Corrugated carton flexible photosensitive resin production experience 1

Most domestic corrugated boxes manufacturers still use hand-engraved rubber plates for printing. With the development of market economy, the competition in the corrugated box industry has become increasingly fierce. People have higher and higher requirements for corrugated boxes, and they are used as hand-carved rubbers. Printing is far from satisfactory. To enhance the competitiveness of enterprises, shorten delivery time, provide high-quality corrugated boxes, many corrugated boxes enterprises have launched flexible photosensitive plate plate-making equipment, in order to remain invincible in the fierce market competition.
The flexible photosensitive resin plate is composed of a polyester support film photosensitive resin layer and a protective layer. Compared with the traditional rubber plate, the photosensitive resin plate has many advantages: Fast plate making speed. It can effectively save plate-making time and increase production efficiency.
The reproducibility of the design draft is good, and it is possible to produce a gradation version and a color edition, and get a clearer pattern effect than the rubber edition.
Printing size stability is good. The photosensitive resin plate can be firmly attached to the polyester support film, ensuring dimensional stability and obtaining a very stable printing overprint. The dimensional deformation of the rubber plate has been plaguing the printer.
Thickness of plate. Uniform pressure on the web of the sheet ensures optimum printing quality without the need for flattening and can accurately set printing pressure to produce high-quality corrugated boxes.
High print rate. Can be printed for a long time, with less reproduction rate and downtime. Although the carton paper is rough, the imprinting rate is as high as 500,000, which is 3 to 5 times higher than the rubber plate.
The use of resin plates for high-quality prints requires excellent design and high-quality negatives. Good design drafts are fundamental to high-quality flexible prints to ensure good reproducibility. Design should pay attention to:
1. If photoengraving is used, all the lines and words in the produced ink draft must have the same ink level, otherwise it will lead to unnecessary photo correction and manual modification to produce a satisfactory negative film.
2, in the case of meeting customer requirements, as far as possible to make the Yang strokes become thinner, thicken the pen strokes, which increases the interval between strokes, not easy to cause printing paste.
3, as much as possible to avoid dot and large area color pattern printing on the same block, if the large-area color pattern and thin line pattern separately separate printing, pressure adjustment and cosmetic needle control is much simpler.
4. If a different color is overprinted within a color, and no gaps are required between the colors, the accuracy of the company's printing press should be considered when designing, so that the layout of the two colors can be superimposedly printed. The width of the overlapping portion is the printing machine's Printing deviation.
5, the design draft must consider the resin version of the elongation. During plate making, the plate does not shrink or elongate. When the plate is mounted on a plate roller, the direction plate of the plate roller will extend, and the resin plate elongation can be calculated:
Elongation of resin plate = (plate roller + double-sided tape thickness ÷ (plate roller + double-sided tape thickness + thickness of resin plate) × 10%
The actual size required at design time multiplied by the extension of the resin version is the size of the design draft.
High-quality negatives are critical to the production of resin plates, and the negatives used must be carefully examined:
1. The density of the light transmission area should be less than 0.05. This can ensure that the negative film meets the platemaking requirements. There are strong fine patterns and clear Yinyin 2. The density of the opaque areas should be greater than 4.0. Too low a density will cause the pattern not to be deep enough. Unexpected patterns appear.
3. It is very important for the negative film to have the correct pattern direction, that is, when the film is upward, it is a positive image. This ensures that the negative film is in good contact with the surface of the plate when it is made. (to be continued)