What are the different processing methods for silicone rubber?
2024-01-22 13:19:27
Silicone molding (moulding) is a manufacturing technique used to transform silicone rubber to create a final product with specific characteristics: shape, hardness or elasticity, color, degree of transparency, tear strength, etc.Silicone rubber can be processed using various methods to create a wide range of products. The choice of processing method depends on the specific characteristics desired for the final product, including compression, injection and extrusion. The choice depends on the size and complexity of the component, required volumes, and budget available for tooling. The most widely used processes are: Injection molding Injection molding involves injecting molten silicone rubber into a closed mold cavity under high pressure. This method is suitable for producing intricate and complex parts with high precision. Injection molding offers economical advantages including a short molding cycle, lower per unit cost, high dimensional tolerances in absence of flash and little scrap or waste. It is commonly used in the production of consumer goods, medical devices, and electronic components. Compression Molding In compression molding, silicone rubber is placed in a mold cavity, and then the mold is closed. Heat and pressure are applied to cure the material and form the final product. This method is often used for producing gaskets, seals, and various components. Silicone Extrusion Silicone rubber can be extruded into continuous profiles, such as tubes, cords, various types of sealsand gaskets. This process involves forcing the rubber compound through a shaped die to create the desired cross-sectional shape. Silicone extrusions typically show a huge improvement over other materials – they last longer, come in a multitude of colours, and stand up to a wider variety of environmental conditions. Extrusion products mainly applicated in Medical equipment, electronic accessories, etc. Transfer Molding Transfer molding combines elements of compression molding and injection molding. A measured amount of silicone rubber is placed into a chamber (pot), and a plunger forces the material into a heated mold cavity. This method is suitable for producing parts with intricate details and is often used in the electronics industry. Overmolding Overmolding involves combining silicone rubber with other materials, such as plastics or metals, to create a composite product. This process is often used to add a layer of silicone for enhanced grip, durability, or other properties. Calendering Calendering is a process where silicone rubber is continuously compressed and smoothened by being passed between sets of heated rollers. These hard steel roller sets, referred to as calenders, apply pressure to produce silicone sheets of consistent thickness and desired surface finishes, ranging from shiny or matte to smooth or textured. This method is commonly used for producing silicone rubber sheets used in various applications. These processing methods provide flexibility in manufacturing silicone rubber products, allowing for a diverse range of applications across industries. The choice of method depends on factors such as the complexity of the product, desired properties, and production volume.
