Multilayer paper machine fabric having cross machine...

D - Textiles – Paper – 21 – F

Patent

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D21F 1/00 (2006.01)

Patent

CA 2609654

A papermaking fabric having a top layer and a bottom layer of interwoven machine direction (MD) yams and cross-machine direction (CD) yarns bound together with warp binder yarns. At least some of the CD yarns are made of a material which generates a strong contractive force when returned to room temperature after heat-setting (annealing under MD tension). These CD yarns are positioned such that the strong contractive force offsets tension forces generated when the fabric is placed under load and which typically result in an edge curl. An exemplary material for these CD yarns is polybutylene terephthalate (PBT).

L'invention concerne une toile pour la fabrication de papier présentant une couche supérieure et une couche inférieure de fils entrelacés sens machine (MD) et de fils entrelacés sens travers (CD) liées ensemble à l'aide de fils de liage de chaîne. Au moins certains des fils CD sont constitués d'une matière qui génère une force de contraction importante lorsqu'elle retourne à la température ambiante après thermofixage (recuit sous tension MD). Lesdits fils CD sont positionnés de sorte que la force de contraction importante compense les forces de tension générées lorsque la toile est placée sous une charge et qui entraînent généralement un roulage des bords. Un exemple de matière pour lesdits fils CD est du téréphtalate de polybutylène (PBT).

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