What are the characteristics of liquid silicone molds?

Compared to solid low-temperature vulcanized silicone rubber, liquid silicone is a liquid rubber with good mobility, fast vulcanization, more safety and environmental protection, and can meet food grade requirements. The production of liquid silicone rubber cannot be separated from the help of liquid silicone rubber molds. So, what are the characteristics of liquid silicone rubber molds reflected in?

1. Shrinkage rate

Liquid silicone molds that sell well in the industry do not shrink in the mold when used, but they shrink to a certain extent after demolding and cooling. As for the degree of shrinkage, it depends on the quality of the mold and the formula of the rubber. However, from a mold perspective, the shrinkage rate may be affected by mold temperature, material, and the pressure in the mold cavity, as well as the subsequent compression of the rubber. Liquid silicone molds can effectively improve this situation.

2. Parting line

Determining the position of the parting line is one of the first steps in designing a silicone rubber injection mold. The exhaust gas is mainly achieved through grooves located on the parting line, which must pass through the area that is reached after the injection of rubber. This design of the liquid silicone mold helps to avoid internal bubbles and reduce the strength loss at the adhesive joint.

3. Exhaust

With the injection of liquid silicone rubber, the air trapped in the cavity of the liquid silicone rubber mold is compressed when the mold is closed, and then discharged through the vent groove during the mold filling process. If the air cannot be completely discharged, it will stay in the rubber material, which often causes the white edge of the product to be exposed.

The above is the embodiment of the characteristics of liquid silicone rubber molds, mainly due to the perfect treatment of the molds, which can affect the shrinkage, parting type, and exhaust gas of liquid silicone rubber. Therefore, when producing liquid silicone rubber, it is necessary to select a suitable liquid silicone rubber mold to ensure product quality.