Laser drilling processes for making fabric and film forming...

B - Operations – Transporting – 23 – K

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Details

B23K 26/08 (2006.01) B29C 59/16 (2006.01)

Patent

CA 2240773

Support members and method of forming support members for use in producing nonwoven fabrics, especially tricot-like nonwoven fabrics, and films. A topographical support member includes a body having a top surface comprising a pattern of a plurality of peaks and valleys and a plurality of apertures. The apertures have a conical top portion that is surrounded by a cluster of the peaks and valleys. The center line to center line spacing of adjacent apertures is less than the major diameter of the conical top portion of the apertures. The topographical support member is formed in a defocused process by focusing a laser beam so that the focal point is below the top surface of a starting work-piece and drilling with the laser beam the predetermined pattern of tapered apertures. The pattern of tapered apertures forms the cluster of peaks and valleys surrounding each aperture on the top surface of the resulting support member. A smooth, flat surface support member is formed by focusing the laser beam at the top surface of the workpiece or by adjusting the center line to center line spacing of apertures formed by the defocused process so that no peaks or valleys result. A perforated film or nonwoven fabric can be formed using the smooth surface support member.

Cette invention se rapporte à des éléments de support et à un procédé de formation des ces éléments de support, à utiliser pour produire des non-tissés, en particulier des non-tissés de types tricots et des films. Un élément de support topographique comprend un corps ayant une surface supérieure comportant une configuration de plusieurs creux et bosses et de plusieurs ouvertures. Les ouvertures possèdent une partie supérieure conique qui est entourée par un groupe de ces creux et bosses. L'espacement entre les lignes médianes d'ouvertures adjacentes est inférieur au plus grand diamètre de la partie supérieure conique desdites ouvertures. On forme l'élément de support topographique dans un processus défocalisé, en focalisant un faisceau laser pour que le foyer soit situé sous la surface supérieure d'une pièce de départ et en perforant au moyen du faisceau laser les ouvertures coniques selon la configuration prédéterminée. La configuration de ces ouvertures coniques forme le groupe des creux et des bosses entourant chaque ouverture sur la surface supérieure de l'élément de support qui en résulte. On forme un élément de support à surface plate et lisse en focalisant le faisceau laser sur la surface supérieure de la pièce ou en réglant l'espacement entre les lignes médianes d'ouvertures formées par le processus défocalisé, pour qu'aucun creux ni aucune bosse n'en résulte. On peut former un film ou un non-tissé perforé en utilisant cet élément de support à surface lisse.

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