[China Packaging Network News] presents a practical method for quickly calculating the weight of paper and the number of tons required for each order, especially useful for workers in printing, publishing, paper manufacturing, and accounting. These professionals often need to calculate the weight per order and the number of orders per ton, which can be time-consuming and error-prone.
When paper is shipped from the factory, it is typically measured in tons, while printing plants use individual orders as their unit of measurement. This creates the need to calculate how many orders make up one ton. For example, when a batch of books is printed and delivered to a bookstore, knowing the total number of books helps determine how many tons of paper are needed for transport, which requires calculating the weight per order.
Such calculations are common in daily operations, and there are various scenarios where this knowledge is essential. The examples provided are just two of many similar cases encountered in the industry.
Calculating the weight of paper and the number of orders per ton is often tedious and prone to mistakes. To simplify, some professionals manually compute the results and compile them into checklists, which are then published in specialized newspapers for easy reference.
The calculation method generally follows these steps (using the 787×1092 specification as an example):
1. Calculate the area of one sheet: 0.787 × 1.092 square meters
2. Determine the weight of one sheet: (0.787 × 1.092 × grammage) ÷ 1000
3. Find the weight of one ream (500 sheets): (0.787 × 1.092 × grammage) ÷ 1000 × 500
4. Calculate the number of reams per ton: 1000 ÷ weight per ream
To simplify this process, the formula was transformed to:
Number of reams per ton = 1000 / (0.787 × 1.092 × grammage ÷ 1000 × 500)
= (1000 × 1000) / (0.787 × 1.092 × 500 × grammage)
= 2327 / grammage
This simplification leads to a constant value of 2327, which is extremely accurate with an error margin of only 0.8‰.
For other standard paper sizes such as 850×1168, 880×1230, and 889×1194, similar derivations yield constants of 2015, 1848, and 1884 respectively.
By memorizing these four constants—2327, 2015, 1848, and 1884—professionals can easily calculate the number of reams per ton and the weight per ream for any paper size and grammage. This method greatly reduces the complexity of manual calculations and improves efficiency in the workplace.
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