Airbag Sewing Thread Lubricity and Fabric Slippage
Solution Overview
Problem
Conventional airbags fail to achieve improved air-tightness due to silicone oil on sewing threads permeating into the base fabric, leading to slippage and loosening of the weave during deployment.
Innovation Solution
Using a sewing thread treated with a polar group-containing compound as a lubricant, which reduces spreading wettability and migration into the base fabric, thereby enhancing lubricity and preventing weave slippage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If silicone oil is applied to the sewing thread, then lubricity is improved, but the weave slippage resistance deteriorates due to permeation into the base fabric
Solution Approach 1:
The invention changes the polarity parameter of the lubricant from non-polar (silicone oil) to polar (polar group-containing compounds). This parameter change creates a compatibility mismatch that prevents the lubricant from permeating into the polar fiber base fabric, thereby maintaining weave slippage resistance while still providing adequate thread lubricity for high-speed sewing operations.
Solution Approach 2:
The polar group-containing compound acts as an intermediary substance that provides the necessary lubrication function without performing the harmful function of permeating into the base fabric. The polar nature of both the lubricant and the base fabric creates a boundary where the lubricant remains on the thread surface, serving as an effective mediator between the needle and the thread without interfering with the fabric structure.
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 airbag exhibits improved air-tightness and reduced gas leakage at the sewn regions, satisfying the demand for enhanced sealing properties during deployment.
Implementation Method 1
A polar group-containing compound having an action to improve lubricity of the sewing thread... does not usually exhibit a spreading wetting (high migrativity) where a contact angle θ can hardly be measured
Implementation Method 2
a silicone oil (non-polar oleum)... exhibits a spreading wetting (high migrativity) where a contact angle θ can hardly be measured
Implementation Method 3
the yarn is treated by a lubricating agent that consists of a polar group-containing compound having an action to improve lubricity of the sewing thread
Data Source
AI summary
An airbag is manufactured by sewing a base fabric woven with a first polar fiber by means of a sewing thread. The sewing thread is made up of a yarn formed from a second polar fiber such as nylon 66, and the yarn is subjected to a lubrication treatment using a lubricating agent that consists of a polar group-containing compound having an action to improve lubricity of the sewing thread or that contains mainly such a polar group-containing compound.