Rubber compression molding press

Latex rubber can be poured like polyurethanes, but they generally are only poured in thin sheets. Even thicker sheets such as Linatex require a very long cure time. Pouring is the method of choice for cast polyurethanes. Normally, rubbers require a compression molding press or injection molding machine to produce parts. This has high capital and mold costs. 

This process is a take-off from compression molding that uses solid material male and female matching mold halves. This unique process uses a precision-made, solid shaped heated cavity and a flexible plunger that is usually made of hard rubber or TS polyurethane. This two-part system can be mounted in a press, either hydraulic or air-actuated. Rather excellent product qualities are possible at fairly low production rates. The reinforcement can be positioned in the cavity and the liquid TS resin is poured on it. Also used are prepregs, BMC, and SMC. 

In cavity-compression molding the cold powder or mold material is placed under pressure in a heated mold. The process is also called hot pressing. Glass-fiber-reinforced, unsaturated polyester resins are processed by the heated-cavity-compression molding method. The vulcanization of rubber can also be carried out using this method. High-fidelity records are pressed out of the thermoplasts PVC or poly(ethylene-co-vinyl acetate), while cheaper records are injection molded. 

Press-verfahren, n. pressing process molding technic, -vulkanisation, /. Rubber) press cure, -walze,/. press roll, -ziegel, tn, pressed brick, -zucker, m. compressed sugar. 

A suitable metal primer was applied to the steel. After drying the primed steel received the adhesive coat. When the rubber parts were post cure bonded, they also received the adhesive coat after degreasing with tetrachloroethylene. Three metal strips were aligned with two rubber parts, compressed by 10 to 15 percent, and cured in an air circulating oven for 90 minutes at 280°F. (Fig. 2.) Vul-canized-in-place samples were prepared in a similar manner. However, the rubber did not receive an adhesive coat. The rubber and the coated metal strips were aligned in a mold and cured in a press for 30 minutes at 300°F. 

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