Proper use of offset printing blankets production

In offset printing production, Blanket as a transfer vector graphic plays an important role, its quality will directly affect the printing results. Daily operations, the operator will frequently come into contact with the blanket, the blanket is extremely important in the proper use of offset printing production. Installation link Note:

(1) Before installing replacement blanket first pad of paper, while accurately measuring the total thickness of the pad of paper. Measurement method: First, to measure the thickness of a pad of paper, and then calculate the number of the desired pad of paper, the final measure of the total thickness of the liner paper. If the error is greater than the total thickness of 0.02mm, pad of paper will have to be appropriately increased or decreased so that the total thickness is more accurate. If the total thickness of the liner paper is large, it is easy to produce the following negative phenomena: the printing pressure is too large, plate wear and tear; Graphic by extrusion outlets; turn over print jobs heap imprint phenomenon is easy to produce, resulting in waste; field print jobs prone to peeling paper. If the total thickness of the pad of paper is small, the printing pressure will be too small, resulting in graphic printing false hair virtual network, not even cause ink printed on. Therefore, when measuring the total thickness of the liner paper must be careful and accurate.

(2) at a fixed blanket, first blanket placed in a suitable location and then tighten the clamp screw blanket, efforts should be moderate, even, to be tightened clamping screws after all, it is necessary once again checked one by one, in order to avoid the presence of omissions. It should be noted that, before tightening the clamping screws, shall ensure that the blanket ends are in the mounted position, to avoid the end of the blanket has been clamping screws, but the situation is far from the other end of the installation location appears.

(3) In the process of the blanket taut, be sure to blanket clip clamped butterfly clip blanket cylinder, make sure the blanket is completely clamped.

In addition, efforts should be appropriate taut blanket. If the intensity is too large, prone to blanket off or reduced flexibility problems affecting normal printing; if the intensity is too small, easily lead to printing have a vertical ghosting and other failures.

Scrub link Precautions

(1) The amount of cleaning agent on the cloth should not be too large, when the blanket is not difficult to cotton scrub prevail. In order to process does not have to scrub the blanket to use too much energy, the operator usually like the cotton into the more detergent, this will bring some negative consequences, such as printing combined pressure after excessive blanket The cleaning agent will be pressed onto the plate, it will be left to other components in the device during operation, thereby causing more print waste. In addition, most volatile cleaning agent is poor, therefore, should pay attention to controlling the amount of cleaning agent.

(2) to observe whether the blanket surface impressions (especially ring true when the shift and take the paper). Once they found indentations, on the one hand to promptly view graphic printing area corresponding locations on the existence of the phenomenon of missing network, on the other hand the use of blanket Repairing agent (capable of reducing the elastic blanket special paste) to the indentation place to be reconditioned. If the indentation deeper, you need to pad the back of the blanket layer of tissue paper or tape to ensure blanket substantially flat surface, avoid the subsequent lack of network print jobs appear phenomenon.

(3) to observe the blanket or plate after opening the presence or absence of water droplets, water drops, if present, it may be too large amount of water, it should be to reduce the amount of water or adjust the water pressure rollers, avoid large water washout phenomenon ʱ??

(4) present on the surface to see if the blanket piling phenomena. In the cold winter heap Mexican phenomenon most likely to occur, because the temperature is low, the ink viscosity is large, can not be fully transferred to the paper, the paper easy to stick to the blanket, thereby damaging the blanket. When they find heap Mexican phenomenon, it should be appropriate to add to withdraw pale agent in the ink, the ink in order to increase liquidity, while increasing the room temperature.

(5) blankets thoroughly scrub, scrub the corresponding region must not only printed graphic. Otherwise, the printing process of the blanket region not scrub the ink may accumulate too much, resulting in combined pressure when the blanket was crushed. In addition, the blanket scrubbed mouth portion is also very important, because the mouth prone to rejection Mexican phenomenon, caused by the accumulation of ink, if not scrubbed clean, not only crushed blanket, knocking the printing ink will be at the gripper edge two pieces of paper stuck together, affect the printing quality.

(6) When replacing larger print jobs, pay attention to scrub the remaining paper on the blanket powder (from the number of print jobs), generally cotton cloth dampened with water scrub, to avoid the presence of the paper powder area stained with ink.