US4170457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air separator method and apparatus
Assignee: Black Clawson Co
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Filing: 1978-05-04
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Granted: 1979-10-09
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Expires: 1998-05-04
Abstract
Abstract A rotating separator removes air coating from pigmented paper coating liquid stock. The separator employs a cylindrical tank which is mounted for rotation about a vertical axis. The separator is operated in a filled condition and an air laden or froth fraction is removed from a radially central region of the tank at the top of the tank, while a non-rotating pickup receives air free coating from a region adjacent the wall of the tank near the tank bottom. A method of treating and applying such a coating includes the steps of pumping an air laden coating into a centrifugal separator while maintaining the separator in a filled condition, removing an air froth from the separator for return to the supply tank, and delivering a substantially air free coating directly to the inlet of a control without the imposition of any intermediate pumping apparatus. The centrifugal pumping action of the separator supplements the pressure head on the coating material.
Inventors
- 👤 Richard S. Tetro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:35
CPC Classifications
D; D21; D21D; D21D5/00; D21D5/26; B; B01; B01D; B01D19/00; B01D19/0042; B01D19/0052; B01D19/0068; F; F04; F04D; F04D1/00; F04D1/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
143 words
A method of removing entrained air from liquid paper coating material for subsequent application of such material to a moving web of paper by means of a coater having an inlet for liquid coating material, comprising the steps of providing a quantity of liquid coating material containing a quantity of entrained air bubbles therein, supplying said liquid coating material under a positive head of pressure to the interior of a tank-type rotating centrifugal separator and maintaining the separator in a substantially full condition, continuously removing said air laden coating material from a radially central region of said separator, continuously removing substantially air free coating material from a radially outer region of said separator, and conveying said air free coating material directly to said coater inlet without the imposition of intermediate pumping apparatus for application by said coater to a moving web of paper.
Claim 2
Independent Claim
143 words
A method of removing entrained air from liquid paper coating material for subsequent application of such material to a moving web of paper by means of a coater having an inlet for liquid coating material, comprising the steps of providing a quantity of liquid coating material containing a quantity of entrained air bubbles therein, supplying said liquid coating material under a positive head of pressure to the interior of a tank-type rotating centrifugal separator and maintaining the separator in a substantially full condition, continuously removing said air laden coating material from a radially central region of said separator, continuously removing substantially air free coating material from a radially outer region of said separator, and conveying said air free coating material directly to said coater inlet without the imposition of intermediate pumping apparatus for application by said coater to a moving web of paper.
Claim 3
Independent Claim
174 words
A method of removing entrained air from liquid paper coating material for subsequent application of such material to a moving web of paper by means of a coater having an inlet for liquid coating material, comprising the steps of providing a supply of liquid coating material containing a quantity of entrained air bubbles therein, deliverying said coating material from said supply to the inlet of a pump, deliverying the coating material from the outlet of said pump to a rotating tank-type centrifugal separator under a positive head of pressure from said pump and maintaining the separator in a substantially full condition, continuously removing said air laden coating from a radially central region of said separator, continuously removing substantially air free coating from a radially outer region of said separator, and conveying said air free coating directly to the inlet of the coater under the cumulative head of said pump and the head induced by said separator without the imposition of intermediate pumping apparatus for application by said coater to a moving web of paper.
Claim 4
Independent Claim
174 words
A method of removing entrained air from liquid paper coating material for subsequent application of such material to a moving web of paper by means of a coater having an inlet for liquid coating material, comprising the steps of providing a supply of liquid coating material containing a quantity of entrained air bubbles therein, deliverying said coating material from said supply to the inlet of a pump, deliverying the coating material from the outlet of said pump to a rotating tank-type centrifugal separator under a positive head of pressure from said pump and maintaining the separator in a substantially full condition, continuously removing said air laden coating from a radially central region of said separator, continuously removing substantially air free coating from a radially outer region of said separator, and conveying said air free coating directly to the inlet of the coater under the cumulative head of said pump and the head induced by said separator without the imposition of intermediate pumping apparatus for application by said coater to a moving web of paper.
Claim 5
Dependent Claim
245 words
A separator for removing air bubbles and other entrained gas and air particles from a source of paper coating liquids under pressure, comprising: a generally vertically oriented cylindrical tank having a closed top, a closed bottom, and a cylindrical side wall, and adapted to be operated in a substantially filled condition, means mounting said tank for rotation about a generally vertical axis, means in said tank top defining a coating liquid inlet positioned to deliver air laden coating liquid generally tangentially of the side wall of said tank adjacent the upper end thereof and in the direction of tank rotation, coating supply conduit means connecting said source of coating liquid to said inlet for admitting coating into said tank under pressure from said source, means in said tank defining a first outlet which extends through said tank top and which opens into said tank substantially at a central region thereof adjacent said top for extraction therefrom of separated air laden coating for return thereof to said supply, means in said tank defining a second outlet having a liquid inlet orifice spaced axially from said tank bottom adjacent the side wall of said tank in non-rotating relation to said wall to intercept air free coating liquid for delivery thereof to a coater, and means for rotating said tank about said axis in the direction of flow of liquid from said coating liquid inlet to impart a corresponding rotation to the body of liquid within said tank.
Claim 6
Dependent Claim
245 words
A separator for removing air bubbles and other entrained gas and air particles from a source of paper coating liquids under pressure, comprising: a generally vertically oriented cylindrical tank having a closed top, a closed bottom, and a cylindrical side wall, and adapted to be operated in a substantially filled condition, means mounting said tank for rotation about a generally vertical axis, means in said tank top defining a coating liquid inlet positioned to deliver air laden coating liquid generally tangentially of the side wall of said tank adjacent the upper end thereof and in the direction of tank rotation, coating supply conduit means connecting said source of coating liquid to said inlet for admitting coating into said tank under pressure from said source, means in said tank defining a first outlet which extends through said tank top and which opens into said tank substantially at a central region thereof adjacent said top for extraction therefrom of separated air laden coating for return thereof to said supply, means in said tank defining a second outlet having a liquid inlet orifice spaced axially from said tank bottom adjacent the side wall of said tank in non-rotating relation to said wall to intercept air free coating liquid for delivery thereof to a coater, and means for rotating said tank about said axis in the direction of flow of liquid from said coating liquid inlet to impart a corresponding rotation to the body of liquid within said tank.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-10-08 | 1983-04-09 | 1983-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-08 | 1987-04-09 | 1987-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-08 | 1991-04-09 | 1991-10-09 | $7700.00 | Window Closed / Lapsed |