Drying section with impingement drying unit
AssigneeVoith Paper Patent GmbH
InventorsPeter Kahl, Markus Oechsle, Wolfgang Mayer, Georg Kugler, Roland Mayer
Life of this patent
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Abstract
In a drying section of a machine for producing a material web such as, in particular, a paper or cardboard web, a pick-up suction roll, in particular a larger pick-up suction roll, is provided between the last pressing nip of a pressing section and a subsequent impingement drying unit, which suction roll removes the material web from a pressing felt guided through the pressing nip or from a transfer belt and transfers it to the impingement drying unit.
Claims49
A drying section of a machine for producing a material web located downstream, relative to a web travel direction, from a pressing section comprising:
- an impingement drying unit;
- a pick-up suction roll positioned between a last pressing nip of the pressing section and said impingement drying unit, said pick-up suction roll having an outer diameter of in the range of approximately 1.2 to approximately 2.5 m;
- one of a pressing felt guided through the last pressing nip and a transfer belt arranged to guide the material web,
- wherein said pick-up suction roll is arranged to transfer the material web from the one of the pressing felt and the transfer belt to said impingement drying unit.
A drying section of a machine for producing a material web located downstream, relative to a web travel direction, from a pressing section comprising:
- an impingement drying unit;
- a pick-up suction roll positioned between a last pressing nip of the pressing section and said impingement drying unit;
- and
- one of a pressing felt guided through the last pressing nip and a transfer belt arranged to guide the material web,
- wherein said pick-up suction roll is arranged to transfer the material web from the one of the pressing felt and the transfer belt to said impingement drying unit,
- wherein said at least one impingement drying unit comprises a hood having at least one of hole-type nozzles and suction slots, and
- wherein said suction slits are covered by diaphragms to protect them from scraps.
A drying section of a machine for producing a material web located downstream, relative to a web travel direction, from a pressing section comprising:
- an impingement drying unit;
- a pick-up suction roll positioned between a last pressing nip of the pressing section and said impingement drying unit;
- and
- one of a pressing felt guided through the last pressing nip and a transfer belt arranged to guide the material web,
- wherein said pick-up suction roll is arranged to transfer the material web from the one of the pressing felt and the transfer belt to said impingement drying unit,
- wherein said at least one impingement drying unit comprises a hood having at least one of hole-type nozzles and suction slots, and
- wherein said hole-type nozzles have a diameter within a range of between approximately 6 to approximately 10 mm.
A drying section of a machine for producing a material web located downstream, relative to a web travel direction, from a pressing section comprising:
- an impingement drying unit;
- a pick-up suction roll positioned between a last pressing nip of the pressing section and said impingement drying unit;
- and
- one of a pressing felt guided through the last pressing nip and a transfer belt arranged to guide the material web,
- wherein said pick-up suction roll is arranged to transfer the material web from the one of the pressing felt and the transfer belt to said impingement drying unit,
- wherein said at least one impingement drying unit comprises a hood having at least one of hole-type nozzles and suction slots, and
- wherein said suction slots are covered by diaphragms which are arranged to provide an open nozzle surface in a range of between approximately 1.5 to approximately 3.5%.
Dependencies are inferred from the claim text.