There are two systems in the stacker - upper stacking and lower stacking.The two systems can be mixed.

The upper stacking type is formed by stacking on a fixed conveying device installed on the ground.The output conveyor belt is constantly raised so that the output cardboard is always above the stacked cardboard.When the stacking reaches the specified height, the transfer will be interrupted. The movable base plate conveyor will move the stacking to one side of the machine, and then the stacking transfer outlet position will be lowered to the conveyor belt device and the stacked cardboard will be unloaded. Then, as the cardboard starts to pile up again, the stacking conveyor will gradually increase.

The lower stack also sends the cardboard to the top of the stacked cardboard, but the cardboard is output from a fixed conveyor to a raised/lowered conveyor station.When a stack of cardboard stacking is completed, the cardboard transfer will be interrupted, the transfer platform will be lowered to the horizontal position on the ground, the cardboard stack will be removed and the highest position under the transfer outlet will be returned.The conveyor then reloads the cardboard, and the conveyor decreases at an appropriate rate.

It is obvious that the replacement cycle of the top stack is much shorter than that of the bottom stack.If the stack of all low-gram cardboard, the time difference is more obvious.In addition, the cardboard must be raised to 2 meters above the ground between the cross cutter and the lower stacking room.Due to the limitation of lifting angle, the lower stacking room must be far away from the cross cutter.The additional conveyor belt required can also provide buffer for cardboard stacking, thus providing sufficient time for the longer stacking replacement cycle at the lower stacking place.

Therefore, the reasonable design of the double stacker should be equipped with the lower tool site for the use of the upper stack stacking and the upper tool site for the use of the lower stack stacking, because the conveyor must carry cardboard through the first stack, and the conveyor is longer.This design minimizes production line speed and can be installed on shorter machines.

In terms of triple cutter and stacker, down-stack stacking is an ideal choice for the third work station.

Continuous all batch orders can be completed by combining one or more additional stacking rooms and delivery units.Once the stacking replacement time exceeds the order running time, the conveyor can quickly move the cardboard from one room to another and back again.

The finishing of cardboard stacking can be realized by the appropriate design of stacker or the rear equipment of conveying system.If it is done on a stacker, it is easy tothe connecting cardboard to increase stability.However, keep in mind that connecting cardboard can cause problems at the pre-feeding machine.In view of this, the stacker can be set up a all under heap stacking station, the height of the stack on the roller table is less than 400 mm.It is then transferred to the second roller table in parallel or connected (if the board is short), and then transferred to the descending roller table as a whole. Stacking is formed here.

Whatever combination of stacks you use, you should pay attention to the first part of the conveyor belt after the cross cutter after order change. It is necessary to slow down the delivery speed of the cardboard of the new order and/or speed up the cardboard at the end of the last order, but the order should be clearly separated without damaging the cardboard, and the cardboard of the previous order will not be mixed into the new order cardboard.Theoretically, large bundling piles should not be formed.

Stacking conveyor belt surface should have a high friction coefficient to prevent the board slip or skew.At the same time, there should be corresponding parts to output to the stacking process of cardboard control, such as the top roller, brush, etc.The output angle of the stacking conveyor belt and the distance between it and the stacking platform should be adjusted according to the length of the cardboard, so as to prevent the gas from entering the lower part of the cardboard due to the large angle (which may cause the cardboard to bounce from the rear baffle or cause deviation), or the damage of the long cardboard due to the steep angle.Such angle adjustment is very important in the upper stacker, otherwise the cardboard contact angle will change with the increase of stacking.

Right-angle horizontal stacker

In addition, right-angle horizontal stacking can complete the horizontal discharge of cardboard, its performance is outstanding, economic and practical.But this stacking speed is very slow, and all by manual operation, suitable for low speed corrugated board production line.

Please refer to table 1 for the analysis of advantages and disadvantages of down-stack stacker, up-stack stacker and right-angle horizontal digital stacker.

Chart1：Comparative analysis on advantages and disadvantages of several stacking forms