Talking about the folding of digital prints

The folding effect of digital prints is often not comparable to offset printing.

First, the toner is solidified on the surface of the paper as it fuses with heat, thus forming a graphic. These solidified toners only remain on the surface of the paper (the ink is mainly osmotic drying during offset printing), and are easily dropped due to friction during folding. This phenomenon is caused by continuous paper feeding using high-grade paper feeding. The pager is especially serious.

Second, the paper suffers from reduced moisture content, increased brittleness, and reduced strength due to high-temperature baking, and it is easily broken when folded.

Third, the electrostatic phenomenon of digital prints is rather serious and it is not conducive to correct folding of automatic folding machines.

With the improvement of the toner formula in digital printing technology, the first problem has been better solved.

For the second question, there are two measures:

1 Prior to folding, indentation treatment at the fold line first to increase its toughness;

2 Place the prints behind the salty images in the room, use the natural humidity in the air to moisturize the paper, and fold them. Of course, in the case of on-demand printing, the delivery cycle is often tight.

The feasibility of the second option will be greatly limited. For the third problem, the electrostatic problem, many hybrid folding machines use an ionized air flow system. To neutralize the static electricity carried by the paper to ensure the smooth progress of the folding.