Additive technology is of great significance to the packaging and printing industry
We are a big printing company in Shenzhen China . We offer all book publications, hardcover book printing, papercover book printing, hardcover notebook, sprial book printing, saddle stiching book printing, booklet printing,packaging box, calendars, all kinds of PVC, product brochures, notes, Children's book, stickers, all kinds of special paper color printing products, game cardand so on.
For more information please visit
http://www.joyful-printing.com. ENG only
http://www.joyful-printing.net
http://www.joyful-printing.org
email: info@joyful-printing.net
In the plastics and ink processing manufacturing process, in addition to the matrix resin as the main raw material, it is necessary to add some substances in the resin which have improved properties of plastics and inks or processing characteristics, such materials are additives or additives for plastics and inks. . Additives have both organic and inorganic substances; both single and mixed; both low molecular and high molecular. With the wide application of high-tech processing technology in the plastics, packaging and ink industries, additive technology, as an important part of the technological innovation of the packaging and printing industry, has gradually become the focus of innovation in the industry.
Improve the processing properties and performance of plastics
The additive technology can effectively improve the processing properties of plastics, the mechanical properties of the film (such as shrinkage, rigidity, etc.), electrical properties (such as charge mobility, antistatic properties), optical properties (such as gloss, haze, etc.), weather resistance (anti-oxidation, anti-UV, high and low temperature adaptability) and the use of packaging materials. For example, in the production of film and packaging bags, the surface properties and friction coefficient of the film are an important technical indicator. The coefficient of friction of the film is related to the type, amount, particle size, shape, dispersibility, and degree of treatment of the additive (mainly anti-blocking agent). For example, the commonly used additives for biaxially oriented polyester film are SiO2, TiO2, CaCO3, AL2O3, MgO, and the like. As the amount of addition increases, the surface roughness of the film increases and the coefficient of friction decreases. Reduce the coefficient of friction of the film to a value in the range of 0.3-0.4. In the printing and aluminum plating process, the bonding force between the ink, the aluminum layer and the plastic film can be enhanced. In order to meet the requirements of high-speed automatic filling machine, some bags should have a certain smoothness on the inner surface of the bag. The film is usually smoothed by adding a certain amount of a slip agent such as oleic acid amide to an inner layer material such as polyethylene particles. Since oleic acid amide is poorly compatible with polyethylene, its molecules are easily migrated to the surface of the film to form a weak interfacial layer. If the content of the slip agent is too high, the interface layer will weaken the adhesion between the ink, the adhesive and the surface of the film, and affect the quality of the printing and dry process. We usually require the kinetic coefficient of friction of the inner surface of the polyethylene film to be in the range of 0.2-0.4. When blowing a polyethylene film, adding a very small amount of low molecular weight fluoropolymer can effectively improve the processing and film forming properties of linear low density polyethylene (LLDPE), metallocene catalyzed polyethylene (mPE), and reduce the polyethylene resin. The viscosity at high temperature and high die-cutting state reduces the friction between the melt and the screw, the barrel, and the die (the lip), and particularly improves the surface quality of the film. The antistatic agent can improve the electrical properties of the plastic film, enhance the charge mobility, reduce the surface electrostatic charge, facilitate the high-speed processing of the plastic film during printing and compounding, improve the efficiency of the filling powder product process and the sealing strength of the packaging bag. . In the process of high temperature and rapid die cutting, the additive is easy to generate volatile substances, which causes the packaging material to produce odor. Therefore, it is necessary to select additives according to the requirements of the packaging materials used in the packaged products.
Increase the functionality of plastic material
The addition of a tackifier to the polyethylene resin increases the tackiness of the film surface. A gas phase rust preventive agent is added to the polyethylene resin to form a rust preventive film, which has a gas phase rust preventive function, and has a gas phase rust preventive effect on the packaged metal product. In particular, the addition of degradation promoters, such as biodegradation agents, photodegradation agents, and thermal oxygen degradation agents, to plastic packaging materials can effectively reduce the environmental pollution of plastic waste.
Significance in ink processing and use
Ink as an organic system composed of pigments, additives, binders, fillers and solvents, which are composed of various chemical substances of different kinds and different properties, it is necessary to increase the compatibility between various substances, improve the activity of pigments and fillers, and make ink properties. good. Achieve better printability, such as consistent color, good gloss, good ink film strength, friction resistance, oxidation resistance and so on. Although the amount of the additive added to the ink is small, it has an important influence on the viscosity, drying property, and color of the ink. There are many types of additives used in inks, mainly plasticizers, quick-drying agents, slow-drying agents, and the like. The binder with chemisorption and physical entanglement has a more pronounced effect in the ink. The connecting material is beneficial to the affinity between the pigment, the connecting material and the filler in the printing ink system, improves the adhesion and mechanical strength of the ink, reduces the thickness of the ink film, prevents the floating color and the flowering phenomenon of the printed product, and eliminates the printing process. A quality accident such as a knife wire or a paste plate occurs; the ink storage period is extended. The antistatic agent used in the ink can improve the antistatic performance of the ink, increase the printing speed, and eliminate various types of printing quality problems caused by static electricity. The additives and their contents are selected according to the basic properties of the printed substrate such as electrical properties, printability, and process conditions including differences in ambient temperature and humidity. If the ambient humidity is large, the film is not easy to dry under the condition of high printing speed, and the film tends to stick after printing. Therefore, the quick-drying agent should be added properly, and the content of the oxidation promoter in the ink should be reduced; otherwise, if the environment is relatively dry , a slow drying agent should be added as appropriate.
There is no additive that can satisfy all the conditions of matrix resin, process conditions, material properties, and technical requirements. In actual production, it is often necessary to scientifically select and optimize the configuration of various additives, so that various additives can work synergistically. Processing can get better comprehensive performance.