Advantages of solvent-free polyurethane adhesive compound

Solvent-free Polyurethane Adhesive composite does not require a drying process, can save a lot of energy; Second,

The adhesive amount per unit area of solvent-free polyurethane adhesive composite is only 40% of the adhesive amount per unit area of solvent-based composite, although the cost of solvent-free Composite Adhesive is higher, but its comprehensive cost can be reduced

30% to 40%.

Safety and environmental protection

Because solvent-free polyurethane adhesive avoids a large amount of solvent into the air and pollution to the environment, the production environment can be greatly improved, more conducive to clean production; Workers do not use flammable and explosive organic solvents in the production process, thus avoiding fire hazards, safety is good, there is no residual solvent in the composite film, and the product is more healthy.

High product quality

Using solvent-free polyurethane adhesive composite film, the film composite, the product health reliability is good; The composite substrate will not be deformed by the heating of solvent and drying channel, which is conducive to the flatness of the film. When using solvent-free composite, the printing surface ink will not cause quality problems because of the solvent in the adhesive; The insoluble compound equipment generally has an online corona treatment unit, which has a good compound performance for thin films with reduced surface tension and high lubricant content. For special products such as polyester film (PET)/ paper/aluminum foil (Al),

Copolymer film (EVA)/ paper /AI etc are more suitable.

High production line speed

The normal linear speed of solvent-free polyurethane adhesive composite is 300 ~ 350 m/min, and the maximum linear speed can be as high as 450 m/min, and the composite speed is fast and the equipment production efficiency is high.

In the field of composite flexible packaging, solvent-free polyurethane adhesives not only show obvious advantages in environmental protection, safe production, product quality improvement, production efficiency, but also in reducing production costs and improving economic benefits.

Of course, any process can not be perfect, solvent-free polyurethane adhesive also has its own shortcomings, mainly: Because there is no solvent dilution, in order to facilitate coating, the relative molecular weight of solvent-free polyurethane adhesives is usually much lower than that of solvent-based polyurethane adhesives (usually in the hundreds of thousands to hundreds of thousands), basically below 10,000, resulting in lower initial adhesion and higher composite tension requirements. And for the composite difficult materials such as PET/AI, PETNMPET, it is necessary to choose an adhesive with good initial adhesion and accurate tension control; Second, because there is no solvent cleaning effect, the surface tension of the substrate is more stringent.