The single-faced corrugating machine is the heart of the corrugated board production line. How to ensure that the single-face corrugated board meets the quality requirements has been widely concerned.
The quality problems of single-sided corrugated board are mainly:
Insufficient cylinder pressure. Or the pressure is high and low. The paper with low pressure will wrinkle.
The surface temperature distribution of each heating roller is too large.
The paper axial temperature difference is too large. The temperature is high and low. The paper at the lower temperature will wrinkle.
The corrugating roller and the pressure roller are not parallelized at both ends, and the gap is large (the pressure is small) and the paper is wrinkled.
Tile paper is too moist or uneven.
The paper holder and the single-faced corrugating machine (main unit) are not installed in parallel or have a high level. When you feed the paper, it is loose and tight. The brakes are too loose and the paper has no tension.
Crease or burst
The brakes are too tight and the paper is too strong.
The height of the front and rear of the main body is high and low, so that the corrugating rolls are warped, so that the corrugating rolls are not parallel. Generally speaking, it is because the rear level of the body is too low.
Side rupture - corrugating rolls are not parallel.
The top surface is broken - the paper is too strong and the brakes are too tight.
Fragmentation - (1) The preheating temperature is too high or the paper is too dry. (2) The corrugating roller pressure is too large. (3) The tile brake is too tight.
Deep cracks appear on the paper guide
The cause is that the gap of the paper guide is too small or improperly installed, and the lower portion is deformed.
Sometimes it appears at one end or both ends, sometimes in the middle, and grows in a short groove shape. In severe cases, the corrugated flat groove runs through the entire width of the paper from left to right.
Causes: Mainly because the gap of the paper guide is too small (the thickness of the paper exceeds the gap between the paper guide and the corrugating roller), or the length and position are not correct, so that the tips of the two ends of the paper guide are pressed against the corrugating roller, and the paper passes through. It was blocked. The arc of the paper guide is inconsistent with the arc of the corrugating roller, and it is impossible to ensure that the gap between the paper guide and the corrugating roller is the same from top to bottom during installation.
The portion of the paper guide that is embedded in the upper corrugating roller is broken, and the tip of the yarn breaks the corrugated paper, which is also caused by the obstruction of the paper.
The speed ratio of the pinch roller to the lower corrugating roller is incorrect or the gear is improperly installed.
This phenomenon occurs in the joint part of the paper.
This phenomenon occurs when the paper is too moist or the water is unevenly distributed or the fibers are uneven.
The corrugated rolls are not parallel at both ends, and the pressure of the corrugated flat is too large.
The rubber roller and the lower corrugating roller are not parallel adjusted, and the gap between the corrugated flat is too small.
The reason is that the temperature at both ends is lower than the middle.
The cardboard regains moisture after being piled for a period of time.
Causes: When the cardboard is off machine, it is too dry. It absorbs moisture in the air during stacking. The moisture content of the cardboard should be kept at 10%~l2%.
Adhesive formula can be adjusted if the binder water ratio is too high or no reinforcing agent is added.
The amount of glue attached is too large to be adjusted. The cause of the glue is not decomposed. The viscosity of the adhesive is too high. The compression rubber block on the rubber roller is worn or loose, causing the gap to be too large.
The uniform roller adjusts the screw to bite and adjusts the malfunction.
If this happens in a few places, the gap between the paper guide is too large or the position is not installed correctly. You can loosen the paperboard and stick the corrugated roller. If it is serious, it will not pull down.
The glue roller is too thick or the glue is too thin or the corrugated base paper is too thin and the fiber is too loose, so that the glue easily penetrates the corrugated paper and adheres to the corrugating roller.
The gap between the applicator roller and the lower corrugating roller is too small.
The rubber roller was pressed too early when the machine was turned on, and the corrugated roller was glued.
When the above phenomena occur, first clean the corrugated roller with diesel, and then analyze the cause and then eliminate the symptom.
Corrugated cardboard is too soft
The temperature is too low and the speed is too fast.
The glue water ratio is too high and the starch solid content is too low. The amount of glue applied is too large. (can not exceed 20 grams per square meter) Poor adhesion.
When the above phenomena occur, the glue formula must be adjusted to reduce the water ratio and increase the starch solid content. At the same time, reinforcing agents can be used to increase the strength of the paperboard.
The paper is not sucked at both ends during vacuum adsorption.
The vacuum pump power is too low.
Corrugated paper is too moist.