1.输纸台压纸轮的压力不匀称
1. The pressure of the paper pressing wheel of the paper feeding table is uneven
纸张在传送全过程中备受轴向力的作用，导致纸张在前规定位时正中间位置鼓起，在压印后造成皱褶。
The paper is subjected to axial force in the whole process of transmission, resulting in the bulging of the paper in the middle position when the front gauge is positioned, resulting in wrinkles after embossing.
2.压印滚筒叼纸牙排的叼力不等
2. The gripping force of the paper gripper row of the embossing cylinder is different
假如压印滚筒叼纸牙排两边的叼力不够，则纸张的拖梢处变皱；假如一边的叼力不够，则相对应的拖梢边变皱；假如正中间的叼力不够，则纸张正中间位置变皱。
If the holding force on both sides of the paper teeth row of the embossing cylinder is not enough, the trailing tip of the paper will wrinkle; If the holding force on one side is not enough, the corresponding trailing edge will wrinkle; If the holding force in the middle is not enough, the middle position of the paper becomes wrinkled.
3.纸张交接不恰当
3. Improper paper handover
在压印前的纸张交接全过程中，假如配合不恰当，导致叼口边纸张长度发生变化，则拖梢位置易变皱。
In the whole process of paper handover before embossing, if it is not properly matched, resulting in the change of paper length at its mouth, the trailing tip position is easy to wrinkle.
4.牙垫高低不平
4. Uneven tooth pad
纸张被叼住时，假如牙垫不平衡，纸边会造成波浪形，叼口位置局部变皱。
When the paper is held in its mouth, if the tooth pad is unbalanced, the paper edge will cause wave shape, and the position of its mouth will be wrinkled locally.
5.纸边与叼牙的位置有误
5. The position of the paper edge and its teeth is wrong
纸张定位后，假如纸张被叼牙叼住了一点，导致纸边不平整而造成变皱状况。

After the paper is positioned, if the paper is caught by its teeth, the edge of the paper will be uneven and wrinkled.
6.压印滚筒表层黏附的墨迹过厚
6. The ink adhered to the surface of the embossing cylinder is too thick
压印滚筒表层黏附的墨迹过厚使纸张压印时不平服，也会造成局部短距离变皱变形。
The ink adhered to the surface of the embossing cylinder is too thick, which makes the paper uneven during embossing, and also causes local short-distance wrinkling and deformation.
纸张根本原因
Paper root cause
1.敲纸痕迹过深、过密
1. The paper knocking marks are too deep and dense
因为敲纸用力不恰当，使敲纸痕迹过深、过密，印刷时在敲纸的折痕处易造成皱褶。
Because the paper knocking force is inappropriate, the paper knocking trace is too deep and dense, and it is easy to cause wrinkles at the crease of the paper knocking during printing.
2.纸张丝缕方向
2. Paper strand direction
纸张进到机器设备压印时，假如其是直丝缕，就非常容易导致丝头变皱。
When the paper enters the machine and equipment for embossing, if it is a straight silk thread, it is very easy to cause the silk head to wrinkle.
3.纸张含水量过大
3. The water content of the paper is too large
纸张含水量过大，纸张自身纤维膨胀，在压印全过程中，膨胀的纤维由肥大变窄，易造成叼口伸向拖梢方向的枝状皱褶。
The water content of the paper is too large, and the fiber of the paper expands. In the whole process of embossing, the expanded fiber narrows from hypertrophy, which is easy to cause dendritic folds extending from its mouth to the trailing tip.
4.环境温湿度的干扰
4. Interference of ambient temperature and humidity
环境温湿度变化，导致纸张含水量不匀称，如四周含水量大于中间，造成荷叶边，印刷时纸张易变皱。
Changes in ambient temperature and humidity lead to uneven water content of the paper. For example, the water content around is greater than that in the middle, resulting in ruffled edges and easy wrinkling of the paper during printing.
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