The process of corrugated board line is made of single-sided corrugated machine corrugated and paper stick firmly single-sided corrugated board, through the bridge conveyor glue machine coated with composite surface paper, into the dryer drying, according to the production requirements of pressure line, longitudinal cut, transverse cut and made of box board.
Obviously, the reason for the waste of base paper and the low rate of finished paperboard mainly appears in the key processes of single-sided machine, conveying bridge, glue-on compound, drying and cross-cutting of press line paper. Below on the practical operation of the common problems and methods to talk about the author’s opinion.
1, single side corrugated machine
1) Input base paper after starting the single-sided machine. Corrugated paper and lining paper don’t fit neatly.
The first is the output paper deflection, speed up the moment can guide.
Follow-up, tile paper reel with the side line is not on the same straight line. Can use “three point one line method” to solve. That is, a point is set on the cylinder surface of the corrugated machine or the lining or the tile paper preheater. After loading the paper on the shaftless bracket before starting the machine, the button on the shaftless bracket is moved at one end of the tile paper or the lining paper, and the left and right adjustment is made by visual inspection until the edge line of the tile and the lining paper becomes a line with the set point at three.
2) The base paper cracks through the preheater, resulting in broken paper.
First, depending on paper to reduce the preheating area. When the joint appears, manual traction of the base paper or according to the rotation direction of the base paper to assist the force to reduce the mechanical tension can be avoided.
3) tile, in the paper in the manufacturer inspection, the drum tore a palmsize small mouth, input corrugated machine after single-sided corrugated board material.
Before starting the machine, prepare a slightly larger than the palm of the li, tile paper (color, weight /M2 to be the same as the corrugated base paper), the paper has a gap to take the paper, tile paper gap to take the tile paper, dip a little glue on the glue tray, before the base paper into the corrugated machine clamp the gap on both sides of the glue can be glued. The action must be prompt, accurate, timely and safe.
4) After meeting the production quantity, there is surplus paper, tile paper and lining paper are more and less on one side.
In general, it is not necessary to cut off until the base paper on the other side is used up, and then stop the machine. When the machine is stopped, the base paper should be neatly cut with a knife. Surplus single-sided corrugated cardboard, the next production with the same width, the same quality of the base paper, in the transport bridge and the new single-sided corrugated cardboard bonded good use.
In addition, it is true that there is a surplus of paper parking, can be manually rewinding to the same specifications of the quality of the large reel.
5) Try to avoid frequent boot, can effectively eliminate the paper, tile paper unbonded part.
2, conveying over the bridge
1) over the bridge on the single cardboard pile amount is too much, the dryer speed is too fast or suddenly accelerated after tearing and bonding is not strong.
The operator of the bridge should pay attention to the uniform speed of the dryer, and the start should not be too fast. Bonding the broken end, the upper lap surface should run in the direction of the cardboard, and the joint should not stop. At the same time, note that single-sided machine single-sided corrugated cardboard stack amount should not exceed one third of the bridge length.
2) when the width of single-sided corrugated board and tile paper is inconsistent, it is scraped off by the paper clamp that controls its direction.
When the width of tile paper, the two clips of cardboard should be adjusted to slightly less than the width of tile paper; When the width of jori paper is larger than that of tile paper, cut it neatly in front of the paper holder.
3) After the dryer starts up, each layer of single-sided cardboard is not aligned.
Before the dryer starts up, according to the inlet and outlet size of one side of the longitudinal trimming knife, move the single-sided cardboard holder of each layer out 2-3cm.
3, glue compound
1) According to customer requirements, ordinary box paper is used as surface paper. After the preheater, the base paper becomes brittle, and then it will be torn off in the dryer. Reduce the tension of the face paper, or manually assist in turning the web until normal.
2) into the dryer behind the paper and single-sided cardboard edge line is not even, the emergency production of paper and width is different.
First of all, when each layer of paper edge and paper head are aligned, the machine can be fed into the dryer. When the machine is fed into uneven, the speed of the dryer can be accelerated, but the uneven part has become a waste. Whether the surface paper is wider or narrower than single-sided corrugated board must be on one side.
Moreover, if the surface paper reel edge line and the paper holder clip cardboard is not on a vertical line, even if the base paper edge, paper head alignment and dryer, running a distance and uneven. In order to solve this problem, we might as well from the conveying bridge clamp cardboard side, hanging a line falling to the surface paper shaftless support from the web paper 0.5cm above the appropriate, point moving the button on the shaftless support, the edge of the surface paper and the line falling vertical.
4. Dryer
1) For some reason, the dryer stops for too long, resulting in large area of cardboard unglue, especially the three-layer board.
Try not to stop the car during production. If it is necessary to stop the car, the operator will predict the stop time according to the situation. If the car is not stopped for a short time (more than two minutes for the five-layer board and more than half a minute for the three-layer board), each layer of paper should be cut off before the gluing machine and the cardboard should be cut out of the drying path.
2) The conveyor belt of the dryer is off track, the edge of the cardboard is unglued and the adhesion is bad.
Adjusting and rectifying handwheel; When stacking, check out unqualified paperboard manual bonding.
3) the drying temperature of the dryer is too high, and the cardboard glue is degummed and broken, which is more common in three layers of cardboard and crisp inner paper.
Increase the speed of the dryer, at the same time, the appropriate amount of exhaust steam and pressure, depending on the situation, notify the gluing machine to increase the amount of gluing.
5, pressure line, horizontal and horizontal cutting
1) Press the line wheel to crush the lining and surface paper; The line pressing exceeds the allowable error.
Depending on the dry humidity of paper and cardboard, adjust the depth of press line flexibly, so that the paper indentation is clear and not broken. In addition to the size error is the line pressing wheel under the concave wheel deflection, correction can be.
2) adjust the cutting edge is not timely, resulting in lack of material, exposed cardboard, the sum of the two cutting edge is less than one centimeter common.
The left and right moving device of the slitting machine should be adjusted in time. If necessary, the conveyor can be notified to adjust the clamp to the left or right of the bridge.
3) the cross cutting knife is too blunt, the production of imported leather carton board is easy to tear the cross section.
Should be promptly polished or replaced with a new knife; The bottom knife should not be too tight to avoid hurting the knife.
Post time: Jul-10-2021