Absorbent articles with reduced cross-directional wrinkles

A - Human Necessities – 61 – F

Patent

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Details

A61F 13/15 (2006.01)

Patent

CA 2219726

Absorbent articles containing absorbent cores of fluff pulp frequently contain wrinkles in the absorbent core that run from side to side of the article, typically normal to the machine direction in the manufacturing process. Side-to-side wrinkles are deleterious in that they provide large flow channels for urine or other body fluids to escape to the edge of the article. Frequently, such wrinkles are present after manufacturing, before the article has been folded or worn. The cause of the wrinkles is believed to be due to natural instabilities during compression of the fluff pad shortly after it is formed. Means for reducing cross-directional wrinkles include the use of grooved, drilled, or patterned compression rolls to densify the fluff pulp while providing opportunities for reduced in-plane displacement during compression or, if in-plane displacement does occur, providing paths for cross-directional displacement as well as machine-direction displacement so that continuous CD wrinkles cannot form. The use of large diameter rolls with soft rubber covers can also be used.

Les articles absorbants contenant des matières absorbantes à base de pâte en flocons contiennent souvent des faux plis transversaux créés au cours du défilement normal des articles dans le processus de fabrication. Les faux plis transversaux sont nuisibles en ce qu'ils favorisant l'écoulement de l'urine et autres liquides corporels et leur fuite par les rebords de l'article absorbant. Ces faux plis sont souvent présents au terme du processus de fabrication, avant même que l'article absorbant n'ait fait l'objet du pliage. La formation des faux plis transversaux est attribuée à l'instabilité naturelle de la pâte en flocons dans les articles nouvellement formés durant leur phase de compression. Les moyens proposés pour réduire la formation de faux plis transversaux incluent le recours à des rouleaux de compression rainurés, percés ou gaufrés afin de densifier la pâte en flocons tout en permettant un certain déplacement des matières dans l'axe de défilement durant la compression, ou une combinaison de déplacement longitudinal et transversal empêchant l'apparition de plis transversaux continus. L'utilisation de rouleaux de fort diamètre recouverts d'un revêtement de caoutchouc est aussi préconisée.

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