Airbag Housing Cover TPE Composition for Display Light Diffusion
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Solution Overview
Problem
Existing thermoplastic elastomer compositions for airbag housing covers lack appropriate light transmittance and diffusibility, which are necessary for incorporating touch panel displays while maintaining low-temperature impact resistance and high-temperature strength.
Innovation Solution
A thermoplastic elastomer composition comprising a propylene-based polymer, an elastomer, and a colorant, with controlled total light transmittance between 0.001% and 70%, and specific properties for low-temperature impact resistance and high-temperature strength, is used to create an airbag housing cover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional thermoplastic elastomer compositions are used for airbag housing covers, then low-temperature impact resistance and high-temperature strength are achieved, but light transmittance and light diffusibility are insufficient for touch panel display integration
Solution Approach 1:
The patent adjusts the composition parameters of the thermoplastic elastomer, specifically controlling the content of propylene-based polymer (30-70 parts by mass), elastomer (20-60 parts by mass), and colorant (0.1-5 parts by mass) to achieve optimal light transmittance while maintaining mechanical properties. The total light transmittance is controlled within 10-70% by adjusting these compositional parameters.
Solution Approach 2:
The patent creates a composite thermoplastic elastomer material combining propylene-based polymer, elastomer, and colorant in specific proportions. This composite formulation achieves a balance between optical properties (light transmittance and diffusibility) and mechanical properties (impact resistance and strength) that neither component alone could provide.
2Illumination intensity
If light transmittance is increased for touch panel visibility, then user can easily see lighting of light sources, but the airbag stored in the housing cover becomes clearly visible which is undesirable from design perspective
Solution Approach 1:
The patent incorporates colorants into the thermoplastic elastomer composition to modify the optical properties. The colorant not only provides coloration but also controls light diffusibility, creating a balanced optical effect where light can pass through for touch panel visibility while the airbag itself remains obscured, achieving both functionality and design aesthetics.
Solution Approach 2:
The patent precisely controls the total light transmittance within the range of 10-70% by adjusting the colorant content (0.1-5 parts by mass) and its distribution in the composite material. This parameter optimization ensures sufficient light transmission for user interaction while preventing the airbag from being clearly visible, thus maintaining design privacy.
3Power
If deployment output of airbag device is increased, then safety is enhanced, but the airbag housing cover has possibility of being injured during deploying at low or high temperature
Solution Approach 1:
The patent formulates a composite thermoplastic elastomer combining propylene-based polymer with elastomer in specific ratios (propylene-based polymer: 30-70 parts, elastomer: 20-60 parts). This composite structure provides enhanced toughness and flexibility, enabling the housing cover to withstand high deployment forces while maintaining integrity at extreme temperatures through the synergistic effect of the components.
Solution Approach 2:
The patent optimizes the compositional parameters and processing conditions of the thermoplastic elastomer to achieve the required mechanical strength. By controlling the elastomer content and colorant distribution, the material exhibits improved resistance to temperature extremes and impact forces, ensuring the housing cover can handle high deployment output without injury.
Data Source
AI summary
An airbag housing cover made of a thermoplastic elastomer composition comprising a propylene-based polymer, an elastomer, and a colorant, wherein the thermoplastic elastomer composition has a total light transmittance of 0.001 or more and 70 or less.