Pellet Press PP 40
Solid, high-quality pellets are an important precondition for reliable and meaningful XRF analysis. With the PP 40, RETSCH offers a pellet press which presses a wide range of materials such as slag, ores, minerals and cement to strong pellets with a smooth surface.
The PP 40 features an individual pressure force regulation in the range of 50 to 400 kN. Besides controlling the pressure force, it also determines build-up, maintenance and release of force during pressing. This reduces the inner tensions of the sample and ensures that even difficult materials are pressed perfectly.
Product Advantages
- individual pressure force regulation 50 – 400 kN
- 1-button operation with graphic display
- 32 parameter combinations can be stored
- pressing tools for various diameters and aluminium cups
- suitable for very hard materials
- pressure plate made from tungsten carbide
- easy and safe operation
- maintenance-free, CE-conforming design
- 2 year warranty
Features
| Applications | preparation of pellets for spectral analyses |
| Field of application | chemistry / plastics, construction materials, environment, glass / ceramics, mineralogy / metallurgy |
| Max. pressure | 40 t, automatic press |
| Pressure force | 5 - 40 t (50 - 400 kN) |
| Pressure force increase / holding / decrease time | respectively 5 - 600 s |
| Parameter combinations | 32 |
| Steel rings (external Ø / internal Ø) | 51.5 mm / 35 mm 40 mm / 35 mm (max. pressure force 20 t) 40 mm / 32 mm |
| Aluminium cup (external Ø) | 40 mm |
| W x H x D | 836 x 1220 x 780 mm |
| Net weight | 345 kg |
| *depending on feed material and instrument configuration/settings |
Function Principle
The steel ring or aluminium cup is inserted in the pressing tool of the PP 40 and filled with the sample material via a hopper. The steel ring is then pushed beneath the pressure plate and the pressing is started. During pressure build-up the density of the powder increases. The pressure build-up in the PP 40 can be adjusted in such a way that the air inside the hollows of the original powder is pressed out which increases the stability of the pellet. The maximum pressure force must be held over a certain period of time to allow full development of the interparticulate adhesive forces thus guaranteeing maximum stability.
The PP 40 provides pre-selection of the pressure holding time over a period of 600 seconds. During the pressing process the axial movement of the particles at the steel ring produces friction which in turn leads to the formation of a multi-axial stress condition. Therefore, it is important to decrease the pressure evenly and steadily as an abrupt release could lead to the destruction of the pellet. The pressure decrease time of the PP 40 can be set in such a way that a uniform release of tension is ensured.
The steel ring or aluminium cup is inserted in the pressing tool of the PP 40 and filled with the sample material via a hopper. The steel ring is then pushed beneath the pressure plate and the pressing is started. During pressure build-up the density of the powder increases. The pressure build-up in the PP 40 can be adjusted in such a way that the air inside the hollows of the original powder is pressed out which increases the stability of the pellet. The maximum pressure force must be held over a certain period of time to allow full development of the interparticulate adhesive forces thus guaranteeing maximum stability. The PP 40 provides pre-selection of the pressure holding time over a period of 600 seconds. During the pressing process the axial movement of the particles at the steel ring produces friction which in turn leads to the formation of a multi-axial stress condition. Therefore, it is important to decrease the pressure evenly and steadily as an abrupt release could lead to the destruction of the pellet. The pressure decrease time of the PP 40 can be set in such a way that a uniform release of tension is ensured.
