Ways to reduce the problem of falling powder on paper sheets

Falling out of powder is a serious paper problem in printing.

The mechanism of the occurrence: The bonding strength of the surface of the paper sheet is not enough. The bonding strength of the fiber and the filler is poor (binding of the sheet surface refers to the binding force of fiber fragments, fillers, and rubber materials); the fibers and fillers on the paper surface are stuck by the ink at the time of printing; Printing plate type, resulting in paste version, on the other hand ink transfer to the ink contamination of the ink, so that the paper page printed around the white circle of ink, affecting the print quality, paper paper powder accumulation, the need to stop brush version, reduce efficiency .

Reduce the way:

1. Appropriately increase the proportion of long fibers, improve the paper fiber binding effect, increase the strength of the paper sheet and increase the peel resistance

2. Reasonably control the beating process conditions, use high-strength beating fiber to fully swell, maintain the length softly, and increase the degree of fiber internal and external fine fiber

3, to improve the forming conditions of the paper sheet, PH value close to neutral to improve the sizing effect on the Internet, in addition to increase the Internet concentration can also improve the bonding strength of paper

4, reduce the amount of filler, use neutral sizing and surface sizing, add dry strength agent

5. Improved press section and calender section. Composite press removes small fiber fragments with poor bonding from both sides of the paper to avoid potential hair loss. Reasonable water control in the calender zone, or use of controllable high rollers to improve smoothness Degree of surface strength

6. Reasonably control the drying curve The initial temperature is not too high

In addition, we must pay attention to the control of the printing operation conditions