Custom Two-Shot Injection Molding Services
JeekMould provides custom two-shot injection molding services for multi-material and two-color plastic parts. This process combines two plastics or one rigid plastic with a soft material in one molded part, helping create soft-touch areas, sealing features, color zones, light guide structures, and integrated functional components.
If required, Jeek can sign an NDA before project discussion！
How Two-Shot Injection Molding Works
Two-shot injection molding uses two injection steps to form a multi-material or two-color part in one molding process. The first shot usually creates the rigid structure, and the second shot adds a soft-touch layer, sealing area, color zone, optical feature, or functional surface.
This process can reduce secondary assembly, improve material bonding, control alignment between materials, and support stable production for high-volume plastic parts.
✅ Lower Assembly Cost
✅Stable Production Lead Time
✅Functional Integration
Why Choose JeekMould for Two-Shot Molding
✅ Material compatibility and bonding review
✅ Shrinkage and alignment control between two shots
✅ Mold design for soft-touch, sealing, color, or optical zones
✅ IMold trial and process adjustment before production
✅ Inspection for appearance, dimensions, bonding, and fit
Two-Shot Injection Molding Machine
We operate in-house two-shot injection molding machines capable of multi-material and dual-color production.
Two-Shot Mold
We design and manufacture precision two-shot molds for complex geometries and integrated structures.
| 1st Shot (Structural Layer) | 2nd Shot (Overmold/Decorative Layer) | Application Function |
|---|---|---|
| PC | TPE | Soft-touch grip, button tactile zones |
| ABS | PC | Decorative or reinforced exterior |
| PP | TPE | Sealing lips, flexible transitions |
| PMMA | PC | Light guide and optical clarity |
| PA | TPU | Wear-resistant moving features |
Material compatibility, shrinkage rate, bonding strength, and molding temperature must be reviewed before mold manufacturing.
Examples of two-shot injection molding material combinations
Two-Shot Injection Molding Applications
Automotive
Two-shot molding is used for interior buttons, trim parts, seals, light guide components, and multi-material headlamp structures.
Electronics
Common parts include device housings, buttons, connector covers, soft-touch grips, and protective frames.
Medical
Two-shot molding can support handles, device housings, sealing areas, ergonomic grips, and components that need stable fit and appearance.
Two-Shot Injection Molding FAQs
How many materials or colors can be molded in a single part?
Two materials/colors are most common; for high-volume production, a three-color injection molding solution can be adopted.
How to select compatible material combinations for two-color injection molding?
First evaluate resin bonding strength and shrinkage rate compatibility, then consider mechanical properties and appearance requirements.
When is two-color injection molding more cost-effective than injection molding + assembly?
When multi-material features are critical and annual production volume is sufficient to amortize mold investment.
How small can alignment tolerances be between two shots?
Typically, alignment tolerances for most geometries are ±0.05 mm, depending on material flow and interface geometry.
Can soft TPE overmolding be applied to transparent PC light guide areas?
Yes, by optimizing gate and vent designs to prevent flow marks and bubbles.