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7 aspects to pay attention to when designing LSR liquid silicone injection molds

The structure of thermoset liquid silicone rubber (LSR) injection molds is generally similar to that of molds used for thermoplastic compounds, but there are several significant differences. For example, LSR compounds generally have a low viscosity and therefore very short filling times, even at very low injection pressures. To avoid air trapping, it is essential to have a good air venting device in the mold. In addition, LSR compounds do not shrink as much as thermoplastic compounds in the mold; they tend to expand when hot and shrink slightly when cold. As a result, the product does not always remain on the convex side of the mold as expected but is retained in the cavity with a larger surface area.

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Zetarmold

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โˆ™ 2022-09-16 03:26:47
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Shrinkage

Although LSR do not shrink in the mold, they often shrink 2.5% to 3% after demolding and cooling. The exact amount of shrinkage depends to some extent on the formulation of that compound.

However, from a mold perspective, shrinkage can be influenced by several factors, including the temperature of the mold, the temperature of the compound when it is demolded, as well as the pressure in the mold cavity, and the subsequent compression of the compound.

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