(1) Adequate mixing of liquid silica gel
Precise mixing ratio: LSR is a two-component raw material of A and B. Before injection molding, it must be fully mixed according to an accurate 1:1. If it is a colored liquid silicone product, the color paste ratio must also be precisely controlled.
Mixer: The static mixer is a key component in injection molding. Only after the static mixer is fully and uniformly mixed, the liquid silicone rubber injected into the mold can be fully vulcanized.

(2) Sealing and temperature control of injection molding machine parts
Due to the low viscosity of LSR, the screw must be sealed to consider the backflow and leakage of the material;
Since the mold is heated during the LSR molding process, in order to prevent the LSR from solidifying, a water-cooled nozzle can be used to ensure that the temperature is sufficiently low.

(3) Finished product control during injection molding
Parting line: The position and accuracy of the parting line are considered in advance, which helps to avoid air entrainment and welding, and avoid burrs;
Shrinkage: Although LSR does not shrink during injection molding, due to its extremely high thermal expansion coefficient, it usually shrinks by 2% to 3% after demolding and cooling;
The location of the injection port: the actual product shrinkage rate needs to be considered;
Vacuuming: When designing the parting line, ensure that the mold is sealed, and the vacuum pump will vacuum all the cavities through the fixture under the mold switch;
Demoulding: Generally, demoulding techniques of fractionating column tray, ejector pin and air ejector are used, or manual demoulding.
Mold temperature: LSR is vulcanized during heating, and the temperature in the mold must be controlled to distribute evenly. The temperature difference is controlled at +/-10°C.