About pressing of tablets

Eccentric tablet machine type

Eccentric machine type is single-machine, in the exercise of its basic operations treated objects (tablets) not commit traffic. During the process cycle each operation is performed separate actuator: loading mechanism (dosing), pressing mechanism and a mechanism pushing the final tablet. Such machines are characterized the fact that the production of tablets is carried out using a single set of molds.
Consider working phases press eccentric type:
First phase: both punch (lower, upper) and hopper (dispenser) are on the launch pad. A dispenser fills the matrix of the tablet weight. Movement of the lower punch down-regulated and its final position causes dose tablet weights.
The second phase, the upper punch press descends and enters the die opening, with a sealing force to the mass to be tablet achieving satisfactory strength of the tablets.
Third phase: the upper punch press rises and takes the starting position, the lower press also rises and pushes up the resulting tablet.
The fourth phase dispenser refills matrix tablet weight; during pressing filled matrix shifts.
An eccentric type tablet machine separated by a sled, and intermediate, the so-called shoe.
Sled type of machine is characterized in that the hopper during operation moves with special sled. Tablet mass enters the channel matrix through the hopper. Matrix is ​​fixed to the matrix table and limited below the lower punch. Load the hopper back to the initial position, and the upper punch, falling down, press a tablet weight, and then returns to its original position. Simultaneously, the lower punch rises and pushes out the finished tablet, which is discharged into the receiver tablet push the lower base of the funnel.
Eccentric sled machines are not without drawbacks, chief among which is the only tablet pressing upper punch with one hand on the type of impact - top and short. At the same compaction pressure is distributed unevenly in the tablet and the upper half is more compacted, and certain powders because of the short cycle compression bad press. Furthermore, these machines are inefficient: 30-50 tablets / min.
Intermediate tableting machine (shoe) close to the sled in its design, and also have the same operation principle. Their difference lies in the stillness of the matrix and the hopper. Tablet mass enters the matrix by the movable shoe which hinge attached to the funnel. Feed unit of similar design reduces the likelihood of separation and destruction granulate tablets. Performance of intermediate machines equivalent sled machines.
Tablet weight is determined by the bulk and compacted volume and set by adjusting the position of the lower punch. The thickness of the tablets is determined by the position of the upper punch and the compression pressure, which varies according to the resistance of the tablet weight. Quality control pills should be implemented one day after the end of the compaction process, since the deformation of the tablets.

To all the questions related with production of tablets you can find answers on resource www.Tabletpress.ru