Technology and principle of the press machine

Technology and principle of the press machine

1. Punch

The Punch is a press mold pressing tablet, working face, the formation of the surface shape of the tablet punch, Punch is the diameter of the aperture.

The Punch is the main working parts of tabletting machine, usually a Punch includes three parts, mold, on the structure of the undershoot undershoot, similar to the punch diameter are equal, with up and down the punch diameter and in mould hole and can slide up and down freely in the Punch hole, but not there is a gap can leak powder.

According to the structure and shape of the Punch, it can be divided into circular and irregular shape. Punch the shape of the end surface of a plane shape, edge shape, shallow concave, deep concave and shaped, flat, cylindrical bevel shaped punch for tablet pressing flat, shallow concave for pressing double convex tablets, deep concave main press coated tablet chip, integrated form is mainly used to suppress special-shaped tablets. In order to facilitate the identification and use of drugs, in the face of Punch can also be carved with the name of the drug, dosage and vertical lines mark. In order to suppress different doses of tablets, the suitable punching Punch should be selected.

2. The working process

The working process of the press can be divided into the following steps:

The punch parts 1, undershoot (its location up) by the Punch hole in the lower end extends into the Punch hole, sealed in the bottom of the hole;

2, the use of drugs to fill in the feeder holes;

3. The head of the punching punch (its working position down) falls into the middle Punch hole from the upper end of the middle mold hole, and down a certain stroke, and the powder is pressed into pieces.

4, the upward push up the hole. The top of the tablet increased lower Punch hole, a pressing process;

5, down down to in situ, ready for the next filling.

3.Principle 

3.1. dose control

All kinds of tablets have different dosage requirements, and large dose regulation is achieved by selecting punch Punchs with different punch diameters. After choosing the Punch size, small dose adjustment is by adjusting the depth of the hole into the Punch down, thus changing the actual length in the Punch hole sealing after, to adjust the Punch hole

The purpose of the filling volume of the drug. Therefore, should have the original position adjustment undershoot in the mold hole the mechanism in the tablet machine, in order to meet the requirements of dose adjustment.

3.2 Control of thickness and hardness of tablet

The dosage of the drug is determined according to the prescription and the Pharmacopoeia, and can not be changed. In order to store, save, and disintegrate time limit, pressure is also required for a certain dose of pressure, and it will also affect the actual thickness and appearance of the tablets. Pressure regulation is essential for pressing. This is achieved by adjusting the downside amount of the punch in the Punch hole. Some press during the tabletting process not only on the downward movement, upward movement but also has lower, up and down by the relative motion to complete the tabletting process. But the pressure regulation is to adjust and control the pressure by adjusting the mechanism of the downlink.

5.Classification 

The press machine can be divided into single stamping machine and multi punching rotary press.

The tablet press is through the cam (or eccentric) linkage (similar to the principle of the punch) up and down, so that the relative motion and suppress tablets. The single punch is not necessarily only a pair of Punchs, but also two or more, but many stamping Punchs are stamped at the same time, which causes the stability and reliability of the mechanism to be strict, and the structure is complex. Single stamping machine is intermittent production, batch feeding, intermittent release, production efficiency is low, suitable for test room and large size tablet production.

Impact rotary press is the deputy is at work on the circumference of the turntable Punch like device, lifting up and down the rail tail by fixed control. When the up and down with the rotary synchronization, and by rail control of axial movement, thus completing the tabletting process. At this time the process of the press machine is continuous, continuous feeding, continuous out of the sheet. As far as the whole machine is concerned, the force is more uniform and stable, and is widely used in the formal production.