Cleaning a semipermeable membrane in a papermaking machine
AssigneeVoith Paper Patent GmbH
InventorDavid A. Beck
Life of this patent
Estimating the term…
Abstract
A method of cleaning a semipermeable membrane, the semipermeable membrane being configured for carrying a fiber web, includes the steps of providing a cleaning fluid and applying the cleaning fluid on the semipermeable membrane. Further, an air press configured for carrying the semipermeable membrane therethrough is provided, and the air press has pressurized air therein. The semipermeable membrane is conveyed through the air press and is subjected to the pressurized air within the air press. The pressurized air thereby flushes the cleaning fluid through the semipermeable membrane.
Claims24
A method of cleaning a semipermeable membrane, said semipermeable membrane being configured for carrying a fiber web, said method comprising the steps of:
- providing a cleaning fluid;
- applying said cleaning fluid on said semipermeable membrane;
- providing an air press, said air press being configured for carrying said semipermeable membrane therethrough and removing water from said fiber web, said air press having pressurized air therein;
- conveying said semipermeable membrane through said air press;
- and
- subjecting said semipermeable membrane to said pressurized air within said air press, said pressurized air thereby flushing said cleaning fluid through said semipermeable membrane.
A method of cleaning a semipermeable membrane, said semipermeable membrane being configured for carrying a fiber web, said method comprising the steps of:
- providing a cleaning fluid;
- applying said cleaning fluid on said semipermeable membrane;
- providing an air press, said air press being configured for carrying said semipermeable membrane therethrough, said air press having pressurized air therein;
- conveying said semipermeable membrane through said air press;
- and
- subjecting said semipermeable membrane to said pressurized air within said air press, said pressurized air thereby flushing said cleaning fluid through said semipermeable membrane;
- wherein said air press includes a plurality of rolls, one of said rolls being a cap roll, said applying step including the substep of:
- applying said cleaning fluid on said cap roll;
- and
- transferring said cleaning fluid from said cap roll onto said semipermeable membrane.
A method of cleaning a semipermeable membrane, said semipermeable membrane being configured for carrying a fiber web, said method comprising the steps of:
- providing a cleaning fluid;
- applying said cleaning fluid on said semipermeable membrane;
- providing an air press, said air press being configured for carrying said semipermeable membrane therethrough, said air press having pressurized air therein;
- conveying said semipermeable membrane through said air press;
- and
- subjecting said semipermeable membrane to said pressurized air within said air press, said pressurized air thereby flushing said cleaning fluid through said semipermeable membrane;
- wherein said air press is a cleaning press used for cleaning said semipermeable membrane;
- and
- said cleaning press is further configured for at least one of impregnating and coating the fiber web carried by said semipermeable membrane.
A method of cleaning a semipermeable membrane, said semipermeable membrane being configured for carrying a fiber web, said method comprising the steps of:
- providing a cleaning fluid;
- applying said cleaning fluid on said semipermeable membrane;
- providing an air press, said air press being configured for carrying said semipermeable membrane therethrough, said air press having pressurized air therein;
- conveying said semipermeable membrane through said air press;
- and
- subjecting said semipermeable membrane to said pressurized air within said air press, said pressurized air thereby flushing said cleaning fluid through said semipermeable membrane;
- said air press is a cleaning press used for cleaning said semipermeable membrane;
- and
- further comprising the steps of:
- providing a second air press, said semipermeable membrane having a membrane direction of travel, said second air press being located after said cleaning press in said membrane direction of travel;
- carrying said semipermeable membrane through said second air press;
- and
- dewatering said semipermeable membrane within said second air press.
An apparatus for cleaning a semipermeable membrane, said semipermeable membrane being configured for carrying a fiber web, said apparatus comprising:
- a source of a cleaning fluid;
- an applicator configured for applying said cleaning fluid to said semipermeable membrane;
- and
- an air press configured for carrying said semipermeable membrane therethrough, said air press having pressurized air therein, said air press thereby being configured for flushing said cleaning fluid through said semipermeable membrane.
An apparatus for cleaning a semipermeable membrane, said semipermeable membrane being configured for carrying a fiber web, said apparatus comprising:
- a source of a cleaning fluid;
- an applicator configured for applying said cleaning fluid to said semipermeable membrane;
- and
- an air press configured for carrying said semipermeable membrane therethrough, said air press having pressurized air therein, said air press thereby being configured for flushing said cleaning fluid through said semipermeable membrane;
- wherein said applicator is one of a blade coater, a spray device and a transfer coater and said air press includes a plurality of rolls, one of said rolls being a cap roll, said applicator being said transfer coater, said cap roll functioning as a transfer roll of said transfer coater.
An apparatus for cleaning a semipermeable membrane, said semipermeable membrane being configured for carrying a fiber web, said apparatus comprising:
- a source of a cleaning fluid;
- an applicator configured for applying said cleaning fluid to said semipermeable membrane;
- and
- an air press configured for carrying said semipermeable membrane therethrough, said air press having pressurized air therein, said air press thereby being configured for flushing said cleaning fluid through said semipermeable membrane;
- wherein said air press is a cleaning press used for cleaning the semipermeable membrane, said apparatus further comprising a second air press, the semipermeable membrane having a membrane direction of travel, said second air press being located after said cleaning press in the membrane direction of travel.
A papermaking machine, comprising:
- a semipermeable membrane, said semipermeable membrane being configured for carrying a fiber web;
- a plurality of conveyor rolls, each conveyor roll configured for carrying at least one of said semipermeable membrane and said fiber web;
- a source of a cleaning fluid;
- an applicator configured for applying said cleaning fluid to said semipermeable membrane;
- and
- a press configured for pressing said semipermeable membrane and for thereby flushing said cleaning fluid therethrough.
A papermaking machine, said machine comprising:
- a semipermeable membrane, said semipermeable membrane being configured for carrying a fiber web;
- a plurality of conveyor roll, each conveyor roll configured for carrying at least one of said semipermeable membrane and said fiber web;
- a source of a cleaning fluid;
- an applicator configured for applying said cleaning fluid to said semipermeable membrane;
- and
- an air press configured for carrying said semipermeable membrane therethrough, said air press having pressurized air therein, said air press thereby being configured for flushing said cleaning fluid through said semipermeable membrane.
Dependencies are inferred from the claim text.