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Fifth, look at the paper tube: the choice of thick paper tube tape generally to mislead the consumer. Tape production from abroad started, so tape paper tube diameter of 7.6 cm are unified, but the poor quality tape in the thickness of the paper tube is spared no effort, and this situation still has a relationship with many consumers , many people think that the thicker the paper tube, the greater the outer ring, the more tape on the roll and shoved one seems quite right, in fact, you can carefully calculate it? Said paper tube with 3 mm and 7 mm paper tube than it, if two rolls of paper tape from the tape to the edge of the tube diameter pure tape thickness is 1 cm, we can calculate mathematical formula about 7 mm paper tube contrast 3 mm of paper per 1 cm thick plastic tape meters can have more?
If the same tape thickness, from the figure we can easily calculate, 7 mm paper tube paper tube than 3 mm 4 mm thick, which is more than 8 mm in diameter, in terms of rice is 8 ÷ 1000 = 0.008 Mina converted into perimeter then 7 mm tape paper tube paper tube than 3 mm tape each turn how much more rice it? That is 3.14 × 0.008 = 0.02512 meters. The 1 cm thickness of plastic tape, how many laps it? We said above,