Injection Molding Rubber Compounds

Rubber injection molding is used to develop both solid rubber parts and rubber to metal bonded products.

Injection molding rubber compounds.

Rubber injection molding successfully alters the plastics process by heating the rubber and placing it under significantly more pressure per square inch of cavity surface in molding. Rubber injection molding in this process the uncured rubber compound is heated to a liquid state before being injected into a mold. Starting with the right rubber compound natural or synthetic rubbers elastomers are compounded with additives to meet design use specifications and or ease of processing. Once filled the rubber is heated within the mold to complete its cure cycle.

Epdm rubber compounds have good resistance to mild acids detergents alkalis silicone oils and greases ketones and alcohols. Injection molding of rubber was originally an offshoot from the plastics industry in the early 1960s. High consistency rubber hcr silicone injection molding requires special considerations to manufacture quality parts the selection of the press mold design and gate design are integral to success. And injection molding experiments where the basic characterization of rubb er compounds allowed the pr ediction of the pressure developm ent during molding and the state of cure in molded rubber.

Hcr silicone processing poses unique challenges when compared with organic polymer based rubber compounds. The rubber injection molding process works by significantly heating the rubber and using a very high pressure to inject the rubber compound in to the mold. For injection molding the rubber compound is heated to a low viscous and flowing state. Based off of a process intended for the molding of plastics injection molding of rubber began in the mid 1960s.

The product is released by opening the mold and closing it again to receive the next injection. After overcoming the initial issues of temperature plastics are cooled when molding and rubber is heated and pressure rubber injection molding requires. The rubber molding operation brings together all three elements of the process mentioned above and so is the most critical point in the process. These compounds are used frequently to seal in brake systems and for sealing hot water and steam.

Epdm rubber epdm rubber compounds are prepared from ethylene and propylene epm and usually a third monomer epdm. For automotive production the preferred method of molding is by injection.