The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 28, 1986
Filed:
Sep. 25, 1984
Isao Yoshimura, Fujisawa, JP;
Hideo Hata, Yokohama, JP;
Asahi Kasei Kogyo Kabushiki Kaisha, Osaka, JP;
Abstract
The present invention provides primarily an entirely new type multilayer oriented film suited for stretch wrapping, particularly for wrapping of foods. Its features include various excellent characteristics such as mechanical strength, transparency, heat resistance, sealability, stretchability, low temperature resistance, etc. In particular, the present invention concerns a process for producing such a multilayer film by cold stretching a multilayer containing at least one layer with a specific composition capable of a high degree of cold stretching, which enables simultaneously cold stretching of other layers made of resins which can be or cannot be stretched solely, through its cold stretching force, thereby imparting high strength to all the layers, and further applying a specific heat treatment on the stretched film to modify orientation of the film so as to increase stretchability and to stabilize dimension of the film.