Recently, Hebei Yinzhou Spring Silver Star Rubber Roller Co., Ltd., which has 30 years of history in the production of printing rubber rollers (formerly the Yuxian Rubber Roller Factory), has launched a series of environmentally-friendly printing rollers suitable for high-speed machines. This new product has received great attention from the industry. As the leading company in the domestic rubber roller industry, Hebei Yinzhou Chunfeng Yinxing Rubber Roller Co., Ltd. vigorously implements the strategy of “invigorating enterprises through science and technology”, pays close attention to the development of technology, absorbs advanced achievements, and devotes itself to research and development and replacement of rubber roller products. . Every year, the company has more than 10 new results come out, there are five new products to fill the gaps in the country, including YJ-A printing roller, office equipment, super wear-resistant environmental protection paper roll two new products won the national invention patent , Created the company's core competitiveness. In recent years, with the rapid development of the printing industry and the continuous influx of imported printing machinery, the market has become increasingly demanding on the quality of printing products and printing speed. How to adapt to the requirements of the printing industry to develop in the direction of high-speed and multi-coloring becomes a Spring Wind Silver Star Cot Co., Ltd. focuses on the project issues. In order to develop this new type of high-speed printing roller, Spring Silver Star Roller Co., Ltd. has made more than two years of hard work, consulted a large number of patent documents of relevant foreign companies, analyzed their technology, and passed hundreds of tests. New formulas are selected. On the basis of analysis and comparison, technical problems that require key breakthroughs are identified, and new YJ-C printing rollers adapted to high-speed machines are successfully developed. In the formulation design and material selection, the EU’s latest requirements for environmental protection have also been fully considered. The new type of printing roller produced with the optimized formula not only meets the level of foreign rubber rollers, but also meets the ROHS environmental protection requirements of the European Union. Therefore, it can meet the requirements of imported machines and high-speed machines used in China, as well as supporting and printing presses. Roller outlets create the conditions. Spring Wind Silver Star Cot Co., Ltd. developed a new type of printing roller has two major characteristics: 1 low shrinkage, low expansion and high elasticity; 2 environmental protection.
1. Low shrinkage, low expansion and high elasticity in the printing roller
Among the rubber performance indicators, the most important is oil resistance and elasticity. According to the national standard GB/T2287-200 l "printed rubber roller", the indicators of oil resistance to linseed oil resistance and No. 2 jet fuel (kerosene) are provided. Among them, the oil resistance to linseed oil reflects the expansion or contraction of the ink in contact with the rubber roller, and the resistance to jet fuel on the 2nd scale reflects the expansion or contraction of the cleaning agent in contact with the cleaning agent. When the negative value of the oil resistance data is too large, the rubber roller will shrink during use, and the rubber and the infiltrated ink will be firmly combined and difficult to clean; after a period of time, the surface will form a layer of bright ink dura mater. The ink-transmitting property is greatly reduced i and then used, the surface dura has no elasticity, and even cracks occur, resulting in a low service life.
When the value of the oil resistance data is too large, the amount of oil absorption is large and the expansion phenomenon occurs. The uneven expansion of the various parts of the rubber roller often causes pitting and unevenness, which also shortens the service life.
The elasticity of the rubber roller is also an important performance. The elastic roller has small deformation and quick recovery, which is suitable for the high-speed operation of the printing machine.
In fact, achieving low shrinkage, low expansion, and high elasticity in the formulation is technically very difficult, especially oil resistance to linseed oil, and there are different degrees of negative values for rubber rollers at home and abroad. Excessive elasticity may result in decreased rubber strength.
The comparison of the measured performance of the new roller rubber compound with the imported rubber material and the foreign rubber roller has the following characteristics:
1 Low contraction. In all domestic and foreign rubber compounds or rubber rollers, the value of negative linseed oil is negative, but the negative value of the new formula rubber of Spring Silver Star Co., Ltd. is the smallest, indicating that it has the smallest shrinkage in the ink.
2 low expansion. After immersing No. 2 fuel (kerosene), the weight change rate was mostly positive, and the lower half was negative. The new formulation of Chunfeng Yinxing Rubber Roller Co., Ltd. had a very small positive value, indicating that it had little swelling during cleaning agent cleaning.
3 high elasticity. The elasticity exceeds the level of domestic excellent products and is equivalent to that of foreign companies.
4 deformation is small. In order to achieve the above performance, Spring Silver Rubber Co., Ltd. uses a higher price of imported rubber and additives, with a scientific formula, to achieve the smallest deformation of the roller, so that this performance index has reached the international advanced level.
2. Meet EU environmental protection requirements
In recent years, the European Union has adopted strict environmental protection laws and regulations, requiring inks, rubbers, etc. to meet the requirements before entering the EU market. Other countries (including China) have also adopted or will adopt corresponding environmental protection policies.
The EU ROHS Directive (R0HS restricts the use of hazardous substances) limits heavy metals (lead, cadmium, mercury, and hexavalent chromium) as well as polybrominated biphenyls (PBB) and brominated diphenyl ethers (PBDE). The EU also restricts the possibility of the presence of specific amine-generating substances in the printing cylinders. These harmful substances all harm human health.
Spring Silver Star Rubber Co., Ltd. keenly saw this new situation. When developing high-speed machine-printed rubber rollers, the environmental protection requirements were taken into account from the very beginning, and formula design and material selection were made with the aim of the most stringent EU environmental protection indicators.
Since rubber, various additives, and the shaft core may contain lead, cadmium, mercury, and hexavalent chromium, as well as harmful specific amines, the analysis must be performed on a material-by-material basis, so that the finished rubber roller does not exceed the limit value.
After internationally recognized SGS testing, the new product of Spring Wind Silver Roller Co., Ltd. fully complies with the requirements of the EU ROHS Directive and related specific amine directives.
Spring Star Silver Star Co., Ltd. uses its own technology to develop a high-speed machine-use printing roller that meets EU environmental protection requirements, which is the first in the domestic rubber roller industry. The environmental protection rubber roller not only can meet the requirements of high printing quality of imported machines and high speed machines, but also ensures the environmental protection of the printing shop, and it also helps China's export of printing machinery.
Reprinted from: Print Magazine
