Polyester insulation

D - Textiles – Paper – 04 – H

Patent

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Details

D04H 1/56 (2006.01) B32B 5/26 (2006.01) D01D 5/098 (2006.01) D04H 1/54 (2006.01) E04B 1/74 (2006.01)

Patent

CA 2190957

A non-woven mat of fibrous thermoplastic insulation is produced by melt blowing recycled polyethylene teraphthalate (PET). The PET is melted, pressurized and extruded from an extrusion head into substantially continuous fibers that are subjected to turbulent high velocity air that attenuates the fibers. The fibers are then collected on a collection device building up a non- woven mat. The collection device is spaced from the extrusion device forming a flight path for the fibers that is sufficiently long that the fibers split apart under the force of the high velocity air, fibrillating into a plurality of very fine fibrils of under 15 microns in diameter. These fibrils are analogous to goose down and greatly enhance the loft and R value of the mat.

Un tapis en non-tissé d'isolation thermoplastique fibreuse (52, 54, 56) est produit par soufflage à l'état fondu de téréphthalate de polyéthylène recyclé (PET). Le PET est fondu, mis sous pression puis extrudé à l'aide d'une tête d'extrusion (5) pour le transformer en fibres continues (20) qui sont soumises à un courant d'air turbulent à haute vitesse (41) qui atténue les fibres (C). Les fibres (22) sont ensuite récupérées dans un dispositif de récupération (39) pour former par accumulation un tapis en non-tissé. Le dispositif de récupération (39) est espacé du dispositif d'extrusion (5) pour former un chemin de vol de fibres (20), ce chemin de circulation étant suffisament long pour que les fibres se séparent en raison de la force de l'air (41) circulant à haute vitesse, les fibres subissant ainsi une fibrillation et se transformant en plusieurs fibrilles très fines (22) d'un diamètre inférieure à 15 microns. Ces fibrilles (22) sont analogues et améliorent considérablement la torsion floche et la valeur R du tapis.

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