Document Type and Number:
Japanese Patent JPS5324862
Kind Code:
B1
Abstract:
The U shaped reinforcing strips are continuously sealed onto the edges of a continuously moving film whereby the strips are continuously separated from film wider than the width of two strips, is folded over and then applied to the cut edges of the film acc. to parent patent, in which two adjacent strips are cut out of the middle of the upper and lower walls of a tube, they are folded into U shapes and then applied to the cut edges of the remaining half tubes.
Application Number:
JP4759272A
Publication Date:
July 24, 1978
Filing Date:
May 13, 1972
Export Citation:
International Classes:
B31B19/86; B31B70/00; B31B160/10; (IPC1-7): B31B23/74; B31B1/86