The raw material is transported either into the compression-loading reservoir or directly into the pressure fill machine depending on the silo's filling type. During the compression-loading the material is mounted under pressure in this compression-loading reservoir and only after the tuned loading-pressure is achieved is it transported into the pressure fill machine in retention of the pressure. A pressure sluice is only essential for continuous compression-loading.
In the pressure-charger the material is compressed pneumatically in both filling types. Just the material of the crack-filling is passed uncompressed. In the next step the tool is closed. This is initially done electrically. Not until only a few centimeters before the zero point do hydraulic swarf-forceps seize and provide the necessary locking pressure. At the crack-filling the clamping force of the swarf-forceps and the short hydraulic closing stroke are used for the compression of the material.
2. Flling under pressure
At the pressure-filling (loaded/unloaded) a dynamic pressure in the closed tool must firstly be set up. After that the material of the pressure fill machines is injected into the tool by filling injectors. The crack-filling is worked without dynamic pressure. The tool of the pressure-filling is vented by the effluent valves. The particles expand.
At the crack-filling the tool is now closed completely. At the beginning of the sputtering the steam and effluent valves are opened shortly. Thus, the steam chambers are rinsed with steam. So, the air is eliminated in the steam chambers.
Firstly the steam valve on the one side and the effluent valve on the other side are opened. Afterwards the same procedure is repeated the opposite way around. The steam flows from one of the steam chambers via the steam duct in the tool through the shaped part into the other steam chamber. Steam pressure and sputtering length define the welding of the shaped part.
Then the autoclave is steamed. In doing so, both steam valves are opened when the effluent valves stay closed. Here, steam pressure and sputtering length regulate the surface of the shaped form (skinning). The sequencing water cooling results from spraying ducts behind the tool. Before the demolding the shaped part still needs stabilization time so that the foam pressure falls to an admissible extent.
When opening the form,the shaped part is pushed out of the hood with pneumatically steered ejections . Additionally the demolding can be supported by an air blast of the steam valves.