Machine and process for producing a tissue web
AssigneeVoith Paper Patent GmbH
InventorsThomas Thoröe Scherb, Harald Schmidt-Hebbel
Life of this patent
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Abstract
The present invention is directed to a machine and process for producing a tissue web. The machine includes a forming area including at least one rotating continuous dewatering wire with zonally varied wire permeability, and at least one shoe press. The process includes dewatering the tissue web with at least the at least one continuous dewatering wire with zonally varied wire permeability, and pressing the tissue web in the at least one shoe press.
Claims52
A machine for producing a tissue web comprising:
- a forming area including at least one rotating continuous dewatering wire with a plurality of zones having different wire permeabilities;
- and
- at least one shoe press located downstream of said forming area, with respect to a web travel direction,
- wherein said at least one shoe press has a press nip length, viewed in a belt travel direction, greater than about 80 mm and has a pressure profile over said press nip length with a maximum pressing pressure less than or equal to about 2 MPa.
A process for producing a tissue web in a tissue machine having a forming area including at least one rotating continuous dewatering wire with a plurality of zones having different wire permeabilities and at least one shoe press, the process comprising:
- dewatering the tissue web with at least the at least one continuous dewatering wire with the plurality of zones having different wire permeabilities;
- and
- pressing the tissue web in the at least one shoe press, which has a press nip length, viewed in a belt travel direction, greater than about 80 mm and which is located downstream of the forming area, such that a pressure profile over the press nip length has a maximum pressing pressure less than or equal to about 2 MPa.
An tissue paper former comprising:
- a forming element;
- at least two rotating continuous dewatering wires, in which at least one of said two rotating continuous dewatering wires has a plurality of zones with different wire permeabilities, arranged over said forming element, as an outer wire not in contact with said forming element and as an inner wire;
- and
- at least one shoe press arranged downstream, relative to a wire travel direction, from said forming element,
- wherein said at least one shoe press has a press nip length, viewed in a belt travel direction, greater than about 80 mm and has a pressure profile over said press nip length with a maximum pressing pressure less than or equal to about 2 MPa.
Dependencies are inferred from the claim text.