Oct. 25, 2019
Silicone products are made of general solid rubber. The production process is divided into two types. One is solid compression vulcanization molding, and the other is liquid injection molding.
Now we will look at the production process of silicon compression vulcanization molding. The production process mainly includes:
Raw material preparation → rubber mixing → cutting → compression molding→ roasting→ inspection → De-flash→ Surface treatment →inspection → packaging.
1. Raw material preparation
The silicone raw materials purchased are all in blocks, usually milky white. At this time, the raw material cannot be directly subjected to compression molding, and it is necessary to add a vulcanizing agent (ripening agent). In the preparation of raw materials, the ingredients must be weighed according to the formula. In order to make the raw rubber and the compounding agent evenly mix with each other, it is necessary to process some materials (for example, the products include: color, luminous, fluorescent, fluorescent powder, conductive, etc., and special requirements such as adding color masterbatch are required.)
2. Rubber Mixing
According to the product requirements, the raw materials and the vulcanizing agent and other additives required are put together, and the rubber mixing machine is mixed. The general rubber mixing time is about 30 minutes (depending on the weight of the rubber raw materials and the roller gap)
The prepared silicone material is cut the proper size. Place the cut raw materials on the shelf for a period of time. Leaving it for around 8 hours. (PE film protection on both the front and back sides of the raw materials to ensure the cleanliness).
4. Compression Molding
After molding, Place the cut rubber in the mold, heating, venting, holding, and molding.
Inspect after molding, if it is dirty or missing edge, lack of material, unsatisfactory product, product rupture, etc., and select defective products (defective products can only be treated as waste, not in secondary use) to send qualified products to the next process.
Clean the edges of qualified products.
If the product needs to do the surface treatment, such as: surface injection, printing, engraving, etc., the product will be processed accordingly.
Carry out the last inspection of the product and select the defective products.