Patent US4688335A successfully refreshed from Google Patents.
US4688335A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method for drying fibrous web material
Assignee: Fort James Corp
•
Filing: 1986-02-18
•
Granted: 1987-08-25
•
Expires: 2006-02-18
Abstract
Abstract A dryer for paper and similar fibrous web materials including a dryer roll having an outer cylindrically-shaped wall, a radiant heat source within the dryer roll adapted to heat the wall substantially uniformly about the entire periphery thereof, and nip-forming means forming a pressure nip with the dryer roll.
Inventors
- 👤 Wayne V. Krill
- 👤 Richard P. Taylor
- 👤 Thomas Wong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:09
CPC Classifications
F; F26; F26B; F26B23/00; F26B23/02; F26B13/00; F26B13/10; F26B13/14; F26B13/18; F26B13/183; F26B13/186
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
163 words
Apparatus for drying fibrous web material comprising: a dryer roll mounted for rotatable movement, said dryer roll including an outer cylindrically-shaped wall and side walls cooperating with said cylindrically-shaped wall to define an interior; a radiant heat source disposed within the interior of said dryer roll and adapted to heat said cylindrically-shaped wall substantially uniformly about the entire periphery thereof, said radiant heat source comprising a burner mounted within the interior of said dryer roll, said burner including a cylindrically-shaped shell comprising at least one layer of ceramic fiber matrix with interstitial spaces between the fibers, said shell being coaxially disposed with respect to said dryer roll cylindrically-shaped wall; means for introducing a flow of air-fuel mixture into the shell and outwardly through the spaces defined by the fibers of the fiber matrix whereby combustion takes place at the fiber matrix; and nip forming means forming a pressure nip with said dryer roll, said nip adapted to accommodate web material to be dried.
Claim 2
Dependent Claim
163 words
Apparatus for drying fibrous web material comprising: a dryer roll mounted for rotatable movement, said dryer roll including an outer cylindrically-shaped wall and side walls cooperating with said cylindrically-shaped wall to define an interior; a radiant heat source disposed within the interior of said dryer roll and adapted to heat said cylindrically-shaped wall substantially uniformly about the entire periphery thereof, said radiant heat source comprising a burner mounted within the interior of said dryer roll, said burner including a cylindrically-shaped shell comprising at least one layer of ceramic fiber matrix with interstitial spaces between the fibers, said shell being coaxially disposed with respect to said dryer roll cylindrically-shaped wall; means for introducing a flow of air-fuel mixture into the shell and outwardly through the spaces defined by the fibers of the fiber matrix whereby combustion takes place at the fiber matrix; and nip forming means forming a pressure nip with said dryer roll, said nip adapted to accommodate web material to be dried.
Claim 3
Dependent Claim
45 words
The dryer according to claim 1 wherein said nip forming means includes a driven rotatable press roll urged toward said cylindrically-shaped wall at a predetermined roll load pressure, said dryer roll being freely rotatably mounted whereby said dryer roll is driven by said press roll.
Claim 4
Dependent Claim
39 words
The dryer according to claim 2 wherein a felt is disposed between said dryer roll and said press roll, the web material dried by said dryer being sandwiched between said felt and the cylindrically-shaped wall of said dryer roll.
Claim 5
Dependent Claim
32 words
The dryer according to claim 3 wherein said radiant heat source substantially uniformly heats said cylindrically-shaped wall to a temperature within the range of from about 600° F. to about 800° F.
Claim 6
Dependent Claim
49 words
The dryer according to claim 1 wherein said dryer roll and said burner are mounted coaxially on a tubular element, said tubular element defining at least one inlet for receiving air and fuel and at least one outlet within said shell for delivering an air-fuel mixture to said shell.
Claim 7
Dependent Claim
42 words
The dryer according to claim 5 wherein a centerbody is disposed within said shell to define a confined space between said centerbody and said ceramic fiber matrix, said outlet defined by said tubular element being in direct communication with said confined space.
Claim 8
Dependent Claim
24 words
The dryer according to claim 1 wherein a side wall of said dryer roll defines an outlet for combustion products produced by said burner.
Claim 9
Dependent Claim
20 words
The dryer according to claim 5 wherein said dryer roll is rotatably mounted on bearings supported by said tubular element.
Claim 10
Dependent Claim
31 words
The dryer according to claim 8 wherein protective means is disposed around at least one of said bearings to protect said at least one bearing from heat generated by said burner.
Claim 11
Dependent Claim
33 words
The dryer according to claim 9 wherein said protective means includes a bearing housing and a baffle disposed about said housing to deflect combustion products produced by said burner away from said housing.
Claim 12
Independent Claim
153 words
A method of drying fibrous web material, comprising the steps of: forming a press nip between a dryer roll having a cylindrically-shaped wall defining an interior and a press roll; passing web material through said nip by rotating said rolls; positioning a radiant heat source within said dryer roll interior, said radiant heat source including a cylindrically-shaped shell comprising at least one layer of ceramic fiber matrix with interstitial spaces between the fibers, said shell being coaxially positioned relative to said dryer roll cylindrically-shaped wall, introducing a flow of air-fuel mixture into the shell and flowing the mixture outwardly through the spaces defined by the fibers of the fiber matrix; and energizing said radiant heat source by igniting the air-fuel mixture, with combustion taking place at the fiber matrix, to heat said cylindrically-shaped wall substantially uniformly about the entire periphery thereof to at least partially dry the web material passing through said nip.
Claim 13
Independent Claim
153 words
A method of drying fibrous web material, comprising the steps of: forming a press nip between a dryer roll having a cylindrically-shaped wall defining an interior and a press roll; passing web material through said nip by rotating said rolls; positioning a radiant heat source within said dryer roll interior, said radiant heat source including a cylindrically-shaped shell comprising at least one layer of ceramic fiber matrix with interstitial spaces between the fibers, said shell being coaxially positioned relative to said dryer roll cylindrically-shaped wall, introducing a flow of air-fuel mixture into the shell and flowing the mixture outwardly through the spaces defined by the fibers of the fiber matrix; and energizing said radiant heat source by igniting the air-fuel mixture, with combustion taking place at the fiber matrix, to heat said cylindrically-shaped wall substantially uniformly about the entire periphery thereof to at least partially dry the web material passing through said nip.
Claim 14
Dependent Claim
16 words
The method according to claim 11 wherein said dryer roll is driven by said press roll.
Claim 15
Dependent Claim
42 words
The method according to claim 11 including the additional step of disposing a felt between said dryer roll and said press roll, the web material dried by said dryer being sandwiched between said felt and the cylindrically-shaped wall of said dryer roll.
Claim 16
Dependent Claim
32 words
The method according to claim 11 wherein said radiant heat source substantially uniformly heats said cylindrically-shaped wall to a temperature within the range of from about 600° F. to about 800° F.
Claim 17
Dependent Claim
58 words
The method according to claim 11 including the step of coaxially mounting the shell and the dryer roll on a tubular element, said tubular element defining at least one inlet and at least one outlet, disposing said outlet within said shell, and flowing said air-fuel mixture from said inlet within said tubular element and out of said shell.
Claim 18
Dependent Claim
37 words
The method of claim 15 including the step of defining a confined space between a centerbody and said ceramic fiber matrix, said outlet defined by said tubular element being placed in direct communication with said confined space.
Claim 19
Dependent Claim
36 words
The method according to claim 11 wherein the dryer roll includes side walls and including the additional step of venting combustion products produced by said radiant heat source through an outlet formed in a side wall.
Claim 20
Dependent Claim
48 words
The method according to claim 11 wherein said dryer roll is rotatably mounted on bearings, said method including the additional step of positioning a baffle adjacent to at least one of said bearings to shield said at least one bearing from heat generated by said radiant heat source.
References Cited (Backward Citations)
US2362947A
Cited
US3919783A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-24 | 1991-02-23 | 1991-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-24 | 1995-02-23 | 1995-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-24 | 1999-02-23 | 1999-08-25 | $7700.00 | Window Closed / Lapsed |