Modern plastic processing is developing towards automation, high speed and high quality. The faster the processing speed is, the easier it is to produce static electricity due to friction, and the easier adhesion between films (plastic products) is, which seriously hinders the high-speed extrusion of high-speed wire; the better the transparency of the film, the higher the processing temperature, the easier the agglomeration and adhesion; in addition, the wide application of filling materials such as calcium carbonate, talcum powder and diatomite has brought new problems to the plastic processing and product quality, affecting its quality The smoothness and luster of the product surface. Therefore, the smooth agent plays an important role in plastic production and automatic packaging.
At present, there are amide (oleic acid amide and erucic acid amide), soap (calcium stearate, etc.) and silicone (silicone). The latter is liquid, inconvenient to add and use, and expensive, there is no professional manufacturer in China, so it is difficult to popularize and apply. Although the soap products are cheap, but the effect is not ideal, and the amount of soap is large, it can not be used in the middle and high-grade products. Oleic acid amide and erucic acid amide are two kinds of smooth agents with moderate price, obvious effect, little dosage (0.05% - 0.3%), non-toxic (FDA approved), wide range of use, and wide application prospects.
Adding 0.05% ～ 0.3% oleic amide in low density polyethylene (LDPE) resin can significantly reduce the static and dynamic friction coefficient of the resin, improve the processability of the resin and the opening of the film, effectively prevent the adhesion between the films, increase the handle of the film or molded products, and improve the surface smoothness of the products.
When oleic amide (0.05%) is added to polyolefin cable material and all plastic communication cable material, the friction coefficient can be reduced from 0.70 to 0.16. Meanwhile, the colorability and dispersion of carbon black can be changed to realize high-speed extrusion of cable pellets and improve the smoothness of inner wall of cable sheath.
In order to make the friction coefficient of composite film (such as transparent PP composite film and PP pearlescent film) lower than 0.4, it is necessary to add a smoothing agent (oleic acid amide or erucic acid amide), and generally a core layer (intermediate layer) should be added to make it migrate to the surface. As a new packaging material, BOPP has been widely used in tobacco industry. In order to meet the requirements of cigarette packaging machine with speed up to 500-800 packages per minute, the friction coefficient must be ≤ 0.2. Only by adding erucic acid amide (about 0.12%), can the static and dynamic friction coefficient be so low. The requirement of PP blown film for smoothness is very high. Therefore, the selection of smooth agent is very important. In the actual production process, the mixture of erucic acid amide and oleic acid amide can achieve ideal effect.
Milk, soybean milk, soy sauce, beverage and other liquid substances packed by automatic filling machine require that the packaging film is easy to open and the dynamic friction coefficient is less than 0.35. Only oleic amide or erucic acid amide can meet the requirements. Adding 0.02% - 0.1% oleic amide to foamed polyethylene (fruit net cover) can make its static friction coefficient ≤ 0.30 and increase its luster obviously. The requirements of transparency, strength, elasticity and surface smoothness of disposable medical syringes are particularly high, so it is necessary to add a smooth agent to the materials.
Adding oleic amide or erucic acid amide to plastic ink (surface printing ink) can improve the smoothness and smoothness of the ink surface, as well as improve the adhesion, stickiness, scratch resistance and penetration resistance of the ink on the surface of printing crystal, so that the imprint is clear and the color is bright.
At present, the plastic packaging materials have exceeded 30% of the total consumption of plastics in China. The static and dynamic friction factors (i.e. smoothness and opening) of the surface of the packaging materials are the most important technical quality indicators to adapt to various mechanized and automatic packaging processes, and also the most critical quality characteristics affecting the efficiency of packaging operations. Generally, it is required to be controlled within 0.35, and only by adding the lubricant can we make the The friction coefficient of plastic packaging products can meet this requirement and prevent the film from self-adhesive or bonding with the package. In view of the rapid growth of packaging and printing plastics, the market demand for high-efficiency lubricants will also increase rapidly.
Dongguan Beite packaging materials Co., Ltd. - located in Dongguan City, the world's manufacturing city, is a subsidiary of Beite packaging (China) Co., Ltd., with a plant area of 6000 square meters. It is a flexible packaging enterprise integrating R & D, production and sales. It has a complete set of domestic advanced production equipment, a scientific and humanized management system and a group of experienced technical personnel For backing, to provide customers with quality products and first-class service.
The company produces composite bags, roll film, fruit bags, aluminum foil bags, suction mouth bags, self-supporting bags, zipper bags, anti-static bags, special-shaped bags, etc., which are suitable for the internal and external packaging of food, daily chemicals, electronics, toys, medicine, cosmetics, industrial products and other industries.
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