Causes and solutions for the brittle body of the effervescent tube

The quality of medicine packaging directly affects the storage of medicines and even endangers the health of patients. The effervescent tube is a special packaging for large-dose tablets such as effervescent tablets and candy compressed tablets. Sometimes the bottle body may become brittle. What causes this?

144mm*29mm effervescent tablet tube

The effervescent tube is generally processed by injection molding. The bottle body is brittle refers to the cracking or fracture of some parts. It is mainly due to the degradation of the material that causes the macromolecules to break, which reduces the molecular weight of the macromolecules, thereby making the polymer as a whole Physical performance is reduced. It can be solved by the following methods:

In terms of materials, set proper drying conditions before injection molding. If you continue to dry for a few days or the drying temperature is too high, although volatile moisture and other substances can be removed, it is also easy to cause material degradation, especially heat-sensitive plastics. Reduce the use of recycled materials and increase the proportion of virgin materials.

In terms of process conditions, reduce the temperature of the barrel and nozzle, reduce the back pressure, injection pressure, screw speed and injection speed, reduce the generation of excessive shear heat, and avoid polymer decomposition. If it is brittle due to insufficient melt mark strength, the melt mark strength can be increased by increasing the melt temperature and injection pressure. Reduce mold opening speed, ejection speed and ejection pressure.

In addition, to solve the problem of brittleness of the effervescent tube body, it is also necessary to select a suitable screw for the injection molding machine, and the temperature distribution during plasticization is more uniform. If the temperature of the material is uneven, too much heat will easily accumulate locally, leading to degradation of the material.