紙張長度變化的影響因素及注意事項
Influencing factors and precautions of paper length change
影響因素
influence factor
1.張力
1. Tension
張力即印刷過程中輸紙系統對紙張的拉伸力，印刷過程中過大的張力會拉長紙張，印刷后消失張力，紙張必然回縮，使配頁出現時長時短的問題，從而影響到配頁。
Tension refers to the tensile force of the paper feeding system on the paper in the printing process. Excessive tension in the printing process will lengthen the paper. After printing, the tension will disappear, and the paper will inevitably retract, resulting in the problem of long and short time of page matching, which affects the page matching.
2.紙張含水量
2. Water content of paper
紙張含水量不同，也會造成紙張長度的變化。紙張含水量越大，印刷后紙張的收縮也就越嚴重。
The different moisture content of paper will also cause the change of paper length. The greater the water content of the paper, the more serious the shrinkage of the paper after printing.
3.紙張定量
3. Paper weight
在相同張力下，印刷所用紙張的定量越大(紙張越厚)，印刷后紙張的收縮嚴重，但也要考慮到厚紙含水量大的因素，一般情況下，厚紙應加大張力。
Under the same tension, the larger the quantity of paper used for printing (the thicker the paper), the serious shrinkage of paper after printing, but the factor of large water content of thick paper should also be considered. Generally, the tension of thick paper should be increased.
注意事項
matters needing attention
(1)印刷過程中，一種印品盡量使用相同、相同厚度的紙張，這樣可以在印刷中使張力保持恒定。
(1) In the process of printing, paper of the same brand and thickness shall be used as much as possible for a printed matter, so that the tension can be kept constant during printing.
(2)實際生產中，即使使用相同、相同厚度的紙張，紙張含水量也有不同，要注意對其進行辨別。可用手觸摸的方法，一般含水量大的紙張發涼、發澀;相同寬度、和蔗的紙張，含水量大的會重一些，因此要適當減小張力。但要注意紙張適性，可以把紙張在生產車間多放置一段時間，以適應車間的溫、濕度，從而解決紙張含水量問題。
(2) In actual production, even if the paper of the same brand and thickness is used, the water content of the paper is different, so we should pay attention to distinguish it. It can be touched by hand. Generally, the paper with large water content is cold and astringent; The paper with the same width, and sugarcane will be heavier if the water content is large, so the tension should be reduced appropriately. However, we should pay attention to the suitability of the paper. The paper can be placed in the production workshop for a period of time to adapt to the temperature and humidity of the workshop, so as to solve the problem of paper water content.
(3)遇到不同定量或不同品種紙張的多聯單，更應注意張力的調整。一，在印刷一聯時，用3m以上孔距尺測量，并比標準長度放出2~4mm,以彌補因失水而引起的紙張收縮;二，在印刷二聯時，也需用3m孔距尺對紙張孔距進行測量，如該聯紙張較厚，則可比標準長度多放出1~2mm,紙張含水高，收縮系統數大。如此將聯都根據紙張厚薄在孔距上給予不同的加放量，使配頁時每聯紙張都能保持基本一致。
(3) In case of multiple sheets with different quantities or different varieties of paper, pay more attention to the adjustment of tension. 1、 When printing a copy, measure with a hole spacing ruler of more than 3m and release 2 ~ 4mm compared with the standard length to make up for the paper shrinkage caused by water loss; 2、 When printing two sheets, a 3M hole pitch ruler is also required to measure the paper hole pitch. If the sheet is thicker, it can be released 1 ~ 2mm more than the standard length, with high water content and large number of shrinkage systems. In this way, different addition amounts are given to the hole spacing according to the thickness of the paper, so that the paper of each page can be basically consistent during page matching.
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