Printing Press Folding on Folders, Die Cutters, or Printing Presses

This condition usually occurs when the press operates in the direction of the corrugation.
The reason is due to the surface paper, the core paper, the low humidity, the operation of the tile line, or part of the downstream processing machine.

Cause 1 Air Relative Humidity Causes Measures Relative humidity in the shop floor is low. If the humidity is relatively low, the cardboard should be processed within 8 hours after the relatively low temperature (5 to 25% RH) of the board is produced.
In 2:2, the corrugated board will dry out within 1 hour. If this happens every year, and the monthly-duration is longer than the relatively low relative humidity of indoor air, it should be considered that artificially increasing humidity often occurs in the northern regions. When the outside air is heated to the normal operating temperature, the internal humidity often becomes very low. Dryer corrugated cardboard will be more easily crushed when pressed than cardboard with normal humidity (40 to 60% RH).
Process cardboard or maintain humidity in the board before board board humidity decreases, or try to maintain humidity after corrugated boards are produced.
The efforts made in these measures sometimes do not solve the problem. Because many paperboard squashing problems are often related to the quality of the paper.
Causes of two-wire operating conditions Cause Remedy Water loss caused by tile operation.
Minimize preheater wrap angles for single-sided machines and double-sided machines
Move moisture to paste line Fully use preheater sprinkler, use saturated steam hot plate and other components:
Minimize the number of platen rollers, or reduce the effect of AC hot plate weight or mechanical stress. Operate tile lines as fast as possible. Note: When performing tile-line operation adjustments to maintain humidity, the quality of the board must be taken into account [ 1 exercises, especially warp or loose paper.
If the humidity in the workshop is low, water will start to run out as soon as the cardboard comes down from the tile line. Therefore, the formed cardboard should be processed within 8 hours so as to minimize the loss of water.