The color quality of the container board product quality standard (GBI 3O24-gi) should be consistent with the appearance quality requirements such as neat and clean edges, smooth edges, and the number of wet blemishes, but there are no indicators of smoothness, glossiness, dustiness, and hue. However, users have requirements for the above indicators. In order to meet the needs of the market, our factory has done a lot of work to improve the smoothness, glossiness, dustiness and color index of boxboard.
The smoothness and glossiness of a box of cardboard. Due to the carton cover produced with boxboard, most of them are offset. The smoothness and glossiness of the boxboard directly and significantly determine and influence the quality of the print, that is, the appearance of the carton. Even if there are very few carton boxes that are not offset, the carton board has better "smoothness and glossiness will improve the appearance quality of the carton. The measures taken to improve the smoothness and glossiness of the carton board are briefly described as follows: (1) In the case of ensuring that the papermaking process is normal, the batter beating level shall be not less than 8OSR, but the difference between the bottom pulping degree and the bottom pulping degree shall not exceed SOSR, otherwise the paper will be stratified.(2) The line pressure of each press is allowed when the equipment conditions permit. Should be increased one by one, preferably the last press line pressure can reach IOO-13OkN/m.(3) Each roller must use its scraper to keep the roller surface clean and have a low roughness. The gteN moisture of the large cylinder is about 300p, the roller linear pressure is 6O-SOkNm, the steam inlet pressure of the drying cylinder is about O.32MPa, and the surface of the dryer cylinder and idler is kept clean and cleaned regularly.(5) Each cylinder Scraper should be kept good The cleaning effect, especially for the cylinders on the reverse side of the first set of cylinder stickers, is prone to fouling and must be regularly cleaned.(6) The moisture entering the calender paper is approximately 6% to 8%, otherwise there will be obvious electrostatic effects and appearance The temperature should be moderate, the line pressure of the calender should be appropriate.(7) Apply additives and use a good surface sizing machine.
2 Dust of container board The boxboard with commercial pulp board (KP) noodles will not be dusty, but with a good quality used paper box, even if it is used as a dough paste after artificial primaries, the paper dust degree is also prominent. problem. The dust is mostly black and white, followed by red. Black dust originates from ink, asphalt, and mineral impurities in used cartons, while white is mostly calcium plastic or plastic. Eliminating dust starts from two aspects: First, the reduction of dust is the area of ​​dust (preferably less than 1mm) to achieve dust, although not obvious. The measure is to increase the plasma density and conditional use of heat dispersion equipment. The second is to remove dust as much as possible. Its measures: (l) In the purification process of pulp cleaners and slag cleaners before use, the final residue must be discharged from the production process and must not be returned to reduce losses. The pulping system must be restarted, otherwise it will cause the dust to accumulate in the process. (2) Screens for pressure screens and vibratory screens can be screened with slit-type screens. 45～O. SOmm, the latter about lmm, multi-screen separator screen separator is generally O. Smm, because calcium plastic, ink, asphalt, sand and other particles are mostly granular impurities, slit-type sieve than the hole-shaped sieve has a higher removal rate. (3) In the equipment such as fiber separators, pressure screens, centrifugal cleaners, etc., light slag discharge outlets should be installed and slag discharge should be ensured.
3 box cardboard color box cardboard requires two aspects: First, the color should be basically the same, that is not allowed to clip flowers. The measures taken are that the concentration of slurry, pulp, dye, and other metering links should be accurate, the dye brand should be as stable as possible, and each batch of dye must be dyed before use. If slight changes occur, the process conditions should be slightly adjusted; The operating conditions such as dissolved concentration, temperature, and order of addition must be uniform in three shifts. The second is hue, which is called chromaticity. For the hue of the cardboard, each user has the habit of choice, the manufacturer must conduct market research to determine the hue of the cardboard, can be one, two or three, but not too much, as the factory's standard color, It is both user-accepted and features of the factory. To prepare a satisfactory standard color, the paste must be dyed and then used for production. Once the standard color is determined and stabilized, it must not be changed easily. For users with special hue, how much is to be produced in order to avoid the disorder of the paper's hue. The standard of container board products currently used in China has been used for more than seven years. During the period, with the continuous improvement of the appearance quality of packaging cartons, the boxboard used as raw material for cartons must also constantly improve the appearance quality. Therefore, when repairing the quality standards for the container board in the future, it is recommended to add some provisions for the appearance quality.
The smoothness and glossiness of a box of cardboard. Due to the carton cover produced with boxboard, most of them are offset. The smoothness and glossiness of the boxboard directly and significantly determine and influence the quality of the print, that is, the appearance of the carton. Even if there are very few carton boxes that are not offset, the carton board has better "smoothness and glossiness will improve the appearance quality of the carton. The measures taken to improve the smoothness and glossiness of the carton board are briefly described as follows: (1) In the case of ensuring that the papermaking process is normal, the batter beating level shall be not less than 8OSR, but the difference between the bottom pulping degree and the bottom pulping degree shall not exceed SOSR, otherwise the paper will be stratified.(2) The line pressure of each press is allowed when the equipment conditions permit. Should be increased one by one, preferably the last press line pressure can reach IOO-13OkN/m.(3) Each roller must use its scraper to keep the roller surface clean and have a low roughness. The gteN moisture of the large cylinder is about 300p, the roller linear pressure is 6O-SOkNm, the steam inlet pressure of the drying cylinder is about O.32MPa, and the surface of the dryer cylinder and idler is kept clean and cleaned regularly.(5) Each cylinder Scraper should be kept good The cleaning effect, especially for the cylinders on the reverse side of the first set of cylinder stickers, is prone to fouling and must be regularly cleaned.(6) The moisture entering the calender paper is approximately 6% to 8%, otherwise there will be obvious electrostatic effects and appearance The temperature should be moderate, the line pressure of the calender should be appropriate.(7) Apply additives and use a good surface sizing machine.
2 Dust of container board The boxboard with commercial pulp board (KP) noodles will not be dusty, but with a good quality used paper box, even if it is used as a dough paste after artificial primaries, the paper dust degree is also prominent. problem. The dust is mostly black and white, followed by red. Black dust originates from ink, asphalt, and mineral impurities in used cartons, while white is mostly calcium plastic or plastic. Eliminating dust starts from two aspects: First, the reduction of dust is the area of ​​dust (preferably less than 1mm) to achieve dust, although not obvious. The measure is to increase the plasma density and conditional use of heat dispersion equipment. The second is to remove dust as much as possible. Its measures: (l) In the purification process of pulp cleaners and slag cleaners before use, the final residue must be discharged from the production process and must not be returned to reduce losses. The pulping system must be restarted, otherwise it will cause the dust to accumulate in the process. (2) Screens for pressure screens and vibratory screens can be screened with slit-type screens. 45～O. SOmm, the latter about lmm, multi-screen separator screen separator is generally O. Smm, because calcium plastic, ink, asphalt, sand and other particles are mostly granular impurities, slit-type sieve than the hole-shaped sieve has a higher removal rate. (3) In the equipment such as fiber separators, pressure screens, centrifugal cleaners, etc., light slag discharge outlets should be installed and slag discharge should be ensured.
3 box cardboard color box cardboard requires two aspects: First, the color should be basically the same, that is not allowed to clip flowers. The measures taken are that the concentration of slurry, pulp, dye, and other metering links should be accurate, the dye brand should be as stable as possible, and each batch of dye must be dyed before use. If slight changes occur, the process conditions should be slightly adjusted; The operating conditions such as dissolved concentration, temperature, and order of addition must be uniform in three shifts. The second is hue, which is called chromaticity. For the hue of the cardboard, each user has the habit of choice, the manufacturer must conduct market research to determine the hue of the cardboard, can be one, two or three, but not too much, as the factory's standard color, It is both user-accepted and features of the factory. To prepare a satisfactory standard color, the paste must be dyed and then used for production. Once the standard color is determined and stabilized, it must not be changed easily. For users with special hue, how much is to be produced in order to avoid the disorder of the paper's hue. The standard of container board products currently used in China has been used for more than seven years. During the period, with the continuous improvement of the appearance quality of packaging cartons, the boxboard used as raw material for cartons must also constantly improve the appearance quality. Therefore, when repairing the quality standards for the container board in the future, it is recommended to add some provisions for the appearance quality.
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