Patent EP-2305388-A1 (EP)
Inventor: BOCK MICHAEL
IPC: C11D17/00
Filed: 2009-10-01
Abstract: The device for coating cleaning agent-tablets, comprises a feed station for sequential feeding on a first conveyor device (2), which has gripping elements (3) for holding the tablet, a coating chamber (4) through which the tablets are guidable by the first conveyor device, a spraying device (5) or vortexing means within the coating chamber for providing a particle-air mixture, a second conveyor device having gripping elements for holding the tablet, and a delivery device that is arranged between the first and second conveyor device. The device for coating cleaning agent-tablets, comprises a feed station for sequential feeding on a first conveyor device (2), which has gripping elements (3) for holding the tablet, a coating chamber (4) through which the tablets are guidable by the first conveyor device, a spraying device (5) or vortexing means within the coating chamber for providing a particle-air mixture, a second conveyor device having gripping elements for holding the tablet, a delivery device that is arranged between the first and second conveyor device for delivering the tablet from the first gripping element of the first conveyor device to the second gripping element of the second conveyor device, a treatment chamber (9) through which the tablets are guidable by the second conveyor device, applicators arranged within the treatment chamber for applying energy to the surface of the tablet, a removal station for the removal of the treated tablet from the second conveyor device, a cooling station arranged between the treatment chamber and the removal station or below, above or behind the removing station. The particle consists of a material with which the tablet is coated. The tablet to be coated is connected with a first electric potential. The particle is provided by the electrode with the second electric potential. The first and second electric potential are different from one another. The electrode is integrated into the spraying device. The cooling station comprises an air-counterflow-cooling and the first and/or the second conveyor device comprises an endless conveying means. The gripping element comprises electrically conductive materials in order to connect the tablet to be coated with the first electric potential. The first gripping element is made of spring steel. The first or second gripping elements comprise clamps that have two legs that are malleable transverse to movement direction against elastic restoring forces. The legs comprise a first mounting end and a second gripping end and the clamps are connected near to the mounting end with the first and/or second conveying device. The gripping end comprises two contact ends, which pass transverse to movement direction of the first and/or second conveying device in order to contact the tablet from opposite sides. The applicator comprises nozzles for blowing super-heated water steam. The coating chamber comprises walls, whose interior surface is coated by polytetrafluoroethylene. The spraying device is formed for spraying a powdery material with a grain size of 1-1.000 mu m. The coating chamber comprises a suction device for the suction of a surplus of material, which is sprayed by the spraying device in the coating chamber. The suction device is in flow connection with a sedimentation chamber, which is connected with a conveyor device for conveying the coating material from the sedimentation chamber to the spraying device. Between the sedimentation chamber and the spraying device, a classification device for the deposition of particles that exceed the given grain size, and an optional grinding device for crushing particles deposited through the classification device and discharging of the crushed particles are arranged. The feeding station, the first conveyor device, the second conveyor device, the transferring device and/or the removing device comprise an arrangement for spreading the first and/or the second gripping element in order to detach and/or connect the tablet to be coated with the gripping element.