| abstract |
PROBLEM TO BE SOLVED: To provide a method for heat-sealing a sheet including a film layer containing a polyolefin resin as a main component. SOLUTION: A surface treatment layer containing a thermoplastic resin is brought into close contact with a film layer containing a resin blend containing a styrene-based copolymer resin in a mass ratio of 100: 5 to 100 with a polyolefin resin. Contains an organic solvent for dissolving, partially dissolving or swelling the styrenic copolymer resin in a coating solution for applying a thermoplastic resin, and forming an styrenic copolymer at an interface between the resin blend film layer and the surface treatment layer. Using a surface-treated sheet on which an adhesive layer is formed with a polymer resin and a thermoplastic resin for a surface-treated layer, at least one portion thereof is overlapped on the same sheet or another sheet, or a part of a different kind of article, Are bonded by heat fusion bonding, for example, high frequency fusion. [Selection] Fig. 6 |