What is liquid silicone rubber injection molding process?

Generally speaking, rubber molding requires 5-6 operating steps: rolling, calendering or extrusion, pressing, conveying, injection molding and trimming of the final product, while liquid silicone rubber molding requires only one step: injection molding. This processing method has simple equipment, and the equipment with high energy consumption commonly used in rubber processing, such as rolling mills, extruders, and heavy compression molding press, can be replaced by fixed mixers and light injection molding machines, with short processing cycles and small parts. It only takes 10 seconds, no mixing and preforming are required, and the precise metering and delivery are controlled by a general system, which can realize automatic operation. In addition, due to the low injection pressure and rapid vulcanization, the product has no flash.

Silicone products can be divided into three categories according to different molding processes.

Molded Silicone Products

Molded silicone products are usually formed by putting the solid silicone raw material with a vulcanizing agent into the high-temperature mold and then applying pressure through the silicone molding machine. The raw materials are combined with the color paste to adjust the color according to the Pantone color card number. The shape of the mold determines the shape of the molded silicone product. The molded silicone product is currently the most widely used in the silicone industry. Mainly used to make silicone industrial accessories, buttons, silicone gifts, silicone bracelets, silicone watches, key cases, mobile phone cases, silicone kitchen utensils, silicone mats, ice trays, cake molds, etc.

extruded silicone products

Extruded silicone products are usually formed by extruding silicone through an extrusion machine. Generally, the shape of extruded silicone is long, and the tubular shape can be cut at will. However, the shape of extruded silicone has limitations. It is widely used in medical equipment and food machinery. use.

Liquid silicone products

Liquid silicone products are molded by silicone injection molding. The product is soft and its hardness can reach 10°C-40°C. Because of its softness, it is widely used in simulating human organs, medical silicone chest pads, etc.

Special Silicone Products

Special silicone products are based on the chemical properties of silica gel or the addition of some auxiliary raw materials. Special silicone products can also have high temperature resistance (up to 330 degrees), food grade (full compliance with US FDA, LFGB standards), medical grade, flame retardant grade , by adding auxiliary raw materials, it can also have the characteristics of luminous, negative ions, discoloration, etc.

It is widely used in the field of liquid silicone products such as medicine, food, infant products, diving supplies, electrical insulation accessories and cable accessories. In addition, with strong technical strength, Our Machinery can design the required liquid silicone injection machine according to customer requirements. Molding equipment, and provide a full set of solutions for liquid silicone machines: feeders, molding machines, mixing systems, colorant pumps, silicone molds, etc.