Air permeable belt for dewatering web in press nip
OwnerLeonard R. Lefkowitzinventor
Life of this patent
Estimating the term…
Abstract
A belt, for a press section, which includes a body portion which is permeable to pressurized gas provided in a press nip and which is substantially impermeable to liquid during passage through the press nip. A press section and method which includes such belt are also provided.
Claims15
An endless belt for a press section, consisting essentially of a first surface an opposite second surface, and a body portion, said body portion being permeable to pressurized gas and substantially impermeable to liquid, said body portion having a first portion adjacent said first surface and a second portion adjacent said second surface, said first portion comprising a plurality of air cavities adjacent and exposed to said first surface, and said second portion comprising a plurality of passageways, each passageway of said plurality of passageways being dimensioned to be permeable to pressurized gas and substantially impermeable to liquid, and extending from said second surface to a select air cavity of said plurality of air cavities.
A press section comprising:
- a first press roll and a second press roll forming a press nip;
- a press felt extending through said press nip for carrying a web through said press nip, said press felt having one surface structured and arranged to engage a first side of said web during operation of said press section;
- and
- a first endless belt extending through said press nip, said first endless belt consisting essentially of a first surface, a second surface opposite said first surface structured and arranged to engage a second side of said web during operation of said press section and a body portion, said body portion being permeable to pressurized gas and substantially impermeable to liquid,
- said body portion having a first portion adjacent said first surface and a second portion adjacent said second surface, said first portion comprising a plurality of air cavities adjacent and exposed to said first surface, and said second portion comprising a plurality of passageways, each passageway of said plurality of passageways being dimensioned to be permeable to pressurized gas and substantially impermeable to liquid, and extending from said second surface to a select air cavity of said plurality of air cavities.
Dependencies are inferred from the claim text.