{"id":3134,"date":"2026-08-20T11:23:57","date_gmt":"2026-08-20T03:23:57","guid":{"rendered":"http:\/\/0"},"modified":"2026-08-18T17:29:27","modified_gmt":"2026-08-18T09:29:27","slug":"overmolding-design-guide-for-precision-cad-engineers","status":"publish","type":"post","link":"https:\/\/www.jcinjectionmolding.com\/ja\/blog\/overmolding-design-guide-for-precision-cad-engineers\/","title":{"rendered":"\u7cbe\u5bc6CAD\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u305f\u3081\u306e\u30aa\u30fc\u30d0\u30fc\u30e2\u30fc\u30eb\u30c7\u30a3\u30f3\u30b0\u8a2d\u8a08\u30ac\u30a4\u30c9"},"content":{"rendered":"<article style=\"font-family: -apple-system, BlinkMacSystemFont, &#039;Segoe UI&#039;, Roboto, Helvetica, Arial, sans-serif;color: #333333;width: 100%\">\n<section style=\"margin-bottom: 30px\">\n<p style=\"font-size: 18px;line-height: 1.8em;text-align: left;margin-bottom: 24px\">Designing multi-material polymer components requires balancing wall thickness ratios, shut-off steel angles, and mechanical anchoring features inside the 3D CAD model. Integrating flexible elastomeric layers directly over rigid plastic substrates provides tactile ergonomics, impact protection, and fluidic sealing without secondary mechanical fasteners.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3140\" src=\"https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/engineer-reviewing-overmolding-dfm-rules.webp\" alt=\"engineer-reviewing-overmolding-dfm-rules\" width=\"1376\" height=\"768\" srcset=\"https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/engineer-reviewing-overmolding-dfm-rules.webp 1376w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/engineer-reviewing-overmolding-dfm-rules-300x167.webp 300w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/engineer-reviewing-overmolding-dfm-rules-1024x572.webp 1024w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/engineer-reviewing-overmolding-dfm-rules-768x429.webp 768w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/engineer-reviewing-overmolding-dfm-rules-18x10.webp 18w\" sizes=\"auto, (max-width: 1376px) 100vw, 1376px\" \/><\/p>\n<p style=\"font-size: 18px;line-height: 1.8em;text-align: left;margin-bottom: 24px\">Improper wall transitions or weak perimeter shut-offs trigger severe manufacturing defects like edge peeling, elastomeric flash, and localized sink marks. Establishing standardized DfM guidelines during initial 3D modeling eliminates costly tool modifications and ensures high-yield series production. This technical engineering guide analyzes wall thickness ratios, mechanical undercut geometries, and shut-off land sealing parameters.<\/p>\n<\/section>\n<p><!-- Navigation Menu (\u9876\u90e8\u6a21\u5757\u5bfc\u822a\u680f) --><\/p>\n<nav style=\"background-color: #f8f9fa;border-left: 4px solid #0056b3;padding: 24px;border-radius: 6px;margin: 30px 0\">\n<h3 style=\"font-size: 22px;font-weight: bold;line-height: 1.5em;margin-top: 0;margin-bottom: 16px;color: #111111\">\u76ee\u6b21<\/h3>\n<ul style=\"list-style-type: none;padding-left: 0;margin: 0\">\n<li style=\"margin-bottom: 10px\"><a style=\"color: #0056b3;text-decoration: none;font-size: 17px;font-weight: 500\" href=\"#wall-thickness\">1. Wall Thickness Transitions &amp; Preventing Soft Rubber Sink Marks<\/a><\/li>\n<li style=\"margin-bottom: 10px\"><a style=\"color: #0056b3;text-decoration: none;font-size: 17px;font-weight: 500\" href=\"#mechanical-interlocks\">2. Designing Mechanical Interlocks, Holes, and Undercuts<\/a><\/li>\n<li style=\"margin-bottom: 10px\"><a style=\"color: #0056b3;text-decoration: none;font-size: 17px;font-weight: 500\" href=\"#shut-off-design\">3. Shut-off Land Design to Prevent Elastomer Flash<\/a><\/li>\n<li style=\"margin-bottom: 10px\"><a style=\"color: #0056b3;text-decoration: none;font-size: 17px;font-weight: 500\" href=\"#why-jucheng\">4. Why Choose JUCHENG for Overmolding DfM &amp; Tooling<\/a><\/li>\n<li style=\"margin-bottom: 0\"><a style=\"color: #0056b3;text-decoration: none;font-size: 17px;font-weight: 500\" href=\"#faq\">5. \u3088\u304f\u3042\u308b\u8cea\u554f\uff08FAQ\uff09<\/a><\/li>\n<\/ul>\n<\/nav>\n<p><!-- Section 1 (\u524d\u90e8\uff1a\u76ee\u6807\u8bcd\u52a0\u7c97 1 \u6b21) --><\/p>\n<section id=\"wall-thickness\" style=\"margin-bottom: 50px\">\n<h2 style=\"font-size: 28px;line-height: 1.5em;font-weight: bold;margin-top: 40px;margin-bottom: 24px;color: #111111;border-bottom: 1px solid #eaeaea;padding-bottom: 8px\">Wall Thickness Transitions &amp; Preventing Soft Rubber Sink Marks<\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3139\" src=\"https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/uniform-elastomer-wall-thickness-cross-section.webp\" alt=\"uniform-elastomer-wall-thickness-cross-section\" width=\"1376\" height=\"768\" srcset=\"https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/uniform-elastomer-wall-thickness-cross-section.webp 1376w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/uniform-elastomer-wall-thickness-cross-section-300x167.webp 300w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/uniform-elastomer-wall-thickness-cross-section-1024x572.webp 1024w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/uniform-elastomer-wall-thickness-cross-section-768x429.webp 768w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/uniform-elastomer-wall-thickness-cross-section-18x10.webp 18w\" sizes=\"auto, (max-width: 1376px) 100vw, 1376px\" \/><\/p>\n<p style=\"font-size: 18px;line-height: 1.8em;text-align: left;margin-bottom: 24px\">Adhering to a comprehensive <strong>overmolding design guide<\/strong> ensures that elastomeric layers solidify uniformly without developing cosmetic sink marks or internal voids. Nominal wall thickness for the soft <strong>\u30a8\u30e9\u30b9\u30c8\u30de\u30fc<\/strong> layer should remain between 1.5 mm and 3.0 mm across the component. Designing overmold sections thinner than 1.0 mm creates high injection resistance that leads to short shots in low-viscosity <a href=\"https:\/\/www.jcinjectionmolding.com\/ja\/materials\/thermoplastic-elastomer-tpe\/\"><strong>TPE<\/strong><\/a> \u307e\u305f\u306f <strong>TPU<\/strong> resins.<\/p>\n<p style=\"font-size: 18px;line-height: 1.8em;text-align: left;margin-bottom: 24px\">Conversely, excessively thick elastomer sections cool significantly slower than adjacent substrate walls, pulling surface material inward to create deep sink depressions. Incorporating gradual taper transitions between thick and thin sections prevents localized mass concentrations. Maintaining uniform wall thicknesses across both substrate and overmold layers ensures balanced thermal contraction throughout the cooling cycle.<\/p>\n<p><!-- Table 1: DfM Wall Thickness Guidelines Table --><\/p>\n<div style=\"margin: 32px 0\">\n<table style=\"width: 100%;border-collapse: collapse;font-size: 16px;text-align: left;min-width: 600px\">\n<thead>\n<tr style=\"background-color: #f8f9fa;border-bottom: 2px solid #dee2e6\">\n<th style=\"padding: 16px;border: 1px solid #dee2e6;font-weight: 600;color: #111111\">\u8a2d\u8a08\u30d1\u30e9\u30e1\u30fc\u30bf<\/th>\n<th style=\"padding: 16px;border: 1px solid #dee2e6;font-weight: 600;color: #111111\">\u63a8\u5968CAD\u30ac\u30a4\u30c9\u30e9\u30a4\u30f3<\/th>\n<th style=\"padding: 16px;border: 1px solid #dee2e6;font-weight: 600;color: #111111\">\u9055\u53cd\u3057\u305f\u5834\u5408\u306e\u7269\u7406\u7684\u30ea\u30b9\u30af<\/th>\n<th style=\"padding: 16px;border: 1px solid #dee2e6;font-weight: 600;color: #111111\">\u30c4\u30fc\u30ea\u30f3\u30b0\u6700\u9069\u5316\u6226\u7565<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"border-bottom: 1px solid #dee2e6\">\n<td style=\"padding: 16px;border: 1px solid #dee2e6;color: #333333\">\u30a8\u30e9\u30b9\u30c8\u30de\u30fc\u58c1\u539a<\/td>\n<td style=\"padding: 16px;border: 1px solid #dee2e6;color: #333333\">1.5 mm \u2013 3.0 mm \u5747\u4e00<\/td>\n<td style=\"padding: 16px;border: 1px solid #dee2e6;color: #333333\">\u30d2\u30b1\uff08&gt;3.0mm\uff09\u307e\u305f\u306f\u30b7\u30e7\u30fc\u30c8\u30b7\u30e7\u30c3\u30c8\uff08&lt;1.0mm\uff09<\/td>\n<td style=\"padding: 16px;border: 1px solid #dee2e6;color: #333333\">\u58c1\u6bb5\u5dee\u90e8\u30672:1\u306e\u534a\u5f84\u9077\u79fb\u3092\u7dad\u6301<\/td>\n<\/tr>\n<tr style=\"border-bottom: 1px solid #dee2e6\">\n<td style=\"padding: 16px;border: 1px solid #dee2e6;color: #333333\">\u57fa\u677f\u58c1\u629c\u304d\u30c6\u30fc\u30d1\u89d2<\/td>\n<td style=\"padding: 16px;border: 1px solid #dee2e6;color: #333333\">1.5\u00b0 \u2013 2.0\u00b0 \u6700\u5c0f\u30c6\u30fc\u30d1<\/td>\n<td style=\"padding: 16px;border: 1px solid #dee2e6;color: #333333\">\u90e8\u54c1\u306e\u5f15\u304d\u305a\u308a\u64e6\u308a\u50b7\u3068\u30b3\u30a2\u30d4\u30f3\u56fa\u7740<\/td>\n<td style=\"padding: 16px;border: 1px solid #dee2e6;color: #333333\">\u6df1\u3044\u30b3\u30a2\u5f15\u304d\u629c\u304d\u30ad\u30e3\u30d3\u30c6\u30a3\u306e\u629c\u304d\u30c6\u30fc\u30d1\u3092\u5897\u52a0<\/td>\n<\/tr>\n<tr style=\"border-bottom: 1px solid #dee2e6\">\n<td style=\"padding: 16px;border: 1px solid #dee2e6;color: #333333\">\u5916\u5468\u30a8\u30c3\u30b8\u6bb5\u5dee\u9ad8\u3055<\/td>\n<td style=\"padding: 16px;border: 1px solid #dee2e6;color: #333333\">\u2265 0.5 mm 90\u5ea6\u6bb5\u5dee<\/td>\n<td style=\"padding: 16px;border: 1px solid #dee2e6;color: #333333\">\u30a8\u30e9\u30b9\u30c8\u30de\u30fc\u30a8\u30c3\u30b8\u306e\u30d5\u30a7\u30b6\u30ea\u30f3\u30b0\u3068\u5265\u96e2<\/td>\n<td style=\"padding: 16px;border: 1px solid #dee2e6;color: #333333\">\u660e\u78ba\u306a\u30b7\u30e3\u30c3\u30c8\u30aa\u30d5\u7740\u5ea7\u30b7\u30e7\u30eb\u30c0\u30fc\u306e\u6a5f\u68b0\u52a0\u5de5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/section>\n<p><!-- Section 2 (\u4e2d\u90e8\uff1a\u76ee\u6807\u8bcd\u4e0d\u52a0\u7c97) --><\/p>\n<section id=\"mechanical-interlocks\" style=\"margin-bottom: 50px\">\n<h2 style=\"font-size: 28px;line-height: 1.5em;font-weight: bold;margin-top: 40px;margin-bottom: 24px;color: #111111;border-bottom: 1px solid #eaeaea;padding-bottom: 8px\">Designing Mechanical Interlocks, Holes, and Undercuts<\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3136\" src=\"https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/mechanical-dovetail-interlock-grooves-substrate.webp\" alt=\"mechanical-dovetail-interlock-grooves-substrate\" width=\"1376\" height=\"768\" srcset=\"https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/mechanical-dovetail-interlock-grooves-substrate.webp 1376w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/mechanical-dovetail-interlock-grooves-substrate-300x167.webp 300w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/mechanical-dovetail-interlock-grooves-substrate-1024x572.webp 1024w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/mechanical-dovetail-interlock-grooves-substrate-768x429.webp 768w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/mechanical-dovetail-interlock-grooves-substrate-18x10.webp 18w\" sizes=\"auto, (max-width: 1376px) 100vw, 1376px\" \/><\/p>\n<p style=\"font-size: 18px;line-height: 1.8em;text-align: left;margin-bottom: 24px\">\u30dd\u30ea\u30de\u30fc\u9593\u306e\u5316\u5b66\u7684\u63a5\u7740\u306f\u3001\u90e8\u54c1\u304c\u5f37\u529b\u306a\u6d17\u6d44\u5264\u3001\u6e7f\u6c17\u3001\u307e\u305f\u306f\u52d5\u7684\u306a\u7e70\u308a\u8fd4\u3057\u305b\u3093\u65ad\u529b\u306b\u3055\u3089\u3055\u308c\u308b\u3068\u3001\u6642\u9593\u306e\u7d4c\u904e\u3068\u3068\u3082\u306b\u52a3\u5316\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002 <strong>\u6a5f\u68b0\u7684\u30a4\u30f3\u30bf\u30fc\u30ed\u30c3\u30af<\/strong> \u3092\u525b\u6027\u30d7\u30e9\u30b9\u30c1\u30c3\u30af\u57fa\u677f\u306b\u7d44\u307f\u8fbc\u3080\u3053\u3068\u3067\u3001\u5265\u96e2\u3092\u9632\u3050\u6c38\u7d9a\u7684\u306a\u7269\u7406\u7684\u4fdd\u6301\u304c\u5f97\u3089\u308c\u307e\u3059\u300290\u5ea6\u306e\u30c0\u30d6\u30c6\u30fc\u30eb\u6e9d\u3001\u30a2\u30f3\u30c0\u30fc\u30ab\u30c3\u30c8\u3001\u8cab\u901a\u7a74\u3092\u8a2d\u8a08\u3059\u308b\u3053\u3068\u3067\u3001\u6eb6\u878d\u30a8\u30e9\u30b9\u30c8\u30de\u30fc\u304c\u57fa\u677f\u3092\u901a\u904e\u3057\u3066\u53cd\u5bfe\u5074\u3067\u30ed\u30c3\u30af\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002.<\/p>\n<p style=\"font-size: 18px;line-height: 1.8em;text-align: left;margin-bottom: 24px\">\u30ac\u30e9\u30b9\u5145\u586b\u6750\u5165\u308a\u30a8\u30f3\u30b8\u30cb\u30a2\u30ea\u30f3\u30b0\u30d7\u30e9\u30b9\u30c1\u30c3\u30af\u306a\u3069\u306e\u57fa\u677f\u306f\u3001 <a href=\"https:\/\/www.jcinjectionmolding.com\/ja\/materials\/polyamide-pa-nylon\/\"><strong>PA66<\/strong><\/a> \u307e\u305f\u306f <strong>\u30dd\u30ea\u30ab\u30fc\u30dc\u30cd\u30fc\u30c8\uff08PC\uff09<\/strong> \u6a5f\u68b0\u7684\u30ed\u30c3\u30ad\u30f3\u30b0\u30c1\u30e3\u30cd\u30eb\u304b\u3089\u5927\u304d\u306a\u6069\u6075\u3092\u53d7\u3051\u307e\u3059\u3002\u6a5f\u68b0\u7684\u30a2\u30f3\u30ab\u30fc\u306f\u67d4\u8edf\u306a\u30aa\u30fc\u30d0\u30fc\u30e2\u30fc\u30eb\u30c9\u3092\u6a5f\u68b0\u7684\u306b\u6355\u6349\u3057\u3001\u5927\u304d\u306a\u5f15\u5f35\u529b\u3084\u5265\u96e2\u529b\u304c\u304b\u304b\u3063\u3066\u3082\u7aef\u90e8\u306e\u6d6e\u304d\u4e0a\u304c\u308a\u3092\u30bc\u30ed\u306b\u3057\u307e\u3059\u3002\u3053\u306e\u30aa\u30fc\u30d0\u30fc\u30e2\u30fc\u30eb\u30c9\u8a2d\u8a08\u30ac\u30a4\u30c9\u306b\u5f93\u3046\u3053\u3068\u3067\u3001\u81ea\u52d5\u8eca\u3084\u533b\u7642\u306e\u9577\u671f\u30e9\u30a4\u30d5\u30b5\u30a4\u30af\u30eb\u306b\u308f\u305f\u3063\u3066\u754c\u9762\u5265\u96e2\u306e\u30ea\u30b9\u30af\u3092\u6700\u5c0f\u9650\u306b\u6291\u3048\u3089\u308c\u307e\u3059\u3002.<\/p>\n<p><!-- Numbered List --><\/p>\n<p style=\"font-size: 18px;line-height: 1.8em;text-align: left;margin-bottom: 16px\">\u6a5f\u68b0\u7684\u30a2\u30f3\u30ab\u30fc\u30ea\u30f3\u30b0\u8a2d\u8a08\u30eb\u30fc\u30eb\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\uff1a<\/p>\n<ol style=\"font-size: 18px;line-height: 1.8em;margin-bottom: 24px;padding-left: 24px;list-style-type: decimal\">\n<li style=\"margin-bottom: 12px;text-align: left\"><strong>\u30c0\u30d6\u30c6\u30fc\u30eb\u6e9d\u306e\u914d\u7f6e<\/strong>\u2014\u5468\u8fba\u30a8\u30c3\u30b8\u306b\u6cbf\u3063\u3066\u30a2\u30f3\u30c0\u30fc\u30ab\u30c3\u30c8\u30c1\u30e3\u30cd\u30eb\u3092\u6a5f\u68b0\u52a0\u5de5\u3059\u308b\u3053\u3068\u3067\u3001\u52d5\u7684\u306a\u5265\u96e2\u529b\u306b\u5bfe\u3057\u3066\u30a8\u30e9\u30b9\u30c8\u30de\u30fc\u3092\u30ed\u30c3\u30af\u3057\u307e\u3059\u3002.<\/li>\n<li style=\"margin-bottom: 12px;text-align: left\"><strong>\u8cab\u901a\u30d5\u30ed\u30fc\u30dd\u30fc\u30c8<\/strong>\u2014\u30b3\u30a2\u8cab\u901a\u7a74\u3092\u8a2d\u3051\u308b\u3053\u3068\u3067\u3001\u30bb\u30ab\u30f3\u30c9\u30b7\u30e7\u30c3\u30c8\u306e\u6eb6\u878d\u7269\u304c\u57fa\u677f\u3092\u901a\u904e\u3057\u3001\u4e21\u5074\u3067\u30ea\u30d9\u30c3\u30c8\u7559\u3081\u3067\u304d\u307e\u3059\u3002.<\/li>\n<li style=\"margin-bottom: 12px;text-align: left\"><strong>\u30b3\u30fc\u30ca\u30fc\u534a\u5f84\u306e\u6700\u9069\u5316<\/strong>\u2014\u5185\u90e8\u30b3\u30fc\u30ca\u30fc\u3092\u6700\u5c0f0.5 mm\u306e\u534a\u5f84\u3067\u4e38\u3081\u308b\u3053\u3068\u3067\u3001\u5c40\u6240\u7684\u306a\u5fdc\u529b\u96c6\u4e2d\u3092\u6392\u9664\u3057\u307e\u3059\u3002.<\/li>\n<li style=\"margin-bottom: 12px;text-align: left\"><strong>\u57fa\u677f\u30dd\u30b1\u30c3\u30c8\u6df1\u3055<\/strong>\u2014\u30dd\u30b1\u30c3\u30c8\u6df1\u3055\u3092\u6240\u671b\u306e\u30a8\u30e9\u30b9\u30c8\u30de\u30fc\u539a\u3055\u3068\u7b49\u3057\u304f\u4fdd\u3064\u3053\u3068\u3067\u3001\u5916\u9762\u3092\u30d5\u30e9\u30c3\u30c8\u306b\u4ed5\u4e0a\u3052\u307e\u3059\u3002.<\/li>\n<\/ol>\n<\/section>\n<p><!-- Section 3 (\u4e2d\u540e\u90e8\uff1a\u76ee\u6807\u8bcd\u4e0d\u52a0\u7c97) --><\/p>\n<section id=\"shut-off-design\" style=\"margin-bottom: 50px\">\n<h2 style=\"font-size: 28px;line-height: 1.5em;font-weight: bold;margin-top: 40px;margin-bottom: 24px;color: #111111;border-bottom: 1px solid #eaeaea;padding-bottom: 8px\">\u30a8\u30e9\u30b9\u30c8\u30de\u30fc\u306e\u30d5\u30e9\u30c3\u30b7\u30e5\u3092\u9632\u3050\u30b7\u30e3\u30c3\u30c8\u30aa\u30d5\u30e9\u30f3\u30c9\u8a2d\u8a08<\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3137\" src=\"https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/mold-shut-off-edge-land.webp\" alt=\"mold-shut-off-edge-land\" width=\"1376\" height=\"768\" srcset=\"https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/mold-shut-off-edge-land.webp 1376w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/mold-shut-off-edge-land-300x167.webp 300w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/mold-shut-off-edge-land-1024x572.webp 1024w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/mold-shut-off-edge-land-768x429.webp 768w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/mold-shut-off-edge-land-18x10.webp 18w\" sizes=\"auto, (max-width: 1376px) 100vw, 1376px\" \/><\/p>\n<p style=\"font-size: 18px;line-height: 1.8em;text-align: left;margin-bottom: 24px\">Applying principles from an overmolding design guide prevents low-viscosity soft resins from leaking past cavity boundaries during secondary injection. Mold shut-off steel clamps directly against the pre-molded substrate to seal the overmold cavity. Designing flat <strong>\u30b7\u30e3\u30c3\u30c8\u30aa\u30d5\u30e9\u30f3\u30c9<\/strong> with a minimum width of 0.5 mm to 1.0 mm provides a positive mechanical barrier against molten rubber flow.<\/p>\n<p style=\"font-size: 18px;line-height: 1.8em;text-align: left;margin-bottom: 24px\">Incorporating a 90-degree edge step measuring at least 0.5 mm deep along the overmold perimeter creates a sharp cutoff line. Sharp cutoff steps hide transition seams and prevent soft rubber from feathering into razor-thin edges that peel easily. Precision tool steel fitment ensures clean, cosmetic separation lines between rigid and flexible polymer boundaries.<\/p>\n<\/section>\n<p><!-- Section 4 (\u540e\u90e8\uff1a\u76ee\u6807\u8bcd\u4e0d\u52a0\u7c97\uff0c\u603b\u7ed3\u4e0e\u5de5\u5382\u5b9e\u529b) --><\/p>\n<section id=\"why-jucheng\" style=\"margin-bottom: 50px\">\n<h2 style=\"font-size: 28px;line-height: 1.5em;font-weight: bold;margin-top: 40px;margin-bottom: 24px;color: #111111;border-bottom: 1px solid #eaeaea;padding-bottom: 8px\">Why Choose JUCHENG for Overmolding DfM &amp; Tooling<\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3141\" src=\"https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/jucheng-advanced-injection-molding-press.webp\" alt=\"jucheng-advanced-injection-molding-press\" width=\"1376\" height=\"768\" srcset=\"https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/jucheng-advanced-injection-molding-press.webp 1376w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/jucheng-advanced-injection-molding-press-300x167.webp 300w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/jucheng-advanced-injection-molding-press-1024x572.webp 1024w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/jucheng-advanced-injection-molding-press-768x429.webp 768w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/jucheng-advanced-injection-molding-press-18x10.webp 18w\" sizes=\"auto, (max-width: 1376px) 100vw, 1376px\" \/><\/p>\n<p style=\"font-size: 18px;line-height: 1.8em;text-align: left;margin-bottom: 24px\">Partnering with JUCHENG for multi-material encapsulation projects provides access to an extensive production floor equipped with 35+ automated injection presses ranging from 15T to 3000T clamping force. Operating an in-house tool room with 25 sets of 5-axis CNC machines permits precise machining of shut-off steel lands from hardened <a href=\"https:\/\/www.jcinjectionmolding.com\/ja\/materials\/mold-steel\/s136-mold-steel\/\"><strong>S136\u30b9\u30c6\u30f3\u30ec\u30b9\u92fc<\/strong><\/a> \u307e\u305f\u306f <strong>H13\u5de5\u5177\u92fc<\/strong>. Our engineering team delivers a free 24-hour DfM review for every CAD submission, analyzing substrate wall thickness, draft angles, and shut-off feasibility before cutting steel.<\/p>\n<p style=\"font-size: 18px;line-height: 1.8em;text-align: left;margin-bottom: 24px\">Adhering to a strict overmolding design guide minimizes tooling revisions during <a href=\"https:\/\/www.jcinjectionmolding.com\/ja\/service\/overmolding-services\/\"><strong>\u30aa\u30fc\u30d0\u30fc\u30e2\u30fc\u30eb\u30c7\u30a3\u30f3\u30b0\u5c04\u51fa\u6210\u5f62<\/strong><\/a>. IATF 16949\u304a\u3088\u3073ISO 13485\u8a8d\u8a3c\u306e\u54c1\u8cea\u7ba1\u7406\u30b7\u30b9\u30c6\u30e0\u304c\u3059\u3079\u3066\u306e\u30de\u30eb\u30c1\u30b7\u30e7\u30c3\u30c8\u751f\u7523\u3092\u652f\u3048\u3001\u81ea\u52d5\u8eca\u30d7\u30ed\u30b0\u30e9\u30e0\u5411\u3051\u306e\u5b8c\u5168\u306aPPAP\u30ec\u30d9\u30eb3\u6587\u66f8\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002ISO\u30af\u30e9\u30b98\u306e\u30af\u30ea\u30fc\u30f3\u30eb\u30fc\u30e0\u6210\u5f62\u90e8\u9580\u3092\u904b\u55b6\u3057\u3001\u6210\u5f62\u304a\u3088\u3073\u30c9\u30ed\u30c3\u30d7\u30d1\u30c3\u30b1\u30fc\u30b8\u30f3\u30b0\u4e2d\u306e\u533b\u7642\u90e8\u54c1\u3092\u7c92\u5b50\u6c5a\u67d3\u304b\u3089\u4fdd\u8b77\u3057\u307e\u3059\u3002.<\/p>\n<\/section>\n<p><!-- FAQ Section (Module 5: 6 FAQs) --><\/p>\n<section id=\"faq\" style=\"margin-bottom: 40px\">\n<h2 style=\"font-size: 28px;line-height: 1.5em;font-weight: bold;margin-top: 40px;margin-bottom: 24px;color: #111111;border-bottom: 1px solid #eaeaea;padding-bottom: 8px\">\u3088\u304f\u3042\u308b\u8cea\u554f (FAQ)<\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3135\" src=\"https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/measuring-overmolded-elastomer-wall-thickness.webp\" alt=\"measuring-overmolded-elastomer-wall-thickness\" width=\"1376\" height=\"768\" srcset=\"https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/measuring-overmolded-elastomer-wall-thickness.webp 1376w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/measuring-overmolded-elastomer-wall-thickness-300x167.webp 300w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/measuring-overmolded-elastomer-wall-thickness-1024x572.webp 1024w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/measuring-overmolded-elastomer-wall-thickness-768x429.webp 768w, https:\/\/www.jcinjectionmolding.com\/wp-content\/uploads\/2026\/08\/measuring-overmolded-elastomer-wall-thickness-18x10.webp 18w\" sizes=\"auto, (max-width: 1376px) 100vw, 1376px\" \/><\/p>\n<div style=\"margin-bottom: 30px\">\n<h3 style=\"font-size: 22px;line-height: 1.5em;font-weight: bold;margin-top: 24px;margin-bottom: 12px;color: #111111\">What is the ideal wall thickness for TPE and TPU overmolding?<\/h3>\n<p style=\"font-size: 18px;line-height: 1.8em;text-align: left;margin-bottom: 24px\">Ideal wall thickness for TPE and TPU overmolding layers ranges from 1.5 mm to 3.0 mm. Thinner walls below 1.0 mm increase flow resistance and risk short shots, while thicker walls above 4.0 mm cause prolonged cooling cycles and cosmetic sink marks.<\/p>\n<\/div>\n<div style=\"margin-bottom: 30px\">\n<h3 style=\"font-size: 22px;line-height: 1.5em;font-weight: bold;margin-top: 24px;margin-bottom: 12px;color: #111111\">Why are mechanical undercuts recommended in overmolding CAD design?<\/h3>\n<p style=\"font-size: 18px;line-height: 1.8em;text-align: left;margin-bottom: 24px\">Mechanical undercuts like dovetail grooves and through-holes physically lock the elastomer onto the rigid substrate. Physical anchoring ensures that soft grips and seals remain permanently attached even if chemical bonding weakens under thermal cycling or chemical exposure.<\/p>\n<\/div>\n<div style=\"margin-bottom: 30px\">\n<h3 style=\"font-size: 22px;line-height: 1.5em;font-weight: bold;margin-top: 24px;margin-bottom: 12px;color: #111111\">How do shut-off lands prevent elastomer flash on cosmetic surfaces?<\/h3>\n<p style=\"font-size: 18px;line-height: 1.8em;text-align: left;margin-bottom: 24px\">Tooling shut-off lands clamp firmly against the rigid substrate along a 0.5 mm to 1.0 mm wide sealing face. Designing a 90-degree step along the perimeter creates a sharp cutoff edge that blocks molten elastomer from bleeding over appearance faces.<\/p>\n<\/div>\n<div style=\"margin-bottom: 30px\">\n<h3 style=\"font-size: 22px;line-height: 1.5em;font-weight: bold;margin-top: 24px;margin-bottom: 12px;color: #111111\">Can sharp internal corners cause overmolded elastomer peeling?<\/h3>\n<p style=\"font-size: 18px;line-height: 1.8em;text-align: left;margin-bottom: 24px\">Sharp internal corners create localized stress concentrations and impede smooth elastomer flow. Adding generous radii (minimum 0.5 mm) at all transition corners promotes uniform melt packing and enhances interfacial bond durability.<\/p>\n<\/div>\n<div style=\"margin-bottom: 30px\">\n<h3 style=\"font-size: 22px;line-height: 1.5em;font-weight: bold;margin-top: 24px;margin-bottom: 12px;color: #111111\">How does substrate preheating improve overmolding adhesion?<\/h3>\n<p style=\"font-size: 18px;line-height: 1.8em;text-align: left;margin-bottom: 24px\">Preheating the rigid plastic substrate to 70\u00b0C-90\u00b0C slows the cooling rate of the incoming second-shot melt. Warm boundary surfaces allow polymer chains from both materials to interdiffuse deeply, forming a strong chemical fusion bond.<\/p>\n<\/div>\n<div style=\"margin-bottom: 0\">\n<h3 style=\"font-size: 22px;line-height: 1.5em;font-weight: bold;margin-top: 24px;margin-bottom: 12px;color: #111111\">Why is an early DfM review essential before cutting overmolding mold steel?<\/h3>\n<p style=\"font-size: 18px;line-height: 1.8em;text-align: left;margin-bottom: 24px\">Conducting an early DfM review evaluates nominal wall thicknesses, shut-off angles, and gate placements while the design is still digital. Identifying potential flash or sink risks early eliminates costly mold rework and long tooling delays.<\/p>\n<\/div>\n<\/section>\n<\/article>","protected":false},"excerpt":{"rendered":"<p>Designing multi-material polymer components requires balancing wall thickness ratios, shut-off steel angles, and mechanical anchoring features inside the 3D CAD model. Integrating flexible elastomeric layers directly over rigid plastic substrates provides tactile ergonomics, impact protection, and fluidic sealing without secondary mechanical fasteners. Improper wall transitions or weak perimeter shut-offs trigger severe manufacturing defects like edge peeling, elastomeric flash, and localized sink marks. Establishing standardized DfM guidelines during initial 3D modeling eliminates costly tool modifications and ensures high-yield series production. This technical engineering guide analyzes wall thickness ratios, mechanical undercut geometries, and shut-off land sealing parameters. Table of Contents 1. Wall Thickness Transitions &amp; Preventing Soft Rubber Sink Marks 2. Designing [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3138,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-3134","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"_links":{"self":[{"href":"https:\/\/www.jcinjectionmolding.com\/ja\/wp-json\/wp\/v2\/posts\/3134","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.jcinjectionmolding.com\/ja\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.jcinjectionmolding.com\/ja\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.jcinjectionmolding.com\/ja\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.jcinjectionmolding.com\/ja\/wp-json\/wp\/v2\/comments?post=3134"}],"version-history":[{"count":0,"href":"https:\/\/www.jcinjectionmolding.com\/ja\/wp-json\/wp\/v2\/posts\/3134\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.jcinjectionmolding.com\/ja\/wp-json\/wp\/v2\/media\/3138"}],"wp:attachment":[{"href":"https:\/\/www.jcinjectionmolding.com\/ja\/wp-json\/wp\/v2\/media?parent=3134"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.jcinjectionmolding.com\/ja\/wp-json\/wp\/v2\/categories?post=3134"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.jcinjectionmolding.com\/ja\/wp-json\/wp\/v2\/tags?post=3134"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}