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The use of a uniform adhesive on a single sided paper requires that all the rollers are in good working condition, parallel to each other and in the correct position, the arrangement of the guide jaws is evenly distributed across the width of the machine, and the adjustment is properly adjusted. The tip on the roll removes all of the adhesive from the paste roll gap.
Worn paste roller or rubber roller bearings will have an impact on the use of adhesives. At a certain speed, the adhesive film on the paste roller will appear alternately bright and dark. The paste gap increases with speed, which in turn damages the bearing. The damaged bearing slightly separates the squeegee and paste roller due to the hydrodynamic forces generated at the measurement interface during acceleration. When the corrugated board production line is stopped or at normal speed, feeler gaps are detected using feeler gauges on the operating side, center side and drive side. If the change in the gap exceeds the specified value, the bearings of the paste roller and the squeegee roller are worn or an unknown object is present between the two types of rollers.
The cleaning degree of the guide jaw and the lower position corrugating roller must be the same to ensure that the adhesive can be evenly distributed in the lateral direction of the single-sided machine.
The tip on the cleaning roller also affects the use of the adhesive. Most single-sided machines are equipped with self-cleaning telescopic equipment. In most cases, when the speed of a corrugated board production line increases rapidly, this effect decreases. You can lower the speed of the tip or stop it completely when it is indented.
The amount of adhesive on the double sided machine varies with the speed ratio of the base paper of the paste, the pressure of the floating roller, and the smoothness or depression of the model of the paste roller.
The heating of the paste roller also affects the use of adhesive on the double sided machine. The adhesive paste used in the paste with a higher temperature than the surrounding environment has a large amount of adhesive.
The influence of the moisture content of the core paper on the amount of binder in the single-faced machine has found that the core paper region with low moisture content has more binder than the core region with high moisture content.
The glue sticking dose is related to a large number of fluctuations. Changes in the paste gap will cause the adhesive used in the corrugated board production line to multiply. In order to ensure that the amount of a specific binder is used, periodically detecting the amount of the binder and adjusting the gap of the paste can effectively improve the amount of the binder.
It is no easy task to maintain the adhesive application system in good condition. The damaged winding device that surrounds the lower corrugating roll will cause a new paste roll to bend and rub off the entire set of paste forks. Efforts must be made to design paste rollers and squeegee mechanisms that do not accidentally become damaged due to the winding device (as on the paste unit), and to ensure that there is no damage under pressure and that the production of the single facer is automatically stopped.
Each corrugated board production line has a different paste roller/rubber speed ratio. At different corrugated board line speeds, only the amount of binder sizing is affected. In addition, different binder formulations differ in performance or "uniformity."
Measure
In order to improve the uniformity of the adhesive in the existing corrugated board production line, the following measures can be taken:
â– Keep the adhesive application system in a good mechanical condition.
â– Install the reverse winder detector on a single-sided machine to avoid damage to the squeegee and paste rollers.
â– Replace the damaged paste roller and rubber roller.
â– If the spatula does not uniformly clean the squeegee roller, determine the cause and replace it with the one previously recommended.
â– Verify that the cam drive on the single-sided paste roller is in good condition. Unless the paste roller is rotating, do not let the paste roller be next to the lower corrugating roller.
â– The single-side machine with a fixed speed ratio paste roller turning device will have more adhesives applied as the speed increases. If this creates a problem with glue or cardboard warpage, install a quick-acting paste roller drive.
â– Install adhesive consumption system on single-sided machine and paste dispenser. In order to complete the full adhesion of the cardboard, the glue gap is adjusted to ensure the specific amount of adhesive.
Cardboard warpage is one of the important issues affecting the quality of paperboard. It is caused by a variety of factors. We must grasp the reasons for the formation, find solutions, try to avoid paperboard warpage, reduce paperboard wear, and produce high-quality corrugated paperboard.
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