Printing - Husson Inc. – Industrial Humidification



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	Printing

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Moisture content of paper (PDF)

Printing is one of the industries most affected by low relative humidity problems. As a result, many printing plants have installed humidification systems for years. Existing older steam or compressed air systems are being increasingly replaced by newer, more efficient and cost effective high pressure humidification systems.

Most problems faced by printers in North America are seasonal, occurring especially in winter, when plant air is heated, and relative humidity can drop to 10% RH or even less.

Ideal conditions for printing are 45%-55% RH
at 68°F-72°F

Because problems are seasonal, they are often misdiagnosed, with printers at times blaming a bad batch of paper, press chemistry, machinery or other problems.

Sheet Separation

Static electricity causes paper to stick together and the feeder can’t separate sheets. The press takes the double sheet, leading to misfeeds, jams and press stops. Sheet separation problems can also cause “haystacking” in the jogger. This problem is particularly pronounced with the use of lower basis weight materials.

Edge Tightening

Loss of moisture from uncovered edges of stored paper and board cause edges to warp or curl. Grippers can’t pull the material through the press, folders or die-cutters properly, leading to jamming and folding, press stops downtime and paper waste.

Dimensional Changes

Paper and board shrinkage, especially in the width, causes a multitude of problems, especially in registration and in trimming and die-cutting operations.

Fountain Solution

Fountain solution is sucked up by dry paper. Fountain solution use is increased 10%-20%, leading to frequent re-sets and inconsistent print quality

Ink Problems

Dry paper also sucks up extra ink, leading to quality problems and sky-high ink costs; more stops, tweaking and downtime, paper waste and delivery problems

Flexibility and Folding

Paper and board are most flexible at 50%-65% RH. Dry material often breaks during scoring, folding and cutting, causing bindery and die-cutting problems and the releasing dust. Glue application and holding power become inconsistent.

Printing

Guidelines for humidification in
the graphic arts
Here are some impor-tant things to consider in the decision-making process as you compare options.


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