What are the types of molding processes for foam sealing strip products?
Dec 10,2024
1. Extrusion Molding Process
Just like squeezing toothpaste, the extruder head also has a certain length and cross-sectional shape of the product. Under the effects of force and temperature, the product that comes out of the head has already been vulcanized and formed. Products formed by this process are generally strip-shaped, and the cross-section can vary widely. For example, rectangular strips, ring-shaped silicone tubes, etc.
2. Dripping Glue Process
Silicone material is in a liquid state, placed in a syringe, and dripped onto the mold using pneumatic and manual operations, then heated and vulcanized to form. This process is manual and requires a lot of human involvement, so the production capacity is not high. It has a characteristic where a product can be dripped in multiple colors as required. Therefore, this process is often used for making crafts, such as multi-colored silicone wristbands, silicone phone cases with various colored patterns, etc.
3. Solid Hot Press Molding Process
This process uses the temperature and pressure of an oil press machine, relying on molds to vulcanize and form the product. This process has relatively low costs, high output, and is widely used. It is mostly used for single-color silicone products. It can also be used for dual-color, dual-hardness products or multi-color, multi-hardness products, but the structure of the products is not flexible and is limited. It can also be used for plastic and metal encapsulation, which is similarly not flexible in structure and has temperature requirements for the encapsulated items, generally requiring that the encapsulated items can withstand 180 degrees Celsius without deformation.
4. Liquid Injection Molding Process
This process requires equipment such as a silicone injection machine and a material press. Its material is in a viscous state, divided into two components A and B. The principle is to use the material press to mix components A and B in a 1:1 ratio into the injection machine's barrel, and then inject it into the hot mold cavity through the nozzle. The molding temperature for this process is relatively low, at 130 degrees it can work. It can be used for plastic encapsulation that is not very heat-resistant, which is an advantage over solid hot press molding. It has high output and is easy to automate production. However, the cost of the material is several times higher than that of solid silicone materials.
The company specializes in producing EPDM rubber sealing strips, EPDM sponge foam rubber strips, rubber and plastic sealing strips, PVC sealing strips, high temperature resistant silica gel strips, flame retardant sealing strips, dense-sponge-steel core three-composite, four-composite sealing strips, soft plastic-hard plastic composite strips, PVC/CPVC/ABS/TPE material extrusion composite strips and other products.
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