The advantages of composite flexible packaging have been discovered more and the scope of its application has continued to expand. In addition to food, it has been widely used in pharmaceuticals, cosmetics, daily necessities, chemicals, weapons, coatings, precision instruments, meters, and grand equipment. At the same time, with the different contents of the packaging, the requirements for packaging materials are becoming increasingly diverse. For example, the materials are required to be breathable, soft, rigid, lubricious, flame retardant, antistatic, impact resistant, and conductive. , insulation, anti-bacterial, anti-aging, radiation protection, and easy degradation, which means that the material is functional. The solution is mostly to add functional additives in the film manufacturing process to obtain functional films, and to combine various functional films to obtain multifunctional packaging materials.
The advantages of composite flexible packaging have brought new problems. For example, the most common detergent bag manufacturing, because the detergent powder is a fine powder, which requires the packaging material, especially the inner layer material surface resistance is small, smooth and good, in the packaging powder does not fly, there is Good for high speed packaging. For a period of time, the dynamic and static friction coefficient of the inner bag should be less than 0.3, and the surface resistivity should be less than 1013 Ω. However, the ordinary LDPE friction coefficient should be 0.6-0.8 and the surface resistivity should be greater than 1014 Ω. The usual method is to use a slip agent (or opening agent) and resistance. The particles are blown by the functional particles of the electrostatic agent. Among these particles, the smoothing agent content is 400 to 600 ppm (mg/kg), the high value is 1000 ppm or more, and the antistatic agent is 0.1 to 1%. The slip agent is usually oleic acid amide or erucic acid amine amide, and the antistatic agent is generally a fatty acid polyol ester. They are only a kind of mechanical mixing with the macromolecules of PE, and they are not well compatible. The molecular heat movement makes them gradually The interface of low free energy migration appears "frost" phenomenon. The higher temperature accelerates the thermal movement of the son, thus accelerating the phenomenon of migrating and frosting. These aid molecules that accumulate at the interface are related to the surface energy of general adhesive molecules. The forces between the molecules are so small that they form a weak interface layer like release paper, which greatly destroys the adhesive force between the adhesive and the PE. In this way, when the composite film is manufactured, the strength of the machine is found to be very good. After a certain period of time or after aging, the peel strength is decreased. After peeling, the PE inner layer (to the adhesive surface) is whitened, and sometimes it can be wiped off by hand. In fact, this is migration. Other additives such as slip agent.
Similar examples include the PET/LLDPE structure. After the compounding, the strength at the ink is found. The strength at the blank is rather low. This is because the smoothing agent, antistatic agent, or low molecular weight PET in the PET film migrates to the interface. To reduce the adhesive force, the place where the ink is present is because the ink has stronger compatibility with these migration substances than the adhesive, so that it can play the role of the coating agent or the anchorage.
In short, in order to obtain a functional film, we add various additives during the film manufacturing process, but the compound migration phenomenon appears in the compound and even offsets the negative impact on the functionality. So how to solve this contradiction?
The Komori company's solution to these problems can be solved by reducing the amount of additives, but the function of the material is lost.
Or through the improvement of functional films, such as finding more efficient additives, or adding other additives such as coupling agents to reduce the migration of additives, or the particles themselves are functional polymers, but this will inevitably increase the cost of the film.
Adhering to "accommodating diversified needs and providing professional services," Gaomeng who "provides customers with a complete set of flexible packaging solutions" has devoted great efforts to the research and development of Gaomeng's solution - YH2600/YH25 new high-auxiliary-content films. Composite adhesive.
The advantages of composite flexible packaging have brought new problems. For example, the most common detergent bag manufacturing, because the detergent powder is a fine powder, which requires the packaging material, especially the inner layer material surface resistance is small, smooth and good, in the packaging powder does not fly, there is Good for high speed packaging. For a period of time, the dynamic and static friction coefficient of the inner bag should be less than 0.3, and the surface resistivity should be less than 1013 Ω. However, the ordinary LDPE friction coefficient should be 0.6-0.8 and the surface resistivity should be greater than 1014 Ω. The usual method is to use a slip agent (or opening agent) and resistance. The particles are blown by the functional particles of the electrostatic agent. Among these particles, the smoothing agent content is 400 to 600 ppm (mg/kg), the high value is 1000 ppm or more, and the antistatic agent is 0.1 to 1%. The slip agent is usually oleic acid amide or erucic acid amine amide, and the antistatic agent is generally a fatty acid polyol ester. They are only a kind of mechanical mixing with the macromolecules of PE, and they are not well compatible. The molecular heat movement makes them gradually The interface of low free energy migration appears "frost" phenomenon. The higher temperature accelerates the thermal movement of the son, thus accelerating the phenomenon of migrating and frosting. These aid molecules that accumulate at the interface are related to the surface energy of general adhesive molecules. The forces between the molecules are so small that they form a weak interface layer like release paper, which greatly destroys the adhesive force between the adhesive and the PE. In this way, when the composite film is manufactured, the strength of the machine is found to be very good. After a certain period of time or after aging, the peel strength is decreased. After peeling, the PE inner layer (to the adhesive surface) is whitened, and sometimes it can be wiped off by hand. In fact, this is migration. Other additives such as slip agent.
Similar examples include the PET/LLDPE structure. After the compounding, the strength at the ink is found. The strength at the blank is rather low. This is because the smoothing agent, antistatic agent, or low molecular weight PET in the PET film migrates to the interface. To reduce the adhesive force, the place where the ink is present is because the ink has stronger compatibility with these migration substances than the adhesive, so that it can play the role of the coating agent or the anchorage.
In short, in order to obtain a functional film, we add various additives during the film manufacturing process, but the compound migration phenomenon appears in the compound and even offsets the negative impact on the functionality. So how to solve this contradiction?
The Komori company's solution to these problems can be solved by reducing the amount of additives, but the function of the material is lost.
Or through the improvement of functional films, such as finding more efficient additives, or adding other additives such as coupling agents to reduce the migration of additives, or the particles themselves are functional polymers, but this will inevitably increase the cost of the film.
Adhering to "accommodating diversified needs and providing professional services," Gaomeng who "provides customers with a complete set of flexible packaging solutions" has devoted great efforts to the research and development of Gaomeng's solution - YH2600/YH25 new high-auxiliary-content films. Composite adhesive.
Geneva Watch Series Co., Ltd. , http://www.nsdigitalwatch.com