Zoned elastic film and laminates comprising the same
AssigneeKimberly-Clark Worldwide, Inc.
InventorJose Augusto Vidal De Siqueira
Life of this patent
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Abstract
The purpose of the present invention is to apply a first and second polymer composition that have different melt flow indexes in a zoned fashion onto an elastic film wherein the first polymer composition in the first zone is nonbonded to a nonwoven material and the second polymer composition in the second zone is bonded to the nonwoven material.
Claims20
An elastic film having a width dimension, a length dimension, a surface area, a machine direction (MD) and a cross-machine direction (CD), the film comprising:
- a. a first MD orientated zone having a first width dimension and comprising a first polymer composition having a first melt flow index;
- and
- b. a second MD orientated zone having a second width dimension disposed immediately adjacent to the first MD orientated zone in the CD and comprising a second polymer composition having a second melt flow index;
- wherein the first width dimension and first melt flow index are different from the second width dimension and second melt flow index.
A nonwoven composite comprising:
- a. an elastic film having a machine direction (MD) and cross-machine direction (CD), a first MD orientated zone comprising a first polymer composition and a first melt flow index;
- and a second MD orientated zone disposed immediately adjacent to the first MD orientated zone in the CD and comprising a second polymer composition and a second melt flow index;
- wherein the first and second polymer compositions and first and second melt flow indexes are different;
- and
- b. a nonwoven web material that contains fibers.
A method of coextruding copolymer compositions into an elastic film, comprising:
- a. supplying a first polymer composition having a first melt flow index (MFI) to a first inlet of a coextruder body;
- b. supplying a second polymer composition having a second melt flow index (MFI) to a second inlet of a coextruder body, wherein the MFI of the first polymer is different than the MFI of the second polymer;
- c. flowing the first and second polymer compositions through a first and second zone passing through the body to a converged output of the polymer compositions, wherein the first flow zone has a first width dimension and the second zone has a second width dimension;
- and
- d. outputting the converged output from the body to form the edge laminated film continuous across a full width of the film wherein at the converged output the first zone has a caliper greater than the caliper of the second zone.
Dependencies are inferred from the claim text.