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Paper Math
Weight per M Sheets (for any grade):
Formula: (Weight per M Sheets) = (Basis weight) ÷ (Grade Factor) x (length) x (width)
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Grade Factor: |
Bond |
Book |
Cover |
Index |
Bristol |
Tag |
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|
187 |
475 |
260 |
388.88 |
320.63 |
432 |
Examples:
1.) What is the M weight of 100# tag in 28" x 40" sheets
100 lbs. ÷ 432 x 28" x 40" = 259.28 lbs. / M sheets
2.) What is the M weight of 80 lb offset (book) in 23" x 35" sheets
80 lbs. ÷ 475 x 23" x 35" = 135.56 lbs. / M sheets
Length (linear feet) per Roll:
Formula: (Linear Feet per roll) = .0654 x (OD²-ID²) ÷ caliper(.000)
Example:
What is the linear footage of a roll of 60# offset (book basis weight scale) with a .0045 caliper, 32" roll width, 36" OD, and 3" core?
.0654 x (36²-3²) ÷ .0045 = 18,704.4 linear feet per roll
Weight per Roll:
Formula: (Weight per Roll) = (linear feet from formula above) x (roll width) ÷ 12 x (basis weight) ÷ (sq. ft. factor*)
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* Sq. Ft. Factor: |
Bond |
Book |
Cover |
Index |
Bristol |
Tag |
|
|
1,299 |
3,299 |
1,806 |
2,701 |
2,227 |
3,000 |
Example:
What is the weight of the roll described in the example above (under the linear feet/roll example)?
18,704.4 x 32" ÷ 12 x 60 ÷ 3,299 = 907 lbs. per roll
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