Rolling mill air permeability film and the manufacturing process and the equipment of air permeability film
OwnerJae-Hun Shim, Soo Young Leeinventors
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Abstract
Disclosed is an air permeable film united with a nonwoven fabric, consisting of a polymer film having an inorganic material extruded to have a basic weight of 35 g/m2 or less and united to a partial or whole surface of a nonwoven fabric. The nonwoven fabric having a basic weight of 50 g/m2 or less is united to one surface of the extruded polymer film in a melted state, with an air permeable region centering around a drawn mark distributed to the whole surface of a nonwoven fabric-united film rolled and drawn by a press roll. A method of preparing such an air permeable film united with a nonwoven fabric and a device for preparing the same are also described.
Claims3
An air permeable film united with a nonwoven fabric, comprising
- a polymer film containing an inorganic material for use in preparation of an air permeable film, extruded to have a basic weight of 5-35 g/m2 and united to a partial or a whole surface of the nonwoven fabric;
- the nonwoven fabric having a basic weight of 5-50 g/m2, united to one surface of the extruded polymer film in a melted state;
- and
- an air permeable region centering around a drawn mark formed on a nonwoven fabric-united film rolled and drawn by a press roll,
- wherein the air permeable region is distributed to the whole surface of the film.
A device for preparing an air permeable film united with a nonwoven fabric, comprising
- an extruder for extruding a polymer containing an inorganic material for use in preparation of an air permeable film to a polymer film with a basic weight of 5-35 g/m2;
- a uniting roll for uniting the nonwoven fabric with a basic weight of 5-50 g/m2 to one surface of the extruded polymer film in a melted state;
- and
- a press roll for rolling a nonwoven fabric-united film,
- wherein the press roll comprises a draw pattern roll for forming an air permeable region centering around a drawn mark on the nonwoven fabric-united polymer film containing the inorganic material, and an elastic roll closely contacted to the draw pattern roll under pressure and rotated with the draw pattern roll for aiding a rolling of the nonwoven fabric-united polymer film containing the inorganic material.
A method of preparing an air permeable film united with a nonwoven fabric, comprising the following steps of:
- extruding a polymer with an inorganic material for use in preparation of an air permeable film to have a basic weight of 5-35 g/m2 by use of an extruder, to prepare a polymer film;
- uniting the nonwoven fabric with a basic weight of 5-50 g/m2 to one surface of the extruded polymer film in a melted state;
- and
- rolling and drawing the nonwoven fabric-united polymer film containing an inorganic material by a press roll consisting of a draw pattern roll and an elastic roll, to distribute an air permeable region centering around a drawn mark on the whole surface of the film.
Dependencies are inferred from the claim text.