China Dry Net sludge is sludge produced by various separation methods in water supply and sewage treatment. A 400,000-ton/day municipal sewage treatment plant can produce 400 ton of municipal sludge containing 85% to 90% of water a day. Cities typically have two or three sewage treatment plants of similar size, producing 800 to 1,200 tons of water-containing sludge a day. More than 60 water treatment plants have been established in Shandong Province, with an annual discharge of 27 million tons of sludge. The water content of mechanical dewatered sludge produced by urban sewage treatment plants is generally about 80%. It also contains refractory organics, heavy metals and salts, as well as a small amount of pathogenic microorganisms and parasite eggs. The sludge can be treated without treatment. Emissions, these components will have adverse effects on the surrounding environment and even cause infectious diseases.

The treatment and disposal of municipal sludge produced by a municipal wastewater treatment plant is one of the problems in the domestic and foreign environmental engineering community. The Shandong Provincial Tianli Drying Co., Ltd. led by Shandong University and China Everbright Water (Jinan) Co., Ltd. participated in the Shandong Provincial Provincial Environmental Protection Industry Technology R & D Special Fund Project - "The Municipal Sludge Cost Reduction Quantification and Resource Set Technology and "Equipment" based on the existing research and application of municipal sludge treatment and disposal technology, through the research and development of advanced sludge reduction technology research and development, sludge resource utilization technology research and development, the formation of municipal sludge low-cost reduction And complete sets of technologies and equipment to achieve effective treatment of sludge reduction, harmlessness, and resource utilization.

The project was accepted and appraised by the Shandong Provincial Department of Environmental Protection in the Eastern District of the Shandong Academy of Sciences on January 29, 2013. This result can improve the low-cost treatment and disposal capacity of sludge in China and promote the sound development of China's sewage treatment plant. Sludge disposal and recycling process. The use of sludge sludge for low-cost reduction and resource-based complete set of technologies and equipment will lead to a multi-billion-dollar industry scale for the utilization of sludge resources, which will result in significant energy-saving and emission-reduction effects, and will help promote recycling. The economic development, environmental benefits, social benefits and economic benefits are obvious, forming an application model suitable for the low-cost reduction of sludge disposal in China and the realization of comprehensive utilization. In addition, the successful application of two wet sludge treatment and disposal demonstration projects in Weifang 400t/day in Shandong Weifang and 330t/day in Laiwu through the “Low Cost Reduction of Municipal Sludge and Recycling Technology and Equipment” proves that the cost of municipal sludge is low The successful development of reduction and resource-based complete sets of technologies and equipment has important social implications for the cost reduction of sludge disposal in China, the reliance on similar foreign equipment, and the improvement of the comprehensive international competitiveness of domestic technology and equipment.

Hot Melt Adhesive For Book Spine

Book glue is mainly divided into back glue and side glue, the back glue is mainly milky white, and the side glue is mainly white transparent or light yellow transparent.

Company book glue properties.

In order to ensure the binding speed of books, different types of hot melt adhesives should be selected according to different machine speeds. Hot melt adhesives are divided into three types according to the binding speed: low speed binding hot melt adhesives (about 3600 copies/hour), medium speed binding hot melt adhesives (about 8000 copies/hour) and high speed binding hot melt adhesives (about 10000 copies/hour). The opening time and curing time of hot melt adhesive are closely related to the speed of binding. The opening time refers to the time between the hot melt adhesive and the other adhesive after the hot melt adhesive is applied to one adhesive. The opening time indicates that the two bonded objects must be bonded within the specified time, so as to ensure the bond strength. The opening time of the low-speed machine is 15 to 20 seconds, the medium-speed machine is 5 to 10 seconds, and the high-speed machine is 2 to 7 seconds. The curing time of hot melt adhesive refers to that after the cover and book block are bonded within the specified time, they can be turned and pressurized after a certain period of cooling, which is called the curing time. If the hot melt glue has not been cured, shaped and turned or cut, the back of the book will be deformed, and the hot melt glue will stick to the blade during cutting, affecting the quality of the product. When used, it should be reasonably selected according to the length of the conveyor belt, transmission speed, seasonal changes, etc. The curing time of hot melt adhesive is generally 3 to 5 minutes. 2) According to paper classification can be divided into coated paper and general paper with hot melt adhesive. The use of different types of paper, to choose the corresponding hot melt adhesive, because the paper surface finish, permeability, thermal conductivity is different. 3) According to the use of binding is classified into side glue and back glue. The hot melt adhesive used as side adhesive has good fluidity, low viscosity, long opening time and curing time, and high bonding strength. Book side glue requirements to achieve thin and uniform, bond firmly, in order to ensure the quality of the book and cutting requirements. You can't use two kinds of glue wrong. 4) According to the color of the glue classification In addition, if it is the same grade of product, yellow glue is better than white glue (but the manual generally requires the glue to be white). 302 series glue can meet the viscosity, hardness and color.

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Shenzhen Tongde New Materials Technology Co., Ltd. , https://www.tdhotmeltglue.com