Recently I bought a new flashlight that I decided to keep in the side pocket
of my Carhartt trousers. The flashlight was slightly too skinny and too long for the pocket, and kept falling out. Furthermore, the on-off button was not recessed particularly deeply, and would become actuated accidentally.
I decided to wrap a band of vinyl tape around the flashlight, just below the on-off button to help keep the flashlight in my pocket, and to possibly decrease the accidental discharges.
The vinyl tape was some I got from Boeing Surplus years ago, and seemed in every way ordinary, with normally sticky adhesive on one side. The tape was one inch wide, and I wrapped a one inch wide band to a thickness of about 4mm. As much as I could, I kept the wrapping tension constant.
I put the flashlight back in the pocket and went to bed. This morning this
is what I found. The top layers of tape had remained annular, but the bottom layers had crept remarkably
What I find interesting is that I was not wearing the trousers at the time, so as far as I know, the flashlight was more or less flat during the night. Temperature was normal indoor room temperature. Only the head of the flashlight is tapered, the rest of the flashlight is cylindrical.
Is this a commonplace behavior of vinyl tape, or is something more interesting going on? Could this be due to a unique brand of tape that Boeing used? Am I simply a rheology n00b?