The corrugated paperboard line process is made by single-faced corrugating machine to produce corrugated and corrugated paper with strong single-sided corrugated paperboard. After passing through the bridge to the gluing machine to coat the rubber-coated composite paper, it enters into the dryer and is dried and pressed according to production requirements. Lines, slits, and cross cuts are made into box boards.
Obviously, the cause of the waste of raw paper, the reasons for the low yield of paperboard mainly appear in several key processes such as single-sided machines, conveyor bridges, glue compounding, drying, and vertical and horizontal cutting. The following is a discussion of the author's opinions on common problems and handling methods in practical operations.
1. Single-faced corrugating machine
1) After the single-sided machine is turned on, the original paper is input, and the corrugated paper and the paper are not properly attached.
The first is the skew of the output paper, and the acceleration of the speed can be positive.
Followed by, in the same side of the line with the corrugated paper roll on the same line. The "three points and one line method" can be used to solve. That is, set a point on the surface of the preheater cylinder of the corrugating machine or the corrugated paper. After the power is turned on the shaftless support, press the button on the shaftless bracket at the end of the paper or liner, and adjust the screen to the left and right. , paper edge and set point in three lines.
2) The original paper is cracked by the preheater, causing paper breaks.
First, consider the paper to reduce the warm-up area. When joints are present, manually pulling the base paper or assisting in the direction of rotation of the base paper to reduce the mechanical tension can be avoided.
3) When tile and liner paper are inspected by the manufacturer, a small palm-sized mouth is torn in the reel, and the corrugated board of single-faced corrugated board is used after the corrugated machine is input.
Prepare slightly larger than the slap in the boot, corrugated paper (color, gram weight / M2 to be the same as the corrugated paper), the paper has a gap in the paper, corrugated paper nicks, dip plastic glue a little Into the corrugated machine before the base paper into the gap on both sides of the stick can be. Action must be quick, accurate, timely, and safe.
4) After the production quantity is satisfied, there are surplus paper heads, and there are many sides on the side of the paper and paper.
Normally, it is not necessary to cut off until you use a small amount of base paper and then shut down. When you shut down, you must use a knife to cut the base paper neatly. Excess single-sided corrugated cardboard, when the next production uses the same, the same quality of raw paper, in the conveyor bridge and the new single-sided corrugated cardboard bonding good use.
In addition, it is true that there are surplus paper heads for parking reasons, which can be manually rewinded onto large rolls of the same specifications and quality.
5) Try to avoid frequent start-ups, which can effectively prevent paper and tile from sticking.
2, transport bridge
1) There are too many piles of single-sided cardboard on the bridge, and the speed of the dryer is too fast or it suddenly breaks and then the adhesion is not firm.
Bridge operators should pay attention to the constant speed of the dryer to increase the speed, not too fast to start. Bonding broken ends, the upper lapped surface should follow the running direction of the paperboard, and the joints must not be stopped. At the same time, note that the stacking capacity of single-sided corrugated cardboard should not exceed one-third of the length of the bridge.
2) When the width of the corrugated paper in one-sided corrugated cardboard is inconsistent, the paper-gripper that is controlled to go is scraped.
When the width of the paper is wide, the two clips of the paper gripper should be adjusted to be slightly smaller than the width of the paper; if the width of the paper is wide, the portion wider than the paper is trimmed in front of the gripper.
3) After the dryer is turned on, the single-layer boards on all layers are not aligned.
Before the dryer is turned on, the single-sided cardboard holder of each layer shall be moved 2-3cm away according to the size of the side slitter.
3, glue compound
1) In response to the customer's request, ordinary cardboard is used as the paper. After the preheater, the base paper becomes brittle, and it enters the dryer and is torn. Reducing paper tension, or manually assisting in rotating the web until it is normal.
2) After entering the back of the dryer, the edges of the paper and the single-sided cardboard are not aligned. The width of the emergency production paper is not the same.
In the first operation, each layer of paper edge and paper head are aligned and can be sent to the dryer. When the misfeeds are made, the speed of the drying machine can be speeded up. However, the missing part has constituted waste. Whether the width of the face paper is wider or narrower than that of the single-faced corrugated board, it must be on one side.
Furthermore, if the edge of the paper roll is not on a vertical line with the folder of the paper gripper, even if the raw paper edge and the paper head are aligned and sent to the dryer, the running distance will be uneven. In order to solve this problem, we may wish to advance from the side of the conveyor bridge folder to the top of the paper-free bracket and 0.5 cm from the web. It is advisable to jog the button on the axle-less bracket. The edge of the paper is perpendicular to the pendant.
4, dryer
1) For too long time for the dryer to cause a large area of ​​cardboard to open the plastic, the three-layer board is particularly prominent.
Do not stop in production, do not stop, really need to stop, the operator predicts the parking time according to the situation, if not for a short time (five-story board more than two minutes, three-story board more than half a minute) to stop, you should cut off the layers of paper in the gluing machine, will Cardboard opened bake.
2) Dryer belt deviation, cardboard edges open glue, poor adhesion.
Adjust the rectification handwheel; detect unqualified paperboard hand-bonded during stacking.
3) Dryer drying temperature is too high, cardboard degumming debonding, more common in three layers of cardboard, crisp paper inside.
Increase the speed of the dryer, and at the same time, reduce the amount of steam, and notify the gluing machine to increase the amount of glue.
5, pressure line, vertical and horizontal cut
1) The pressure roller breaks the inside and the surface paper; the pressure line exceeds the allowable error.
According to the paper and cardboard dry humidity, the depth of the pressure line can be adjusted flexibly. It is advisable that the indentation of the paper inside is not broken or cracked. In addition to the dimensional error, the concave wheel under the pressure roller is deflected and corrected.
2) Adjusting the trimming is not timely, causing the cardboard to be out of material, dew, and common when the sum of the two trimming edges is less than one centimeter.
The slitter left and right moving device should be adjusted in time. If necessary, the conveyor can be notified to adjust the gripper leftwards or rightwards.
3) The transverse knife is blunt and the imported kraft box board is easy to tear cross sections.
The new knife should be polished or replaced in time; the knife on the bottom must not be too tight to avoid injury.
In addition to eradicating the above problems, we should use the paper web reasonably according to the size of the paperboard produced, try to control the paperboard trimming within 0.5-2cm, skillfully match production, handle faulty paper disease accurately and timely, and open the paper without glue. In the case of impact on quality, we will not use repair and utilization, eliminate artificial waste, and you will find an effective way to reduce paper loss and improve the yield of cardboard.
Obviously, the cause of the waste of raw paper, the reasons for the low yield of paperboard mainly appear in several key processes such as single-sided machines, conveyor bridges, glue compounding, drying, and vertical and horizontal cutting. The following is a discussion of the author's opinions on common problems and handling methods in practical operations.