How to clean up the carbonization of residual glue in hot melt adhesive cans? Explain the reasons, steps, and prevention in one go

The correct sequence for carbonization of residual glue in the glue can is:First, cool down to the softening range where the glue can still flow (about 120-140); Drain the remaining adhesive (℃), then use specialized cleaning adhesive or high flash point cleaning agent to circulate and soften the carbon residue, and finally use a copper brush or wooden scraper to remove itAvoid using high-temperature hard shovels, steel wire balls, and ordinary diluents – the former can scratch the coating inside the can, while the latter can contaminate the next batch of glue after residue.

Why does it carbonize

• Long term high-temperature insulation.Leaving work without cooling down, idling at noon for insulation, glue at 180 ° C; If the temperature stays above ℃ for a long time, it will inevitably oxidize and form a crust.
• The tank is not emptied for a long time.The old glue at the bottom has not been used up and has been repeatedly heated, causing it to crust first and then burn.
• Mixing different grades or manufacturers of adhesive.Incompatibility of the system can cause delamination, precipitation, and accelerate carbon deposition.
• Impurities and ash content are relatively high.Low priced miscellaneous rubber has a high ash content and is itself a source of carbon deposition.

Cleaning steps

Prevention is more cost-effective than cleaning

• Set standby temperature: briefly shut down to 120 ° C; Around ℃, do not use 180 throughout the entire process; ℃.
• Add a small amount of material multiple times, keep the liquid level in the tank above 1/3, but do not fill the tank with glue for a long time.
• Fixed weekly emptying to bottom out, monthly deep cleaning and recording.
• Fixed brand, clean the can before changing the glue, do not pour new glue on half of the old glue.

Frequently Asked Questions (FAQ)

Q: There are black spots on the adhesive, but it does not affect the bonding. Can it be postponed until the next maintenance?
Answer: Not recommended. The black dot indicates that the carbon residue is already peeling off, and it is highly likely that the filter screen and nozzle will be blocked in the future. The shutdown loss is much greater than a single cleaning.

Q: Can I clean it with gasoline or thinner?
Answer: No. Low flash point, high safety risk, and residue can lead to foaming and abnormal viscosity in the next batch of adhesive.

Q: Can switching to low ash rubber particles really reduce carbon deposition?
Answer: It can significantly reduce. Rubber particles with low ash content and good thermal stability are less prone to skin formation under long-term insulation, which is also the reason why the thermal stability factor should be considered when selecting materials.

Sunlifehot melt adhesiveBefore leaving the factory, high-temperature thermal stability verification will be conducted, and Guangzhou Sunlife Trading can also provide insulation temperature and cleaning cycle suggestions based on customer equipment conditions to minimize unplanned shutdowns.