Vehicle Crash Pad Skin Layer Adhesion Elimination
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Solution Overview
Problem
Conventional crash pad manufacturing processes involving skin scoring increase manufacturing costs, cycle time, labor costs, and are prone to seamline exposure, while lacking cost competitiveness and weight reduction.
Innovation Solution
A crash pad design and manufacturing method that omits the skin scoring process, featuring a skin layer with specific tensile strength and elongation properties, integrated with a foaming layer and core layer, using thermoplastic elastomers and a foam sheet for enhanced cushioning and cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If skin scoring process is applied to the skin layer, then the adhesion between skin layer and foaming layer is improved, but manufacturing costs and cycle time increase
Solution Approach 1:
The invention extracts and eliminates the skin scoring process from the manufacturing sequence, achieving adhesion through direct injection molding of the foaming layer onto the skin layer without requiring pre-scoring. This removes the problematic step while maintaining bonding quality.
Solution Approach 2:
The skin layer is prepared in advance with appropriate surface properties and dimensional stability before the foaming layer is injected, ensuring that the skin layer is ready to receive the foaming layer without requiring intermediate scoring operations. This preliminary preparation enables direct bonding.
2Ease of manufacture
If skin scoring process is applied to the skin layer, then the adhesion between skin layer and foaming layer is improved, but manufacturing costs and labor costs increase
Solution Approach 1:
The invention extracts and eliminates the skin scoring process from the manufacturing sequence, achieving adhesion through direct injection molding of the foaming layer onto the skin layer without requiring pre-scoring. This removes the problematic step while maintaining bonding quality.
Solution Approach 2:
The invention merges the skin layer preparation and foaming layer application into a single integrated molding operation, where the skin layer is formed and the foaming layer is injected in one continuous process, eliminating the need for separate scoring and assembly steps.
3Ease of manufacture
If skin scoring process is applied to the skin layer, then the adhesion between skin layer and foaming layer is improved, but seamline exposure occurs
Solution Approach 1:
The invention merges the skin layer preparation and foaming layer application into a single integrated molding operation, where the skin layer is formed and the foaming layer is injected in one continuous process, eliminating the need for separate scoring and assembly steps that create visible seams.
Solution Approach 2:
The skin layer is prepared in advance with appropriate surface properties and dimensional stability before the foaming layer is injected, ensuring that the skin layer is ready to receive the foaming layer without requiring intermediate scoring operations. This preliminary preparation enables direct bonding.
4Reliability
If conventional three-layer structure is used, then cushioning performance is maintained, but weight is increased
Solution Approach 1:
The invention uses composite materials consisting of a skin layer made from thermoplastic elastomer and a foaming layer that integrates cushioning function. This composite structure maintains cushioning performance while reducing overall weight compared to conventional three-layer designs.
Solution Approach 2:
The invention applies different material properties to different regions: the skin layer provides structural integrity and surface quality, while the foaming layer provides localized cushioning. This regional specialization optimizes performance while minimizing weight.
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
The solution simplifies the manufacturing process, reduces costs, and achieves weight reduction while maintaining performance equivalent to traditional crash pads, addressing seamline exposure issues and enhancing cost competitiveness by applying luxurious vehicle specifications to low-cost vehicles.
Implementation Method 1
a foaming layer disposed between the skin layer and the core layer
Implementation Method 2
the skin layer has a tensile strength of about 10 to about 100 kgf/cm2 and an elongation at break of about 50 to about 600%
Data Source
AI summary
The present invention relates to a crash pad for vehicles and a method for preparing the same, and more specifically, a crash pad for vehicles comprising a skin layer forming the outer surface of the crash pad provided with an air-bag module for vehicles; a foaming layer in intimate contact with the lower surface of the skin layer; and a core layer in intimate contact with the lower surface of the foaming layer to form an inner surface, wherein the skin layer has a tensile strength of about 10 to about 100 kgf/cm2 and an elongation at break of about 50 to about 600% according to JIS K6301 method when it has a layer thickness of about 0.2 mm to about 1.0 mm.