Hot melt adhesive

1 Hot melt adhesive is widely used in carton outer packaging as a new type of carton and carton packaging sealing form Hot melt adhesive sealing has partially replaced the traditional binding packaging and tape packaging, and is applied to the carton outer packaging of various food products and wine, dairy products and other products Due to the advantages of good packaging quality, beautiful appearance and low cost, the application of hot-melt adhesive seal box will be more and more extensive Advantages of case sealing: case sealing is to melt into liquid by using a hot-melt machine, and then send it to the surface of the carton through the throat and spray gun of the hot-melt machine, and then complete the bonding after cooling It can meet the requirements of carton sealing and overcome the defects of the traditional form of carton sealing Good packaging quality: the transport carton must be able to withstand the temperature, humidity changes and rough handling, but it is difficult to meet this requirement by using adhesive tape, because of its poor bonding strength, small tensile strength, and for coated or oily cardboard, it can not be firmly adhered It has good binding force and strong penetration with wet materials It also plays a physical and chemical bonding role between corrugated paper and linerboard After bonding, the overall strength of the carton is enhanced, and the carton is not easy to deform and crack In addition, the coating system can press the glue on the key parts of different shapes, such as the folding cover of the carton Secondly, the low temperature resistance of the adhesive tape is poor, in the cold climate in the north, it is easy to open; the low temperature resistance is good, it can withstand - 40 ℃ low temperature Moreover, the storage period is up to 2 years, the storage area is small, and there is no special requirement for storage; while the storage period of tape is only half a year, and certain storage conditions are also required, otherwise it is easy to deteriorate It also provides a good anti-theft function, because the adhesive penetrates into the corrugated box, any attempt to open the carton will tear the fiber The tape can be cut with a knife, and the contents can be removed unconsciously and sealed again Beautiful appearance: Nowadays, the business requires that the packaging can convey the product and company image through the packaging design while delivering the goods Therefore, the less factors that hinder the appearance, the better The tape often blocks the image and interferes with the transmission of packaging information; instead, it is glued between the folding wings to provide a larger display space Low cost: fast sealing speed, the whole bonding process can be completed in 1-3 seconds, suitable for mass production, low energy consumption, low cost The sealing cost of standard corrugated box is about 32 yuan / 1000 boxes, which is the middle price of, while the middle price of tape sealing is about 120 yuan / 1000 boxes If it is used, adding glue during the processing will not cause shutdown, while replacing the tape requires shutdown Moreover, the box may not be equipped with partition board, and the sealing strength of the box is greater than that of the box with partition board when the rubber belt is used to seal the box, which can reduce the cost of the partition board Selection of melt adhesive: different from the affinity of different materials to be bonded, in order to make better use of "Stickiness", the following factors should be carefully considered in selection (1) color: due to the different colors of the adherends, the color requirements should be different If there is no special requirement for the color of the adhesive, yellow is recommended Generally speaking, yellow is better than white (2) surface treatment of the adherend: the surface treatment of the adherend is not as strict as that of other adhesives, but the dust and oil stain on the surface of the adherend should also be properly treated to better play the bonding role (3) operation time: fast operation is a major feature The operation time is generally about 15 seconds With the wide application of modern production mode pipeline, the required operation time is shorter and shorter (5) temperature resistance: sensitive to temperature When the temperature reaches a certain degree, it begins to soften; when it is lower than a certain temperature, it will become brittle, so the selection must fully consider the change of ambient temperature (6) viscosity: the viscosity can be divided into early viscosity and late viscosity Only when the early viscosity is consistent with the later viscosity can the bond be kept stable In the process of production, it should be guaranteed to have the properties of oxygen resistance, halogen resistance, acid and alkali resistance and plasticization 2 Dialysis the hot spot of demand in China's Adhesive Market in the next 5-10 years In the next 5-10 years, China's adhesive consumption will still grow at the rate of 8% - 10%, and the development direction is as follows: 1 Urea formaldehyde adhesive with low formaldehyde emission; With the improvement of people's living standard and environmental protection awareness, the environmental protection requirements for artificial board will be higher, so the market potential of urea formaldehyde adhesive with low formaldehyde emission is huge At present, foreign companies have produced urea formaldehyde glue with low formaldehyde emission in China, and set up large-scale wood processing plants 2 No organic flux is used, and the construction is rapid and the bonding effect is good It is a kind of glue with rapid growth of Zui demand in recent years, and it is also the development direction in the future In addition to the traditional EVA, there is an urgent need to develop new varieties of polyester and polyamide in China 3 Polyurethane adhesive is widely used in shoemaking, packaging, construction, automobile and other fields Because of its excellent performance, it is considered to be one of the potential adhesives for Zui in China In developed countries, all the adhesives for shoe making are polyurethane adhesives, all the composite films for packaging are polyurethane adhesives, in addition, special adhesives such as tape are also polyurethane adhesives, which shows that they are widely used 4 Organosilicon sealant: in developed countries, organosilicon sealant is mainly used for building sealing In the next few years, organosilicon sealant will also become the leading type of sealant for building in China 5 High performance epoxy resin adhesive; epoxy resin adhesive for electronic industry and epoxy structural adhesive for construction industry The production technology is difficult and the quality of domestic products is poor At present, it mainly depends on imports It is estimated that in the future, the domestic consumption demand frost in this regard will greatly exceed the average growth rate 6 PVC plastic melt adhesive for automobile; PVC plastic melt adhesive is the main sealant for automobile, accounting for about 1 / 3 of the adhesives for automobile in China, and the annual demand is about 10000 tons at present With the development of automobile industry in China, especially car industry, PVC plastic melt adhesive will have a broad development prospect.