Paper Lamination Technology-MEFU Lamination Guide

2024-02-21 16:41:34

Paper lamination is a widely used technology that involves bonding a thin plastic film to the surface of paper. The process enhances the durability, appearance, and strength of the paper, making it suitable for various applications such as packaging, book covers, and signage.MEFU is a leading supplier of laminating machines and finishing solutions, and to help users understand and utilize laminating technology effectively, we have provided a comprehensive guide.

Paper Lamination Technology

How does paper lamination work?

The MEFU Lamination Guide details the different types of lamination processes, including hot lamination, cold lamination, and heat-assisted lamination. Each type has its unique benefits and applications, and this guide helps users understand the differences between them and select the most appropriate lamination method for their specific needs.

The guide also covers various types of laminating films such as gloss, matt, and satin finishes, as well as different thickness options. Understanding the properties of each film is essential to achieving the desired lamination results.Commonly used in the lamination process are plastic films, which come in a variety of types such as polypropylene film (PP), polyvinyl chloride film (PVC), polyethylene film (PE), and polyester film (PET).

film

To meet the requirements of the use of lamination, plastic film should meet the following conditions:

1, the thickness of the film used for lamination is generally between 001 and 002 mm, and the appearance should be flat, with no unevenness, wrinkles, bubbles, shrinkage holes, pockmarks, or other blemishes.

2, used for lamination of plastic film after corona discharge treatment, the treatment surface effect should be uniform, the light transmission rate should be more than 90%, and the higher the transparency, the better, to ensure that the laminated prints have the best clarity. After the corona treatment of plastic film surface tension should meet the lamination requirements, and have better wetting and adhesive properties.

3, the film used for lamination should have good light resistance, chemical resistance, geometric stability, and a certain degree of mechanical strength properties to ensure that in the light for a long time under the irradiation is not easy to change, geometric stability, while ensuring that the plastic film and solvents, adhesives, inks, and other chemicals in contact with a certain degree of chemical stability.

4, most of the plastic films used for lamination are non-polar, low surface energy difficult to stick materials. In addition, due to the plastic film surface layer's poor cleanliness and other factors, the plastic film is difficult to laminate with the substrate's excellent adhesion, so the surface of the plastic film should be processed beforehand to make its surface clean, to enhance the adhesive on the surface of the plastic film wetting ability and adhesion ability.

control panel

Precautions for paper lamination?

Paper-plastic lamination is the comprehensive result of physical action of heat compression, lamination temperature, lamination pressure, and lamination speed are the basic conditions to achieve this physical synthesis. Correct handling of lamination temperature, lamination pressure, and lamination speed is essential to ensure the quality of lamination and bring a good operation interface for the next process.

1. Temperature control of lamination

The temperature of the laminating machine should not be too high or too low, generally controlled at about 50 to 60 degrees, the maximum should not exceed 120 degrees. The temperature is too low, and the solvent in the adhesive can not give full play, which will affect the fastness of the lamination, very easy to produce a bubbles shedding phenomenon. If the temperature is too high, many wrinkles will be produced on the surface after lamination. In the hot pressure under the laminated adhesive layer in a molten state, the molecular intensification of the number of molecules participating in the bonding increases, so that the plastic film, prints, and adhesive layer interface to achieve maximum adhesion.

The increase in lamination temperature contributes to the increase of adhesive strength, but it must be controlled within a reasonable range. That is, the coating film lamination temperature is generally controlled at about 80 to 90 degrees Celsius, and the pre-coated film lamination temperature is generally controlled at about 80 to 100 degrees Celsius. Too high a temperature, lamination will make the plastic film contract and deform, resulting in an unsatisfactory lamination effect.

2. Pressure control of lamination

Natural pressure: The MEFU rubber roller laminating machine is adjusted according to the state of natural pressure when the rubber roller is shipped from the factory, the natural pressure is the pressure generated by the self-weight of the upper rubber roller, such pressure is the most uniform when it acts on the material, and the laminating effect is also the best.

Artificial pressure: If the natural pressure can not meet the needs of lamination, then you can rotate the pressure adjusting nut to press down the pressure spring, the tighter the spring pressure, the greater the pressure of lamination.

3. Speed control of lamination

Lamination is in the conveyor belt drive under the state of motion, to complete the paper prints and plastic film laminated. Therefore, the conveyor speed of the laminating machine determines the length of time that the paper and plastic film laminating body stays on the working interface of the hot press.

When the lamination temperature and pressure are fixed, changes in the transfer speed of the laminator will change the effect of lamination. Laminate machine speed is too fast, paper prints and plastic film bonding are not firm, easy to produce fog; laminate machine speed is too slow, not only low production efficiency and the product is easy to blister.

Laminating speed determines the bonding time of plastic film and paper prints, and the working speed of the laminating machine should be reduced appropriately in the case of high paper weight, low working environment temperature, high humidity, and poor brightness of the paper prints being laminated.

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