The quality of the carton printing plate is the key that directly affects the carton printing quality. Paying attention to the quality of the related links can improve the printing quality, extend the life of the printing plate, reduce the loss of the printing plate, and reduce the production cost.
1. Reasonable use of plates
In the printing production of corrugated boxes, commonly used carton printing plates are mainly rubber plates and flexographic resin plates.
The rubber plate has lower cost and larger printing volume than the flexographic resin plate, but the printing accuracy is poor and the efficiency is low;
Complex patterns, fine text (such as barcodes, web graphics and small fonts) and large-area full-page solid printing need to be completed with resin plates;
High screen printing, and large printing volume, using laser flat screen printing plate is durable, because flat screen printing, the dot angle is vertical, increasing the number of times of printing.
2. The quality of flexo resin plate
Corrugated cardboard has irregularities, roughness, cardboard warpage, dusting and fluffing on the printing surface, sand particles in the paper, etc. These defects are easy to cause the printing plate to paste, crush, even wear or damage the soft during the printing process. Printing resin plates causes the life of the printing plates to be shortened.
Flexographic resin plates generally use plates with a thickness of 3.94mm and a Shore hardness of 33-36. The printing plate is required to be wear-resistant, strong impact resistance, moderate hardness, good resilience after compression, uniform inking, uniform thickness, and according to the size of the pattern, text, and line.
Other materials (double-sided adhesive tape, water-free tape): When using double-sided adhesive tape and water-free tape to paste the resin plate to the polyester film, if it is found that the adhesion is not strong, it must not be used to prevent the resin plate from In the case of sticking, the pressure and impact force during printing can not withstand the printing plate to spring open, causing the printing plate to be crushed or lost.
It is recommended to use silicon-based defoamers for defoamers in inks, not hydrocarbon defoamers. Because hydrocarbon-based defoamers can cause swelling of flexographic resin plates (n-butanol used for plate washing after flexographic plate exposure is hydrocarbon), crack the printing plate and accelerate the damage of the printing plate.
3. Quality control of the process
Production of flexographic resin plates: Exposure control of plate making is the key. The difference in exposure time will make the hardness, corrosion depth and elasticity of the flexible resin plate produced vary greatly;
Long exposure time and overexposure will cause the graphics on the printing plate to be lost or not washed out, and the printing plate will also be deformed, hardened and brittle;
If the exposure time is too short, that is, underexposure, the photosensitive layer on the surface of the printing plate will be washed away when the plate is washed.
Typesetting method
Carton printing generally has more color plates. It is not possible to cut the printing plates too loosely during imposition. It is best to make each color printing plate into a whole;
Care should be taken when pasting unavoidable loose and small editions, otherwise small and fragmentary printing plates will not be firmly pasted during the production process, causing damage and loss during the printing process.
In addition, when pasting, maintaining, and replacing small plates, fine patterns, and text plates, do not pull them too hard to prevent damage and tear the plates.
Printing paste
The printing plate is pasted flat, and the edge of the printing plate must be sealed firmly with water-free adhesive tape. If the printing plate is not in close contact with the surface of the printing roller, the printing plate will tilt upward. The warped parts are easy to penetrate into the ink and bounce off, causing the bounced printing plate to be damaged or lost during the printing process.
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