\u75d5\u306f\u4e0d\u898f\u5247\u3067\u3001\u5c04\u51fa\u901f\u5ea6\u304c\u5909\u308f\u308b\u3068\u767a\u751f\u7b87\u6240\u304c\u5909\u52d5\u3057\u3001\u6750\u6599\u4e7e\u71e5\u3067\u306f\u6539\u5584\u3055\u308c\u307e\u305b\u3093\u3002\u5bfe\u7b56\u306f\u30d9\u30f3\u30c8\u8a2d\u8a08\u3067\u3059\u3002\u9069\u5207\u306a\u4f4d\u7f6e\u306b\u30d9\u30f3\u30c8\u6e9d\u3092\u8ffd\u52a0\u307e\u305f\u306f\u6df1\u304f\u3057\u307e\u3059\u3002<\/p>\n<div class=\"factory-insight\" style=\"background:#f0f7ff;border-left:4px solid #0066cc;padding:12px 16px;margin:1.5em 0;\"><strong>\ud83c\udfed ZetarMold Factory Insight<\/strong><br \/>At ZetarMold, 70% of silver streak defect cases we diagnose are resolved by venting design \u2014 not material drying. We&#8217;ve seen customers run 48-hour drying cycles without fixing silver streaks, then eliminate the defect entirely by adding a 0.025mm vent slot at the fill end of the cavity. Venting should always be the first diagnostic step.<\/div>\n<h2>\u30b7\u30eb\u30d0\u30fc\u30b9\u30c8\u30ea\u30fc\u30af\u306e\u8a3a\u65ad\u65b9\u6cd5\uff1a\u5834\u6240\u304c\u539f\u56e0\u3092\u6559\u3048\u3066\u304f\u308c\u308b<\/h2>\n<p>\u30d7\u30ed\u30bb\u30b9\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u8abf\u6574\u3059\u308b\u524d\u306b\u3001\u30b9\u30c8\u30ea\u30fc\u30af\u304c\u73fe\u308c\u3066\u3044\u308b\u5834\u6240\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u5834\u6240\u306f\u6700\u3082\u4fe1\u983c\u6027\u306e\u9ad8\u3044\u8a3a\u65ad\u306e\u624b\u304c\u304b\u308a\u3067\u3059\u3002<\/p>\n<table style=\"width:100%;border-collapse:collapse;margin:1.5em 0;\">\n<caption style=\"font-weight:bold;margin-bottom:0.5em;\">\u30b7\u30eb\u30d0\u30fc\u30b9\u30c8\u30ea\u30fc\u30af\u306e\u4f4d\u7f6e vs \u6839\u672c\u539f\u56e0<\/caption>\n<thead>\n<tr>\n<th style=\"border:1px solid #ddd;padding:8px;background:#f5f5f5;\">\u7b4b\u306e\u767a\u751f\u4f4d\u7f6e<\/th>\n<th style=\"border:1px solid #ddd;padding:8px;background:#f5f5f5;\">Most Likely Cause<\/th>\n<th style=\"border:1px solid #ddd;padding:8px;background:#f5f5f5;\">\u6700\u521d\u306b\u8a66\u3059\u4fee\u6b63\u65b9\u6cd5<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">\u30b2\u30fc\u30c8\u4ed8\u8fd1\u3001\u30b7\u30e7\u30c3\u30c8\u9593\u3067\u4e00\u8cab<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">\u6c34\u5206\u84b8\u6c17<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">\u6307\u5b9a\u6e29\u5ea6\/\u6642\u9593\u3067\u6a39\u8102\u3092\u4e7e\u71e5<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">\u30b2\u30fc\u30c8\u4ed8\u8fd1\u3001\u8910\u8272\u304c\u304b\u3063\u305f\u8272\u5408\u3044<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">\u71b1\u5206\u89e3<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">\u30d0\u30ec\u30eb\u6e29\u5ea6\u30925\u00b0C\u523b\u307f\u3067\u4e0b\u3052\u308b<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">\u30ad\u30e3\u30d3\u30c6\u30a3\u306e\u5145\u586b\u672b\u7aef\u90e8<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">\u7a7a\u6c17\u9589\u3058\u8fbc\u3081 \/ \u30d9\u30f3\u30c6\u30a3\u30f3\u30b0\u4e0d\u826f<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Add or deepen vent slots<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">Across entire surface<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Multiple causes combined<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Check vents first, then dry<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">Random, shifts with speed changes<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Trapped air<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Reduce injection speed \/ add vents<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">After extended shutdown restart<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Moisture + degraded resin<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Purge + dry fresh material<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>One practical test: run 3 shots at reduced injection speed (50% of normal). If silver streaks disappear or move, trapped air is involved \u2014 the gas has more time to escape. If streaks are unchanged at slower fill, moisture or decomposition is the primary cause.<\/p>\n<h2>\u771f\u507d\u30af\u30a4\u30ba\uff1a\u30b7\u30eb\u30d0\u30fc\u30b9\u30c8\u30ea\u30fc\u30af\u306b\u95a2\u3059\u308b\u4e00\u822c\u7684\u306a\u8aa4\u89e3<\/h2>\n<div class=\"claim claim-true\" style=\"background-color: #eff7ef; border-color: #eff7ef; color: #5a8a5a;\">\n<p><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 24 24\" width=\"20\" height=\"20\" fill=\"currentColor\"><path d=\"M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z\"><\/path><\/svg><b>&#8220;Silver streaks can occur even when resin has been properly dried.&#8221;<\/b><span class=\"claim-true-or-false\">\u771f<\/span><\/p>\n<p class=\"claim-explanation\">Properly dried resin eliminates moisture as a cause, but trapped air and thermal decomposition can still produce silver streaks independently. Drying removes one of three potential causes \u2014 not all of them. If venting is inadequate, silver streaks will persist regardless of moisture content.<\/p>\n<\/div>\n<div class=\"claim claim-false\" style=\"background-color: #f7e8e8; border-color: #f7e8e8; color: #8a4a4a;\">\n<p><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 24 24\" width=\"20\" height=\"20\" fill=\"currentColor\"><path d=\"M19 6.41L17.59 5 12 10.59 6.41 5 5 6.41 10.59 12 5 17.59 6.41 19 12 13.41 17.59 19 19 17.59 13.41 12z\"><\/path><\/svg><b>&#8220;Silver streaks always mean the resin is too wet.&#8221;<\/b><span class=\"claim-true-or-false\">\u507d<\/span><\/p>\n<p class=\"claim-explanation\">This is the most common misconception in injection molding troubleshooting. At ZetarMold, venting issues and thermal decomposition together account for the majority of silver streak cases. Moisture is one cause among three \u2014 and often not the primary one. Diagnosing silver streaks as purely a drying problem leads to wasted time and unchanged defects.<\/p>\n<\/div>\n<h3>More Myths About Silver Streaks<\/h3>\n<p>Two more silver streak claims you&#8217;ve probably heard on the shop floor \u2014 one is accurate, one will send you on a troubleshooting detour. Check your assumptions here before adjusting the process. These distinctions matter because the wrong diagnosis means the wrong fix, and silver streak troubleshooting is already time-consuming enough without chasing the wrong variable. Injection speed and venting interact in ways that are not obvious: slowing fill helps confirm an air-trap diagnosis, but it is not a long-term solution. Surface defects that look cosmetic can hide structural issues.<\/p>\n<div class=\"claim claim-true\" style=\"background-color: #eff7ef; border-color: #eff7ef; color: #5a8a5a;\">\n<p><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 24 24\" width=\"20\" height=\"20\" fill=\"currentColor\"><path d=\"M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z\"><\/path><\/svg><b>&#8220;Increasing injection speed can worsen silver streaks caused by trapped air.&#8221;<\/b><span class=\"claim-true-or-false\">\u771f<\/span><\/p>\n<p class=\"claim-explanation\">Higher injection speed compresses air faster in the cavity, leaving less time for it to escape through vents. This intensifies silver streaks from trapped air. The fix is adding proper venting, not reducing speed \u2014 though slowing fill temporarily during troubleshooting can help confirm the diagnosis.<\/p>\n<\/div>\n<div class=\"claim claim-false\" style=\"background-color: #f7e8e8; border-color: #f7e8e8; color: #8a4a4a;\">\n<p><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 24 24\" width=\"20\" height=\"20\" fill=\"currentColor\"><path d=\"M19 6.41L17.59 5 12 10.59 6.41 5 5 6.41 10.59 12 5 17.59 6.41 19 12 13.41 17.59 19 19 17.59 13.41 12z\"><\/path><\/svg><b>&#8220;Silver streaks are purely cosmetic and do not affect part strength.&#8221;<\/b><span class=\"claim-true-or-false\">\u507d<\/span><\/p>\n<p class=\"claim-explanation\">Silver streaks indicate that gas was present at the melt-mold interface during filling. This can mean incomplete fusion, micro-porosity, or surface delamination \u2014 all of which reduce mechanical properties. Parts with visible silver streaks on structural surfaces should be tested before accepting them as functional.<\/p>\n<\/div>\n<h2>\u9280\u8272\u306e\u7b4b\u306e\u4fee\u6b63\u65b9\u6cd5\uff1a\u30d7\u30ed\u30bb\u30b9\u8abf\u6574<\/h2>\n<p>Fix silver streaks systematically: one variable at a time, in order of likelihood based on your location diagnosis.<\/p>\n<h3>Venting Fixes<\/h3>\n<p>Start here if streaks appear at fill-end or are irregular. Standard vent slot depth for thermoplastics is 0.015\u20130.025mm (deep enough to let air out, shallow enough to prevent flash). Vent land length: 0.5\u20131.0mm. Vent width: 5\u201310mm per vent. Add vents at the last-fill location \u2014 this is where trapped air concentrates.<\/p>\n<p>If the mold has existing vents, check if they are clogged with mold release or carbonized resin. Clean vents with a brass brush \u2014 steel will enlarge the slot. After cleaning, run 5 shots and check if silver streaks reduce. If vents are open but inadequate, deepen gradually in 0.005mm increments.<\/p>\n<h3>Drying and Temperature Fixes<\/h3>\n<p>For moisture-related streaks, use a properly calibrated dehumidifying dryer (not a hot-air dryer for critical resins). Measure residual moisture with an at-line moisture analyzer. Target values: PC \u22640.02%, ABS \u22640.1%, PA66 \u22640.2%. Use a moisture-proof hopper or sealed conveying system to prevent reabsorption during transfer.<\/p>\n<p>For decomposition, reduce barrel temperature in the rear zones first. Check screw speed and backpressure \u2014 excessive shear adds 20\u201330\u00b0C of effective melt temperature above setpoint. Use a melt thermocouple if available to measure actual melt temperature, not just barrel setpoint.<\/p>\n<h2>\u9280\u8272\u306e\u7b4b\u3068\u4ed6\u306e\u8868\u9762\u6b20\u9665\uff1a\u898b\u5206\u3051\u65b9<\/h2>\n<p>Silver streaks are sometimes confused with other surface defects. Getting the identification right matters because each defect has a different root cause and fix.<\/p>\n<p><strong>Silver streaks vs. flow marks<\/strong> \u2014 Flow marks are concentric rings or wavy patterns caused by slow fill speed and premature skin formation. They follow the melt front shape. Silver streaks are linear and parallel to flow direction, caused by gas. Flow marks respond to increased injection speed; silver streaks from trapped air worsen with higher speed.<\/p>\n<h3>Silver Streaks vs. Burn Marks and Delamination<\/h3>\n<p><strong>Silver streaks vs. burn marks<\/strong> \u2014 Burn marks (also called diesel effect) are black or dark brown discoloration at fill-end, caused by compressed air igniting under extreme pressure. They are more severe than silver streaks and usually indicate severely blocked venting. Silver streaks are a warning sign that precedes burn marks as venting deteriorates.<\/p>\n<p><strong>Silver streaks vs. <a href=\"https:\/\/zetarmold.com\/ja\/%e6%ba%b6%e6%8e%a5%e3%83%a9%e3%82%a4%e3%83%b3-%e5%b0%84%e5%87%ba%e6%88%90%e5%bd%a2\/\">weld line<\/a><sup id=\"fnref1:2\"><a href=\"#fn:2\" class=\"footnote-ref\">2<\/a><\/sup><\/strong> \u2014 A weld line appears where two melt fronts meet, creating a visible seam or line. Weld lines are often accompanied by a notch or groove in the surface. Silver streaks are surface reflectance anomalies without physical topology change. Different fixes: weld line problems are addressed through <a href=\"https:\/\/zetarmold.com\/ja\/%e5%b0%84%e5%87%ba%e6%88%90%e5%bd%a2%e7%94%a8%e9%87%91%e5%9e%8b%e3%81%ae%e3%83%a9%e3%83%b3%e3%83%8a%e3%83%bc%e3%81%a8%e3%82%b2%e3%83%bc%e3%83%88%e8%a8%ad%e8%a8%88%e3%81%a8%e3%81%af\/\">gate design<\/a><sup id=\"fnref1:3\"><a href=\"#fn:3\" class=\"footnote-ref\">3<\/a><\/sup> and melt temperature optimization; silver streaks through venting, drying, or temperature control.<\/p>\n<p><strong>Silver streaks vs. delamination<\/strong> \u2014 Delamination produces layers that peel away from the part surface, usually caused by contamination (incompatible material mixed in) or excessive moisture. Silver streaks do not peel \u2014 they are a surface optical effect. If the surface lifts or flakes, contamination or severe moisture is the cause, not normal silver splay.<\/p>\n<h2>\u9280\u8272\u306e\u7b4b\u306e\u9632\u6b62\uff1a\u8a2d\u8a08\u3068\u30d7\u30ed\u30bb\u30b9\u5236\u5fa1<\/h2>\n<p>Prevention is faster than troubleshooting. These controls, applied at the design and setup stage, eliminate the conditions that create silver streaks before the first shot.<\/p>\n<h3>Mold Design Controls<\/h3>\n<p>Vent at every last-fill location, at runners, and along long flow paths. Place vents at parting line, ejector pins, and through insert splits where possible. For deep or complex cavities where parting-line vents are insufficient, consider vacuum venting or porous insert venting in chronic dead-air zones.<\/p>\n<p>Gate design affects silver streak tendency. Gates that are too small create high shear rates, generating heat and gas. Gates that introduce air directly into the cavity (air entrapment at gate) cause gate-proximal streaks. Proper gate design accounts for melt temperature at the gate, shear rate limits, and gate placement relative to vented areas.<\/p>\n<p>Wall thickness transitions should be gradual \u2014 abrupt thick-to-thin transitions cause hesitation and turbulence, trapping air. Where thickness changes are required by design, use tapered transitions over \u22653\u00d7 the wall thickness change distance.<\/p>\n<h3>Process and Material Controls<\/h3>\n<p>Establish a material drying protocol as a standard operating procedure \u2014 not just for production startup, but including maximum time in hopper before material is replaced. Thermoplastics reabsorb moisture after drying; typical safe hopper time for PC is 2\u20134 hours before moisture rises above threshold again.<\/p>\n<p>Set barrel temperature profiles correctly for the specific resin and shot weight. Use a rear-zone temperature that is 10\u201320\u00b0C lower than the front zone to prevent premature plasticization and decomposition. Monitor residence time: shot weight should be at least 20\u201325% of barrel capacity to prevent excessive dwell at temperature.<\/p>\n<p>\u90e8\u54c1\u306b\u6b20\u9665\u304c\u306a\u3044\u5834\u5408\u306e\u30d9\u30fc\u30b9\u30e9\u30a4\u30f3\u30d7\u30ed\u30bb\u30b9\u8a2d\u5b9a\u3092\u6587\u66f8\u5316\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u30b7\u30eb\u30d0\u30fc\u30b9\u30c8\u30ea\u30fc\u30af\u306f\u3001\u30aa\u30da\u30ec\u30fc\u30bf\u30fc\u304c\u751f\u7523\u4e2d\u306b\u30d1\u30e9\u30e1\u30fc\u30bf\u30fc\u3092\u8abf\u6574\u3057\u3001\u5909\u66f4\u3092\u8a18\u9332\u3057\u306a\u3044\u5834\u5408\u306b\u983b\u7e41\u306b\u767a\u751f\u3057\u307e\u3059\u3002\u8a2d\u5b9a\u5024\u304c\u56fa\u5b9a\u3055\u308c\u305f\u30d7\u30ed\u30bb\u30b9\u30b7\u30fc\u30c8\u306f\u3001\u7e70\u308a\u8fd4\u3057\u767a\u751f\u3059\u308b\u30b7\u30eb\u30d0\u30fc\u30b9\u30c8\u30ea\u30fc\u30af\u554f\u984c\u306b\u5bfe\u3057\u3066\u6700\u3082\u52b9\u679c\u7684\u306a\u4e88\u9632\u30c4\u30fc\u30eb\u3067\u3059\u3002<\/p>\n<h2>\u3088\u304f\u3042\u308b\u8cea\u554f<\/h2>\n<h3>\u5c04\u51fa\u6210\u5f62\u3067\u9280\u6761\u304c\u767a\u751f\u3059\u308b\u539f\u56e0\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n<p>\u30b7\u30eb\u30d0\u30fc\u30b9\u30c8\u30ea\u30fc\u30af\u306f\u3001\u91d1\u578b\u5145\u586b\u4e2d\u306b\u30ad\u30e3\u30d3\u30c6\u30a3\u8868\u9762\u3092\u6a2a\u5207\u3063\u3066\u5f15\u304d\u305a\u3089\u308c\u308b\u3001\u9589\u3058\u8fbc\u3081\u3089\u308c\u305f\u7a7a\u6c17\u3001\u6c34\u5206\u84b8\u6c17\u3001\u307e\u305f\u306f\u71b1\u5206\u89e3\u30ac\u30b9\u306b\u3088\u3063\u3066\u5f15\u304d\u8d77\u3053\u3055\u308c\u307e\u3059\u3002\u4e0d\u5341\u5206\u306a\u30d9\u30f3\u30c8\u306b\u3088\u308b\u9589\u3058\u8fbc\u3081\u3089\u308c\u305f\u7a7a\u6c17\u306f\u3001\u751f\u7523\u74b0\u5883\u3067\u306f\u6700\u3082\u4e00\u822c\u7684\u306a\u539f\u56e0\u3067\u3042\u308a\u3001ZetarMold\u3067\u306f\u75c7\u4f8b\u306e70%\u4ee5\u4e0a\u3092\u5360\u3081\u307e\u3059\u3002\u5438\u6e7f\u6027\u6a39\u8102\u4e2d\u306e\u6c34\u5206\u306f2\u756a\u76ee\u306b\u983b\u7e41\u306a\u539f\u56e0\u3067\u3059 \u2014 \u6c34\u5206\u542b\u6709\u91cf\u304c\u95be\u5024\uff08\u4f8b\uff1aPC\u3067\u306f0.02%\uff09\u3092\u8d85\u3048\u308b\u3068\u3001\u84b8\u6c17\u306b\u5909\u5316\u3057\u3001\u8868\u9762\u306e\u30b9\u30c8\u30ea\u30fc\u30af\u3068\u3057\u3066\u305b\u3093\u65ad\u3055\u308c\u307e\u3059\u3002\u904e\u5ea6\u306e\u30d0\u30ec\u30eb\u6e29\u5ea6\u307e\u305f\u306f\u9577\u3044\u6ede\u7559\u6642\u9593\u306b\u3088\u308b\u71b1\u5206\u89e3\u306f\u3001\u8336\u8272\u304c\u304b\u3063\u305f\u30b7\u30eb\u30d0\u30fc\u30b9\u30c8\u30ea\u30fc\u30af\u3092\u751f\u307f\u51fa\u3057\u30013\u756a\u76ee\u306e\u539f\u56e0\u3067\u3059\u3002<\/p>\n<h3>\u5c04\u51fa\u6210\u5f62\u306b\u304a\u3051\u308b\u9280\u6761\u75d5\u3092\u3069\u306e\u3088\u3046\u306b\u4fee\u6b63\u3059\u308c\u3070\u3088\u3044\u3067\u3059\u304b\uff1f<\/h3>\n<p>\u30b7\u30eb\u30d0\u30fc\u30b9\u30c8\u30ea\u30fc\u30af\u3092\u4fee\u6b63\u3059\u308b\u306b\u306f\u3001\u307e\u305a\u30b9\u30c8\u30ea\u30fc\u30af\u306e\u4f4d\u7f6e\u304b\u3089\u539f\u56e0\u3092\u7279\u5b9a\u3057\u307e\u3059\u3002\u5145\u586b\u672b\u7aef\u306e\u30b9\u30c8\u30ea\u30fc\u30af\u306f\u9589\u3058\u8fbc\u3081\u3089\u308c\u305f\u7a7a\u6c17\u3092\u793a\u3057\u307e\u3059 \u2014 \u6700\u7d42\u5145\u586b\u4f4d\u7f6e\u306b\u6df1\u30550.015\uff5e0.025mm\u306e\u30d9\u30f3\u30c8\u30b9\u30ed\u30c3\u30c8\u3092\u8ffd\u52a0\u3057\u307e\u3059\u3002\u4e00\u8cab\u3057\u305f\u30d1\u30bf\u30fc\u30f3\u3067\u73fe\u308c\u308b\u30b2\u30fc\u30c8\u9818\u57df\u306e\u30b9\u30c8\u30ea\u30fc\u30af\u306f\u6c34\u5206\u3092\u793a\u3057\u307e\u3059 \u2014 \u9664\u6e7f\u4e7e\u71e5\u6a5f\u3092\u4f7f\u7528\u3057\u3066\u3001\u30e1\u30fc\u30ab\u30fc\u6307\u5b9a\u306e\u6c34\u5206\u542b\u6709\u91cf\u307e\u3067\u6a39\u8102\u3092\u4e7e\u71e5\u3055\u305b\u307e\u3059\u3002\u5909\u8272\u3092\u4f34\u3046\u8336\u8272\u304c\u304b\u3063\u305f\u30b2\u30fc\u30c8\u9818\u57df\u306e\u30b9\u30c8\u30ea\u30fc\u30af\u306f\u71b1\u5206\u89e3\u3092\u793a\u3057\u307e\u3059 \u2014 \u30d0\u30ec\u30eb\u6e29\u5ea6\u30925\u00b0C\u523b\u307f\u3067\u4e0b\u3052\u3001\u6ede\u7559\u6642\u9593\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002\u30d9\u30f3\u30c8\u72b6\u614b\u3092\u6700\u521d\u306b\u691c\u67fb\u305b\u305a\u306b\u3001\u4e7e\u71e5\u3060\u3051\u3067\u30b7\u30eb\u30d0\u30fc\u30b9\u30c8\u30ea\u30fc\u30af\u304c\u4fee\u6b63\u3055\u308c\u308b\u3068\u6c7a\u3057\u3066\u60f3\u5b9a\u3057\u306a\u3044\u3067\u304f\u3060\u3055\u3044\u3002\u8a70\u307e\u3063\u305f\u30d9\u30f3\u30c8\u306f\u3001\u6700\u3082\u4e00\u822c\u7684\u306b\u898b\u843d\u3068\u3055\u308c\u3066\u3044\u308b\u539f\u56e0\u3067\u3059\u3002<\/p>\n<h3>\u9280\u8272\u306e\u7b4b\u306f\u90e8\u54c1\u306e\u5f37\u5ea6\u306b\u5f71\u97ff\u3057\u307e\u3059\u304b\uff1f<\/h3>\n<p>\u306f\u3044 \u2014 \u30b7\u30eb\u30d0\u30fc\u30b9\u30c8\u30ea\u30fc\u30af\u306f\u8868\u9762\u306e\u5b8c\u5168\u6027\u3092\u4f4e\u4e0b\u3055\u305b\u3001\u90e8\u54c1\u8868\u9762\u306e\u5fae\u5c0f\u6c17\u5b54\u307e\u305f\u306f\u4e0d\u5b8c\u5168\u306a\u878d\u5408\u3092\u793a\u3057\u3066\u3044\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u5145\u586b\u6642\u306b\u6eb6\u878d\u6a39\u8102\u3068\u91d1\u578b\u306e\u754c\u9762\u306b\u6c17\u4f53\u304c\u9589\u3058\u8fbc\u3081\u3089\u308c\u308b\u3068\u3001\u7d50\u679c\u306f\u898b\u305f\u76ee\u3060\u3051\u306e\u554f\u984c\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u5f71\u97ff\u3092\u53d7\u3051\u305f\u8868\u9762\u9818\u57df\u306f\u3001\u5468\u56f2\u306e\u6750\u6599\u3068\u6bd4\u8f03\u3057\u3066\u5bc6\u5ea6\u3068\u7d50\u5408\u5f37\u5ea6\u304c\u4f4e\u4e0b\u3057\u3066\u3044\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u8ca0\u8377\u3092\u53d7\u3051\u308b\u8868\u9762\u306b\u76ee\u306b\u898b\u3048\u308b\u30b7\u30eb\u30d0\u30fc\u30b9\u30c8\u30ea\u30fc\u30af\u304c\u3042\u308b\u69cb\u9020\u90e8\u54c1\u306f\u3001\u53d7\u3051\u5165\u308c\u524d\u306b\u6a5f\u68b0\u8a66\u9a13\u3092\u884c\u3046\u3079\u304d\u3067\u3059\u3002\u5316\u7ca7\u9762\u306e\u30b7\u30eb\u30d0\u30fc\u30b9\u30c8\u30ea\u30fc\u30af\u306f\u3001\u7279\u306b\u81ea\u52d5\u8eca\u304a\u3088\u3073\u6c11\u751f\u96fb\u5b50\u6a5f\u5668\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306b\u304a\u3044\u3066\u3001\u307b\u3068\u3093\u3069\u306eOEM\u4ed5\u69d8\u66f8\u3067\u6a19\u6e96\u7684\u306a\u4e0d\u5408\u683c\u57fa\u6e96\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<h3>\u9280\u8272\u306e\u7b4b\u306f\u3001\u3088\u308a\u826f\u3044\u6750\u6599\u4e7e\u71e5\u3067\u9632\u3050\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u304b\uff1f<\/h3>\n<p>\u4e7e\u71e5\u306f\u3001\u6c34\u5206\u95a2\u9023\u306e\u30b7\u30eb\u30d0\u30fc\u30b9\u30c8\u30ea\u30fc\u30af\u306e\u307f\u3092\u9632\u6b62\u3059\u308b\u3002\u6839\u672c\u539f\u56e0\u304c\u4e0d\u9069\u5207\u306a\u30d9\u30f3\u30c8\u306b\u3088\u308b\u7a7a\u6c17\u9589\u3058\u8fbc\u3081\u3001\u307e\u305f\u306f\u904e\u5270\u306a\u30b7\u30ea\u30f3\u30c0\u30fc\u6e29\u5ea6\u306b\u3088\u308b\u71b1\u5206\u89e3\u3067\u3042\u308b\u5834\u5408\u3001\u4e7e\u71e5\u3067\u306f\u4e0d\u826f\u306f\u89e3\u6d88\u3055\u308c\u306a\u3044 \u2014 48\u6642\u9593\u4e7e\u71e5\u3057\u3066\u3082\u540c\u3058\u30b9\u30c8\u30ea\u30fc\u30af\u304c\u6b8b\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3002\u9069\u5207\u306a\u4e7e\u71e5\u306f3\u3064\u306e\u4e88\u9632\u30b9\u30c6\u30c3\u30d7\u306e1\u3064\u3067\u3042\u308b\uff1a\u9069\u5207\u306a\u30d9\u30f3\u30c8\u8a2d\u8a08\u304c\u6700\u521d\u3067\u6700\u3082\u5f71\u97ff\u529b\u306e\u3042\u308b\u7ba1\u7406\u9805\u76ee\u3001\u6b63\u3057\u3044\u30b7\u30ea\u30f3\u30c0\u30fc\u6e29\u5ea6\u3068\u6ede\u7559\u6642\u9593\u7ba1\u7406\u304c2\u756a\u76ee\u3001\u6307\u5b9a\u3055\u308c\u305f\u6c34\u5206\u542b\u6709\u91cf\u307e\u3067\u306e\u6750\u6599\u4e7e\u71e5\u304c3\u756a\u76ee\u3067\u3042\u308b\u3002\u4e00\u8cab\u3057\u305f\u7121\u4e0d\u826f\u751f\u7523\u306e\u305f\u3081\u306b\u306f\u3001\u3053\u308c\u30893\u3064\u3059\u3079\u3066\u304c\u6574\u3063\u3066\u3044\u308b\u5fc5\u8981\u304c\u3042\u308b\u3002<\/p>\n<h3>\u9280\u8272\u306e\u7b4b\u3068\u5e83\u304c\u3063\u305f\u75d5\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n<p>\u30b7\u30eb\u30d0\u30fc\u30b9\u30c8\u30ea\u30fc\u30af\u3068\u30b9\u30d7\u30ec\u30fc\u30de\u30fc\u30af\u306f\u540c\u3058\u4e0d\u826f\u3092\u6307\u3059 \u2014 \u3053\u308c\u3089\u306e\u7528\u8a9e\u306f\u3001\u91d1\u578b\u5145\u586b\u6642\u306e\u30ac\u30b9\u5dfb\u304d\u8fbc\u307f\u306b\u3088\u3063\u3066\u751f\u3058\u308b\u540c\u4e00\u306e\u8868\u9762\u4e0d\u826f\u3092\u8aac\u660e\u3059\u308b\u3002\u300e\u30b9\u30d7\u30ec\u30fc\u30de\u30fc\u30af\u300f\u306f\u3001\u30a8\u30f3\u30b8\u30cb\u30a2\u30ea\u30f3\u30b0\u4ed5\u69d8\u66f8\u3084\u4e0d\u826f\u30ab\u30bf\u30ed\u30b0\u3067\u4f7f\u7528\u3055\u308c\u308b\u3088\u308a\u6280\u8853\u7684\u306a\u696d\u754c\u7528\u8a9e\u3067\u3042\u308b\u3002\u300e\u30b7\u30eb\u30d0\u30fc\u30b9\u30c8\u30ea\u30fc\u30af\u300f\u306f\u3001\u30aa\u30da\u30ec\u30fc\u30bf\u30fc\u3084\u54c1\u8cea\u691c\u67fb\u54e1\u304c\u4f7f\u7528\u3059\u308b\u4e00\u822c\u7684\u306a\u73fe\u5834\u3067\u306e\u547c\u79f0\u3067\u3042\u308b\u3002\u3069\u3061\u3089\u3082\u3001\u6210\u5f62\u54c1\u8868\u9762\u306b\u73fe\u308c\u308b\u3001\u6eb6\u878d\u6d41\u52d5\u65b9\u5411\u306b\u5e73\u884c\u306b\u8d70\u308b\u7d30\u9577\u3044\u30ad\u30e9\u30ad\u30e9\u3057\u305f\u3001\u307e\u305f\u306f\u9280\u8272\u306e\u7dda\u3092\u8868\u3059\u3002\u4f7f\u7528\u3059\u308b\u7528\u8a9e\u306b\u95a2\u4fc2\u306a\u304f\u3001\u8a3a\u65ad\u3001\u6839\u672c\u539f\u56e0\u5206\u6790\u3001\u662f\u6b63\u63aa\u7f6e\u306f\u540c\u4e00\u3067\u3042\u308b\u3002<\/p>\n<h3>\u9280\u306e\u7b4b\u72b6\u306e\u6c17\u6ce1\u3092\u9632\u3050\u305f\u3081\u306e\u30d9\u30f3\u30c8\u30b9\u30ed\u30c3\u30c8\u306e\u6df1\u3055\u306f\u3069\u306e\u304f\u3089\u3044\u306b\u3059\u3079\u304d\u3067\u3059\u304b\uff1f<\/h3>\n<p>\u307b\u3068\u3093\u3069\u306e\u71b1\u53ef\u5851\u6027\u6a39\u8102\u7528\u306e\u30d9\u30f3\u30c8\u6e9d\u306f\u3001\u30e9\u30f3\u30c9\u90e8\u3067\u6df1\u30550.015\uff5e0.025mm\u3001\u5e455\uff5e10mm\u3068\u3057\u3001\u30e9\u30f3\u30c9\u5f8c\u65b9\u306b\u6df1\u30550.5\uff5e1.0mm\u306e\u30d9\u30f3\u30c8\u30ea\u30ea\u30fc\u30d5\u30c1\u30e3\u30cd\u30eb\u3092\u8a2d\u3051\u3066\u7a7a\u6c17\u3092\u91d1\u578b\u304b\u3089\u81ea\u7531\u306b\u6392\u51fa\u3067\u304d\u308b\u3088\u3046\u306b\u3059\u308b\u3002\u30d9\u30f3\u30c8\u6df1\u3055\u304c0.04mm\u3092\u8d85\u3048\u308b\u3068\u3001\u307b\u3068\u3093\u3069\u306e\u6a19\u6e96\u6a39\u8102\u3067\u30d0\u30ea\u767a\u751f\u306e\u30ea\u30b9\u30af\u304c\u3042\u308b\u3002\u6700\u5f8c\u306b\u5145\u586b\u3055\u308c\u308b\u4f4d\u7f6e\u306b\u30d9\u30f3\u30c8\u3092\u8ffd\u52a0\u3059\u308b \u2014 \u3053\u308c\u306f\u30ad\u30e3\u30d3\u30c6\u30a3\u5145\u586b\u6642\u306b\u6eb6\u878d\u30d5\u30ed\u30f3\u30c8\u304c\u9589\u3058\u308b\u306b\u3064\u308c\u3066\u9589\u3058\u8fbc\u3081\u3089\u308c\u305f\u7a7a\u6c17\u304c\u96c6\u4e2d\u3059\u308b\u5834\u6240\u3067\u3042\u308b\u3002\u9ad8\u7c98\u5ea6\u6a39\u8102\u3084\u8907\u96d1\u306a\u5f62\u72b6\u306e\u5834\u5408\u3001\u30d9\u30f3\u30c8\u6df1\u3055\u3092\u5897\u3084\u3059\u524d\u306b\u30d9\u30f3\u30c8\u6570\u3092\u5897\u3084\u3057\u3001\u30d0\u30ea\u30ea\u30b9\u30af\u3092\u6700\u5c0f\u9650\u306b\u6291\u3048\u3064\u3064\u6392\u6c17\u3092\u6700\u5927\u5316\u3059\u308b\u3002<\/p>\n<h3>\u6a39\u8102\u30ed\u30c3\u30c8\u3092\u5909\u66f4\u3057\u305f\u5f8c\u306b\u9280\u7b4b\u304c\u73fe\u308c\u308b\u306e\u306f\u306a\u305c\u3067\u3059\u304b\uff1f<\/h3>\n<p>\u6a39\u8102\u30ed\u30c3\u30c8\u5909\u66f4\u306b\u3088\u308a\u3001\u7570\u306a\u308b\u6c34\u5206\u542b\u6709\u91cf\u3001\u30e1\u30eb\u30c8\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u5909\u52d5\u3001\u307e\u305f\u306f\u6dfb\u52a0\u5264\u6fc3\u5ea6\u306e\u9055\u3044\u304c\u751f\u3058\u3001\u52a0\u5de5\u4e2d\u306e\u63ee\u767a\u5206\u767a\u751f\u306b\u5f71\u97ff\u3092\u4e0e\u3048\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3002\u30ed\u30c3\u30c8\u5909\u66f4\u5f8c\u306b\u30b7\u30eb\u30d0\u30fc\u30b9\u30c8\u30ea\u30fc\u30af\u304c\u73fe\u308c\u305f\u5834\u5408\u306f\u3001\u307e\u305a\u6c34\u5206\u8a08\u3067\u65b0\u30ed\u30c3\u30c8\u306e\u6c34\u5206\u542b\u6709\u91cf\u3092\u78ba\u8a8d\u3059\u308b \u2014 \u4e7e\u71e5\u6a5f\u8a2d\u5b9a\u304c\u65b0\u30ed\u30c3\u30c8\u306e\u521d\u671f\u6c34\u5206\u30ec\u30d9\u30eb\u306b\u9069\u3057\u3066\u3044\u308b\u3068\u60f3\u5b9a\u3057\u306a\u3044\u3002\u6b21\u306b\u3001\u524d\u30ed\u30c3\u30c8\u304b\u3089\u306e\u30e1\u30eb\u30c8\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u5909\u52d5\u304c\u3001\u30b7\u30ea\u30f3\u30c0\u30fc\u6e29\u5ea6\u3084\u80cc\u5727\u306e\u8abf\u6574\u3092\u5fc5\u8981\u3068\u3059\u308b\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3059\u308b\u3002\u30e1\u30eb\u30c8\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u4f4e\u3044\u65b0\u30ed\u30c3\u30c8\u306f\u5145\u586b\u306e\u305f\u3081\u306b\u9ad8\u3044\u6e29\u5ea6\u3084\u5727\u529b\u3092\u5fc5\u8981\u3068\u3057\u3001\u5206\u89e3\u95be\u5024\u3092\u8d85\u3048\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3002\u30d7\u30ed\u30bb\u30b9\u30ed\u30b0\u306b\u30ed\u30c3\u30c8\u9593\u306e\u5909\u52d5\u3092\u8a18\u9332\u3059\u308b\u3002<\/p>\n<p>\u7c21\u6613\u8a3a\u65ad\u30eb\u30fc\u30eb\uff1a\u5145\u586b\u672b\u7aef\u306e\u30b9\u30c8\u30ea\u30fc\u30af \u2192 \u30d9\u30f3\u30c8\u8ffd\u52a0\uff1b\u30b2\u30fc\u30c8\u4ed8\u8fd1\u306e\u30b9\u30c8\u30ea\u30fc\u30af \u2192 \u6a39\u8102\u4e7e\u71e5\uff1b\u8336\u8272\u304c\u304b\u3063\u305f\u30b9\u30c8\u30ea\u30fc\u30af \u2192 \u30b7\u30ea\u30f3\u30c0\u30fc\u6e29\u5ea6\u4f4e\u4e0b\u3002\u307e\u305a\u30d9\u30f3\u30c8\u3092\u78ba\u8a8d\u3059\u308b \u2014 \u3053\u308c\u306f20\u5206\u306e\u70b9\u691c\u3067\u300148\u6642\u9593\u306e\u4e0d\u8981\u306a\u4e7e\u71e5\u3092\u7701\u3051\u308b\u3002\u65b0\u91d1\u578b\u3092\u8a2d\u8a08\u3059\u308b\u5834\u5408\u306f\u3001T0\u524d\u306b\u3059\u3079\u3066\u306e\u6700\u7d42\u5145\u586b\u4f4d\u7f6e\u306b\u30d9\u30f3\u30c8\u6e9d\u3092\u8a2d\u3051\u308b\u3002\u4e8b\u5f8c\u7684\u306a\u30d9\u30f3\u30c8\u52a0\u5de5\u306f\u53ef\u80fd\u3060\u304c\u3001\u8a08\u753b\u7684\u306a\u30d9\u30f3\u30c8\u8a2d\u8a08\u304c\u5e38\u306b\u512a\u308c\u3066\u3044\u308b\u3002<\/p>\n<figure style=\"text-align:center;margin:2em 0;\">\n<img decoding=\"async\" src=\"https:\/\/www.zetarmold.com\/wp-content\/uploads\/2026\/02\/800x457_plastic-injection-defects-examples.jpg\" alt=\"\u30b7\u30eb\u30d0\u30fc\u30b9\u30c8\u30ea\u30fc\u30af\u3092\u542b\u3080\u5c04\u51fa\u6210\u5f62\u8868\u9762\u4e0d\u826f\u306e\u4f8b\" style=\"max-width:100%;height:auto;\" \/><figcaption style=\"font-size:0.78em; color:#888; font-style:italic; margin-top:4px; text-align:center;\">\u5c04\u51fa\u6210\u5f62\u8868\u9762\u4e0d\u826f\u306e\u4f8b<\/figcaption><\/figure>\n<p>\u6301\u7d9a\u7684\u306a\u30b7\u30eb\u30d0\u30fc\u30b9\u30c8\u30ea\u30fc\u30af\u306e\u8a3a\u65ad\u3084\u65b0\u91d1\u578b\u306e\u30d9\u30f3\u30c8\u8a2d\u8a08\u3067\u304a\u56f0\u308a\u3067\u3059\u304b\uff1f ZetarMold\u306e\u30a8\u30f3\u30b8\u30cb\u30a2\u30ea\u30f3\u30b0\u30c1\u30fc\u30e0\u306f\u4e0d\u826f\u30b1\u30fc\u30b9\u3092\u30ec\u30d3\u30e5\u30fc\u3057\u307e\u3059 \u2014 \u90e8\u54c1\u5199\u771f\u3068\u73fe\u884c\u306e\u5de5\u7a0b\u30b7\u30fc\u30c8\u3092\u304a\u6301\u3061\u3044\u305f\u3060\u3051\u308c\u3070\u3001\u6700\u521d\u306b\u3069\u3053\u3092\u78ba\u8a8d\u3059\u3079\u304d\u304b\u304a\u4f1d\u3048\u3057\u307e\u3059\u3002<\/p>\n<hr style=\"margin:2em 0;border:none;border-top:1px solid #e0e0e0;\" \/>\n<ol class=\"footnotes\">\n<li id=\"fn:1\">\n<p><strong>thermoplastics:<\/strong> \u71b1\u53ef\u5851\u6027\u6a39\u8102\u306f\u3001\u52a0\u71b1\u3059\u308b\u3068\u8edf\u5316\u3057\u3066\u6210\u5f62\u53ef\u80fd\u306b\u306a\u308a\u3001\u51b7\u5374\u3059\u308b\u3068\u56fa\u5316\u3059\u308b\u6750\u6599\u3068\u5b9a\u7fa9\u3055\u308c\u308b\u30dd\u30ea\u30de\u30fc\u306e\u4e00\u7a2e\u3067\u3042\u308a\u3001\u71b1\u786c\u5316\u6027\u6a39\u8102\u3068\u306f\u7570\u306a\u308a\u3001\u5316\u5b66\u7684\u52a3\u5316\u306a\u304f\u7e70\u308a\u8fd4\u3057\u52a0\u5de5\u304c\u53ef\u80fd\u3067\u3042\u308b\u3002\u4e00\u822c\u7684\u306a\u4f8b\u306b\u306fABS\u3001PC\u3001PA\u3001PP\u306a\u3069\u304c\u3042\u308b\u3002 <a href=\"#fnref1:1\" class=\"footnote-backref\">\u21a9<\/a><\/p>\n<\/li>\n<li id=\"fn:2\">\n<p><strong>weld line:<\/strong> \u6eb6\u63a5\u30e9\u30a4\u30f3\u306f\u3001\u5c04\u51fa\u6210\u5f62\u6642\u306b\u91d1\u578b\u30ad\u30e3\u30d3\u30c6\u30a3\u5185\u30672\u3064\u306e\u6eb6\u878d\u30d5\u30ed\u30f3\u30c8\u304c\u5408\u6d41\u3059\u308b\u5834\u6240\u306b\u5f62\u6210\u3055\u308c\u308b\u76ee\u306b\u898b\u3048\u308b\u7d99\u304e\u76ee\u307e\u305f\u306f\u5f31\u3044\u7d50\u5408\u90e8\u3067\u3042\u308a\u3001\u6bcd\u6750\u3068\u6bd4\u8f03\u3057\u3066\u6a5f\u68b0\u7684\u5f37\u5ea6\u304c10\uff5e40%\u4f4e\u4e0b\u3059\u308b\u3053\u3068\u304c\u591a\u3044\u3002 <a href=\"#fnref1:2\" class=\"footnote-backref\">\u21a9<\/a><\/p>\n<\/li>\n<li id=\"fn:3\">\n<p><strong>gate design:<\/strong> \u30b2\u30fc\u30c8\u8a2d\u8a08\u3068\u306f\u3001\u6eb6\u878d\u30d7\u30e9\u30b9\u30c1\u30c3\u30af\u304c\u30e9\u30f3\u30ca\u30fc\u304b\u3089\u91d1\u578b\u30ad\u30e3\u30d3\u30c6\u30a3\u3078\u6d41\u308c\u8fbc\u3080\u5165\u53e3\u70b9\u306e\u5f62\u72b6\u3001\u4f4d\u7f6e\u3001\u30b5\u30a4\u30b8\u30f3\u30b0\u3092\u6307\u3057\u3001\u5145\u586b\u30d1\u30bf\u30fc\u30f3\u3001\u5727\u529b\u5206\u5e03\u3001\u8868\u9762\u54c1\u8cea\u306b\u76f4\u63a5\u5f71\u97ff\u3092\u4e0e\u3048\u308b\u3002 <a href=\"#fnref1:3\" class=\"footnote-backref\">\u21a9<\/a><\/p>\n<\/li>\n<\/ol>\n<p><script type=\"application\/ld+json\">{\n    \"@context\": \"https:\\\/\\\/schema.org\",\n    \"@type\": \"FAQPage\",\n    \"mainEntity\": [\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What causes silver streaks in injection molding?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Silver streaks are caused by trapped air, moisture vapor, or thermal decomposition gases being dragged across the cavity surface during mold fill. Trapped air from inadequate venting is the most common cause in production environments, accounting for over 70% of cases at ZetarMold. Moisture in hygroscopic resins is the second most frequent cause \\u2014 when moisture content exceeds threshold (e.g., 0.02% for PC), it vaporizes into steam that shears into surface streaks. Thermal degradation from exces\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How do I fix silver streaks in injection molding?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Fix silver streaks by first identifying the cause from streak location. Fill-end streaks indicate trapped air \\u2014 add vent slots at 0.015\\u20130.025mm depth at the last-fill location. Gate-area streaks appearing in consistent patterns indicate moisture \\u2014 dry resin to the manufacturer's specified moisture content using a dehumidifying dryer. Brownish gate-area streaks with discoloration indicate thermal decomposition \\u2014 lower barrel temperature in 5\\u00b0C increments and check residence time. Never assume dry\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Do silver streaks affect part strength?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes \\u2014 silver streaks can reduce surface integrity and may indicate micro-porosity or incomplete fusion at the part surface. When gas is trapped at the melt-mold interface during fill, the result is not just cosmetic. The affected surface zone can have reduced density and bonding compared to the surrounding material. Structural parts with visible silver streaks on load-bearing surfaces should be mechanically tested before acceptance. Silver streaks on cosmetic surfaces are a standard rejection cr\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Can silver streaks be prevented with better material drying?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Drying prevents moisture-related silver streaks only. If the root cause is trapped air from inadequate venting or thermal decomposition from excessive barrel temperature, drying will not eliminate the defect \\u2014 you can dry for 48 hours and still have the same streaks. Proper drying is one of three prevention steps: adequate venting design is the first and most impactful control, correct barrel temperature and residence time management is the second, and material drying to specified moisture conte\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What is the difference between silver streaks and splay marks?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Silver streaks and splay marks refer to the same defect \\u2014 the terms describe identical surface defects caused by gas inclusion during mold fill. 'Splay marks' is the more technical industry term used in engineering specifications and defect catalogs; 'silver streaks' is the common production floor name used by operators and quality inspectors. Both describe elongated shimmering or silvery lines on the molded part surface, running parallel to melt flow direction. The diagnosis, root cause analysi\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How deep should vent slots be to prevent silver streaks from trapped air?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Vent slots for most thermoplastics should be 0.015\\u20130.025mm deep at the land area, 5\\u201310mm wide, with a vent relief channel 0.5\\u20131.0mm deep behind the land to allow air to exit the mold freely. Vent depth above 0.04mm risks flash on most standard resins. Add vents at the last-fill location \\u2014 this is where trapped air concentrates as the melt front closes in during cavity fill. For highly viscous resins or complex geometries, increase vent count before increasing vent depth to minimize flash risk wh\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Why do silver streaks appear after I change resin lots?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Resin lot changes can introduce different moisture content, melt index variation, or additive concentration differences that affect volatile generation during processing. If silver streaks appear after a lot change, first confirm moisture content of the new lot with a moisture analyzer \\u2014 do not assume the dryer settings are adequate for the new lot's initial moisture level. Then check if melt index variance from the previous lot requires barrel temperature or backpressure adjustment. A new lot w\"\n            }\n        }\n    ]\n}<\/script><\/p>\n<div style=\"background:#f0f4f8;padding:20px;border-radius:8px;margin-top:30px;\">\n<p style=\"margin:0 0 10px;font-size:18px;\"><strong>Need a Quote for Your Injection Molding Project?<\/strong><\/p>\n<p style=\"margin:0 0 10px;\">Get competitive pricing, DFM feedback, and production timeline from ZetarMold\u2019s engineering team.<\/p>\n<p style=\"margin:0;\"><a href=\"https:\/\/zetarmold.com\/ja\/%e3%81%8a%e5%95%8f%e3%81%84%e5%90%88%e3%82%8f%e3%81%9b\/\" style=\"background:#2563eb;color:white;padding:12px 24px;border-radius:6px;text-decoration:none;font-weight:bold;\">Request a Free Quote \u2192<\/a> See our <strong>Injection Molding Complete Guide<\/strong> for a comprehensive overview. See our <a href=\"https:\/\/zetarmold.com\/ja\/injection-molding-complete-guide\/\">Injection Molding Complete Guide<\/a> for a comprehensive overview.<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>\u578b\u304b\u3089\u90e8\u54c1\u3092\u53d6\u308a\u5916\u3059\u3068\u3001\u305d\u3053\u306b\u73fe\u308c\u308b\u306e\u306f\u9280\u8272\u306e\u7b4b\u2014\u2014\u672c\u6765\u306a\u3089\u6e05\u6d44\u306a\u8868\u9762\u3092\u6a2a\u5207\u308b\u3001\u304d\u3089\u3081\u304f\u7dda\u6761\u3067\u3059\u3002\u307e\u308b\u3067\u6750\u6599\u306b\u4f55\u304b\u554f\u984c\u304c\u3042\u3063\u305f\u304b\u306e\u3088\u3046\u306b\u898b\u3048\u307e\u3059\u3002\u6700\u521d\u306b\u601d\u3044\u3064\u304f\u306e\u306f\u3001\u6a39\u8102\u3092\u3082\u3063\u3068\u9577\u304f\u4e7e\u71e5\u3055\u305b\u308b\u3053\u3068\u3067\u3057\u3087\u3046\u3002\u305d\u306e\u76f4\u611f\u306f\u300170%\u306e\u78ba\u7387\u3067\u8aa4\u3063\u3066\u3044\u307e\u3059\u3002\u9280\u6761\u75d5\u306f\u5c04\u51fa\u6210\u5f62\u306b\u304a\u3044\u3066\u6700\u3082\u8aa4\u8a3a\u3055\u308c\u3084\u3059\u3044\u4e0d\u826f\u306e\u4e00\u3064\u3067\u3059\u3002\u591a\u304f\u306e\u30a8\u30f3\u30b8\u30cb\u30a2\u306f\u307e\u305a\u4e7e\u71e5\u6a5f\u306b\u624b\u3092\u4f38\u3070\u3057\u307e\u3059\u3002ZetarMold\u3067\u306f\u3001\u79c1\u305f\u3061\u306f\u30d9\u30f3\u30c8\u30b2\u30fc\u30b8\u306b\u624b\u3092\u4f38\u3070\u3057\u307e\u3059\u3002\u3053\u306e\u30ac\u30a4\u30c9\u3067\u306f\u3001\u9280\u6761\u75d5\u306e\u539f\u56e0\u3001\u898b\u5206\u3051\u65b9\u3001\u305d\u3057\u3066\u6700\u3082\u91cd\u8981\u306a\u2014\u2014\u4e7e\u71e5\u304c\u5fc5\u8981\u306a\u304b\u3063\u305f\u6a39\u8102\u309248\u6642\u9593\u3082\u7121\u99c4\u306b\u3059\u308b\u3053\u3068\u306a\u304f\u3001\u3069\u3046\u4fee\u6b63\u3059\u308b\u304b\u3092\u8a73\u7d30\u306b\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>","protected":false},"author":1,"featured_media":52710,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_seopress_robots_primary_cat":"","_seopress_titles_title":"What Are Silver Streaks in Injection Molding? | ZetarMold","_seopress_titles_desc":"Silver streaks in injection molding are caused by trapped air, moisture, or decomposition. Diagnose by location and fix with 0.025mm vent slots.","_seopress_robots_index":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[45],"tags":[159,160,161],"meta_box":{"post-to-quiz_to":[]},"_links":{"self":[{"href":"https:\/\/zetarmold.com\/ja\/wp-json\/wp\/v2\/posts\/52721"}],"collection":[{"href":"https:\/\/zetarmold.com\/ja\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/zetarmold.com\/ja\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/zetarmold.com\/ja\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/zetarmold.com\/ja\/wp-json\/wp\/v2\/comments?post=52721"}],"version-history":[{"count":0,"href":"https:\/\/zetarmold.com\/ja\/wp-json\/wp\/v2\/posts\/52721\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/zetarmold.com\/ja\/wp-json\/wp\/v2\/media\/52710"}],"wp:attachment":[{"href":"https:\/\/zetarmold.com\/ja\/wp-json\/wp\/v2\/media?parent=52721"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/zetarmold.com\/ja\/wp-json\/wp\/v2\/categories?post=52721"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/zetarmold.com\/ja\/wp-json\/wp\/v2\/tags?post=52721"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}