CA2185891A1 - Device for applying steam - Google Patents
Device for applying steamInfo
- Publication number
- CA2185891A1 CA2185891A1 CA002185891A CA2185891A CA2185891A1 CA 2185891 A1 CA2185891 A1 CA 2185891A1 CA 002185891 A CA002185891 A CA 002185891A CA 2185891 A CA2185891 A CA 2185891A CA 2185891 A1 CA2185891 A1 CA 2185891A1
- Authority
- CA
- Canada
- Prior art keywords
- steam
- blower box
- web
- steam blower
- paper
- 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.)
- Abandoned
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
- D21F11/14—Making cellulose wadding, filter or blotting paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/32—Washing wire-cloths or felts
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/02—Drying on cylinders
- D21F5/04—Drying on cylinders on two or more drying cylinders
- D21F5/042—Drying on cylinders on two or more drying cylinders in combination with suction or blowing devices
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F7/00—Other details of machines for making continuous webs of paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F9/00—Complete machines for making continuous webs of paper
- D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G7/00—Damping devices
Landscapes
- Paper (AREA)
Abstract
An apparatus for the application of steam onto a paper web has a steam blower box 48 with numerous zone chambers arranged side by side over the web width. The steam blower box 48 is dis-placeable so that the spacing between it and the web path is adjustable. A steam supply line 4 extends from each zone chamber in the longitudinal direction through the interior of the steam blower box, and from there outward to a support plate 28. There the clearance between adjacent steam lines is substantially greater than in the interior of the steam blower box. A steam control valve 35, that is connected via a flexible line 29 to the support plate 28, is provided for each zone chamber laterally outside the paper-making machine.
Description
2 1 85891 .~
Apparatus for the application of steam Specification The present invention relates to an apparatus for the application of steam onto a moving material web, for example onto a paper web that is to be dewatered and is passing through the press section of a paper-manufacturing machine. A steam blower box is a principal part of such an apparatus. Reference is made to German published application DE 41 25 062 A1.
A steam blower box of this kind is utilized primarily in paper manufacturing. Its purpose is, with the aid of the steam applied onto the material web, to raise the temperature of the material web in order to increase the dewateringperformance of the press section. The steam blower box offers the possibility of influen-cing the transverse moisture profile of the material web by sectionally varying steam application.
In the known design, steam emerging from the sectional chambers (or "zone chambers") is controlled by valves that are arranged inside the steam blower box. Each correction zone is fitted with a separate, generally pneumatically controlled valve.
Failure of a control valve means first of all that the cor-responding zone can no longer be corrected, which leads to an impairment of paper quality. Replacement of a defective valve requires an expensive production shutdown. A long time period, during which reject paper is occasionally produced (removal, . .
installation, and warmup time), is sometimes required before a stable operating state is then achieved again.
It is the object of the invention to provide an apparatus of the type described above that meets as many as possible of the requirements indicated below:
1. It should be possible to select as small a width as possible for the zone chambers, and to make the number of zone chambers correspondingly large (for a given steam blower box length).
2. The control valves should be easy to repair or replace with no need to shut down the machine temporarily for this purpose.
Apparatus for the application of steam Specification The present invention relates to an apparatus for the application of steam onto a moving material web, for example onto a paper web that is to be dewatered and is passing through the press section of a paper-manufacturing machine. A steam blower box is a principal part of such an apparatus. Reference is made to German published application DE 41 25 062 A1.
A steam blower box of this kind is utilized primarily in paper manufacturing. Its purpose is, with the aid of the steam applied onto the material web, to raise the temperature of the material web in order to increase the dewateringperformance of the press section. The steam blower box offers the possibility of influen-cing the transverse moisture profile of the material web by sectionally varying steam application.
In the known design, steam emerging from the sectional chambers (or "zone chambers") is controlled by valves that are arranged inside the steam blower box. Each correction zone is fitted with a separate, generally pneumatically controlled valve.
Failure of a control valve means first of all that the cor-responding zone can no longer be corrected, which leads to an impairment of paper quality. Replacement of a defective valve requires an expensive production shutdown. A long time period, during which reject paper is occasionally produced (removal, . .
installation, and warmup time), is sometimes required before a stable operating state is then achieved again.
It is the object of the invention to provide an apparatus of the type described above that meets as many as possible of the requirements indicated below:
1. It should be possible to select as small a width as possible for the zone chambers, and to make the number of zone chambers correspondingly large (for a given steam blower box length).
2. The control valves should be easy to repair or replace with no need to shut down the machine temporarily for this purpose.
3. The spacing between the steam blower box and the web passing by (which at that point is usually supported by a roll) should be adjustable. Under normal operating conditions the spacing should be relatively small, but relatively large during startup or for maintenance purposes.
The stated object is achieved by the features of Claim 1.
While in the prior art the predefined size of the control valves determines the smallest possible width of the zone chambers, according to the invention the zone chambers can have ~;mPn~ions as small as desired, since the control valves are always arranged outside the steam blowerbox, specifically alongside the machine.
This also provides the additional advantage that the control valves are accessible even while the machine is operating, so that if necessary one or the other control valve can be repaired or replaced without requiring a costly machine shutdown for the purpose.
It is true that with the design according to the invention, each zone cham~ber must be connected to one of the control valves by means of its own ("sectional") steam line. An additional complicating factor lies in the fact that because of the required displaceability of the steam blower box, a portion of each sectional steam line must be made movable. Each sectional steam line thus comprises a part mounted on the steam blower box (with an inflow end located outside the steam blower box), and a movable part that is connected on the one hand (directly or indirectly) to the relevant control valve and on the other hand can be coupled to the said inflow end by means of a line connection. In this context, an essential part of the idea of the invention consists in the fact that the clearance between adjacent inflow ends (of the line parts mounted on the steam blower box) is substantially greater than the clearance provided inside the steam blower box between adjacent sectional steam lines. In other words, the parts of the sectional steam line mounted on the steam blower box fan out, opposite to the flow direction, outside the steam blower box. Only in this manner is it possible, when the cross-sectional ~;m~n~ions of the steam blower box are relatively small, to provide an unusually large number of sectional steam lines (and thus a large num~ber of relatively narrow zone chambers), and still have enough room available at the inflow ends for the line connections of the movable line parts that are to be coupled.
According to a preferred embodiment of the invention, the following provisions are made:
21858~1 The steam is fed from a main steam line to a steam distributor that is arranged outside the paper-making machine, preferably alongside the paper-making machine, for example on the drive side or, for example, in the underfloor, but in any case at a point easily accessible during operation of the machine. The individual control elements (control valves) are arranged on this steam distributor. Each individual zone chamber of the steam blower box is connected to the corresponding control valve via a separate sectional steam line. The parts of the sectional steam lines mounted on the steam blower box end (opposite to the flow direction) outside the steam blower box on a plate, for example support plate, that is rigidly joined to the steam blower box. Flexible lines between the support plate and the control valves serve to accommodate swiveling movements and to compensate for any thermal elongation of the steam blower box. The valve drives are controlled by electric motors.
The invention will be described below with reference to a preferred exemplified embodiment, in conjunction with the following drawings, in which Fig. 1 is a general view;
Fig. 2 shows a cross section through a steam blower box;
Fig. 3 shows a zone chamber with perforated panel insert;
igs. 4/5 shows the connection between the flexible lines and the steam blower box lines: Fig. 4, detached; Fig.
5, attached;
Fig. 6 shows an example of installation in a press section;
- 21858~t -Figs. 7/8 shows an exemplified embodiment diverging from Figs.
2 and 3.
The steam blower box 48 consists of a self-supporting stainless steel structure; it extends, transverse to the web travel direction through the paper-making machine from guide side FS
to drive side TS (Fig. 8), along the outer surface of a roll which guides paper web P. Only the drive-side end of the steam blower box is shown in Fig. 1. Webs 43, which have orifices 10 and 11, are welding into lower support frames 1, 1'. Lower support frames 1, 1' and an upper support frame 2 are joined to one another via side walls 8 and 9. Optimum transverse stability is achieved with this construction. Support frames 1, 1', and 2 and side walls 8 and 9 delimit a central chamber 15. Through this extends a tube bundle consisting of a plurality of steam lines 4, each of which opens into a zone chamber 3 so as thereby to apply "steam I" onto paper web P as it passes by.
A steam conduit 13 opens into lower chamber 12. According to Fig. 1, the preheating steam ("steam II") flowing in here passes through orifices 10 and 14 into chamber 15 which encloses tube bundle 4. This steam II passes lastly through orifices 16 into chamber 33 of support frame 2. In a divergent exemplified embodiment, inflowing steam II is guided first through chamber 12 from drive side to guide side, and passes through orifices in connecting zone 45 into chamber 15 (Figs. 7 and 8). This steam II, whose temperature is greater than steam I inside sectional steam lines 4, ensures that even when the valves are closed, no cooling of the sectional steam lines 4 or the individual zone chambers 3 occurs. Among the results of this is that little or no co~ensation forms in the steam lines and in the zone chambers. Moreover a strict separation between steam I and steam II is ensured.
The individual zone chambers 3 are arranged on lower support frames 1, 1'. They are fastened by means of side panels 19 and 17. A separate steam line 4 opens into each zone chamber. Each zone chamber contains a perforated panel insert 20 with per-forated panels 34 whose open cross-sectional area increases toward the steam exit. The effect of these perforated panels 34 is to distribute steam I uniformly over the zone width within the individual zones. The individual perforated panel inserts 20 can be pulled out for maintenance purposes tFig. 3).
The individual zone chambers 3 are delimited by one (according to Fig. 1) common steam exit panel 22. This is bolted to panel parts 19 and 1, or fastened by means of guide bars 44, so it can easily be removed for cleaning purposes. It has multiple rows of blower openings 32, arranged behind one another in the longitudinal direction. The steam exit direction can be perpen-dicular to the paper travel direction or, according to Fig.
2, inclined so that steam I flows against the web as it arrives.
Runoff openings 11, 18, with associated dewatering troughs 24, 25, 26, 27, are provided wherever steam con~en~ation might occur.
According to Fig. 1 the drive-side end of steam blower box 48 rests, by means of a support plate 28 that can be an extension of, for example, lower support frame 1, 1', displaceably on a stand 51. Steam lines 4 are extended outward, opposite to the steam flow direction, beyond the drive-side end of the steam blower box; their inflow ends are, for example, immovably joined to support plate 28. A control element, designated overall as R, is arranged laterally outside the paper-making machine, and comprises for each zone chamber 3 a control valve 35 driven by a stepping motor M. The connection from control valves 35 to support plate 28 is provided by lines 29 that are configured at least partly as flexible lines. Outflow ends 29' of a number of the flexible lines are fastened to a "supply plate" 30. This supply plate is joined by means of quick clamping elements 31 to support plate 28. By means of these quick clamping elements, rapid decoupling is possible in the event of removal of the steam blower box (see Figs. 4 and 5). Control valves 35 are designed so that several of them can be combined next to one another on one steam distribution conduit 36. Steam is supplied to each steam distribution conduit 36 from a main steam line H.
The advantages of the construction of control element R as just described are:
1. The location outside the steam blower box allows a very large number of zone chambers 3, and convenient maintenance of valves 35 while the machine is running.
2. No restriction on steam temperature is necessary, since the control valves have no parts subject to wear, such as diaphragms (no steam cooling).
3. Extremely precise metering of steam volumes is possible due to the stepping-motor drive system.
The stated object is achieved by the features of Claim 1.
While in the prior art the predefined size of the control valves determines the smallest possible width of the zone chambers, according to the invention the zone chambers can have ~;mPn~ions as small as desired, since the control valves are always arranged outside the steam blowerbox, specifically alongside the machine.
This also provides the additional advantage that the control valves are accessible even while the machine is operating, so that if necessary one or the other control valve can be repaired or replaced without requiring a costly machine shutdown for the purpose.
It is true that with the design according to the invention, each zone cham~ber must be connected to one of the control valves by means of its own ("sectional") steam line. An additional complicating factor lies in the fact that because of the required displaceability of the steam blower box, a portion of each sectional steam line must be made movable. Each sectional steam line thus comprises a part mounted on the steam blower box (with an inflow end located outside the steam blower box), and a movable part that is connected on the one hand (directly or indirectly) to the relevant control valve and on the other hand can be coupled to the said inflow end by means of a line connection. In this context, an essential part of the idea of the invention consists in the fact that the clearance between adjacent inflow ends (of the line parts mounted on the steam blower box) is substantially greater than the clearance provided inside the steam blower box between adjacent sectional steam lines. In other words, the parts of the sectional steam line mounted on the steam blower box fan out, opposite to the flow direction, outside the steam blower box. Only in this manner is it possible, when the cross-sectional ~;m~n~ions of the steam blower box are relatively small, to provide an unusually large number of sectional steam lines (and thus a large num~ber of relatively narrow zone chambers), and still have enough room available at the inflow ends for the line connections of the movable line parts that are to be coupled.
According to a preferred embodiment of the invention, the following provisions are made:
21858~1 The steam is fed from a main steam line to a steam distributor that is arranged outside the paper-making machine, preferably alongside the paper-making machine, for example on the drive side or, for example, in the underfloor, but in any case at a point easily accessible during operation of the machine. The individual control elements (control valves) are arranged on this steam distributor. Each individual zone chamber of the steam blower box is connected to the corresponding control valve via a separate sectional steam line. The parts of the sectional steam lines mounted on the steam blower box end (opposite to the flow direction) outside the steam blower box on a plate, for example support plate, that is rigidly joined to the steam blower box. Flexible lines between the support plate and the control valves serve to accommodate swiveling movements and to compensate for any thermal elongation of the steam blower box. The valve drives are controlled by electric motors.
The invention will be described below with reference to a preferred exemplified embodiment, in conjunction with the following drawings, in which Fig. 1 is a general view;
Fig. 2 shows a cross section through a steam blower box;
Fig. 3 shows a zone chamber with perforated panel insert;
igs. 4/5 shows the connection between the flexible lines and the steam blower box lines: Fig. 4, detached; Fig.
5, attached;
Fig. 6 shows an example of installation in a press section;
- 21858~t -Figs. 7/8 shows an exemplified embodiment diverging from Figs.
2 and 3.
The steam blower box 48 consists of a self-supporting stainless steel structure; it extends, transverse to the web travel direction through the paper-making machine from guide side FS
to drive side TS (Fig. 8), along the outer surface of a roll which guides paper web P. Only the drive-side end of the steam blower box is shown in Fig. 1. Webs 43, which have orifices 10 and 11, are welding into lower support frames 1, 1'. Lower support frames 1, 1' and an upper support frame 2 are joined to one another via side walls 8 and 9. Optimum transverse stability is achieved with this construction. Support frames 1, 1', and 2 and side walls 8 and 9 delimit a central chamber 15. Through this extends a tube bundle consisting of a plurality of steam lines 4, each of which opens into a zone chamber 3 so as thereby to apply "steam I" onto paper web P as it passes by.
A steam conduit 13 opens into lower chamber 12. According to Fig. 1, the preheating steam ("steam II") flowing in here passes through orifices 10 and 14 into chamber 15 which encloses tube bundle 4. This steam II passes lastly through orifices 16 into chamber 33 of support frame 2. In a divergent exemplified embodiment, inflowing steam II is guided first through chamber 12 from drive side to guide side, and passes through orifices in connecting zone 45 into chamber 15 (Figs. 7 and 8). This steam II, whose temperature is greater than steam I inside sectional steam lines 4, ensures that even when the valves are closed, no cooling of the sectional steam lines 4 or the individual zone chambers 3 occurs. Among the results of this is that little or no co~ensation forms in the steam lines and in the zone chambers. Moreover a strict separation between steam I and steam II is ensured.
The individual zone chambers 3 are arranged on lower support frames 1, 1'. They are fastened by means of side panels 19 and 17. A separate steam line 4 opens into each zone chamber. Each zone chamber contains a perforated panel insert 20 with per-forated panels 34 whose open cross-sectional area increases toward the steam exit. The effect of these perforated panels 34 is to distribute steam I uniformly over the zone width within the individual zones. The individual perforated panel inserts 20 can be pulled out for maintenance purposes tFig. 3).
The individual zone chambers 3 are delimited by one (according to Fig. 1) common steam exit panel 22. This is bolted to panel parts 19 and 1, or fastened by means of guide bars 44, so it can easily be removed for cleaning purposes. It has multiple rows of blower openings 32, arranged behind one another in the longitudinal direction. The steam exit direction can be perpen-dicular to the paper travel direction or, according to Fig.
2, inclined so that steam I flows against the web as it arrives.
Runoff openings 11, 18, with associated dewatering troughs 24, 25, 26, 27, are provided wherever steam con~en~ation might occur.
According to Fig. 1 the drive-side end of steam blower box 48 rests, by means of a support plate 28 that can be an extension of, for example, lower support frame 1, 1', displaceably on a stand 51. Steam lines 4 are extended outward, opposite to the steam flow direction, beyond the drive-side end of the steam blower box; their inflow ends are, for example, immovably joined to support plate 28. A control element, designated overall as R, is arranged laterally outside the paper-making machine, and comprises for each zone chamber 3 a control valve 35 driven by a stepping motor M. The connection from control valves 35 to support plate 28 is provided by lines 29 that are configured at least partly as flexible lines. Outflow ends 29' of a number of the flexible lines are fastened to a "supply plate" 30. This supply plate is joined by means of quick clamping elements 31 to support plate 28. By means of these quick clamping elements, rapid decoupling is possible in the event of removal of the steam blower box (see Figs. 4 and 5). Control valves 35 are designed so that several of them can be combined next to one another on one steam distribution conduit 36. Steam is supplied to each steam distribution conduit 36 from a main steam line H.
The advantages of the construction of control element R as just described are:
1. The location outside the steam blower box allows a very large number of zone chambers 3, and convenient maintenance of valves 35 while the machine is running.
2. No restriction on steam temperature is necessary, since the control valves have no parts subject to wear, such as diaphragms (no steam cooling).
3. Extremely precise metering of steam volumes is possible due to the stepping-motor drive system.
4. Easy and cost-effective changeover from m~nll~l to automatic control is possible.
5. No compressed-air supply is required (eliminates the I/P
converter).
converter).
6. The valve position can be read directly.
A known method can be used to ensure that the steam volume emerging from the valve is almost independent of the resistance values downstream, i.e. this guarantees that despite differences -in the steam line lengths for the individual zones, approximately the same steam volume emerges from each zone for the same valve setting.
It is evident from the cross sections in Figs. 2 and 7 that inside steam blower box 48 and 48', respectively, sectional steam lines 4 are located above and next to one another so they almost touch (clearance a). The same steam lines fan out, however, outside the steam blower box, so that relatively large clearances b exist at their inflow ends 4'; b can be (as an example) 10 to 50 times greater than a (Fig. 4). The number of zone chambers 3 can thus be made very large (and their width B very small); at the same time all couplings 29' which connect flexible lines 29 to inflow ends 4' can be arranged in one and the same plane on support plate 28.
In extreme cases, the width of the individual zone chambers can be reduced to a ~;m~n~ion that is only slightly greater than the outside diameter of the individual steam line 4.
Fig. 6 schematically shows a press section in which a pre-pressing gap, through which the paper web being dewatered passes together with two felts, is constituted between two press rolls 45 and 46. After the pre-pressing gap the lower felt passes to a felt guide roll 49, while the paper web, together with the upper felt on press roll 46 (usually a suction press roll), passes upward into a pressing gap formed between rolls 46 and 47. Press roll 47 is feltless, i.e. it comes into direct contact with the paper web. One or two scrapers 50 are therefore provided for continuous cleaning of this roll. Steam blower box 48, already described above in detail, is arranged in the very tight space between rolls 49, 46, and 47 on the one hand, and scrapers 50 on the other hand. It is shown in the normal operating position, but it is horizontally displaceable so it can tempo-rarily be brought into a position away from roll 46.
A known method can be used to ensure that the steam volume emerging from the valve is almost independent of the resistance values downstream, i.e. this guarantees that despite differences -in the steam line lengths for the individual zones, approximately the same steam volume emerges from each zone for the same valve setting.
It is evident from the cross sections in Figs. 2 and 7 that inside steam blower box 48 and 48', respectively, sectional steam lines 4 are located above and next to one another so they almost touch (clearance a). The same steam lines fan out, however, outside the steam blower box, so that relatively large clearances b exist at their inflow ends 4'; b can be (as an example) 10 to 50 times greater than a (Fig. 4). The number of zone chambers 3 can thus be made very large (and their width B very small); at the same time all couplings 29' which connect flexible lines 29 to inflow ends 4' can be arranged in one and the same plane on support plate 28.
In extreme cases, the width of the individual zone chambers can be reduced to a ~;m~n~ion that is only slightly greater than the outside diameter of the individual steam line 4.
Fig. 6 schematically shows a press section in which a pre-pressing gap, through which the paper web being dewatered passes together with two felts, is constituted between two press rolls 45 and 46. After the pre-pressing gap the lower felt passes to a felt guide roll 49, while the paper web, together with the upper felt on press roll 46 (usually a suction press roll), passes upward into a pressing gap formed between rolls 46 and 47. Press roll 47 is feltless, i.e. it comes into direct contact with the paper web. One or two scrapers 50 are therefore provided for continuous cleaning of this roll. Steam blower box 48, already described above in detail, is arranged in the very tight space between rolls 49, 46, and 47 on the one hand, and scrapers 50 on the other hand. It is shown in the normal operating position, but it is horizontally displaceable so it can tempo-rarily be brought into a position away from roll 46.
Claims (10)
1. Apparatus for the application of steam ("steam I") onto a moving material web (P), for example onto a paper web that is to be dewatered and is passing through the press section of a paper-manufacturing machine, with the following features:
a) an elongated steam blower box (48) extends, transverse to the web travel direction, over the entire web width;
b) the steam blower box (48) has a plurality of zone chambers (3) arranged side by side over the web width;
c) each zone chamber (3) is connected, via its own sectional steam line (4, 29) with a control valve (35) provided therein, to a steam source (H);
characterized by the following further features:
d) the steam blower box (48) is mounted displaceably in such a way that the spacing between the steam blower box and the web path is adjustable;
e) each of the control valves (35) is arranged laterally at a distance from the steam blower box, for example laterally outside the paper-making machine, and connected by means of a movable part (29) of the sectional steam line to the inflow end (4') of a part (4) of the sectional steam line fastened to the steam blower box;
f) the regions of the sectional steam lines (4) located inside the steam blower box (48) are arranged so that the clearance (a) between adjacent lines (4), viewed in cross section through the steam blower box (Fig.
2 or 7), is only a fraction of the clearance (b) that is provided between adjacent inflow ends (4', Fig.
4 or 5) located outside the steam blower box.
a) an elongated steam blower box (48) extends, transverse to the web travel direction, over the entire web width;
b) the steam blower box (48) has a plurality of zone chambers (3) arranged side by side over the web width;
c) each zone chamber (3) is connected, via its own sectional steam line (4, 29) with a control valve (35) provided therein, to a steam source (H);
characterized by the following further features:
d) the steam blower box (48) is mounted displaceably in such a way that the spacing between the steam blower box and the web path is adjustable;
e) each of the control valves (35) is arranged laterally at a distance from the steam blower box, for example laterally outside the paper-making machine, and connected by means of a movable part (29) of the sectional steam line to the inflow end (4') of a part (4) of the sectional steam line fastened to the steam blower box;
f) the regions of the sectional steam lines (4) located inside the steam blower box (48) are arranged so that the clearance (a) between adjacent lines (4), viewed in cross section through the steam blower box (Fig.
2 or 7), is only a fraction of the clearance (b) that is provided between adjacent inflow ends (4', Fig.
4 or 5) located outside the steam blower box.
2. Apparatus according to claim 1, characterized in that in order to preheat or heat up the steam blower box (48), steam ("steam II") can be supplied to the steam blower box independently of the steam ("steam I") acting on the material web (P).
3. Apparatus according to one of claims 1 or 2, characterized in that a support plate (28) which extends in the region outside the longitudinal extension of the steam blower box (for example in the region laterally outside the paper-making machine) is provided at at least one of the two ends of the steam blower box (48); and wherein each of the inflow ends (4') of the part (4) of the sectional steam line fastened to the steam blower box is fastened to the support plate (28).
4. Apparatus according to claim 3, characterized in that at least one group of flexible lines (29) can be coupled by means of a supply plate (30) to the support plate (28).
5. Apparatus according to any of the foregoing claims, characterized in that each of the control valves (35) can be controlled by means of a stepping motor (M).
6. Apparatus according to any of the foregoing claims, characterized in that the width (B) of the individual zone chambers (3) is approximately equal to the diameter (D) of the steam line (4) opening into it.
7. Apparatus according to any of the foregoing claims, characterized in that a cavity (33), into which a support can be introduced transverse to the web travel direction, is provided in the upper region of the steam blower box cross section for purposes of removing the steam blower box from the paper-making machine (Fig. 2).
8. Utilization of an apparatus according to any of the foregoing claims, in a press section which comprises at least three press rolls (45-47) and has the following features:
a) the paper web runs together with a felt over the middle press roll (for example suction press roll 46) into a press nip, constituted by the suction press roll and a feltless press roll ("central roll" 47);
b) the steam blower box (48) applies steam to the paper web as it passes over the suction press roll (46), and is displaceable relative to the latter so that the spacing of the suction press roll is adjustable;
c) a scraper (50) is provided on a peripheral portion of the feltless press roll unoccupied by the web.
a) the paper web runs together with a felt over the middle press roll (for example suction press roll 46) into a press nip, constituted by the suction press roll and a feltless press roll ("central roll" 47);
b) the steam blower box (48) applies steam to the paper web as it passes over the suction press roll (46), and is displaceable relative to the latter so that the spacing of the suction press roll is adjustable;
c) a scraper (50) is provided on a peripheral portion of the feltless press roll unoccupied by the web.
9. Utilization of an apparatus according to claim 8, charac-terized in that two scrapers (50) are provided one behind the other on the feltless press roll (47).
10. Utilization of an apparatus according to claim 8 or 9, characterized in that before the said pressing nip the paper web passes, together with the felt and a second felt, through a pre-pressing nip; and wherein the second felt passes from the pre-pressing nip to a guide roll (49).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002185891A CA2185891A1 (en) | 1995-01-19 | 1995-01-19 | Device for applying steam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002185891A CA2185891A1 (en) | 1995-01-19 | 1995-01-19 | Device for applying steam |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2185891A1 true CA2185891A1 (en) | 1996-07-25 |
Family
ID=4158936
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002185891A Abandoned CA2185891A1 (en) | 1995-01-19 | 1995-01-19 | Device for applying steam |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2185891A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6412189B1 (en) | 1999-10-21 | 2002-07-02 | Metso Paper Automation Oy | Steam box of a paper machine |
| WO2009086638A1 (en) * | 2008-01-09 | 2009-07-16 | Honeywell Acsa Lnc | Drop-out steam profiling cartridge |
-
1995
- 1995-01-19 CA CA002185891A patent/CA2185891A1/en not_active Abandoned
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6412189B1 (en) | 1999-10-21 | 2002-07-02 | Metso Paper Automation Oy | Steam box of a paper machine |
| WO2009086638A1 (en) * | 2008-01-09 | 2009-07-16 | Honeywell Acsa Lnc | Drop-out steam profiling cartridge |
| US7871494B2 (en) | 2008-01-09 | 2011-01-18 | Honeywell Asca Inc. | Drop-out steam profiling cartridge |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |