Essentials of liquid silicone mold heating design

Mold temperature control.

Liquid silicone injection molds undergo a curing reaction at a mold temperature of 120 to 150 ° C, and mold temperature control is critical:

The mold surface temperature needs to be stable:

If the surface temperature is too high, the product will be burnt, the parting line will crack, and the product will become brittle.

The surface temperature is too low, the rubber material cures slowly, and quality problems such as the product cannot be demolded;

The temperature of the mold needs to be heated evenly:

The mold is heated unevenly, and the temperature difference is large, which will make the rubber material flow instability, and it is prone to the phenomenon of stagnation and injection dissatisfaction;

Placement of heater:

A sufficient distance should be maintained between the heater and the parting line to prevent the template from warping and deforming, resulting in flash burrs on the finished product;

Comparison of mold temperature control heating methods:

Heating rod heating:

The heating rod uses a gun drill to punch holes. The gap between the heating rod and the hole will cause uneven heat transfer, the heating rod is easily damaged, and multiple groups of heating rods share a group of temperature sensing. The damage of the heating rod cannot be detected, and the mold temperature Uneven. Choose carefully

Heating plate heating:

A heating plate is designed at the bottom of the mold core, which is closely attached to the mold core. The heating plate design is independent of temperature and closed loop design to ensure that the temperature is controllable and the temperature of the heating plate is uniform. Recommended