Offset printing uses the principle of water-ink balance to make pictures appear on paper. The contact between paper and fountain solution will cause the paper to stretch. As mentioned earlier, the degree of stretchability of the paper is related to the direction in which the fibers are arranged. The stretch rate in the direction of straight strands is less than that of transverse strands. Therefore, the offset printing process is customary to use the paper straight thread direction parallel to the cylinder axis to print, in order to minimize the inaccurate graphic overprint caused by the paper's hygroscopic elongation. This is particularly important in multi-color printing.
There is also a view that, from the perspective of paper feeding, the straight thread direction of the paper is relatively stiff, which is convenient for blowing and conveying; while the stiffness of the paper in the horizontal thread direction is not enough, the two ends are easy to curl downward or upward, which affects the blow loose and conveying. Therefore, the paper should be printed parallel to the direction of the straight strands of the paper and the direction of the paper feed. This view certainly has some truth, but it is a bit of "scrapping the book". Because our ultimate goal is to produce high-quality printed products, in this regard, it is far more important to seize the main contradictions to avoid overprinting than to facilitate paper feeding.
In addition, if the same batch of purchased paper cannot be used when printing a book, or if the small offset press uses a small cutting residue, in these cases, it must be ensured that the same book printed in the same batch cannot be mixed with different yarns. The direction of the paper. Otherwise, it will not only result in inaccurate overprinting due to the different paper expansion and contraction, but even the edge of the finished product will be uneven after a period of inventory.
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