The ways to laminate the film

The coating process can be divided into cold (cold pressure) coating, hot (heating) coating and liquid coating according to the heat, pressure and material. Thermal coating technology refers to heating and pre-coating the adhesive on the diaphragm, through which the film is bonded to the printed product; while the cold coating is pressed, directly bonding the film to the printed product by the adhesive. Together. Both methods can produce various special films such as UV protective film, waterproof or anti-friction film. Recently, there has also been a new technology called "liquid film". Simply use a brush, spray gun, roller or special laminator to apply a film directly on the surface of the product. Although the technical operation is simple and the price is low, it is still not mature.

Small laminating machine laminating process. This type of small laminator was developed to meet the needs of low-to-medium consumers.【Automatic Laminator】This kind of small laminating machine solves the fundamental problem of the ordinary laminating machine. The price of the laminating machine is between 1400 and 1500 yuan. Since the film is pressed by the inner hot rubber roller, the film is heated up and down, which increases the heating time of the precoating film, and It is heated and balanced, so the film that is covered is smooth and bright, and it has the same effect as the film coated by the high-grade laminating machine. Only such a small laminating machine has a heating power of only 500 W. Although the temperature is adjustable, the speed is fixed, and the film can be pressed 0.7-0.8 m per minute. Suitable for business card lamination, recipe film, photo film and graphic print film, especially for small printing houses, typing and copying shops, business card production companies and photo studios.【Film Lamination Machine】In order to reduce equipment investment and reduce costs, this type of film is used. There are more machines.At present, the market prospects of such small laminating machines are very good. Many customers who used to use them have later started sales of such laminating machines, and the sales volume is also good. It can be said that this small laminating machine is the most cost-effective. It is easy to use and has obvious effects. It solves the needs of some small end customers and has a great promotion value.

Problems probably occurred during lamination process

Blistering

1. The printed ink layer is not dry. It should be hot pressed and then glued; delay the filming time and make it dry thoroughly.
2. The printed ink layer is too thick. The amount of adhesive applied should be increased to increase the pressure and compound temperature.
3. The drying temperature is too high and the surface of the adhesive is crusted. Should reduce the drying temperature
4. The surface temperature of the composite roll is too high. The composite roll temperature should be lowered.
5. The film has wrinkles or slack, and the film is uneven or curled. [ Lamination Machine Manufacturer ] The film should be replaced and the tension adjusted.
6. There are dust impurities on the surface of the film. It should be cleared in time.
7. The adhesive coating is uneven and the dosage is small. The amount of coating and uniformity should be increased.
8. The binder concentration is too high, the viscosity is large, and the coating is uneven. Apply a diluent to reduce the binder concentration.


Wrinkles

1. The film transfer roller is unbalanced. The transfer stick should be adjusted.
2. The ends of the film are inconsistent or wavy. [ Film Lamination Machine ] The qualified film should be replaced.
3. The glue layer is too thick, the solvent evaporation is not thorough, affecting the viscosity, squeezed by the pressure roller, and slippage between the paper and the film. The amount of glue should be adjusted to increase the temperature of the drying tunnel.
4. The electric heating roller and the rubber roller are unbalanced at both ends, the pressure is inconsistent, and the line speed is not equal. The two rollers should be adjusted.

Classification of Film Lamination

Coating film
That is, when the coating film process is performed, the adhesive is applied to the film, and then hot pressed.
This is also the current popular processing method.


Pre-coated film
This process greatly simplifies lamination because the laminating equipment does not require a binder to heat the drying system.
The program is very convenient to operate, can be used with the start-up, has great production flexibility, no solvent smell, no environmental pollution, more importantly, it can completely avoid bubbles, delamination and other faults, and its finished product has high transparency and wide application prospects and promotional value. [ water based lamination machine ]
The pre-coated film structure is composed of a substrate and a glue layer. The substrate is usually a PET film and a BOPP film. From the viewpoint of material cost and processing technology, most of the pre-coated film substrates are made of BOPP film and have a thickness of 12-20 micrometers. The thickness is 5-15 microns. According to different processing equipment and process conditions, different thicknesses of glue layer are selected, and the glue layer is divided into hot melt adhesive and organic polymer low temperature resin plate. [ film lamination machine ] The difference between the two is that the hot melt adhesive is made by blending and modifying several materials of the main adhesive resin, the tackifier and the modifier, and the organic polymer resin is a single polymer low temperature copolymer.
Due to limitations in technology, production equipment, and raw materials, pre-coated films (mostly hot melt adhesives) produced by domestic equipment still have quality defects. Since the production process is a process similar to that of the coating film, the colloid is dissolved in an organic solvent, and the rubber is roll coated on the substrate film by a concave anilox roll, so that the solvent volatilization is insufficient, and the odor is generated during operation. After the film is coated, the solvent evaporates and the surface is easy to foam. At the same time, since the hot melt adhesive is blended by several kinds of polymer materials, the temperature control is not good, which will cause degradation and cross-linking of the high molecular polymer in the hot melt adhesive, and the surface of the film is poor.[ lamination machine manufacturer ]Some pre-coated film colloids easily adhere to the outer surface of the substrate, resulting in poor winding. Since the adhesive layer is thin and the surface is not activated, defects such as insufficient adhesion to the printed matter are likely to occur. Since the hot melt adhesive is composed of several kinds of materials, the transparency after coating is significantly worse than that of the low temperature pure resin type pre-coated film.


Water-based coating
It is a method of processing the surface of printed products to improve the gloss, strength and aesthetic effect of the surface of the printed products. To measure the quality of the film, it is also necessary to examine its brightness, strength, and adhesion. The water-based wet film is favored by customers because of its high strength, easy recycling and non-polluting properties.


Curved film
It is a new transfer technology that can cope with complex workpieces and is suitable for different materials. It also greatly increases the added value of products due to vivid patterns and vivid colors. This technology is a special chemical treatment film, after printing a certain color pattern, it is sent to the surface of the water, using water pressure to write the pattern evenly on the surface of the product, while the coated film is automatically dissolved, washed and baked. After drying, a layer of transparent protective coating is applied, and the product has a completely different visual effect.
The coating process can be divided into cold (cold pressure) coating, hot (heating) coating and liquid coating according to the heat, pressure and material.[ automatic lamination machine ] Thermal coating technology refers to heating and pre-coating the adhesive on the diaphragm, through which the film is bonded to the printed product; while the cold coating is pressed, directly bonding the film to the printed product by the adhesive. Together. Both methods can produce various special films such as UV protective film, waterproof or anti-friction film. Recently, there has also been a new technology called "liquid film". Simply use a brush, a net gun, a roller or a special laminator to apply a film directly on the surface of the product. Although the technical operation is simple and the price is low, it is still not mature.