Cots are important parts of a printing press, the printing quality has a significant impact. How to choose high-quality, high-performance printing rollers, printing plant to increase productivity and ensure the quality of print has very important significance. With the introduction of large quantities of high-grade, high-speed presses, printing rollers for higher and higher quality requirements. We can say that the high-end printer with high-quality printing roller to print a good product. Currently, the domestic printing, the foreign production of rubber roller quality, but the price is higher. The domestic production of cot places NBR roller based. As a result of synthetic rubber, the lipophilic, hydrophilic, solvent resistance and abrasion resistance are more foreign products have a certain gap. In order to meet the requirements of the domestic high-end printer at the same time but also to economic and timely provision of services to customers, Germany Wirth "Dr. Wirth" company, Germany Hartmann "HARTMANN" company in Shanghai jointly set up new material Wirth Technology companies, in 2002 in Shanghai to begin production in line with international new technology, new technology printing rollers. The products have been tested and many domestic luxury trial offset domestic and international professional bodies, in terms of performance of physical, chemical, machinery, much better than synthetic rubber roller, it has reached the international level of similar products. "Hartmann" series Polyurethane printing rollers, has the following main characteristics: First, the good ink receptivity and ink transfer. Cots polyurethane polymer by altering the molecular structure of the recipe, it is possible to achieve good ink affinity can therefore transfer ink and ink series with excellent results. Second, good solvent resistance. Polyurethane printing rollers of various types of ink, fountain solution, the solvent cleaning solution has a special anti-corrosion properties, ideal for UV inks and coatings Cots Cots (especially for boiling water, diesel , gasoline, benzene, alcohols and the like solution has good solvent resistance.). Third, good hydrophilic properties. Because the polyurethane material by adding a special formula, changed its internal molecular chain structure, to introduce and increase the water has a good affinity for polar groups, thus increasing the polyurethane water and fountain solution affinity sex. It is used as dampening water, alcohol series Cots, excellent four wide hardness range (Shore A15º ~ 90º), to meet different types of presses to rubber hardness requirements. Polyurethane material different from traditional natural rubber, different presses may be achieved by adjusting the hardness requirement molecular structure and size. It can be produced according to customer requirements Shore special hard rubber roller A60º ~ 90º and applied laminated, gravure printing, and other fields. Five, good physical properties. Long-term use will not make Cots harden, aging, and tear resistance, good resilience, low compression set, excellent abrasion resistance, therefore long life, easy to save, especially suitable for high-temperature, high-speed and high pressure production environment. Six, smooth surface, easy to clean. Hartman polyurethane rubber roller from the outside, bright color, smooth fine colloid surface, colloidal material and the mandrel bonding firm, so the ink and cleaning time and effort. Seven dedicated UV ink rollers. With traditional synthetic rubber roller different Hartman polyurethane rubber roller has excellent chemical properties, for all kinds of ink, fountain solution, the solvent cleaning solution has good resistance to anti properties. It can well adapt to UV inks Cots technical requirements in the pro-ink, solvent resistance and other aspects. Using the latest international formula, with Germany advanced production technology and techniques, settled in China for the production of "Hartmann" a new generation of polyurethane rubber roller, in addition to excellent quality, outstanding performance, but also has a very strong price competitiveness and attentive customer service measures. After many domestic enterprises to use the series of printing Cots, reflecting the good. And because of its high-grade quality mid-range price, so by the majority of customers of all ages.