Convolute cardboard tube, apparatus and method for manufacturing the same
AssigneeAbzac Canada Inc.
InventorPierre-Michel D'Anglade
Life of this patent
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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.
Claims17
A method for manufacturing a convolute cardboard tube, the method comprising:
- unwinding a roll of a preselected cardboard in a machine direction tangential to the roll of the preselected cardboard by rotating the roll along a first rotation axis R1, thereby obtaining an unwound cardboard sheet, the preselected cardboard including a plurality of fibers, at least a majority of the plurality of fibers being substantially oriented in the machine direction;
- straight rolling the unwound cardboard sheet onto a tube forming roller rotating about a second rotation axis R2 into the convolute cardboard tube, the convolute cardboard tube including at least a majority of the plurality of fibers oriented in a winding direction;
- and
- cutting the unwound cardboard sheet along its width,
- wherein the second rotation axis R2 is parallel to the first rotation axis R1;
- and
- wherein straight rolling the unwound cardboard sheet includes rotating the unwound cardboard sheet along the second rotation axis at a speed of about 1 m/s to about 3 m/s.
Dependencies are inferred from the claim text.