Rotary tablet press is a commonly used pharmaceutical equipment, mainly used to press powdered or granular raw materials into tablets of various specifications. It compresses raw materials into tablets of the desired shape and size through a series of working steps, with advantages such as simple process, high production efficiency, and convenient operation. This machine is widely used in industries such as pharmaceuticals, food, ceramics, and chemicals. Below, we will provide a detailed introduction to the factors and solutions that affect the weight difference of rotary tablet presses:
Factors causing weight differences exceeding the limit and solutions:
1) The uneven distribution of particle thickness and different particle flow rates during compression result in uneven particle thickness when filling the middle mold holes. For example, if there are more coarse particles, the tablet is lighter, and if there are more fine particles, the tablet is heavier. The particles should be mixed evenly or sieved to remove excess fine powder.
2) If fine powder adheres to the punch and causes a hanging punch, it can result in a significant difference in sheet weight. At this time, the downward rotation is not flexible, and it should be checked in a timely manner. Remove the die and clean the downward and middle die holes.
3) Poor particle flowability results in varying amounts of particles flowing into the middle mold hole, leading to differences in sheet weight. It is necessary to re pelletize or add suitable flow aids such as micro powder silica gel to improve the flowability of the particles.
4) The feeding hopper is blocked, which often occurs in drugs with strong viscosity or hygroscopicity. The feeding hopper should be unblocked to maintain a dry compression environment, and appropriate flow aids should be added to solve the problem.
5) For those with forced feeders, the rotation speed of the forced feeder pulley does not match the rotation speed of the turntable. It should be adjusted to be consistent.
6) The length and length of the downward punch are uneven, exceeding the tolerance, resulting in uneven filling volume. Should be repaired.
7) The axial movement of the powder measuring rod of the tablet press causes inaccurate measurement and results in differences in tablet weight. Check whether the small turbine is worn and adjust the worn parts.
8) Improper installation of the feeder results in insufficient flow and unstable filling volume inside the feeder. The position of the feeder should be adjusted to increase the logistics volume of the feeder.