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Perspective Offset Blanket

    Is the offset blanket, one of the important material, the correct choice and use of blanket CTP, printing for ensuring product quality, increase blanket life is extremely important. Here's to highlight the main features of blanket and the election, with the Tao.

    1. The main characteristics and selection of blanket

   (1) flexibility. Means the blanket immediately after the removal of the external force the ability to restore the status quo ante. This is a blanket the most basic and most important technical requirements, which determines whether the normal transfer of printing ink. The printing process, the blanket thousands of times per hour, subject to compression, due to compression fatigue will produce permanent deformation will lead to thinning proofing blanket thickness, elasticity lower ink and mass affect the ink performance. Therefore requested the flexibility of blanket is better compressive deformation is smaller, in order to prevent contraction thin blanket to ensure the transfer of results and print quality of graphics. Plate

   (2) hardness. That blanket the ability to resist external beat depression. General blanket hardness 60 ~ 70 ° (HS) between. High hardness of the blanket blotting equipment maintenance and maintenance of a clear and easy access to uniform ink, but also easy to wear plate on the machine itself, the accuracy and blankets also higher; hardness of large quantities of low compressible blanket , ink receiving correspondingly large, but the network easier to increase. Therefore, the hardness to be suitable for blanket EFI, should take into account three factors, namely, print quality, printed version of the life, press and blanket their accuracy.

   (3) smoothness. That blanket the surface smoothness. Blanket surface roughness as possible, printing network, graphic outline of the more clear;, but spent a good blanket the surface of a smooth ink is poor, it will affect the ink acceptance and transfer, and easy absorption of paper wool and other impurities. Therefore, printing materials, blankets, surface treatment must be to make the distribution of millions of tiny sand on the head. When the blanket surface after long use has become smooth, glossy coating available cleaning agent would be destroyed, to enhance the surface roughness.

   (4) elongation. Means the blanket in a certain tension accounted for under the original length of the percentage of elongation. Elongation depends on the size of the end of cloth layers, material properties and strength. Compact structure at the end of cloth fabric uniform, high mechanical strength, the elongation of a small blanket dairy packaging, the deformation coefficient is small, and thus has a precise overprint, graphic transfer a small amount of distortion, imprinting clear advantages; contrary print quality on the difference.

   (5), oil, and solvent resistance. That blanket the surface rubber to resist infiltration of oil or the ability of certain solvents. The printing process, the blanket surface constantly inks, solvents, cleaning agents, contact, the absence of resistance, their contact with shares in the north part of the expansion will affect the printing quality. So Blanket must have a good oil and solvent resistance, can guarantee the stability of print quality. Printing Down

   (6) The acid nature. That blanket the surface acid-base plastic material and corrosion resistance capabilities. Offset the dampening solution containing weak acid substances inside, while the PS version of revised version of cream contains alkaline substances. Therefore requested the blanket with the acid and alkali stability and corrosion resistance.

   (7), abrasion, heat and anti-aging nature. Refers to the ability to blanket bear the heat of friction. Printing high-speed operation, the blanket by the friction heat and aging. Therefore, a good physical and mechanical properties required Blanket with wear-resistant, heat and anti-aging properties of a variety of offset printing, in order to extend their useful life.

    Offset Blanket is currently divided into ordinary blankets and air mattresses blankets, also need to pay attention in the selection of a few.

Cushion Blanket for rigid packages with more rigid lining or neutral package lining of the printing press and high-speed presses, printing high line screens of color products. Its a micro-bubble foam layer, effectively reducing the network increases the extent and level of loss, enhance the clarity of graphics gravure printed products and improve the first-order harmonic color reproduction accuracy. At the same time, its sensitivity flexibility and impact resistance than ordinary blankets, for high-speed printing, the printing pressure can be stabilized, reducing the internal friction and aging rate of blanket color and prolong life.

    Film if we adopt the soft bag lining printed generic product, due to the compression of soft packet lining large amount of embossing lacking a broad prospect, network easy to spread out increases, offset by the transfer of air cushion blanket Photo advantage of the high rate of accuracy would not be worth the use of price much higher than normal cushion blanket of the blanket. If the accuracy of printed matter much, when using soft bag lining would be more cost-effective use of ordinary blanket.

    Another character in the use of UV ink or UV Varnish may lead to a general ink roller, blanket, or swelling of resin plates, and even produce ink peeling or surface fragmentation phenomenon. Therefore, we should select the appropriate UV-specific or blanket and resin versions.

    2. The proper use of blanket

(1) blanket of the crop

In the blanket on the back of a vector subscript, or marked with color lines of latitude and longitude position of blanket, cut when the data were cut in accordance with specifications required for the size of its operations through the roller to the same direction with the regional reports, zonal parallel with the version folder. Cut when the angle is to ensure that four right angles, can not be skewed, or blanket will Shouli Bu Jun, and easy to wiggle or distorted, causing network deformation.

(2) The measurement of Blanket

Offset control of the printing pressure is an important part of newspaper printing, print the size of the pressure in the cylinder liner is usually combined with the package when the maximum amount of compression pressure indirectly expressed. In order to ensure constant printing pressure in the replacement of a new blanket, we should be measured on the blankets and cushions to calculate the total thickness of lining package and in accordance with changes in the thickness of the paper bag lining thickness at any time to adjust print, to accommodate the printing pressure requirements.

Measurement, the application cylinder diameter instrument in the rubber roller circumferential tension were measured in different locations of the package after the lining thickness, in order to calculate the printing pressure. If the micrometer measurements, the best measure of the four blanket edge, and to post-tension on the blanket thickness and the thickness of the free state, the difference was an accurate assessment of color management, to reduce the deviation. Digital Press

(3) The blanket installation

When installing blanket, pay attention to the depth of blanket inserted version of the folder should be consistent. First version of a folder on the Turn of the Screw, with a ruler measuring about 2 edition folder is parallel to, and then tighten the second screw only version of the folder. After all the screws are tightening even with a ruler and then check in order to prevent the process of tightening the screws in the blanket position change. Offset

(4) blanket cleaning

Solubility should use strong, volatile organic solvents to do quick blanket of detergent, such as special cleaning agent or gasoline manuscript, if slow to use kerosene or other volatile solvent cleaning blankets, easy to make blanket swelling. Blanket Cleaning timely, and ink wash to dry, do not let ink left in the blanket inside the porous surface, otherwise the course of time would be oxidation of the conjunctiva containers to make the surface smooth and bright ink film and reduce its capacity, affect product quality, and will accelerate the aging.

If the blanket has a slight concave pressure phenomenon, or the transmission performance degradation ink, cleaning agent can be used to restore Blanket investment purchases, and then scrubbing with water or a damp cloth. Cleaning agent to prevent penetration into the blanket cleaning the bottom cloth, so that the edge expansion of blanket. Half-way stop and work a long time before they should be blanket washing.

(5) blanket storage CTP

Blanket should be avoided conflict with oil and acid, alkali, salt and other chemicals at the same time to avoid the glare, heat and humidity environment, otherwise the expansion deformation of the surface is easy to produce, hair sticky, crust, cracks, hardening, and the underlying phenomena such as cloth worn . General storage blanket application of black paper wrapped, stored in ventilated and dry place restructuring, to maintain the relative humidity of 65% to 70%, temperature around 22 ℃.

Temporarily unused as Pibu should promptly wash, talcum powder and then cast a store. Blanket storage time to prevent the stress and folded, so as not to affect their flexibility and compression deformation of flatness. Multi-block blanket should be placed face to face or back to back and stacked using digital presses to avoid affecting its surface flatness.
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