Method and apparatus for manufacturing an absorbent article

A - Human Necessities – 61 – F

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Details

A61F 13/15 (2006.01) B65H 20/08 (2006.01) B65H 20/24 (2006.01)

Patent

CA 2175555

The invention relates to a method of manufacturing an absorbent article (144), wherein the speed of a part (7b) of a continuously moving web (1) comprising a topsheet (121), backsheet (123), core (120) or any combination thereof, is periodically varied, while maintaining a constant speed of the upstream (3) and downstream (5) parts of the web (1). The method comprises feeding the web (1) past rotating transportation rollers (13, 15) which are oscillated parallel to the web (1) in the direction of transportation (F) and opposite to the direction of transportation (F). Three web sections (7a, 7b, 7c) are during oscillation of the transportation rollers (13, 15) maintained in a mutually parallel relationship. Translation means (77) and rotation balancing means (63, 63') allow the transportation rollers (13, 15) to be driven at high speeds and low variations in torque. The strain exerted on the web (1) remains relatively low and is limited to the inertia forces that act on the web (1).

L'invention se rapporte à un procédé de fabrication d'un article absorbant (144). Au cours de ce procédé, la vitesse d'une partie (7b) d'une bande (1) à défilement continu comportant une feuille supérieure (121), une feuille inférieure (123), une âme (120) ou tout autre agencement, varie périodiquement, alors qu'une vitesse constante des parties amont (3) et aval (5) de la bande (1) et maintenue. Le procédé consiste à faire passer la bande (1) devant des cylindres de transport rotatifs (13, 15) qui oscillent parallèlement à la bande (1) dans le sens du transport (F) et dans le sens opposé au transport (F). Trois sections (7a, 7b, 7c) de la bande, lors de l'oscillation des cylindres de transport (13, 15), sont maintenues parallèles les unes par rapport aux autres. Un dispositif d'équilibrage du mouvement de translation (77) et des dispositifs d'équilibrage (63, 63') de la rotation permettent l'entraînement des cylindres de transport (13, 15) à des vitesses élevées et à de faibles variations du couple. La contrainte exercée sur la bande (1) reste relativement faible et est limitée aux forces d'inertie qui agissent sur la bande (1).

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