US3452446A - Apparatus for the ventilation of a paper machine - Google Patents
Apparatus for the ventilation of a paper machine Download PDFInfo
- Publication number
- US3452446A US3452446A US643474A US3452446DA US3452446A US 3452446 A US3452446 A US 3452446A US 643474 A US643474 A US 643474A US 3452446D A US3452446D A US 3452446DA US 3452446 A US3452446 A US 3452446A
- Authority
- US
- United States
- Prior art keywords
- casing
- air
- ventilation
- dryer section
- drying
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G9/00—Other accessories for paper-making machines
Definitions
- the present invention relates to an apparatus for the ventilation of a paper machine, comprising a casing for the dryer section of the paper machine, which casing includes a roof, side walls and end walls, means for the supply of ventilation air to the casing and means for the removal of ventilation air from the casing.
- the ventilation air is supplied through the basement floor below the dryer section or immediately below the usual lower drying felts, and removed through a gap or openings along the longitudinal central line of the roof.
- a cylinder dryer section is never symmetric with respect to the central portion of the paper web, because on one side thereof there are arranged the transmissions for the operation of the drying cylinders and the steam fittings for the heating of the cylinders.
- Said fittings comprise a great number of hot pipes, which produce thermal forces tending to press up great amounts of air on this side. Under these conditions an air flow across the machine easily can develop.
- the vertical flow areas on both sides of the machine can have different size, which also contributes to the development of a cross flow.
- a ventilation apparatus has been achieved, by which the cross-flow tendencies and, thereby, the uneven drying profile can be controlled.
- Said apparatus is characterized in that the means for the removal of ventilation air from the casing comprise exhaust passages extending horizontally along each of the side walls adjacent the roof, which passages communicate both with the dryer section via openings in the passage walls and with gas transport means associated with the last-mentioned means, said means for the removal of drying air being arranged such that the amount of ventilation air removed per time unit from the casing via the exhaust passages can be adjusted individually for every passage.
- FIG. 1 is a cross sectional view through a dryer section in a paper machine having ventilation apparatus made in accordance with the present invention.
- FIG. 2 is a diagrammatic sectional view taken on the line 2-2 of FIG. 1.
- the drying section comprises a machine stand 1 and a number of drying cylinders 2, about which the paper web is directed in a zigzag path.
- the machine stand is supported on so-called supporting strands 3 of concrete.
- a light-weight frame 4 is mounted carrying the upper portion of the casing.
- the right-hand portion of the machine stand 1 includes the transmission for the operation of the drying cylinders. To the right of the transmission the steam and condenser tubes 5 for the heating of the drying cylinders are located.
- the casing comprises of a roof 6, a side wall 7 on the machine operators side, a side wall 8 on the driving side of the machine and two end walls (not shown).
- a number of liftable doors 9 and a number of slidable doors 10 are provided in the side wall 7 on the operators side and a number of slidable doors 11 are provided in the side wall 8 on the driving side.
- the casing For removing by ventilation the Water vapour which evaporates from the drying paper web the casing is supplied with heated ventilation air through a passage 12 which extends along the central line of the machine in the basement floor below the dryer section.
- the upper wall of the passage, along the length of the dryer section, is provided with a number of slots 13 for distributing the ventilation air supplied through the passage.
- two exhaust passages 14 and 15 are arranged to extend horizontally below the roof 6 adjacent to each of the side walls 7 and 8 along the entire length of the dryer section.
- the exhaust passages 14, 15 communicate with the dryer section via openings 16, 17 in the passage walls and with the suction side of a number of exhaust fans 3 18 via ducts 19, 20, 21.
- the openings 16 17 in the passage walls are uniformly distributed along the length of the dryer section and provided with sliding dampers 22, 23 for controlling and adjusting the distribution of the exhausted ventilation air in accordance with the drying intensity in the different parts of the dryer section.
- One reason which strongly contributes to said profile is the thermally caused air motion about the steam fittings on the drive side of the machine. Further contributions can be effected by the aforementioned leakage areas,
- the exhaust on two sides according to the invention renders it possible to eliminate the cross flows. It is, for example, possible to counteract and neutralize an air flow flowing horizontally between the drying cylinders past the paper web from the drive side to the operators side by increasing the air amount removed through the exhaust passage of the drive side from the casing or, more correctly, by changing the relation between the air amounts removed through the two exhaust passages.
- This change is eifected by a continuously adjustable change-over valve 24 located in the meeting point between the ducts 19, 20 from the exhaust passages 14, 15.
- a valve 24 is provided for each of the fans 18.
- the arrangement offers simple but effective possibilities of controlling the air flow in the casing to the degree required.
- An apparatus for ventilation of a paper machine comprising a housing completely enclosing the cylinder dryer section of the paper machine, which housing includes a roof, side walls and end walls, means for the supply of ventilation air to the housing including an air distribution channel disposed below the drying cylinders and extending along the entire dryer section, and means for the exhaustion of the ventilation air
- the means for the exhaustion of the ventilation air comprises two separate exhaust ducts extending horizontally along each of the side walls of the housing adjacent the roof of same, said exhaust ducts communicating with the dryer section through a number of openings uniformly interspaced along the length of the dryer section, each opening being provided with an individually adjustable damper, at least one exhaustion fan at least one transverse passage interconnecting both of the two exhaust ducts to the exhaustion fan, and an adjustable change-over damper in said passage whereby the amount of exhausted ventilation air can be individually adjusted for each exhaust duct, and the distribution of the exhausted ventilating air is adjustable along the length of the dryer section.
Landscapes
- Drying Of Solid Materials (AREA)
- Paper (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8075/66A SE322408B (fi) | 1966-06-14 | 1966-06-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3452446A true US3452446A (en) | 1969-07-01 |
Family
ID=20273083
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US643474A Expired - Lifetime US3452446A (en) | 1966-06-14 | 1967-06-05 | Apparatus for the ventilation of a paper machine |
Country Status (9)
Country | Link |
---|---|
US (1) | US3452446A (fi) |
AT (1) | AT288147B (fi) |
BE (1) | BE699910A (fi) |
DE (1) | DE1561641A1 (fi) |
ES (1) | ES341742A1 (fi) |
FI (1) | FI45124C (fi) |
GB (1) | GB1162877A (fi) |
NL (1) | NL6708253A (fi) |
SE (1) | SE322408B (fi) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110132709A1 (en) * | 2008-08-21 | 2011-06-09 | Exedy Corporation | Torque converter |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10335580A1 (de) * | 2003-07-31 | 2005-02-24 | Voith Paper Patent Gmbh | Vorrichtung zur Führung einer laufenden Faserstoffbahn |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2000546A (en) * | 1931-04-18 | 1935-05-07 | John O Woodsome | Paper drying process and apparatus |
US2909847A (en) * | 1955-10-17 | 1959-10-27 | Beloit Iron Works | Dryer section arrangement for paper machines |
US2910784A (en) * | 1957-10-10 | 1959-11-03 | Midland Ross Corp | Drying equalizer arrangement |
US2977686A (en) * | 1959-02-19 | 1961-04-04 | Jamar Olmen Company | Apparatus for the manufacture of paper |
-
1966
- 1966-06-14 SE SE8075/66A patent/SE322408B/xx unknown
-
1967
- 1967-06-05 US US643474A patent/US3452446A/en not_active Expired - Lifetime
- 1967-06-06 AT AT528867A patent/AT288147B/de not_active IP Right Cessation
- 1967-06-08 GB GB26562/67A patent/GB1162877A/en not_active Expired
- 1967-06-09 FI FI671634A patent/FI45124C/fi active
- 1967-06-12 DE DE19671561641 patent/DE1561641A1/de active Pending
- 1967-06-13 ES ES341742A patent/ES341742A1/es not_active Expired
- 1967-06-14 NL NL6708253A patent/NL6708253A/xx unknown
- 1967-06-14 BE BE699910D patent/BE699910A/xx unknown
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2000546A (en) * | 1931-04-18 | 1935-05-07 | John O Woodsome | Paper drying process and apparatus |
US2909847A (en) * | 1955-10-17 | 1959-10-27 | Beloit Iron Works | Dryer section arrangement for paper machines |
US2910784A (en) * | 1957-10-10 | 1959-11-03 | Midland Ross Corp | Drying equalizer arrangement |
US2977686A (en) * | 1959-02-19 | 1961-04-04 | Jamar Olmen Company | Apparatus for the manufacture of paper |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110132709A1 (en) * | 2008-08-21 | 2011-06-09 | Exedy Corporation | Torque converter |
Also Published As
Publication number | Publication date |
---|---|
GB1162877A (en) | 1969-08-27 |
FI45124B (fi) | 1971-11-30 |
BE699910A (fi) | 1967-11-16 |
NL6708253A (fi) | 1967-12-15 |
DE1561641A1 (de) | 1970-04-02 |
ES341742A1 (es) | 1968-07-01 |
AT288147B (de) | 1971-02-25 |
SE322408B (fi) | 1970-04-06 |
FI45124C (fi) | 1972-03-10 |
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