Few Interesting Facts About The Process Of Rubber Moulding

Rubber was originally a natural product that can be obtained from the latex of the rubber trees. But now rubber is also produced artificially from petrochemical products, due to the huge demands of the rubber products. The natural rubber is used for making doctors’ gloves, balloons and other soft rubber products; while the artificial rubber is relatively hard and used for creating shoes, belts, pipes, friction tapes, adhesives and insulating covers of electric wires as well as in many other industrial purposes.

rubber moulding

Rubber Moulding

{ Read More: The Rubber Molding Service With The Right Service Provider }

Hence, the productions of these rubber products require following the proper rubber moulding procedures, to turn the galvanized rubber into different forms. But it is essential to have knowledge about the steps needed for completing the whole procedure in a domestic range, as the large industrial applications require huge scale of this operation. The small scale industries also try to use these simple steps for moulding of the rubber.

Important information about the process of rubber moulding

  • The whole process of rubber moulding actually starts by creating a mould from a special kind of hard rubber, in the shape of the article that is supposed to be created and this mould is placed within a definite boundary, to avoid spilling of the liquidized rubber all over the place. Then the pores of the rubber molds are sealed, after taking out the model object from it. Finally, the liquid rubber is poured into the mould and mixed well throughout the molds. After this rubber solidifies to form the desired object, its solidity is checked by prodding with a thin stick and the process is completed by taking it out of the mould.
  • There are different types of moulding procedures; namely Injection moulding, Compression moulding and Transfer moulding. The liquid rubber is passed through an injection type nozzle, from the injection barrel to the closed molds in a heated state. Silicone rubber is generally used for this type of moulding, due to its nature of high flexibility that is required to pass it through the high pressure zone of the injection nozzle. This high pressure is used to push the Silicone rubber also known as ‘Gum stock’, through the channels of the molds to its main cavity, to finally form the desired rubber product.
  • The operation of the Compression moulding is the easiest form of thermal moulding of the rubber, due to the availability of the moulds in several shapes and sizes. The moulds are squeezed to get rid of the air from the cavities of these moulds, which are filled with untreated form of rubber. The final rubber products undergo vulcanization process, after taking them out of the moulds.
  • The products made from Transfer moulds are usually cheaper than those created through Compression moulding. In the process of Transfer moulding, the liquid rubber is first placed into a specially placed transfer pot over the rubber mould, from where the rubber is pushed to the cavities of the closed mould, through a piston operation. These rubber products are also vulcanized under tremendous heat and pressure, after taking them out of the moulds.
  • Liquid Injection moulding is much similar to the procedure of simple Injection moulding of the rubber. Here, the liquid Silicone rubber is placed into two separate containers and a platinum catalyst is placed in one container. The liquid Silicone of these two containers are then mixed together and passed into the injection barrels, from where this mixture is injected into the closed moulds. This procedure is specially used for making large amounts of molded and vulcanized rubber products. Hence, the Silicone rubber items used for medical treatments are produced by this process as there is no chance of any contamination from the human contact with the rubber products, throughout the whole process.
rubber molds

Rubber Molds

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