The problem with large-area components is often that they have too many frozen stresses after injection molding. This leads to component distortion and poor paint adhesion.

One way to counteract this is injection compression molding.

Here the injection mold is closed except for a defined gap and the injection of plastic begins. After an injection phase that depends on the respective component, the closing of the tool, the injection molding, started.

As a result, the plastic is distributed throughout the mold and an approximately equal internal mold pressure builds up over the entire component.

The overloading of areas close to the sprue and sink marks in the area far from the sprue due to a lack of holding pressure, which is common in injection molding, does not occur here.

Depending on the selected embossing movement, one also speaks of breath embossing or negative embossing.

The embossing movement is usually carried out by the clamping unit of the injection molding machine. For this it is necessary with an asymmetric gating that the machine has a

Plate parallelism control or additional compensation mechanisms are installed in the tool.

In the case of series tools, the tool should be sealed using an embossing frame or sealing frame.

Depending on the component geometry, this can also be equipped as an embossing strip or leader.

A design with a dipping edge is suitable for special processes such as the back-injection of textiles, leather and Alcantara.

A version with a dipping edge can also be used for pre-series tools. Another big advantage is that with injection compression molding applications, the necessary machine size can be significantly reduced because the internal mold pressures are lower.

In addition, material savings are possible due to thinner wall thicknesses.

At Summerer Technologies, we not only manufacture injection-compression molding tools for large glazing panes, but also for roof panels as antenna covers or front panels.

Injection compression molding is also used for headlight covers/diffusers, as soon as high precision and optical quality are required, which is necessary, for example, for the integration of lidar or radar sensors.

However, embossing is also used in our PUR coating tools or in classic ones Polycarbonate high gloss parts.

Techniques such as core embossing, wedge embossing, folding embossing or cascade embossing are also available as special applications. We are happy to determine the selection of the right technology together with our customer.

In addition, we are happy to support you with the selection and design of the planned injection molding machine with the necessary peripherals.

Injection compression can be combined with our processes:

  • Compression GatingFIM
  • foil back injection
  • IMD In Mold Decoration
  • Clean slider
  • direct gating