Uncoated air bag fabric
AssigneeToyo Boseki Kabushiki Kaisha
InventorsMamoru Kitamura, Tatsuo Konishi
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Abstract
A compact, economical air bag fabric of low air permeability and light mass (METSUKE) is realized by a thermoplastic fiber fabric having a distribution of pores formed by the fibers constructing the fabric, that is, the pore distribution of 2.0 or smaller and air permeability of 2.5 L/cm2/min or lower. By setting a permeating deformation index PI of the thermoplastic fiber to 0.1 to 0.6 and the air permeability of the fabric at the differential pressure of 20 kPa to 1.0 (L/cm2/min) or lower, an economical uncoated air bag fabric of which air permeability is low but increases under the high differential pressure condition in the latter period of development is obtained.
Claims6
An uncoated air bag fabric made of thermoplastic fiber, wherein a pore distribution value (PD) expressed by equation (1) of pores formed by the thermoplastic fiber is 2.0 or smaller and air permeability at differential pressure of 20 kPa is 2.5 (L/cm2/min) or lower.
- PD=(FDmax−FDmin)/FDave (Equation 1)
- FDmax:
- maximum pore size (μm)
- FDmin:
- minimum pore size (μm)
- FDave:
- average flow rate pore size (μm)
An uncoated air bag fabric made of thermoplastic fiber, wherein a permeating deformation index (PI) expressed by equation (2) of the thermoplastic fiber is in a range from 0.1 to 0.6 and air permeability of the fabric at differential pressure of 20 kPa is 1.0 (L/cm2/min) or lower.
- PI=M(3)×(Den×ρ/f)1/2 (Equation 2)
- M(3):
- tensile resistance value (g/d) of the fiber of the fabric at 3% elongation
- Den:
- denier (d) of the fiber constructing the fabric
- f:
- the number (pcs) of mono filaments of multi filaments constructing the fabric
- ρ:
- density of thermoplastic fiber (g/cm3).
Dependencies are inferred from the claim text.