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. Hot Melt Adhesive For Book Spine,Books Binding Hot Melt Glue,Books Binding Spine Glue,Books Binding Spine Adhesive Shenzhen Tongde New Materials Technology Co., Ltd. , https://www.tdhotmeltglue.com
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.
Ethylene market is full of enthusiasm
In 2007, the domestic price of ethylene oxide experienced a significant upward trend. Starting at 12,500 yuan per ton at the beginning of the year, it surged to 17,500 yuan by November, reaching an all-time high. The sharp increase of over 1,500 yuan in just one month drew widespread attention from industry observers. Despite a steady rise in production capacity and output in recent years, China still faces a growing demand for ethylene oxide driven by the rapid development of industries such as polyester and surfactants. As a result, the supply remains tight, and this imbalance is unlikely to be resolved in the short term.
One key factor contributing to the supply shortage is the mismatch between production capacity and actual output. Currently, there are 12 ethylene oxide production units operating in China, most of which are integrated with ethylene glycol production. In 2007, the total capacity reached 2.1 million tons. However, due to the co-production model, only about 33% of this capacity was actually used for ethylene oxide. This means that the real output was around 650,000 tons, which, although up by 500,000 tons from 2006, still failed to meet rising market demand.
Another challenge lies in the geographical concentration of production facilities. Most of China’s ethylene oxide capacity is located in Jiangsu, Zhejiang, and Shanghai. Major players like Nanjing Yangtze-BASF, Sinopec Yangzi Petrochemical, and Shanghai Petrochemical have large-scale installations, collectively accounting for nearly 58% of the national total. This concentrated layout makes the market vulnerable to regional fluctuations, and any disruption can send shockwaves across the entire domestic market.
Additionally, the physical properties of ethylene oxide—its low boiling point and high reactivity—make long-distance transportation risky. This limits the potential for imports to fill the supply gap, forcing the country to rely entirely on domestic production. Meanwhile, rising crude oil prices have pushed up production costs, further supporting the high prices of ethylene and its derivatives.
On the demand side, ethylene oxide is increasingly used in downstream sectors such as ethylene glycol, synthetic detergents, and specialty chemicals. The growth of the fine chemical industry has significantly expanded the market for ethylene oxide-based products. Applications range from household cleaning agents to industrial processes in petrochemicals, textiles, pharmaceuticals, and more. Demand for these specialized products has been growing at an annual rate of 10%, further straining the supply chain.
Moreover, the import of downstream products like ethylene glycol has surged, indicating a deepening supply-demand gap. In December, the spot price of imported ethylene glycol hit an unprecedented $1,700 per ton, with analysts predicting it could soon surpass $1,800. Since 2003, China has imported over 2.4 million tons of ethylene oxide-related products, highlighting the persistent imbalance in the market.
Industry experts emphasize that the domestic ethylene oxide market holds great potential but requires urgent development. They recommend accelerating the adoption of advanced foreign technologies, investing in large-scale ethylene oxide/ethylene glycol units, and promoting domestic innovation in reactor design and production infrastructure. These steps are essential to alleviate the supply pressure and support the continued growth of related industries.