Instant opening of express cardboard box with hot melt adhesive particles: a record of changing adhesive in a commercial warehouse

To make a “tear open” express delivery box, the key is not to stick it more firmly, but to make itThe adhesive strength is slightly lower than the fiber strength of the cardboardWhen tearing, the adhesive interface separates first, and the paper surface is not broken or layered. Choose the right box for sealingHot melt adhesive granulesBy combining with quantitative dispensing, it is possible to ensure that consumers can tear it to the bottom without opening it during transportation.

Problems encountered by customers

A daily necessities e-commerce warehouse in Guangdong, with an average of about 12000 containers per day. Previously, high-strength sealing adhesive was used for shipping with zero complaints, but consumers provided feedback that “it must be cut open with a knife”, and customer service received several compensation claims for scratched products. After replacing it with cheap low-strength adhesive, it was easy to tear, but in the hot summer, the box cover appeared to be lifted in the carriage, and there were more than 40 boxes with loose openings during secondary sorting.

Diagnosis: Three parameters were twisted incorrectly at the same time

• The adhesive dots are too thick and too long.The original process is 60; Mm long strip adhesive, when torn open, the cardboard is first torn apart. It looks like it cannot be torn open, but in fact, the adhesive is too wide.
• The softening point is relatively low.The one that needs to be torn and replaced is only 72; In summer, the temperature inside the carriage exceeds 55 ℃; Creep begins at ℃.
• Insufficient pressing time.After increasing the speed of the conveyor belt, the pressure roller cannot contact 1; In seconds, the glue had not fully engaged before entering the next station.

Adjustment plan and results

After switching to the corresponding brand of Sunlife hot melt adhesive, track for one month: tear open 200 boxes for testing, and tear 191 boxes once without breaking the paper surface; High temperature simulation (60 ℃ maintained at 4 ℃); Stacking after hours without self opening; The consumption of glue per box has decreased by about 38%, and based on an average of 12000 boxes per day, the amount of glue saved in one month is more considerable than expected.

Three reusable experiences

• Good tearing relies on a “few but accurate” dispensing arrangement, not on reducing the quality of the glue.
• The summer plan must be based on the highest carriage temperature, and the softening point cannot be selected according to the normal temperature of the warehouse.
• When changing the adhesive, the pressing time must be checked at the same time, otherwise the parameters will conflict and the problem will be attributed to the wrong material.

Frequently Asked Questions (FAQ)

Q: Will having a meeting immediately after tearing it apart be considered as “poorly packaged”?
Answer: Just pass the drop and stack tests. Firm and easy to open are achieved through interface design, not contradictory options.

Q: Can recycled cardboard boxes be made?
Answer: Yes, but the surface strength of recycled paper is lower, and the adhesive dots should be shorter and increased appropriately. It is recommended to make a small batch of samples first.

Guangzhou Sunlife Trading can come to your door to pick up the box board for sampling, and provide adhesive layout suggestions according to your carton weight, model, and shipping season to avoid “changing the adhesive for three months”.