Process for producing viscose hoses by precipitation

Details Process for producing viscose hoses by precipitation Process for producing viscose hoses by precipitation

A - Human Necessities

22

C

A22C 13/00 (2006.01)

Patent

CA 2204987

The present invention relates to a method for the production of a fibre- reinforced cellulose tube by continuous coating of a fibrous non-woven fabric with an alkaline viscose solution which is neutralised by means of an acid-containing precipitating liquid and is converted into regenerated cellulose, wherein on the path between viscose coating and immersion in the precipitating bath, aqueous, acid- containing precipitating agents are caused to act upon the fresh viscose tube within the tube for the purpose of stiffening and regeneration to form regenerated cellulose, the process being begun with the application of the precipitating liquid directly after conclusion of the embedding of fibre in viscose and the precipitating liquid being guided together with the tube with the aid of optionally fixed internal devices which are designed in such a way that they support the tube that has had precipitating bath applied to it and in the proceas maintain it in rounded shape, that the length of the inner preliminary precipitation path is designed to be up to 10 metres in length, preferably 2 to 6 metres, in order to achieve an intensive preliminary precipitation and the acid concentration is such that the partial stiffening becoming effective within the tube as a result of formation of regenerated cellulose does not hinder the uniform distribution of the aqueous outer viscose including embedding of fibre.

L'invention concerne un procédé de production d'un tuyau souple en cellulose renforcé par des fibres par enduction en continu d'un non-tissé fibreux avec une solution alcaline de viscose neutralisée par un liquide de précipitation acide et transformé en un produit régénéré de cellulose. Des milieux aqueux acides de précipitation sont appliqués sur l'intérieur du tuyau souple frais en viscose dans la section qui s'étend entre le poste d'enduction en viscose et l'immersion dans le bain de précipitation afin de consolider et de régénérer le produit régénéré de cellulose. On commence à appliquer le liquide de précipitation immédiatement après que les fibres aient été enrobées de viscose et le liquide de précipitation est guidé avec le tuyau à travers des agencements intérieurs de support, le cas échéant fixes, qui soutiennent le tuyau mouillé dans le bain de précipitation et maintiennent sa forme arrondie. La section de précipitation préalable sur l'intérieur du tuyau mesure jusqu'à 10 mètres de longueur, de préférence entre 2 et 6 mètres, afin d'assurer une précipitation intensive. La concentration en acide est sélectionnée pour que la consolidation partielle de l'intérieur du tuyau flexible par formation du produit régénéré de cellulose ne gêne ni la répartition uniforme de la viscose aqueuse sur l'extérieur du tuyau ni l'enrobage des fibres.

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