TIP 0404-07( Paper Machine Dry Rate)
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TIP 0404-07 OLD TIP NO. 014- 17 ISSUED – 1970 REVISED – 1984 REVISED – 1989 REVISED – 1991 REVISED – 1994 REVISED – 2000 REVISED – 2004 REVISED - 2005 REVISED - 2010 © 2010 TAPPI The information and data contained in this document were prepared by a technical committee of the Association. The committee and the Association assume no liability or responsibility in connection with the use of such information or data, including but not limited to any liability or responsibility under patent, copyright, or trade secret laws. The user is responsible for determining that this document is the most recent edition published.
Paper Paper machine dry ing rate Scope This TIP outlines procedures for calculating paper machine drying rates for coated and uncoated papers and provides drying rate curves. The objective objective of the TIP is to define rate of water removal on a common basis for mills to use to compare a particular machine to past performance and to other machines. The definition of drying rate and its calculation are simple to permit widespread use. These procedures cannot be used for machines with auxiliary drying equipment such as infrared dryers and impingement dryers unless these auxiliary dryers are shut off. Data points on the curves represent observed performance of existing machines. Lines represent calculated average and two-sigma variation of plotted data. The calculation does not identify or account for factors that affect drying rate. There are many variables that can affect calculated drying rate. These factors include: • Sheet furnish • Siphon design • Use of dryer bars • Pocket ventilation • Dryer fabric application
• Dryer configuration • Dryer felting • Dryer surface scale • Hood humidity • Reel moisture content
• Type of pressing • Amount of pressing • Breaker stack
Safety Safety p recautions This TIP outlines a calculation procedure. No safety precautions are required.
Definition Definition o f drying rate The drying rate ( RW ) as applied to drying on the machine is defined as the amount of water evaporated per hour per unit area of drying surface. Drying surface is defined as the total circumferential length of steam-heated dryers that are in contact with the sheet multiplied by the width of the sheet at the reel. Drying rate is expressed as pounds per hour per square foot in customary units and as kilograms per hour per square meter in SI units, and reported at the average steam temperature.
TIP Category: Automatically Periodically Reviewed (Five-year review)TAPPI
TIP 0404-07
Paper machin e dryi ng rate / 2
Drying rate for unc oated papers Equations 1 and 2 are used to calculate the drying rate for uncoated papers:
M =
L E
−1
RW = 60
(1)
SBM
(2)
NAπ D
where the factor 60 is minutes per hour and the variables are defined as: RW S B M N A
π D L E
drying rate, amount of water evaporated, kg/h•m2 (lb/h•ft2) machine speed, m/min (ft/min) basis weight of the sheet as it leaves the dryer section as dried (wet basis), kg/m2 (lb/ream) weight of water evaporated per unit weight of paper as dried (wet basis) number of steam-heated dryers that contact the sheet area of standard ream, 1.0 m2 (ft2) 3.1416 diameter of dryer cylinders, m (ft) percent dryness (wet basis) of sheet leaving the last cylinder (the larger number) percent dryness (wet basis) of sheet entering on the first dryer (the smaller number).
= = = = = = = = = =
Dryers that do not contact the sheet include bottom unorun dryers, top dryers of inverted unorun sections, felt dryers, and Feeney dryers. Dryers that are not heated include cooling dryers, sweat dryers, and dryers that are valved off. None of these dryers should be counted in the number of dryers. An accurate value for the dryness “E” of the web entering a dryer section must be available in order to calculate the drying rate. An error of 2% dryness (say 38% dry instead of 40% dry) can result in a 9% error in the calculated drying rate. The entering dryness often is not readily available, is difficult to determine accurately, and is a cause of inaccurate rate calculations. The dryness can be determined by carefully taking and testing samples of the wet web before the dryer section, according to TIP 0404-01. Pulp air dryers do not have dryer cylinders. Area used in these drying rate calculations multiply the length of a dryer pass times the number of passes times the sheet width off the machine. An example of these equations is given in both customary and SI units as follows: Customary units S = B = L = E = A = N = D =
M =
94 40
RW = 60
2000 ft/min 43 lb/ream 94% dry leaving 40% dry entering 3300 ft2/ream 45 paper dryers 5.0 ft diameter
− 1 = 1.35 ( 2000)(43)(1.35) ( 45)(3300)π (5.0)
RW = 3.0 lb water/h/ft
2
3 / Paper machin e dryi ng rate
SI units S B L E A N D
M =
94 40
RW =
RW
= = = = = = =
TIP 0404-07
610 m/min (63.6/1000) kg/m2 94% dry leaving 40% dry entering 1.0 45 paper dryers 1.52 m diameter
− 1 = 1.35
60(610)(63.6 / 1000)(1.35) (45)(1.0)π (1.52) =
14.6 kg water/h/m2
Drying rate comparison Calculated drying rate can be compared to other paper machines by referring to the following Fig.s: Fig. 1E Fig. 1M Fig. 2E Fig. 2M Fig. 3E Fig. 3M Fig. 4E Fig. 4M Fig. 5E Fig. 5M Fig. 6E Fig. 6M Fig. 7E Fig. 7M Fig. 8E Fig. 8M Fig. 9E Fig. 9M Fig. 10E Fig. 10M Fig. 11E Fig. 11M Fig. 12E Fig. 12M
Corrugating Medium (English units) Corrugating Medium (metric units) Woodfree printing and writing (English units) Woodfree printing and writing (metric units) Linerboard (English units) Linerboard (metric units) Bleached board (English units) Bleached board (metric units) Newsprint (English units) Newsprint (metric units) Kraft papers (English units) Kraft papers (metric units) Wood-containing paper (English units) Wood-containing paper (metric units) After-size press drying (English units) After-size press drying (metric units) Pulp (cylinder dryers) (English units) Pulp (cylinder dryers) (metric units) Pulp (air dryers) (English units) Pulp (air dryers) (metric units) Paperboard (English units) Paperboard (metric units) Gypsum wallboard (English units) Gypsum wallboard (metric units)
Fig.s 13E (English units) and Fig. 13M (metric units) show average curves for all machines listed above. Saturated steam temperatures are shown in Table 1 (English units) and Table 2 (metric units). Calculated drying rate and average steam temperature establish a point on the appropriate drying rate curve. The average steam temperature used for these comparisons is the average saturation steam temperature, weighted for the number of dryers operating at the respective temperatures, as follows:
TIP 0404-07
T avg =
1
Paper machin e dryi ng rate / 4
N
∑ (T )
N i =1
i
(3)
where: Tavg Ti N
= = =
average saturation steam temperature, °C (°F) saturation steam temperature of dryer (i), °C (°F) number of steam-heated dryers that contact the sheet
Saturation steam temperatures can be determined from measured dryer steam pressures using common steam tables (1, 2). Abbreviated excerpts from these references are included in this TIP. Note that a weighted average steam pressure is not necessarily equal to the corresponding weighted average steam temperature. This is because steam pressure and steam temperature are not linearly related. Also note that the temperature of the saturated steam in the dryer is higher than the temperature of the condensate leaving the dryer. This is because the pressure inside the dryer is higher than the discharge pressure.
Drying rate for c oated papers Equations 1 and 2 can also be used to compute the drying rate for coated papers. However, entering dryness E must generally be calculated from information on coating weight and moisture, while reel basis weight B can be either used directly or computed from the raw stock basis weight. The equations for these calculations are as follows: B =
Bc ( P / 100) + W
( L / 100)
⎡ Bc (1 − P ) + W (100 − 1) ⎤ 100 C ⎥ E = 100 − 100⎢ (100W ) ⎢ ⎥ B + c C ⎣ ⎦
(4)
(5)
in which the variables are defined as: Bc W P C
= = = =
basis weight of the sheet entering the coater (wet basis), kg/m2 (lb/ream) dry coating weight applied, kg/m2 (lb/ream) percent dryness of sheet entering the coater percent coating solids in coating solution as applied to the sheet (wet basis).
Equations 4 and 5 can also be used to calculate the drying rate after a size press, where W is the dry weight per ream of the starch picked up and C is the percent starch solids in the size solution. An example of these equations follows in both customary and SI units: Customary units S Bc L P A D N W C
= = = = = = = = =
2000 ft/min 43 lb/ream into coater (includes moisture) 96% dryness (fiber and coating) leaving the dryer section 94% dry (wet basis) entering the coater 3300 ft2/ream 5.0 ft diameter 6 coater dryers 8 lb of dry coating applied per ream 60% coating solids
5 / Paper machin e dryi ng rate
94 ⎡ 43(1 − 100 − 1) ⎤ ) + 8( 100 60 E = 100 − 100⎢ ⎥ (100 (8) 43 + 60 ⎣⎢ ⎦⎥
=
E
B =
86% solids (fiber and coating) entering the dryer section
43(94 / 100) + 8 (96 / 100)
B
=
50.4 lb/ream out of dryer section as dried
M M
= =
(96/86) – 1 0.116 lb water evaporated per lb coated paper (wet basis)
RW = 60
Rw
( 2000)(50.4)(0.116) (6)(3300)π (5.0)
=
2.26 lb water evaporated/h/ft2
= = = = = = = = =
610 m/min 63.6/1000 kg/m2 into coater (includes moisture) 96% solids (fiber and coating) leaving the dryer section 94% solids (fiber and coating) entering the coater 1.0 1.52 m diameter 6 coater dryers 11.8/1000 kg/m2 of dry coating applied 60% coating solids
SI units S Bc L P A D N W C
94 ⎡ 63.6(1 − 100 ) + 11.8( 100 − 1) ⎤ 60 E = 100 − 100⎢ ⎥ (100(11.8) 63.6 + 60 ⎢⎣ ⎥⎦
E
B =
=
86% solids (fiber and coating) entering the dryer section
(63.6 / 1000)(94 / 100) + (11.8 / 1000) (96 / 100)
TIP 0404-07
TIP 0404-07
Paper machin e dryi ng rate / 6
B
=
(74.6/1000) kg/m2 out of dryer section as dried
M M
= =
(96/86) – 1 0.116 kg water evaporated per kg coated paper (wet basis)
RW = 60
Rw
(610)(74.6 / 1000)(0.116) (6)(1.0)π (1.52)
=
11.1 kg water evaporated/h/m2
Keywords Dryers, Drying, Computation, Water removal, Corrugating medium, Linerboard, Wood free papers, Free sheet, Printing papers, Writing papers, Fine papers, Bleached board, Newsprint, Kraft papers, Bags, Mechanical papers, After dryers, Pulps
Ad di ti on al inf or mat io n This revision of TIP 0404-07 incorporates the drying rate curves from the following former TIPs (now withdrawn): TIP 0404-08, TIP 0404-09, TIP 0404-12, TIP 0404-14, TIP 0404-15, TIP 0404-16, TIP 0404-40, TIP 0404-42, and TIP 0404-56. Effective date of issue: April 30, 2010 Working Group: Jeff Reese, Chairman, International Paper Rejean Audet, AstenJohnson Joel Cason, Albany International Al Genereux, AstenJohnson Ken Hill, Kadant Johnson Pekka Kormano, Deublin Corp. Dick Reese, Dick Reese and Associates Stacy Sharp, Voith Greg Wedel, Kadant Johnson
Literature cited 1.
Steam Tables. Thermodynamic Properties of Water Including Vapor, Liquid, and Solid Phases (English Units), Keenan, J. H., Keyes, F. G., Hill, P. G., and Moore, J. G., John Wiley & Sons, New York, 1969.
2.
Steam Tables. Thermodynamic Properties of Water Including Vapor, Liquid, and Solid Phases (International System of Units — S. I.), Keenan, J. H., Keyes, F. G., Hill, P. G., and Moore, J. G., John Wiley & Sons, New York, 1978.
7 / Paper machin e dryi ng rate
TIP 0404-07
Table 1. Saturated steam temperatures (English units). Press. (psia) 1
°F 101.70
Press. (psia) 41
2 3 4 5
126.04 141.43 152.93 162.21
6 7 8 9
°F 268.76
Press. (psia) 81
42 43 44 45
270.22 271.66 273.07 274.46
170.03 176.82 182.84 188.26
46 47 48 49
10 11
193.19 197.73
12 13 14 15 16
°F 312.93
Press. (psia) 121
°F 341.93
82 83 84 85
313.78 314.62 315.46 316.29
122 123 124 125
342.55 343.17 343.78 344.39
275.82 277.16 278.47 279.76
86 87 88 89
317.11 317.92 318.72 319.52
126 127 128 129
344.99 345.59 346.19 346.78
50 51
281.03 282.28
90 91
320.31 321.10
130 131
347.37 347.96
201.94 205.87 209.55 213.03 216.31
52 53 54 55 56
283.52 284.73 285.92 287.10 288.26
92 93 94 95 96
321.87 322.64 323.41 324.16 324.91
132 133 134 135 136
348.54 349.12 349.70 350.27 350.84
17 18 19 20
219.43 222.40 225.24 227.96
57 58 59 60
289.40 290.53 291.64 292.73
97 98 99 100
325.66 326.40 327.13 327.86
137 138 139 140
351.40 351.97 352.53 353.08
21 22
230.57 233.08
61 62
293.81 294.88
101 102
328.58 329.29
141 142
353.63 354.18
23 24 25 26
235.49 237.82 240.08 242.26
63 64 65 66
295.93 296.98 298.00 299.02
103 104 105 106
330.00 330.71 331.41 332.10
143 144 146 148
354.73 355.28 356.35 357.42
27 28 29 30
244.37 246.42 248.41 250.34
67 68 69 70
300.02 301.01 301.99 302.96
107 108 109 110
332.79 333.47 334.15 334.82
150 152 154 156
358.48 359.52 360.56 361.58
31 32 33 34 35
252.23 254.06 255.85 257.59 259.30
71 72 73 74 75
303.91 304.86 305.79 306.72 307.63
111 112 113 114 115
335.49 336.16 336.81 337.47 338.12
158 160 162 164 166
362.59 363.60 364.59 365.58 366.55
36 37 38 39 40
260.96 262.59 264.18 265.74 267.26
76 77 78 79 80
308.54 309.44 310.32 311.20 312.07
116 117 118 119 120
338.77 339.41 340.04 340.68 341.30
168 170 172 174 176
367.52 368.47 369.42 370.36 371.29
TIP 0404-07
Paper machin e dryi ng rate / 8
Table 2. Saturated steam temperatures (S. I. units). Press. (kPa) 10 15 20 25 30
°C 45.81 53.97 60.06 64.97 69.10
Press. (kPa) 210 215 220 225 230
35 40 45
72.69 75.87 78.73
50 55
°C 121.78 122.53 123.57 124.00 124.71
Press. (kPa) 420 430 440 450 460
235 240 245
125.41 126.10 126.77
81.33 83.72
250 255
50 65
85.94 88.01
70 75
°C 145.40 146.26 147.10 147.93 148.74
Press. (kPa) 820 830 840 850 860
°C 171.46 171.97 172.47 172.96 173.46
470 480 490
149.54 150.32 151.10
870 880 890
173.94 174.43 174.90
127.44 128.09
500 510
151.86 152.60
900 910
175.38 175.85
260 265
128.73 129.37
520 530
153.34 154.06
920 930
176.31 176.78
89.95 91.78
270 275
129.99 130.60
540 550
154.78 155.48
940 950
177.24 177.69
80 85
93.50 95.14
280 285
131.21 131.81
560 570
156.17 156.86
960 970
178.14 178.59
90 95 100 105
96.71 98.20 99.63 101.00
290 295 300 305
132.39 132.97 133.55 134.11
580 590 600 610
157.53 158.20 158.85 159.50
980 990 1000 1020
179.03 179.47 179.91 180.77
110 115 120 125
102.31 103.58 104.80 105.99
310 315 320 325
134.67 135.22 135.76 136.30
620 630 640 650
160.14 160.77 161.39 162.01
1040 1060 1080 1100
181.62 182.46 183.28 184.09
130
107.13
330
136.83
660
162.61
1120
184.89
135 140
108.24 109.31
335 340
137.35 137.87
670 680
163.21 163.81
1140 1160
185.68 186.46
145 150
110.36 111.37
345 350
138.38 138.88
690 700
164.39 164.97
1180 1200
187.23 187.99
155 160
112.36 133.32
355 360
139.38 139.87
710 720
165.55 166.11
1220 1240
188.74 189.48
165 170
114.26 115.17
365 370
140.36 140.84
730 740
166.67 167.23
175 180
116.06 116.93
375 380
141.32 141.79
750 760
167.78 168.32
185 190
117.79 118.62
385 390
142.26 142.72
770 780
168.86 169.39
195 200
119.43 120.23
395 400
143.18 143.63
790 800
169.91 170.43
205
121.02
410
144.53
810
170.95
9 / Paper machin e dryi ng rate
TIP 0404-07
TAPPI Drying Rate ‐ Corrugating Medium 8.00
7.00
) a e r a e c a f r 6.00 u s r e y r d t 5.00 f q s / r h / d e t a 4.00 o r p a v e r e 3.00 t a w b l ( e t a R 2.00 g n i y r D
1.00
0.00 260
280
300
320
340
360
380
Average Steam Temperature (°F)
Fig. 1E.Corrugating medium (English units)
TAPPI Drying Rate - Corru gating Medium - Metric 40.00
35.00
) 30.00 m q s / r 25.00 h / r e t a w g20.00 k ( e t a R15.00 g n i y r D10.00
5.00
0.00 120.0
130.0
140.0
150.0
160.0
170.0
Aver age St eam Te mp erat ur e (deg C)
Fig. 1M. Corrugating medium (metric units)
180.0
190.0
200.0
TIP 0404-07
Paper machin e dryi ng rate / 10
TAPPI Drying Rate - Woodfree Printing and Writing 10.00
9.00
8.00
7.00 ) t f q s 6.00 / r h / b l ( 5.00 e t a R g 4.00 n i y r D3.00
2.00
1.00
0.00 200
220
240
260
280
300
320
340
Aver age St eam Temp erat ur e (deg F)
Fig. 2E.Woodfree printing and writing (English units)
TAPPI Drying Rate - Woodfree Fine Paper - Metri c 50.0
45.0
40.0
) m 35.0 q s / r h /30.0 r e t a w 25.0 g k ( e t 20.0 a R g n i 15.0 y r D 10.0
5.0
0.0 90.0
100.0
110.0
120.0
130.0
140.0
150.0
160.0
170.0
Aver age St eam Tem per atu re (d eg C)
Fig. 2M. Woodfree printing and writing (metric units)
180.0
190.0
360
11 / Paper machin e dry ing rate
TIP 0404-07
TAPPI Drying Rate - Linerboard 9.00
8.00
7.00 ) t f q 6.00 s / r h / r e t 5.00 a w b l ( e 4.00 t a R g 3.00 n i y r D 2.00
1.00
0.00 270
290
310
330
350
370
390
Aver age St eam Tem per atu re (d eg F)
Fig. 3E. Linerboard (English units)
TAPPI Drying Rate - Linerb oard - Metric 45.0
40.0
35.0 ) m q s 30.0 / r h / r e t a25.0 w g k ( 20.0 e t a R g15.0 n i y r D 10.0
5.0
0.0 130.0
140.0
150.0
160.0
170.0
Aver age St eam Tem per atur e (deg C)
Fig. 3M. Linerboard (metric units)
180.0
190.0
200.0
TIP 0404-07
Paper machin e dryi ng rate / 12
TAPPI Drying Rate - Bleached Bo ard 7.00
6.00
) t f 5.00 q s / r h / r e 4.00 t a w b l ( e 3.00 t a R g n i y 2.00 r D
1.00
0.00 230
250
270
290
310
330
350
370
Aver age St eam Tem per atu re (d eg F)
Fig. 4E. Bleached board (English units)
TAPPI Drying Rate - Bleached B oard - Metric 35.0
30.0
) m 25.0 q s / r h / r e20.0 t a w g k ( e15.0 t a R g n i y r10.0 D
5.0
0.0 110.0
120.0
130.0
140.0
150.0
160.0
Aver age St eam Tem per atu re (d eg C)
Fig. 4M. Bleached board (metric units)
170.0
180.0
190.0
13 / Paper machin e dry ing rate
TIP 0404-07
TAPPI Drying Rate - Newsprint 7
6
) t f q s / r h / r e t a w b l (
e t a R g n i y r D
5
4
3
2
1
0 210
220
230
240
250
260
270
280
Aver age St eam Temp erat ur e (deg F)
Fig. 5E. Newsprint (English units)
TAPPI Drying Rate - Newsprint - Metric 35.0
30.0
) m25.0 q s / r h / r e20.0 t a w g k ( e15.0 t a R g n i y r 10.0 D
5.0
0.0 95.0
105.0
115.0
125.0
135.0
Aver age Steam Temper atur e (deg C)
Fig. 5M. Newsprint (metric units)
145.0
290
300
TIP 0404-07
Paper machin e dryi ng rate / 14
TAPPI Drying Rate - Kraft Paper 10.00
9.00
8.00 ) t f q s / r h / r e t a w b l ( e t a R g n i y r D
7.00
6.00
5.00
4.00
3.00
2.00
1.00
0.00 230
250
270
290
310
330
350
370
Aver age St eam Tem per atur e (deg F)
Fig. 6E. Kraft papers (English units)
TAPPI Drying Rate - Kraft Paper - Metric 45.00
40.00
35.00 ) m q s 30.00 / r h / r e t 25.00 a w g k ( 20.00 e t a R g 15.00 n i y r D 10.00
5.00
0.00 110.0
120.0
130.0
140.0
150.0
160.0
Aver ageSt eam Tem per atu re (d eg C)
Fig. 6M. Kraft papers (metric units)
170.0
180.0
190.0
15 / Paper machin e dry ing rate
TIP 0404-07
TAPPI Drying Rate - Wood-Containi ng Paper 7.00
6.00
) t f 5.00 q s / r h / r e 4.00 t a w b l ( e 3.00 t a R g n i y 2.00 r D
1.00
0.00 210
220
230
240
250
260
270
280
290
300
310
Aver age St eam Temp erat ur e (deg F)
Fig. 7E. Wood-containing paper (English units)
TAPPI Drying Rate - Wood-containing Paper - Metric 35.0
30.0
) m25.0 q s / r h / r e20.0 t a w g k ( e15.0 t a R g n i y 10.0 r D
5.0
0.0 90.0
100.0
110.0
120.0
130.0
140.0
Aver age St eam Temp erat ur e (deg C)
Fig. 7M. Wood-containing paper (metric units)
150.0
160.0
TIP 0404-07
Paper machin e dryi ng rate / 16
TAPPI Drying Rate - After-Size Dryers 10.00 9.00 8.00 ) t f q s / r h / r e t a w b l ( e t a R g n i y r D
7.00 6.00 5.00 4.00 3.00 2.00 1.00 0.00 200
220
240
260
280
300
320
340
Aver age Steam Temper atur e (deg F)
Fig. 8E. After-size press drying (English units)
TAPPI Drying Rate - After-si ze Dryers - Metri c 50.0
40.0
) m q 30.0 s / r h / r e t a w 20.0 g k ( e t a R 10.0 g n i y r D 0.0 90.0
100.0
110.0
120.0
130.0
140.0
150.0
160.0
-10.0
Averag e Steam Temp eratu re (deg C)
Fig. 8M. After-size press drying (metric units)
170.0
180.0
17 / Paper machin e dry ing rate
TIP 0404-07
TAPPI Drying Rate - Pulp (Cylinder Dryers) 6.00
5.00 ) t f q 4.00 s / r h / r e t a w3.00 b l ( e t a R g 2.00 n i y r D
1.00
0.00 240
260
280
300
320
340
360
380
Aver age St eam Temp erat ur e (deg F)
Fig. 9E. Pulp (cylinder dryers) (English units)
TAPPI Drying Rate - Pulp (Cylinder Dryers ) - Metri c 25.0
20.0 ) m q s / r h / r 15.0 e t a w g k ( e t a10.0 R g n i y r D 5.0
0.0 110.0
120.0
130.0
140.0
150.0
160.0
170.0
Aver age St eam Tem per atu re (d eg C)
Fig. 9M. Pulp (cylinder dryers) (metric units)
180.0
190.0
200.0
TIP 0404-07
Paper machin e dryi ng rate / 18
TAPPI Drying Rate - Pulp (Air Dryers) 3.00
2.50 ) t f q 2.00 s / r h / r e t a w1.50 b l ( e t a R g 1.00 n i y r D
0.50
Note that area is defined as sheet width times dryer length times number of passes.
0.00 240
260
280
300
320
340
360
380
400
Aver age St eam Tem per atu re (d eg F)
Fig. 10E
Pulp (air dryers) (English units)
TAPPI Drying Rate - Pulp (Air Dryers) - Metric 14.0
12.0
) m10.0 q s / r h / r e 8.0 t a w g k ( e 6.0 t a R g n i y 4.0 r D
Note that area is defined as sheet width times dryer length times number of passes.
2.0
0.0 110.0
120.0
130.0
140.0
150.0
160.0
170.0
Aver age St eam Tem per atu re (d eg C)
Fig. 10M. Pulp (air dryers) (metric units)
180.0
190.0
200.0
19 / Paper machin e dry ing rate
TIP 0404-07
TAPPI Dryin g Rate - Paperboard 6.00
5.00 ) t f q 4.00 s / r h / r e t a w3.00 b l ( e t a R g 2.00 n i y r D
1.00
0.00 240
260
280
300
320
340
360
Aver age St eam Temp erat ur e (deg F)
Fig. 11E. Paperboard (English units)
TAPPI Dryin g Rate - Paperbo ard - Metric 30.0
25.0 ) m q s 20.0 / r h / r e t a w 15.0 g k ( e t a R g10.0 n i y r D 5.0
0.0 110.0
120.0
130.0
140.0
150.0
160.0
Aver age St eam Temp erat ur e (deg C)
Fig. 11M. Paperboard (metric units)
170.0
180.0
190.0
TIP 0404-07
Paper machin e dryi ng rate / 20
TAPPI Drying Rate - Gypsum Wallb oard 6
5 ) t f q s / r h / r e t a w b l (
e t a R g n i y r D
4
3
2
1
0 260
270
280
290
300
310
320
330
340
350
Aver age St eam Temp erat ur e (deg F)
Fig. 12E. Gypsum wallboard (English units)
TAPPI Drying Rate - Pulp (Can Dryers) - Metric 30.00
25.00 ) m q 20.00 s / r h / r e t a w 15.00 g k ( e t a R g 10.00 n i y r D 5.00
0.00 120.0
130.0
140.0
150.0
160.0
Aver age St eam Tem per atu re (d eg C)
Fig. 12M. (Gypsum wallboard (metric units)
170.0
180.0
21 / Paper machin e dry ing rate
TIP 0404-07
TAPPI Drying Rate ‐ Average Lines 8.00
7.00
6.00 Corrugating ) t f q s / r 5.00 h / r e t a w b 4.00 l ( e t a R g n i y 3.00 r D
Fine Paper Linerboard Bleached Board Newsprint Kraft Wood‐containing After‐size Pulp (Cylinders) Pulp (Air Dryers)
2.00
Paperboard Gypsum Wallboard 1.00
0.00 200
220
240
260
280
300
320
340
360
380
400
Average Steam Temperature (°F)
Fig 13E. Average curves for all machines (English units)
TAPPI Drying Rate - Average Lin es - Metric 40.0
35.0
) 30.0 m q s / r 25.0 h / r e t a w 20.0 g k ( e t a R 15.0 g n i y r D 10.0
Corrugating Fine Paper Linerboard Bleached Board Newsprint Kraft Wood-containing After-size Pulp (Cylinders) Pulp (Air Dryers) Paperboard Gypsum Wallboard
5.0
0.0 90
110
130
150
170
190
Aver age St eam Tem per atu re (d eg C)
Fig 13M. Average curves for all machines (metric units) g
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