| 摘要 |
A filter for a gas generator in which the manufacture is simple, which has an adequate filter performance and cooling performance and, furthermore, which has high reliability with little damage caused in actuation of the gas generator, is provided. The filter for an air bag gas generator comprises a first layer formed from helically wound wire rods having a cross-sectional area of 0.03 to 0.8 mm<SUP>2</SUP>, in such a way that the pitch angle of wire rods vertically superposed in the radial direction is symmetrical, and a second layer that exists on the outer side of the first layer in the radial direction and is formed to have a finer filter particle size than the first layer using a wire rod narrower than the wire rod that forms the first layer.
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