Machine and method for providing rolls of material for use in sheet form, particularly aluminum for food uses, of the coreless type
AssigneeIms Technologies S.P.A.
InventorsAlberto BELDI', Cesare CORNALBA
Life of this patent
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Abstract
A method for providing rolls of material for use in sheet form, particularly aluminum for food uses, comprising a step of rewinding the material for use in sheet form in order to form a roll; the rewinding step is provided by winding the material for use in sheet form directly on a rewinding shaft, with the material for use in sheet form in contact with a cylindrical outer lateral surface of the rewinding shaft, which is actuated with a rotary motion about its longitudinal axis, so as to obtain a coreless roll.
Claims12
-11. (canceled)
A machine for providing rolls of material for use in sheet form, particularly aluminum for food uses, comprising:
- at least one substantially cylindrical rewinding shaft, which can be actuated with a rotary motion about a longitudinal axis thereof in order to perform a step of rewinding said material for use in sheet form and
- means for feeding the material for use in sheet form which can be actuated in order to feed the cylindrical rewinding shaft with the material for use in sheet form to be wound;
- wherein said at least one rewinding shaft comprises a plurality of cylindrical sectors which are arranged circumferentially around said longitudinal axis and form an outer lateral surface of the rewinding shaft which is configured to make contact with said material for use in sheet form during said winding step;
- said cylindrical sectors comprising fixed cylindrical sectors alternated with retractable cylindrical sectors;
- said retractable cylindrical sectors being able to translate radially toward and away with respect to said longitudinal axis between:
- an expanded position, in which said retractable cylindrical sectors and said fixed cylindrical sectors are arranged flush, so as to form an outer lateral surface of the rewinding shaft which is cylindrical and substantially uniform and
- a retracted position, in which said retractable cylindrical sectors are arranged more internally with respect to said expanded position, so that longitudinal depressions are formed along said outer lateral surface of the rewinding shaft.
A method for providing rolls of material for use in sheet form, particularly aluminum alloy for food uses, comprising a step of rewinding the material for use in sheet form in order to form a roll,
- wherein said rewinding step is provided by winding said material for use in sheet form directly on a rewinding shaft, with said material for use in sheet form in contact with a continuous cylindrical outer lateral surface of said rewinding shaft, which is actuated with a rotary motion about its longitudinal axis, so as to obtain a coreless roll,
- and wherein said rewinding step comprises, before the material for use in sheet form is wound at least once around said rewinding shaft, a step of radial expansion of retractable cylindrical sectors of said rewinding shaft that is adapted to define said continuous cylindrical outer lateral surface together with fixed cylindrical sectors of said rewinding shaft.
Dependencies are inferred from the claim text.