公开(公告)号：US10427377B2

公开(公告)日：2019-10-01

申请号：US15859229

申请日：2017-12-29

Applicant: TOPPAN PRINTING CO., LTD.

Inventor： Shunsuke Yajima ,  Akira Yoshifuji

IPC: B32B5/14 ,  B32B27/36 ,  B32B1/02 ,  B32B27/16 ,  B65D75/26 ,  C08J5/18 ,  B29C71/02 ,  B65D65/14 ,  C08J7/12

Abstract: A film having heat sealing properties, a packaging bag using the film and a method of imparting heat sealing properties to the film are provided. The film is made up of a single layer of biaxially stretched polyester or made up of a laminate including the layer of biaxially stretched polyester at a surface. The layer of biaxially stretched polyester includes a non-sealing portion having no heat sealing properties, and a sealing portion having heat sealing properties due to irradiation of laser light and exhibiting lower crystallinity compared to that of the non-sealing portion.