METHOD OF CO-EXTRUDING, CO-EXTRUSION DIE, AND EXTRUDED ARTICLES MADE THEREFROM
First Claim
1. A die for co-extruding at least a first extrudable polymeric composition and a second extrudable polymeric composition, the die comprising:
- a first die cavity in a first die portion;
a second die cavity in a second die portion; and
a distribution plate interposed between at least a portion of the first die cavity and at least a portion of the second die cavity, the distribution plate having a first side forming a boundary of the first die cavity, an opposing second side forming a boundary of the second die cavity, a dispensing edge, a plurality of first extrusion channels, and a plurality of second extrusion channels, with the plurality of first extrusion channels extending from entrance openings at the first die cavity to exit openings on the dispensing edge, the plurality of second extrusion channels extending from entrance openings at the second die cavity to exit openings on the dispensing edge, with the exit openings of the plurality of first extrusion channels and the exit openings of the plurality of second extrusion channels being disposed in alternating positions along the dispensing edge, wherein each of the first extrusion channels comprises two opposite side walls and a joining surface connecting the two opposite side walls, and wherein the joining surface of at least some of the first extrusion channels is substantially parallel to the first side of the distribution plate.
1 Assignment
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Accused Products
Abstract
A die comprising two die cavities, with each capable of supplying polymeric material, and a distribution plate interposed between at least a portion of each of the two die cavities. The distribution plate has a dispensing edge and a plurality of extrusion channels. First and second extrusion channels extend from entrance openings at the first and second die cavities, respectively, to exit openings on the dispensing edge. The exit openings of the first and second extrusion channels are disposed in alternating positions along the dispensing edge. A method of extruding with such a die and an extruded article made therefrom are also disclosed. The method includes co-extruding a first polymeric composition and a second polymeric composition. The extruded article comprises a plurality of longitudinal first stripes of the first polymeric composition alternating with a plurality of longitudinal second stripes of the second polymeric composition.
21 Citations
20 Claims
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1. A die for co-extruding at least a first extrudable polymeric composition and a second extrudable polymeric composition, the die comprising:
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a first die cavity in a first die portion; a second die cavity in a second die portion; and a distribution plate interposed between at least a portion of the first die cavity and at least a portion of the second die cavity, the distribution plate having a first side forming a boundary of the first die cavity, an opposing second side forming a boundary of the second die cavity, a dispensing edge, a plurality of first extrusion channels, and a plurality of second extrusion channels, with the plurality of first extrusion channels extending from entrance openings at the first die cavity to exit openings on the dispensing edge, the plurality of second extrusion channels extending from entrance openings at the second die cavity to exit openings on the dispensing edge, with the exit openings of the plurality of first extrusion channels and the exit openings of the plurality of second extrusion channels being disposed in alternating positions along the dispensing edge, wherein each of the first extrusion channels comprises two opposite side walls and a joining surface connecting the two opposite side walls, and wherein the joining surface of at least some of the first extrusion channels is substantially parallel to the first side of the distribution plate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 17, 18, 19, 20)
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15. An extruded film having first and second lateral edges and a midline, the extruded film comprising an even number of longitudinal first stripes of a first polymeric composition comprising an inelastic polymer alternating with an odd number of longitudinal second stripes of a second polymeric composition comprising an elastomeric polymer such that the longitudinal second stripes are located at least at the first and second lateral edges and at the midline, and wherein at least some of longitudinal second stripes have lines of weakness along their lengths.
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16. An extruded film having opposing major surfaces and comprising a plurality of longitudinal first stripes of a first polymeric composition comprising an inelastic polymer alternating with a plurality of longitudinal second stripes of a second polymeric composition comprising a blend of an elastomeric polymer and an inelastic polymer, wherein both the plurality of longitudinal first stripes and the plurality of longitudinal second stripes are provided with projections on at least one of the opposing major surfaces, the projections of the plurality of longitudinal first stripes being substantially the same height as the projections of the plurality of longitudinal second stripes.
Specification