TEMPERATURE / HUMIDITY CONDITIONING
In striving to achieve maximum quality out of a printing project, paper should always be ordered with enough lead time to allow it to acclimatize to the environment of the pressroom. Differences in temperature and humidity between the pressroom and the paper can cause problems that may prove difficult to overcome. Paper unwrapped while cold will quickly become wavy because the paper’s low temperature chills the air, and the unprotected edges of the paper rapidly take on moisture. As the temperature of the paper rises, this additional moisture will in part be given off, but in the process the moisture content of the paper at the edges will not return to the same moisture content as the balance of the sheets. Waviness created by unwrapping cold skids in a warm pressroom can not be entirely removed.
In addition, we highly recommend the practice of covering the stock with a skid cover between passes. This creates a much smaller environment that the paper can react to and allows the center and edges of the sheet to equalize.
    
VOLUME OF PAPER SKIDS AND CARTONS
 
Degrees
F
Degrees
C
6 Cubic Feet
12 Cubic Feet
24 Cubic Feet
48 Cubic Feet
96 Cubic Feet
10°
15°
20°
25°
30°
40°
50°
60°
5.6°
8.3°
11.1°
13.9°
16.7°
22.2°
27.8°
33.3°
5 hrs.
9 hrs.
12 hrs.
15 hrs.
18 hrs.
25 hrs.
35 hrs.
54 hrs.
8 hrs.
14 hrs.
18 hrs.
22 hrs.
27 hrs.
38 hrs.
51 hrs.
78 hrs.
11 hrs.
16 hrs.
23 hrs.
28 hrs.
35 hrs.
48 hrs.
67 hrs.
100 hrs.
14 hrs.
19 hrs.
26 hrs.
32 hrs.
38 hrs.
54 hrs.
75 hrs.
109 hrs.
15 hrs.
20 hrs.
27 hrs.
34 hrs.
41 hrs.
57 hrs.
79 hrs.
115 hrs.
Hours paper should stand unopened in order to come in balance with room temperature.
Difference in temperature of room in which paper is to be opened and the paper on arrival.
 
NOTE: To determine cubic feet of volume, multiply length x width x height in inches and divide by 1728.
 
 










   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
     

 

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