Vehicle Trim Component Adhesive-Free Foam Bonding
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Solution Overview
Problem
Conventional soft interior trim components for vehicles require separate foam layers and adhesives for bonding, which can be cumbersome and inefficient in manufacturing.
Innovation Solution
A method involving forming an outer and inner skin layer with a foam layer, where the foam extension is thinner than the main foam portion, allowing the layers to be bonded to a substrate without adhesives, and wrapped around its edges for secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If separate foam layers and adhesives are used to bond trim components, then the trim component can be constructed with soft interior surfaces, but the manufacturing process becomes cumbersome and inefficient
Solution Approach 1:
The patent combines the foam layer and skin layers into a single integrated foam-in-place structure, eliminating the need for separate foam layers and adhesives. The foam is sprayed directly onto the skin layers, causing it to expand and bond them together in one step, thereby simplifying the manufacturing process and reducing component complexity
Solution Approach 2:
The skin layers are pre-formed with extensions that extend beyond the substrate edges before the foam is applied. This preliminary preparation allows the foam to automatically bond the layers together when sprayed, eliminating the need for subsequent adhesive application and simplifying the overall manufacturing process
2Reliability
If foam extensions are made thinner than the main foam portion, then the layers can be wrapped around substrate edges for secure attachment, but the foam layer requires precise thickness control during spraying
Solution Approach 1:
The foam layer is designed with varying thicknesses in different regions: a thinner foam extension at the edges for wrapping around substrate edges, and a thicker main foam portion in the center for providing structural support and comfort. This local differentiation of foam quality allows the component to achieve both secure attachment and reliable performance
Solution Approach 2:
The foam extension is designed to wrap around the substrate edges in three dimensions, transitioning from a flat layer to a wrapped configuration. This dimensional change allows the thinner foam extension to achieve secure attachment by encircling the substrate edges, compensating for the reduced thickness through geometric configuration
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 method simplifies the manufacturing process by eliminating the need for adhesives and ensures a secure, compressible trim component with reduced draft issues during molding.
Implementation Method 1
spraying a foam layer on the inner skin layer so that a main foam portion of the foam layer is disposed on the main inner skin portion and a foam extension is disposed on the inner skin extension
Data Source
AI summary
A method for manufacturing a trim component includes the following steps: (a) forming an outer skin layer in the shape of a trim component; (b) applying an inner skin layer on the outer skin layer; (c) spraying a foam layer on the inner skin layer; (d) disposing a substrate on the foam layer; and (e) wrapping portions of the inner skin layer, the outer skin layer, and the foam layer around at least one edge of the substrate.