초록 ▼

A flash-proof RIM mold and method of making same. The mold has a thermosetting resin squeezed and cured between the mold portions at the edge of the parting line exposed to the mold cavity. The resin fills any gaps between the mold portions resulting from mismatched surfaces. The resin adheres to on

A flash-proof RIM mold and method of making same. The mold has a thermosetting resin squeezed and cured between the mold portions at the edge of the parting line exposed to the mold cavity. The resin fills any gaps between the mold portions resulting from mismatched surfaces. The resin adheres to one mold portion and is readily spaceable from the other. A strip of uncured resin is applied to one of the mold portions, the mold closed at its operating temperature, and the resin allowed to cure to a semi-cured state. The mold is opened and any resin exuding into the mold cavity removed. After the resin has fully cured the mold is ready for use.

대표청구항 ▼

In a metal, reaction-injection-molding mold comprising first and second mating segments which, in a mold-closed position, define a cavity therebetween for receiving a liquid mixture of reactants and said first and second segments each have complimentary shaped faces which mate one with the other at

In a metal, reaction-injection-molding mold comprising first and second mating segments which, in a mold-closed position, define a cavity therebetween for receiving a liquid mixture of reactants and said first and second segments each have complimentary shaped faces which mate one with the other at a parting line having an edge exposed to said cavity, the improvement comprising an interlayer of thermosetting resin between said faces contiguous said edge and filling any gaps between said faces at said:edge so as to prevent intrusion of said parting line by said reactants and the coincident formation of flash on articles formed in said cavity, wherein said resin (a) adheres firmly to one of said faces, (b) is readily separable from the other of said faces and (c) is cured in situ between said faces when said mold is in said mold-closed position so as to provide an exposed surface thereon in the mold-open position which conforms to the topography of said other of said faces.