{"id":34762,"date":"2024-08-30T16:45:41","date_gmt":"2024-08-30T08:45:41","guid":{"rendered":"https:\/\/zetarmold.com\/?p=34762"},"modified":"2026-05-29T19:02:24","modified_gmt":"2026-05-29T11:02:24","slug":"enjeksiyon-kaliplama-ayirma-yuzeyleri-cizgileri","status":"publish","type":"post","link":"https:\/\/zetarmold.com\/tr\/enjeksiyon-kaliplama-ayirma-yuzeyleri-cizgileri\/","title":{"rendered":"Enjeksiyon Kal\u0131plama Par\u00e7alama Y\u00fczeyleri (\u00c7izgiler): Kapsaml\u0131 Bir K\u0131lavuz"},"content":{"rendered":"<p>Prensip 4: Havaland\u0131rmay\u0131 Optimize Edin <a href=\"https:\/\/www.iso.org\/standard\/72712.html\">ay\u0131rma \u00e7izgisi<\/a><sup id=\"fnref1:1\"><a href=\"#fn:1\" class=\"footnote-ref\">1<\/a><\/sup> bir kusur de\u011fildir; bu, ka\u00e7\u0131n\u0131lmaz bir \u00f6zelli\u011fidir <a href=\"https:\/\/zetarmold.com\/tr\/injection-molding-complete-guide\/\">enjeksiyon kal\u0131plama<\/a> process. But where you put it, and how you design around it, can make the difference between a production-ready part and a costly redesign.<\/p>\n<p>Kal\u0131p at\u00f6lyemizde, m\u00fchendislerin ay\u0131rma \u00e7izgisini yanl\u0131\u015f yapt\u0131\u011f\u0131n\u0131 sayamayaca\u011f\u0131m\u0131z kadar \u00e7ok kez g\u00f6rd\u00fck. Basit g\u00f6r\u00fcn\u00fcyor \u2014 sadece kal\u0131b\u0131 ikiye b\u00f6l\u00fcn \u2014 ta ki ay\u0131rma \u00e7izgisinin tam olarak nerede oldu\u011funu fark edene kadar. <a href=\"https:\/\/www.iso.org\/standard\/72712.html\">fla\u015f<\/a><sup id=\"fnref1:2\"><a href=\"#fn:2\" class=\"footnote-ref\">2<\/a><\/sup> g\u00f6r\u00fcn\u00fcr, hangi boyutlar\u0131n s\u0131k\u0131 bir toleransa tabi tutuldu\u011fu, par\u00e7an\u0131n kal\u0131ptan d\u00fczg\u00fcn \u015fekilde \u00e7\u0131kar\u0131l\u0131p \u00e7\u0131kar\u0131lamayaca\u011f\u0131 ve kal\u0131p maliyetinin ne kadar olaca\u011f\u0131. Bu k\u0131lavuz, m\u00fchendislerin ay\u0131rma y\u00fczeyleri ve ay\u0131rma \u00e7izgileri hakk\u0131nda bilmesi gereken her \u015feyi kapsar, b\u00f6ylece ilk seferde do\u011fru yapabilirsiniz.<\/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>\u00d6nemli \u00c7\u0131kar\u0131mlar<\/strong><\/p>\n<ul>\n<li>The parting line is the physical trace left where two mold halves meet during injection.<\/li>\n<li>Parting surface design directly impacts part quality, mold cost, and production efficiency.<\/li>\n<li>Five main types: flat, stepped, angled, curved, and composite parting surfaces.<\/li>\n<li>DFM analysis before tooling can prevent 80% of parting-line-related production issues.<\/li>\n<li>Flash at the parting line is controlled by mold precision, clamping force, and material selection.<\/li>\n<\/ul>\n<\/div>\n<figure style=\"text-align:center;margin:2em 0;\">\n<img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"457\" src=\"https:\/\/zetarmold.com\/wp-content\/uploads\/2025\/11\/injection-molding-defects-guide.webp\" alt=\"Visual guide to common injection molding defects\" class=\"wp-image-51585 size-full\" style=\"max-width:100%;height:auto;\" srcset=\"https:\/\/zetarmold.com\/wp-content\/uploads\/2025\/11\/injection-molding-defects-guide.webp 800w, https:\/\/zetarmold.com\/wp-content\/uploads\/2025\/11\/injection-molding-defects-guide-300x171.webp 300w, https:\/\/zetarmold.com\/wp-content\/uploads\/2025\/11\/injection-molding-defects-guide-768x439.webp 768w, https:\/\/zetarmold.com\/wp-content\/uploads\/2025\/11\/injection-molding-defects-guide-18x10.webp 18w, https:\/\/zetarmold.com\/wp-content\/uploads\/2025\/11\/injection-molding-defects-guide-600x343.webp 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption style=\"font-size:0.78em; color:#888; font-style:italic; margin-top:4px; text-align:center;\">Parting line flash is one.<\/figcaption><\/figure>\n<h2>What Is a Parting Surface in Injection Molding?<\/h2>\n<p>Bir ay\u0131rma y\u00fczeyi, iki kal\u0131p yar\u0131s\u0131n\u0131n enjeksiyon s\u0131ras\u0131nda bulu\u015ftu\u011fu ve kapatt\u0131\u011f\u0131 d\u00fcz veya konturlu ara y\u00fczeydir. Tedarik\u00e7ileri kar\u015f\u0131la\u015ft\u0131r\u0131yorsan\u0131z veya tedarik planl\u0131yorsan\u0131z, bizim <a href=\"https:\/\/zetarmold.com\/tr\/injection-molding-supplier-sourcing-guide\/\">injection molding supplier sourcing guide<\/a> covers RFQ prep, qualification, and commercial risk checks.<\/p>\n<p>A parting surface is the contact interface between two mold halves \u2014 the cavity side (A-side) and the core side (B-side). When the mold closes, these two surfaces press together under tons of clamping force. The parting line is the narrow trace this interface leaves on the finished plastic part.<\/p>\n<p>In a narrow sense, the parting surface refers specifically to the main separation plane at the largest contour of the part \u2014 the surface that divides cavity from core. In a broader sense, it includes all contact surfaces between mold modules: slider faces, lifter interfaces, insert joints, and ejector pin seats. Every one of these interfaces can leave a visible line on the part.<\/p>\n<p>Industry professionals often call it the \u201cPL surface\u201d or \u201cPL line\u201d for short. The thickness and visibility of this line depend on mold precision, clamping force, material viscosity, and processing conditions. A well-designed parting surface with tight mold tolerances produces a line so fine it\u2019s barely visible \u2014 typically 0.01 to 0.05 mm wide. A poorly designed one produces visible flash, mismatch, or step marks that require secondary trimming operations.<\/p>\n<h2>How Is the Parting Line Formed During Molding?<\/h2>\n<p>Ay\u0131rma \u00e7izgisi, iki kal\u0131p yar\u0131s\u0131 kapatma kuvveti alt\u0131nda bir araya geldi\u011finde olu\u015fur ve bitmi\u015f par\u00e7a \u00fczerinde fiziksel bir diki\u015f olu\u015fturur. Bir <a href=\"https:\/\/zetarmold.com\/tr\/injection-mold-complete-guide\/\">enjeksiyon kal\u0131b\u0131<\/a> consists of at least two halves \u2014 a fixed half mounted to the stationary platen and a moving half mounted to the moving platen. When the molding machine closes the mold, the two halves meet at the parting surface.<\/p>\n<p>During injection, molten plastic fills the cavity under high pressure (typically 500\u20132,000 bar). Some of this pressure acts directly on the parting surface. Even with precision-ground mold faces, a microscopic gap exists between the halves. If the injection pressure exceeds what the clamping force can contain, material forces its way into this gap \u2014 that\u2019s flash.<\/p>\n<p>After cooling and solidification, the mold opens along the parting plane. The part stays on the core side (thanks to shrinkage gripping the core), and the ejector system pushes it free. The seam where the two mold halves met is now permanently recorded on the part surface as the parting line.<\/p>\n<figure style=\"text-align:center;margin:2em 0;\">\n<img decoding=\"async\" width=\"800\" height=\"457\" src=\"https:\/\/zetarmold.com\/wp-content\/uploads\/2025\/12\/plastic-injection-gates-types.webp\" alt=\"Types of plastic injection molding gates\" class=\"wp-image-51740 size-full\" style=\"max-width:100%;height:auto;\" srcset=\"https:\/\/zetarmold.com\/wp-content\/uploads\/2025\/12\/plastic-injection-gates-types.webp 800w, https:\/\/zetarmold.com\/wp-content\/uploads\/2025\/12\/plastic-injection-gates-types-300x171.webp 300w, https:\/\/zetarmold.com\/wp-content\/uploads\/2025\/12\/plastic-injection-gates-types-768x439.webp 768w, https:\/\/zetarmold.com\/wp-content\/uploads\/2025\/12\/plastic-injection-gates-types-18x10.webp 18w, https:\/\/zetarmold.com\/wp-content\/uploads\/2025\/12\/plastic-injection-gates-types-600x343.webp 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption style=\"font-size:0.78em; color:#888; font-style:italic; margin-top:4px; text-align:center;\">Gate type and location work together.<\/figcaption><\/figure>\n<p>In most cases, the parting line runs perpendicular to the mold opening direction. But for complex geometries \u2014 parts with undercuts, side features, or asymmetrical profiles \u2014 the parting surface may include stepped, angled, or curved sections. These multi-directional parting surfaces require additional mold mechanisms like sliders, lifters, or angled pins to function correctly.<\/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\" width=\"20\" height=\"20\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"#16a34a\" stroke-width=\"2\"><path d=\"M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z\"\/><\/svg><b>\u201cA parting line width of 0.01 mm is considered acceptable for most cosmetic parts.\u201d<\/b><span class=\"claim-true-or-false\">Do\u011fru<\/span><\/p>\n<p class=\"claim-explanation\">For visible\/cosmetic surfaces, parting lines under 0.05 mm are generally acceptable. High-precision molds can achieve 0.01 mm or less, which is nearly invisible to the naked eye.<\/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\" width=\"20\" height=\"20\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"#dc2626\" stroke-width=\"2\"><line x1=\"18\" y1=\"6\" x2=\"6\" y2=\"18\"\/><line x1=\"6\" y1=\"6\" x2=\"18\" y2=\"18\"\/><\/svg><b>\u201cThe parting line is a defect caused by poor mold manufacturing.\u201d<\/b><span class=\"claim-true-or-false\">Yanl\u0131\u015f<\/span><\/p>\n<p class=\"claim-explanation\">The parting line is an unavoidable feature of any two-part mold. It exists on every injection molded part regardless of mold quality. What varies is the line\u2019s visibility \u2014 a precision mold produces a barely perceptible line, while a worn or poorly designed mold produces visible flash.<\/p>\n<\/div>\n<h2>What Are the Types of Parting Surfaces?<\/h2>\n<p>Be\u015f t\u00fcr ay\u0131rma y\u00fczeyi d\u00fcz, basamakl\u0131, a\u00e7\u0131l\u0131, kavisli ve kompozittir. Do\u011fru t\u00fcr\u00fc se\u00e7mek, kal\u0131p tasar\u0131m\u0131nda ilk ve en \u00f6nemli kararlardan biridir. \u0130\u015fte be\u015f ana kategori:<\/p>\n<h3>Flat (Straight) Parting Surface<\/h3>\n<p>The simplest and most common type. The parting surface is a single flat plane perpendicular to the mold opening direction. This works well for cup-shaped parts, flat panels, and any geometry where the largest cross-section is a clean horizontal plane. Flat parting surfaces are the easiest to machine, seal, and maintain \u2014 which translates directly to lower mold cost and more consistent part quality.<\/p>\n<h3>Stepped Parting Surface<\/h3>\n<p>When a part has features at different heights that cannot be accommodated by a single flat plane, the parting surface steps up or down to follow the part contour. Stepped parting surfaces create lateral forces during injection that the mold must resist \u2014 typically using interlocking features or wedge-shaped inserts. If the step height is excessive, designers add cushion pads to partially flatten the surface while maintaining necessary clearance.<\/p>\n<h3>Angled (Inclined) Parting Surface<\/h3>\n<p>For parts with angled features or asymmetrical profiles, the parting surface follows an inclined plane. The angled surface includes a sealing section along the slope (to contain the plastic) and a flat reference section (for machining, alignment, and measurement). This type requires careful attention to lateral force management \u2014 the injection pressure creates a sideways thrust that must be balanced.<\/p>\n<h3>Curved (Contoured) Parting Surface<\/h3>\n<p>Complex consumer products \u2014 think power tool housings, automotive interior trim, or medical device enclosures \u2014 often need parting surfaces that follow curved part contours. The mold face is CNC-machined to match the 3D profile. Curved parting surfaces demand high machining precision and careful sealing surface design to prevent flash along the entire contour.<\/p>\n<h3>Composite (Combined) Parting Surface<\/h3>\n<p>Many real-world parts combine two or more of the above types. A single mold might have a flat section in one area, a step in another, and a curved section elsewhere. Composite parting surfaces require extra attention at the transition zones \u2014 sharp corners at the junction between different surface types must be smoothed to avoid weak mold steel and to prevent flash.<\/p>\n<h2>What Are the Key Parting Surface Design Principles?<\/h2>\n<p>Good parting surface design is governed by a set of practical principles that balance part quality, mold cost, and production reliability. In our 20+ years of mold making, these are the rules that separate a smooth production run from weeks of mold modifications.<\/p>\n<h3>Principle 1: Ensure Proper Demolding<\/h3>\n<p>The main parting surface should be located at the largest cross-section of the part in the mold opening direction. This is the fundamental rule. Placing the parting line anywhere else means you\u2019ll need side actions (sliders, lifters) to release the part \u2014 adding cost, complexity, and maintenance points to the mold. Every additional side action is another potential source of flash, wear, and downtime.<\/p>\n<h3>Principle 2: Keep the Part on the Correct Side<\/h3>\n<p>Since the ejection system is on the moving mold half (B-side), the parting surface should be designed so the part stays on the core after the mold opens. If the part sticks to the cavity (A-side), you\u2019ll need a dedicated ejection mechanism on the fixed half \u2014 adding cost and complexity. Draft angles on the core side and undercut features help ensure reliable part retention.<\/p>\n<h3>Principle 3: Preserve Dimensional Accuracy<\/h3>\n<p>Any dimension that crosses the parting line is subject to variation from mold alignment, clamping deflection, and flash formation. For critical dimensions \u2014 especially those requiring tight coaxiality or positional tolerance \u2014 place all related features on the same side of the mold. A stepped hole that requires \u00b10.02 mm coaxiality should be formed by a single core on one mold half, not split across both.<\/p>\n<h3>Principle 4: Optimize Venting<\/h3>\n<p>Sertle\u015ftirilmi\u015f tak\u0131m \u00e7eli\u011fi (HRC 48\u201352) kullan\u0131larak hassas i\u015flenmi\u015f bir kal\u0131pla, ay\u0131rma \u00e7izgileri 0,005\u20130,01 mm geni\u015fli\u011fe kadar d\u00fc\u015f\u00fcr\u00fclebilir \u2014 bu neredeyse \u00e7\u0131plak g\u00f6zle g\u00f6r\u00fclemez ve dokunuldu\u011funda fark edilmez. Standart \u00fcretim kal\u0131plar\u0131 tipik olarak 0,02\u20130,05 mm \u00e7izgiler \u00fcretir; bunlar g\u00f6r\u00fcn\u00fcr olsa da \u00e7o\u011fu kozmetik olmayan uygulama i\u00e7in kabul edilebilir. Elde edilebilen incelik birka\u00e7 fakt\u00f6re ba\u011fl\u0131d\u0131r: kal\u0131p i\u015fleme hassasiyeti (y\u00fczey ta\u015flama vs. frezeleme), \u00e7elik sertli\u011fi ve a\u015f\u0131nma direnci, s\u0131k\u0131\u015ft\u0131rma kuvveti yeterlili\u011fi, enjeksiyon bas\u0131n\u00e7 profili ve kal\u0131plama malzemesinin eriyik viskozitesi. Daha y\u00fcksek hassasiyetli kal\u0131plar daha pahal\u0131d\u0131r ancak uzun \u00fcretim serileri boyunca s\u00fcrekli daha ince ay\u0131rma \u00e7izgileri sa\u011flar.<\/p>\n<h3>Principle 5: Simplify Mold Construction<\/h3>\n<p>Every additional complexity in the parting surface adds machining time, inspection cost, and maintenance risk. If the part geometry allows it, a flat parting surface is always preferable. When complexity is unavoidable \u2014 like stepped or curved surfaces \u2014 try to combine multiple features into shared surfaces to reduce the total number of parting transitions.<\/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\" width=\"20\" height=\"20\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"#16a34a\" stroke-width=\"2\"><path d=\"M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z\"\/><\/svg><b>\u201cDimensions that cross the parting line have more variation than dimensions on one mold half.\u201d<\/b><span class=\"claim-true-or-false\">Do\u011fru<\/span><\/p>\n<p class=\"claim-explanation\">Any dimension spanning both mold halves is affected by mold alignment accuracy, clamping force consistency, thermal expansion differences, and flash thickness. Holding tight tolerances (\u00b10.05 mm or better) across the parting line is significantly harder than on a single mold half.<\/p>\n<\/div>\n<figure style=\"text-align:center;margin:2em 0;\">\n<img decoding=\"async\" width=\"800\" height=\"457\" src=\"https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/04\/injection-mold-design-parting-lines.webp\" alt=\"Ay\u0131rma \u00e7izgilerini g\u00f6steren enjeksiyon kal\u0131p tasar\u0131m\u0131\" class=\"wp-image-53480 size-full\" style=\"max-width:100%;height:auto;\" srcset=\"https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/04\/injection-mold-design-parting-lines.webp 800w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/04\/injection-mold-design-parting-lines-300x171.webp 300w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/04\/injection-mold-design-parting-lines-768x439.webp 768w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/04\/injection-mold-design-parting-lines-18x10.webp 18w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/04\/injection-mold-design-parting-lines-600x343.webp 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption style=\"font-size:0.78em; color:#888; font-style:italic; margin-top:4px; text-align:center;\">Enjeksiyon kal\u0131b\u0131nda ay\u0131rma \u00e7izgisi<\/figcaption><\/figure>\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\" width=\"20\" height=\"20\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"#dc2626\" stroke-width=\"2\"><line x1=\"18\" y1=\"6\" x2=\"6\" y2=\"18\"\/><line x1=\"6\" y1=\"6\" x2=\"18\" y2=\"18\"\/><\/svg><b>\u201cA stepped parting surface always requires side-core pulling mechanisms.\u201d<\/b><span class=\"claim-true-or-false\">Yanl\u0131\u015f<\/span><\/p>\n<p class=\"claim-explanation\">Stepped parting surfaces follow height changes in the part geometry but still open in the main mold direction. Side-core pulling (sliders) is needed for undercuts \u2014 features that are perpendicular to the mold opening direction. A step can exist without any undercut.<\/p>\n<\/div>\n<h2>How Does Parting Line Placement Affect Part Quality?<\/h2>\n<p>The parting line location is arguably the single most impactful decision in mold design. It directly affects four quality dimensions: appearance, dimensional accuracy, surface finish, and tooling longevity.<\/p>\n<p><strong>Appearance:<\/strong> On cosmetic surfaces, the parting line is a visible seam. For consumer products, this means the parting line must be hidden in a non-visible area, disguised along a feature edge, or finished to near-invisibility. If your part has a visible Class A surface, the parting line needs to be on the back or along a natural break line. We\u2019ve worked with automotive clients who rejected entire production batches because the parting line shifted 0.2 mm from the agreed position.<\/p>\n<p><strong>Dimensional accuracy:<\/strong> As discussed above, cross-parting-line dimensions inherit the alignment tolerance of the mold. For parts with \u00b10.1 mm general tolerances, this is usually manageable. For precision components with \u00b10.02 mm requirements, you need to avoid splitting critical features across the parting line entirely.<\/p>\n<p><strong>Y\u00fczey kaplamas\u0131:<\/strong> The parting line area typically has a different surface texture than the rest of the part. Even with polished molds, the junction where the two halves meet creates a slight step or witness line. If the part requires a specific SPI finish (like SPI A-2 for lens-quality surfaces), the parting line area will never match the surrounding finish perfectly.<\/p>\n<p><strong>Tooling longevity:<\/strong> Parting surfaces bear the full brunt of clamping force cycle after cycle. A well-designed parting surface with proper support and sufficient bearing area will last hundreds of thousands of shots. A poorly designed one \u2014 with sharp edges, insufficient sealing area, or excessive overhang \u2014 will wear, dinge, and develop flash within tens of thousands of cycles.<\/p>\n<h2>When Should You Use Stepped or Curved Parting Surfaces?<\/h2>\n<p>Basamakl\u0131 ay\u0131rma y\u00fczeyleri, bir par\u00e7an\u0131n farkl\u0131 y\u00fcksekliklerde \u00f6zellikleri oldu\u011funda ve d\u00fczlemsel olmayan geometriler i\u00e7in kavisli y\u00fczeylere ihtiya\u00e7 duyuldu\u011funda kullan\u0131l\u0131r. \u0130\u015fte her t\u00fcr\u00fcn ne zaman kullan\u0131laca\u011f\u0131 ve hangi \u00f6d\u00fcnleri kabul etti\u011finiz.<\/p>\n<p><strong>Use a stepped parting surface when:<\/strong> The part has features at significantly different heights that cannot be demolded with a single flat plane. Electronics housings with connector cutouts at different heights, enclosure halves with stepped mounting bosses, and pump components with multiple sealing levels are typical candidates. The key engineering concern with stepped surfaces is managing lateral injection forces \u2014 the melt pressure pushes sideways on the step, and without proper interlocks or wedge supports, the mold halves can shift, causing dimensional drift and flash.<\/p>\n<p><strong>Use a curved parting surface when:<\/strong> The part has organic, non-planar geometry \u2014 think consumer product housings, automotive trim, or ergonomic grips. The parting surface follows the 3D contour of the part to hide the line along a natural edge or feature boundary. This approach produces the best cosmetic results but demands high-precision CNC machining and careful mold texturing to ensure the surface finish is consistent across the curved interface.<\/p>\n<p><strong>Trade-off analysis:<\/strong> Going from flat to stepped to curved parting surfaces, each step roughly adds 15\u201330% to mold construction cost. Stepped surfaces require additional interlock machining and potentially larger mold bases. Curved surfaces demand 5-axis CNC work and extended fitting time. The production penalty is real too \u2014 complex parting surfaces wear faster, need more frequent maintenance, and are more sensitive to process parameter drift.<\/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\" width=\"20\" height=\"20\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"#16a34a\" stroke-width=\"2\"><path d=\"M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z\"\/><\/svg><b>\u201cCurved parting surfaces are always more expensive to manufacture than flat ones.\u201d<\/b><span class=\"claim-true-or-false\">Do\u011fru<\/span><\/p>\n<p class=\"claim-explanation\">Curved parting surfaces require 5-axis CNC machining, extended fitting\/spotting time, and more complex inspection. A flat parting surface can be surface-ground to tolerance quickly, while a curved one must be machined and hand-fitted along the entire contour. The cost premium is typically 20\u201340% over a comparable flat design.<\/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\" width=\"20\" height=\"20\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"#dc2626\" stroke-width=\"2\"><line x1=\"18\" y1=\"6\" x2=\"6\" y2=\"18\"\/><line x1=\"6\" y1=\"6\" x2=\"18\" y2=\"18\"\/><\/svg><b>\u201cYou can eliminate the parting line entirely by using insert molding.\u201d<\/b><span class=\"claim-true-or-false\">Yanl\u0131\u015f<\/span><\/p>\n<p class=\"claim-explanation\">Insert molding still uses a two-part mold and therefore still produces a parting line. The insert is placed in the mold before injection, but the mold still opens and closes along a parting surface. The only way to avoid a parting line is to use a process without a split mold, such as machining from solid stock.<\/p>\n<\/div>\n<h2>How Can DFM Analysis Optimize Your Parting Line?<\/h2>\n<p>Design for Manufacturing (<a href=\"https:\/\/www.iso.org\/standard\/72712.html\">DFM<\/a><sup id=\"fnref1:3\"><a href=\"#fn:3\" class=\"footnote-ref\">3<\/a><\/sup>) analizi, herhangi bir \u00e7elik kesilmeden \u00f6nce ay\u0131rma \u00e7izgisini do\u011fru yapmak i\u00e7in en iyi arac\u0131n\u0131zd\u0131r. Fabrikam\u0131z\u0131n DFM i\u015f ak\u0131\u015f\u0131nda, ay\u0131rma karar\u0131n\u0131 enjeksiyon kal\u0131plaman\u0131n ad\u0131mlar\u0131na kar\u015f\u0131 e\u015fle\u015ftiririz, b\u00f6ylece b\u00f6lme \u00e7izgisi dolumu, paketlemeyi, so\u011futmay\u0131, \u00e7\u0131karmay\u0131 ve muayeneyi destekler. Kapsaml\u0131 bir DFM incelemesi, par\u00e7a geometrisini de\u011ferlendirir, optimal ay\u0131rma \u00e7izgisi konumunu belirler, potansiyel kal\u0131ptan \u00e7\u0131karma sorunlar\u0131n\u0131 i\u015faretler ve gereken kal\u0131p karma\u015f\u0131kl\u0131\u011f\u0131n\u0131 tahmin eder.<\/p>\n<p>ZetarMold'da, 8 k\u0131demli m\u00fchendisimizin her biri her DFM incelemesine 10+ y\u0131ll\u0131k kal\u0131p tasar\u0131m deneyimi getirir. Kal\u0131p denemelerimizde, proses m\u00fchendislerimiz ayr\u0131ca ay\u0131rma \u00e7izgisi ta\u015fmas\u0131n\u0131 vidal\u0131 enjeksiyon kal\u0131plama makinesinden gelen eriyik tutarl\u0131l\u0131\u011f\u0131 ile kar\u015f\u0131la\u015ft\u0131r\u0131r, \u00e7\u00fcnk\u00fc karars\u0131z bir eriyik cephesi marjinal bir ay\u0131rma y\u00fczeyini ger\u00e7ekte oldu\u011fundan daha k\u00f6t\u00fc g\u00f6sterebilir. \u0130\u015fte do\u011fru bir ay\u0131rma \u00e7izgisi DFM analizinin kapsad\u0131klar\u0131:<\/p>\n<p><strong>1. Undercut identification:<\/strong> Every undercut feature is catalogued. For each one, we determine whether it needs a slider, lifter, collapsible core, or can be resolved by simply relocating the parting line. In many cases, a slight redesign of the undercut feature eliminates the need for a side action entirely \u2014 saving significant tooling cost.<\/p>\n<p><strong>2. Draft angle verification:<\/strong> All surfaces perpendicular to the parting line need adequate draft \u2014 typically 1\u20133\u00b0 depending on material and surface finish. Zero-draft or negative-draft walls near the parting line will cause sticking, scoring, or ejection failures.<\/p>\n<p><strong>3. Flash risk assessment:<\/strong> We evaluate which areas of the parting surface will see the highest melt pressure and whether the mold has sufficient bearing area to contain it. Thin-wall sections near the parting line are high-risk zones for flash.<\/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 \/>\u015eangay fabrikam\u0131zda, 90T ila 1850T aras\u0131nda de\u011fi\u015fen 47 enjeksiyon kal\u0131plama makinesi i\u015fletiyoruz ve bunlar dahili bir kal\u0131p \u00fcretim tesisi taraf\u0131ndan destekleniyor. \u00dcretti\u011fimiz her kal\u0131p, titiz bir ayr\u0131m \u00e7izgisi do\u011frulamas\u0131ndan ge\u00e7er - \u00e7\u00fcnk\u00fc 0.05 mm'lik bir uyumsuzluk bile nihai par\u00e7ada g\u00f6r\u00fcn\u00fcr ta\u015fmaya neden olabilir.<\/div>\n<figure style=\"text-align:center;margin:2em 0;\">\n<img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"457\" src=\"https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/02\/injection-vs-overmolding-diagram.webp\" alt=\"Injection Molding vs Overmolding Diagram\" class=\"wp-image-52126 size-full\" style=\"max-width:100%;height:auto;\" srcset=\"https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/02\/injection-vs-overmolding-diagram.webp 800w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/02\/injection-vs-overmolding-diagram-300x171.webp 300w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/02\/injection-vs-overmolding-diagram-768x439.webp 768w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/02\/injection-vs-overmolding-diagram-18x10.webp 18w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/02\/injection-vs-overmolding-diagram-600x343.webp 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption style=\"font-size:0.78em; color:#888; font-style:italic; margin-top:4px; text-align:center;\">Multi-material processes like overmolding add additional.<\/figcaption><\/figure>\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\" width=\"20\" height=\"20\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"#16a34a\" stroke-width=\"2\"><path d=\"M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z\"\/><\/svg><b>\u201cNylon (PA) requires tighter parting line tolerances than polycarbonate (PC) due to its lower melt viscosity.\u201d<\/b><span class=\"claim-true-or-false\">Do\u011fru<\/span><\/p>\n<p class=\"claim-explanation\">Nylon has a much lower melt viscosity than polycarbonate, meaning it flows more easily into microscopic gaps at the parting surface. This makes nylon parts more prone to flash, requiring tighter mold fits (typically 0.02 mm or less) compared to polycarbonate (0.05 mm or less).<\/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\" width=\"20\" height=\"20\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"#dc2626\" stroke-width=\"2\"><line x1=\"18\" y1=\"6\" x2=\"6\" y2=\"18\"\/><line x1=\"6\" y1=\"6\" x2=\"18\" y2=\"18\"\/><\/svg><b>\u201cA DFM analysis is only necessary for complex or high-volume parts.\u201d<\/b><span class=\"claim-true-or-false\">Yanl\u0131\u015f<\/span><\/p>\n<p class=\"claim-explanation\">DFM analysis is valuable for every injection molded part, regardless of complexity or volume. Even simple parts can have parting line issues that are cheap to fix in the design stage but expensive to correct after the mold is built. A 30-minute DFM review can save thousands in mold modifications.<\/p>\n<\/div>\n<h2>S\u0131k\u00e7a Sorulan Sorular<\/h2>\n<h3>What causes visible flash along the parting line?<\/h3>\n<p>Flash forms when molten plastic escapes through the gap between mold halves at the parting surface during the injection phase. Common causes include insufficient clamping force relative to injection pressure, worn or damaged mold faces that no longer seal tightly, poor mold alignment causing uneven bearing pressure, excessive packing pressure held too long, and low-viscosity materials like nylon that flow easily into small gaps. Regular mold maintenance \u2014 including re-spotting parting surfaces every 50,000\u2013100,000 shots \u2014 combined with proper process parameter control and adequate machine tonnage are the primary defenses against flash at the parting line.<\/p>\n<h3>Can a parting line be completely eliminated from an injection molded part?<\/h3>\n<p>No, it cannot. Every injection molded part produced with a conventional two-part mold will always have a parting line where the cavity and core halves meet. The goal is not elimination but minimization \u2014 through precision mold construction with ground parting surfaces, strategic parting line placement on non-cosmetic surfaces, and optimized processing parameters. For applications where any visible seam is unacceptable, alternative manufacturing processes like CNC machining from solid stock or additive manufacturing can produce seamless parts, though at significantly higher per-part cost and lower production throughput.<\/p>\n<h3>How thin can a parting line be made?<\/h3>\n<p>With a precision-ground mold using hardened tool steel (HRC 48\u201352), parting lines can be reduced to 0.005\u20130.01 mm width \u2014 virtually invisible to the naked eye and undetectable by touch. Standard production molds typically produce lines of 0.02\u20130.05 mm, which are visible but acceptable for most non-cosmetic applications. The achievable thinness depends on several factors: mold machining accuracy (surface grinding vs. milling), steel hardness and wear resistance, clamping force adequacy, injection pressure profile, and the melt viscosity of the molding material. Higher-precision molds cost more but deliver consistently finer parting lines over longer production runs.<\/p>\n<h3>Enjeksiyon Kal\u0131p Ay\u0131rma Y\u00fczeyleri ve \u00c7izgileri Rehberi | ZetarMold<\/h3>\n<p>The parting surface is the entire mating interface between the two mold halves \u2014 it is a 2D or 3D surface within the mold tool itself. The parting line is the narrow 1D trace that this interface leaves on the surface of the molded plastic part after ejection. In other words, the parting surface is a mold design feature that exists in the tool steel, while the parting line is the visible evidence of that surface transferred to the finished part. A single parting surface can produce a complex, winding parting line if the mold geometry includes stepped, angled, or curved sections.<\/p>\n<h3>Does parting line location affect injection molding cost?<\/h3>\n<p>Yes, significantly. A simple flat parting surface is the most economical to tool, machine, and maintain. Each increase in complexity \u2014 stepping the surface, adding curves, or introducing additional parting interfaces \u2014 adds machining time, fitting labor, inspection requirements, and long-term maintenance cost. Moving from a flat to a composite parting surface typically increases mold cost by 30\u201350%. Parting lines that require side actions such as sliders, lifters, or angled pins add even more cost, as each side action requires its own guide system, wear plate, and return mechanism, plus additional fitting and testing during mold commissioning.<\/p>\n<h3>What draft angle is needed near the parting line?<\/h3>\n<p>A minimum of 1\u00b0 draft per side is recommended for all surfaces perpendicular to the parting line in standard production molding. For parts with textured surfaces (such as MT, VDI, or spark-eroded finishes), 1.5\u20133\u00b0 per side is required \u2014 deeper textures need more draft to prevent the texture from scuffing during ejection. Polished or mirror-finish surfaces may get by with as little as 0.5\u00b0 draft. Zero-draft or negative-draft walls near the parting line risk part sticking, surface scoring during ejection, increased ejector pin marks, and cycle-to-cycle dimensional variation. Draft should be specified during part design, not discovered as a problem during mold tryout.<\/p>\n<h3>How does clamping force relate to parting line quality?<\/h3>\n<p>The molding machine\u2019s clamping force must exceed the total separating force generated by injection pressure acting on the projected area of the parting surface. If clamping force is insufficient, the mold opens slightly during the injection and packing phases, creating a gap that allows plastic to escape as flash along the parting line. The required clamping force is calculated as: injection pressure \u00d7 projected cavity area \u00d7 safety factor (typically 1.1\u20131.2). Running a mold on an undersized machine is the single most common cause of flash at the parting line in production environments. Selecting the right machine tonnage during production planning is essential for consistent parting line quality.<\/p>\n<p>ZetarMold'daki m\u00fchendislik ekibimiz, her projeye 20+ y\u0131ll\u0131k kal\u0131p tasar\u0131m deneyimi, 8 k\u0131demli m\u00fchendis ve dahili bir kal\u0131p \u00fcretim tesisi getirir. T\u00dcA analizinden \u00fcretime kadar, ayr\u0131m \u00e7izginizi kalite, maliyet ve performans i\u00e7in optimize ederiz. 47 enjeksiyon kal\u0131plama makinesi (90T-1850T) ve 400+ plastik malzeme ile hassas optik bile\u015fenlerden b\u00fcy\u00fck yap\u0131sal par\u00e7alara kadar her \u015feyi hallederiz.<\/p>\n<p>Request a Free Quote \u2192<\/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>ay\u0131rma \u00e7izgisi<\/strong>: ay\u0131rma \u00e7izgisi, enjeksiyon kal\u0131plama i\u015flemi s\u0131ras\u0131nda kal\u0131b\u0131n iki yar\u0131s\u0131n\u0131n bulu\u015ftu\u011fu, kal\u0131planm\u0131\u015f bir par\u00e7a \u00fczerindeki g\u00f6r\u00fcn\u00fcr \u00e7izgiyi ifade eder. <a href=\"#fnref1:1\" class=\"footnote-backref\">\u21a9<\/a><\/p>\n<\/li>\n<li id=\"fn:2\">\n<p><strong>fla\u015f<\/strong>: ta\u015fma, enjeksiyon s\u0131ras\u0131nda ay\u0131rma \u00e7izgisinde kal\u0131p bo\u015flu\u011fundan ka\u00e7an ve ince, istenmeyen kenarlar olu\u015fturan fazla malzemeye i\u015faret eder. <a href=\"#fnref1:2\" class=\"footnote-backref\">\u21a9<\/a><\/p>\n<\/li>\n<li id=\"fn:3\">\n<p><strong>DFM<\/strong>: DFM, \u00dcretim i\u00e7in Tasar\u0131m anlam\u0131na gelir \u2014 par\u00e7alar\u0131n \u00fcretimi daha kolay ve daha uygun maliyetli olacak \u015fekilde tasarlanmas\u0131 uygulamas\u0131d\u0131r. <a href=\"#fnref1:3\" class=\"footnote-backref\">\u21a9<\/a><\/p>\n<\/li>\n<\/ol>","protected":false},"excerpt":{"rendered":"<p>Her enjeksiyon kal\u0131pl\u0131 par\u00e7ada bir tane vard\u0131r \u2014 kal\u0131p yar\u0131lar\u0131n\u0131n birle\u015fti\u011fi y\u00fczey boyunca uzanan ince \u00e7izgi. Ay\u0131rma \u00e7izgisi1 bir kusur de\u011fildir; enjeksiyon kal\u0131plama s\u00fcrecinin ka\u00e7\u0131n\u0131lmaz bir \u00f6zelli\u011fidir. Ancak onu nereye koydu\u011funuz ve etraf\u0131nda nas\u0131l tasar\u0131m yapt\u0131\u011f\u0131n\u0131z, \u00fcretime haz\u0131r bir par\u00e7a [\u2026]<\/p>","protected":false},"author":1,"featured_media":34861,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_seopress_robots_primary_cat":"none","_seopress_titles_title":"Injection Molding Parting Surfaces & Lines Guide | ZetarMold","_seopress_titles_desc":"Master injection molding parting surfaces and lines: types, design principles, defect prevention, and DFM tips from ZetarMold.","_seopress_robots_index":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[42],"tags":[100,89,163],"meta_box":{"post-to-quiz_to":[]},"_links":{"self":[{"href":"https:\/\/zetarmold.com\/tr\/wp-json\/wp\/v2\/posts\/34762"}],"collection":[{"href":"https:\/\/zetarmold.com\/tr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/zetarmold.com\/tr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/zetarmold.com\/tr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/zetarmold.com\/tr\/wp-json\/wp\/v2\/comments?post=34762"}],"version-history":[{"count":0,"href":"https:\/\/zetarmold.com\/tr\/wp-json\/wp\/v2\/posts\/34762\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/zetarmold.com\/tr\/wp-json\/wp\/v2\/media\/34861"}],"wp:attachment":[{"href":"https:\/\/zetarmold.com\/tr\/wp-json\/wp\/v2\/media?parent=34762"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/zetarmold.com\/tr\/wp-json\/wp\/v2\/categories?post=34762"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/zetarmold.com\/tr\/wp-json\/wp\/v2\/tags?post=34762"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}