Hot Press Machine for Rubber Molding Process

Rubber molding is one of three methods for making rubber; once the rubber compound is formed it needs to be made into its final product. This is accomplished by adding pressure and heat to vulcanize the rubber. In vulcanization methods this guide will cover various press commonly used to Hydraulic Hot Press Rubber. Press vulcanization supplies pressure and heat to the press. A very simple mold consists of two metal plates with cavities that conform to form the outer shape of the desired finished part.

The press hydraulically vulcanizes the rubber by heating the plates with electric steam or hot oil. Molding processes can be classified under three broad headings: transfer molding, compression is molding, and injection molding. Compression molding involves placing well-shaped un-branched stock in each cavity of the mold; a cavity is void where the rubber will fill to form the shape of the finished product.

Hydraulic Hot Press Rubber

The mold is then closed and maintained at a fixed temperature for a certain period of time. Under pressure and heat the stock will flow and fill the cavity, with a small amount of excess volume flowing out of the special grooves. This excess is known as a mold flash. From the cavity at the end of the curing time the press is opened and the Hydraulic Hot Press Rubber product is removed. The challenge with compression molding is that it is necessary to accurately cut or weigh enough stock for each cavity. Too little stock or incorrect placement can result in defects such as flow lines, blisters, or unfilled parts.

Excessive amount of rubber can cause heavy flash that is difficult to remove. Additional challenges are now fixing cycles and require more labor to load and unload the mold. Transfer molding differs mainly from compression molding, with the stock being transferred through holes in the mold cavity. In its rudimentary form, a transfer mold consists of a plunger, a cylinder (pot), and a mold cavity. A piece of unvaccinated stock placed in the pot and covered by a piston. The piston then pressurizes the rubber with additional heat to force the stock through a hole in the mold cavity.

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After the mold is cured the mold is separated and the cavities are vented. All transfer moldings leave a flash pad between the piston and the pot, which is thrown away, this additional cost can be reduced by shorter curing times and the cost of stock preparation can be reduced as many cavities are stocked. Can be filled with a piece of paper. Similar to transfer molding Injection molding is that the rubber stock is forced into a closed mold cavity by the nozzle.

Which is masticated and pushed A strip of rubber stock is fed into the Hydraulic Hot Press Rubber through a large screw. Typically the screw fills a ram and then a piston ejects the ram into the mold cavity with rubber. This process significantly reduces the curing time and can be cheaper than compression and transfer molding. In our next guide we will cover other ways to bring the rubber compound into the finished product by Hydraulic Press Machine Manufacturer: extrusion, die-cut sheet rolling, open vulcanization, and continuous vulcanization.