High-grade napkin printing process
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In 2003, he went to Germany to visit Düsseldorf's four-year "Druba" printing machinery exhibition, and was exposed to the napkin and towel printing folding machine. At the same time, after visiting Germany, I visited and visited several cities in Italy. During the ten days abroad, I paid attention to the napkins used every day for three meals a day, and I paid attention to the collection of each meal. I wanted to see the European people’s consumption concept. Will gradually affect the Chinese. Once the table culture changes in China with a population of 1.3 billion, the use of napkins will bring huge business opportunities.
After returning to China, I began to pay attention to the production and use of domestic napkins. I found that the face towel handkerchief had a simple color printing product. I was fortunate enough to see the largest napkin manufacturer in Wuhan Green World. The founder of the company, Mr. Su Xiaohai, took us to visit the Italian OMT company. Production of tissue paper for napkin printers. I also saw the domestic four-color napkin printing machine. In Jiangsu, Zhejiang, Fujian and Guangdong, we have done a lot of research and found that most of the domestically produced napkins are sold overseas. The domestic use is only low-grade products, and the scope of use is limited to facial tissues. . Because of its material structure and the European and American sample structure I collected, there is a big gap.
The facial tissue is made of two or three layers of non-creased toilet paper through a hinge, printed with flexographic ink and then formed by a simple combination of a toothed roller and a paper foil roller. Such a product can only be used as a handkerchief in Europe. This kind of product is rarely used as a support on the table. In the napkin samples on the European and American table I collected, I found that the material was micro-sizing before printing. Such a napkin has a flat and wrinkle-free texture and a heavy feeling, and a special product is a three-layer structure in which the printed layer is in the middle, a micro-adhesive composite product, has a texture and a good flexibility, and the surface of the product is more beautiful. Some printing materials are not toilet paper but non-woven fabrics. After detailed comparison, we believe that the current domestic products are only facial tissues, not napkins used abroad.
If the napkins used on the table are to be produced in China at present, it is necessary to change the method of pressing the flowers into micro-sizing and then printing, so that the quality of the napkins can be qualitatively leap.
Regardless of the padded napkins used on facial tissues or on the table, the printing is done by flex-printing four-color or five-color printing and folding. However, the printing quality of domestic napkins and facial tissues is affected by materials, and the quality of the products still has foreign products. Larger gap. The reason is that China's current consumption is still at a relatively low level compared with Europe and the United States. It is impossible for domestic raw paper manufacturers to produce 100% wood pulp. At the same time, manufacturers reduce the cost and the amount of wet strength agent is small. The raw paper and the foreign raw paper can not meet the printing requirements in terms of surface smoothness and wet strength.
Flexo printing is an ink printing method. When the paper surface meets water, it is more likely to cause the paper to swell when the ink volume is large. The partial unevenness after printing affects the next printing, and it is easy to cause wrinkles, and the easily swellable printing material is intensified. The fluctuation of the tension makes the overprinting accuracy fluctuate greatly. It is difficult to produce a good product. Due to the poor wet strength of the toilet paper, after contact with the printing plate, the loose fibers on the paper are easily brought to the plate surface, and the paste is produced so that the printing cannot be continuously performed, which further affects the printing quality and the yield. .
At present, domestic imported equipment and domestically produced equipment are basically four-color continuous printing and then uniformly dried to perform embossing folding process, so it is difficult to guarantee product quality.
For various comparative studies, Xi'an Black Bull Machinery Co., Ltd. has developed a CRY460 napkin printing machine suitable for China's national conditions, which basically solves many problems in the printing process.
The napkin printing material is very elastic and can not be pulled and unwound. The domestic and foreign equipments use the belt surface to drive the unwinding on the unwinding. In order to ensure the printing registration accuracy and folding precision under normal tension, adapt to the changes of different materials and ink quantities. All levels are adjusted to a certain proportion of the length of the draw, purely mechanically adjusted belt unwinding will produce proportional fluctuations and cumulative errors, resulting in poor registration accuracy and printing difficulties. The unwinding of the CRY460 napkin printing machine manually adjusts the unwinding of the mechanical drive, changing the design to AC servo drive unwinding, finely detecting the tension with a low-friction cylinder, and controlling the speed difference rate by a closed-loop control. This first provides a reliable guarantee for prepress tension control. . After long-term operation, the registration accuracy is ≤±0.5mm; the folding accuracy is ≤±1mm; stable and continuous production is achieved.
CRY460 napkin printing machine changed the traditional printing method of four-color centralized drying, adding an oven in each color group, so that the swelling after the ink is inked in the napkin is eliminated after each color is printed without affecting the next color group, thus ensuring The flat and wrinkle-free, the printing quality is greatly improved, and the ink transfer amount of each color group is more stable and accurate, the service life is long, the steel gravure ink transfer mode is eliminated, and the ceramic mesh roller which is more precise and accurate in ink transfer is used, which is fine. Screen printing provides protection.
CRY460 has been specially designed to add a micro coating device after the unwinding. The device can apply the anti-paste solvent to the surface of the printing substrate while pressing, so that the fine loose fibers on the raw material will not stick. Paste on the printing surface, which greatly improves the printing duration, reduces the number of times the plate is cleaned, improves the life of the printing plate, and improves the yield.
According to the characteristics of the Italian OMT folding mechanism and the domestic folding mechanism, a new folding mechanism has been carefully designed to significantly improve the folding speed and precision.