Multi-Shot Injection Barrier Inserts for Automotive Lighting
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Solution Overview
Problem
In the automotive field of vehicle lighting, larger scaled polymeric structures with light transmissive characteristics often exhibit visibly observable defects such as remelt, color bleed, and micro-formed inconsistencies due to conventional manufacturing processes, which detract from the structural aesthetics and optical quality.
Innovation Solution
A multi-shot polymeric injection process that incorporates polymeric inserts within the mold to prevent superficial melt and color mixing between interfacial layers, ensuring that the base layer and overlay stack remain distinct and free of defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multi-step or multi-layer mold injection processes are used to create larger scaled polymeric structures, then the structural complexity and functionality are improved, but visible defects such as remelt, color bleed, and micro-formed inconsistencies occur
Solution Approach 1:
A barrier layer is introduced between the base layer and overlay stack to prevent direct contact and interaction between the two polymeric materials. This intermediary layer acts as a mediator that blocks remelt and color bleed while allowing the multi-layer structure to maintain its structural complexity and functionality.
Solution Approach 2:
The polymeric structure is divided into distinct segments: a base layer, a barrier layer, and an overlay stack. This segmentation isolates each layer's function and prevents unwanted interaction between adjacent layers, thereby eliminating visible defects while preserving the overall structural complexity.
2Productivity
If conventional mold injection processes are used for larger scaled polymeric structures, then manufacturing efficiency is maintained, but cosmetic defects such as remelt and color bleed become more observable
Solution Approach 1:
The barrier layer serves as a protective intermediary that prevents cosmetic defects like remelt and color bleed from occurring during the injection process. This allows conventional efficient manufacturing processes to be used without producing observable cosmetic defects in the final product.
Solution Approach 2:
The barrier layer converts the potential harm of material interaction into a benefit by using the same polymeric material for the barrier layer that is being injected, thereby preventing defects while maintaining manufacturing efficiency and not adding significant complexity to the process.
3Strength
If thicker high-quality polymeric structures are formulated through multi-step injection, then structural integrity is improved, but the risk of visible defects between injection stages increases
Solution Approach 1:
The barrier layer acts as a reliable intermediary that prevents defect formation at the interfaces between the base layer and overlay stack. This allows thicker polymeric structures to be formulated through multi-step injection while maintaining both structural integrity and defect-free appearance.
Solution Approach 2:
By segmenting the structure into distinct layers separated by the barrier layer, the patent enables thicker overall structures to be created while preventing defect propagation between layers, thereby improving both structural integrity and appearance reliability.
Data Source
AI summary
This invention relates to the prevention and formation control of visible defects within multi-color and light-transmissive polymeric structures manufactured through multi-shot mold injection processes. The system and method can be applied to fabricate multi-layer light-transmissive products that control and eliminate visible or conspicuous defects and thus enhance the aesthetics of the associated structures such that visible defects or molded-in imperfections are effectively eliminated or not discernable to a casual observer.