Uniformly wound rolls of soft tissue sheets having high bulk

Details Uniformly wound rolls of soft tissue sheets having high bulk Uniformly wound rolls of soft tissue sheets having high bulk

B - Operations, Transporting

65

H

B65H 18/28 (2006.01) B65H 18/22 (2006.01) B65H 18/26 (2006.01)

Patent

CA 2285304

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 (18) which traverses an unsupported span between two winding drums. The sheet (15) is transferred from the transfer belt to the parent roll (25) 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.

L'invention concerne une bobine mère à enroulement uniforme de tissu ouaté volumineux, dont l'uniformité de poids en feuilles, d'étirement dans le sens de production et de volume, est supérieure à l'uniformité correspondante de bobines mères enroulées selon les procédés de bobinage classiques. Le procédé consiste à acheminer la feuille de tissu sur une courroie de transfert (18) relativement imperméable à l'air qui traverse un intervalle sans portée entre deux rouleaux porteurs. La feuille (15) est ensuite transférée de cette courroie vers la bobine mère (25), au stade où ladite bobine est appuyée contre la courroie de transfert de feuille en un point de l'intervalle sans portée, moyennant quoi la déviation résultante est détectée. En réponse, il est possible de commander le changement de position du mandrin de la bobine mère, afin de maintenir la déviation susmentionnée dans des limites prédéterminées. On contrôle la tension de la feuille via la vitesse différentielle préétablie entre la surface située le plus à l'extérieur sur la bobine mère et la courroie de transfert.

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