Method for the preparation of cylindrical members for paper...

Details Method for the preparation of cylindrical members for paper... Method for the preparation of cylindrical members for paper...

B - Operations, Transporting

32

B

B32B 29/00 (2006.01) B29C 65/00 (2006.01) B29C 65/16 (2006.01) B32B 27/10 (2006.01) B65D 65/40 (2006.01)

Patent

CA 2066717

ABSTRACT According to the present invention, there is provided a method for the preparation of cylindrical members for paper containers having a thermoplastic resin layer as their innermost layer by cylindrically forming a preform sheet composed of a laminate comprising at least a paper layer and the thermoplastic resin layer which is to become the innermost layer of the paper containers and is selected from the group consisting of polyesters and ethylene/vinyl alcohol copolymers, wherein the method comprises the steps of folding back an edge along one side of the preform sheet, putting the thermoplastic resin layer of the folded edge on that of the other edge, softening or melting the thermoplastic resin layers using carbon dioxide gas laser irradiation, and pressing the overlapped portion to seal the thermoplastic resin layers.

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