Paper making and fiber liberation – Apparatus – Digester
Reexamination Certificate
2005-06-28
2005-06-28
Halpern, Mark (Department: 1731)
Paper making and fiber liberation
Apparatus
Digester
C162S261000, C162S234000, C162S004000, C162S055000, C162S057000, C241S079300, C241S079200, C241S024100, C241S024110
Reexamination Certificate
active
06911118
ABSTRACT:
A pulper for producing paper pulp from waste paper containing undesired scrap particles includes a container (1) forming a chamber (4) defined by a bottom wall (5) and a cylindrical circumferential wall (6). A paper tearing member (7) is arranged in the chamber closed to the bottom wall and is rotatable in a horizontal direction of rotation about the centre axis of the cylindrical wall. The bottom wall and the circumferential wall forms a substantially circular peripheral reject chute (11) situated under the paper tearing member for collecting reject including undesired scrap particles. The reject chute extends helically in the direction of rotation of the paper tearing member from an upper end (12) of the reject chute downwardly to a lower end (13) of the reject chute. The circumferential wall (6) has a substantially cylindrical shape and extends vertically to the reject chute (11). A discharge element (2) is adapted to discharge reject in batches from the reject chute.
REFERENCES:
patent: 4052009 (1977-10-01), Penque
patent: 0 530 124 (1993-03-01), None
Halpern Mark
JLR Pulping Systems AB
Young & Thompson
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