Airbag Base Fabric Structure for Airtight Fast Deployment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional airbag base fabrics fail to achieve high-speed deployment while maintaining airtightness and pressure resistance, especially in side curtain airbags, due to issues with air permeability and stress concentration at the boundary between the inflating and non-inflating parts.
Innovation Solution
A base fabric composed of multifilament synthetic fibers with specific fineness, elongation, and pullout resistance, optimized through specific weaving and processing conditions to reduce air permeability and enhance tensile rigidity, is developed. This includes a total fineness of 200 to 550 dtex, single filament fineness of 2.0 to 7.0 dtex, and elongation under loads of 50 N/cm and 300 N/cm within specific ranges, along with a pullout resistance of 50 to 200 N/cm/cm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the air permeability of the base fabric is reduced to improve airtightness, then the airtightness is improved, but the deployment speed is not sufficiently increased because the boundary portion governs the deployment speed
Solution Approach 1:
The invention applies local quality by treating the boundary portion differently from the rest of the base fabric. It specifies that the pullout resistance of the constituent yarn in the boundary portion should be 50 to 200 N/cm/cm, which is a localized property enhancement. This ensures that the critical boundary portion maintains airtightness and structural integrity without compromising overall deployment speed, addressing the specific weakness at the inflating/non-inflating interface.
2Weight of moving object
If the weight of the bag body is reduced to enable high-speed deployment, then the deployment speed is improved, but the pressure resistance and airtightness may be compromised
Solution Approach 1:
The invention optimizes the yarn fineness parameters to achieve a balance between weight and strength. By specifying a total fineness of 200 to 550 dtex and single filament fineness of 2.0 to 7.0 dtex, the fabric achieves lightweight construction while maintaining sufficient pressure resistance and airtightness through the optimized fiber structure and enhanced pullout resistance at critical portions.
3Speed
If the elongation of the base fabric is controlled to increase deployment speed, then the deployment speed is improved, but the impact absorption capability decreases
Solution Approach 1:
The invention applies local quality by specifying different elongation characteristics for different portions of the fabric. The boundary portion is designed with specific pullout resistance (50 to 200 N/cm/cm) to control its elongation behavior, allowing it to resist opening during deployment while the rest of the fabric maintains appropriate elongation for impact absorption. This localized control resolves the contradiction between deployment speed and impact safety.
Data Source
AI summary
An object of the present invention is to provide a base fabric suitable for the production of a general-purpose airbag having a higher airtight performance with reduced air permeability, a high pressure resistance in the boundary portion between the inflating part and the non-inflating part, and a high impact absorption for an occupant, and a base fabric for an airbag of the present invention comprises a woven fabric formed of a multifilament synthetic fiber having a total fineness of 200 to 550 dtex and a single filament fineness of 2.0 to 7.0 dtex, wherein the elongation is, on average of warp and weft, from 5 to 15% and from 15 to 30% under loads of 50 N/cm and 300 N/cm, respectively, and the pullout resistance of the constituent yarn is from 50 to 200 N/cm/cm on average of warp and weft.