Method of making EVA shoe midsole

Details Method of making EVA shoe midsole Method of making EVA shoe midsole

1991-12-12

1993-01-12

Sewell, Paul T.

Boot and shoe making

Processes

Miscellaneous parts

36 32R, 12146B, 264 55, 264 453, A43D 1304, B29D 2700

Patent

active

051778246

ABSTRACT:
A method of making EVA shoe midsole includes a compound containing in percentage by weight the substancessuch as 100% of ethylene vinyl acetate (EVA) into which 5-40% of filling agent, 1-10% of foaming agent, 0.5-3% of bridging agent, 0.5-5% of finishing aid, 0.1-1% of foaming aid and coloring agent are added. Such compound is made into particles to be injected into the primary mold in which the preliminary blank of midsole is formed. The preliminary blank is made to foam to take shape of a molded blank under heat and pressure so as to ensure that the size of the molded blank corresponds to that of the midsole intended to be made. The molded blank is then treated in the secondary mold under heat and pressure and is subsequently cooled to take form of the midsole intended to be manufactured.

REFERENCES:
patent: 4159294 (1979-06-01), Oishi et al.
patent: 4314954 (1982-02-01), Ringdal
patent: 4559190 (1985-12-01), Quintavelle et al.
patent: 4627178 (1986-12-01), Sullivan et al.
patent: 4694589 (1987-09-01), Sullivan et al.
patent: 4877814 (1989-10-01), Ito
patent: 4919866 (1990-04-01), Kubbutat

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