Talking about paper performance and coloring effect
We are a big printing company in Shenzhen China . We offer all book publications, hardcover book printing, papercover book printing, hardcover notebook, sprial book printing, saddle stiching book printing, booklet printing,packaging box, calendars, all kinds of PVC, product brochures, notes, Children's book, stickers, all kinds of special paper color printing products, game cardand so on.
For more information please visit
http://www.joyful-printing.com. ENG only
http://www.joyful-printing.net
http://www.joyful-printing.org
email: info@joyful-printing.net
Paper and cardboard are one of the main raw materials for printing. After China's accession to the WTO, the quality standards of books and periodicals are in line with international standards, and the number of printed materials in color is increasing. The quality requirements for paper and paperboard are getting higher and higher. With the rapid development of offset printing, the quality standardization of China's paper industry is gradually improving. However, so far, many printing companies have not done a good job in the storage and storage of printed paper and paperboard, and have not adapted to the requirements of the rapidly developing printing situation in the future. Therefore, the formalization and scientific management of the storage and storage of printed paper and cardboard are imperative.
First, Current status of storage and storage of offset paper and cardboard
In the past 10 years, the printing industry in various regions has developed rapidly. However, as far as I know, there are many printing factories, especially small and medium-sized printing factories. The paper and cardboard storage and storage work has not improved much. Specifically in:
1. Some factory leaders only realize that increasing the amount of paper fed and storing more paper is beneficial to reduce printing failures. However, it does not pay attention to the storage and storage of paper and paperboard according to scientific principles, and it is not an important part of the production process.
2. Some factories have poor economic returns, lack of working capital, and there is no shelf life for paper and cardboard, let alone improve storage and storage conditions.
3. The “four defenses” are not complete in preventing moisture, sun protection, anti-folding and heat protection. Some factories only do moisture protection, but they do not protect themselves from sun and heat. Some factories only do sun protection and heat protection, but they are not moisture-proof. Some factories do not do well in folding prevention work.
4. There are many factory leaders and custodians who only know the weight and name of commonly used papers, but little is known about other paper performance indicators and storage and storage knowledge.
5. Some factories do not even have simple loading and unloading equipment. From paper to factory, they are completely loaded and unloaded by hand. It is easy to cause damage to the outer packaging and even the internal paper.
6. Some factories have stored the whole flat paper for a long time, and the iron bars or steel wires are directly pulled into the paper edge. Even if the four sides are cut before printing, the paper is deformed due to the deformation of the paper, which causes the paper feeding and paper feeding during printing to be poor. Overprinting is not allowed.
Second, how to implement formal scientific management of storage and storage
High-speed economic development must keep the working environment and social environment in good condition, which is a prerequisite for all future production activities. The paper warehouse is an important workshop or department in the printing factory. The factory leaders should not only pay attention to it from the ideological point of view, but also constantly learn the scientific and advanced experience of paper and cardboard in storage and storage, so that the storage and storage work can adapt to the rapid development of printing after entering the WTO. Situation requirements.
1. The effect of ambient temperature and humidity on the printability of printing paper and paperboard. The moisture content of paper and paperboard at the factory often does not meet the printing requirements, should be 6% to 7%, plus the packaging is not perfect, after long-term transportation or in the absence of good conditions. The paper warehouse has been stored for a long time. Such papers may cause serious defects such as poor paper feeding, improper paper delivery, wrinkles, inaccurate overprinting, and dirty back surface, resulting in a large number of waste products. Therefore, in the offset printing workshop, not only the air conditioning equipment should be installed when the factory is built, the temperature and humidity of the workshop should be kept within a certain range, and the humidity and paper must be adjusted for the paper and paperboard sent for printing. The water content is balanced with the relative humidity of the plant. The purpose is to adapt the paper and the sheet to the working environment of the printing workshop, correct the paper deformation, improve its dimensional stability, and improve the mechanical strength such as folding resistance. The method of humidity control has four methods: natural hanging and drying method, air-drying method of paper machine, using lifting temperature to achieve uniformity of water content of paper pulp, and using infrared radiation to eliminate the phenomenon of paper edge and lotus leaf. If the temperature and humidity of the storage place after the paper cutting is not normal or there is no air conditioning equipment in the workshop, even after the humidity control process, the paper will be affected by the environment, causing the water content to change and deform, and the above-mentioned serious failure will also occur when printing on the machine. From this point of view, in the absence of air conditioning equipment, since the relative humidity is determined by the temperature, the paper must be stored under conditions similar to the temperature and humidity of the printing shop. In addition, put the paper in the printing workshop as much as possible a few days before printing to balance the temperature and humidity of the workshop.
2. Paper warehouse conditions and storage methods
2.1. From the above, it is known that the paper library and the workshop are all places where a certain temperature and humidity must be maintained. Factory leaders should be rationally aware, ideologically important, and strive to improve the conditions of the paper warehouse, whether in winter or summer, should try to keep it within a certain range. Never use a used shed or basement as a paper warehouse except for the basement with air conditioning.
2.2. Generally, the paper warehouse should be built in the factory area near the entrance of the car, and the other side has good roads to the printing workshops. The first floor of the warehouse should be about 1.5m above the ground so that it can be unloaded directly from the car. It can also prevent water from flowing into the paper library during the rainy season and soaking the paper. The warehouse should be bright and dry, and the windows need not be too much. It is best to have ventilation ducts to avoid direct blowing of cold air into the paper basket during winter and rainy weather. The doors and windows should be designed to avoid direct wind and direct sunlight on the paper basket.
2.3. In the construction of paper warehouses, measures should be taken to prevent rodents and pests. The paper and cardboard and other materials stored in the warehouse should be carefully inspected. The library should be sprayed regularly and rodently.
2.4. A variety of different paper and paperboard should be stacked and stacked. The storage area and the forklift channel are drawn on the ground. The width of the main channel is between 1.5 and 2.0 m, and the side channel is between 1.0 and 1.5 m. Paper should not be stacked 0.25 to 0.5 m from the wall.
2.5. Paper and cardboard are not allowed to be stacked on the concrete floor. They should be laid flat on a wooden paper table for the forklift to transport. Please pay attention to the neat verticality of the pallet to prevent people from being injured. The temperature in the warehouse can be controlled at 18-20 ° C, the relative humidity is 40%-65%, and the winter temperature must be above 15 °C. In summer, excessive moisture should be prevented. Dust and oil are also taboo, so grease should not be used. Stored in a paper library, pay attention to dust when blowing wind.
2.6. When the roll paper is stacked, the end face should be placed on the wooden board. The height of the code should be limited. If the round roll is laid for too long, it will be deformed, which will affect the normal operation of the rotary press. When transporting and stacking paper and cardboard, it is absolutely not allowed to carry out rough loading and unloading. It is not allowed to throw the paper wrapped in the web or wood splint from the height, and it is not allowed to use tools such as iron hooks that can damage the paper. Pushing the web should be pressed. The direction indicated by the arrow prevents the loose roll.
2.7. Acceptance, registration, inspection, disassembly and selection of paper and cardboard are essential tasks, and warehouse custodians should be responsible and meticulous.
2.8. If it is unavoidable, some paper may be temporarily stored in the open air. It must be covered with a plastic cover that does not leak water on the paper or paper table. Special personnel should be patrolled to prevent fire caused by cigarette butts or other Mars. Smoking and matches, lighters and flammable materials are absolutely prohibited.