With the development of social economy, the flexible packaging industry has developed rapidly. The improvement of living standards also prompts people to pay special attention to issues related to their own health. Therefore, the requirements for the safety and hygiene of food and packaging are also increasingly strict. Most of plastic packaging materials are used for food packaging, so the health, safety and environmental protection issues of plastic packaging are closely related to the health of consumers. At present, the food packaging composite film produced in China is basically compounded with a solvent-based adhesive, so that there is solvent volatilization and a small amount of solvent residue in the compounding process. Food packages containing residual solvents can cause odors in the package and degrade the food. Solvent evaporation during the compounding process not only pollutes the environment, but also jeopardizes the physical health of field operators. Therefore, the solvent volatilization amount and solvent residue in the food packaging compounding process are reduced, and the quality of the product can be guaranteed, the cost can be reduced, and the enterprise benefit can be improved. A food hygiene and sanitation conforming to the food packaging can be sought, and the company can adapt itself to the development path and become a domestic food product. Packaging companies to explore common goals.
Shanghai Longhong Chemical Technology Co., Ltd. has been committed to the social and environmental responsibility and confidence in its own strong technology, and has vigorously developed a two-component water-based adhesive, and successfully introduced two-component waterborne adhesives into the flexible packaging market, to China's flexible packaging industry. Bring a revolution in environmental protection and cost.
Two-component water-based adhesive is commonly known as water glue. It is a water-based polymer emulsion. It discharges 100% of water vapor instead of harmful solvents during the production of composite packaging. The finished packaging product eliminates the residual solvent. No odor will be produced. For flexible packaging manufacturers, the biggest advantage of this two-component waterborne adhesive is that it can be applied to existing dry process compounding lines, without the need for equipment modification, and it can be directly used without adding new investment. The combined cost of two-component waterborne adhesives is also lower than that of existing domestic solvent-based adhesives. There is no need to worry about the hygienic performance when using two-component water-based adhesives, which fully comply with the FDA standards.
Two-component waterborne adhesive features :
one. It is only necessary to mix the main agent and curing agent when gluing, the operation process is simple and the cost is low.
two. It is a composite finished product suitable for food, medicine, and cosmetic products.
three. The short maturation time of the finished product, and the fact that it can be cut and bagged after 12 hours of ripening, this feature is particularly suitable for the current needs of food manufacturers to shorten the delivery cycle.
four. Is more prominent in the packaging machine 'target = _blank> transparent film composite properties, transparency and peel strength are very high.
Fives. It is a composite aluminum-plated structure product that not only has good composite strength, but also has no aluminum-plating transfer phenomenon.
six. The versatility is good, composite different product structure can be compounded without cleaning the anilox roller, and the production efficiency is high.
Two-component waterborne adhesive composite application process requirements :
1. The dyne of the substrate needs to be greater than 38 dyne/cm.
2. Select the 170-200 line anilox roller.
3. Solid content: 42%.
4. Compound speed: 70-140m/min.
5. Oven temperature: 60 to 70, 70 to 80, 80 to 90.
6. Composite roll temperature: 60Â°Cï½ž70Â°C
7. Composite roller pressure: 4 kg
Two-component waterborne adhesive compounding:
1. Since the sizing amount of the two-component water-based adhesive is very small, an anilox roller with a dense and shallow network mesh and a relatively large mesh opening is required, so that the water-based adhesive can be better transferred to the film.
2. Before using the two-component water-based adhesive, it is necessary to slowly stir in the tub for 5 to 10 minutes to ensure that the various additives in the two-component aqueous binder mix well.
3. Use a counter-rotating roller as much as possible.
4. When the temperature of the oven reaches the set temperature after compounding, the air inlet of the oven is maximum to ensure the drying of the adhesive coating.
5. To prevent jamming, try to loosen the scraper when it is shut down and allow the anilox roll to soak in the aqueous adhesive to keep it rotating.
6. In order to prevent air bubbles from being generated too high, an ink stick can be placed in the tank.
Composite product properties :
Physical property test table
Heat seal strength
The amount of glue (dry basis)
It can be seen that when the same product is used to produce the same product, the physical properties of the product using water-based glue can reach the level of solvent-based adhesive compounding, but the amount of glue applied is much smaller than that of solvent-based glue compounding. In addition, after the application of the two-component waterborne adhesive compounding technology, the residual solvent in the compounding process is not only not increased, but also the original solvent of the printing film can be volatilized, and the product can meet the requirements of the national and industrial food packaging solvent residue after the product is released. Food packaging hygiene, safety, and environmental protection.
Economic benefits :
According to statistics, the use of two-component water-based adhesives can save the company about 10-15% of the cost of use.