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The lower punch is raised to the required level in the die to get the required weight of granules in the punch-die cavity. The excess granules are scraped from the surface of the die table.
The metering method is similar to the process used to determine the weight of flour during the making of a cake.
Compression: During the compression stage, the top and bottom punch tablet tooling come together by pressure within the die to form the tablet.
As the punches enter into the compression stage, the top and bottom punches move between two large wheels called compression rolls.
These compression rolls push the punches to words the die to form the product. So, the distance between the top and bottom punches determines the thickness and the hardness of the tablets.
When the punches are so close together, a thin and hard tablet is created.
Today AWC auto weight control machine is used for a better result. Ejection: The ejection procedure for the tablet compression process involves removal of the tablet from the lower punch-die station.
These all four steps are explained below: 1. Filling: This procedure of the tablet compression machine involves the transfer of the granules into position for tablet compression. The ultimate product is then blended into the homogeneous blend. Then the mixture flows to the compressing tool punch-die cavity. The punch-die cavity is made of punch-die and lower punch.
Then the position of lower punch in the die is responsible for the volume of the cavity. This volume must be appropriately adjusted for the weight of granules to be compressed to make the tablets. Metering: The metering procedure for the tablet compression procedure involves removal of excess granules from the compression machine. At this stage, the required weight volume of granules to be compressed into tablets is controlled by the height of the lower punch in the die and the height of the lower punch is controlled by the metering cam.
The lower punch is raised to the required level in the die to get the required weight of granules in the punch-die cavity. It also makes it possible to multiply the force as needed. If we increase the hydraulic pressure more compressing force on tablet then it becomes more hard. Different Stages of Tablet Compression Process: Tablet compression process is divided into four distinct stage.
These stage including filling, metering, compressing and ejection. Filling: The filling stage of tablet compression process involves transfer of raw materials into position for tablet compression.
These raw materials have undergone prior processing by wet granulation, dry granulation roller compaction , sizing or other process. The final formulation is then blended to yield a homogeneous blend.
The blend then flows to the compressing machine punch-die cavity. The punch die cavity is composed of punch die and lower punch.
The position of lower punch within the die determines the volume of the punch-die cavity. This volume must be appropriately sized for the weight of granulation to be compressed into tablets.
The granulation is overfilled on the die table turret to ensure complete filling of the punch-die cavity volume.