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Several molding types commonly used in the production process of silica gel products
Jun 10, 2018

1. extrusion molding process: as we like toothpaste, the extrusion and the cross section shape of the product, has the certain length, in under the action of force and temperature, the nose out products have vulcanization molding. The product that this craft forms is bar form product commonly, product section can all sorts of. For example, rectangular strips, circular silicon tubes and so on.

2. Glue dropping process: the silica gel material is liquid, the raw material is installed in the needle tube, and the raw material is dropped onto the mold by pneumatic and manual operation, which is heated and vulcanized. This craft belongs to handcraft change craft, need artificial place is much. So it's not very productive. It has a feature that allows a product to be dripped in multiple colors as required. So this kind of craft is to make handicraft more. For example, polychrome silicone bracelet, various color patterns of silicone mobile phone cover.

3. Solid thermocompression molding process: this process USES the temperature and pressure of the oil press to vulcanize the product with the help of the mould. This kind of technology is relatively low cost, high yield and common application. It is used in monochrome silicone products. It can also be applied to double-color products with double hardness or multi-color products with multi-hardness, but the structure of the products is not flexible and limited. It can also be applied to plastic bags and metal bags, which are also not flexible in structure, and there is a temperature requirement for the package, which generally requires the package to withstand 180 degrees centigrade deformation.

4. Liquid injection molding process: the equipment required by this process includes silicon injection machine and material pressing machine. Its raw materials are water thick, divided into A, B components. Its principle is: the raw materials of A and B components are mixed by the press into the material cylinder of the injection machine according to 1:1, which is then pressed into the hot mould cavity through the nozzle. The molding temperature of this kind of craft is relatively low, 130 degrees is ok. It can be used in less resistant to high temperature plastic wrap molding, which has advantages over solid hot forming. It is highly productive and easy to automate. But the cost of raw materials is several times higher than that of solid silicone materials.