Winding – tensioning – or guiding – Wound storage package – Convolute coil
Patent
1998-02-10
2000-08-15
Walsh, Donald P.
Winding, tensioning, or guiding
Wound storage package
Convolute coil
242410, 2425342, 2425414, 2425711, B65H 1828
Patent
active
061023132
ABSTRACT:
A roll of sheet material, such as plastic film wrap, having an inner layer wound at low tension and an outer layer wound under greater tension provides a coreless roll. Eliminating the need for a core reduces the cost of producing rolls of sheet material, and reduces the weight and outer dimensions of the roll with a consequent reduction in shipping and storage costs. An apparatus and method for producing such a roll, from a pre-wound master roll or as part of a production line for forming the sheet material, involves varying the longitudinal tension applied to sheet material as it is wound onto an expandable mandrel. After the roll has cured, the mandrel is collapsed and disengaged from the roll to provide a coreless roll. The mater roll can be prestretched prior to forming the coreless roll, if desired, and can be prestretched as a step in the formation of the coreless roll.
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Salzsauler Donald J.
Salzsauler Edward R.
Salzsauler Richard G.
Rivera William A.
Saltech Inc.
Walsh Donald P.
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