As friends know, after using a hot melt glue machine for a long time, there will be a layer of black material around the glue tank, which is the carbide of hot melt glue. How are these carbides formed? What should we do to avoid excessive carbide formation in hot melt adhesive? In fact, the production of carbides mainly includes the following points:

1. If the temperature of the glue cylinder is set too high, some glue machines may experience temperature control failures after prolonged use. The actual temperature may be lower than the displayed temperature, or the temperature may be much higher before the control function can be activated, causing damage to the glue properties and resulting in wire drawing. Improper maintenance and repair can cause carbonization of the glue, leading to blockage of the glue machine, hose, and gun.

2. Carbonization of the adhesive layer on the surface of the hot melt glue cylinder

3. Hot melt adhesive itself has poor thermal stability

4. Hot melt adhesive is repeatedly heated for a long time in the glue tank

5. There are two different types of hot melt adhesive in the glue tank

For the above reasons, the following aspects need to be achieved in the daily use of glue to avoid carbonization:

1. The temperature of the adhesive is set according to the specified technical parameter values


2. Check the difference between temperature control and actual temperature when there are abnormal phenomena such as carbonization

3. The lid of the glue box should be closed at all times to prevent the high-temperature hot melt adhesive on the surface from coming into contact with fresh air and accelerating oxidation. Hot melt adhesive that has been repeatedly heated for a long time should be cleaned and replaced with new adhesive


4. Do not use two different properties of hot melt adhesive