Method and apparatus for making dimensionally stable...

D - Textiles – Paper – 04 – H

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D04H 3/03 (2006.01) D03C 3/00 (2006.01) D04H 1/72 (2006.01) D04H 3/08 (2006.01) D04H 3/16 (2006.01) D04H 5/08 (2006.01)

Patent

CA 2324147

A method and apparatus for tentering nonwoven webs during annealing. The nonwoven web of thermoplastic fibers is restrained on a tentering structure at a plurality of tentering points distributed across an interior portion of the web, rather than just along its edges. The non-woven web is annealed while restrained on the tentering structure to form a dimensionally stable nonwoven fibrous web, dimensionally stable up to at least the heat-setting temperature. The annealed nonwoven fibrous web is then removed from the tentering structure. In one embodiment, the tentering structure restrains the nonwoven fibrous web in a non-planar configuration during the annealing process. The tentering structure includes a plurality of tentering points projecting distally from a centering support. The centering points are positioned to be engaged with an interior portion of the web, thus restraining the web during annealing.

On décrit un procédé et un appareil permettant d'effectuer le ramage de nappes de nontissé pendant le refroidissement progressif. La nappe de fibres thermoplastiques non tissées est retenue sur une structure de ramage au niveau de plusieurs points de ramage répartis sur une partie interne de la nappe, plutôt que sur ses côtés uniquement. La nappe de nontissé est refroidie progressivement alors qu'elle est retenue sur la structure de ramage pour former une nappe de fibres non tissées à stabilité dimensionnelle, qui est dimensionnellement stable jusqu'à au moins la température de thermofixage. La nappe de fibres non tissées refroidie progressivement est ensuite ôtée de la structure de ramage. Dans une forme de réalisation, la structure de ramage retient la nappe de fibres non tissées dans une configuration non plane pendant le processus de refroidissement progressif. La structure de ramage comprend plusieurs points de ramage qui se projettent de manière distale depuis un support de ramage. Les points de ramage sont placés de manière à se trouver en contact avec une partie interne de la nappe, ceci ayant pour effet de retenir la nappe pendant le refroidissement progressif.

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