Patent ID: 6066226
Filing Date: 2000-05-23
Classification: B29C,B29L,B32B,B65D,Y10T

Abstract:
A method of making a sheet-shaped oxygen absorber comprising:preparing an oxygen-absorbing resin sheet having opposed first and second surfaces and including an oxygen-absorbing composition in a thermoplastic resin;applying first and second covering members to and in contact with the first and second surfaces, respectively, of the oxygen-absorbing resin sheet to form a laminated structure, at least one of the covering members being air-permeable; andultrasonically heat sealing the first covering member to the second covering member by applying ultrasonic energy to the laminated structure and, along the periphery of a closed planar geometric figure smaller in area than the oxygen-absorbing resin sheet and the first and second covering members to encapsulate a part of the oxygen-absorbing resin sheet between the first and second covering members, and cutting the oxygen-absorbing resin sheet and the first and second covering members so that the first and second covering members are sealed to each other along the periphery of the closed planar geometric figure to produce a sheet-shaped oxygen absorber in which the oxygen-absorbing resin sheet is not exposed at edges of the sheet-shaped oxygen absorber.