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US 11,466,138 B2Granted
Repulpable and recyclable composite packaging articles and related methods
AssigneeSmart Planet Technologies, Inc.
InventorChristopher R. Tilton
Life of this patent
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Abstract
A reusable, fiber containing pulp product is described that is highly suited for use in the manufacture of paper products. The reusable, fiber containing pulp product provides a mixture of fibers and small, dense polymer/particle fragments. The polymer/particle fragments within the reusable, fiber containing pulp product have a size range and density that facilitates efficient removal of the polymer/particle fragments using pressure screens.
Claims16
A method of manufacturing a heat sealable and recyclable packaging structure, the method comprising:
- extrusion coating released fibers with a plurality of polymer/particle fragments comprising a thermoplastic and particles, wherein the plurality of polymer/particle fragments have a mean surface area of 0.0005 mm2 to 2 mm2 and a density of 1.01 g/cm3 to 4.75 g/cm3
- wherein the extrusion process is carried out under the following conditions:
- the polymer/particle fragments resin having a melt flow index from 4 g/10 min to 16 g/10 min;
- a melt temperature from 590° F.±20%;
- an extruder screw or tube barrel pressure from 1,200 psi to 2,500 psi;
- an air gap from 4″ to 16″;
- a die gap from 0.020″ to 0.050″;
- barrel and die zone temperatures from 400° F. to 640° F.;
- and
- an extrusion lamination line speed from 100 FPM to 3,500 FPM.
7 more elements
Dependencies are inferred from the claim text.