The principle and application of tablet press

The principle and application of tablet press

A machine in which a granule or powder material is placed in a die hole and pressed into a tablet by a punch is called a tablet press.

The earliest tablet press consisted of a pair of dies, which were pressed up and down to press the granular material into a sheet. This machine was called a single punching machine and later developed into an electric basket press. The working principle of the two tablet presses is still a one-way tableting based on manual stamping, that is, the undershoot is fixed when the tablet is pressed, and only the upper punching motion is pressurized. In this manner of tableting, the density of the inside of the tablet is not uniform due to the inconsistent force on the upper and lower sides, and problems such as splitting are likely to occur.

In response to this shortcoming of the unidirectional tablet press, a rotary multi-punch two-way tablet press was born. The tablet press is pressed up and down uniformly and uniformly, so that the air in the drug particles has a sufficient time to escape the die hole, thereby improving the uniformity of the density of the tablet and reducing the phenomenon of cracking. In addition, the rotary tablet press has the advantages of low machine vibration, low noise, low energy consumption, high efficiency and accurate tablet weight.

The rotary tablet press is a machine in which a plurality of pairs of dies uniformly distributed on the turntable are moved in a circular motion by a certain trajectory, and the granular material is pressed into a tablet by a pressure roller. The tablet press with the linear speed of the turret rotating with the turntable is ≥60m/min. It is called high-speed rotary tablet press. This high-speed rotary tablet press has a forced feeding mechanism. The machine is controlled by PLC and has automatic pressure adjustment and control. The weight of the film, the elimination of the waste film, the printing data, the display of the malfunction and other functions, in addition to the control of the difference in the weight of the film within a certain range, the quality problems such as missing corners, loose pieces can be automatically identified and can be eliminated.

The sheet shape pressed by the tablet press is mostly flat and round, and later developed into a shallow arc shape and a deep arc shape on the upper and lower sides, which is required for coating. With the development of profiled tablet presses, tablets such as oval, triangular, oblong, square, diamond, and circular are produced. In addition, with the continuous development of the preparation, due to the requirements of the compound preparation and the time release preparation, a special tablet such as a double layer, a three layer, and a core is prepared, which is required to be completed on a special tablet press.

With the development of market demand, the scope of application of tablet presses is becoming wider and wider, and it is no longer limited to suppressing Chinese and Western medicine tablets. It can also widely suppress health foods, veterinary tablets, chemical tablets: such as mothballs. Health balls, washing blocks, Smurf blocks, fine art cakes, pesticide tablets, etc., food tablets: chicken fine blocks, slate root blocks, Shenqu tea blocks, compressed biscuits, etc.