Film, laminated sheet and methods of making same
AssigneeClopay Plastic Products Company, Inc.
InventorsLarry Hughey McAmish, Kenneth L. Lilly
Life of this patent
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Abstract
A method of making a microporous laminate sheet having a first film layer and a second layer. The first film layer includes a pore initiator and is bonded to the second layer in order to form a laminate sheet. The laminate sheet is then stretched using at least one CD intermeshing stretcher and at least one MDO stretching unit. Methods of making a microporous film is well as a microporous film laminate are also provided, along with an apparatus for stretching a film or laminate.
Claims24
A method of making a microporous laminate sheet comprising a first film layer and a second layer, comprising:
- (a) bonding a first film layer to a second layer in order to form a laminate sheet, wherein said first film layer includes a pore initiator;
- and
- (b) stretching said laminate sheet using at least one CD intermeshing stretcher and at least one MDO stretching unit.
A method of making a microporous film, comprising:
- (a) extruding a thermoplastic film from a polymer composition which includes a pore initiator;
- and
- (b) stretching said film using at least one CD intermeshing stretcher and at least one MDO stretching unit.
A method of making a microporous laminate sheet comprising at least two film layers, comprising:
- (a) bonding a first film layer to a second film layer in order to form a laminate sheet, wherein said first film layer includes a pore initiator;
- and
- (b) stretching said laminate sheet using at least one CD intermeshing stretcher and at least one MDO stretching unit.
An apparatus for stretching a film or a film/fabric laminate, comprising a CD intermeshing stretcher and a MDO stretching unit, wherein said CD intermeshing stretcher and said MDO stretching unit are arranged such that a film or film/fabric laminate may be stretched by said CD intermeshing stretcher either immediately before or immediately after being stretched by said MDO stretching unit.
Dependencies are inferred from the claim text.