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Rubber Molding Techniques
At Tamor SMR Ltd various technologies are used to vulcanize the rubber.
Injection Molding involves heating the rubber compound in the barrel of an extruder and injecting the fluid material into the mold cavity. This process is very similar to plastic injection pressing. Typical items include high quantity small products weighing between a few grams to one kilogram. Cycle time is short and the injection presses and the molds are expensive.
Transfer Molding requires building a "piston and cylinder"-like device in the mold and squirting the rubber into it through small holes. The mold is then closed and under hydraulic pressure the rubber or plastic is forced through a small hole into the cavity where it cures.  Transfer molding is used for heavier rubber parts or in places where it is desirous to shorten the cycle time and produce rubber with uniform properties.  Transfer molds are more expensive than the ones used in compression molding.

Compression Molding is the classic rubber vulcanization method. A defined excess amount of the bulk rubber compound is placed in the cavity of the mold. Using increased pressure and temperature, the rubber compound is formed. It is the excess material in the cavity that provides the required pressure. Molds are simple and help in studying shrinkage of rubber and producing first samples of various rubber compounds.  This method is generally the most suitable way for low and medium sized serial production.
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