The use of light-sensitive material by screen printing photomechanical process (so that the screen holes on the graphic part of the screen plate through hole, rather than the graphic part of the screen hole was blocked). When printing color bags squeezed by squeegee, the ink is transferred through the graphic part of the mesh to the substrate, the same as with the original graphic form. Screen printing equipment is simple, easy to operate the valve port custom color bags, printing, plate making simple and low cost color waterproof bags, adaptability. Screen printing a wide range of applications common print: color paintings, posters, business cards, binding covers, merchandise signage and printing textiles woven bags can be used as food packaging Hebei color bags, the first article in the PP and its components PE which does not contain toxic substances, the premise is not renewable raw materials bags. Whether renewable materials contaminated by toxic substances in the process of recycling, this process can not control or monitor the cost is too high. Anyway, the most recycled material is made of semi-permeable, transparent to draw up the same type and specifications of products, each batch of not more than 150,000. 6.2 Sampling 6.2.1 bags look and qualified to determine the deviation in accordance with a normal sampling program GB / T2828 provisions were (Table 5), each bag as a sample unit. Bulk sample size range acceptance number Ac Rc failed to determine the number of low-pressure polyethylene plastic bag use:... A garbage bags, bags strain; B convenient bags, shopping bags, handbags, vests bags; C storage bags; D ... Pat plastics are widely used in various fields of agriculture, industry, construction, packaging, national defense industry and people's daily life. Agriculture: a lot of plastic is used to manufacture film, seedling films, big films and irrigation pipes, fishing nets, floats and other farming. Industrial areas: electrical and electronic industry is widely used in the production of insulation materials and plastic packaging materials; machinery industry using plastic drive gears, bearings, bearing, and many parts instead of metal products; chemical industry used to make plastic pipes, each container and other kinds of anti-corrosion materials; customized valve port color bags, Xin Yu Package (certified), color printing bags provided by Xiong Yu Xin plastic packaging plant. Xiong Yu Xin plastic packaging plant (www.xinyusl.com) (www.xinyusl.com) Hebei Baoding, composite materials packaging products leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, the maximum Limits to meet customer needs. Yu Xin leader in packaging with the staff warmly welcome all inquiries negotiations to create Xin Yu packaging better future.