Single Facer

The quality problems of single face  cardboard are as follows:

Warpage of cardboard

Warpage of corrugated cardboard is a very headache problem. It can seriously affect the quality of the printing process. Due to the warpage of the board, it can not be accurately positioned when entering the printing slot, resulting in imprecise overprinting, slot cutting angle depth is not consistent and can not be fine-tuned, and sometimes the surface of the board wrinkles. The reason for the warpage of single-sided corrugated cardboard is very simple, that is, the moisture content of inner and core tile base paper is not uniform or the thickness is not uniform. www.chinacartonmachine.com

If a single face cardboard is upwarped, the reason is that corrugating medium is more moisture than core paper. The reason for this is that the moisture content of the corrugated base paper is less than that of the inner core paper or the inner core paper is heavier than that of the corrugated base paper. After determining the reasons for the warpage, the cardboard warpage should be resolved separately.

When the single-sided cardboard is warped upward, the heat source of corrugated paper preheating roll on the single-sided machine can be opened, and the power supply of one or two inner paper preheating rolls can be shut down to reduce the speed of the vehicle. When warping still exists, the heat source of tile paper preheating roll (increasing the electric heating pipe, increasing the air pressure, etc.) or the wrapping angle of tile paper on the preheating roll can be increased. Tightening shaft or adjusting the position of the tightening shaft method), there is still warping, it is necessary to take the inside paper spray humidification method. The moisture content of the paper is nearly the same as that of corrugated paper.

When the single-face (see pit) cardboard is warped downward, the heat source of the corrugated paper preheating roll on the single-side machine should be closed, and the heat source of one or two inner paper preheating rolls should be opened at the same time, so as to increase the speed of the vehicle without degumming. It is necessary to increase the heat source of the inner paper preheating roll or the wrapping angle on the inner paper preheating roll when it is warped. When it is warped, the spray humidification method should be adopted to treat the corrugated base paper so that the moisture content of the tile paper is close to that of the inner paper. S-type warpage of single-sided paperboard is usually caused by unbalanced moisture distribution of the base paper. According to the warpage condition, the glue amount can be adjusted according to the warpage reason or the base paper with too low moisture can be sprayed and humidified locally. It is better to measure the moisture content of the inner (core) and tile paper respectively with a water content tester before starting the machine, and then to control the temperature of each roller for different moisture content. Generally speaking, when the cardboard is off the machine, keep it slightly upward (tile) warping, and take the positive and negative stacking method, about an hour later, the cardboard will be completely flat.

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