Three aspects save the production cost of printed version, more practical!

[China Packaging News] 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 texts (such as bar codes, 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. 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.

The flexographic resin plate generally selects a plate material 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 paper, water-free adhesive tape): When using double-sided adhesive paper and water-free adhesive tape to paste the resin plate to the polyester film, if it is found that the adhesion is not strong, do not use it 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 the hydrocarbon defoamer will cause the flexographic resin plate to swell (the n-butanol used to wash the plate after the flexographic plate is exposed is the hydrocarbon), crack the plate and accelerate the damage of the 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;

1, the exposure time is rather long and overexposure can cause the graphic on the printing plate is lost or washed out, the plate deformation will occur, hardening and brittle;

2, the exposure time is too short, i.e., underexposed, the plate will be washed off the surface of the photosensitive layer during washout.

Typesetting method

1, cartons are generally more chromatic printing plate when the printing plate imposition not cut too fragmented, it is preferably formed integrally of each of the color printing plate;

2, can not be avoided scattered small version and paste version carefully, otherwise they will be small bits and pieces of the plate is not firmly attached in the production process, resulting in damage and lost in the printing process.

3, addition of small surfaces or fine patterns, text-based printing paste, maintenance, replacement, do not pull, and tear to prevent damage to the printing plate.

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.