Transformation of glue system
The comprehensive cost mainly occurs on the tile line, and the technological reform of the tile line is particularly important. Earlier tile lines were designed for high-gram heavy board, but now they are forced by cost pressure. Carton companies have begun to use low-gram weight paper, which requires the accuracy of equipment to be further improved. For example, for 250g facial tissue, if the sizing amount is larger, the glue will not penetrate the facial tissue easily and will not penetrate the corrugated paper. After the weight of the facial tissue is reduced, the glue thickness required for sizing reaches 0.6mm ～ 0.15mm. But now the glue thickness is much larger than this value, and the accuracy of the equipment itself is not high, the error of glue application is greater, which will cause the problems of collapse and cardboard softening. The original sizing system cannot be adapted, so it is necessary to transform the entire sizing system.
Glue line before transformation: the width of the glue line is large and uneven, and the facial paper is obviously fluted, resulting in a poor printing effect. If the pressure is reduced, the cardboard is soft, and the paper weight must be increased. The speed of the tile line drops sharply, and the amount of glue used is large.
The modified glue line: the width of the glue line is greatly reduced, and the glue line is thin and neat; the pressure change of the cardboard increases, providing space for reducing the weight of the paper; the facial paper is not corrugated, which improves the flatness of the cardboard.
Once the sizing system is reformed, the quality of the glue needs to be improved to a certain extent because the glue becomes thinner and thinner. In the bonding process of cardboard, the quality of the glue itself plays the most important role. The quality of the glue directly affects the bonding quality of the cardboard.
Reform of glue formula
The production of high-quality paperboard with low-gram weight paper requires the cooperation of high-precision equipment and excellent performance glue. As far as the technical reform of the components of the gluing system is concerned, there are no two obstacles: The transformation of the glue device, the second is the innovation of the glue configuration, the above two points must be decided according to the actual situation of each enterprise. In the case where starch, caustic soda, borax and other materials are used to make glue on their own, the quality of the starch material should be strictly controlled. The water content of starch should not be too high, generally it should be kept at 12% to 18%: the protein content in starch should not exceed 1%, and the content is preferably less than 0.5%.
To determine the quality of the glue formulation, it can generally be considered from the aspects of adhesive strength, drying speed, viscosity, solid content, pH value and so on. Sufficient adhesive strength is the basis to ensure the function of the carton. Generally, the test method of high temperature heat change is used to test the adhesive strength of the cardboard. In most cases, the faster the drying speed of the glue, the better, generally manual bonding The process speed is slow and requires a long initial drying time. The machine's bonding speed is fast and requires a short initial drying time. Therefore, the glue configuration that matches the bonding process is what is required in production. Viscosity value is the main factor that directly affects the quality of adhesion. If the viscosity is too large, the coating of the glue is too thick, the amount of glue consumed is large, and the drying speed is slow, while the viscosity is too small, the coating is thin, and the drying is too fast, it is easy to appear Poor adhesion, so the viscosity should be checked in real time during production, and the formula should be regularly improved and adjusted to keep the viscosity within the ideal viscosity range. The higher the solid content of the glue, the stronger the adhesion, the faster the drying speed, the higher the production efficiency, the less moisture absorbed by the cardboard, and the produced cardboard has good hardness, so in the case of other technical indicators consistent, a high solid content is conducive to Improve production efficiency and maintain stable quality. In the process of glue formula reform, the most important thing is to constantly check various technical parameters and monitor the quality of cardboard in real time. Only after the product quality reaches a stable state for a long period of time can the final glue formula be determined, but This is not static, and quality monitoring at any time must be implemented for a long time, and adjustments should be made in time if problems occur.
New software and new system add color to wet end equipment
With the emergence of automatic stacking, control systems and high-speed high-quality feeding systems for various equipment, the quality of carton design and the overall performance of the carton are becoming more and more important. The quality of the cardboard is the most critical factor in determining the quality of the carton.
Modern carton factories cannot accept warped cardboard, delaminated cardboard, cracked cardboard, or cardboard of insufficient stiffness.
Throughout the production process, control the tension of the original paper web (especially during the splicing process), the temperature and the humidity of the paper, the accuracy of the amount of paste, the solid content of the paste, the viscosity and the temperature are all stable to the quality of the cardboard Play an important decision. The rapid heating and uploading control of the hygroscopic belt on the double-sided machine is of great significance for controlling the warpage of the cardboard. In the past few years, the above projects have been the focus of supplier research and development. In today's market that calls for more new corrugated shapes to meet the needs of different new packaging designs, the rapid replacement of original paper rolls, the setting of the splicer and the rapid change of corrugated shapes on the single-sided machine are all essential functions of the wet end equipment. Very few operators are needed for advanced wet end equipment, and errors can be reduced, thereby reducing costs.
As we all know, the main purpose of investment in the wet end equipment on the tile line is usually to improve the quality of the cardboard, and improving the performance of the wet end equipment helps to improve the overall production efficiency of the factory. Since the wet end equipment is the "core" of the carton production workshop, the machinery suppliers have also continuously invested funds to develop new equipment to meet user needs:
The wet end management software of Vonderheiden in Germany is a software system that helps old equipment reach modern new equipment standards. Through the software system, the operation of the entire tile line can be controlled in one terminal, and all production units are connected via Ethernet. Using a color touch screen, the operator can control the bridge, the original paper holder and the original paper transportation system including synchronous paper receiving, and can also be used in conjunction with production planning software, such as Kiwiplan. In addition, the operator can also control the single-sided machine, glue application system, preheating section, pull-out roller and heating section.
The design goal of lCSa || in Japan lsowa is to: smoothly pick up paper, eliminate the warpage of the paperboard, and reduce the tension vibration of the paper web that often causes the delamination of the paperboard. ICSll's paper receiving speed is 400m / min (catch-end paper receiving is 250m / min). At the same time, because it can maintain smooth operation and stable web tension under bad conditions, thus ensuring the quality of the cardboard.
These new functions and new advantages of ICS | 1 are equipped with CCTl-tile wire continuous tension infeed system. The purpose of developing CCTl is to reduce and eliminate the paperboard delamination phenomenon that occurs on single-sided machines and double-sided machines. Because the temperature of the base paper is easy to drop, under high-speed operation, the quality of the receiving paper is easily affected, so the cardboard is prone to delamination. In order to avoid this phenomenon, Isowa developed CCTl, which has a special tension control roller, combined with AC servo drive motor, PLC and floating roller guide roller. When the base paper passes through the rollers of CCT1, the fluctuation of the power of the base paper generated by the paper receiving machine is eliminated, and the continuous tension is set by the advanced control system of CCT1. Stable tension can not only reduce or eliminate the delamination of the cardboard, but also eliminate other common problems, such as fluting and warping. The floating roller driven by AC servo motor can make the paper receiving more stable and reliable, and make the paper receiving point more accurate. PLC control not only ensures accuracy, but also makes the equipment easier to maintain.
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