How to deal with the moisture and clumping of hot melt adhesive granules during the rainy season? 5 Storage Mistakes, Distinguishing and Repeating Again

plum rain seasonHot melt adhesive granulesAgglomeration, mostly not due to glue spoilage, but ratherMoisture absorption+temperature fluctuationCausing mutual adhesion between particle surfaces. The principle of handling is simple: mild adhesion can be spread out and left to air, and after being dispersed, it can be used as usual; If there is obvious moisture absorption, whitening or odor, do not pour it directly into the rubber can, otherwise it will bubble, spray needle drawing, and even carbonize and block the mesh.

Misconception 1: Discard clumps as waste

The particles slightly agglomerate due to high-temperature softening, and the cross-section remains clear and free of white spots even after being opened, with little impact on their performance. Spread in a well ventilated and cool place for 2-4 hours, and before bagging, use your hands to disperse. What really needs to be scrapped are those with white, crispy or sour cross-sections.

Misconception 2: Sunbathing or direct drying

Exposure to sunlight and high-temperature ovens can soften the surface of particles, causing them to dry into a whole piece, which is actually more difficult to use. The correct approach is to dehumidify at room temperature: remove the dehumidifier from the warehouse and control it at 30 ° C; Dry naturally in the shade below ℃ and relative humidity below 60%.

Misconception 3: Open the bag and leave it open after unpacking

This is the most common action during the southern rainy season. After opening the bag, if you don’t need to finish it for a day, you should tightly wrap and tie the inner bag opening before putting on the outer bag. Half a ton of material is left open overnight in a damp workshop, enough to absorb enough moisture to cause pinholes in the adhesive layer.

Misconception 4: Plastic bags stacked on the wall

Misconception 5: Mixing clumped materials with new materials and pouring them together

The addition of additives will cause two types of melting states in the glue tank, with viscosity fluctuating and the amount of glue floating along with it. If needed, use up a separate batch and prioritize running live parts with low appearance requirements on the same day. At the same time, increase the frequency of filter inspection once.

Frequently Asked Questions (FAQ)

Q: How long is the shelf life of hot melt adhesive granules?
Answer: The original packaging is unopened and stored in a cool and dry place for 12-18 months. It is recommended to use it up within a month after opening the bag, as the rainy season is shorter.

Q: How to quickly determine if it has absorbed moisture?
Answer: Take a small amount and put it into the hot tank. If there are obvious bubble sounds and small bubbles on the surface, it means that the moisture content is too high. The batch should be stopped and left to dry for treatment.

Q: What if there is no dehumidifier in the workshop?
Answer: At least achieve the three steps of raising the tray, leaving gaps away from the wall, and tightening the inner lining bag at will, which have zero cost and can prevent most problems.

The Sunlife hot melt adhesive produced by Guangzhou Sunlife Trading adopts double-layer moisture-proof inner lining packaging, and the production date is marked according to the batch, making it convenient for customers to execute first in, first out. If the rainy season in your area is longer, you can replenish in small batches on a monthly basis and use inventory turnover to replace large-scale stockpiling.