5. Coated paper

Pigments, adhesives and auxiliary materials are made into coatings, which are coated on the surface of the cardboard through special equipment. After drying and calendering Form a smooth, dense coating on the paper surface to obtain coated paper with good surface properties and printing performance. The surface is smooth and bright white coated paper with polished surface. The basic weight is 80 grams/square meter. The overall thickness of the label is 165 times. The operating temperature range is -50 degrees to 90 degrees. The minimum labeling temperature is 7 degrees. Mostly used in cigarette boxes, labels, cartons, etc.

Coated paper Coated paper is also called coated paper. This kind of paper is made by coating a layer of white slurry on the base paper and then calendering it. The surface of the paper is smooth, the whiteness is high, the paper fibers are evenly distributed, the thickness is consistent, the elasticity is small, the elasticity is good, the water resistance and tensile properties are strong, and the ink absorption and reception are very good. Coated paper is mainly used for printing albums, covers, postcards, exquisite product samples, and color trademarks. The pressure should not be too high when printing on coated paper, and offset resin-based inks and glossy inks should be used. To prevent dirt from sticking to the back, methods such as adding anti-fouling agents and powder spraying can be used. There are two types of coated paper: single-sided and double-sided.

Weight: 70, 80, 100, 105, 115, 120, 128, 150, 157, 180, 200, 210, 240, 250 (g/m2)

Among them: There are many imported paper specifications of 105, 115, 128, 157 (g/m2)

Flat paper specifications: 648×953, 787×970, 787×1092 (currently there is no roll paper in China). 889×1194 is the specification of imported coated paper. --Molded paper is used as the paper core, and a layer of paint is added to the surface and calendered to fill the fiber gaps on the paper surface, and the printing effect is better.

It is a high-grade printing paper made by coating a layer of white paint made of calcium carbonate or white clay and an adhesive on the base paper, drying it and calendering it. It is divided into two types: single-sided coating and double-sided coating. The two types are divided into special numbers, No. 1, No. 2, and No. 3, with a quantitative range of 80 g/m2 to 250 g/m2. Coated paper requires high coating strength, no powder loss, and can be suitable for fine mesh printing of 60 lines/cm or more. There are three types of product numbers: special number, number one, and number two. Special coated paper is used for printing delicate products with a network cable of 150 grams or more; No. 1 coated paper is used for printing products with a network cable of 120-150 grams; No. 2 coated paper can be used for printing products with a network cable of less than 120 grams. Coated paper is not resistant to folding, and once creases appear, it is extremely difficult to restore. Offset coated paper: Also known as coated paper, it can obtain more detailed smooth dots when printing, and can better reproduce the layering of the original. The pressure should not be too high when printing on coated paper, and offset resin-based inks and glossy inks should be used. To prevent dirt from sticking to the back, methods such as adding anti-fouling agents and powder spraying can be used.

Snow-coated paper (matt art paper)--it is called coated paper that is coated with paint to make it non-reflective. Both sides are treated with special powder. The paper is soft and elegant, with a matte effect. It is visually refreshing and comfortable and non-reflective. It has high opacity, good printing color saturation and vividness, and excellent texture. Suitable for antique paintings, albums, calendars, magazines, books, special issues, catalogs, posters, etc.

Special-grade double-sided coated paper: The paper surface has higher gloss and better smoothness than ordinary coated paper. The paper surface is white and delicate, and the printing color is bright, with excellent gradation and contrast. It is suitable for high-end color printing. Suitable for high-end books, catalogs, calendars, posters, and covers.

Double-sided coated paper

The paper is smooth and white on both sides, with good gloss and high opacity. After color printing, the pattern effect is bright and the color gradation is good, suitable for color printing . Suitable for general books, catalogs, calendars, posters, covers, etc.

Single-sided coated paper

One side is coated and the other side is glued. Therefore, one side of the paper is bright, smooth and evenly absorbs ink. It is suitable for single-sided color printing and can be printed on the back. Gluing and other processing.

Suitable for labels, posters, and release paper

Coated paper is mainly used for printing albums, covers, postcards, exquisite product samples, and color trademarks. The pressure should not be too high when printing, and offset resin-based inks and glossy inks should be used. To prevent stains from sticking to the back, methods such as adding anti-stain agents and powder spraying can be used. Coated paper is an important material in the packaging and decoration printing process. The printing quality of its products depends largely on the characteristics of the material itself and the operator's grasp of the characteristics of the paper. In other words, to print coated paper products well, corresponding technological and technological measures must be taken according to the characteristics of the paper. Therefore, it is very necessary to understand and understand the technological and technical requirements for printing coated paper.

The types of coated paper are divided into casein coatings based on the properties of the coatings. Therefore, coated paper is also called coated paper. Due to process defects in some domestically produced coated papers, they are prone to varying degrees of powder removal and expansion and contraction. In particular, single-sided coated paper is prone to curling, which affects the accuracy of overprinting. Improper operation of certain processes for printing coated paper can easily lead to staining (over-priming), powdering, slow drying, lack of bright star color, etc. Therefore, you should pay attention to the following issues.

1. For each batch of coated paper, before it is put into use, a series of issues related to printability such as smoothness, pH, absorbency, dryness, stretchability and surface bonding strength of the paper should be addressed. , conduct testing and analysis, and then take corresponding process measures according to the characteristics of the paper, such as adjusting the viscosity, fluidity, dryness and anti-sticking measures of the ink, in order to achieve standardized and scientific production and prevent poor printing;

2. It is necessary to adjust the pad technology and printing pressure to ensure that the printing ink layer is uniform and bright. The printing pressure on coated paper should be uniform and appropriate. Excessive pressure can easily cause powder dropout, unclear dot imprints, and increased plate wear. On the contrary, it is easy to cause the dot imprint to be weak, and to blindly increase the ink layer to make up for the blooming of the layout caused by insufficient pressure. In this way, it is easy to have adverse consequences such as sticking, slow drying, and poor overprinting. Therefore, the pressure on the printed coated paper must be even. , to be appropriate. It is appropriate to use neutral to hard materials for the lining.

3. When printing trademarks and packaging products on coated paper, light colors are often used as the background color and are overprinted by overlapping colors. Improper printing process can easily cause some problems and affect the quality. Therefore, when preparing the base ink, you should try to use heat-resistant and light-resistant ink, and the diluent is best mixed with gloss paste, so that the base color can be placed The printing effect should be good at the end to prevent the base color from being easily rubbed and damaged by the ink layer.

4. Since the surface of the copper plate is smooth and its ink absorption capacity is poor, when printing a large-format solid version, you should try to achieve "deep ink and thin printing". That is to say, make the ink darker so that the ink layer will be corresponding or thinner during printing, which will not only meet the printing hue requirements, but also reduce the chance of overprinting and prevent overlapping colors from being printed. In addition, due to the poor adhesion of the paper, the printed ink layer is sometimes prone to discoloration due to powder loss. For this reason, No. 19 resin oil can be used as the ink adjustment oil for the first color of printing. In order to make the overlay ink layer printed brightly, some varnish and drying oil can be added to the ink.

5. Due to the large amount of paint on coated paper, powder removal and black shadows on the printed surface are often encountered during the printing process. When this happens, you should pay attention to check whether the plate mounting process is being operated, such as whether the printing plate is padded too heavily, because if the pressure on the paper surface is too high, it is easy to crush the powdery paint on the surface of the coated paper, causing depowdering and Dark shadow spots. In addition, you should also check whether the viscosity of the ink is appropriate. If the printing ink layer is too thick and sticky, it is also one of the reasons for the powder to fall off the paper and accumulate on the layout. In this case, you should consider using auxiliary materials to adjust the ink. Quality, the above quality problems can be better overcome.

6. It is necessary to master the anti-sticking technology of coated paper printing. Coated paper has weak ink absorption and a relatively smooth back. Printing on pages that receive a large amount of ink or multi-color overprinting is prone to sticking problems. Therefore, anti-sticking measures should be taken to overcome them. For example, use varnish to first apply an appropriate amount of paper. Stir the anti-sticking agent evenly until it becomes liquid, then add it to the ink and stir evenly. You will get better anti-sticking effect during printing.

However, the amount of anti-adhesive agent should be controlled reasonably and should not exceed 4 to avoid undesirable problems such as emulsification of the ink, blooming of the printing ink layer, and reduced gloss of the ink layer.

In short, as long as you master the characteristics of printed copperplate paper and correctly control the printing and operating techniques, you can not only improve printing efficiency, but also effectively ensure printing quality.

Coated paper is called pink paper in Hong Kong and other regions. It is mainly used for printing covers and illustrations of high-end books and periodicals, color pictures, various exquisite product advertisements, samples, product packaging, trademarks, etc.

Coated paper can be divided into single-sided coated paper, double-sided coated paper, matte coated paper, and textured coated paper. The requirements for coated base paper are uniform thickness, small stretchability, high strength and good water resistance. The paper surface must not have spots, wrinkles, holes and other paper defects. The coating used for coating is composed of high-quality white pigments (such as kaolin, barium sulfate, etc.), adhesives (such as polyvinyl alcohol, casein, etc.) and auxiliary additives. of. This kind of paint with high fluidity and high solid content is applied thinly and evenly on the base paper through a coater, then dried, rolled into a roll on a paper winding machine, and then sent to a super calender for pressing. Light finishing, final cutting, paper selection, and packaging.

The characteristics of coated paper are that the paper surface is very smooth, high smoothness and good gloss. Because the paint used has a whiteness of over 90, extremely fine particles, and is calendered by a super calender, the smoothness of coated paper is generally 600 to 1000 seconds. At the same time, the paint is evenly distributed on the paper and appears white. The requirements for coated paper include high coating strength, a thin, uniform coating, and no bubbles. The amount of adhesive in the coating is appropriate to prevent the paper from de-powdering and linting during the printing process. In addition, the absorbency of coated paper to xylene It must be appropriate and suitable for fine mesh printing above 60 lines/cm.

Cloth-grained coated paper is pressed with old felts. In addition to its flat surface and high whiteness, it also makes the printed graphics and pictures have a three-dimensional effect. Therefore, this coated paper can be widely used. Used to print pictorials, advertisements, landscape paintings, exquisite wall calendars, portrait photos, etc.

Coated paper is a common name, and its official name should be printing coated paper. It is very commonly used in real life today. The beautiful wall calendars, posters sold in bookstores, book covers, illustrations, art books, picture albums, etc. are almost all made of coated paper, as well as various exquisitely decorated packaging, paper handbags, and labels. , trademarks, etc. also use it extensively. Paper is divided into glossy and matt (matte) coated paper.

Detailed classification of coated paper (extracted from Changsha Xingtuo Paper Notes

Color-printed coated paper includes single-sided coated paper, double-sided coated paper, matte coated paper, and cloth-grained coated paper Paper is divided into three grades: A, B, and C according to quality. The main raw materials of coated paper are coated base paper and coating. The requirements for coated base paper are uniform thickness, low stretch, high strength, and good water resistance. No spots, wrinkles, holes or other paper defects are allowed. The coating used for coating is composed of high-quality white pigments (such as kaolin, barium sulfate, etc.), adhesives (such as polyvinyl alcohol, casein, etc.) and auxiliary additives. This coating with high fluidity and high solid content is thinly and evenly applied to the base paper through a coater, then dried, rolled into a roll on a paper winding machine, and then sent to a super calender for calendering Finishing, final cutting, paper selection, and packaging.

The characteristics of color spray coated paper are that the paper surface is very smooth and smooth, and the glossiness is good because the whiteness of the paint used is above 90. The particles are extremely fine and have been calendered by a super calender, so the smoothness of coated paper is generally 600 to 1000 seconds. At the same time, the coating is evenly distributed on the paper surface and appears white, which is a requirement for coated paper. The coating must be thin, uniform, and bubble-free, and the amount of adhesive in the coating must be appropriate to prevent the paper from powdering and linting during the printing process. In addition, the xylene absorbency of the coated paper must be appropriate.

Texture. Coated paper is pressed with old felts. In addition to its smooth surface and high whiteness, it also makes the printed graphics and pictures have a three-dimensional effect. Therefore, this coated paper can be widely used to print pictorials, advertisements, and landscape paintings. , exquisite calendars, portraits, etc.

Detailed classification of coated paper

Coated paper can be divided into single-sided coated paper, double-sided coated paper, matte coated paper, and textured coated paper. According to quality, they are divided into three grades: A, B, and C. The main raw materials of coated paper are coated base paper and coating.

Coated paper includes glossy coated paper and matte coated paper. Generally speaking, matte paper mostly refers to matte coated paper, and coated paper mostly refers to glossy coated paper;

Both The printing price is the same, but the printing process requirements of matte pink paper are slightly higher, which can easily lead to overprinting;

The surface of "matte pink paper" is non-reflective, has good ink absorption, and the printing ink is relatively thick, so it is dried in the shade. It takes longer;

The difference between coated paper and offset paper is that both sides of coated paper are coated, while offset paper is not. Offset paper is similar to the base paper of coated paper. I hope the above can help you!