Differences in moldability comparing Injection Compression Molding and Injection Molding

Injection Compression/Press Molding Analysis has been added as an optional feature in PlanetsX 1.2. In the primary stage of Injection Compression Molding, a predetermined amount of resin is injected into a mold which is in an open state. At this point the mold is not filled completely. The molding process is completed by closing the mold to a predetermined position. This method allows the use of much lower injection pressure and pressure on the molded product when compared to Injection Molding. As a result, this method is used to prevent mold defects due to pressure.

In this analysis, consider the differences in Injection Molding and Injection Compression Molding with regard to injection pressure and pressure on the molded product.

Injection compression molding

Analysis model and mesh model


Fig. 1: Mesh created from the mold
in open state in the primary stage
Injection Compression/Press Molding Analysis provides the choice of two types of mesh models; from the mold in the open state in the primary stage or from the mold in the closed state in the final stage. In the closed state model, initial amount of open state is required to be input on the graphic user interface.
In this analysis, mesh created from the mold in the open state in the primary stage is used.

Visualization of the filling process of Injection compression molding

The following figure shows the filling process of Injection Compression Molding. The primary phase appears to be a short shot because the mold at this point is in an open position. The filling process is completed by closing the mold.


Fig. 2: Visualization filling process of Injection Compression Molding

Injection Molding

Analysis model and mesh model


Fig. 3: Mesh model for Injection Molding
In Injection Molding, a mesh model is created with the shape of the final product.

Visualization filling process of Injection Molding


Fig. 4: Visualization of the filling process of Injection Molding

Comparison of pressures using Injection Molding and Injection Compression Molding

Analysis showing pressure on the molded product is lower in Injection Compression Molding than Injection Molding.


Fig. 5: Pressure on the product using
Injection Compression Molding

Fig. 6: Pressure on the product using
Injection Molding

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