Hot melt adhesive is more and more widely used in carton packaging

As a new type of carton and paper box packaging sealing form, hot melt adhesive sealing has replaced the traditional binding packaging and tape packaging, used in the carton packaging of all kinds of food, as well as wine, dairy products and other carton packaging. Because of the advantages of good packaging quality, beautiful appearance and low cost, the application of hot melt adhesive sealing box will be more and more widely.

Advantages of hot melt adhesive sealing

Hot melt adhesive box sealing is to use the hot melt machine to melt the hot melt adhesive into liquid, and then through the hot melt machine throat and gun, sent to the surface of the carton, hot melt adhesive cooling is completed after bonding. It can meet the requirements of carton sealing, and overcome the defects of the traditional carton sealing form.

Good packing quality

Transport cartons must be able to withstand changes in temperature, humidity and rougher handling, but the use of adhesive tape is more difficult to meet this requirement, because of its poor adhesion strength, tensile strength is small, and for coated or oily cardboard adhesion.

And hot melt adhesive and wet things have good binding force, strong permeability, in corrugated paper and liner board at the same time play a physical and chemical bonding role, after bonding the overall strength of the carton, the carton is not easy to deformation and cracking. In addition, hot melt adhesive coating system can be applied to a variety of different shapes of key parts, such as: carton folding cover.

Secondly, the low temperature resistance of the self-adhesive belt is poor, and it is easy to open in the cold climate of the north. Hot melt adhesive has good low temperature resistance and can withstand low temperature of -40℃. And, hot melt adhesive storage period of up to 2 years, storage space is small, no storage special requirements; The adhesive tape storage period of validity is only half a year, but also requires certain storage conditions, otherwise easy to deteriorate.

Hot melt adhesive also provides a good anti-theft function, as any attempt to open the carton will tear the fibers as the adhesive penetrates into the corrugated. Tape can be cut with a knife, unknowingly removing the contents and sealing them again.

Appearance is beautiful

Nowadays, the business requires that the packaging not only transmits the goods, but also conveys the image of the product and the company through the packaging pattern design. As a result, the fewer obstacles in appearance, the better. Adhesive tape often blocks images and interferes with the transmission of packaging information. The hot melt adhesive is bonded between the broken wings, which can provide a larger display space.

The cost is low

Using hot melt adhesive sealing speed, the whole bonding process only needs 1~3 seconds can be completed, suitable for mass production, less energy consumption, low cost. The sealing cost of hot-melt adhesive for standard corrugated boxes is about 32 yuan /1000 cases, which is the middle price of hot-melt adhesive, and the middle price of tape sealing is about 120 yuan /1000 cases.

If hot melt adhesive is used, adding glue in the processing process will not cause shutdown; Replacing tape would require downtime. Moreover, the box is not equipped with a partition board, the sealing strength is greater than the tape sealing strength of the internal partition board, can reduce the cost of the partition board.

Hot melt adhesive selection

The affinity between hot melt adhesive and different bonded materials is different. In order to make hot melt adhesive better to play the "stickiness", the following factors should be carefully considered when choosing hot melt adhesive.

Color: because the color of the adhesive is different, the color requirements of hot melt adhesive should be different. If the adhesive itself has no special requirements for color, it is recommended to use yellow hot melt adhesive. Generally speaking, yellow hot melt adhesive is better than white viscosity.

Surface treatment of the adhesive. The surface treatment of hot melt adhesive is easy, not as strict as other adhesives, but the dust and oil on the surface of the adhesive, should be properly treated to make the hot melt adhesive play a better role in bonding.

Homework time. Quick operation is a major characteristic of hot melt adhesive. The operation time of hot melt adhesive is about 15 seconds. With the wide application of modern production mode - assembly line, the operation time of hot melt adhesive is becoming shorter and shorter.

Temperature resistance: hot melt adhesive is more sensitive to temperature. When the temperature reaches a certain degree, the hot melt adhesive begins to soften. Below a certain temperature, hot melt adhesive will become brittle, so the choice of hot melt adhesive must take full account of environmental temperature changes.

Stickiness: the stickiness of hot melt adhesive is divided into early stickiness and late stickiness. Only the early viscosity and late viscosity is consistent, in order to make the hot melt adhesive and the adhesive to maintain stability. In the production process of hot melt adhesive, it should be guaranteed to have antioxidant, halogen resistance, acid and alkali resistance and plastic.