US4359829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drying cylinder for paper making machine
Assignee: JM Voith GmbH
•
Filing: 1980-11-20
•
Granted: 1982-11-23
•
Expires: 2000-11-20
Abstract
Abstract The disclosure concerns a drying cylinder for a paper making machine. The drying cylinder is hollow and is circumferentially grooved along the length of its inner surface. A plurality of collector conduits extend axially along the casing. Suction pipes project from each collector into respective ones of the grooves for sucking condensate therefrom. A siphon pipe is connected to each collector for siphoning off the collected condensate. The siphon pipe is insulated to reduce the temperature differential between the interior and exterior thereof. The suction pipes are shaped and/or spaced so that the suction pipes are able to remove a greater amount of condensate from the grooves in the vicinity of the siphon pipe than from the grooves in the remainder of the length of the casing, for attaining more uniform drying performance by the drying cylinder across the width of the web. For example, the suction pipes in the vicinity of the siphon pipe may have a greater diameter or there may be a greater concentration of suction pipes in that vicinity.
Inventors
- 👤 Christian Schiel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:03
CPC Classifications
F; F16; F16C; F16C13/00; D; D21; D21F; D21F5/00; D21F5/02; D21F5/021; D21F5/10
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
265 words
A drying cylinder for a paper making machine, or the like, comprising: a hollow casing, including an external cylinder surface and an inner surface; the inner surface being shaped to define grooves therein and the grooves extending circumferentially around the inner surface; a vapor inlet to the casing; a siphoning arrangement for extracting condensate from the grooves, the arrangement comprising: at least one condensate collector located inside and extending axially of the casing; a siphon pipe connected to the condensate collector for drawing condensate out of the collector through the pipe; the grooves being defined along the casing, both in the vicinity of the siphon pipe and in the region away from the siphon pipe; thermal insulation means for the siphon pipe for reducing the exchange of heat between the outside and inside of the siphon pipe and for reducing deposition of condensate on the external surface of the siphon pipe; a plurality of suction pipes at spaced intervals along the collector and communicating into the collector, and each suction pipe projecting into one of the grooves for suctioning condensate out of the grooves; the presence of the thermal insulation on the siphon pipe and the shape and position of the suction pipes being such that the drying performance of the cylinder on a paper web, or the like, in the vicinity of the siphon pipe is adapted to the drying performance of the cylinder on a paper web, or the like, along the remainder of the length of the casing for avoiding damp stripes on the web in the vicinity of the siphon pipe.
Claim 2
Dependent Claim
265 words
A drying cylinder for a paper making machine, or the like, comprising: a hollow casing, including an external cylinder surface and an inner surface; the inner surface being shaped to define grooves therein and the grooves extending circumferentially around the inner surface; a vapor inlet to the casing; a siphoning arrangement for extracting condensate from the grooves, the arrangement comprising: at least one condensate collector located inside and extending axially of the casing; a siphon pipe connected to the condensate collector for drawing condensate out of the collector through the pipe; the grooves being defined along the casing, both in the vicinity of the siphon pipe and in the region away from the siphon pipe; thermal insulation means for the siphon pipe for reducing the exchange of heat between the outside and inside of the siphon pipe and for reducing deposition of condensate on the external surface of the siphon pipe; a plurality of suction pipes at spaced intervals along the collector and communicating into the collector, and each suction pipe projecting into one of the grooves for suctioning condensate out of the grooves; the presence of the thermal insulation on the siphon pipe and the shape and position of the suction pipes being such that the drying performance of the cylinder on a paper web, or the like, in the vicinity of the siphon pipe is adapted to the drying performance of the cylinder on a paper web, or the like, along the remainder of the length of the casing for avoiding damp stripes on the web in the vicinity of the siphon pipe.
Claim 3
Dependent Claim
20 words
The drying cylinder of claim 1, wherein there are a plurality of the collectors, and each having respective suction pipes.
Claim 4
Dependent Claim
21 words
The drying cylinder of claim 2, wherein there is a respective one of the siphon pipes for each of the collectors.
Claim 5
Dependent Claim
15 words
The drying cylinder of claim 3, wherein the siphon pipes extend radially of the casing.
Claim 6
Dependent Claim
19 words
The drying cylinder of claim 2, wherein the condensate collectors all extend parallel to the axis of the casing.
Claim 7
Dependent Claim
43 words
The drying cylinder of claim 1, wherein there are a plurality of the collectors, each having respective suction pipes; and in which there are a plurality of siphon pipes a respective one of the siphon pipes being provided for each of the collectors.
Claim 8
Dependent Claim
15 words
The drying cylinder of claim 6, wherein the siphon pipes extend radially of the casing.
Claim 9
Dependent Claim
25 words
The drying cylinder of claim 1, wherein the suction pipes are spaced apart along the collector to project into fewer than all of the grooves.
Claim 10
Dependent Claim
20 words
The drying cylinder of claim 8, wherein there are a plurality of the collectors, and each having respective suction pipes.
Claim 11
Dependent Claim
20 words
The drying cylinder of claim 9, wherein the collectors are located radially near to the inner surface of the casing.
Claim 12
Dependent Claim
50 words
The drying cylinder of claim 9, wherein the suction pipes of different ones of the collectors project into different ones of the grooves, such that the grooves into which the suction pipes of one collector do not project have the suction pipes of another of the collectors projecting into them.
Claim 13
Dependent Claim
15 words
The drying cylinder of claim 1, wherein the siphon pipes extend radially of the casing.
Claim 14
Dependent Claim
20 words
The drying cylinder of claim 1, wherein the collectors are located radially near to the inner surface of the casing.
Claim 15
Dependent Claim
201 words
A drying cylinder for a paper making machine, or the like, comprising: a hollow casing, including an external cylinder surface and an inner surface; the inner surface being shaped to define grooves therein; condensate removal means for extracting condensate from the grooves, the removal means comprising: at least one condensate collector located inside and extending axially of the casing; a siphon pipe connected to the condensate collector for draining condensate out of the collector and a plurality of suction pipes at spaced intervals along the siphon pipe connected to the condensate collector for drawing condensate out of the grooves; the suction pipes having a size, shape and position for reducing the quantity of condensate which is accumulated in those of the grooves defined in a first region of the inner surface in the vicinity of the siphon pipe at a first rate and for removing the condensate which is accumulated in those of the grooves defined in a second region removed from the first region at a second rate so that the condensate remaining in those grooves defined in the first region has substantially the equivalent effect on drying as the condensate remaining in those grooves defined in the second region.
Claim 16
Dependent Claim
201 words
A drying cylinder for a paper making machine, or the like, comprising: a hollow casing, including an external cylinder surface and an inner surface; the inner surface being shaped to define grooves therein; condensate removal means for extracting condensate from the grooves, the removal means comprising: at least one condensate collector located inside and extending axially of the casing; a siphon pipe connected to the condensate collector for draining condensate out of the collector and a plurality of suction pipes at spaced intervals along the siphon pipe connected to the condensate collector for drawing condensate out of the grooves; the suction pipes having a size, shape and position for reducing the quantity of condensate which is accumulated in those of the grooves defined in a first region of the inner surface in the vicinity of the siphon pipe at a first rate and for removing the condensate which is accumulated in those of the grooves defined in a second region removed from the first region at a second rate so that the condensate remaining in those grooves defined in the first region has substantially the equivalent effect on drying as the condensate remaining in those grooves defined in the second region.
Claim 17
Dependent Claim
55 words
The drying cylinder of either of claims 1 or 14, wherein the suction pipes are adapted to draw off a greater amount of condensate from the grooves in the vicinity of the siphon pipe, than the suction pipes draw off from the grooves in the region of the casing away from the siphon pipe therein.
Claim 18
Dependent Claim
37 words
The drying cylinder of claim 15, wherein the suction pipes in the vicinity of the siphon pipe have a larger diameter than the other suction pipes in the region of the casing away from the siphon pipe.
Claim 19
Dependent Claim
35 words
The drying cylinder of claim 15, wherein there is a greater concentration of the suction pipes in the vicinity of the siphon pipe than in the region of the casing away from the siphon pipe.
Claim 20
Dependent Claim
39 words
The drying cylinder of either of claims 8 or 14, wherein there is a greater concentration of the suction pipes in the vicinity of the siphon pipe than in the region of the casing away from the siphon pipe.
Claim 21
Dependent Claim
36 words
The drying cylinder of claim 18, wherein in the vicinity of the siphon pipe, the suction pipes project into more closely spaced apart grooves than in the region of the casing away from the siphon pipe.
Claim 22
Dependent Claim
18 words
The drying cylinder of claim 14, wherein the grooves extend circumferentially around the inner surface of the casing.
Claim 23
Dependent Claim
15 words
The drying cylinder of claim 20, wherein the siphon pipes extend radially of the casing.
Claim 24
Dependent Claim
20 words
The drying cylinder of claim 20, wherein the collectors are located radially near to the inner surface of the casing.
Claim 25
Dependent Claim
17 words
The drying cylinder of claim 14, in which the first rate is higher than the second rate.
Claim 26
Dependent Claim
24 words
The drying cylinder of claim 14, in which the first region and the second region extend circumferentially around the inner surface of the casing.
Claim 27
Dependent Claim
34 words
The drying cylinder of claim 14, wherein the condensate removal means further comprises thermal insulation means for the pipe for reducing the exchange of heat between the outside and inside of the siphon pipe.
Claim 28
Dependent Claim
26 words
The drying cylinder of claim 1 or claim 25 in which the thermal insulation means is a layer disposed around the outside of the siphon pipe.
Claim 29
Dependent Claim
21 words
The drying cylinder of claim 1 or claim 14 further comprising means for introducing vapor which forms condensate into the casing.
References Cited (Backward Citations)
US2297094A
Cited
US3241251A
Cited
US3299531A
Cited
US3721016A
Cited
US3659349A
Cited
FR2320519A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-11-22 | 1986-05-24 | 1986-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-22 | 1990-05-24 | 1990-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-22 | 1994-05-24 | 1994-11-23 | $7700.00 | Window Closed / Lapsed |