tablet press machine

Automatic tablet press ‌ is a kind of high efficiency, automatic solid tablet press equipment, widely used in pharmaceutical, food, chemical industry and so on. Its main function is to press particles into circular, shaped and flake with text, symbols and graphics with a diameter of no more than 13mm, to achieve automatic continuous production. The working principle of the automatic tablet press is based on the basic components of the punching and die, through the structure and shape of the punching die, as well as the cooperation of the upper and lower punching, the appropriate pressure is applied in the pressing process to press powder or other granular materials into tablets. The equipment has the advantages of high efficiency, high precision and high automation, which can ensure the quality and stability of tablets, reduce manual operation and error, and improve production efficiency ‌.

The main structure of automatic tablet press includes hopper, tablet press mechanism, control part and auxiliary parts. First, the material is filled into the hopper, and then the material is quantitatively fed into the tray prepared by the sheet pressing mechanism through the hopper's dosing device. Next, the material is fed into the tablet pressing mechanism by a high pressure pump and the tablets are bonded together. During the pressing process, the hardness and shape of the tablet can be controlled by adjusting the pressure and time of the tablet press. The wide application of automatic tablet press benefits from its characteristics of high efficiency, automation, safety and hygiene, which makes it occupy an important position in the tablet process research of the pharmaceutical industry ‌.

The working principle of automatic tablet press:

1. Punching and die: punching and die is the basic parts of automatic tablet press, each pair of punching die is composed of three parts: upper punching, middle punching and lower punching. The structure of the upper and lower punch is similar, and the diameter of the punch is equal, and the punch of the upper and lower punch is matched with the die hole of the middle die, which can slide freely up and down in the middle die hole, but there is no gap that can leak the powder. Die processing size is a unified standard size, with interchangeability. The specifications of the die are expressed by the diameter of the punch or the aperture of the middle die, generally 5.5-12mm, each 0.5mm is a specification, and there are 14 specifications.

The punch and die are subjected to great pressure during the pressing process, and are commonly made of bearing steel (such as crl5, etc.) and heat treated to increase its hardness.

There are many types of punches, and the shape of the punch depends on the desired shape of the tablet. According to the structure shape of the die, it can be divided into circles and special-shaped (including polygons and curves); The shape of punch section has plane shape, bevel shape, shallow concave shape, deep concave shape and comprehensive shape. Flat and bevelled punches are used to press flat cylindrical tablets, shallow concave is used to press double convex tablets, deep concave is mainly used to press chips coated tablets, and comprehensive shape is mainly used to press special-shaped tablets. To facilitate the identification and administration of drugs. Marks such as drug name, dosage and vertical and horizontal lines can also be carved on the end face of the die. Pressing different doses of tablets, should choose the appropriate size of the die.

2. The working process of automatic tablet press

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

① The punch part of the downward punch (its working position is upward) extends into the middle die hole from the lower end of the middle die hole to seal the bottom of the middle die hole;

② Fill the middle die hole with medicine by means of an adder;

③ The upper punch part (its working position is downward) falls from the upper end of the middle die hole into the middle die hole, and the downward stroke is certain to press the powder into a piece;

④ The upstroke lifts out the hole, and the downstroke rises the pill out of the middle die hole to complete a tablet pressing process;

⑤ Flush down to the original position, ready for the next filling.