{"id":7795,"date":"2026-04-17T20:00:00","date_gmt":"2026-04-17T12:00:00","guid":{"rendered":"https:\/\/zetarmold.com\/?p=7795"},"modified":"2026-05-12T03:18:01","modified_gmt":"2026-05-11T19:18:01","slug":"tpu-spuitgieten","status":"publish","type":"post","link":"https:\/\/zetarmold.com\/nl\/tpu-spuitgieten\/","title":{"rendered":"TPU Injection Molding: Complete Processing Guide for Engineers"},"content":{"rendered":"<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>Belangrijkste opmerkingen<\/strong><\/p>\n<ul>\n<li>TPU is a flexible, abrasion-resistant thermoplastic elastomer processed at 180\u2013230\u00b0C on standard injection molding machines.<\/li>\n<li>Shore A hardness spans 60A\u201398A, covering everything from soft grips to semi-rigid structural parts.<\/li>\n<li>Pre-drying at 80\u2013100\u00b0C for 2\u20134 hours is mandatory \u2014 moisture above 0.02% causes splay and chain scission.<\/li>\n<li>TPU outperforms TPE in tensile strength (25\u201355 MPa) and abrasion resistance, making it ideal for demanding applications.<\/li>\n<li>Design for TPU requires generous draft angles (2\u20133\u00b0 for soft grades) and gate diameters \u22651.5 mm.<\/li>\n<\/ul>\n<\/div>\n<h2>What Is TPU Injection Molding?<\/h2>\n<p>TPU <a href=\"https:\/\/zetarmold.com\/nl\/injection-molding-complete-guide\/\">spuitgieten<\/a><sup id=\"fnref1:1\"><a href=\"#fn:1\" class=\"footnote-ref\">1<\/a><\/sup> is het proces waarbij gesmolten thermoplastisch polyurethaan in een stalen mal wordt gespoten om flexibele, slijtvaste onderdelen te produceren. Het materiaal combineert rubberachtige elasticiteit met thermoplastische verwerkbaarheid, waardoor het ideaal is voor overmoulding, afdichtingen en slijtonderdelen. Voor een breder overzicht, zie onze <a href=\"https:\/\/zetarmold.com\/nl\/injection-molding-complete-guide\/\">spuitgieten<\/a> gids en het <a href=\"https:\/\/zetarmold.com\/nl\/injection-mold-complete-guide\/\">spuitgietvorm<\/a><sup id=\"fnref1:2\"><a href=\"#fn:2\" class=\"footnote-ref\">2<\/a><\/sup> overzicht.<\/p>\n<p>Voor een bredere visie, onze <a href=\"https:\/\/zetarmold.com\/nl\/injection-molding-complete-guide\/\">injection molding complete guide<\/a> behandelt procesfundamenten, materiaalgedrag en productiebeslissingen.<\/p>\n<p>For broader context, compare this topic with <a href=\"https:\/\/zetarmold.com\/nl\/injection-molding-supplier-sourcing-guide\/\">supplier sourcing guide<\/a>.<\/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 \/>In onze fabriek in Shanghai hebben we 47 spuitgietmachines van 90T tot 1850T, dus behandelen we elke gereedschapsbeslissing als een procesvenstervraag, niet alleen als een gecoteerde prijs.<\/div>\n<p>TPU-spuitgieten is het smelten van thermoplastische polyurethaanpellets en deze in een mal injecteren om flexibele, rubberachtige onderdelen te maken. Het draait op dezelfde machines die worden gebruikt voor ABS, PP of nylon.<\/p>\n<p>In our factory, TPU has become one of the most requested elastomeric materials over the past five years. Customers come to us when they need parts that combine rubber-like flexibility with thermoplastic recyclability \u2014 think cable overmolds, wearable device skins, and industrial seals. The chemistry behind TPU consists of alternating hard segments (from diisocyanate and chain extender) and soft segments (from polyol), which create its signature combination of strength and elasticity at the molecular level.<\/p>\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\/2026\/04\/injection-molding-process-flow-800x457-1.jpg\" alt=\"Injection Molding Process Flowchart\" class=\"wp-image-53261 size-full\" style=\"max-width:100%;height:auto;\" srcset=\"https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/04\/injection-molding-process-flow-800x457-1.jpg 800w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/04\/injection-molding-process-flow-800x457-1-300x171.jpg 300w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/04\/injection-molding-process-flow-800x457-1-768x439.jpg 768w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/04\/injection-molding-process-flow-800x457-1-18x10.jpg 18w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/04\/injection-molding-process-flow-800x457-1-600x343.jpg 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption style=\"font-size:0.78em; color:#888; font-style:italic; margin-top:4px; text-align:center;\">TPU injection molding process flow<\/figcaption><\/figure>\n<p>TPU Spuitgieten: Complete Gids voor Ingenieurs<\/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>\u201c\u201cTPU kan worden gespoten op dezelfde machines die worden gebruikt voor ABS, PP en nylon.\u201d\u201d<\/b><span class=\"claim-true-or-false\">Echt<\/span><\/p>\n<p class=\"claim-explanation\">Standard reciprocating-screw injection molding machines process TPU effectively. The key differences are parameter settings (lower barrel temperatures of 180\u2013230\u00b0C, slower injection speeds) and the mandatory pre-drying step \u2014 not the equipment itself.<\/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>\u201c\u201cJe hebt gespecialiseerde rubberverwerkingsapparatuur nodig om TPU-onderdelen te vormen.\u201d\u201d<\/b><span class=\"claim-true-or-false\">Vals<\/span><\/p>\n<p class=\"claim-explanation\">TPU is a thermoplastic elastomer, not a thermoset rubber. It melts and flows like a thermoplastic, so it can be processed on any standard injection molding machine without special rubber-processing attachments or vulcanization ovens.<\/p>\n<\/div>\n<h2>What Are the Key Material Properties of TPU?<\/h2>\n<p>De belangrijkste eigenschappen van TPU zijn Shore A-hardheid van 60A\u201398A, treksterkte van 25\u201355 MPa en slijtageverlies van 20\u201380 mm3. Deze worden tijdens de synthese vastgesteld via de verhouding harde\/zachte segmenten.<\/p>\n<table style=\"width:100%;border-collapse:collapse;margin:1.5em 0;\">\n<thead>\n<tr>\n<th style=\"border:1px solid #ddd;padding:8px;background:#f5f5f5;\">Eigendom<\/th>\n<th style=\"border:1px solid #ddd;padding:8px;background:#f5f5f5;\">Typical Value<\/th>\n<th style=\"border:1px solid #ddd;padding:8px;background:#f5f5f5;\">Significance<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">Shore Hardness<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">60A\u201398A \/ 40D\u201380D<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Soft grips to semi-rigid housings<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">Treksterkte<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">25\u201355 MPa<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Higher than most TPEs<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">Rek bij breuk<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">300\u2013700%<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Excellent flexibility<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">Operating Temp.<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">\u201340\u00b0C to +100\u00b0C<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Outdoor and refrigerated use<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">Schuurweerstand<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">20\u201380 mm3 DIN-verlies<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Superior to rubbers and TPEs<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">Waterabsorptie<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">0.5\u20132.0% (24 hr)<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Mandatory pre-drying<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Polyester-based TPU grades offer superior oil resistance and abrasion performance, while polyether-based grades excel in hydrolysis resistance and low-temperature flexibility. For marine or humid-environment parts, we always specify polyether TPU. For automotive underhood components exposed to hydraulic fluid, polyester grades perform better.<\/p>\n<p>TPU process parameters are barrel temp 180\u2013230\u00b0C, mold temp 20\u201350\u00b0C, slow injection speed, and 2\u20134 hour pre-drying at 80\u2013100\u00b0C. Moisture below 0.02% is mandatory.<\/p>\n<table style=\"width:100%;border-collapse:collapse;margin:1.5em 0;\">\n<thead>\n<tr>\n<th style=\"border:1px solid #ddd;padding:8px;background:#f5f5f5;\">Parameter<\/th>\n<th style=\"border:1px solid #ddd;padding:8px;background:#f5f5f5;\">Range<\/th>\n<th style=\"border:1px solid #ddd;padding:8px;background:#f5f5f5;\">Opmerkingen<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">Pre-drying Temp.<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">80\u2013100\u00b0C<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">2\u20134 hours; dehumidifying dryer<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">Barrel Temp. (Rear)<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">170\u2013190\u00b0C<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Prevents premature melting<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">Barrel Temp. (Front)<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">190\u2013230\u00b0C<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Avoid exceeding 240\u00b0C<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">Schimmel Temperatuur<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">20\u201350\u00b0C<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Higher = better surface<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">Injectiedruk<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">50\u2013120 MPa<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Softer grades need less<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">Houddruk<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">60\u201380% of peak<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Prevents sink marks<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">Koeltijd<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">15\u201360 seconds<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Temp. Bereik<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">Schroefsnelheid<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">30\u201380 RPM<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Slow prevents shear damage<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>In our experience, TPU\u2019s sensitivity to residence time is one of the trickiest parameters to manage. If TPU sits in the barrel at processing temperature for more than 5\u201310 minutes, it begins to degrade \u2014 you\u2019ll see yellowing and a sharp drop in tensile properties. We always purge the machine between runs and minimize shot-to-cycle intervals during production startup.<\/p>\n<h2>What Are Common Defects in TPU Injection Molding and How Can You Prevent Them?<\/h2>\n<p>The most common TPU defects are splay marks (moisture), mold sticking (high tack), short shots (low pressure), and yellowing (thermal degradation). Each has a specific root cause and a practical fix.<\/p>\n<table style=\"width:100%;border-collapse:collapse;margin:1.5em 0;\">\n<thead>\n<tr>\n<th style=\"border:1px solid #ddd;padding:8px;background:#f5f5f5;\">Defect<\/th>\n<th style=\"border:1px solid #ddd;padding:8px;background:#f5f5f5;\">Root Cause<\/th>\n<th style=\"border:1px solid #ddd;padding:8px;background:#f5f5f5;\">Prevention<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">Splay \/ Silver Streaks<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Moisture in material<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Dry at 90\u00b0C for 3\u20134 hours<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">Part Sticking<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">High elasticity, low draft<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Increase draft to 2\u20133\u00b0<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">Bubbles \/ Voids<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Thermal degradation<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Reduce barrel temp; improve venting<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">Kort schot<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Insufficient fill pressure<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Raise injection pressure 10\u201320%<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">Flash<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Overpacking; worn parting line<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Reduce holding pressure<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">Yellowing<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Excessive temp or residence<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Keep barrel below 240\u00b0C; purge<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>We\u2019ve found that part sticking is the single biggest production bottleneck for soft TPU grades. In one project for a wearable fitness device, we were running Shore 75A TPU with a complex undercut geometry. The fix wasn\u2019t more release agent \u2014 it was increasing the draft angle from 1\u00b0 to 2.5\u00b0 on the sidewalls and redesigning the ejector pin locations. Cycle time dropped from 45 seconds to 28 seconds after the mold modification.<\/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\/11\/injection-molding-defects-guide.webp\" alt=\"Visuele gids voor veelvoorkomende TPU-spuitgietdefecten\" 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;\">Veelvoorkomende TPU-spuitgietdefecten en preventie<\/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>\u201c\u201cTPU moet voor elke productierun gedurende 2\u20134 uur worden gedroogd bij 80\u2013100\u00b0C.\u201d\u201d<\/b><span class=\"claim-true-or-false\">Echt<\/span><\/p>\n<p class=\"claim-explanation\">Pre-drying is non-negotiable. Moisture content above 0.02% causes hydrolytic chain scission during the melt phase, producing splay marks, surface bubbles, and significant reduction in tensile strength.<\/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>\u201c\u201cAls TPU-korrels in een verzegelde zak worden bewaard, hoeven ze niet te worden gedroogd.\u201d\u201d<\/b><span class=\"claim-true-or-false\">Vals<\/span><\/p>\n<p class=\"claim-explanation\">TPU is highly hygroscopic \u2014 it can absorb enough moisture in 30\u201360 minutes of open-air exposure to cause splay marks and chain scission. Pre-drying is mandatory regardless of storage conditions.<\/p>\n<\/div>\n<h2>What Industries Rely on TPU Injection Molded Parts?<\/h2>\n<p>TPU is widely used across automotive, footwear, medical, consumer electronics, and industrial applications. Its combination of flexibility, abrasion resistance, and chemical tolerance makes it the go-to elastomer for demanding environments.<\/p>\n<p><strong>Automobiel:<\/strong> Door seals, gearshift boots, cable grommets, and vibration-damping mounts. Polyester-based TPU grades offer the fuel and oil resistance required for underhood applications. We\u2019ve produced TPU cable harness guides for EV battery packs where dimensional stability at \u201330\u00b0C was a hard requirement.<\/p>\n<p><strong>Footwear:<\/strong> Middenzolen, buitenzolen en teenkappen gebruiken TPU voor uitzonderlijke slijtweerstand (20\u201340 mm3 DIN-verlies) en buigvermoeiingsbestendigheid. Gespoten TPU-buitenzolen weerstaan miljoenen buigcycli zonder te barsten.<\/p>\n<p><strong>Medische hulpmiddelen:<\/strong> Medical-grade TPU formulations are used for surgical tubing, catheter components, and wearable sensor housings. Polyether TPU\u2019s hydrolysis resistance and biocompatibility (ISO 10993) make it suitable for body-contact applications. We produce flexible TPU housings for continuous glucose monitoring devices.<\/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>\u201c\u201cTPU kan kleine ondertrekken opvangen door tijdens het uitnemen te buigen.\u201d\u201d<\/b><span class=\"claim-true-or-false\">Echt<\/span><\/p>\n<p class=\"claim-explanation\">TPU\u2019s elasticity allows it to stretch over minor undercuts without damage, reducing tooling complexity by eliminating sliders or lifters.<\/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>\u201c\u201cTPU-onderdelen zijn te duur voor hoogvolume consumentenproducten.\u201d\u201d<\/b><span class=\"claim-true-or-false\">Vals<\/span><\/p>\n<p class=\"claim-explanation\">TPU costs more per kilogram than commodity TPE, but its longer mold life (300K+ shots), lower scrap rate, and runner recyclability often make it cheaper per-part in volumes above 10,000 units.<\/p>\n<\/div>\n<p><strong>Consumentenelektronica:<\/strong> Phone cases, cable overmolds, earphone tips, and smartwatch bands. TPU\u2019s chemical resistance to sweat, cleaning solvents, and UV light makes it durable in daily consumer environments.<\/p>\n<p><strong>Industrial:<\/strong> Hydraulic hose couplings, conveyor components, roll covers, and protective boots from harder TPU grades (Shore 90A\u201360D). Abrasion and tear resistance exceeds natural rubber by 3\u20135\u00d7 in high-speed conveyor applications.<\/p>\n<h2>How Does TPU Compare to TPE, Silicone, and Rubber?<\/h2>\n<p>TPU is sterker en slijtvaster dan standaard thermoplastische elastomeren (TPE's), met een treksterkte van 25\u201355 MPa versus 8\u201320 MPa voor TPE. Het biedt ook recycleerbaarheid die gevulkaniseerd rubber en LSR niet kunnen evenaren.<\/p>\n<table style=\"width:100%;border-collapse:collapse;margin:1.5em 0;\">\n<thead>\n<tr>\n<th style=\"border:1px solid #ddd;padding:8px;background:#f5f5f5;\">Eigendom<\/th>\n<th style=\"border:1px solid #ddd;padding:8px;background:#f5f5f5;\">TPU<\/th>\n<th style=\"border:1px solid #ddd;padding:8px;background:#f5f5f5;\">TPE<\/th>\n<th style=\"border:1px solid #ddd;padding:8px;background:#f5f5f5;\">Silicone<\/th>\n<th style=\"border:1px solid #ddd;padding:8px;background:#f5f5f5;\">Rubber<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">Treksterkte<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">25\u201355 MPa<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">8\u201320 MPa<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">6\u201312 MPa<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">10\u201330 MPa<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">Abrasion<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Uitstekend<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Goed<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Slecht<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Very Good<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">Temp. Range<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Rode TPU kunststof spuitgietcomponent<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">\u201350 to +80\u00b0C<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">\u201360 to +200\u00b0C<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Rode TPU kunststof spuitgietcomponent<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">Recyclable<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Yes<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Yes<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Geen<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Geen<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">Pre-drying<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Mandatory<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Sometimes<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Geen<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">N\/A<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>We\u2019ve run direct comparison projects for clients choosing between TPU and TPE for phone case applications. TPE (SEBS-based) costs 20\u201330% less per kilogram and processes more easily, but drop test results were consistently 15\u201325% worse with TPE versus a comparable Shore 85A TPU grade. When mechanical performance under repeated impact is critical, TPU wins.<\/p>\n<h2>What Design Guidelines Should You Follow for TPU Parts?<\/h2>\n<p>TPU parts are best designed with 1.5\u20134.0 mm walls, 2\u20133\u00b0 draft for soft grades, gate diameter \u22651.5 mm, and gradual transitions. TPU flexes enough to demold 3\u20135% undercuts without sliders.<\/p>\n<p><strong>Wanddikte:<\/strong> Very thin walls (6 mm) produce long cooling times and potential voids. Uniform wall thickness is especially important with TPU \u2014 sudden changes cause differential shrinkage that creates warpage.<\/p>\n<p><strong>Opzethoeken:<\/strong> This is where we see the most design revisions. Shore 60A\u201375A grades need 2\u20133\u00b0 minimum, and 3\u20135\u00b0 for textured surfaces. TPU grips the mold core during cooling, so generous draft is essential for reliable ejection.<\/p>\n<p><strong>Ondersnijdingen:<\/strong> Unlike rigid plastics, TPU can accommodate minor undercuts (3\u20135% of part diameter) by flexing during demolding. This reduces tooling complexity \u2014 many features that would require sliders in ABS can be directly demolded with TPU.<\/p>\n<p><strong>Poortontwerp:<\/strong> Submarine gates are popular for TPU because they self-degate. Gate diameter must be 1.5\u20132.5 mm minimum \u2014 undersized gates cause excessive shear. Avoid pin gates smaller than 1.0 mm with soft grades.<\/p>\n<table style=\"width:100%;border-collapse:collapse;margin:1.5em 0;\">\n<caption style=\"font-weight:bold;margin-bottom:0.5em;\">Authority checkpoint 1<\/caption>\n<thead>\n<tr>\n<th style=\"border:1px solid #ddd;padding:8px;background:#f5f5f5;\">Checkpoint 1-gebied<\/th>\n<th style=\"border:1px solid #ddd;padding:8px;background:#f5f5f5;\">Checkpoint 1 verificatie<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">Tooling<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Bevestig hoe matrijsoontwerp TPU-spuitgieten be\u00efnvloedt: Complete verwerkingsgids voor ingenieurs.<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">Materiaal<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Check resin behavior, shrinkage, heat, and cosmetic risks.<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:8px;\">Kwaliteit<\/td>\n<td style=\"border:1px solid #ddd;padding:8px;\">Ask for inspection evidence before production approval.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\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-molding-draft-angle-diagram-800x457-1.jpg\" alt=\"Spuitgiet ontwerpschema voor ontwerphoek van TPU-onderdelen\" class=\"wp-image-53346 size-full\" style=\"max-width:100%;height:auto;\" srcset=\"https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/04\/injection-molding-draft-angle-diagram-800x457-1.jpg 800w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/04\/injection-molding-draft-angle-diagram-800x457-1-300x171.jpg 300w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/04\/injection-molding-draft-angle-diagram-800x457-1-768x439.jpg 768w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/04\/injection-molding-draft-angle-diagram-800x457-1-18x10.jpg 18w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/04\/injection-molding-draft-angle-diagram-800x457-1-600x343.jpg 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption style=\"font-size:0.78em; color:#888; font-style:italic; margin-top:4px; text-align:center;\">TPU-onderdeel ontwerp van ontluchthoek<\/figcaption><\/figure>\n<p><strong>Overmolding:<\/strong> TPU is een van de meest veelzijdige materialen voor overmoulding op stijve substraten (ABS, PC, PC\/ABS, nylon). We hebben succesvol Shore 85A TPU overgemouleerd op PC\/ABS behuizingen, met een hechtingsterkte van meer dan 5 MPa in peeltesten. Voor meer informatie over <a href=\"https:\/\/zetarmold.com\/nl\/injection-mold-complete-guide\/\">ontwerp van spuitgietmatrijzen<\/a> design principles, see our complete guide.<\/p>\n<p>Belangrijke controles voor een RFQ zijn het bevestigen van harsgraad, toleranties, cosmetische zones en jaarlijks volume. Gereedschapslevensduur, holtetelling en automatiseringsniveau veranderen ook de eenheidsprijs.<\/p>\n<p>The RFQ should also ask for manufacturing assumptions. Tool steel, cavity count, runner type, surface finish, trial schedule, measurement method, packaging, and change-control expectations all influence final cost and lead time. When these assumptions are explicit, later negotiation becomes faster and safer.<\/p>\n<p>Een sterke, gedetailleerde technische reactie zal altijd ontbrekende invoer identificeren in plaats van onzekerheid te verbergen. Als de leverancier vraagt naar tolerantie-opstapeling, gate-restricties, hars-certificering, kleurmatch of jaarlijkse vraagvariatie, betekent dat meestal dat het engineeringteam het project op productiediepte evalueert in plaats van blind te citeren.<\/p>\n<p>Voor ZetarMold-stijl projecten is het beste resultaat een duidelijke productieweg: DFM-beoordeling, matrijsoontwerpbevestiging, gereedschapsbouw, monstername, inspectie, corrigerende actie en productievrijgave. Die reeks biedt praktische autoriteit en geeft kopers een nuttige checklist voor hun volgende gesprek met een leverancier.<\/p>\n<h2>Welk productiebewijs moet u beoordelen voordat u een TPU-leverancier goedkeurt?<\/h2>\n<p>Belangrijke productiebewijsregistraties zijn gietproeven, dimensionale rapporten en hars-certificaten. Voordat een TPU-leverancier voor productie wordt goedgekeurd, moeten eerstestuksgegevens gemeten waarden voor elke kritieke dimensie vermelden, niet alleen goed\/fout-stempels.<\/p>\n<p>Wanneer een project cosmetische of strakke toleranties omvat <a href=\"https:\/\/zetarmold.com\/nl\/injection-molding-complete-guide\/\">kunststof<\/a><sup id=\"fnref1:3\"><a href=\"#fn:3\" class=\"footnote-ref\">3<\/a><\/sup> onderdelen, het bewijs moet ook de vooraf overeengekomen monsterkeuringsregels bevatten voordat de serieproductie begint. Grensmonsters, meetgereedschappen, kleurstandaarden en defectclassificatieborden moeten worden opgesteld en duidelijk gedocumenteerd v\u00f3\u00f3r de productievrijgave om latere subjectieve acceptatiegeschillen te voorkomen.<\/p>\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\/03\/Overmolding1-800x457-1.jpg\" alt=\"Voorbeeld van TPU-overmoulding op spuitgietonderdeel\" class=\"wp-image-52479 size-full\" style=\"max-width:100%;height:auto;\" srcset=\"https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/Overmolding1-800x457-1.jpg 800w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/Overmolding1-800x457-1-300x171.jpg 300w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/Overmolding1-800x457-1-768x439.jpg 768w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/Overmolding1-800x457-1-18x10.jpg 18w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/Overmolding1-800x457-1-600x343.jpg 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption style=\"font-size:0.78em; color:#888; font-style:italic; margin-top:4px; text-align:center;\">TPU-overmouldingsproces<\/figcaption><\/figure>\n<h2>Veelgestelde vragen over TPU-spuitgieten<\/h2>\n<h3>What is the minimum order quantity for TPU injection molded parts?<\/h3>\n<p>There is no universal minimum \u2014 it depends on tooling amortization. For a simple mold costing $3,000\u20135,000, quantities of 500\u20132,000 parts can be economical. For high-volume TPU parts (100,000+ units\/year), multi-cavity molds with 4\u20138 cavities are standard.<\/p>\n<h3>Can I use recycled TPU (rTPU) for injection molding?<\/h3>\n<p>Yes, but with limitations. Recycled TPU typically has 10\u201320% lower tensile strength and reduced elongation. For non-structural applications, rTPU works well. For load-bearing parts, mixing 10\u201320% rTPU with virgin resin is a common compromise.<\/p>\n<h3>How long does a TPU injection mold typically last?<\/h3>\n<p>A production-grade P20 steel mold for TPU typically lasts 300,000\u2013500,000 shots. TPU is gentler on mold steel than abrasive-filled materials, so mold life is primarily driven by shot count.<\/p>\n<h3>Why does my TPU part turn yellow after molding?<\/h3>\n<p>Yellowing is almost always caused by thermal degradation \u2014 barrel temperature too high (above 240\u00b0C), excessive residence time, or moisture-induced hydrolysis. Check your barrel temperature profile first and purge the machine before production.<\/p>\n<h3>What is the typical shrinkage rate for TPU?<\/h3>\n<p>TPU shrinkage ranges from 0.8\u20132.0% depending on hardness. Softer grades (Shore 60A\u201375A) shrink 1.5\u20132.0%, while harder grades (Shore 90A\u201360D) shrink 0.8\u20131.2%. Always consult the material datasheet and run test shots before finalizing mold dimensions.<\/p>\n<h3>Is TPU safe for food contact applications?<\/h3>\n<p>Some TPU grades are FDA-compliant for food contact under 21 CFR regulations, but the specific grade must be verified. Not all formulations are food-safe \u2014 colorants and additives may disqualify a grade.<\/p>\n<h3>What is the difference between polyester and polyether TPU?<\/h3>\n<p>Polyester TPU offers better oil resistance and abrasion performance; polyether TPU provides superior hydrolysis resistance and low-temperature flexibility. For marine or humid environments, specify polyether. For automotive underhood applications, choose polyester.<\/p>\n<h2>Get Expert TPU Injection Molding Support<\/h2>\n<p>De grootste kostenfactor bij TPU-spuitgieten is niet de materiaalprijs \u2014 het is het in \u00e9\u00e9n keer goed krijgen van drogen, ontwerphoeken en poortontwerp. In onze 20 jaar ervaring met TPU-gereedschappen bij ZetarMold gebruiken onze 8 senior engineers bij elk TPU-project moldflow-simulatie voordat staal wordt gesneden, waardoor vullingsonevenwichtigheden en laslijnrisico's vroegtijdig worden opgespoord.<\/p>\n<p>Met 47 spuitgietmachines (90T\u20131850T), meer dan 400 materiaalopties en ISO 9001\/13485 gecertificeerde kwaliteitssystemen, hebben we de apparatuur en ervaring om TPU-projecten van prototype tot serieproductie te behandelen. Neem contact met ons op om uw TPU-project te bespreken \u2014 ons Engelstalige technische team reageert binnen 24 uur.<\/p>\n<p><script type=\"application\/ld+json\"> { \"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [ { \"@type\": \"Question\", \"name\": \"What is the minimum order quantity for TPU injection molded parts?\", \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"There is no universal minimum \u2014 it depends on tooling amortization. For a simple mold costing $3,000\u20135,000, quantities of 500\u20132,000 parts can be economical. For high-volume TPU parts (100,000+ units\/year), multi-cavity molds with 4\u20138 cavities are standard.\" } }, { \"@type\": \"Question\", \"name\": \"Can I use recycled TPU (rTPU) for injection molding?\", \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"Yes, but with limitations. Recycled TPU typically has 10\u201320% lower tensile strength and reduced elongation.<\/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>spuitgieten<\/strong>: spuitgieten verwijst naar het productieproces dat kunststof smelt, het in een matrijsholte injecteert, het onderdeel afkoelt en de cyclus herhaalt voor stabiele volumeproductie. <a href=\"#fnref1:1\" class=\"footnote-backref\">\u21a9<\/a><\/p>\n<\/li>\n<li id=\"fn:2\">\n<p><strong>spuitgietvorm<\/strong>: injectiematrijs verwijst naar een injectiematrijs is het precisiegereedschap dat onderdeelgeometrie, koelgedrag, ejectie, gating, oppervlakafwerking en reproduceerbaarheid definieert. <a href=\"#fnref1:2\" class=\"footnote-backref\">\u21a9<\/a><\/p>\n<\/li>\n<li id=\"fn:3\">\n<p><strong>kunststof<\/strong>: Plastic is een materiaalfamilie waarvan stroming, krimp, sterkte, hittebestendigheid, cosmetische kwaliteit, cyclustijd en langetermijnprestaties vormgevingsbeslissingen be\u00efnvloeden. <a href=\"#fnref1:3\" class=\"footnote-backref\">\u21a9<\/a><\/p>\n<\/li>\n<\/ol>","protected":false},"excerpt":{"rendered":"<p>Belangrijkste punten TPU is een flexibel, slijtvast thermoplastisch elastomeer dat bij 180\u2013230\u00b0C wordt verwerkt op standaard spuitgietmachines. De Shore A-hardheid varieert van 60A tot 98A, wat alles omvat van zachte grepen tot semi-rigide structurele onderdelen. Vooraf drogen bij 80\u2013100\u00b0C gedurende 2\u20134 uur is verplicht \u2014 vocht boven 0,02% veroorzaakt sproeivlekken en ketensplitsing. TPU overtreft TPE qua treksterkte (25\u201355 [\u2026]<\/p>","protected":false},"author":1,"featured_media":7659,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_seopress_robots_primary_cat":"none","_seopress_titles_title":"TPU Injection Molding: Complete Guide for Engineers","_seopress_titles_desc":"Master TPU injection molding: parameters, drying, defect fixes, mold design, and material selection from 20+ years of production experience.","_seopress_robots_index":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[45],"tags":[88,48,302],"meta_box":{"post-to-quiz_to":[]},"_links":{"self":[{"href":"https:\/\/zetarmold.com\/nl\/wp-json\/wp\/v2\/posts\/7795"}],"collection":[{"href":"https:\/\/zetarmold.com\/nl\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/zetarmold.com\/nl\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/zetarmold.com\/nl\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/zetarmold.com\/nl\/wp-json\/wp\/v2\/comments?post=7795"}],"version-history":[{"count":0,"href":"https:\/\/zetarmold.com\/nl\/wp-json\/wp\/v2\/posts\/7795\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/zetarmold.com\/nl\/wp-json\/wp\/v2\/media\/7659"}],"wp:attachment":[{"href":"https:\/\/zetarmold.com\/nl\/wp-json\/wp\/v2\/media?parent=7795"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/zetarmold.com\/nl\/wp-json\/wp\/v2\/categories?post=7795"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/zetarmold.com\/nl\/wp-json\/wp\/v2\/tags?post=7795"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}