A two-color injection molding (IML) process with a character pattern suspended in the middle layer

By printing characters on a PC film and combining it with a two-color injection molding process, the problem of the character pattern being suspended in the middle layer of a transparent plastic part was solved, achieving a three-dimensional visual effect and a uniform backlight effect, thus improving the product's aesthetics and functionality.

CN120481188BActive Publication Date: 2026-06-26WENZHOU CHANGJIANG AUTOMOBILE ELECTRONICS SYST
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
WENZHOU CHANGJIANG AUTOMOBILE ELECTRONICS SYST
Filing Date
2025-06-05
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing technologies cannot achieve the goal of suspending character patterns in the middle layer of transparent plastic parts, thus failing to simultaneously possess aesthetics, durability, and functionality. Furthermore, traditional processes suffer from problems such as easy wear and tear on the characters and insufficient bonding strength.

Method used

The characters and patterns are printed on the PC film using screen printing, and combined with a two-color injection molding process, the first layer of transparent PMMA material is injected and fused with the character area, and the second layer is injected at the bottom of the transparent film. Through the cooperation of positioning holes and mold cavity, a three-dimensional visual effect of characters floating in the middle layer is formed, and a light source illumination area is reserved to achieve a backlight effect.

Benefits of technology

It achieves a three-dimensional visual effect where the characters and patterns float in the middle layer, enhancing the product's aesthetics and durability. At the same time, it achieves a uniform backlight effect through the light guide structure, improving the product's functionality.

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Abstract

The application discloses a double-color injection molding IML forming process with a character pattern suspended in a middle layer, breaks through the bottleneck that a traditional suspended pattern needs to be printed on the back of a transparent piece and limits the back structure design. By silk-screening a character pattern on the front of a PC film piece, covering a non-character area with a black primer and filling a high-transmittance white ink, and setting a precise positioning hole and structure in the back black area, the pattern suspension three-dimensional effect is realized, and interference with the appearance of the product is avoided; in combination with a double-color transparent injection molding process, a first layer of transparent PMMA material is injected and fused and solidified with the character area, and a second layer is injected at the bottom of the transparent film piece, so that the character is suspended in the transparent interlayer, and visual impact is achieved.
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