product recovery medford · 10/18/2006 · , ¢ 1 1 1 1 1 1 1 1 &rpprq 1dph /dwlq 1dph *uhhq...

Matt Fonseca, October 18, 2006

Timber Measurement Society, Central Meeting, Medford Oregon

THE DRIVERS OF PRODUCT RECOVERY

Scribner Decimal C, Diagram Rule

1" x 12"

1" x 12"

1" x 12"

1" x 12"

1" x 12"

1" x 12"

1" x 12"

1" x 12"

1" x 12"

1" x 10"

1" x 10"

1

x

8

1

x

10

1" x 4"

1" x 6"

1x 4

Maximum scaling cylinder is:

• 20’ east of the Cascades and in California

• 40’ west of the Cascades and in Alaska

Two segment log

d = 15”

D = 18”

S2d is interpolated as 17”

Segment 1: 16’ long, 15” s.e.d. = 14 decimal C or 140 bf Segment 2: 16’ long, 17” s.e.d. = 18 decimal C or 180 bf

Total log volume = 320 bf

Small end Large end diameter "d" S2d diameter "D"

Segment 1 (S1) Segment 2 (S2)

Recorded length 32'

(14.8”)

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 2034567891011121314151617181920

Length of log segm ent in fee t

Scribner short log volume chart (Revised)

Scribner long-log volume chart

21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40456789

1011121314151617181920

Length of log segment in feet

Sm

all-

end

dia

. lo

g s

egm

ent

in in

ches

US Cubic Log scaleSegment 1 calculation: (152 + 172) x 16 x .002727 = 22.4 ft3 (0.634 m3)Segment 2 calculation: (172 + 182) x 16 x .002727 = 26.7 ft3 (0.756 m3)

Total log volume = 49.1 ft3 (1.390 m3)

Small end Large end diameter "d" S2d diameter "D"

Segment 1 (S1) Segment 2 (S2)

Recorded length 32'

BC Cubic Log scaleLog volume: (192 + 232) x 10.1 x .00015708 = 1.412 m3 (49.9 ft3)

Log #1, 164 lbs20 b.f. lumber = 18.1 b.f.

5" 16' 6" 2.7 c.f b.f. rec. = 0.911.35 ccf/mbf LRF = 6.7

Log #2, 418 lbs20 b.f. lumber = 44.8 bf

6" 20' 9" 6.4 c.f b.f. rec. = 2.243.20 ccf/mbf LRF = 7

Log #3, 235 lbs20 b.f. lumber = 27.4 b.f.


Log #4, 446 lbs20 b.f. lumber = 54.77.1 c.f. b.f. rec. = 2.73

8" 14' 11" 3.55 ccf/mbf LRF = 7.7

Log #5, 241 lbs20 b.f. lumber = 30.8


Typical distribution of fiber in the lumber manufacturing process

Lumber Chips Sawdust Shavings ShrinkageBoards 41% 31% 12% 13% 3%Stud 48% 34% 7% 8% 3%Dimension 48% 33% 7% 9% 3%Hardwood 44% 25% 14% 10% 7%

Note: Based on recoveries on the following average small-end diameter logs 10” - boards, 7” – studs, 10” – dimension, 13” – hardwood.

Factors affecting lumber recovery; milling efficiency (cont.)

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

Sm all-end diam eter

Per

cen

t o

f lo

g v

olu

me

Dry chips

Shavings

Shrinkage

GreenChips

Sawdust

Lum ber

Material balance by diameter (dimension mill)

Lumber recovery by small-end diameter of log and mill type, actual log volume (B.C. Firmwood) (LRF)

170

195

220

245

270

295

320

345

370

395

5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

SED inches

BF

lum

ber

/m3

log

13 15 18 20 23 25 28 30 33 36 38 41 43 46 48 51 53 56 58 61 64 66 69 71 74 76

SED cm

BF

lum

ber

/ft3 lo

g

Boards StudDimension Hardwood

4.8

5.4

6.0

6.6

7.2

7.8

8.4

9.0

9.6

10.2

10.8

Scribner Short Log Rule recovery by lumber product and log diameter

0.90

1.10

1.30

1.50

1.70

1.90

2.10

2.30

SED inches

BF

lum

ber

/BF

log

SED cm

Boards Studs

Dimension Hardw ood

Scribner Long Log Rule recovery by lumber product and log diameter

0.90

1.10

1.30

1.50

1.70

1.90

2.10

2.30

2.50

2.70

2.90

3.10

SED inches

BF

lum

ber

/BF

log

SED cm

Boards Studs

Dimension Hardw ood

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

Small-end diameter

Per

cen

t o

f lo

g v

olu

me

log

e

Dry Chips

Shrinkage

Greenchips

Corevolume

Plywood

Plywood recovery by small-end diameter, product output scaled logs

2.00

2.50

3.00

3.50

4.00

4.50

5.00

5.50

6.00

6.50

SED inches

Ft2 3/

8"/B

F lo

g

SED cm

Scribner SL Scribner LL

Doyle International 1/4"

Green chip sample = 922 gBone-dry sample = 497 g

497 ÷ 922 = 53.9% fiber.539 x 71,000 = 38,269 lbs

Lumber chip recoveryExample:#5 larch, 1”x 4”x 8’ = 13.44 bf per ft3 rough green

Target size is: 0.94” x 3.80” x 8’

•1000 ÷ 13.44 = 74.4 ft3 of lumber per MBF

• 74.4 ÷ 80.1 ft3 per BDU = 0.93 BDU/MBF

• 0.93 x $80/BDU = $74.40/MBF as chips

product recovery medford · 10/18/2006 · , ¢ 1 1 1 1 1 1 1 1 &rpprq 1dph /dwlq 1dph *uhhq...

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