Nowadays, corrugated cartons are no longer just simple, rough-printed outer packaging boxes. The user's request for improvement is not only the improvement of its own strength requirements, but also its printing graphics, colors, gloss, wear resistance, anti-slip, Size and other aspects. In the past, traditional packing boxes were sheet-fed offset and then tacked. Although offset printing can achieve standard effects on printing, such production methods have complicated processes, many processes, low efficiency, and poor environmental safety. The flexographic post-printing process uses a flexible photosensitive resin plate to print on corrugated cardboard with rough surface and poor pressure. It is difficult to avoid large dot-spreading, and the dot-gradation level is not sufficiently expressed, and there are pit patterns, overprinting errors, and luster. Problems such as poor grades, so the printing is limited to the low cable level.
In the past two years, the corrugated paperboard has been greatly improved in all aspects of technical printing, driven by the low production costs of direct corrugated board printing, simplified processes, high efficiency, and safety and environmental protection. With the continuous upgrading of wide-format flexographic printing presses, several domestic flexographic printing machine manufacturers have actively developed and launched high-precision, high-line flexographic printing presses. In addition, along with it, digital plates and high-grade inks are widely used in corrugated board printing.
A flexo printer equipped with a high-line anilox roller can print a printed product with a low dot expansion rate and a high network cable. However, the higher the anilox roller is, the smaller the ink-carrying capacity of the anilox roller is because the uncoated paper can absorb the ink. Anilox rollers with low ink loading on higher screens cannot print solid colors on liner paper or white card paper. In this case, using coated paper for printing is an ideal choice. Printing on coated paper can result in a higher coloring, ie, a fuller, brighter color, compared to uncoated white or white kraft paper. In addition, the dot image is clearer, and it also has a very good gloss. The overall printing effect is bright, which is beyond the scope of ordinary white cattle cardboard or liner paper, and the use of coated paper in the outer packaging carton printing is more attractive to the eye. However, it is difficult to perform flexographic printing on coated paper directly, mainly because the coating on the surface of the paper fills the fiber-connected pores on the surface of the cardboard. After the ink is printed on the surface of the coating, the coated paper is coated. The coating on the surface prevents the paper from absorbing and penetrating the ink. The ink can only stick on the surface of the coating, causing the ink to drier during the printing process. If the ink cannot be dried in time, it is easy to produce prints, decolorize and rewetting under wet conditions, as well as problems such as difficulty in overprinting between colors and slow production speed. During printing, problems such as dragging, discoloration, and overprinting can be technically overcome by improving the performance of the ink. The speed of production is directly related to the drying speed of the ink. The ink drying speed is also related to the ink absorption of the paper itself. If the ink can quickly dry on the coating, naturally, problems such as dragging, decoloring, overprinting, and slow production are no longer a problem. Therefore, the core problem of post-flex printing on coated paper is the slow drying of ink. The drying time of an ordinary non-coated white bullnose or liner paper ink is about 3 seconds, and the ink drying time of a gray-white paperboard is about 20 seconds. As for the problem of slow drying of ink on coated paper, there is a new type of light-coated white ox cardboard for flexo printing. It absorbs ink quickly, and the drying time of ink is about 5 seconds. The speed of printing can be greatly improved, and other problems can be easily solved. Of course, it would be better if the press was equipped with drying equipment.
In recent years, in order to enable printing and packaging companies to easily overcome the difficulties in printing production, a light-coated white bull card between white and heavy coated paper came out. The light-coated white cow cardboard is coated with a very thin coating layer on the basis of the white cow cardboard, and the air knife coating method can be used to coat the surface of the paper smoothly. It has the printing advantages of coated paper, but also has the characteristics of easy printing of white cows. Because the light-coated coating is very thin, the thin coating does not easily crack and dust. The coating can remain very even. The high quality coatings based on china clay can make the ink better absorbed on paper. Such paper printing ink can be quickly dried in a short time, the ink drying quickly can improve the printing production efficiency, and even can directly print the press line slot, on some ink printing machines with drying device can be connected line folding or die cutting produce.
Due to the unique printing effect of coated paper itself, as the demand for the quality and quantity of packaging containers exquisite in the packaging market is increasing, the demand for coated paper for flexo printing is increasing year by year, and many brands of packaging Users are also happy to use coated paper as a packaging material for their products. One development approach is to upgrade the original rough packaging to high-end printing; another development approach is to reduce production costs, from the original offset printing to flexo printing. Therefore, at present, there are many carton plants that use some gray-white board paper for flexo printing. In fact, gray-white board is a kind of paper suitable for offset printing. If it is used after being printed on flexo, it will usually encounter some more troublesome problems. For example, the gray-white paper coating is usually very thick. During the production process, when passing through the hot plate of the paperboard production line, the surface coating is easily worn and scratched, causing defects in the subsequent printing. The thicker the coating, the slower the ink dries and the more difficult it is to print. And the coating thickness is easy to remove powder. The gray-white paper itself is a kind of recycled waste paper, and the physical properties of the recycled waste paper are lower than those of the original paper. At present, the domestic paper mills are generally restricted by the raw materials and technologies. Under the influence of the conditions such as the tensile strength, folding resistance, smoothness of the paper surface, and uneven coating stability, the coated white board is usually used. Only 250 grams or more of high-gram weight paper is produced. The higher the paper weight, the higher the paper cost. The use of low-weight paper is one of the most effective ways to reduce the cost of raw material production and to reduce waste production.
The performance of the paper depends mainly on its own fiber structure and surface treatment. The fiber structure of the paper is composed of primary fibers, waste paper fibers, and the raw fibers are fresh pure wood pulp fibers. The physical properties of the paper produced by the paper are strong and the fiber is hygienic. Clean, completely free of impurities sand. Jianmei Light-coated White Cattle Cardboard is a 100% pine fiber raw material that can be safely and directly used in food packaging. However, the harmful chemical substances such as dioxin, chlorine, bacteria, and heavy metals contained in recycled waste paper fibers are usually several times higher than the original paper, and are not hygienic and are not suitable for direct use in food packaging. In addition. The physical properties are certainly inferior to the same weight of the original paper. In addition, the waste paper contained in recycled waste paper contains more sand and gravel. It is easy to damage the production equipment, especially the anilox roller with squeegee device in the flexographic printing machine, because the sand in the recycling waste paper may fall to the surface of the anilox roller with high speed operation and the static condition. The friction between the doctor blades rubs, and the surface of the anilox roller is easily scratched, and then there is a printing defect that is difficult to make up. The use of clean original paper rarely happens.
Whether paper fibers use waste paper fibers or native fibers are recyclable materials, most people think that the use of recycled waste paper fibers can reduce the damage to forest resources, which is a way to protect the environment. This approach is to recycle used packaging boxes to paper mills, causing the paper to be processed into packaged packaging products to the end user and recycled to the paper mills, but this is a material recycling process. This waste paper recycling should not exceed 5 times. After 5 times, the recovered paper fiber becomes short and fragile and cannot be reused. This process cycle can be very short, from a few months to several years. However, in this recycling process, the paper mills have to produce large amounts of sewage and carbon dioxide, but also reduce the oxygen in the atmosphere. Another kind of planned and rational development and use of forest resources can really play a role in environmental protection. This approach is to plant trees. After growing, they are felled and sent to paper mills for processing into paper, and then several times more trees are planted. The practice of replanting five trees for each felling tree is a cycle of natural renewable resources. During the growth process, pieces of trees absorb the harmful carbon dioxide in the atmosphere through the photosynthesis of plants and create more beneficial oxygen. In addition, forests also play a role in protecting soil and water. Forests are a source of clean water for nature. Although this cycle is relatively long, at least from a few decades to nearly a hundred years, this is a way to truly achieve environmental protection.
Reprinted from: China Paper Alliance Network
In the past two years, the corrugated paperboard has been greatly improved in all aspects of technical printing, driven by the low production costs of direct corrugated board printing, simplified processes, high efficiency, and safety and environmental protection. With the continuous upgrading of wide-format flexographic printing presses, several domestic flexographic printing machine manufacturers have actively developed and launched high-precision, high-line flexographic printing presses. In addition, along with it, digital plates and high-grade inks are widely used in corrugated board printing.
A flexo printer equipped with a high-line anilox roller can print a printed product with a low dot expansion rate and a high network cable. However, the higher the anilox roller is, the smaller the ink-carrying capacity of the anilox roller is because the uncoated paper can absorb the ink. Anilox rollers with low ink loading on higher screens cannot print solid colors on liner paper or white card paper. In this case, using coated paper for printing is an ideal choice. Printing on coated paper can result in a higher coloring, ie, a fuller, brighter color, compared to uncoated white or white kraft paper. In addition, the dot image is clearer, and it also has a very good gloss. The overall printing effect is bright, which is beyond the scope of ordinary white cattle cardboard or liner paper, and the use of coated paper in the outer packaging carton printing is more attractive to the eye. However, it is difficult to perform flexographic printing on coated paper directly, mainly because the coating on the surface of the paper fills the fiber-connected pores on the surface of the cardboard. After the ink is printed on the surface of the coating, the coated paper is coated. The coating on the surface prevents the paper from absorbing and penetrating the ink. The ink can only stick on the surface of the coating, causing the ink to drier during the printing process. If the ink cannot be dried in time, it is easy to produce prints, decolorize and rewetting under wet conditions, as well as problems such as difficulty in overprinting between colors and slow production speed. During printing, problems such as dragging, discoloration, and overprinting can be technically overcome by improving the performance of the ink. The speed of production is directly related to the drying speed of the ink. The ink drying speed is also related to the ink absorption of the paper itself. If the ink can quickly dry on the coating, naturally, problems such as dragging, decoloring, overprinting, and slow production are no longer a problem. Therefore, the core problem of post-flex printing on coated paper is the slow drying of ink. The drying time of an ordinary non-coated white bullnose or liner paper ink is about 3 seconds, and the ink drying time of a gray-white paperboard is about 20 seconds. As for the problem of slow drying of ink on coated paper, there is a new type of light-coated white ox cardboard for flexo printing. It absorbs ink quickly, and the drying time of ink is about 5 seconds. The speed of printing can be greatly improved, and other problems can be easily solved. Of course, it would be better if the press was equipped with drying equipment.
In recent years, in order to enable printing and packaging companies to easily overcome the difficulties in printing production, a light-coated white bull card between white and heavy coated paper came out. The light-coated white cow cardboard is coated with a very thin coating layer on the basis of the white cow cardboard, and the air knife coating method can be used to coat the surface of the paper smoothly. It has the printing advantages of coated paper, but also has the characteristics of easy printing of white cows. Because the light-coated coating is very thin, the thin coating does not easily crack and dust. The coating can remain very even. The high quality coatings based on china clay can make the ink better absorbed on paper. Such paper printing ink can be quickly dried in a short time, the ink drying quickly can improve the printing production efficiency, and even can directly print the press line slot, on some ink printing machines with drying device can be connected line folding or die cutting produce.
Due to the unique printing effect of coated paper itself, as the demand for the quality and quantity of packaging containers exquisite in the packaging market is increasing, the demand for coated paper for flexo printing is increasing year by year, and many brands of packaging Users are also happy to use coated paper as a packaging material for their products. One development approach is to upgrade the original rough packaging to high-end printing; another development approach is to reduce production costs, from the original offset printing to flexo printing. Therefore, at present, there are many carton plants that use some gray-white board paper for flexo printing. In fact, gray-white board is a kind of paper suitable for offset printing. If it is used after being printed on flexo, it will usually encounter some more troublesome problems. For example, the gray-white paper coating is usually very thick. During the production process, when passing through the hot plate of the paperboard production line, the surface coating is easily worn and scratched, causing defects in the subsequent printing. The thicker the coating, the slower the ink dries and the more difficult it is to print. And the coating thickness is easy to remove powder. The gray-white paper itself is a kind of recycled waste paper, and the physical properties of the recycled waste paper are lower than those of the original paper. At present, the domestic paper mills are generally restricted by the raw materials and technologies. Under the influence of the conditions such as the tensile strength, folding resistance, smoothness of the paper surface, and uneven coating stability, the coated white board is usually used. Only 250 grams or more of high-gram weight paper is produced. The higher the paper weight, the higher the paper cost. The use of low-weight paper is one of the most effective ways to reduce the cost of raw material production and to reduce waste production.
The performance of the paper depends mainly on its own fiber structure and surface treatment. The fiber structure of the paper is composed of primary fibers, waste paper fibers, and the raw fibers are fresh pure wood pulp fibers. The physical properties of the paper produced by the paper are strong and the fiber is hygienic. Clean, completely free of impurities sand. Jianmei Light-coated White Cattle Cardboard is a 100% pine fiber raw material that can be safely and directly used in food packaging. However, the harmful chemical substances such as dioxin, chlorine, bacteria, and heavy metals contained in recycled waste paper fibers are usually several times higher than the original paper, and are not hygienic and are not suitable for direct use in food packaging. In addition. The physical properties are certainly inferior to the same weight of the original paper. In addition, the waste paper contained in recycled waste paper contains more sand and gravel. It is easy to damage the production equipment, especially the anilox roller with squeegee device in the flexographic printing machine, because the sand in the recycling waste paper may fall to the surface of the anilox roller with high speed operation and the static condition. The friction between the doctor blades rubs, and the surface of the anilox roller is easily scratched, and then there is a printing defect that is difficult to make up. The use of clean original paper rarely happens.
Whether paper fibers use waste paper fibers or native fibers are recyclable materials, most people think that the use of recycled waste paper fibers can reduce the damage to forest resources, which is a way to protect the environment. This approach is to recycle used packaging boxes to paper mills, causing the paper to be processed into packaged packaging products to the end user and recycled to the paper mills, but this is a material recycling process. This waste paper recycling should not exceed 5 times. After 5 times, the recovered paper fiber becomes short and fragile and cannot be reused. This process cycle can be very short, from a few months to several years. However, in this recycling process, the paper mills have to produce large amounts of sewage and carbon dioxide, but also reduce the oxygen in the atmosphere. Another kind of planned and rational development and use of forest resources can really play a role in environmental protection. This approach is to plant trees. After growing, they are felled and sent to paper mills for processing into paper, and then several times more trees are planted. The practice of replanting five trees for each felling tree is a cycle of natural renewable resources. During the growth process, pieces of trees absorb the harmful carbon dioxide in the atmosphere through the photosynthesis of plants and create more beneficial oxygen. In addition, forests also play a role in protecting soil and water. Forests are a source of clean water for nature. Although this cycle is relatively long, at least from a few decades to nearly a hundred years, this is a way to truly achieve environmental protection.
Reprinted from: China Paper Alliance Network
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