Paper Math
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How To
Determine M Weights
How To Determine the Approximate Weight of a Roll
How To Determine the Approximate Linear Footage of a Roll
|
How
To Determine M Weights |
Top |
The ream weight is the weight of 500 sheets; the M weight is the weight of 1,000 sheets.
The M weight can be obtained by first finding the ream weight, rounding it to the
nearest pound, then multiplying by 2.Formula
|
| Given size x
basis weight |
= |
Rounded ream weight x 2 |
= |
M weight |
| Area of basic size |
|
Example
What is the M weight of 23 x 35, basis 60lb. offset paper?
|
| 23 x 35 x 60 |
= |
51 x 2 |
= |
102M |
| 950 |
|
Basic Sizes
| Bond |
17 x 22 |
= 374 square inches |
| Book & Offset |
25 x 38 |
= 950 square inches |
| Cover |
20 x 26 |
= 520 square inches |
| Vellum Bristol |
22½ x 28½ |
= 641 square inches |
| Index |
25½ x 30½ |
= 778 square inches |
| Tag |
24 x 36 |
= 864 square inches |
|
How To Determine the
Approximate Weight of a Roll |
Top |
To find the approximate weight of a roll, multiply roll diameter squared minus core
diameter squared by roll width and appropriate factor.Formula
| (Roll diameter²
- core diameter²) |
= |
Approximate weight
of a roll x width of roll x factor |
|
Example
Find the weight of a 35" width, 40" diameter, 3" inch core roll of
smooth offset paper.
| {(40 x 40) - (3 x 3)} x 35 x .22a
= 1,225 lbs |
Factors
| Smooth Offset |
.022 |
| Vellum Offset |
.020 |
| Antique |
.018 |
| Bond |
.024 |
| Tag and Index |
.026 |
| Vellum Bristol-Cover |
.022 |
|
How
To Determine the
Approximate Linear Footage of a Roll |
Top |
To find the approximate linear footage in a roll of paper, multiply the weight of the roll
by the basic size times 500. Then divide by the sum representing the width of the
roll, multiplied by the substance or basis weight, times 12.
Formula
| Roll weight x
area of basic size x 500 |
= |
Approximate linear footage |
| Basis weight x roll
width x 12 |
|
Example
Find the footage of a 875 lb., 25" wide, basis 50lb. offset roll.
| 875 x 25 x 38
x 500 |
= |
27,708 linear feet |
| 50 x 25 x 12 |
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