Low temperature hot melt adhesive particle sealing guide: How to adjust the opening of express cardboard boxes to prevent bursting in winter

Directly speaking, the method is to seal the box in winter without bursting, relying on three things: “low-temperature glue+temperature control+coating amount”

In winter, when express cardboard boxes burst and open, it is mostly not due to poor quality of the glue, but rather the fact that the sealing glue that works well at room temperature becomes brittle and loses its stickiness in low-temperature environments. The solution is to replace it with a low-temperature resistant oneHot melt adhesive granulesAdjust the glue temperature and coating amount to the appropriate range, and pay attention to the moisture content of the cardboard box.

Step 1: Select the right low-temperature adhesive particles

Ordinary sealed EVA adhesive will gradually harden and its impact resistance will decrease below 0 ℃, and it will crack upon impact. Special hot melt adhesive particles with the nominal “low temperature resistance/antifreeze” should be selected for sealing. This type of adhesive can be modified to press the brittleness temperature to -10 ℃ or even lower, and still maintain toughness at low temperatures. Sunlife Hot Melt AdhesivePackaging and Sealing SeriesThere are low-temperature models for e-commerce cold chain and winter in the north.

Step 2: Stabilize the temperature of the adhesive

Step 3: Coating amount and shape

• Thread or spiral spray, more uniform force distribution than single point, resistant to drops.
• The more coating amount, the better: too much glue overflow, slow cooling; Too little to stick firmly. Select 2-4mm adhesive width according to the weight of the cardboard box.
• The folding joint should be compacted, leaving 1-2 seconds for the adhesive to solidify.

Step 4: Don’t ignore the cardboard box itself

The moisture content of the cardboard box is too high, making it difficult for the adhesive to penetrate and prone to false bonding; If it is too dry, the glue will absorb quickly and the opening time will be shortened. The most stable range is 8% -12%. If there is dust or wax on the surface of the recycled cardboard box, it is necessary to first remove the dust or choose a glue with stronger adhesion.

FAQ

Q: Can we raise the glue temperature to compensate for the low temperature?
Answer: No. Excessive temperature can only cause carbonization, wire drawing, and paper box ironing, but it can also be more explosive and damage equipment.

Q: Does the southern region also need low-temperature glue in winter?
Answer: If there is no heating in the warehouse, and the goods are transported to the north or cold chain, it is still recommended to use low-temperature models and choose according to the “worst transportation environment”.

Q: Do I need to change the equipment to change the low-temperature adhesive?
Answer: Usually not needed. The temperature range of most sealing spray glue machines is sufficient. Guangzhou Sunlife Trading can provide machine temperature and coating suggestions according to your model, and send samples to test one or two lines first.

One sentence: In winter, sealing the box without bursting the mouth=low temperature resistant rubber particles+calibrated rubber temperature+appropriate coating amount+controlling the moisture content of the cardboard box. Four steps together are necessary to ensure stability.