The water-based film is an effective method for processing the surface of the printed matter to improve the surface gloss, strength, aesthetic effect, temperature resistance, water resistance, and abrasion resistance of the printed matter and improve the quality of the printed material and the quality of the printed product. Therefore, the quality of the coated film is evaluated. Also need to examine the film brightness, strength, adhesion and other aspects.
Yutian Shengtian's development of water-based film coating has made the water-based film coating technology widely promoted. The water-based wet test film has been favored by customers because of its high strength, high grade, easy recycling, and no pollution.
When the water-based laminating process was just promoted, due to the customer's lack of understanding of the process, concerns, and fear of problems, in view of this, had done a lot of trials beforehand for customers, such as: Hubei Xinhua printing factory, in order to test the water-based print After the film's resistance to temperature, moisture, and oil, the relevant coating test was performed at the initial stage of machine use. No matter the temperature, humidity, or oil resistance, the film product requirements can be achieved. (See the specific test procedure, contents and results. "Printing Technology", No. 9, 1999, pp. 58-59).
The lamination process is more complicated and the following points need to be noted in normal production:
First, the printed product powder because the water-based glue can dissolve the surface of the print powder, so when the film products appear snow, it felt incomprehensible. In fact, the reason is very simple, water-based glue itself also has a solubility limit, if the print dusting is too large, the excess part can not be completely dissolved by the glue, there will be a large area of ​​snow.
There are three ways to solve this situation:
1. Coordinate the process up and down, minimize the amount of dusting during printing;
2. Appropriately increase the amount of glue to increase the ability of glue to dissolve and spray powder;
3. Before the film is coated, the surface of the print is suspended and cleaned.
Second, cleaning As the water-based film glue dries quickly, if it does not flow at rest, it will dry into rubber and become a solid block. If it is attached to the coating roller or the pressure roller, it will cause the local glue to be too small or the local pressure will be too large when the pressure is applied. Therefore, in the film coating process, the adhesive coating roller and the pressure roller should be kept clean.
If there is too much dust in the surrounding environment or there is dry rubber in the glue and the film fragments are cut off, the coated product will have snow, so Beijing and Tianjin pay attention to environmental sanitation, glue should be used up and should be poured back into the plastic barrel to seal, or take Filtration method before gluing.
Third, the color change of printed products is mainly reflected in the large area of ​​printing gold and bronzing products. This is due to chemical reactions between the chemically active elements of the glue and the gold powder.
The solution is: for gold products using special gold ink or special glue, or change the process, hot foil stamping after the first hot film, many manufacturers use this process, the effect is very good.
Fourth, paper and plastic off this phenomenon is easy to appear in the full version of printed matter, due to the thicker surface ink layer, pleural effusion is difficult to wet, diffusion, penetration, resulting in poor adhesion.
The solution is:
1. For such products, glue manufacturers are required to increase the solid content of the glue;
2. Appropriately increase the thickness of the glue layer;
3. Increase the ambient temperature during film coating and product drying;
4. Check the glue, check the date of manufacture and shelf life of the glue;
5. Whether the film is beyond the shelf life, check whether the corona treatment of the film fails.
Fifth, the deformation occurs in this case for the following reasons:
1. Too much glue. Because the glue is bound to make the paper absorb moisture, any paper will deform when it absorbs a lot of water. So, in the absence of snow spots, try to reduce the amount of glue;
2. Coated film is severely deformed. At this point, the tension of the film should be properly adjusted, as long as the film can be very smooth and fit with the paper, the smaller the tension, the better;
3. Winding tension is too high. After ensuring that the product will be rolled onto the roll after lamination, the smaller the rolling force, the better;
4. The temperature difference and the humidity difference of the external environment of the film are too large.
At present, there is also a kind of glue between the oiliness and the water in the country. The price is very cheap. It does not need to be dried and dried naturally after coating. The brightness and flatness of the product can meet the requirements, but it has strong Irritating odor, unstable quality. Can be used for low-end products, high-end products recommended by the regular manufacturers of white green glue.
With the rapid development of the printing and packaging industry, waterborne coatings will have a broader perspective. (Ye Liming, author of Tangshan Shengtian Printing and Packaging Machinery Co., Ltd.) (From "China Packaging Industry" 2001 12)
Yutian Shengtian's development of water-based film coating has made the water-based film coating technology widely promoted. The water-based wet test film has been favored by customers because of its high strength, high grade, easy recycling, and no pollution.
When the water-based laminating process was just promoted, due to the customer's lack of understanding of the process, concerns, and fear of problems, in view of this, had done a lot of trials beforehand for customers, such as: Hubei Xinhua printing factory, in order to test the water-based print After the film's resistance to temperature, moisture, and oil, the relevant coating test was performed at the initial stage of machine use. No matter the temperature, humidity, or oil resistance, the film product requirements can be achieved. (See the specific test procedure, contents and results. "Printing Technology", No. 9, 1999, pp. 58-59).
The lamination process is more complicated and the following points need to be noted in normal production:
First, the printed product powder because the water-based glue can dissolve the surface of the print powder, so when the film products appear snow, it felt incomprehensible. In fact, the reason is very simple, water-based glue itself also has a solubility limit, if the print dusting is too large, the excess part can not be completely dissolved by the glue, there will be a large area of ​​snow.
There are three ways to solve this situation:
1. Coordinate the process up and down, minimize the amount of dusting during printing;
2. Appropriately increase the amount of glue to increase the ability of glue to dissolve and spray powder;
3. Before the film is coated, the surface of the print is suspended and cleaned.
Second, cleaning As the water-based film glue dries quickly, if it does not flow at rest, it will dry into rubber and become a solid block. If it is attached to the coating roller or the pressure roller, it will cause the local glue to be too small or the local pressure will be too large when the pressure is applied. Therefore, in the film coating process, the adhesive coating roller and the pressure roller should be kept clean.
If there is too much dust in the surrounding environment or there is dry rubber in the glue and the film fragments are cut off, the coated product will have snow, so Beijing and Tianjin pay attention to environmental sanitation, glue should be used up and should be poured back into the plastic barrel to seal, or take Filtration method before gluing.
Third, the color change of printed products is mainly reflected in the large area of ​​printing gold and bronzing products. This is due to chemical reactions between the chemically active elements of the glue and the gold powder.
The solution is: for gold products using special gold ink or special glue, or change the process, hot foil stamping after the first hot film, many manufacturers use this process, the effect is very good.
Fourth, paper and plastic off this phenomenon is easy to appear in the full version of printed matter, due to the thicker surface ink layer, pleural effusion is difficult to wet, diffusion, penetration, resulting in poor adhesion.
The solution is:
1. For such products, glue manufacturers are required to increase the solid content of the glue;
2. Appropriately increase the thickness of the glue layer;
3. Increase the ambient temperature during film coating and product drying;
4. Check the glue, check the date of manufacture and shelf life of the glue;
5. Whether the film is beyond the shelf life, check whether the corona treatment of the film fails.
Fifth, the deformation occurs in this case for the following reasons:
1. Too much glue. Because the glue is bound to make the paper absorb moisture, any paper will deform when it absorbs a lot of water. So, in the absence of snow spots, try to reduce the amount of glue;
2. Coated film is severely deformed. At this point, the tension of the film should be properly adjusted, as long as the film can be very smooth and fit with the paper, the smaller the tension, the better;
3. Winding tension is too high. After ensuring that the product will be rolled onto the roll after lamination, the smaller the rolling force, the better;
4. The temperature difference and the humidity difference of the external environment of the film are too large.
At present, there is also a kind of glue between the oiliness and the water in the country. The price is very cheap. It does not need to be dried and dried naturally after coating. The brightness and flatness of the product can meet the requirements, but it has strong Irritating odor, unstable quality. Can be used for low-end products, high-end products recommended by the regular manufacturers of white green glue.
With the rapid development of the printing and packaging industry, waterborne coatings will have a broader perspective. (Ye Liming, author of Tangshan Shengtian Printing and Packaging Machinery Co., Ltd.) (From "China Packaging Industry" 2001 12)
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