The Low Pressure Moulding technology is generally based on simple principles. It is made successful by the combination of special properties of the moulding materials in processing and effectiveness, technological processing options taken from the application and injection molding technologies as well as adapted tool technology and system control.

Materials

Amorphous polyamides are used, which, in contrast to crystalline polyamides, on the one hand have excellent adhesive properties (adhesion) and on the other hand are very suitable as a housing replacement due to their significantly higher mechanical strength compared to other hotmelts (cohesion).

The amorphous structure also results in a relatively low processing viscosity, which allows these materials to be processed in a moderate processing temperature range (190 ° C - 250 ° C) at comparatively very low pressures (5 - 60 bar - in individual cases up to 100 bar).

In addition, specially structured polyolefins are occasionally used. Wherever the adhesion of the polyamides reaches its limits, they offer good properties both with the amorphous polyamides and with a large number of crystalline and strongly cross-linked materials.

The properties of the materials can be varied in a targeted manner through various combinations of raw materials and special requirements, such as UV resistance, hydrolysis resistance and increased thermal conductivity, can be implemented with the appropriate additives.

Machine system and toolings

Due to the intersection of material- and adhesive-typical properties, the processing equipment used can rely on adhesive application technology and the classic injection molding process 

and these can be combined and modified in such a way that a specific machine technology is created. 
The corresponding extensive knowledge about the possibilities and requirements of the Low Pressure Moulding process enables to create an effective, clean and cost-effective production platform for the process and the system control.

The structure of the materials enables the use of modified tank devices in combination with piston or gear pumps as well as hotmelt extruders with special dosing systems to avoid pressure peaks.

In tool technology, mainly aluminum is used in order to take into account the adhesive properties of the materials and to ensure demouldability, in combination with steel inserts to increase the stability where abrasion occurs in the process, e.g. through insert parts. The entire structure of the moulding tools in Low Pressure Moulding also takes into account the specific process-optimised number and arrangement of moulding cavities and the injection direction.

Project specific solutions

The entire technology offers many options for adaptation. Due to the systematic modular design and a large number of possible variations of the individual components, the processing systems can be adapted to almost all project and production-related requirements. This means, on the one hand, individual workstations can be largely individually designed, and on the other, more complex moulding stations can also be integrated as modules into overall production processes, as required. In almost all cases this leads to a simple and clean process and to significant cost advantages.