Converting - Husson Inc. – Industrial Humidification



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	Converting

Husson Products & Services (PDF)

GPI, Inc. Case Study (PDF)

Humidity Control Improves Productivity
- Rock-Tenn (PDF)

The Rx for RH (PDF)

Consistent scoring, folding, die-cutting and stock cutting play a vital role in converting operations. Maintaining and improving the flexibility of paper, paperboard and other substrates through humidity control is almost always a crucial issue. Application of glues and their holding power can also be affected by low RH levels. Because of the crucial role printing plays in converting plants, the industry shares many humidity control concerns and production issues with commercial and screen printers.

An ideal climate for printing and converting
is 45%-55% RH at 68°F-72°F.

Most low relative humidity problems faced by converters occur during the winter heating season, when winter air is heated from winter conditions to typical indoor temperatures. Relative humidity often drops to single-digit percentages, far below the amount of humidity needed to keep paper and other materials conditioned, flat, wrinkle-free and flexible. And as in many industries, static electricity can be a problem, causing pressroom and die-cutting problems like double-sheeting and “haystacking” in the jogger.

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.

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.

Converting


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