Title:
METHOD FOR CONTROLLING GAS PERMEABILITY
Document Type and Number:
Japanese Patent JP3328978
Kind Code:
B2
Abstract:
PURPOSE: To provide a method for controlling gas permeability by using a film having such a sufficient gas permeability as not inhibiting the respiration of vegetables and fruits, shutting off outside air to the extent of maintaining a gas composition exhibiting a CA-preserving effect, having a strength sufficiently durable as a packaging material for the vegetables and fruits, and having good transparency.
CONSTITUTION: The method for controlling the gas permeability of a multi- layered film produced by laminating a non porous resin layer to a polymethylpentene film comprises using polyethylene for the nonporous resin layer to control the oxygen and carbon dioxide permeability of the whole film. As embodiments, a method for controlling the gas permeability comprising controlling the oxygen and carbon dioxide permeability of the whole film by changing the thickness of the polyethylene, and a method for controlling the gas permeability comprising controlling the oxygen and carbon dioxide permeability of the whole film by changing the specific gravity of the polyethylene.
Inventors:
Koji Takeshita
Yukie Yamamura
Tomatsuri Strong
Omote Kiyotaka
Yoshihiro Nakagawa
Yukie Yamamura
Tomatsuri Strong
Omote Kiyotaka
Yoshihiro Nakagawa
Application Number:
JP893593A
Publication Date:
September 30, 2002
Filing Date:
January 22, 1993
Export Citation:
Assignee:
Toppan Printing Co., Ltd.
International Classes:
A23B7/00; A23B7/148; B65D65/40; B65D81/26; B65D85/50; (IPC1-7): A23B7/148; A23B7/00; B65D65/40; B65D81/26; B65D85/50
Domestic Patent References:
| JP4202437A | ||||
| JP259768B2 |