Composite membrane

Industrialization of the composite membrane, solvent-free adhesives production units, brand is multifarious, different performance, such as universal, aluminum plating film solventless adhesives composite, boiled with solventless adhesives composite film, cooking with solventless adhesives film composite, such as using solventless adhesives but there are several common characteristics. ( 1) Does not contain solvents do not contain is an essential feature of the solventless adhesives. Because do not contain solvent adhesive, composite process, adhesive curing ( Chemical reaction) After all converted into solid matter, into composite products, composite process, no solvent emissions, solvent-free composite process, therefore, to save energy resources, environmental protection and fire control safety, and many other aspects, presents the prominent advantages. Solvent-free composite don't need to bake, heating, and make the evaporation of the solvent, emissions, not only save energy and also avoids the waste solvent, but also because there is no solvent volatilization emissions, no poisonous and harmful by-products produced, not on the production site and the surrounding environment, harm, become a kind of typical clean production technology, and energy saving is significant. ( 2) Low molecular weight does not contain any solvents, solvent-free adhesives in use process does not add to the adhesives solvent, so can not match into the solvent, the method of adjustment ( Reduce) Adhesive viscosity method, to improve the adhesive coating performance, meet on a substrate surface uniform coating and glue adhesion agent needs; Can improve the construction temperature, lower the adhesive viscosity get, coating processing, but with the increase of temperature, the application of the adhesive ( Coating construction time) Corresponding shortened, raise the temperature of the amplitude is limited by great, except outside the one-component solvent-free adhesives, generally the solventless adhesives coating temperature, must be controlled under 80 ℃. In order to keep the adhesive viscosity at a lower level, satisfy the need of coating construction, needs to be in when making adhesives, reduce the molecular weight of adhesive, in order to lower the viscosity of the adhesive, so the solventless adhesives is another common characteristics, adhesive molecular weight of the dry process significantly low molecular weight compound adhesives. Low molecular weight, meet the needs of the coating construction, but also because of the low molecular weight, easy to produce the base material layer ink penetration, migration, showing a poor compatibility with some printing ink, printing design variations. ( 3) Early low viscous force due to the molecular weight of solventless adhesives is generally low, so there is a common solventless adhesives, the characteristics of the composite processing, composite membrane at the beginning of the viscous force is low, in order to obtain good quality of composite products, requirements of solvent-free composite winding rolling device and equipment, has a good tension control system, in order to avoid composite membrane in winding when produce the ills such as tunnel effect, to ensure the quality of the products.