There are a wide variety of adhesives with different properties. From the composition, about 80% of the adhesives are made of polymer materials as the main raw material. There are many ways to classify adhesives, according to its use, adhesives can be divided into: pre-bonding of parts with adhesives and the whole package or parts of formal bonding with adhesives. According to the different raw materials adhesives can be divided into three categories, namely, animal adhesives, plant adhesives and synthetic adhesives.
The most common method of classification of adhesives when the composition of the adhesive classification, can be divided into organic adhesives and inorganic adhesives two categories. Among them, organic adhesives can be divided into natural polymer adhesives and synthetic polymer adhesives, natural polymer adhesives are from the natural growth of plants and animals in nature, can also be subdivided into animal adhesives and plant adhesives. Natural polymer adhesives are from the natural growth of plants and animals in nature, can also be subdivided into animal adhesives and plant adhesives.
Synthetic polymer adhesives are divided into three categories: the first category is a synthetic rubber class, the main varieties of neoprene, silicone rubber, etc.; the second category is a synthetic resin class, the main varieties of epoxy resin, phenolic resin, polyvinyl acetate and other resin adhesives; the third category is a mixture of resin and rubber, the main varieties of phenolic chloroprene adhesives.
At present in the production of bags, natural rubber adhesives are most used, natural rubber adhesives to gasoline as a solvent, so usually also known as gasoline glue, this adhesive toxicity is weak, volatile fast, the product's sticky dirt small, and inexpensive, easy to use, but its bonding ability is weak, can only be used for temporary bonding, generally used for lining, zippers and those bonding after the line fixed parts. Another application of more adhesive is neoprene adhesive, this adhesive viscosity, solvent evaporates quickly, suitable for permanent bonding parts, but its solvent contains benzene or toluene, with a certain degree of toxicity, not only harmful to humans, and its vapor mixed with air is easy to form explosive mixtures, use to pay attention to ventilation and fire, to prevent poisoning.
In the production of solid double-sided tape to replace part of the liquid adhesive, to a certain extent, to improve labor productivity and reduce the degree of environmental pollution. At present, China has developed a low toxicity adhesive, I believe that in the near future will be used in the production of bags.
