Analysis of the causes of black spots on the body of the effervescent tube

The appearance of the packaging plays an important role in the sales of the product and its own competitiveness, and the same is true for medicines. Effervescent tubes are mostly used in medicines with high requirements for moisture resistance, such as effervescent tablets, candy tablets, etc. Sometimes we may find that the bottle body has dark spots or impurities of different shades. What is causing this?

21mm*92mm plastic tube for effervescent tablet

The main reasons for black spots or impurities on the body of the effervescent tube are as follows:

1. Mold: If the gates of the mold are too small or rough, too much frictional heat will occur. If the mold exhaust is not good, it will cause the gas to burn and produce obvious black stripes. The wear of the mold and the machine will also cause the friction debris to fall into the mold. Cavity surface.

2. Forming link: The screw barrel is prone to carbonization of the resin due to long-term heating, and then poor black spots; the flange is prone to dead corner resin accumulation and carbonization; poor spherical contact, poor sealing, and long resin are prone to occur at the nozzle. Residual carbonization over time.

desiccant cap

3. Production environment: tidying up and cleaning must be thorough, otherwise the floating dust will fall on the surface of the cavity, which will naturally lead to poor product quality.

4. Raw material: The raw material itself has black spots, or it is damaged or contaminated during transportation and storage, mixed with foreign matter; some materials require more lubricants, if they increase and lack, friction heat will occur, and the exhaust gas will be swept away. If not in time, black streaks (dark spots) will be formed when gas is burned.

29mm*144mm effervescent tubes supplier

There are many reasons for the black spots or impurities in the effervescent tube body. It is necessary to investigate one by one, find the exact cause, and control each production process in order to produce high-quality packaging.