초록 ▼

A method and apparatus associated with plastics material applied by injection moulding to a metal substrate by surrounding at least a portion of the substrate with a mould and injecting flowable plastics material into the mould, characterized in that the method and/or the apparatus utilizes locally

A method and apparatus associated with plastics material applied by injection moulding to a metal substrate by surrounding at least a portion of the substrate with a mould and injecting flowable plastics material into the mould, characterized in that the method and/or the apparatus utilizes locally induced heat in the portion of the metal substrate surrounded by the mould to bond and sealingly adhere the plastics material to the metal substrate in total surface-to-surface contact.

대표청구항 ▼

A method of forming a closure member in a metal container comprising the steps of providing a metal container end having opposite surfaces and an aperture therethrough of a predetermined size and peripheral outline, providing a mould formed of two dies each having a cavity of a predetermined size an

A method of forming a closure member in a metal container comprising the steps of providing a metal container end having opposite surfaces and an aperture therethrough of a predetermined size and peripheral outline, providing a mould formed of two dies each having a cavity of a predetermined size and peripheral outline larger than the predetermined size and peripheral outline of the aperture and at least one of the dies having a die portion transparent to electromagnetic energy, clamping the metal container end between the dies with the aperture in general alignment with the die cavities and proximate the die portion thereby exposing to each cavity and the die portion a peripheral edge portion of the metal container end contiguous the aperture, injecting flowable plastics material into the cavities and the aperture therebetween, generating electromagnetic energy exteriorly of the cavity so as to transmit the same through the die portion, and thereby effect localized induction heating of only the aperture peripheral edge portion during the injection step to sealingly adhere the plastics material to the opposite surface at the peripheral edge portion thereby forming a closure member in the container end. Apparatus for injection moulding a plastics material onto a metal substrate comprising first and second dies between which a metal substrate is adapted to be disposed when said dies are closed, at least one of said dies including means for defining a cavity of a predetermined peripheral outline exposed to and opening in a direction toward a predetermined surface portion of the metal substrate which is to be coated with plastics material, means for injecting plastics material into said cavity in conformity therewith and against said predetermined surface portion, at least one of said dies being defined in part by a die portion transparent to electromagnetic energy, and means for generating electromagnetic energy exteriorly of said cavity approximate said die portion and transmit the same through said die portion to thereby effect localized induction heating of the predetermined surface portion during the injecting of the plastics material into said cavity.