The printing quality of the carton directly affects the overall quality of the carton, further affecting the overall image and quality of the contents. In the printing process of corrugated boxes, the printing quality is affected mainly by factors such as printing plates, printing inks, corrugated cardboard, equipment and operator adjustment techniques.
Printing plate
The material of the printing plate is commonly used in two types: rubber plate and resin plate. When using it, consider:
Hardness: The general plate hardness is suitable for around 35° Shore A, while the full plate printing plate should choose the material with low hardness (about 25° Shore A), and the printing plate with fine dots and fine words should have higher hardness. The material (approximately 45°~50° Shore A).
Release of ink: normal ink transfer should be maintained at more than 80%, the greater the ink transfer, the more conducive to improve the printing quality of the carton.
Elasticity: The printing plate with high elasticity and fast recovery of deformation is preferred for full-page printing; the printing plate with low elasticity and slow recovery for fine dots can better maintain the sharp edge of the printing plate.
Wear resistance and corrosion resistance: directly affect the life of the printing plate.
Thickness of the printing plate: In general, a printing plate with a thickness of 7 mm is often used. For the resin plate, in order to save the cost of the resin plate and reduce the plate thickness deformation caused by circular plate layout, the vast majority use 3.94mm resin plate, and 3mm thick cushion layer to make up the plate thickness specifications. Helps with platen and press buffers. The thickness of the printing plate should be consistent, and its tolerance is generally required to be within ±0.05mm. The difference between the height of the printing plate will cause uneven ink consumption, which will seriously affect the printing quality and efficiency. Therefore, when the printing plate material is inspected, it should be strict control. When the same color printing includes full and fine prints, except for the difference in the hardness of the printing plate, the thickness of the full-printed portion can be increased by 0.15 to 0.30 mm, which will facilitate the adjustment of the plate press and the press and improve the printing quality.
Printing ink
At present, most corrugated boxes manufacturers use water-based printing, and water-based inks mainly consist of additives such as pigments, flotation agents, and defoamers. Its main physical properties include:
Hue: The same number of ink should maintain the stability of its hue, so that in a different batch of printed products still maintain a certain printing color. When printing the first batch of products, the printing samples are generally collected for archiving so that the same product can be checked later.
Drying speed: The drying speed of the ink will affect the printing speed. Generally speaking, when the high-speed printing, the ink drying speed is ideal, but the drying speed is too fast will form a layer of film on the surface of the printing plate, affect the ink transfer, resulting in fine The gap between the words forms ink deposits and agglomerates to make the printing fuzzy, and the ink is not easy to preserve, and is prone to coagulation and deterioration.
Viscosity: The most suitable ink viscosity for water-based printing is between 17 and 25 seconds. The difference in viscosity will cause different printing depths. For the strict requirements on printing color, the ink viscosity must be stable within a certain range. Due to the volatility of the ink, the viscosity will gradually increase with the use of time. The operator should measure the viscosity about every 15 minutes and adjust the amount of water in a timely manner.
Corrugated cardboard
The flatness of the corrugated board and the ink absorption of the noodles affect the quality of the print. If the paper feeding process, due to the warpage of the corrugated cardboard, it will affect the smoothness of the paper feeding, resulting in large transmission errors and overprinting. The printing effect is not good, even unable to print.
Equipment and operator adjustment technology
Device precision and operator adjustment techniques are the most important factors in determining print quality. A finished high-quality corrugated box must have the precision of the processing position and the fineness of the printing. The processing positions include the printing position, the registration position, the overlapping position, the slotting position, and the flushing position. This not only requires high equipment precision, but also the operator must have an in-depth understanding of the equipment. The analysis of the causes of the bad can find the answer in time and correct and correct it. The operation of the printing press is the team's performance. Everyone should understand their own work and responsibilities, and have the tacit cooperation in order to maximize the processing quality and efficiency of the equipment.
Printing plate
The material of the printing plate is commonly used in two types: rubber plate and resin plate. When using it, consider:
Hardness: The general plate hardness is suitable for around 35° Shore A, while the full plate printing plate should choose the material with low hardness (about 25° Shore A), and the printing plate with fine dots and fine words should have higher hardness. The material (approximately 45°~50° Shore A).
Release of ink: normal ink transfer should be maintained at more than 80%, the greater the ink transfer, the more conducive to improve the printing quality of the carton.
Elasticity: The printing plate with high elasticity and fast recovery of deformation is preferred for full-page printing; the printing plate with low elasticity and slow recovery for fine dots can better maintain the sharp edge of the printing plate.
Wear resistance and corrosion resistance: directly affect the life of the printing plate.
Thickness of the printing plate: In general, a printing plate with a thickness of 7 mm is often used. For the resin plate, in order to save the cost of the resin plate and reduce the plate thickness deformation caused by circular plate layout, the vast majority use 3.94mm resin plate, and 3mm thick cushion layer to make up the plate thickness specifications. Helps with platen and press buffers. The thickness of the printing plate should be consistent, and its tolerance is generally required to be within ±0.05mm. The difference between the height of the printing plate will cause uneven ink consumption, which will seriously affect the printing quality and efficiency. Therefore, when the printing plate material is inspected, it should be strict control. When the same color printing includes full and fine prints, except for the difference in the hardness of the printing plate, the thickness of the full-printed portion can be increased by 0.15 to 0.30 mm, which will facilitate the adjustment of the plate press and the press and improve the printing quality.
Printing ink
At present, most corrugated boxes manufacturers use water-based printing, and water-based inks mainly consist of additives such as pigments, flotation agents, and defoamers. Its main physical properties include:
Hue: The same number of ink should maintain the stability of its hue, so that in a different batch of printed products still maintain a certain printing color. When printing the first batch of products, the printing samples are generally collected for archiving so that the same product can be checked later.
Drying speed: The drying speed of the ink will affect the printing speed. Generally speaking, when the high-speed printing, the ink drying speed is ideal, but the drying speed is too fast will form a layer of film on the surface of the printing plate, affect the ink transfer, resulting in fine The gap between the words forms ink deposits and agglomerates to make the printing fuzzy, and the ink is not easy to preserve, and is prone to coagulation and deterioration.
Viscosity: The most suitable ink viscosity for water-based printing is between 17 and 25 seconds. The difference in viscosity will cause different printing depths. For the strict requirements on printing color, the ink viscosity must be stable within a certain range. Due to the volatility of the ink, the viscosity will gradually increase with the use of time. The operator should measure the viscosity about every 15 minutes and adjust the amount of water in a timely manner.
Corrugated cardboard
The flatness of the corrugated board and the ink absorption of the noodles affect the quality of the print. If the paper feeding process, due to the warpage of the corrugated cardboard, it will affect the smoothness of the paper feeding, resulting in large transmission errors and overprinting. The printing effect is not good, even unable to print.
Equipment and operator adjustment technology
Device precision and operator adjustment techniques are the most important factors in determining print quality. A finished high-quality corrugated box must have the precision of the processing position and the fineness of the printing. The processing positions include the printing position, the registration position, the overlapping position, the slotting position, and the flushing position. This not only requires high equipment precision, but also the operator must have an in-depth understanding of the equipment. The analysis of the causes of the bad can find the answer in time and correct and correct it. The operation of the printing press is the team's performance. Everyone should understand their own work and responsibilities, and have the tacit cooperation in order to maximize the processing quality and efficiency of the equipment.
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