A qualitative model to describe microscopic 'jumps' by adhesive tape unwinding from a roll

phys.org | 2/21/2019 | Staff
blacky (Posted by) Level 3
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A team of researchers from Universite de Lyon and Centre National de la Recherche Scientifique has developed a qualitative model to describe microscopic "jumps" that happen when adhesive tape is unwound from a roll. In their paper published in the journal Physical Review Letters, the group describes their study of the process using high-speed cameras and what they found.

Extracting a length of duct tape from a roll rarely goes smoothly. First, you have to get your nails under the end, then you have to pull up and back as you attempt to unroll it. But this unwinding always happens in fits and starts, rather than as a smooth removal process, making it difficult to obtain the desired length. Back in 2010, a group of scientists filmed the process with a high-speed camera hoping to better understand what happens. They found that the longer macroscopic jumps were actually a series of much smaller jumps. Also, the line formed at the juncture of the unwound tape and the tape still stuck to the roll was not straight.

Team - Process - Cameras

In 2015, another team studied the process using the same technology—high-speed cameras. But this...
(Excerpt) Read more at: phys.org
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