In the production of offset printing, the size of the printing pressure is usually indirectly expressed by the maximum compression of the liner when the cylinder is pressed. Correctly measuring the thickness of the liner is the key to calculating the size of the printing pressure.
During offset printing, the blanket is stretched tightly on the blanket cylinder. The blanket is stretched after being pulled in a warp direction. The amount of extension is proportional to the amount of pull. However, in the circumferential direction of the blanket, due to friction, the pulling force at different points is different. The pulling force at both ends near the plate holder is the largest, and the pulling force at the middle position is the smallest, from the middle to the plate. The pulling force at both ends of the clamp increases sequentially. As the blanket is stretched and stretched, the adhesive layer will be thinned and the thickness will be reduced. Therefore, the thickness of the blanket measured in the free state between the rubber blanket and the rubber roller is not equal to the thickness after tension. To correctly measure the thickness of the liner, a barrel caliper should be used to measure the thickness of the liner after tightening at different positions in the circumferential direction of the rubber cylinder, and use this thickness to calculate the printing pressure. However, at present, many small printing plants are not equipped with a tube diameter gauge, and they usually use a micrometer to measure the thickness of the blanket and liner. Since the micrometer can only be measured in the free state before the liner is not installed, the operator should deal with the blanket tight. The difference between the thickness after the thickness and the thickness in the free state is correctly estimated so as not to cause a large deviation in calculation. For soft linings, this difference may have little effect, while for hard linings, due to the large elastic modulus of the hard linings, a small amount of error in the calculation of compression will cause a large brush pressure Changes, improper printing pressure will seriously affect the correct transfer of ink.
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