Causes of hot melt adhesive drawing
Occasionally, there are a few filaments remaining when the nozzle is closed, causing equipment pollution, or adhering to the side of the guide bar, pressure plate, etc., which will cause problems to the appearance and operation of the box that needs to be packaged later. Influence.
After the observation and analysis of this phenomenon and the opinions provided by experts in the industry, the main reasons can be attributed to the following aspects:
1. The operating temperature is too low. This situation needs to be improved by increasing the operating temperature (not exceeding the specified temperature)
2. The melt viscosity of the hot melt adhesive is too high. This situation can be partially alleviated by increasing the operating temperature, but the most fundamental thing is to replace the appropriate type of hot melt adhesive
3. The adherend is too far from the nozzle. In this case, the distance between the adherend and the nozzle needs to be adjusted under the premise of the equipment structure.
4. The ambient temperature is too low. The improved method In the case where the ambient temperature cannot be adjusted, it can be considered to increase the operating temperature, but it is also limited to the specified temperature, or use other hot melt adhesives used at low temperatures, especially the curing time.
5. The nozzle is too dirty. Need to clean the nozzle in time
6. The nozzle is not closed properly. Nozzle cleaning and overhaul required
7. The hot-melt adhesive has been in the plastic box for too long, and the hot-melt adhesive itself has been carbonized and decomposed. In this case, the hot melt adhesive in the glue box needs to be drained, and the operation should be carried out according to the process of newly starting the glue.
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