Device for monitoring the production of tablets in a rotary press, with die bores in a circular die plate for the accommodation of a powder to be pressed, upper- and lower stamps, a pressing station for pressing the powder in the die bores by means of the upper and lower stamps, a tablet stripper for stripping off the tablets ejected by the lower stamps from the upper side of the circular die plate and a machine computer, wherein a contactless working temperature measurement device, being in communication with the machine computer, with a measurement plane between the pressing station and the tablet stripper, is arranged in the press room of the rotary press, and the measurement time of the temperature measurement device is such that at least some of the tablets per rotation of the circular die plate can be established in their temperature.
Description
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
FIG. 1 shows a part of a rotary tablet press with a temperature sensor.
FIG. 2 shows a part of the device according to FIG. 1 in an enlarged view, with an additional block diagram.
Claims
1. Device for monitoring the production of tablets in a rotary press, with die bores in a circular die plate for the accommodation of a powder to be pressed, upper- and lower stamps, a pressing station for pressing the powder in the die bores by means of the upper and lower stamps, a tablet stripper for stripping off the tablets ejected by the lower stamps from the upper side of the circular die plate and a machine computer, characterised in that a contactless working temperature measurement device, being in communication with the machine computer (44), with a measurement plane between the pressing station (24, 26) and the tablet stripper (38), is arranged in the press room of the rotary press, and the measurement time of the temperature measurement device is such that at least some of the tablets per rotation of the circular die plate can be established in their temperature.
2. Device according to claim 1, characterised in that a contactless temperature measurement device is provided, an infrared measurement device for instance.
3. Device according to claim 1, characterised in that the temperature measurement device is in communication with the machine computer (44) via a line or in a wireless manner for the purpose of logging, monitoring, sorting and so forth.
4. Device according to claim 1, characterised in that a position transmitter (48), being in communication with the machine computer (44), is assigned to the machine computer (44), which triggers via the machine computer (44) either a measurement procedure, depending on a temperature measurement position of the dies (16) with respect to the measurement plane, detected by the position transmitter (48), or an evaluation of a measurement signal in the machine computer (44).
5. Method for monitoring the production of tablets in a rotary press, which has a rotor with upper and lower stamps, circular die plate, cam system for the stamps, at least one pressing station and a filling system for the powder-shaped pressing material in a press room, characterised in that with the aid of a contactless working temperature sensor having a short temperature acquirement time, the temperature of the tablets is measured in the press room, after the upper stamps have left the die, wherein the temperature is measured for at least some of the tablets per rotation of the rotor, position signals for the die are created with the aid of a position transmitter for determining a temperature measurement position, the temperature data are set into a relation to the temperature measurement position, and the maximum temperature of the tablets is established by means of a cooling characteristics of the tablets, the point in time of temperature measurement and the point in time of the pressing.
6. Method according to claim 5, characterised in that at least two temperature measurements per tablet are carried out.
7. Method according to claim 5, characterised in that the energy quantity taken up by the tablets is established with the aid of the mass of the pressed articles and a time-temperature diagram for the material of the tablets.
Patent Application
20070164480
