PURPOSE: To obtain a method for adjusting gas permeability using a film having permeability enough so as not to inhibit respiration of vegetables and fruits and blocked from the outside so as to keep a gas composition capable of exhibiting CA storing effect and having strength capable of sufficiently withstanding as a packaging material for vegetables and fruits and having transparency.
CONSTITUTION: A method for controlling permeability of oxygen and carbon dioxide in a multilayer film obtained by laminating a pore-free resin layer to a perforated film is carried out by using polyethylene as a resin layer and changing thickness of the polyethylene. The method for rolling permeability of oxygen and carbon dioxide in the whole film is carried out by changing specific gravity of the polyethylene. The method for controlling permeability of oxygen and carbon dioxide is carried out using a perforated film having 5000-500000 through hole opening numbers/cm2.
TAKESHITA KOJI
NAKAGAWA YOSHIHIRO
OMOTE KIYOTAKA
IKEDA NORIO
MIYAGI MASAO
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