Convolute cardboard tube, apparatus and method for manufacturing the same
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United States of America Patent
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Aug 27, 2024
Grant Date -
Apr 20, 2023
app pub date -
May 13, 2022
filing date -
May 13, 2022
priority date (Note) -
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Abstract
A plastic film roll includes: a convolute cardboard tube including a tubular body having a tubular body wall formed by a plurality of layers of a straight rolled cardboard sheet having a weight equal to or less than 300 gsm; a plastic film wound about the convolute cardboard tube to form a plurality of plastic film windings around the convolute cardboard tube, the plastic film windings creating a radial compression force equal to or greater than 10 bar on the tubular body wall, wherein the cardboard sheet includes a plurality of fibers, at least a majority of the fibers being substantially aligned in a tangential direction relative to the tubular body to allow the convolute cardboard tube to resist the radial compression force.
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