In the offset printing process, the role of the blanket is to transfer the graphics and text on the printing plate to the substrate paper completely and clearly. In order to strive for the perfect picture and text transfer, the blanket must have the following characteristics:

The thickness of the blanket should be even

The uniform thickness will make the printing pressure evenly distributed, and the color density of the printed ink will be more symmetrical, and the size of the image and text will not change easily during the process of image and text transfer.
Has good flexibility

Ordinary solid rubber cloth has good elasticity. The effect of image transfer and ink absorption performance may also be good. During the printing process of ordinary solid rubber blankets, the surface rubber layer often produces a convex hull at the front edge of the impression line. According to the speculation of the impression principle, hard rubber The volume of the cloth will not shrink under pressure, so it can only be squeezed to both sides of the impression line. However, choosing to use an air cushion blanket will not cause the convex hull problem at the leading edge of the impression line.

Blanket has a lower elongation

The blanket has a dense structure and high mechanical strength, which is conducive to the increase of tensile strength, and thus reduces the amount of deformation of graphic transfer.

Good ink absorption and transfer performance

It can ensure that the ink color is uniform and the writing is clear during the printing process.

The rubber cloth has good oil resistance, abrasion resistance, heat resistance and aging resistance, and has the above various properties, which can extend the service life. In addition, it also has acid resistance, alkali resistance and corrosion resistance. The quality of the blanket is directly related to the quality of graphic transfer. Although there are many factors that affect the quality of graphics, including machinery, plate making, materials, process control, etc., but the quality of the blanket is one of the important factors, because the blanket is penetrated by gasoline, kerosene, and engine oil during the printing process, Under pressure and relative friction between the roller and the roller, periodically stretched, squeezed and deformed, the blanket will be sticky, deformed and lack of good elasticity due to sulfur loss, thus affecting the transfer quality, in this case , You have to replace the old blanket.

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