How to make imposition better for offset printing?
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High-precision accuracy of the product of the main part of the product should be arranged in the mouth as much as possible at the time of plate making, because the paper under the pressure of the imprinting force under the width and the length of the two corners of the tip will be a slight expansion, the greater the pressure, The more stretching, the more trapezoidal the trapezoids are.
Printed high-precision prints are printed on paper of a smaller size, because the larger the prints, the greater the amount of paper deformation due to changes in water content and printing pressure.
Thicker paper should be printed along the axial direction of the drum using the lower elongation fiber length direction. Because the paper fiber is completely wet, the increase in diameter is much larger than the increase in length. (horizontal feed)
The position of the paper on the offset press is determined by the front stop and the side stop, the front stop controls the position of the paper in the up-down direction, and the side stop controls the position in the left-right direction of the paper. In theory, the corner where the chin mouth meets the side baffle should be the most accurate position for overprinting. In actual production, in order to avoid serious overprinting inconsistency on the opposite side of the barrier, consideration should be given to placing the product with the highest registration requirements in the middle of the left and right direction of the paper.