Valmet-karlstad Ab

Kimberly-clark Worldwide, Inc.

Bernt Erik Klerelid

Ronald Frederick Gropp

Philip Sim Lin

Tommy Rolf Karlsson

Brian Douglas Klaubert

Tord Olof Svanqvist

Bo Lennart Ortemo

Randall James Le Valley

Randall James LeValley

A uniformly wound parent roll of soft, high bulk tissue has greater uniformity in sheet basis weight, machine direction stretch and bulk when compared to parent rolls wound by conventional winding methods. The method involves carrying the tissue sheet on a relatively air impermeable transfer belt which traverses an unsupported span between two winding drums. The sheet is transferred from the transfer belt to the parent roll as the parent roll is urged against the sheet/transfer belt at a point within the unsupported span. The resulting deflection of the transfer belt is detected and, in response, the reel spool position is controllably changed to maintain the deflection within predetermined limits. The tension of the sheet is controlled by the predetermined differential speed between the outer most surface of the parent roll and the transfer belt.

Parent roll for tissue paper

An apparatus and method for winding tissue webs into a parent roll is disclosed which results in greater uniformity in sheet basis weight, machine direction stretch and bulk when comparing the corresponding sheet properties taken from representative locations throughout the roll. The apparatus and method includes engaging the tissue web against a reel spool with a flexible member such as a transfer belt which traverses an unsupported span between two support rolls. The web is transferred from the transfer belt to the parent roll as the parent roll is urged against the sheet/transfer belt at a point within the unsupported span. The resulting deflection of the transfer belt is detected and, in response, the reel spool position is changed to control the deflection at a desired level. Accordingly, a predetermined light nip pressure can be applied to the roll as the tissue web is wound thereon and large parent rolls of high bulk tissue can be manufactured with desired properties when unwound.

Apparatus and method for winding paper

An apparatus and method for winding tissue webs into a parent roll includes a rotatable reel drum having a flexible outer shell for engaging a web of tissue paper against a reel spool. A deflection sensor is mounted adjacent to the inner surface of the outer shell for measuring the amount of deflection of the flexible outer shell caused by the paper roll. The amount of deflection is related to the pressure at the nip point and, by moving the reel spool and flexible reel drum away from each other as the diameter of the paper roll increases, the pressure can be controlled at a desired level. Accordingly, a predetermined light nip pressure can be applied to the roll as the tissue web is wound thereon and large parent rolls of high bulk tissue can be manufactured with desired properties when unwound.

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Karlstad, Sweden

Bernt Erik Klerelid