1、 The thickness, moisture and evenness of the paper fed into the unwinder are inconsistent, resulting in inconsistent stress on all parts of the paper web in the paper roll. 

       When the thickness of the paper web is uneven and the paper roll is rolled to a certain diameter, the tension of the whole paper roll will be different. Causes and control of wrinkles in box board paper roll  Causes And Control Of Wrinkles In Box Board Ppaper Roll

      Tapping the rotating paper roll with your palm will feel that the tight part is relatively hard and the measured thickness is relatively large; The loose part is soft and the paper is thin. Causes And Control Of Wrinkles In Box Board Ppaper Roll

      When the difference between the hardness and softness of adjacent parts in the paper roll reaches a certain degree, oblique live folds are generated on the softer parts, and new folds are easy to appear in the parts with large moisture in the paper roll.Causes and control of wrinkles in box board paper roll

Solutions:

 (1) adjust and control various process and technical conditions of the mesh department, and copy wet paper with uniform quantity and good fiber structure. Causes and control of wrinkles in box board paper roll

 （2） Select the reasonable medium height of the press roll and idler, repair each roll surface, make the wet paper web dehydrate evenly at the couch roll, press roll and idler, and dry evenly on the drying cylinder. Causes and control of wrinkles in box board paper roll

（3） Flexibly use the adjusting hand wheel on the paper winding frame to adjust, raise or lower one end of the paper web in the operation of the paper winding cylinder,Causes And Control Of Wrinkles In Box Board Ppaper Roll

        so as to reduce or eliminate the flexible folds in the paper winding operation. The first method is to raise one side of the paper roll, and then this side of the paper roll will be looser; Causes and control of wrinkles in box board paper roll

      Lower one side of the paper roller, then this side of the paper roller will be rolled tightly. On the narrow web paper machine, a hand wheel can be installed on the operating side for adjustment. Causes And Control Of Wrinkles In Box Board Ppaper Roll

       Second, when a hemp rope shaped movable pleat appears on the paper roll, adjust the hand wheel according to the feeling of the palm and the inclined direction of the movable pleat, that is,Causes And Control Of Wrinkles In Box Board Ppaper Roll

        which side of the inclined wavy pattern is higher, use the hand wheel to lower this side of the paper roll;Causes and control of wrinkles in box board paper roll  Causes And Control Of Wrinkles In Box Board Ppaper Roll

       If one side of the wavy line is low, use the handwheel to raise this side of the paper roll. Third, the edge of the paper roll is hard, so that there is a flexible fold in the place adjacent to the hard part. Causes And Control Of Wrinkles In Box Board Ppaper Roll

      If the width range of the flexible fold is narrow, use the adjusting hand wheel to lower this side of the paper roll, in order to press the hard and soft part on the paper roll against the roll edge to the cylinder surface of the paper winder; Causes And Control Of Wrinkles In Box Board Ppaper Roll

       If the range of pleats is wide, raise this side to make this side of the paper roll loose, or deal with it according to the above method. Causes And Control Of Wrinkles In Box Board Ppaper Roll

     （4） When there are live folds, the tighter the paper roll is, the more serious the live folds are. Therefore, the tension of the paper web should not be too large between the winder and the dryer. Causes And Control Of Wrinkles In Box Board Ppaper Roll

       The tension of paper roller with small diameter should not be too large. The tension of paper roller with small diameter should not be too large. Causes And Control Of Wrinkles In Box Board Ppaper Roll

      （5） Give play to the role of the bow roll in front of the winder, that is, use the bow roll in front of the winder to locally adjust the uneven tension of the paper web. Causes And Control Of Wrinkles In Box Board Ppaper Roll

       On the premise of not hindering the paper winding operation, place the bow roll appropriately close to the paper winding cylinder and install it lower to make the area of the paper web covering the cylinder surface larger,Causes And Control Of Wrinkles In Box Board Ppaper Roll

        then the bow roll will play a better role in flattening the paper web and preventing paper folding. Causes And Control Of Wrinkles In Box Board Ppaper Roll

      （6） In normal operation, wrap some paper strips with the same width as the soft part of the paper roll, or tear off a certain length of paper strips at the hard part of the paper roll, Causes And Control Of Wrinkles In Box Board Ppaper Roll

      which can make the tightness of the paper roll consistent and reduce live wrinkles. （7） The paper roller jumps on the cylinder surface due to serious uneven hardness. Causes And Control Of Wrinkles In Box Board Ppaper Roll

     When the live pleats are pressed into dead pleats, the paper roller shall be replaced immediately.Causes And Control Of Wrinkles In Box Board Ppaper Roll

2、 The parallelism, levelness and perpendicularity of the paper winding frame are not aligned, the inclination angle is unstable, the position of the paper winding roller is not placed correctly,Causes And Control Of Wrinkles In Box Board Ppaper Roll

       the weight of the full width of the paper roller pressed on the paper winding cylinder is too different between the front and rear ends, the tension of the paper web entering the paper winding roller is inconsistent, Causes And Control Of Wrinkles In Box Board Ppaper Roll

       and the inclined paper web is rolled into an oblique fold at the end where the paper roller is in heavy contact with the cylinder surface. On the paper roll with larger diameter, live folds with larger length and width are often rolled.Causes And Control Of Wrinkles In Box Board Ppaper Roll

       On the small paper roll just put on the machine, they will be pressed into folded dead folds.Causes And Control Of Wrinkles In Box Board Ppaper Roll

       The solution is: first, use the adjusting hand wheel on the paper winding frame to lower the high side of the paper roll, so that the paper roll can be in uniform contact with the cylinder surface. Causes And Control Of Wrinkles In Box Board Ppaper Roll

      While adjusting, observe the tension on both sides of the paper web until the paper web enters the winder flatly. Secondly, the parallelism, levelness, perpendicularity and inclination of the paper winding frame shall be corrected to make the equipment meet the technical requirements.Causes And Control Of Wrinkles In Box Board Ppaper Roll

3、 The diameter of the paper winding roller and the diameter of the shaft head are too small or bent, the weight at both ends of the paper winding shaft is too light, and the pressure at both ends is inconsistent,  Causes And Control Of Wrinkles In Box Board Ppaper Roll

       resulting in inconsistent paper tension in the paper web and jumping during the operation of the paper roller, resulting in live folds.Causes And Control Of Wrinkles In Box Board Ppaper Roll

The solution is: (1) when processing the paper winding roller with large roller diameter and shaft head diameter, for the paper machine with paper amplitude of 1092mm, Causes And Control Of Wrinkles In Box Board Ppaper Roll

       the weight of the paper winding roller shall not be less than 55kg and the diameter shall not be less than 125mm; The paper width shall be 1575mm. Causes And Control Of Wrinkles In Box Board Ppaper Roll

      The roll weight shall not be less than 80kg and the diameter shall not be less than 150mm. The paper roll is mostly processed with iron pipe or casting, the surface should be round and smooth,Causes And Control Of Wrinkles In Box Board Ppaper Roll

       and there should be good contact with the surface of the drying cylinder, so as to reduce the jump of the paper roll during the initial roll. And pay attention to maintaining the paper winding roller. Causes And Control Of Wrinkles In Box Board Ppaper Roll

      （2） Select a weight with appropriate weight, hang it on both ends of the paper winding shaft when replacing the paper roll, and keep the pressure on both ends of the paper shaft consistent. Causes And Control Of Wrinkles In Box Board Ppaper Roll

        If the paper roll is not straight or thin, leave a paper layer about 50mm thick on the roll. Don’t cut it off and leave it as the bottom layer of the next paper roll, which can reduce the paper damage of the roll core.Causes And Control Of Wrinkles In Box Board Ppaper Roll

4、 When the paper is broken, if the uneven soft and hard paper roller is allowed to rotate over the paper winding cylinder for a long time, it is easy to press the paper web with a certain thickness on the surface of the paper roller into many folds. Causes And Control Of Wrinkles In Box Board Ppaper Roll

       Therefore, it is best to make the paper roll leave the cylinder surface when the paper is broken. Causes And Control Of Wrinkles In Box Board Ppaper Roll

       When guiding the paper web onto the paper roller, pay attention to align the paper tail of the rolled paper roller, and do not let a large number of uneven paper tails get involved in the paper roller, Causes And Control Of Wrinkles In Box Board Ppaper Roll

       otherwise the surface of the paper roller will be uneven, and the good paper rolled on the paper roller will be folded. Causes And Control Of Wrinkles In Box Board Ppaper Roll

      When the paper head is added to the paper roller, the paper web should also be flattened as far as possible. Do not add the paper head into the paper roller in a mess, so as not to cause a large number of folds. During edge tearing sampling, Causes And Control Of Wrinkles In Box Board Ppaper Roll

       it is not suitable to obtain too deep and too much, otherwise a large number of folds will be produced.Causes And Control Of Wrinkles In Box Board Ppaper Roll

5、 When changing the paper roll, in order to make the newly changed paper roll close to the surface of the paper cylinder, in addition to weighting the weight with a steel wire rope hook on the journal at both ends of the paper roll, the manual push roll is used to help roll up the paper roll.Causes And Control Of Wrinkles In Box Board Ppaper Roll

        When changing the paper roll, some operators also stop the fan in the exhaust hood of the drying cylinder for a short time to increase the moisture of the paper sheet, and start the fan immediately after the paper roll is rolled. Causes And Control Of Wrinkles In Box Board Ppaper Roll

      This operation should be fast and the effect is also good. Some operators spray water on the iron roller when changing the paper roller, which solves the problem of weak adhesion between the paper and the iron roller, Causes And Control Of Wrinkles In Box Board Ppaper Roll

      But brings the consequence of wrinkles on the paper at the bottom of the roller due to the water spray wetting many layers of paper.Causes And Control Of Wrinkles In Box Board Ppaper Roll

6、 For the paper with wide web and small quantity, some machines divide the paper in two from the middle with a water needle in the net part to narrow the paper web,Causes And Control Of Wrinkles In Box Board Ppaper Roll

       Or add a small roller in front of the paper winding roller to pick the paper away from the cylinder surface and then enter the paper winding roller, which can receive good results.Causes And Control Of Wrinkles In Box Board Ppaper Roll

         From the above analysis, it can be seen that there are many reasons for the folding of box board paper on the paper winder. Specific investigation and analysis must be carried out and measures must be taken to solve it, Causes And Control Of Wrinkles In Box Board Ppaper Roll

       so as to ensure the quality of finished products.Causes And Control Of Wrinkles In Box Board Ppaper Roll