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Four Steps of Silicone Molding

2022-11-21

1. Raw material preparation
The main materials of compound rubber products are raw rubber, compounding agent, metal material and fiber material. The raw rubber is the basic material; the compounding agent is the auxiliary material added to improve some properties of the rubber compound; Fiber) is used as the skeleton material of the compound rubber product to enhance the mechanical strength and limit the deformation of the product. In order to make the raw rubber and compounding agent mix evenly with each other, some materials need to be processed, so in the process of raw material preparation, the ingredients are accurately weighed according to the formula.

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2. Plasticizing

Raw rubber is elastic and lacks processing properties (plasticity), so it is not easy to process. In order to improve its plasticity, it is necessary to masticate the raw rubber; in this way, the compounding agent is easily dispersed in the raw rubber during mixing; at the same time, it also helps to improve the permeability of the rubber during the calendering and molding process (penetration fabric) and molding fluidity. The process of degrading the long-chain molecules of raw rubber to form plasticity is called mastication. There are two methods of plasticizing raw rubber: mechanical plasticizing and thermal plasticizing. Mechanical mastication is a process in which the long-chain rubber molecules are degraded and shortened by the mechanical extrusion and friction of the plasticizer at a temperature that is not too high, and transformed from a highly elastic state to a plastic state. Hot plasticizing is to introduce hot compressed air into the raw rubber, under the action of heat and oxygen, the long-chain molecules are degraded and shortened, thereby obtaining plasticity.

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3. Mixing
Mixing is a process in which the masticated raw rubber and compounding agent are mixed and placed in a rubber mixer, and the compounding agent is completely and uniformly dispersed in the raw rubber through mechanical mixing. Mixing is an important process in the production process of rubber products. If the mixing is not uniform, it will affect the performance of the product, and the role of rubber and compounding agents will not be fully exerted. The rubber compound obtained after mixing is called mixed rubber. It is a semi-finished material for manufacturing various rubber compound products, commonly known as rubber compound. It is usually sold as a commodity. Required rubber products.

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4. Forming
In the production process of rubber compound products, various processes of different sizes and shapes are prefabricated by extruders or calenders, which is called molding.

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