Press felt for papermaking

D - Textiles – Paper – 21 – F

Patent

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Details

D21F 7/08 (2006.01)

Patent

CA 2636263

A press felt (10) for papermaking which is composed of a substrate (30), a wet paper side vat layer (20), and a press side vat layer (23), wherein the wet paper side vat layer (20) is composed of a wet paper contact side vat layer (21) and a substrate side vat layer (22); the substrate side vat layer (22) containing a core-sheath composite fiber (41) constituted of a core made of a high-molecular nylon having an absolute viscosity of 80mPa~s or above and a sheath made of a nylon having a melting point lower than that of the core- constituting nylon; and the wet paper contact side vat layer (21) being made of a nylon fiber (42) free from the composite fiber (41). Since the substrate side vat layer (22) is enhanced in denseness through the melting of the sheath of the fiber (41), the water in the press side vat layer (23) little moves to the wet paper side, whereby the remoisturization of paper is inhibited. Further, the felt is improved in fiber breakaway resistance, wear resistance, and compression fatigue resistance by virtue of the high-viscosity core of the fiber (41).

La présente invention concerne un feutre de presse (10) pour la fabrication de papier qui se compose d~un substrat (30), d~une couche cuve côté papier humide (20) et d~une couche cuve côté presse (23), sachant que la première couche (20) se compose d~une couche cuve dont le côté est en contact avec le papier humide (21) et d~une couche cuve côté substrat (22) ; cette dernière (22) contient une fibre composite âme-gaine (41) constituée d~une âme faite de nylon macromoléculaire ayant une viscosité absolue de 80mPaûs ou supérieure et d~une gaine faite de nylon d~un point de fusion inférieur à celui du nylon constituant l~âme, ainsi que d~une couche cuve côté en contact avec le papier humide (21) faite d~une fibre en nylon (42) exempte de fibre composite (41). Puisque le côté substrat (22) est amélioré en densité par le processus de fusion de la gaine de la fibre (41), l~eau de la couche cuve du côté presse s~écoule peu vers le côté du papier mouillé, de sorte qu~une nouvelle humidification du papier est empêchée. Par ailleurs, le feutre est amélioré dans sa résistance à la rupture, à l~usure et à la fatigue à la compression en vertu de l~âme à haute viscosité de la fibre (41).

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