How To Choose The Right Process Of Silicone Molding?

Silicone processing methods encompass a range of widely employed manufacturing techniques that effectively transform silicone rubbers into final products with distinct characteristics. These methods play a crucial role in shaping silicone-based items, determining factors such as form, hardness, elasticity, color, transparency, tear strength, and resistance to environmental or mechanical stress. Silicone rubber molds are widly used in architectural restoration, candlemaking, concrete casting, lifecasting,sculpture & art casting and special effects etc. The molding method is used in different industries, mainly including compression molding, transfer molding and injection molding.

The most widely used processes are:

  • Injection Molding
  • Compression Molding
  • Transfer Molding
  • Silicone Extrusion
  • Calendering

Injection Molding

Injection molding is a manufacturing process that entails injecting molten silicone rubber into a closed mold cavity under elevated pressure. This technique is well-suited for the production of intricate and complex parts with exceptional precision. It is widely applied in various industries, injection molding is a common method for manufacturing consumer goods, medical devices, and electronic components. While silicone molding may not be the best choice for very large or thick objects, it is highly suitable for smaller parts that require flexibility and resistance to the elements.

Compression Molding

Compression molding is an advanced manufacturing method which is well suited for mass production of rubber parts and products. This process uses heat and pressure to bond rubber compounds and create a precise shape and size. The manufacturing process is relatively simple and involves a steel mold that is closed and heated, resulting in the melting of the rubber compound as it is forced into the mold cavities to form the desired shape. Once the mold is removed, any excess material is trimmed away and the result is a precise component with little seam. It is oftern used for producing gaskets, seals, and various components.

Transfer Molding

Transfer molding is similar to compression molding in several ways. In this process, HCR is pressed from an auxiliary chamber, commonly referred to as a transfer pot, into a closed pressurized mold system. This system incorporates a heated container above the mold where silicone rubber is charged using a piston-powered gate and runner system, facilitating the movement of relatively hard materials into the mold before the heating process.

The silicone rubber transfer molding process is well-suited for producing high-precision silicone molded parts and allows for overmolding with other materials. This capability enables the molding of intricate geometries, making it an ideal method for manufacturing complex components.

Silicone rubber extrusion

Silicone rubber extrusion involves forcing the rubber compound through a shaped die to create the desired cross-sectional shape. It is commonly employed for crafting a variety of components, including hoses, cords, complex profiles, and multi-layered parts. This versatile process is ideal for producing lengthy items such as rods, oven seals, electrical cables, wire insulation, gaskets, and seals. Its adaptability makes it well-suited for the creation of diverse silicone rubber products.

Calendering

Calendering is a manufacturing process which the silicone rubber is continuously compressed and smoothened by being passed between sets of heated rollers. This technique is widely applied in the production of silicone rubber sheets, serving diverse applications across various industries.

The various silicone rubber molding techniques, ranging from LSR injection molding to compression and transfer molding, provide manufacturers with a myriad of options to produce intricate and high-quality components. YJC polymer company offer diverse manufacturing technology including mold design and manufacturing, silicone and plastic injection molding, liquid silicone two-color molding, compression molding and extrusion molding. We will provide customers first-class customized one-stop solutions.

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