With the increasing cost of organic solvents and the increasing environmental protection requirements, organic solvent emissions are increasingly strict restrictions. Solventless lamination machine has advantages of health, safety, environmental protection, low cost and flexible packaging manufacturers will adopt solvent-free lamination technology instead of traditional solvent laminate technology for expanding laminating production capacity.
Why Choose Solventless Lamination Machine
The lamination machine adopting safety, healthy and environmentally friendly process is more and more required, which is the reason why solventless lamination machine is developed rapidly all over the world.
1.It adopts 100% adhesive, no solvent residue, reducing the pollution of packaging contents, especially food, drugs, etc. There is no volatile solvent emissions in the production, and there is no pollution on the atmospheric environment.
2. Higher running speed. The speed of the solventless laminating machine can be as high as 480m/min, with no risk for fire and explosion.
3. Less adhesive consumption. Solvent-free lamination machine has Lower production cost than solve machine. Gluing and total cost have a certain decrease.
4. The solventless laminator has lower energy consumption. Since the usual drying system is not adopted, energy consumption can be significantly reduced.
5. Better return on investment. The investment efficiency of the solventless machine is doubled than the solvent-based laminating machine.
6. Reduce the danger of storage for organic solvent transportation.
Working Principe Of Solventless Lamination Machine
The glue of the solvent-free laminating machine is AB glue. Currently, the laminating structure of thin layer laminating thick layer, aluminized lamination, aluminum foil laminating, paper-plastic lamination. There is no solvent and no need to worry about solvent residue. It is greatly affected by the air temperature. The glue operability is only about twenty minutes. So the tension control and the winding taper have high requirements.
Sheet-fed gravure press adopts paper stack continuous sheet feeding and the web-fed gravure press adopts continuous feeding with web paper. There’re three types of arrangement of plate cylinder and impression cylinder, including vertical, horizontally, inclined and the plate cylinder is arranged below the printing portion. Generally, each unit has a printing cylinder and an impression cylinder. In order to increase the printing pressure, some are equipped with 2 impression cylinders.
The technical advantage of the solventless lamination machine is very obvious, with low glue cost and high efficiency, through the step-by-step method of the sample, small batch production, mass production, reducing risks and unnecessary losses.
How To Control The Coating Weight Of Solventless Lamination Machine
1. The effect of coating clearance on coating weight
The coating clearance of solventless laminating machine on the coating weight is very obvious and the coating clearance is various due to different solventless lamination machine manufacturers.
The material of the metering roller and the transfer steel roller are affected by temperature.
Bearing clearance of the coating roller. Bearing clearance of the metering roller. Stability of metering roller under mechanical vibration.
2. The effect of temperature on coating weight
The glue used by the solventless machine is highly affected by temperature. With the different temperatures of solventless lamination glue, the fluidity and viscosity of glue will change greatly. At the same time, The phenomenon of heating expansion and cooling contraction occurs in the coating roller and metering roller with the temperature changing of the gluing, which affects the coating clearance.
3. The effect of transfer rubber roller on coating weight
The hardness, proper alignment, smoothness of the transfer rubber roller directly affects the coating weight.
The corrosion resistance of the transfer rubber roller directly affects the coating weight. The pressure on the transfer rubber roller directly affects the coating weight.
4.Effect of the coating mechanism rotating speed on the coating weight
The coating weight adjustment of the solventless laminating machine is to adjust the ratio of the coating roller and the transfer steel roller. So the linear speed stability of the coating roller and the transfer steel roller will greatly affect the coating weight.
What Are Important For The Use Of Solventless Lamination Machine
1.High control accuracy
The solvent-free machine requires high accuracy control because that the solventless glue substantially has no initial adhesion. There is a considerable high requirement for the soventless laminator tension control and high control accuracy for the coating unit.
2.High accurate production process
A solventless laminator requires precise control for the process settings such as operating temperature, tension match, and coating weight. For different product structures, different production processes are required.
3. High requirement for operator
A qualified operator of a solventless laminator needs good work responsibility and excellent operation skills.
4. Widely applicable structure
Early solvent-free lamination can only be applied to the composite of simple plastic to plastic. With the continuous improvement of the adhesive and the continuous maturity of the operating process, aluminizing film and some multi-layer structural products can also be produced. But for some highly rigid materials, there will be further developed.