ABSTRACT
Molding Both injection and compression technologies may be used for molding rubber closures. The choice depends on the technical requirements and characteristics of the products.
The rubber preforms are heated under high pressure in multicavity molds. During this process the rubber vulcanizes. In the vulcanization process, by the use of cross-linking agents that are contained in the rubber compound, chemical bonds are formed between individual polymer molecules that form the elastomeric base of the rubber. It is only at the stage of molding that the rubber turns from a plastic into an elastic material, and that it acquires its required shape in the form of a vial stopper, of a plunger for a cartridge or a prefilled syringe, or of any other geometrical form that is intended to shape the rubber in.
