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What are the steps in the injection molding process of liquid silicone rubber?

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What are the steps in the injection molding process of liquid silicone rubber?

Liquid silicone rubber injection molding is a commonly used silicone processing technology, mainly used to manufacture various silicone products, such as seals, keyboards, handles, etc. The specific steps of liquid silicone rubber injection molding will be introduced below.

Firstly, preparation work is very important. Firstly, it is necessary to prepare the required silicone material, usually choosing liquid silicone rubber with good fluidity and heat resistance. In addition, it is necessary to prepare molds and injection molding machines.

The second step is mold preparation. The design and manufacturing of molds are key to injection molding. Firstly, design a suitable mold structure based on the product's requirements. Then, use tools such as CNC to process the mold material into the desired shape. During this process, attention should also be paid to the surface smoothness and accuracy of the mold to ensure the quality of the final product.

Next is the preparation of silicone material. Pour the required liquid silicone rubber into the hopper of the injection molding machine and set parameters such as temperature and pressure. Before injecting silicone, it is necessary to perform defoaming treatment on the silicone to remove any bubbles, in order to avoid affecting the quality of the product.

Once the silicone material is ready, injection molding can proceed. Align the nozzle of the injection molding machine with the feed port of the mold, start the injection molding machine, and inject silicone into the mold. During the injection process, it is necessary to control the injection speed and pressure to ensure that the silicone gel fills the entire mold and does not produce bubbles or other defects.

After the injection is completed, it is necessary to wait for the silicone gel to fully solidify. This process usually requires a certain amount of time, depending on the type and thickness of the silicone gel. During the curing process of silicone, the curing speed can be controlled by heating or cooling.

Finally, after curing is completed, the mold can be opened to take out the formed silicone product. Before removal, it is necessary to inspect the surface of the product for defects or foreign objects, and clean and repair it. If any problems are found, they need to be repaired or remade.

In general, the liquid silicone rubber injection molding silicone process includes preparation work, mold preparation, silicone material preparation, injection molding, silicone curing, and finished product removal. Each step requires careful operation and control to ensure the quality and performance of the final product. This process has broad application prospects in the production of silicone products.


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