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The Process of Rubber Molding

Started by hariharan, Jul 28, 2008, 02:03 AM

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Rubber molding is a molding process that produces a useable rubber product. Rubber products are made from uncured rubber or elastomers. An elastomer is any material with sufficient resilience or memory for returning to its original shape in response to pressure or distortions. Rubber and elastomers can be derived from natural sources, although they are mostly synthetic, produced through highly controlled chemical processes.

Rubber is an excellent material for situations that require a material to expand and return to its original shape. Specific industries that benefit from custom molded rubber are automobile, appliance controls, lawn and garden, sporting goods, medical, electrical, government and recreational. These industries and others benefit from many different products that can be created with this process.

Rubber molding creates molded rubber parts by pressing a block of rubber into a Rubber moldingmetal cavity. The rubber is then exposed to heat, activating a chemical reaction. While there are variations in specific methods, all rubber manufacturers use heat and pressure method to form molded rubber products. The three most common methods in the rubber molding process are injection molding, compression molding and transfer molding. They all involve pouring liquid rubber material into a mold where it is cured in an oven and cooled. Some examples of molded rubber parts include rubber grommets, tubes, shock mounts, stoppers, hoses, bumpers, washers, gasket and seals. Foam rubber goods are also significant due to their many applications.

It is better to incorporate the following rubber molding design guidelines while doing so.

?    Sharp corners are allowed as the material is flexible.
?    It is better to avoid overly complex shapes but it can be done for a wide variety of simple or bit complex 2D or 3D shapes.
?    It is mostly suitable for gaskets, hose adapters, o-rings, hydraulics and pneumatics, medical and dental products, geophysics, appliances, electronics, electrical parts, buttons, handles, knobs, appliance housings containers and any other part which requires flexibility.
?    Rubber molding offers many advantages as it is of low cost that leaves behind no gate or ejection marks.

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Common Terms Related to Rubber Molding

Abrasion Resistance - A rubber compound's capability to withstand mechanically caused deterioration.

Accelerated Life Test - A test made to replicate in a short period of time the breakdown resulting from normal working conditions.

Accelerator - A substance that increases the speed of vulcanization when used in small quantities in conjunction with vulcanizing agents.

Activator - A compound used to increase the effectiveness of an accelerator, small amounts at a time.

Adhesion - Tendency of rubber to cling or bond to any surface it contacts.

Aftercure - The continuance of vulcanization, even after the energy source has been taken away.

Air Checks - Depressions and marks on the surface of rubber, caused by air trapped during the molding process.

Autoclave - Uses steam under pressure to vulcanize rubber products.

Backrind - A defect in the molding process, where the rubber near the parting line sinks below the surface and the parting line ends up ragged and torn.

Batch - The result of a mixing operation.

Blank - Rubber compound that fills a mold.
I have here some information about Common Terms in molding rubber... I hope you like it guys...



the rubber molding can be used in many ways

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