Failure of 4 rolls of easy-to-repeat end paper after glue penetration, unable to unwind Printing reasons: When rewinding a small roll, the rewinding tension is too large, resulting in rewinding too tight and causing this failure; storage or printing workshop temperature is too high This failure was caused; being squeezed or having a long storage time was one of the causes of this failure.
The solution to the problem is:
1, in addition to the above reasons to improve the corresponding storage and processing conditions, the alcohol can also be used to wipe the infiltration of the adhesive surface, so that the adhesive dilution, reduce its viscosity, in order to facilitate the decoiling;
2. Unscrew it gently, put powder on both ends and rewind slowly;
3. The improved roll adhesive material should be slow-printed and die-cut on a batch-feed label machine.
Failure 5 Partially dropped ink on the surface of the printed film—Inconsistent adhesion of the ink Cause: When a multi-color overprint occurs, the underlying ink is not completely dry and is covered by the surface ink. Second, the ink layer is too thick to cause exposure. The same color ink has been completely dry, and the ink under the pressure is still not dry; Third, the monochromatic UV curing function;
The solution is:
1, reduce the thickness of the ink layer;
2. Increase the curing power of the VU drying device;
3, reduce the speed of the machine, increase the ink curing time, can use monochrome multi-station curing;
4, in the process design to avoid the ink stack printing as much as possible, the edge of the graphics can be used to color parallel printing process;
5, increase the power of the corona treatment device, improve the surface tension of the substrate, make the ink easier to dry, thereby increasing the adhesion of the ink;
6. Use a fast curing ink or add a photosensitizer (desiccant) to the ink.
Fault 6 Field printing Fish eye surface Cause: Fish eyes are caused by paper, paper dust or dust. Fish eyes are not only related to the degree of cleanliness of the environment and the sealing of the workshop, but also related to static electricity, because static electricity will adsorb impurities such as dust and paper dust on the surface of printing materials; the appearance of fish eyes and the quality of printing materials themselves are magnetic, and density Non-uniformity, low coating firmness, and low fiber-tolerance substrates tend to cause fish-eye problems; in addition, the printing materials with poor slitting quality and low slitting accuracy are prone to fish-eye problems.
The solution to the problem is:
1. Improve and purify the production environment. Conditional printing manufacturers should deal with the sealing management of printing machines;
2. Install a static eliminator and printing material cleaner on the printing machine to prevent dust and paper debris from being left on the surface of the printing material;
3, the use of high-quality printing materials, requires its surface coating to have a strong degree of stability, not easy to fall;
4. Improve the slitting quality of reel material to prevent chipping on the end face or periphery of the material;
5. Regularly clean the ink system of printing plates and printing machines;
Failure 7 paper material powder reason: the quality of the paper itself is poor, the surface coating is low, it is easy to drop powder; environmental humidity or the material itself, the substrate coating material strength is reduced or the viscosity of the ink is too easy to cause powder off Failure; In addition, the powder off is also related to the press side of the label.
The solution to the problem is:
1. Use high-quality printing materials, especially when printing on a large area;
2. To reduce the viscosity of the ink, it is required that the viscosity of the printing ink used in each color sequence be successively reduced;
3, to improve the material storage environment and printing environment, reduce the environmental humidity;
4, in the process design on the ground to print flat screen printing;
5, before the formal printing, take blank paper to preprint, you can remove the floating powder;
6, change the printing equipment imprinting method, reduce the printing contact area.
Failure 8 Single Printing Overprinting Inaccuracy Cause: (1) Overprinting due to unstable paper size is not allowed.
Because the paper processing environment is different from the environment humidity of the composite manufacturing, the paper size changes; the moisture content of the paper surface is uneven, resulting in deformation of the paper on the four sides or local deformation; in the same size paper, due to the inconsistent fiber orientation of some papers, The shrinkage rate is different, while the unstable temperature and humidity in the workshop can cause a large change in paper size.
The solution to the problem is:
1. Gradually control the printing shop at 20-22 degrees Celsius, and control the relative humidity at 50%.
2. Control the use of fountain solution at the lowest level to reduce the paper's draw up and deformation;
3, try to use a multi-color printing machine to complete multi-color printing;
4, using a monochrome machine to print a number of semi-finished products to be protected, it is best sealed with plastic sheets, especially in the rainy season;
5, the use of fiber in the same direction of the paper, different fiber direction of the paper to be stacked separately, printing;
6. When the conditions permit, the paper should enter the printing workshop in advance, so that it has sufficient time to balance with the ambient temperature and humidity.
7. For paper with excessive humidity, a method of pre-air printing can be adopted to speed up the balance between temperature and humidity on the environment;
8. For small labels that require bronzing and die-cutting, they should be printed first. After the dimensions are stable, the bronzing plate and die-cut plate are made with reference to the actual size. (To be continued)
The solution to the problem is:
1, in addition to the above reasons to improve the corresponding storage and processing conditions, the alcohol can also be used to wipe the infiltration of the adhesive surface, so that the adhesive dilution, reduce its viscosity, in order to facilitate the decoiling;
2. Unscrew it gently, put powder on both ends and rewind slowly;
3. The improved roll adhesive material should be slow-printed and die-cut on a batch-feed label machine.
Failure 5 Partially dropped ink on the surface of the printed film—Inconsistent adhesion of the ink Cause: When a multi-color overprint occurs, the underlying ink is not completely dry and is covered by the surface ink. Second, the ink layer is too thick to cause exposure. The same color ink has been completely dry, and the ink under the pressure is still not dry; Third, the monochromatic UV curing function;
The solution is:
1, reduce the thickness of the ink layer;
2. Increase the curing power of the VU drying device;
3, reduce the speed of the machine, increase the ink curing time, can use monochrome multi-station curing;
4, in the process design to avoid the ink stack printing as much as possible, the edge of the graphics can be used to color parallel printing process;
5, increase the power of the corona treatment device, improve the surface tension of the substrate, make the ink easier to dry, thereby increasing the adhesion of the ink;
6. Use a fast curing ink or add a photosensitizer (desiccant) to the ink.
Fault 6 Field printing Fish eye surface Cause: Fish eyes are caused by paper, paper dust or dust. Fish eyes are not only related to the degree of cleanliness of the environment and the sealing of the workshop, but also related to static electricity, because static electricity will adsorb impurities such as dust and paper dust on the surface of printing materials; the appearance of fish eyes and the quality of printing materials themselves are magnetic, and density Non-uniformity, low coating firmness, and low fiber-tolerance substrates tend to cause fish-eye problems; in addition, the printing materials with poor slitting quality and low slitting accuracy are prone to fish-eye problems.
The solution to the problem is:
1. Improve and purify the production environment. Conditional printing manufacturers should deal with the sealing management of printing machines;
2. Install a static eliminator and printing material cleaner on the printing machine to prevent dust and paper debris from being left on the surface of the printing material;
3, the use of high-quality printing materials, requires its surface coating to have a strong degree of stability, not easy to fall;
4. Improve the slitting quality of reel material to prevent chipping on the end face or periphery of the material;
5. Regularly clean the ink system of printing plates and printing machines;
Failure 7 paper material powder reason: the quality of the paper itself is poor, the surface coating is low, it is easy to drop powder; environmental humidity or the material itself, the substrate coating material strength is reduced or the viscosity of the ink is too easy to cause powder off Failure; In addition, the powder off is also related to the press side of the label.
The solution to the problem is:
1. Use high-quality printing materials, especially when printing on a large area;
2. To reduce the viscosity of the ink, it is required that the viscosity of the printing ink used in each color sequence be successively reduced;
3, to improve the material storage environment and printing environment, reduce the environmental humidity;
4, in the process design on the ground to print flat screen printing;
5, before the formal printing, take blank paper to preprint, you can remove the floating powder;
6, change the printing equipment imprinting method, reduce the printing contact area.
Failure 8 Single Printing Overprinting Inaccuracy Cause: (1) Overprinting due to unstable paper size is not allowed.
Because the paper processing environment is different from the environment humidity of the composite manufacturing, the paper size changes; the moisture content of the paper surface is uneven, resulting in deformation of the paper on the four sides or local deformation; in the same size paper, due to the inconsistent fiber orientation of some papers, The shrinkage rate is different, while the unstable temperature and humidity in the workshop can cause a large change in paper size.
The solution to the problem is:
1. Gradually control the printing shop at 20-22 degrees Celsius, and control the relative humidity at 50%.
2. Control the use of fountain solution at the lowest level to reduce the paper's draw up and deformation;
3, try to use a multi-color printing machine to complete multi-color printing;
4, using a monochrome machine to print a number of semi-finished products to be protected, it is best sealed with plastic sheets, especially in the rainy season;
5, the use of fiber in the same direction of the paper, different fiber direction of the paper to be stacked separately, printing;
6. When the conditions permit, the paper should enter the printing workshop in advance, so that it has sufficient time to balance with the ambient temperature and humidity.
7. For paper with excessive humidity, a method of pre-air printing can be adopted to speed up the balance between temperature and humidity on the environment;
8. For small labels that require bronzing and die-cutting, they should be printed first. After the dimensions are stable, the bronzing plate and die-cut plate are made with reference to the actual size. (To be continued)
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