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.
Claims15
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;
- said recesses having an opening diameter distribution in a range of 60-300 μm and a depth distribution in a range of 10-100 μm;
- and
- 50% or more of said clefts being formed in boundary regions between the bottoms and sides of said recesses, thereby having moisture permeability of 100-7000 g/m2·24 hr·40° C.90% RH.
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 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 surface of said metal roll;
- arranging a second pattern roll randomly having a lot of high-hardness, fine particles having sharp edges on a roll body surface oppositely to said anvil roll;
- and
- passing said plastic film through a gap between said second pattern roll and said anvil roll.
An apparatus 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, comprises
- a pattern roll randomly having a lot of high-hardness, fine particles having sharp edges on a roll body surface;
- an anvil roll arranged oppositely to said pattern roll;
- a conveyor roll for passing a plastic film through a gap between said pattern roll and said anvil roll;
- and
- a means for adjusting the gap between said pattern roll and said anvil roll;
- said anvil roll being randomly provided with a lot of recesses on the surface.
Dependencies are inferred from the claim text.