Talking about the direct plate making technology of sleeve

Talking about the direct plate making technology of sleeve

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The previous flexo plate had to be applied to the plate cylinder after plate making before it could be printed. There is now a more advanced flexographic direct plate-making technology in foreign countries, which can be directly plated on the sleeve, and then the sleeve plate can be printed on the plate cylinder, which is more efficient. This technology is the direct plate making technology of the sleeve. The sleeve direct plate making method can be divided into two methods of laser engraving and laser ablation.

    1. Laser engraving sleeve technology has been used abroad to directly engrave a flexographic plate on a sleeve. In this way, the sleeve can function both as a normal sleeve and as a printing plate. The page made by the prepress system can be directly output to the sleeve by the computer, eliminating the need for exposure, rinsing, curing, and printing, and the working efficiency is greatly improved. For example, the laser engraving sleeve technology of PLOYWEST in Germany can produce a plate with a combination of solid and hierarchical dots to obtain super-fine graphics.

    2. The laser ablation sleeve technology, in the packaged printed matter, often encounters a number of patterns designed to repeat the same version, and can be cut at will. The joints at both ends do not show seams. Although it can be done on a reel press, if you print on a single sheet of paper, it is very difficult to see the seams. The sleeve technology can solve this problem well, because on the sleeve plate, the CTP technology can be used to directly make plates, and the problem can be easily solved. The steps of its making are as follows:

    1 Apply a layer of hot melt adhesive to the nickel or other metal roll of the hollow core. After drying, the cut photosensitive resin is wrapped on the metal roll and the two ends are assembled. Vacuum is drawn from the core of the metal roll (the surface of the roll has a lot of small air holes) so that the photosensitive plate is in close contact with the surface of the metal roll. Then, it was placed in an oven to be heated, and the plate was fused with the adhesive layer on the surface of the metal roll, and then taken out and cooled.

    2 Put the sleeved version of the first step after cooling on the peripheral grinding machine, and grind the outer circumference of the sleeve plate to a certain diameter according to the size requirements of the printing (detected by laser), and the layout is naturally smooth and flawless. After rubbing it, apply a black coating to the surface of the sleeve. Dry and spare.

    3 The second step of the prepared sleeve plate is subjected to digital laser scanning, so that the black coating on the sleeve plate is subjected to laser thermal erosion, and then UV exposure is performed as usual.

    4 Put the exposed sleeve plate into the corrosion chamber for rinsing and corrosion, then take it out and blow dry.