High-moisture-permeability, microporous plastic film, and its production method and apparatus
OwnerSeiji Kagawainventor
Life of this patent
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Abstract
A high-moisture-permeability, microporous plastic film randomly having a lot of recesses having different opening diameters and depths, with clefts formed in the recesses, is produced by pressing a first pattern roll randomly having a lot of high-hardness, fine particles having sharp edges on a roll body surface to a flat-surface metal roll, to produce an anvil roll randomly having a lot of recesses on a metal roll surface; arranging a second pattern roll randomly having a lot of high-hardness, fine particles having sharp edges on a roll body surface oppositely to the anvil roll; and passing a plastic film through a gap between the second pattern roll and the anvil roll.
Claims6
A method for producing a high-moisture-permeability, microporous plastic film randomly having a lot of recesses having different opening diameters and depths, with clefts formed in said recesses, comprising
- pressing a first pattern roll randomly having a lot of high-hardness, fine particles having different sizes and sharp edges on a roll body surface to a flat-surface metal roll, to form a lot of recesses having different sizes on said flat-surface metal roll, thereby producing an anvil roll randomly having a lot of recesses having different sizes;
- arranging a second pattern roll randomly having a lot of high-hardness, fine particles having different sizes and sharp edges on a roll body surface oppositely to said anvil roll provided with a lot of recesses having different sizes;
- and
- passing said plastic film through a gap between said second pattern roll and said anvil roll so that the recesses having the different opening diameters and depths, with the clefts formed in said recesses, are formed in the plastic film by cutting or slicing by the fine particles of the second pattern roll.
Dependencies are inferred from the claim text.