Method and apparatus for producing fibre pulp from fibrous...

D - Textiles – Paper – 21 – F

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92/52

D21F 1/00 (2006.01)

Patent

CA 1221262

ABSTRACT OF THE DISCLOSURE In a method and device for producing fibre pulp from fibrous lignocellulose containing raw material, such material is subjected to preheating in a preheater by means of steam and thereafter to grinding at increased pressure of steam or gas between grinding discs which rotate relatively to one another in a grinding apparatus into fibre pulp which is propelled from the apparatus housing by means of the steam or gas into a separation device which is similarly maintained under steam pressure and in which the steam is separated from the pulp. The material is con- veyed not only to the preheater but also from the latter to the grinding apparatus via a steamtight conveyor. An increased pres- sure of steam or gas is created at this stage in the grinding apparatus compared to that in the preheater such that the steam proceeding from the grinding apparatus to the receiving device is conveyed further by means of this higher pressure to the pre- heater, there being responsible for preheating the material to over 100°C.

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