AMCO direct spray high-pressure humidification systems control the plants RH. Paper receives and loses moisture readily as the surrounding humidity changes. A moisture content of 5% to 7% provides suitable strength and workability. To achieve this moisture content, a RH of 40% to 50% must be maintained.

Recommended Relative Humidity Levels

Material
Description
Relative Humidity %
10
20
30
40
50
60
70
80
90
M.F. Newsprint Wood Pulp
(24% ash)
2.1
3.2
4.0
4.7
5.3
6.1
7.2
8.3
10.8
H.M.F. Writing Wood Pulp
(3% ash)
3.0
4.2
5.2
6.2
7.2
7.3
9.9
11.9
14.2
White
Bond 		Rag
(1% ash)
2.4
3.7
4.7
5.5
6.5
7.5
8.8
10.8
13.2
Comm,
ledger 		75% rag
(1% ash)
3.2
4.2
5.0
5.6
6.2
6.9
8.1
10.3
13.9
Kraft Wrapping Coniferous
3.2
4.6
5.7
6.6
7.6
8.9
10.5
12.6
14.9

Benefits
Eliminates static electricity and decreases or eliminates curl and warping.
Increases flexibility and dimensional stability through EMC.
Increases productivity with higher speeds and decreases rejects.
Improves sheet separation.

Enables better ink transfer and enhances ink and glue chemistry balance.

Aids in dust suppression and produces evaporative cooling.

Improves conditions of workplace and reduces heat load through evaporative cooling.