Offset printing experience

1. Water roller velvet anti-jacketing effect is good recently our factory's J2203 type two-color machine, in a large area of ​​the printing field version, found that water roller velvet hair removal, stuck to the printing plate, seriously affecting the product quality. Through analysis, we believe that if you turn the water roller over and over, the fluffy side is set inside and you can avoid the disadvantages of hair removal. So we put back the water roller velvet, through the practice of printing proved that the effect is very good, not only the phenomenon of printing plate viscous roller is eliminated, and the water delivery function is also very good, wetting the printing plate evenly. Since the water roller velvet back cover is better than the positive cover, we now print all the products and change them to all anti-sleeves.
2. Application of dry cloth When the offset press has a long down time, the moisture on the printing plate will easily evaporate and the printing plate will be damaged. Therefore, the printing plate must be coated with glue to protect the printing plate. However, due to the artificial water-spraying cloth coating on the glue coating, the thickness is often uneven, especially the thicker part of the printing plate, it is not easy to wash off the solid after solidification, and serious will “bite” the bad printing plate. Therefore, instead of applying glue, we must use dry cloth to gently pat on the plate so that the glue layer on the plate can be evenly and well washed to properly protect the plate. The resistance to India has also increased.
In addition, the new PS version on the machine printing, after washing through the water treatment cloth, the moisture immersed in the graphic basis, often not inked. At this time as long as the use of dry cloth on the basis of graphics and then wipe it again, wipe the dip of water, it is easy to ink.
3. Printing is wider than the circumference of the drum. Recently, our factory has printed a product. Its graphic width is 670mm, and it is arranged to print on the 01 slow machine. However, the machine's drum circumference is only 620mm. It is incredible to print a picture that is 50mm wider than the drum circumference. Since the product is only printed in one color, its graphic text is large and the interval is also large. We believe that it can be printed twice by virtue of this favorable factor. All parts of the drum can be printed first, and parts not printed can be printed separately. The text will be sun-dried at the mouth, and the semi-finished paper that was printed once will be turned around, which means that it will not be printed.捎 The blank area was transferred to the mouth of the mouth and printed again. This printed text that was wider than the circumference of the drum was printed. The quality was guaranteed and the customer was very satisfied.