"Liquid silicone" is a non-toxic, heat-resistant and highly resilient flexible thermosetting material. Commonly known as LSR (Liquid Silicone Rubber) in the industry.

The product shows good thermal stability, cold resistance, excellent electrical insulation properties, and does not produce toxic substances when burned.

LSR injection molding process:

LSR injection molding is divided into component A and component B. The mixer fully mixes component A and component B in a precise 1:1 ratio. Since some products are colored, the mixer is equipped with a color pump set and a color metering part. A+B components, additives, colors, etc. are fully mixed before entering the plasticizing system.

Key process requirements for LSR injection molding:

The rheological behavior of LSR is mainly characterized by low viscosity, rapid solidification, shear thinning and high thermal expansion coefficient. Therefore, it is necessary to control the process of its molding production process accordingly. Especially in the related aspects of feeding and injection molding.

Feeding - one-way pump system:

The synchronous single-phase pump with a check valve also needs to be equipped with a corresponding metering cylinder system to effectively control the accuracy of feeding.

Injection Molding - Mold Design:

Due to the high expansion coefficient of LSR, it will expand when heated and shrink slightly when cooled. Therefore, the parts cannot maintain precise side margins in the mold, so cold runner mold processing design should be used. To avoid turbulence and jetting, use small needle- or wing-shaped injection nozzles. Use T-shaped guide pins instead of cylindrical guide pins to increase positioning accuracy. Install insulation layer/board to facilitate demoulding of cured LSR.

Injection Molding - Injection Molded Parts:

Due to the low viscosity of LSR, material backflow and glue leakage must be considered during processing, so the sealing of the injection screw is very important. When the glue injection is completed, the nozzle will be closed immediately, and a needle valve nozzle must be used.

Market prospects of LSR injection molding technology:

"Injection molding technology of liquid silicone materials" is a new high-efficiency silicone rubber molding method developed in the late 1970s. After years of research and development, the market has increasingly adopted this technology to produce silicone rubber products, so it welcomes the Here comes a new era of high efficiency, high quality and low cost production in the silicone rubber processing industry.

Compared with the traditional hot vulcanization molding process, the use of this technology to produce rubber products has the advantages of saving time and energy, eliminating the need for post-processing, high product yield, and low overall cost (about 40% can be saved).