一、低克度原纸带来的问题
1、 Problems of low gram base paper
用低克度纸做瓦楞纸板面纸时，会出现瓦楞纸板表面显坑纹的毛病。容易引起显楞和在楞的低凹处印不出所需的图文内容，针对显坑造成的瓦楞纸板表面不平整，应选用回弹性较好的柔性树脂版做印版，来克服印刷不清晰和露底的缺陷。尤其是用低克度纸生产出来的A型瓦楞纸板，经印刷机印刷会使瓦楞纸板的平压强度受到较大损伤，另外瓦楞纸板经过印刷辊和压印辊后，其边压强度也会有较大损伤。
When using low gram weight paper to make corrugated board face paper, there will be pit marks on the surface of corrugated board. It is easy to cause the corrugation and the required graphic content can not be printed on the low concave part of the ridge. In view of the uneven surface of the corrugated board caused by the pit, the flexible resin plate with good resilience should be selected as the printing plate to overcome the defects of unclear printing and exposure. In particular, the A-type corrugated board produced by low gram weight paper will be greatly damaged by printing press. In addition, the edge pressure strength of corrugated board will also be damaged after passing through printing roller and embossing roller.
如果瓦楞纸板的面纸和里纸克度相差太大，还容易导致瓦楞纸板线生产出的纸板出现弯曲。纸板弯翘对印刷会带来套印不准和印刷开槽走位现象，因此对弯翘纸板应采取压平后再印。如果强行印刷不平整的瓦楞纸板容易引起走位。也会影响瓦楞纸板的厚度下降。
If the difference between the surface paper and the inner paper of corrugated board is too big, it is easy to lead to the bending of the cardboard produced by the corrugated board line. The warping of paperboard will lead to overprint inaccuracy and printing slotting, so the warped paperboard should be flattened before reprinting. If forced printing uneven corrugated board, easy to cause displacement. Can also affect the thickness of corrugated board.
二、原纸表面粗糙度不同带来的问题
2、 Problems caused by different surface roughness of base paper
在表面粗糙、纤维明显的原纸上印刷，其油墨的渗透性大，印刷墨迹干燥快，而在表面平滑度高、纤维质密坚韧的纸上印刷，其墨迹的干燥速度慢。因此在较粗糙的纸张上，应加大施墨量，在表面平滑的纸张上应减少施墨量。在没有施胶的纸上印刷墨迹干燥快，而在经过施胶的纸上印刷墨迹干燥慢，但印刷图案的再现性好。如涂布白板纸因吸墨性比箱板纸、茶板纸小，墨迹干燥慢,而平滑度又比箱板纸、挂面纸、茶板纸高，因此，在其上面印刷细小网点的分辨率也高，其图案的再现性也比挂面纸、箱板纸、茶板纸要好。
When printing on base paper with rough surface and obvious fiber, the ink permeability is large and the ink drying speed is fast, while the ink drying speed is slow when printing on paper with high surface smoothness and dense and tough fiber. Therefore, in the rough paper, the amount of ink should be increased, and on the paper with smooth surface, the amount of ink should be reduced. The ink drying on the paper without sizing is fast, while that on the paper after sizing is slow, but the printing pattern has good reproducibility. For example, because the ink absorption of coated white board paper is smaller than that of box board paper and tea board paper, the ink drying is slow, and the smoothness is higher than that of box board paper, hanging paper and tea board paper. Therefore, the resolution of printing small dots on it is also high, and the reproducibility of its patterns is better than that of hanging paper, box board paper and tea board paper.
三、原纸吸收差异带来的问题
3、 Problems caused by the difference of base paper absorption
由于造纸原料的差异和原纸施胶、压光、涂布的差异，在吸收性能方面就不同，如在单面涂布白板纸和牛皮卡上进行叠印时，因吸收性能低，墨的干燥速度就慢一些，所以应降低前一道水墨的浓度，提高后面叠印水墨的粘度。并将线条、文字、小图案放在色印刷，把满版实地放在一色印刷，这样可以提高叠印效果，另外把深颜色的放在前面印，把浅颜色的放在后面印，可以遮盖套印误差，因为深色覆盖力强，有利于套印标准，而浅色覆盖能力弱，放在后面印即便有跑位现象也不容易观察出来。
Due to the difference of papermaking raw materials and the difference of sizing, calendering and coating of base paper, the absorption performance is different. For example, when overprinting on single-sided coated white board paper and pickup, the drying speed of ink is slower due to low absorption performance. Therefore, the consistency of the previous ink should be reduced and the viscosity of the later overprint ink should be increased. The lines, characters and small patterns are printed in the first color, and the full page is printed in the last color, which can improve the overprint effect. In addition, the dark color is printed in front of the printing, and the light color is printed in the back, which can cover the overprint error. Because of the strong coverage of the dark color, it is conducive to the overprint standard, while the light color coverage is weak, even if there is run-off phenomenon in the back printing It's not easy to see.
原纸表面的施胶状况不同也会影响对墨迹的吸收量。施胶量小的纸吸墨多，施胶量大的纸吸墨少，所以应根据纸的施胶状态，调整各墨辊的间隙，也就是调小各墨辊的间隙，来控制印版的着墨量。由此可见，原纸入厂时应对原纸的吸收性能状况进行检测，并给印刷开槽机和配墨人员一个原纸的吸收性能参数，以便于他们配墨和调整设备。并针对不同原纸的吸收状态，调整墨的粘度和PH值。
Different sizing conditions on the surface of base paper will also affect the amount of ink absorption. The paper with small sizing amount absorbs more ink, while the paper with large sizing amount absorbs less ink. Therefore, according to the sizing state of the paper, the gap of each ink roller should be adjusted, that is to say, the gap of each ink roller is adjusted to control the ink amount of printing plate. It can be seen that when the base paper enters the factory, the absorption performance of the base paper should be tested, and a parameter of the absorption performance of the base paper should be given to the printing slotting machine and ink dispensing personnel, so as to facilitate their ink mixing and equipment adjustment. According to the absorption state of different base paper, the viscosity and pH value of ink are adjusted.
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