Apparatus and method of producing polyurethane rubber bands

Details Apparatus and method of producing polyurethane rubber bands Apparatus and method of producing polyurethane rubber bands

2006-02-07

2006-02-07

Del Sole, Joseph S. (Department: 1722)

Plastic article or earthenware shaping or treating: apparatus

With interposed non-adhering web or sheet type parting means

C425S092000, C425S297000, C425S384000

Reexamination Certificate

active

06994534

ABSTRACT:
An apparatus and method of producing polyurethane rubber bands. The apparatus includes a first device for heating and simultaneously drawing a polyurethane sheet produced by incising polyurethane tubular film obtained according to an inflation procedure, a second device for coating a release agent onto both sides of the drawn polyurethane sheet and drying the release agent-coated polyurethane sheet, a third device for longitudinally fine-cutting the dried polyurethane sheet using fine-cutting rollers to form several tens of strips of polyurethane rubber bands, depositing starch or talc powder on both sides of the polyurethane rubber bands, and heat-processing the polyurethane rubber bands deposited by the starch or talc powder, a fourth device for dispersing the heat-processed polyurethane rubber bands to impartially stuff the polyurethane rubber bands into packing receptacles, and a fifth device for heat-aging the packed polyurethane bands in an aging compartment.

REFERENCES:
patent: 2913773 (1959-11-01), Hassel
patent: 3936254 (1976-02-01), Sawada et al.
patent: 5686186 (1997-11-01), Enlow et al.
patent: 6235409 (2001-05-01), Serafin et al.
patent: 6296732 (2001-10-01), Enlow et al.

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