Systems for Automatic Pressure Gelation (APG)

The APG-process by HÜBERS permits short cycle times thanks to rapid gelation and demoulding with automatic opening and closing of the mould. During the gelling process, fresh material is supplied continuously to the mould under pressure in order to prevent cracks and voids and to compensate for the shrinkage of the material. The mould is held together by the clamping machine. The degassed material is injected into the APG mould directly from the static mixer. Shrinkage compensation is carried out by the HÜBERS metering pumps. One central mixing and metering system can serve several clamping machines. In this case each clamping machine has its own static mixer positioned directly in front of the mould and also has its own shrinkage compensation unit to maintain the pressure. The system is supplied via a ring line which requires no maintenance and is free of sedimentation. In principle the length of this line is insignificant.