The general width on the vent groove is lmm-3mm along with the depth is 0. However, the parting lines can frequently be seen on shaped solutions.Although LSR won't shrink in the mold, these people often shrink by 2. If the air cannot be completely discharged, it will relax in the rubber (this will often cause the item part of the exposed white wine edge). 5%-3% right after demoulding and cooling.

The external dimensions of the product also have an effect on its shrinkage, and the shrinkage of thicker products is mostly smaller. As to simply how much it shrinks, it depends for some extent on the formula with the compound. With the injection of your LSR, the air trapped from the mold cavity is compressed when the mold is closed and then discharged from the vent groove as the mold filling process progresses. Due to the low viscosity in the LSR, the parting line need to be precise to avoid spillage.

Designing the article to be slightly chamfered helps so the article has a consistent affinity for the other cavity half that is household mould required. 004mm-0. 7%. 5%-0.

However, from the mold perspective, shrinkage may be affected by simply several factors, including the temperature on the mold, the temperature of the particular mold during mold release, as well as the pressure within the mold cavity as well as subsequent compression of the composite. 

Exhaust is principally achieved through grooves on the actual parting line, and this groove have to be in the area where this injection molding compound finally gets there.