1, extrusion molding process
Extrusion molding is like the extrusion of toothpaste. The extrusion head is also the cross-sectional shape of the product. It has a certain length. Under the effect of force and temperature, the head comes out of the product and has been vulcanized. The product formed by this process is generally a bar-shaped product, and the product section can be various. For example, rectangular strip l, annular silicon tube, etc.
2, Epoxy process
Silicone raw material is in liquid state, and the raw material is contained in the syringe barrel. The material is dripped onto the mold by pneumatic and manual operation and heated and vulcanized to form. This process is a manual process that requires more manual labor. So the capacity is not high. It has a feature that a product can be dropped in multiple colors as required. So this craft is mostly crafted. For example, multicolor silicone wristbands, silicone phone cases with various color patterns, etc.
3, solid state hot pressing molding process
Using the temperature and pressure of the hydraulic press, the product is vulcanized with a mold. This process is relatively low cost, high yield, application is more common. It is mostly used for monochrome silicone products. Can also be applied to two-color double-hardness products or multi-color multi-hardness, but the product's structure is inflexible and limited. It can also be applied to package plastics and cladding metals. It is also structurally inflexible and has temperature requirements for the packaged items. Generally, the packaged items are required to withstand 180 degrees Celsius without deformation, such as silicone opener.
4, liquid injection molding process
The equipment required for this process includes silicone injection machines and press feeders. Its raw material is water-thick, divided into A, B two components. Its principle is: the use of press machine to A, B components of raw materials in accordance with 1:1 pressure injection into the barrel of the injection machine, through the nozzle and then press it into the hot mold cavity molding. This process is relatively low temperature molding, 130 degrees can be. It can be used for plastic encapsulation molding that is not very resistant to high temperatures, which is an advantage over solid-state thermoforming. It has a high output and it is also easy to automate production. However, the cost of raw materials is several times higher than that of solid silicone raw materials. Therefore, this method is generally used by few manufacturers.