Upgrading of tmp to an sc/lwc quality

D - Textiles – Paper – 21 – D

Patent

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D21D 1/20 (2006.01) D21D 5/02 (2006.01)

Patent

CA 2350988

The present invention relates to a process for production of upgraded TMP to SC/LWC qualities. The newsprint pulp is pumped to an LC-refiner (1) in which the average fibre length is reduced, and is then transferred to a primary screen (2) in which the pulp is divided into a primary accept and a primary reject with the aid of a slotted screen basket which has a narrow slot width. The primary accept is transferred to the main line, where the primary reject is dewatered and then refined in an HC-refiner (3). The refined primary reject is then transferred to a secondary screen (4) in which the reject is divided into a secondary accept and a secondary reject with the aid of a slotted screen basket which has a narrow slot width. The secondary accept is returned to the main line and mixed with the primary accept from the primary screen.

La présente invention concerne un procédé de fabrication de pâte à papier thermomécanique de qualité supérieure pour papier d'édition surcalandré/papier mince couché. La pâte à papier journal est pompée dans un raffineur pour faible consistance (1) dans lequel la longueur de fibre moyenne est réduite, puis elle est transférée dans un filtre primaire (2) où la pâte est répartie en pâte primaire acceptée et en rejet primaire à l'aide d'un tamis à rainure étroite. La pâte primaire acceptée est transférée vers la conduite principale, où le rejet primaire est épuré puis raffiné dans un raffineur pour haute consistance (3). Le rejet primaire raffiné est alors transféré dans un filtre secondaire (4) où le rejet est réparti en pâte secondaire acceptée et en rejet secondaire à l'aide d'un tamis à rainure étroite. La pâte secondaire acceptée est renvoyée à la conduite principale où elle est mélangée avec la pâte primaire acceptée du filtre primaire.

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