How about the theoretical length of the packing belt?
The whole set is packaged with. If it is with paper tube, you have to use steel tape, packing tape paper tube diameter measurement, measuring the thickness of the side straps, two data, then the sum is packaged with from the inner circle to an arbitrary side edge length].B multiplied by 3.1416 then, A is equal to the length multiplied by the packing belt (units are in meters). The error is within 0.2 meters. For example: the first number 20 is a plastic packing belt cross the laps, and then measure out a disc plastic packing belt within a circle on either side of the side length is 0.16 meters, for this one: plastic disc packaged with how many meters? 0.16 meters multiplied by 3.1416, multiplied by 2656 meters by 312 meters 20=0.50 20=10.05 actual measurement this small plastic packing belt is 10 meters.
The whole set is packaged with a paper tube. If you have to use steel tape, packing tape paper tube diameter measurement, measuring the thickness of the side straps, two data obtained, then add. Is packaged with from the inner circle to an arbitrary side edge length and then put the]. The above, these three data finally obtained and multiplied, and then multiplied by 3.1416, the last is equal to the disc pack how many meters (remember, this formula is only suitable for the disk pack, and the circular disc pack, round the middle part must be hollow
First use steel tape measure belt width (millimeter), and then use the steel tape measure the disc pack the disc height (circular millimeter), with a height divided by the belt width mm mm, equal to the disc pack can have many layers. 2: reuse measure the thickness of the packing belt (millimeter). Then the steel tape measure the disc pack above or below the surface, a two surface of arbitrary, side by side thickness, the thickness of the belt thickness divided by mm mm, equal to the surface is packaged with the number of laps. Use: steel tape measure the disc pack from the inner circle on either side of the edge length (units are in meters), [remember, this package is not with paper tube, or there is no other measuring tube, when the
