Weight or reel in kgs x 100000
Length of paper in meters =___________________________
Reel width in cm x grams per sq. meter
For Example:-The length of paper of substance 100 gsm in a reel of 75 cm width and weighing 150 kg
150 x 100000
_______= 2000 Meters
75 x 100
2. To calculate the weight of a reel of paper in kilograms where the substance of the paper in grams per square meter, the total length of the paper in the reel and the reel width is known:
Weight of reel in kg = length in meters x reel width in cm x gsm x .00001
For Example:-The weight of a reel with a total length of 1500 meters paper of 80 gsm with a reel width of 100 cm
1500 x 100 x 80 x 0.0001 = 120 kg.
3. To calculate the substance of paper in a reel where the total length of the paper in reel, width of the reel, and its net weight is given
Weight or reel in kg x 100000
Substance in gsm =_______________________________
Length of paper in meters x reel width in cm
For Example: -The substance of paper in a reel of 250 cm width and which weighs 200 kg and contains a total length of 1000 meters paper
200 x 100000
____________= 80 gsm
1000 x 250
4.To calculate the approximate number of sheets of a particular size which may be obtained from a reel of paper, the net weight of the reel and the substance of the paper being known and the width of the reel being known, and the width of the reel being known and the width of the reel being equal to or exact multiple of the dimension of one side of the sheet.
Weight of reel In kg x 10000000
No.or Sheets =______________________________
Gsm x breadth of the sheets in cm x length of the sheets in Cm
For Example:- Approximate number of sheets of size 51*76 cms to be obtained from a reel of paper of 60 gsm substance and having a reel width of 255 cm and weighing 175 kg
175 x 10000000
___________= 7524 sheets
60* 51*76
5.To find the approximate number of sheets of two different sizes to be obtained cut from a reel, the sizes filling the complete decide (trimmed).
First, the proportion of the deckle (trimmed) utilised to obtain the two different sizes is to be found out and consequently the proportion of the weights of the reel to get the two sizes equivalent to the above proportion of the reel utilised. to get the two sizes Is obtained and the approximate number of sheets for each size is then calculated from the previous formula No. 4, the substance of the paper being known.
For Example:- To fill a deckle (trimmed) of 188 cm a reel of paper of 80 gsm substance is cut into proportions of 2*56 cm and 1*76 cm to obtain a paper of two different sizes of 56*91cm and 76*102 cm. Find out the approximate number of sheets of the two sizes obtained by cutting the full reel into sheets, the weight of the reel being 376 kg. Portions of the deckle utilised for sizes 56*91 cm and 76*102 cm are respectively.
2*56 1*76
__And__
188 180
Therefore the weight of the portion of the reel utilised for the size 56*91 cm is
376*2*56
= 224 kg.
188
and the weight of the portion of the reel utilised for the size 76*102 cm is
376*1*76
______= 152 kg.
188
Approximate number of sheets for size 56*91cm
224 x 10000000
= 5494 sheets.
80*56*91
Approximate number of sheets for size 76*102 cm
152*10000000
= 2450 sheets.
80*76*102
N.B.:- For any specifications given in inches, first, we should convert into cm by multiplying by 2.54 for getting the correct result
i.e., if the size is 18″(length) x 23″(breadth) the sizes are to be converted as 18″*2.54 = 45.7 cm and 23″*2.54 = 58.4 cm and then only other multiplications are to be computed as above.
