How often should the hot melt glue pot be cleaned? Detailed explanation of cleaning cycle and daily maintenance methods

How often is it appropriate to clean the glue pot?

The cleaning cycle of the glue pot depends on the amount and type of glue used. General recommendation: Thoroughly clean every 2-3 months under continuous production conditions; Intermittent use (less than 3 days per week) can be extended to 4-6 months. But in the following situations, immediate cleaning is required:

• The color of the adhesive solution noticeably darkens (precursor to carbonization)
• There are black slag particles at the glue outlet or a burnt smell in the glue liquid
• Abnormal decrease in adhesive strength and granular sensation in the adhesive layer

Cleaning steps for glue pot

• 1. Drain the residual adhesiveHeat the remaining glue particles in the glue pot until they are completely melted and discharge them from the glue outlet
• 2. Hot oil flushingPour in an appropriate amount of high-temperature resistant cleaning oil (or mineral oil), heat and cycle at 170 ° C for 10 minutes to dissolve wall coking
• 3. Wipe the inner wallWipe off loose coking layer with heat-resistant non-woven fabric to avoid scratching the coating with a metal shovel
• 4. Preheating of empty glueAdd a small amount of new adhesive particles to melt and discharge, taking away residual cleaning oil
• 5. Add new ingredientsAfter confirming that the gel is clear and free of impurities, it is officially added for production

Key points of daily maintenance

The temperature of the glue pot should not exceed 200 ° C for a long time (the recommended working temperature for EVA glue particles is 160-180 ° C), as high temperature is the main cause of coking; If the shutdown exceeds 2 hours, the insulation temperature should be reduced to 120 ° C or the machine should be shut down; Avoid compatibility issues caused by mixing different brands of adhesive particles. Sunlifehot melt adhesiveThe particles are uniform and have good thermal stability. The carbon deposition of the glue pot is significantly lower than that of inferior glue particles after long-term use. Guangzhou Sunlife Trading can provide matching cleaning guidance.

Frequently Asked Questions

• Q: Can the coking of a glue pot be scraped off with a knife?
  A: Not recommended. The metal shovel will scratch the PTFE coating on the inner wall of the glue pot, accelerating subsequent coking. Suggest using cleaning oil and non-woven fabric for soft wiping.
• Q: Do I need to wash the pot when changing the color of different colored rubber particles?
  A: When changing from dark to light, it is necessary to wash. To change from light to dark, you can first add about 1kg of glue for transition.