Patent ID: 6324760
Filing Date: 2001-12-04
Classification: B60R,Y10T

Abstract:
A method of manufacturing a gas generator for an airbag, said gas generator including a housing having gas discharge ports and a gas generating agent stored in said housing, comprising the steps of:preparing a moisture-proof seal tape for preventing said gas generating agent stored in said gas generator from absorbing moisture, said seal tape having a substrate and an adhesive; andattaching said moisture-proof seal tape over said gas discharge ports,wherein said seal tape has a water vapor permeability with which a rate of increase in weight due to moisture absorption by said gas generating agent is not higher than 0.05% per day, the rate of increase in weight being obtained by, preparing a container, having a predetermined content volume, formed of a material having substantially 100% moisture-preventive property, and with no substantial chemical changes and no expansion thereto based on temperature and humidity, the container including at least a lid, which can be closed air tight and having a circular hole formed therethrough, a container body, attaching the moisture-proof seal tape over the circular hole of the lid while uniformly applying a pressure to a surface of the tape, providing a known weight of gas generating agent, and filling the container body with said gas generating agent, attaching the lid to said container body to close said container, placing the closed container for 5 days to 25 days in an atmosphere having a temperature of about 80.degree. C. and a humidity of about 90%, subsequently disassembling said container, measuring the weight of the gas generating agent therein, and calculating the rate of increase in weight per day of said gas generating agent.