{"id":2930,"date":"2026-08-06T10:55:38","date_gmt":"2026-08-06T02:55:38","guid":{"rendered":"https:\/\/www.jcinjectionmolding.com\/?p=2930"},"modified":"2026-08-06T11:14:00","modified_gmt":"2026-08-06T03:14:00","slug":"multi-shot-injection-molding","status":"publish","type":"process","link":"https:\/\/www.jcinjectionmolding.com\/ja\/service\/multi-shot-injection-molding\/","title":{"rendered":"Multi-Shot Injection Molding"},"content":{"rendered":"
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Multi-Shot (2K) Molding Technology & Interfacial Adhesion Profile<\/h2>\n

Multi-shot manufacturing, including \u4e8c\u8272\u5c04\u51fa\u6210\u5f62<\/strong> and multi-material co-injection, combines rigid and flexible polymers in a single automated press cycle:<\/p>\n\n\n\n\n\n\n\n
Multi-Shot Technology<\/th>\nSubstrate & Resin Combination<\/th>\nInterfacial Bonding Advantage<\/th>\n<\/tr>\n<\/thead>\n
Rotary Platen 2K Molding<\/td>\nRigid Polymer (PC, ABS) + Soft Elastomer (\u71b1\u53ef\u5851\u6027\u30a8\u30e9\u30b9\u30c8\u30de\u30fc\uff08TPE\uff09<\/strong>, \u71b1\u53ef\u5851\u6027\u30dd\u30ea\u30a6\u30ec\u30bf\u30f3\uff08TPU\uff09<\/strong>)<\/td>\nForms a permanent thermal chemical weld at the material interface, eliminating post-mold assembly labor and adhesive glues.<\/td>\n<\/tr>\n
Multi-Color Co-Injection<\/td>\nTransparent Polymer + Opaque Pigmented Substrate<\/td>\nDelivers crisp aesthetic back-lit graphics, multi-colored automotive tail lamps, and wear-proof indicator buttons.<\/td>\n<\/tr>\n
Sequential Transfer Molding<\/td>\nRigid Engineering Plastic + \u6db2\u72b6\u30b7\u30ea\u30b3\u30fc\u30f3\u30b4\u30e0\uff08LSR\uff09\u6210\u5f62<\/strong><\/td>\nCreates dynamic, watertight IP68 seals directly over medical or electronic housing frames in a continuous automated cycle.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/section>\n

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Substrate Interfacial Compatibility & Adhesion Matrix<\/h2>\n

Successful multi-shot manufacturing relies on matching chemical surface energies between the primary core and secondary injection phase:<\/p>\n\n\n\n\n\n\n\n
Rigid Substrate Polymer<\/th>\nSoft Elastomer Partner<\/th>\nChemical Adhesion Performance<\/th>\n<\/tr>\n<\/thead>\n
\u30dd\u30ea\u30ab\u30fc\u30dc\u30cd\u30fc\u30c8\uff08PC\uff09<\/strong> \/ ABS<\/strong> Alloys<\/td>\nSpecialized Polar TPE \/ TPU Compounds<\/td>\nExcellent. High interfacial melt diffusion produces a permanent 5B cross-hatch bond, resisting peeling during heavy drop-tests.<\/td>\n<\/tr>\n
\u30dd\u30ea\u30a2\u30df\u30c9\uff08PA\/\u30ca\u30a4\u30ed\u30f3\uff09<\/strong> Structural Frames<\/td>\nModified PA-Adhesive TPE \/ High-Temp TPU<\/td>\nExcellent. Thermal fusion across the high-temperature nylon interface creates rugged, anti-slip hand grips for power tools.<\/td>\n<\/tr>\n
\u30dd\u30ea\u30d7\u30ed\u30d4\u30ec\u30f3\uff08PP\uff09<\/strong> Medical Bodies<\/td>\nSBC-based Medical Grade TPE<\/td>\nExcellent. Chemical similarity between PP and SEBS matrices yields seamless, watertight sealing lip gaskets inside \u751f\u4f53\u9069\u5408\u6027\u30fb\u533b\u7642\u30b0\u30ec\u30fc\u30c9\u6a39\u8102<\/strong> assemblies.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/section>\n

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Multi-Shot Tooling Blueprint: Rotating Platens & Interface Cohesion<\/h2>\n

Executing multi-material \u30d7\u30e9\u30b9\u30c1\u30c3\u30af\u5c04\u51fa\u6210\u5f62<\/strong> with zero part flash or peeling demands specialized tooling architecture and \u30ab\u30b9\u30bf\u30e0\u91d1\u578b\u88fd\u4f5c<\/strong><\/a> precision:<\/p>\n

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1. Rotary Index Platen & Core-Transfer Tooling<\/p>\n

Our multi-shot presses utilize servo-driven rotating index tables. After the primary rigid core is injected, the mold rotates 180 degrees to align with the secondary injection barrel, eliminating manual part transfer and securing tight registration tolerances.<\/p>\n<\/div>\n

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2. Chemical Interfacial Adhesion (Eliminating Peeling)<\/p>\n

To prevent edge peeling between hard and soft layers during \u30aa\u30fc\u30d0\u30fc\u30e2\u30fc\u30eb\u30c7\u30a3\u30f3\u30b0\u30b5\u30fc\u30d3\u30b9<\/strong>, our engineers design mechanical interlocking grooves alongside thermal gate timing. Heat from the secondary shot partially re-melts the substrate surface to forge an unbreakable chemical bond.<\/p>\n<\/div>\n

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3. Micron-Level Parting Line Flash Control<\/p>\n

Soft elastomers flow readily under high melt shear. Jucheng\u2019s 25+ 5-axis CNC machining centers cut hardened S136 stainless steel mold cavities (50 HRC) with micro-tolerances. We maintain shut-off clearances strictly under 0.005mm to ensure flash-free transitions on Thin Wall Injection Molding<\/strong> boundaries.<\/p>\n<\/div>\n

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4. Precision Cleanroom & Multi-Material Automation<\/p>\n

For healthcare disposables and medical seals, multi-shot molding is executed inside certified Cleanroom Injection Molding<\/strong> facilities (ISO Class 7\/8). Robotic pick-and-place systems handle finished parts with zero human contact prior to Post-Molding & Assembly<\/strong>.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

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Key Application Fields for Multi-Shot Molded Components<\/h2>\n