Method of producing polyurethane injection molded in-line skate

Details Method of producing polyurethane injection molded in-line skate Method of producing polyurethane injection molded in-line skate

1993-05-14

1994-05-17

Kight, III, John

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

152DIG18, 301 53, 301 55, 301 56, 301 59, 280 1112, 280 1119, 425542, 425549, 425554, C08J 900

Patent

active

053128443

ABSTRACT:
A method of producing injection molded in-line skate wheels is disclosed. The method includes heating an injection molding unit suitable for injecting molten polyurethane, placing a thermoplastic polyether type polyurethane into the unit and heating the polyurethane until it is molten or at about 380.degree. to about 460.degree. F. A polyurethane hub is placed in a mold whereby the mold and hub are of shapes and sizes suitable for producing in-line skate wheels. The hub-containing mold is heated to about 50.degree. to about 100.degree. F. in order to prevent the molten polyurethane from prematurely hardening. Once the mold is heated, about 46 to about 50 g of polyurethane is injected into the mold at about 75 to about 100 psi. The polyurethane is cooled to about 120.degree. to about 130.degree. F. to allow the polyurethane to harden and the resulting wheel is removed from the mold.

REFERENCES:
patent: 3689091 (1972-09-01), Nagin
patent: 4699432 (1987-10-01), Klamer
patent: 4844491 (1989-07-01), Wheelwright
patent: 4909523 (1990-03-01), Olson
patent: 5028058 (1991-07-01), Olson
patent: 5048848 (1991-09-01), Olson et al.
patent: 5133591 (1992-07-01), Skaggs et al.

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