Method and apparatus for screening waste paper pulp

Details Method and apparatus for screening waste paper pulp Method and apparatus for screening waste paper pulp

D - Textiles, Paper

21

D

D21D 5/06 (2006.01) D21D 5/02 (2006.01)

Patent

CA 2133630

METHOD AND APPARATUS FOR SCREENING WASTE PAPER PULP ABSTRACT OF THE DISCLOSURE Waste paper stock pulp slurry supplied through a stock inlet is separated at screening-sections to a high quality stock and a reject containing contaminants and undefibered waste paper. The high quality stock is sent to a next stage as accept. The reject is sent to a defibering section and is diluted after defibration, part of the reject being circulated to the screening sections, the remainder being discharged out of the system through a reject outlet. Provision of screening and defibering sections in one and the same screen can satisfy contradictory requirements, i.e., to increase contaminant removing efficiency, to raise production yield and to attain space- and cost- saving.

METHODE ET APPAREIL POUR CLASSER LA PATE DE VIEUX PAPIERS De la bouillie de pâte de vieux papiers admise par une entrée est séparée à des stations de classage en stock de haute qualité, en rejet contenant des contaminants et en vieux papier non défibré. Le stock de haute qualité est envoyé à la prochaine étape comme produit accepté. Le rejet est envoyé à une station de défibrage et ensuite dilué, une partie du rejet étant retournée aux stations de classage, le restant étant évacué par une sortie. La disposition des stations de classage et de défibrage utilisant le même classeur à tamis peut satisfaire à des exigences contradictoires, c'est-à-dire augmenter l'efficacité du retrait des contaminants et le rendement de la production et réussir à réduire les coûts et l'espace.

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