subject: Pelleting Machine And Method For Producing A Multilayer Pellet [print this page] Pelleting Machine and Method for Producing a Multilayer Pellet
The invention relates to a pelleting machine comprising a driveable die block provided with a defined number of dies distributed over the periphery thereof, bottom rams and top rams which are associated with the dies and rotate about a common rotational axis, synchronously with the die block, along a bottom ram guide and a top ram guide, at least one filler device for filling the dies with a material to be compressed, and a compression device for acting on the rams with a compression force. According to the steel belt, the filler device (18) comprises at least two independently chargeable filling chambers (24) which can be successively brought into a defined filling position. The invention also relates to a method for producing a multi-layer pellet by means of a rotary pelleting machine.
The flaker belt relates to a rotary pelleting machine and method for producing a multilayer tablet.
Pelleting machines are commonly known. A rotor of the rotary pelleting machine is set into rotation using a drive machine. The rotor includes dies arranged along a periphery which are associated with top plungers and bottom plungers. The dies are filled with a material to be pressed via at least one feed shoe and, depending on the angular position of the rotor, the bottom plungers and top plungers, which are guided via guide tracks, move axially with respect to the dies. The bottom and top plungers pass at least one pressing station, typically a pre-pressing station and a main pressing station.
Pelleting machines are known which can be used to produce so-called multilayer tablets, i.e., tablets containing several layers and/or inserts. Several feed devices and pressing stations are sequentially arranged along the periphery of the rotor. The rotor must therefore have a correspondingly large circumference which depends on the number of layers and/or inserts. Consequently, a rotary pelleting machine requires a large installation space.
According to another advantageous embodiment of the pelleting machine, the pressing device of the rotary pelleting machine includes a main pressure roller pair. The pressure rollers are preferably arranged so as to be adjustable in height with respect to the die block. The pressing force with respect to the filling height in the dies, which in turn depends on the number and the thickness of the individual layers or inserts, can then be set accurately. Preferably, the height of the pressure rollers is adjusted by using corresponding drives, in particular servo motors, pneumatic drives and the like.
