Fabrication de joints étanches de fermeture

摘要

749,347. Moulding bottle cap seals. CONTINENTAL CAN CO.. Inc. May 17. 1954, No. 14320/54. Class 87(2) [Also in Group XVII] In the moulding in situ of a sealing disc for a crown closure, a sheet of rubber composition 10 having an isobutylene polymer as plasticizer is punched by a punch 11 to deliver a disc 12 into a sleeve 13 by which it is transported to a heated cap 16 presented by a holder 17 to receive the disc 12 ejected by a cold plunger 18 the heat causing adhesion of the disc to the cap which then moves to a hot plate 20 where a heated plunger 21 shapes the sealing disc. The final step of curing or vulcanization takes place in an air heated oven 30.