First, the application of hot melt adhesive packaging in the industry
Wrapping type sealing followed by: carton automatic sealing and packaging of cans / bottle packaging products such as beer, instant noodles, cola, sports drinks, herbal tea, fruits and vegetables, vinegar industry, moisturizing oil, etc., requiring the opening time of hot melt adhesive and equipment sealing Match the speed;
Straw paste: such as milk, tea drinks, herbal tea, Vitasoy and other paper bags are attached to the straw, the main equipment is Tetra Pak, which requires the curing time of the hot melt adhesive to match the speed of the paste tube, and the high and low temperature resistance of the hot melt adhesive The ability matches the product's existing environment;
Paper tray carton then: such as beer, red bull, soy milk, canned beverages, drinking pure water, etc .;
Carton sealing: such as cartons for packaging candy, biscuits, frozen food, ice cream cartons, drawer cartons, Chinese and Western medicines, cigarettes, snack foods, etc., there are many automatic packaging production paper brands, and the requirements for bonding are roughly the same as those of package sealing the same;
PET transparent box packaging; this is mainly used SEC pressure-sensitive hot melt adhesive or PUR hot melt adhesive, which requires water white and odorless, high bonding strength, large cohesive viscosity of the adhesive, and can resist large resilience.
Automatic packaging applications of hot melt adhesives in other industries: such as automatic sealing of household appliances, furniture and furniture, baby carriages, air conditioners, daily detergents, sanitary products, ceramic tiles, building materials, etc.
Second, hot melt adhesives and automated packaging hot melt adhesives
Hot melt adhesive is the abbreviation of hot melt adhesive, is an important category of adhesive industry, with 100% solid content, no solvent, environmental protection, non-toxic, fast curing characteristics, widely used in automated packaging, hygiene products, label tape, medical, Automobile, construction, home appliances, printing and binding, shoemaking, apparel and other industries usually refer to solid state at room temperature. When heated to a certain temperature, they will melt into a viscous liquid. After coating and wetting the adherend After being pressed and cooled to room temperature, the adhesive is completed within a few seconds. Hot-melt adhesives are prepared from EVA, PA, PO, synthetic rubber and other main resins with tackifying resins, thinners, antioxidants and other raw materials, according to a certain production process, heated and melted, fully stirred and evenly prepared.
Hot-melt adhesives come in various shapes, such as rods, granules, flakes, columns, powders, films, nets, spheres, pillows, etc., and red, yellow, white, black, blue and purple powders. There are pressure-sensitive hot-melt adhesives and non-pressure-sensitive hot-melt adhesives; there are plastic hot-melt adhesives and reactive and non-plastic hot-melt adhesives. The main material of hot melt adhesive can be divided into EVA hot melt adhesive, PA hot melt adhesive, PE polyester hot melt adhesive, PO hot melt adhesive, SEC hot melt pressure sensitive adhesive, TPU hot melt adhesive, PUR heat Melt adhesives, hot melt adhesives with different body materials have their own characteristics, and have their own advantages and disadvantages. For example, the most widely used EVA hot melt adhesive has obvious limitations in high temperature resistance. Another example is PUR hot melt adhesive with the strongest adhesion, but It is not a thermoplastic material, which cannot be used repeatedly, and the cost is high, which requires high-cost glue equipment.
Automated packaging hot melt adhesive refers to the hot melt adhesive that should be used in automated packaging, usually EVA type hot melt adhesive or polyolefin type hot melt adhesive or SBC hot melt pressure sensitive adhesive. The side and seal of the bonded carton are hot The melt adhesive has fast curing, strong initial adhesion, low melt viscosity, easy to flow, and has certain low temperature resistance and high temperature resistance.
3. Analysis of the bonding base material of the automatic packaging box
Common bonding substrate conditions:
A, membrane + membrane B, membrane + paper C, paper + paper. There are many types of films, and paper types are also very different. They have a great influence on the bonding effect. Automated packaging box, the input is flat cardboard, the output of the complete packaging box, there are packaging items. The characteristics of the base material have a great influence on the bonding effect. It is organized as follows. The heavier items require higher bonding strength:
Polarity: Polarity attracts each other. Those with similar polarity to the base material have good bonding effect, otherwise the bonding effect is poor.
Density: Loose substrates are easy to penetrate, requiring a shorter holding time and high pressure; otherwise, dense substrates.
Surface tension: Insufficient surface tension will affect wetting and bonding. Corona treatment and polishing help to improve the bonding effect.
Ink: The polarity, density and adhesion of ink will affect the bonding effect of hot melt adhesive.
Surface temperature: If the surface temperature of the substrate is too low, it will affect the wetting, opening time and penetration of the adhesive; if it is too high, the curing time will be extended.
Moisture, surface treatment agent (such as talc, wax), and pollution: seriously affect the bonding strength, moisture makes penetration difficult, surface treatment agent may react with hot melt adhesive, affect the durability of bonding, and pollution directly Affect the bonding effect.
Adsorption and mobility: mainly fillers and additives in the substrate, which seriously affect the aging and adhesion of hot melt adhesives.
Fourth, equipment and technology
Turn-on speed: High-speed production lines often reduce the requirements for opening time, but increase the requirements for curing speed.
Use temperature: Increasing the temperature of the glue will extend the opening time and slow down the curing speed. vice versa. The temperature of the substrate and the ambient temperature have a great influence on the bonding strength. The temperature of the substrate is low, it is easy to absorb the energy of the hot melt adhesive, reduce the temperature of the adhesive, increase the viscosity of the adhesive, and weaken the permeability, and vice versa.
Opening time: the opening time of the equipment = opening distance / production line speed, it should be shorter than the opening time of the hot melt adhesive.
Pressure: Sufficient pressure helps the penetration, wetting and curing of the hot melt adhesive.
Holding time: The holding time of the equipment should be designed to be longer than the curing time of the hot melt adhesive, and the bonding pressure should be removed after the hot melt adhesive is fully cured.
The amount of glue used: increasing the amount of glue can improve the infiltration and penetration of the glue and improve the bonding effect and adhesion, extend the opening time, slow down the curing speed, the amount of glue required is moderate, he is the guarantee of the bonding effect, pursuit It is also not possible to reduce the amount of glue used without limit to reduce costs.
Glue mode: Under the same amount of glue, the spray mode with large surface area has short opening time and fast curing speed.
Fifth, the main application industry of automatic packaging hot melt adhesive
Wrapping type sealing followed by: carton automatic sealing and packaging of cans / bottle packaging products such as beer, instant noodles, cola, sports drinks, herbal tea, fruits and vegetables, vinegar industry, moisturizing oil, etc., requiring the opening time of hot melt adhesive and equipment sealing Match the speed;
Straw paste: such as milk, tea drinks, herbal tea, Vitasoy and other paper bags are attached to the straw, the main equipment is Tetra Pak, which requires the curing time of the hot melt adhesive to match the speed of the paste tube, and the high and low temperature resistance of the hot melt adhesive The ability matches the product's existing environment;
Paper tray carton then: such as beer, red bull, soy milk, canned beverages, drinking pure water, etc .;
Carton sealing: such as cartons for packaging candy, biscuits, frozen food, ice cream cartons, drawer cartons, Chinese and Western medicines, cigarettes, snack foods, etc., there are many automatic packaging production paper brands, and the requirements for bonding are roughly the same as those of package sealing the same;
PET transparent box packaging; this is mainly used SEC pressure-sensitive hot melt adhesive or PUR hot melt adhesive, which requires water white and odorless, high bonding strength, large cohesive viscosity of the adhesive, and can resist large resilience.
Automatic packaging applications of hot melt adhesives in other industries: such as automatic sealing of household appliances, furniture and furniture, baby carriages, air conditioners, daily detergents, sanitary products, ceramic tiles, building materials, etc.
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