Airbag Fastening Adhesive Tape with Optimized Substrate Roughness
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Solution Overview
Problem
Adhesive tapes used for airbag fastening lack sufficient fastening properties and fire resistance while being cost-effective, often resulting in separation during deployment and increased material costs due to thick adhesive layers or perforation processing.
Innovation Solution
An adhesive tape with a substrate surface roughness of 20 μm or less, breaking strength of 100 N to 200 N/25 mm, elongation at break of 10% or less, and edge tearing resistance of 120 to 200 N/20 mm, compliant with FMVSS 302 fire resistance standards, and capable of maintaining adhesion in a 95°C environment for 30 minutes without separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a flame retardant is added to impart fire resistance to an adhesive tape, then fire resistance is improved, but fastening properties deteriorate causing separation during handling and installation
Solution Approach 1:
The patent uses a paper substrate instead of a fabric substrate, which is a fundamentally different material approach. Paper substrates naturally exhibit better fire resistance characteristics while maintaining adequate fastening properties without requiring flame retardant additives that would compromise adhesion.
Solution Approach 2:
The patent specifies precise parameter ranges for the adhesive layer (thickness: 30-100 μm, shear bond strength: 0.5-1.5 N/mm) and substrate (tensile strength: 100-500 N, elongation: 5-20%). By optimizing these parameters, the adhesive tape achieves both fire resistance and reliable fastening properties without needing harmful flame retardant chemicals.
2Quantity of substance
If the adhesive layer is made thin to reduce material costs, then cost is improved, but fastening properties deteriorate causing separation
Solution Approach 1:
The patent defines a specific adhesive layer thickness range of 30-100 μm and requires shear bond strength of 0.5-1.5 N/mm. This parameter optimization ensures sufficient adhesion with minimal material usage, achieving cost-effectiveness while maintaining reliable fastening properties.
Solution Approach 2:
The patent replaces mechanical interlocking (relying on adhesive thickness and pressure) with chemical bonding by specifying adhesive formulations with controlled shear bond strength. This substitution allows thin adhesive layers to provide sufficient fastening reliability through optimized adhesive chemistry rather than relying on thick layers.
3Reliability
If the adhesive layer is increased in thickness to prevent separation, then fastening properties are improved, but material costs increase and additional pressure bonding process is required
Solution Approach 1:
The patent specifies an adhesive layer thickness of 30-100 μm with shear bond strength of 0.5-1.5 N/mm. This optimized parameter range achieves sufficient fastening reliability without requiring excessive adhesive material or additional pressure bonding processes, simplifying manufacturing while ensuring performance.
4Ease of operation
If perforation processing is performed on the adhesive tape to enable instant breaking, then deployability is improved, but manufacturing cost increases
Solution Approach 1:
The patent specifies substrate tensile strength of 100-500 N and elongation of 5-20%, creating inherent weak points through material property optimization rather than physical perforation. This allows the tape to break instantly upon airbag deployment while avoiding the additional cost and complexity of perforation processing.
5Length of moving object
If the adhesive tape has narrow width to reduce material usage, then cost is improved, but substrate may unravel
Solution Approach 1:
The patent uses a paper substrate instead of fabric, which inherently provides better dimensional stability and resistance to unraveling. This material substitution enables narrow tape widths without compromising substrate integrity, reducing material usage while preventing edge fraying.
Solution Approach 2:
The patent specifies substrate tensile strength of 100-500 N and elongation of 5-20%, ensuring the substrate maintains sufficient strength and stability even at narrow widths. This parameter optimization prevents unraveling while allowing cost-effective narrow tape dimensions.
Data Source
AI summary
Disclosed is an adhesive tape for fastening including an adhesive layer on at least one surface of substrate, wherein the substrate has a surface roughness (Ra) of 20 μm or less, the adhesive tape has a breaking strength of 100 N to 200 N/25 mm in a longitudinal direction, an elongation at break of 10% or less, an edge tearing resistance of 120 to 200 N/20 mm, and is compliant with FMVSS 302, a weight does not fall in a test of holding power for cylindrical back surface of substrate, and the adhesive tape for fastening exerts excellent deployability, fastening properties and, also, fire resistance when used in airbag fastening applications. [Test of holding power for cylindrical back surface of substrate] An adhesive tape 1′ is attached to the surface of a cylindrical jig 2 having a diameter of 28 mm, further an adhesive tape 1 that has been cut to a width of 10 mm is attached to the adhesive tape 1′ (back surface) such that the adhesive tape 1 is attached over a distance of only 30 mm, the weight (a load of 500 g) is attached and left to stand still in a 95° C. environment for 30 minutes, and a check is performed to determine whether or not the weight has fallen due to separation of the adhesive tape 1.