Well offset from the three "three level" work – offset, three flat, in
Offset the "three level" is the offset printing of the more important task is to offset the basic requirements of process operation is key to achieving a balanced ink. Only by improving the offset of the "three level", and the offset quality will have basic protection. Especially the newly introduced Used Offset Press , Should do the job. I like to talk about some of the work experience, to start a discussion.
The so-called offset the "three level" refers to the offset level of water roll. Peace drum roller (printing plates, rubber, impression cylinder) level, pressure balance and the right to reach a more satisfactory printing results.
Water roller level Water level requirements of water roll to roll straight, flat surface to serve, the water pressure to the right and even roll, not too large should not be too small. If the water is not leveling roller, with string, water roller and the pressure between the plates will be uneven, resulting layout of water is too large, too small or uneven coating of water affect the ink-water balance; cause water roller and the plate and the string of water partial pressure between the roller is too large or too small, causing the operation is not smooth, accelerating the wear plate. Well water level of the work roll, to note the following:
1. Attention to check the water roll parallelism, whether the water roll bending, deformation phenomena, if it is returned to the water system of rollers, the water rolls of plastic core must be straight, the surface to be polished.
2. Water rolls down to cover a good, strong stitches and sewing, to pay attention to check whether the water roll down the surface level services, whether tight, does not allow for relaxation. Water rolls down wrap, you can not immediately install, should use Fountain Solution Evenly scrubbed twice, after wetting its full, prior to the installation.
3. Properly adjust the water pressure roller, so that the left,. Uniform pressure on the right point. First adjustment of water between the roller and roller series of water pressure, and then adjust the water between the roller and the pressure plate, through the paper pull measurement, repeated measurement of water, carefully roll left. , And the right point of pressure on the pressure points consistent with the basic balance. Specifically: Select straight kraft 2-3 silk thread, cut growth 40cra. Width 2cm, between 0.1-0.15mm thickness of paper were placed in water, water roller or roller and string position between the plates, pulling together after the paper roll, Sheung Shui, adjustable hand wheel and dial button, so taut with the tension to the paper, paper can not be pulled out fracture, confirmed is appropriate.
4. Maintain the sink roll. String roller clean water. Work is completed or when the water rolls off work to carry out thorough cleaning and rinsing of the middle from the start, two have to scrape, wash dry; dispute Guawan counterclockwise hands after going to help peace; at work, should be formed before the water roller, carefully wiping 2 and intermediate.
5. Attention to check the water roller bearings. This is important, but easily overlooked. Bearing clearance of small, small error and a smooth rotation is possible, it will not be beat. If the bearing has worn beyond the range of error, it will turn unstable, affecting transfer of water. The water then use the roller can not meet the requirements should be replaced, the installation must be careful not to exceed the error range. If conditions should be no or little use of ball bearings, roller bearings or the use of needle roller bearings.
Roller level Level requirements roller ink roller flat, surface grind, running on the surface not more than beating the best amount of 0.05mm, the pressure rollers and even have the right, and the roller surface properties to be good, good ink transfer performance, so as to ensure uniformity of ink transfer. Stable. Good level of work rollers to note the following:
1. Ink roller core to be flat, level surface to serve, keep the surface of beating traffic in less than 0.05mm, the maximum not more than 0.1mm, or bounce rate is too large, will directly affect the uniformity of ink transfer.
2. Roller pressure roller adjustment methods and similar water also should pay attention to measuring and adjusting the left. , And the right point to make it consistent with pressure equilibrium.
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