Classification of PUR hot melt adhesive
PUR hot melt adhesive is an intellectual structure design containing different polarity and chemical reactivity of urethane or isocyanate groups, and containing bioactive hydrogen materials, such as wood, leather, fabric, paper, ceramics and other porous building materials and plastic, metal, glass, rubber and other surface to form a smooth material development has excellent adhesion.
PUR hot melt adhesiveMachine (polyurethane reactive) Chinese called polyurethane hot melt adhesive. Its main component is isocyanate-terminated polyurethane prepolymer. The adhesion and toughness (elasticity) of polyurethane are adjustable, and it has excellent adhesive strength, temperature resistance, chemical corrosion resistance and aging resistance. It has become one of the important parts of the adhesive industry. It has been widely used in product packaging, wood processing, automobile, textile, mechanical and electrical, aerospace and other fields of national social and economic development.
PUR hot melt adhesive is an intellectual structure design containing different polarity and chemical reactivity of urethane or isocyanate groups, and containing bioactive hydrogen materials, such as wood, leather, fabric, paper, ceramics and other porous building materials and plastic, metal, glass, rubber and other surface to form a smooth material development has excellent adhesion. From the way of glue supply, there are two kinds of air pump and gear pump. From the smelting way: there are two kinds, smelting cylinder type and pressure plate type.
Melting cylinder type: The heating part is a thick-walled cylinder, generally made of aluminum alloy. Heat and melt a small package of gel (colloid). There is a lid on the cylinder. This type of machine is often used on small rubber machines and has always been rare.
The pressure plate and the heating part are aluminum alloy heating plates. When the heating plate is used from top to bottom, a plastic barrel is used. The heating plate is located above the glue surface. When the heating plate is heated, a layer of glue surface just above contacts the heating plate and melts to the melting point. The edge of the glue barrel is heated. How much is needed for part of the production and how much is melted, so as to avoid aging and deterioration of glue for long heating time.
When melting, the glue is isolated from the air: the heating plate and the inner wall of the glue barrel are sealed with an O-ring, so that the melted liquid glue does not come into contact with the ambient air, thus ensuring the requirements of the operating technical conditions of the PUR hot melt glue machine. The pressing plate can be made of aluminum alloy precision casting, CNC precision product processing, and the surface of the heated plate is processed by DuPont Teflon deep learning penetration sintering technology, which has the advantages of high strength and not easy to fall off of different coating materials. The gluing is easy to remove, which can effectively prevent the glue from burning, ensure good gluing, and reduce the blockage of the glue feeding system.
With the overall progress of China's printing technology, the pre-press and post-press technology is developing in a higher, faster and finer direction, especially the binding technology that has been stagnant for more than ten years has also developed rapidly. Binding link is a process in the process of book production and molding development. The quality of processed products in this process is the key to affect the quality of books and periodicals and the overall teaching effect. In the binding process, binding glue is the key to ensure the quality of books and periodicals in the binding process.
PUR hot melt adhesive machine is composed of adhesive molecules and the air and water molecules in the book core to form an irreversible adhesive curing structure, thus forming a more stable and lasting adhesive layer to ensure the quality of binding.
After more than 20 years of development, PUR hot melt adhesive machine has achieved rapid development in Europe and the United States, especially high-end books and magazines use PUR hot melt adhesive machine. Some countries in South America also clearly stipulate that textbooks must be bound with PUR hot melt glue machine. Thus, the use of PUR hot melt adhesive machine binding is a trend in the future development of binding. PUR hot melt adhesive machine is specially designed to adapt to the social various ways of different grams of printed electronic paper, plastic packaging film surface varnish and ink materials designed.
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