Definition

Injection-compression molding (ICM) in a stack mold is an absolute novelty in the industrial production of packaging.

The injection-compression process is different from conventional injection molding due to the method of the resulting material shrinkage in the cavity ("shrinking effect") being compensated during the cooling of the melt. In conventional injection molding, this is carried out during the hold pressure phase via a "pressing" of additional material. Conversely, during the ICM procedure, the "shrinking effect" is compensated for by an actual compression process. As a result, material savings of up to 25% can be achieved.

Due to the incredibly fast injection times, the filling of the cavities is lightning quick, yet extremely even. Due to the reduced pressure, stresses in the product are avoided.

In summary, the ICM procedure provides unbeatable savings in cycle times as well as material and energy consumption, and increases the quality of produced packaging at the same time. Using a stack mold significantly increases the level of productivity.