Injection-Moulded Part Embedding Decorative Elements
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Solution Overview
Problem
Existing injection molding processes face challenges in maintaining the pattern and adhesion of decorative elements, leading to potential detachment under mechanical stress due to lack of embedding in the plastic base layer.
Innovation Solution
The process involves embedding decorative elements in both the base and cover layers of the injection molded part, with the cover layer having a thermosetting adhesive surface to secure the elements' position and the base layer embedding the remaining area, ensuring strong adhesion and maintaining the original pattern.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If decorative elements are applied to the top layer and base layer is applied by injection molding, then decorative components can be produced efficiently, but the decorative elements are washed away by inflowing plastic and their arrangement changes
Solution Approach 1:
The patent applies a sticky substance to the top layer before applying decorative elements, creating preliminary adhesion that prevents the elements from being displaced during subsequent injection molding. This preliminary action secures the decorative elements in their intended positions before the base layer is injected.
Solution Approach 2:
The patent introduces a sticky substance as an intermediary layer between the top layer and decorative elements. This intermediary material provides the necessary adhesion to hold decorative elements in place during the injection molding process, resolving the conflict between production efficiency and pattern accuracy.
2Ease of manufacture
If decorative layers are not embedded in the sprayed plastic base layer, then the production process is simpler, but the decorative layers can easily detach under mechanical stress
Solution Approach 1:
The patent applies embedding only to the edges or perimeters of the decorative layers rather than the entire surface. This local quality approach provides sufficient mechanical interlocking for adhesion while maintaining simplicity in the overall manufacturing process, resolving the contradiction between ease of manufacture and reliability.
3Strength
If decorative elements are embedded in both base and cover layers, then bonding strength increases and pattern stability improves, but the manufacturing process becomes more complex
Solution Approach 1:
The patent combines the functions of pattern stabilization and adhesion enhancement into a single sticky substance application step. This merging of functions achieves both embedding and pattern stability without significantly increasing process complexity, as the same sticky material serves multiple purposes in the manufacturing sequence.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enhances the bonding strength between layers, preventing decorative element rearrangement during molding and providing increased resilience and service life under mechanical stress.
Implementation Method 1
The cover layer (2) consists of thermosetting plastic, which has an adhesive surface which secures the position of the decorative elements (3) before curing
Implementation Method 2
The base layer (4) embeds the remaining area of the decorative elements (3)
Implementation Method 3
The cover layer (2) consists of thermosetting plastic, which has an adhesive surface which secures the position of the decorative elements (3) before curing
Data Source
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AI summary
The invention relates to an injection-moulded part comprising a plastics base layer (4), a preferably transparent or translucent top layer (2), also comprising a layer that is between the base layer (4) and the top layer (2) and contains individual decorative elements (3), wherein the decorative elements (3) are at least partly embedded in both the top layer (4) and in the base layer (2). The invention also relates to a method for producing the injection-moulded part, wherein: - decorative elements (3) are placed on a tacky top layer (2) and - a base layer (4) is applied to the decorative elements (3) by injection moulding, wherein, according to the invention - the individual decorative elements (3) are preferably randomly applied to the tacky surface of the top layer (2), - a second top layer (2) is applied if required, - the decorative elements (3) are at least partly embedded in the top layer, - the top layer (2) is allowed to dry, - a base layer (4) is applied to the decorative elements (3) by injection moulding, and so the base layer embeds the remaining region of the decorative elements.