Airbag Woven Fabric Coating for Flexibility and Air Permeability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current woven fabrics for airbags face challenges in achieving low cost, excellent accommodability, and satisfactory air permeability while maintaining heat resistance and flame retardancy, with existing solutions either being costly or compromising on air permeability.
Innovation Solution
A synthetic fiber woven fabric with a specific coating of a polyamide-based resin, containing a soft segment and a hard segment, applied in a controlled manner to ensure air permeability and accommodability, with a resin film selectively present at the border between weaving yarn parts, optimizing the resin's thickness and distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a woven fabric is coated with synthetic rubber to improve heat resistance and flame retardancy, then heat resistance and flame retardancy are improved, but mass increases and flexibility deteriorates
Solution Approach 1:
The patent applies local quality by differentiating the resin film thickness between two locations: the weaving yarn part (minimal or no coating) and the border part (thicker coating). This localized differentiation allows the fabric to maintain flexibility in the yarn regions while achieving adequate heat resistance and flame retardancy at the border regions where coating provides the necessary protective function.
2Reliability
If a woven fabric is coated with synthetic rubber to improve heat resistance and flame retardancy, then heat resistance and flame retardancy are improved, but manufacturing cost increases
Solution Approach 1:
The patent reduces manufacturing cost by applying the resin coating selectively rather than uniformly across the entire fabric surface. By limiting the coating to the border part with thickness of 2-30 μm while minimizing or eliminating coating on the weaving yarn part, the total resin consumption is reduced, thereby lowering material costs while still achieving the required flame retardancy and heat resistance performance.
3Weight of stationary object
If a woven fabric is coated with synthetic resin to reduce weight and cost, then weight is reduced and cost is saved, but air permeability deteriorates
Solution Approach 1:
The patent resolves the air permeability issue by implementing local quality differentiation in coating distribution. The weaving yarn part is coated minimally or not at all, preserving the natural porosity and air permeability of the yarn structure. The border part receives a thicker coating (2-30 μm) that provides necessary protective functions. This selective coating approach maintains adequate air permeability for human body constraining performance while achieving weight reduction and cost savings compared to uniform coating.
Data Source
AI summary
A woven fabric for an airbag includes a synthetic fiber woven fabric having a cover factor of 2000 to 2500 in which at least one side thereof is coated with a synthetic resin. Air permeability of the woven fabric under a pressure difference of 100 kPa is 0.01 to 1.00 L/cm2/min. A resin film is present at an upper part of a single yarn at a thickness of 2 μm or less on a central cross section of a weaving yarn part. A resin film is present at an upper part of a single yarn at a thickness of 2 to 30 μm on a cross section at a border between weaving yarn parts. The synthetic resin can be a polyamide-based resin that includes a polyether compound of a number average molecular weight of 100 to 5000 as a soft segment.