DOCTOR BLADE ARRANGEMENT AND METHOD IN FIBRE PROCESSING
Apparatus for removing fiber webs from fiber conveying supports are disclosed including a doctor beam, a doctor blade having a web contacting edge, a hose for fluids for applying a force between the doctor beam and the doctor blade when pressurized to move the web contacting edge towards the fiber conveying support, the fiber web having a basis weight over 1000 g/m 2 , the doctor blade and doctor beam being pivotably attached, and the hose arranged for applying the force at a distance form the pivotable attachment to move the web contacting edge by pivoting the doctor blade relative to the doctor beam.
1 . An arrangement for removal of a fiber web from a fiber conveying support, comprising:
a doctor beam;
a doctor blade having a web contacting edge; and
a hose for fluids arranged for applying a force between said doctor beam and said doctor blade when being pressurized to move said web contacting edge towards said fiber conveying support;
said fiber web having a basis weight over 1000 g/m 2 ;
said doctor blade and said doctor beam being attached to each other by a pivotable attachment; and
said hose being arranged for applying said force at a distance from said pivotable attachment to move said web contacting edge by pivoting said doctor blade relative to said doctor beam.
2 . The arrangement according to claim 1 , wherein said hose is provided in a recess in said doctor blade and arranged to actuate on said doctor beam.
3 . The arrangement according to claim 1 , wherein said hose is provided in a recess in said doctor beam and arranged to actuate on said doctor blade.
4 . The arrangement according to claim 1 , wherein said hose is applying said force on said doctor blade at a side opposite to said web contacting edge relative to said pivotable attachment.
5 . The arrangement according to claim 1 , wherein said hose is a gas hose.
6 . The arrangement according to claim 1 , wherein said pivotable attachment is provided by clamping said doctor blade between a main portion of said doctor beam and a clamping plate, in turn mechanically attached to said main portion of said doctor beam.
7 . The arrangement according to any claim 1 , further comprising a hose pressurizing arrangement connected to said hose.
8 . The arrangement according to claim 7 , further comprising a controller arranged for controlling said hose pressurizing arrangement.
9 . A twin-wire press for dewatering of a fiber suspension, comprising lower rolls, an endless lower wire, upper rolls and, an endless upper wire, and an arrangement for removal of a fiber web from at least one of said endless upper wire and said endless lower wire, said arrangement for removal of a fiber web in turn comprising:
a doctor beam;
a doctor blade having a web contacting edge; and
a hose for fluids arranged for applying a force between said doctor beam and said doctor blade when being pressurized to move said web contacting edge towards said fiber conveying support;
said fiber web has a basis weight over 1000 g/m 2 ;
said doctor blade and said doctor beam being attached to each other by a pivotable attachment; and
said hose being arranged for applying said force at a distance from said pivotable attachment to move said web contacting edge by pivoting said doctor blade relative to said doctor beam.
10 . A method for operating an arrangement for removal of a fiber web from a fiber conveying support, comprising the steps of:
pressurizing a hose for fluids arranged for applying a force between a doctor beam and a doctor blade to move a web contacting edge of said doctor blade towards said fiber conveying support;
pivoting said doctor blade relative to said doctor beam by applying said force at a distance from a pivotable attachment between said doctor beam and said doctor blade to provide said moving of said web contacting edge; and
controlling said pressurizing dependent on an operating condition of a device providing said fiber web.
11 . The arrangement according to claim 2 , wherein said hose is applying said force on said doctor blade at a side opposite to said web contacting edge relative to said pivotable attachment.
12 . The arrangement according to claim 3 , wherein said hose is applying said force on said doctor blade at a side opposite to said web contacting edge relative to said pivotable attachment.
13 . The arrangement according to claim 2 , wherein said hose is a gas hose.
14 . The arrangement according to claim 3 , wherein said hose is a gas hose.
15 . The arrangement according to claim 4 , wherein said hose is a gas hose.
16 . The twin-wire press according to claim 9 , wherein said hose is provided in a recess in said doctor blade and arranged to actuate on said doctor beam.
17 . The twin-wire press according to claim 9 , wherein said hose is provided in a recess in said doctor beam and arranged to actuate on said doctor blade.
18 . The arrangement according to claim 9 , wherein said hose is applying said force on said doctor blade at a side opposite to said web contacting edge relative to said pivotable attachment.
19 . The arrangement according to claim 16 , wherein said hose is applying said force on said doctor blade at a side opposite to said web contacting edge relative to said pivotable attachment.
20 . The arrangement according to claim 17 , wherein said hose is applying said force on said doctor blade at a side opposite to said web contacting edge relative to said pivotable attachment.