Discussion on some technologies of decoration and

2022-08-17
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Discussion on some technologies of paperboard decoration and deep processing

paperboard is the main raw material for the production of corrugated boxes, cartons and other products. Its performance directly or indirectly affects the internal quality and use effect of products

for corrugated boxes, cartons and other packaging products. 3. For sample size products, it has wear-resistant, waterproof and moisture-proof properties, as well as high strength and good air tightness, which are the basic quality requirements for the use characteristics of paperboard. However, ordinary paperboard produced by paper mills often does not have good wear resistance, water resistance and moisture resistance. The strength and air tightness of paperboard vary with the quality grade of paperboard. Therefore, in order to improve the performance of corrugated boxes and cartons, we must carry out some necessary technological processing on the surface of the paperboard in order to fundamentally improve the performance and appearance quality of the paperboard

I. polishing process of paperboard surface

polishing is a common process for post press processing of packaging products. After the surface of the product is polished and coated, it can enhance the performance of water resistance, sun resistance, friction resistance and pollution resistance of the printed product, and at the same time, it can also improve the surface brightness of the product, so as to greatly improve the grade of the product. There are many structures of glazing paint, including oily glazing oil for printing machine, water-based and oil-based glazing oil for glazing machine, solvent based glazing paint and UV glazing paint. The characteristics of glazing coatings are different, and the process effect of product surface processing is also different. Similarly, the gloss effect and wear resistance of bright coatings are also different due to different material properties and formulas. Coated with matte paint, the surface of the print has almost no gloss, but it has a certain sense of art. Some products are coated with matte paint, and the process effect is no less than that of bright paint. Whether it is bright or matte coating, the coating must have good wear resistance in order to protect the surface of prints

process characteristics of oily glazing. Because the thickness and drying of the polishing coating are limited by the machine structure, the gloss and wear resistance of the printing surface are not as good as that of the solvent or water-based polishing oil on the polishing machine. Therefore, this kind of glazing is generally only suitable for ordinary products with small batch and low quality requirements

process characteristics of solvent glazing. The products polished with solvent have high surface gloss and wear resistance, but the diluent is organic solvent

such as toluene, with the volatilization of solvent, the cost of glazing paint is also large. Solvent glazing coating has poor physical and chemical resistance, the coating is easy to yellowing, and the solvent with strong odor is not only easy to pollute the environment, but also has a certain impact on production safety. Therefore, the production and operation site must pay attention to the emission of exhaust gas. If the machine adopts electric heating pipe for drying, it is necessary to pay attention to maintaining the smooth transportation of paperboard, so as to prevent the deflection of paperboard transportation and blocking the drying channel, so as to touch the electric heating pipe, causing fire safety accidents

process characteristics of water-based glazing. The waterborne glazing coating has the advantages of colorless, tasteless, non-toxic, non irritating, fast drying speed, wear resistance, high temperature resistance, no yellowing, no discoloration, and high transparency and gloss. Therefore, this process is more suitable for the surface finishing processing of food packaging. However, the solvent of water-based glazing oil is water, which is easy to produce deformation after printing. Its wear resistance is second only to solvent glazing paint. If the outer layer of paperboard is packed with PVC plastic film, it is easy to damage the glazing film and graphic ink color of prints due to the sticky surface of PVC plastic film. Therefore, the outer packaging material is PVC plastic film, and the water-based paint should not be used for paperboard glazing, but solvent based wear-resistant glazing paint should be used for glazing

uv glazing process characteristics. UV glazing is the use of UV glazing oil coated on the surface of prints, so that the surface forms a high gloss film. After UV irradiation, photopolymerization reaction and photocrosslinking reaction will take place inside the coating, and then it will be cured and dried quickly, so there will be no adhesion quality failure, which is conducive to ensuring the rapid operation of the next process. UV glazing coating has the advantages of wear resistance, drug resistance, chemical resistance and good stability. Because UV glazing oil does not have the problem of solvent volatilization, it is not like the pollution of solvent based glazing process to the environment, and its dosage is relatively small, and its production cost is far lower than that of film coating process. Therefore, it is an ideal process to replace plastic coating and solvent based glazing. However, during production, it should be noted that UV coating will stimulate human skin to a certain extent, and direct UV light will also cause certain damage to human body. After UV irradiation and drying, the coating will produce ozone. The production site should have good ventilation and exhaust

II. Requirements of paper packaging products for glazing paint

in terms of the use and processing characteristics of the product, the glazing paint must meet the basic requirements of safety, health and environmental protection. Therefore, the glazing oil has good flexibility, leveling, wear resistance, acid and alkaline resistance and adaptability, and the glazing oil should have high transparency and non discoloration performance. Its surface facial mask layer should have good toughness, so as to better protect the surface of the print, Enhance the waterproof, moisture-proof, dirt proof and wear-resistant properties of product packaging

calendering process of paperboard surface calendering is a deep processing process based on glazing. The production process is roughly as follows: first polish the coating with a polishing machine, and then heat press it with a calender after the Polish film is dry, so that the Polish film can form a more smooth and high brightness mirror effect, which is a quality effect that cannot be achieved by the general polishing process. Therefore, this production process is more used for the surface finishing processing of pre printed corrugated boxes, cartons and other packaging products. Traditional calendering coatings use organic solvents such as toluene and cyclohexanone as diluents. It is not only easy to pollute the environment and endanger human health, but also easy to pollute the products, leaving hidden dangers to the packaging of products. Therefore, it is not suitable for the packaging of food and medicine. From the perspective of packaging safety, non-toxic, tasteless and pollution-free environment-friendly water-based calendering oil should be used

the waxing process of paperboard surface the waxing process treatment of paperboard surface is relatively simple in production process and equipment, and the operation is also very easy to master. This process is to use a waxing machine to evenly coat the heated and melted paraffin liquid on the surface of paperboard or printed matter. When the paraffin coating on the paper is cooled, it solidifies to form a thin, very smooth wax film, so that the paper surface has better waterproof, moisture-proof, mold proof It is dirt proof, rust proof, oil resistant and wear-resistant. Therefore, this process is widely used in the surface processing of food packaging, paper packaging and other non moisture resistant products

the spraying process of the paperboard surface uses the film coating machine to spray a layer of polyethylene or polypropylene with a thickness of 0.01mm ~ 0.07mm on the paperboard surface, so that the air tightness and tensile strength of the paperboard can be better improved, and at the same time, the moisture-proof, water-proof, oil-proof and dirt proof properties of the paperboard can be greatly improved. In recent years, with the continuous prosperity of the market economy, liquid drinks, solid frozen food and other products have an increasing demand for coated paperboard, and the coating technology is also becoming more and more mature. According to the use characteristics of the product, the coating processing of paperboard can be either single-sided or double-sided. The printing quality control of double-sided coated paperboard is 4 points important. If the process control is improper, it is easy to have the quality problem of over bottom imprinting. in other words. Printing ink is printed on PE film without absorptive property, which is easy to stick to the back of the print. Therefore, when printing double-sided coated paperboard with a lithographic press without a drying device, wear-resistant, strong adhesion and non absorbent ink should be selected for printing to ensure the printing quality of products

lamination process on the surface of paperboard lamination is a commonly used finishing process for preprinted paperboard, cartons, handbags, covers and other products. After coating, printed products can achieve waterproof, antifouling, anti fading, heat resistance, light resistance, friction resistance and other properties. At the same time, it can enhance the gloss, aesthetic feeling, puncture strength and tensile strength of products, and improve the service life and packaging quality of products. The general process of film covering is: after the product is printed, the plastic film and the printing friction surface should be absolutely clean with the film covering machine, and the surface of the product should be compounded into an integral structure to form a printed matter with paper and plastic in one. The film covering process can be divided into instant coating and pre coating; There are also process differences between hot cladding and cold cladding. There are also different kinds of adhesives for film covering, including water-based film covering adhesive and solvent film covering adhesive. Solvent coated adhesive has high brightness, but it has the problem of environmental pollution. While water, the solvent of solvent coated adhesive is water, which has little pollution to products and the environment. Therefore, it is widely used in the surface finishing processing of food packaging. As the recycling of film covered products requires classification and processing, the regeneration process is complex and the production cost is high, some packaging products are being replaced by calendering or UV glazing processes

III. production process of functional corrugated paperboard

functional corrugated paperboard is a new type of packaging material. It is different from ordinary corrugated paperboard in that the processing of base paper or cartons through special technology and process expands the use function of cartons, and also improves and improves the quality of cartons. It increases the added value of products and meets the personalized needs of product packaging

from the perspective of logistics characteristics, commodity characteristics and market requirements, functional corrugated board is an important production technology to improve commodity packaging quality and effectively protect commodities

production process of waterproof corrugated paperboard the main performance of waterproof corrugated paperboard is that the surface of the paperboard is impervious, but it cannot be soaked in water, otherwise it will be permeable and broken from the inner layer. Its main processing process is: the curtain coating method is to use the melted synthetic resin or paraffin mixture to flow down from the hopper 13 into a film, and apply it on the horizontally running corrugated paperboard. When the surface of the paperboard is coated with a layer of resin film or wax film. That is, it has good water resistance and wear resistance. This kind of corrugated board is mainly used for packaging pickled products, fruit and vegetable products and refrigerated food. Because the corrugated board has a soft paraffin layer on the surface, so. It is also suitable for packaging furniture with high finish, high-end goods or industrial instruments with a long interval between two starts, which are easy to scratch

production process of hydrophobic corrugated board hydrophobic corrugated board is also called water repellent corrugated board. This kind of corrugated board has high water repellency. When it contacts wet objects or is drenched or splashed, the waterproof cardboard surface has certain water repellency, so that water droplets will not penetrate into the cardboard fibers. Its processing technology is: first, the paperboard is coated, such as coating light oil, paraffin, silicone and other hydrophobic substances

before applying varnish, it is best to apply a starch film layer on the surface of paperboard first, and then apply varnish after it is dried and formed a film. Silicone not only has good water repellency, but also has flame retardancy, corrosion resistance, temperature resistance and other properties. Paraffin coating has high smoothness, good wear resistance and water repellency. If an appropriate amount of water-resistant additives, such as polyvinyl butyral and melamine formaldehyde resin, are added to the hydrophobic coating, the water resistance of the coating can be improved, and the water repellency of the corrugated board surface can be better improved.

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