CN116134192A - Machine and method for producing a fibrous web - Google Patents
Machine and method for producing a fibrous web Download PDFInfo
- Publication number
- CN116134192A CN116134192A CN202180059502.XA CN202180059502A CN116134192A CN 116134192 A CN116134192 A CN 116134192A CN 202180059502 A CN202180059502 A CN 202180059502A CN 116134192 A CN116134192 A CN 116134192A
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- transfer
- dryer
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- machine
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- 238000004519 manufacturing process Methods 0.000 title description 8
- 238000012546 transfer Methods 0.000 claims abstract description 162
- 238000000926 separation method Methods 0.000 claims abstract description 53
- 239000002699 waste material Substances 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 12
- 239000000123 paper Substances 0.000 claims abstract description 12
- 238000012545 processing Methods 0.000 claims abstract description 4
- 238000001035 drying Methods 0.000 claims description 35
- 238000005520 cutting process Methods 0.000 claims description 19
- 239000000835 fiber Substances 0.000 claims description 7
- 238000011144 upstream manufacturing Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000007664 blowing Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 239000010893 paper waste Substances 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
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Classifications
-
- 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
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G9/00—Other accessories for paper-making machines
- D21G9/0063—Devices for threading a web tail through a paper-making machine
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- Sanitary Thin Papers (AREA)
Abstract
The invention relates to a machine for producing or treating a fibrous web (4), in particular a paper, cardboard or tissue web, having a dryer section (1) which comprises at least two successive double-row dryer groups (2, 3) with a plurality of dryer cylinders (2.1, 2.2, 2.3, 3.1, 3.2), and having a needle cutter for forming a transfer strip (4.1), wherein a separation position (5) is provided between the at least two double-row dryer groups (2, 3) and a transfer device (6) is provided for transferring the transfer strip (4.1) from the end of the first double-row dryer group (2) into the second double-row dryer group (3), characterized in that at least the transfer strip (4.1) is guided into a waste discharge device (12) arranged below the separation position (5), and the transfer device (6) comprises a guide element (7.7) having a substantially vertical extension, and in that the transfer device (6) is pivotable about the transfer element (7) from the separation position (7.7) into the pivot position (7) in the pivot position (7) around the pivot position (7.7), so that the transfer belt (4.1) is transferred into the second double-row dryer group (3). The invention also relates to a method of guiding a fibrous web in a machine for producing or processing a fibrous web.
Description
The invention relates to a machine for producing or treating a fibrous web, in particular a paper, cardboard or tissue web, having a dryer section which comprises at least two successive double-row dryer groups with a plurality of dryer cylinders and having a needle cutter for forming a transfer strand, wherein a separation point is provided between the at least two double-row dryer groups and a transfer device is provided for transferring the transfer strand from the end of a first double-row dryer group into a second double-row dryer group.
The invention also relates to a transfer device and a method for transferring.
Devices of this type are known. Document DE 1020110289508 A1 describes a dryer section of a machine for producing or processing a fibrous web. The dryer section has two double-row dryer groups with separation locations formed between them for separating the web run and transfer, and a transfer system for transferring strips of the fibrous web. The transfer system comprises a rope arrangement for transferring the transfer tape. The transfer strip is led laterally out of the dryer section and guided into so-called rope shears of a rope arrangement and further guided by the rope into the next machine group.
The known device has a number of disadvantages. The rope must often be checked for wear and thus also presents a risk to the operator in case of rope breakage. The known solutions are also very expensive to purchase and to operate and to maintain due to the large number of necessary components, such as ropes, rope tensioners, pulleys, etc. Furthermore, the known solutions provide only insufficient reliability in the transport of the strip, especially at higher machine speeds and high weight per unit area of the fibrous web.
The object of the present invention is therefore to provide a machine with a drying section and a transfer device and a method for transferring, which do not have the disadvantages of the known solutions and are a reliable and economical solution.
The problem is solved by the features of claim 1. A machine for producing or treating a fibrous web, in particular a paper, cardboard or tissue web, has a dryer section which comprises at least two successive double-row dryer groups with a plurality of dryer cylinders and a needle cutter for forming a transfer strand, wherein a separation point is provided between the at least two double-row dryer groups and a transfer device is provided for transferring the transfer strand from the end of the first double-row dryer group into the second double-row dryer group. According to the invention, at least the transfer strip is guided into a waste discharge device arranged below the separation position, and the transfer device comprises a guide element having a substantially vertically extending longitudinal direction, and the transfer device is pivotably arranged about a pivot axis in the region of the separation position above the waste discharge device, so that the transfer strip is transferred into the second double-row dryer group by pivoting the guide element from a rest position into a transfer position.
Furthermore, the invention can also be applied to a dryer section comprising at least 2 dryer groups, wherein the first dryer group is designed as a single row and the second dryer group is designed as a double row.
The technical problem is also solved by a transfer device according to claim 13. A transfer device for a dryer section of a machine for producing or treating a fibrous web, in particular a paper, cardboard or tissue web, having an upper dryer cylinder and a lower dryer cylinder and having a needle cutter for forming a transfer strip, wherein a separation point is formed between the upper dryer cylinder and the lower dryer cylinder, and wherein a transfer device is provided for transferring the transfer strip from the upper dryer cylinder to the lower dryer cylinder. According to the invention, at least the transfer strip is guided into a waste discharge device arranged below the separation position, and the transfer device comprises a guide element having a substantially vertically extending longitudinal direction, and the transfer device is pivotably arranged about a pivot axis in the region of the separation position above the waste discharge device, so that the transfer strip is pivoted from a rest position into a transfer position by the guide element, so that the transfer strip is transferred to the drying cylinder below.
The pivot shaft is preferably arranged adjacent below a blade bar of a doctor blade assigned to an upper drying cylinder.
In some cases, the guide element may be designed as a circumferential belt or a vacuum belt.
The pin cutter for forming and widening the transfer strip can be arranged in the first of the two double-row dryer groups or, seen in the machine direction, further upstream of the production process, for example at the beginning of the dryer section or press section or forming section of the machine. If a plurality of separation positions are provided in the dryer section, it is thereby possible to achieve guiding of the transport strip through the plurality of separation positions without having to provide a needle cutter for each separation position.
During the pivoting about the pivot axis of the guide device, starting from the rest position and ending in the transfer position, the pivot axis is preferably oriented horizontally and transversely to the machine running direction. The transfer strip is thus not spread laterally and its travel path substantially coincides with the travel path of the fibrous web in normal operation.
This is advantageous in particular for machine speeds of more than 800m/min (meters/min), in particular more than 1000m/min, preferably more than 1200 m/min.
Also, the invention enables a higher weight per unit area of the fibrous web, exceeding 130g/m 2 (g/square meter), in particular more than 160g/m 2 And preferably exceeds 200g/m 2 Or even over 250g/m 2 Reliable web guiding and fibrous web transfer under the circumstances of (a).
The invention is particularly advantageous for the production of, for example, folded cardboard or gypsum board and for cardboard types which are at least partly made of waste paper and thus have a lower breaking strength. Thus, a gentle transfer of the transport strip has a beneficial effect.
Furthermore, the invention is also effective for papers with very high breaking strength, such as virgin fibre board. At the beginning of the transfer process, the transfer strip can be cut open particularly reliably by moving the guide element from the rest position to the transfer position, so as to form the beginning of the transfer strip.
In practice, the transfer strip is transferred between the clothing of the second double-row dryer group, which is guided around the first guide roller, preferably the lower clothing of the second dryer group, and the outer jacket surface of the first dryer cylinder of the second double-row dryer group.
The guide element may comprise a main region and an end region in the longitudinal direction, wherein the end region passes over the first guide roller at a distance from the first guide roller when pivoted into the transfer position.
The end region may have a cutting edge, in particular a serrated cutting edge, for cutting the transfer strip. In this way, even if the strength and the weight per unit area of the fibrous web are high, the transfer strip can be cut particularly reliably by moving the guide element from the rest position to the transfer position at the beginning of the transfer process to form the beginning (also called the tail) of the transfer strip.
In a further possible embodiment, the main region and the end region may not be connected, but rather separated. In this case, the guiding element comprises a main region without an end region. The end region is formed by an end element which can be pivoted and moved in translation independently of the guide element. This enables separate guidance of the transfer strip and cutting for forming the beginning of the transfer strip and thus optimization of these subfunctions.
Preferably, the guide element extends substantially from the doctor bar carrying the doctor blade up to the first guide roller of the second double row dryer group.
The distance is preferably in the range from 20mm to 400mm, in particular from 50mm to 300mm, preferably from 100mm to 150 mm. This ensures a reliable transfer.
In an advantageous development, the end region of the guide element is rigidly or pivotably connected to the main region. In some cases, the pivotable connection may be advantageous to adapt the web travel path to the geometry of the beginning of the second dryer group. The pivotable design has the advantage that in the event of a break, the web runs undisturbed into the waste discharge device 12 and is reliably transferred.
The end regions may also be arranged at an angle relative to the main region.
It is furthermore possible that the main area is connected to the pivot axis and that a blowing nozzle is provided in order to generate an air flow between the guide element and the fiber web in the direction of the main area towards the end area of the guide element, i.e. in the longitudinal direction of the guide element. The transfer of the transfer strip is thereby supported.
In a possible practical embodiment, the mouthpiece is designed with a diameter in the range of 0.5mm to 5mm, preferably between 1.5mm to 2mm and compressed air in the range of up to 12bar is applied in order to generate an air flow with a speed equal to or greater than the speed of the fibrous web or the transport strip.
The air flow may be stable, constant or pulsating.
For stabilization by the flow force, the guide element, in particular the main region in the direction of the end region of the guide element, can also be designed to be flat or convex or concave towards the transport strip.
It is furthermore advantageous if the longitudinal direction of the guide element in the rest position has an angle of more than-5 °, preferably more than-10 °, in particular more than-15 °, relative to the vertical. The position of the guide element is thus slightly pivoted against the machine running direction. This ensures that the removal point of the fibrous web or transfer strip from the doctor blade from the last drying cylinder of the first double-row dryer group up to the free space of the waste discharge device, in order to guide the fibrous web or transfer strip unhindered into the waste discharge device.
The longitudinal direction of the guide element in the transport position has an angle of more than 10 °, preferably 15 °, relative to the vertical. This promotes gentle deflection and transfer of the transfer ribbon.
Furthermore, the guide element, in particular the main region, can have a distance in the range of 50mm to 400mm, in particular 50mm to 200mm, in the transfer position relative to the first dryer cylinder of the second double-row dryer group. This improves reliable transfer.
Advantageously, the end region of the guide element has a distance of between 20mm and 400mm, in particular between 20mm and 200mm, in the transfer position relative to the first dryer cylinder of the second double-row dryer group. This smaller distance improves the reliable reception of the transfer belt by the lower clothing of the second double-row dryer group and the outer cover of the first dryer cylinder of the second double-row dryer group.
Preferably, the first guide roller is arranged below the first drying drum of the second double-row dryer group such that the first guide roller does not intersect the vertical tangent of the first drying drum of the second double-row dryer group and is preferably offset in the machine running direction by a distance in the range of 0mm to 300 mm. The first guide roller is located in the shadow of the first dryer cylinder as seen from above. In this way, the fibrous web or the transfer strip is guided unimpeded into the waste discharge device. Accumulation is avoided.
Advantageously, a cutting knife, preferably having a machine width, is provided for cutting the fibrous web during operation of the machine. In machine operation, a targeted slitting of the fiber web may be necessary in the presence of downstream disturbances of the production. The complete transfer of the fibrous web (Auff hren) can thus be dispensed with. In this case, the transfer device therefore comprises a cutting knife.
In a possible embodiment, the cutting blade for cutting can be moved in the direction of the fiber web, preferably pulsed, with a pulse time of 0.01s to 2s, in particular 0.2s to 0.7 s. By means of the pulsed ejection and re-retraction of the cutter, operational faults caused by paper jams can be avoided.
The cutting blade for cutting may be moved obliquely downwards in the direction of the fibrous web at a movement angle of-45 ° to +45°, preferably 5 ° to 30 °, relative to the imaginary horizontal line.
In order to improve the waste discharge, a blowing pipe having a machine width is provided in the region of the cutting blade for supporting the discharge of the fibrous web into the waste discharge device.
The problem is also solved by a method for transferring a fibrous web in a machine for producing or treating a fibrous web, in particular a paper, board or tissue web, between at least two double-row dryer groups of a dryer section, which double-row dryer groups have a plurality of dryer cylinders. Wherein a separation point is provided between at least two double-row dryer groups, and wherein a transfer strip is separated from the fibrous web by a needle cutter and transferred from the end of a first double-row dryer group into a second double-row dryer group by a transfer device arranged in the region of the separation point. The invention is characterized in that at least the transfer strip is guided into a waste discharge device arranged below the separation position and the transfer device comprises a guide element having a substantially vertically extending longitudinal direction and the transfer device is arranged in the region of the separation position above the waste discharge device and the guide element is pivoted about a pivot axis from a rest position into a transfer position, whereby the transfer strip is transferred into the second double-drain dryer group.
The technical problem is also solved by a method according to claim 17.
In practice, the transfer strip may be formed after the machine has been restarted.
It is also conceivable that during the operation of the machine the fibrous web is cut in the machine width and subsequently forms a transfer strip.
The dryer section of the machine can be designed with a plurality of separation positions between every two double row dryer groups, and each separation position has the transfer device, and the guide elements of these transfer devices are all pivoted simultaneously or successively into the transfer position before the transfer, and wherein the needle cutter is arranged upstream of a first separation position of the plurality of separation positions in the machine running direction. The transfer tape produced by the needle cutter is transferred through a plurality of separation positions. This is an economically advantageous solution.
It is therefore advantageous if the transport strip is guided through at least two separation points and subsequently widened.
It is also conceivable that the machine is designed with a plurality of separation positions between every two double row dryer groups, and that each separation position has the transfer device, and that the guide elements of these transfer devices are pivoted into the transfer position all simultaneously or successively before the transfer, and that the needle cutters are arranged upstream of each of the plurality of separation positions (5) in the machine running direction.
In a possible alternative step, the transfer strip is widened after each separating position, in particular by means of a needle cutter which is movable transversely to the paper grain direction.
The invention also expressly extends to embodiments where no combination of features is specifically mentioned in the claims, whereby the features disclosed in the invention may be combined with each other in any way, as long as this is technically useful.
Other features and advantages of the present invention will be apparent from the following description of the preferred embodiments, which refers to the accompanying drawings.
In the accompanying drawings
Fig. 1 shows a simplified schematic diagram of an embodiment of a machine according to the invention in an operating state;
FIG. 2 shows a simplified schematic diagram of an embodiment of the machine according to the invention according to FIG. 1 in case of a break in operation;
FIG. 3 shows a simplified schematic diagram of an embodiment of the machine according to the invention according to FIG. 1 during transfer;
fig. 4 shows a simplified schematic diagram of an embodiment of the machine according to the invention according to fig. 3 with a single row of first dryer groups during transfer;
fig. 1 shows a simplified schematic illustration of an embodiment of a machine according to the invention for producing or treating a fibrous web 4 in a normal operating state. The machine is suitable for production and transfer with a machine speed of more than 800m/min with a speed of more than 130g/m 2 A fibrous web 4, in particular a fibrous web made at least partially of waste paper. Here, a part of the dryer section 1 is shown with two consecutive double- row dryer groups 2, 3 with dryer cylinders 2.1, 2.2, 2.3, 3.1, 3.2. The machine also has at least one needle cutter, not shown, for forming the transfer strip 4.1. A separation location 5 is formed between at least two double row dryer groups 2, 3. In the separation position 5, a transfer device 6 is provided for transferring the transfer strip 4.1 from the end of the first double row dryer group 2 into the second double row dryer group 3. Below the separation position 5 a waste discharge device 12 is arranged. Depending on the operating conditions, the fibrous web 4, the transfer belt 4.1 or the residual web 4.2 is guided into a waste discharge device 12. The transfer device 6 comprises a guide element 7 having a longitudinal direction 7.7 extending substantially vertically. The guide element is pivotably arranged about a pivot axis 7.3 in the region of the separation position 5 above the waste discharge device 12. The last dryer cylinder 2.3 of the first double row dryer group 2 is assigned a doctor blade 14, which has a doctor blade and a doctor blade bar. The pivot axis 7.3 is located below the doctor blade 14 and in the vicinity of the doctor blade. The guide element 7 extends downwards from the pivot shaft 7.3 up to the first guide roller 3.3 of the second double-row dryer group 3. A very long guide path is thereby formed at the edge of the separation point 5 for the fiber web 4 and the transfer strip 4.1, so that a reliable transfer is ensured. The guide element 7 comprises a main region 7.1 and an end region 7.2 connected to the main region 7.1. The main area 7.1 is connected upwards to the pivot axis 7.3. The width of the guide element 7 is in the range of 100mm to 500mm, preferably 200mm to 300mm and thus corresponds to the possible width of the transport strip 4.1The degree ranges correspond. The end region of the guide element 7 can be connected rigidly or pivotably to the main region 7.1. In some cases, the pivotable connection may be advantageous for adapting the web travel path of the transfer strip to the geometry of the beginning of the second dryer group 3. In the case of a pivotable end region 7.2, this end region can be connected to an electric, hydraulic or pneumatic actuator. The pivotable design has the advantage that in the event of a break, the web runs undisturbed into the waste discharge device 12 and is reliably transferred. In fig. 1, the normal operation of the production of a fibrous web 4 is shown. The fibrous web 4 is guided in a meandering manner in the machine width around the upper and lower dryer cylinders 2.1, 2.2, 2.3, 3.1, 3.2 together with the respective dryer wires 2.5, 2.6, 3.5. Between the upper and lower drying wires, the fibrous web 4 is unsupported and guided in a freely pulled manner. The guide element 6 is located in the rest position 7.5 and is pivoted in the longitudinal direction relative to the vertical line 10 against the machine running direction 13 by an angle WR exceeding-5 °. This ensures that in the event of a web break, no residues of the fibrous web 4 accumulate on the guide elements 6. The first drying cylinder 3.1 of the second dryer group 3 forms an entry gap with the clothing 3.6 guided around the first guide roller 3.3, into which entry gap the transfer belt 4.1 is guided by the guide element 7 during transfer. The first guide roller 3.3 is arranged below the first drying cylinder 3.1 of the second dryer group 3. The first guide roller 3.3 is here offset to such an extent in the machine direction 13 that the jacket of the first guide roller 3.3 does not intersect the perpendicular tangent on the first dryer cylinder 3.1. In fig. 1, the first guide roller is offset by a distance AVS in the range up to 300 mm. The first guide roller 3.3 is located in the shadow of the first dryer cylinder 3.1, seen from above. In this way, the fibrous web 4 or the transfer strip 4.1 is guided unimpeded into the waste discharge device 12. Accumulation is avoided. Thus, in combination with the rest position 7.5 of the guide element 6, the free space in the area of the separation position is free from obstructions. This facilitates the web to be guided undisturbed into the waste discharge device 12. Above the first dryer cylinder 3.1 of the second dryer group 3, a cutting knife 8 having a machine width is arranged for slitting the fibrous web 4. The cutting knives 8 may be arranged in phase in the direction of the fibrous web 4The movement angle BW of more than 5 ° measured for an imaginary horizontal line moves obliquely downward. The time pulses for the forward and backward movement of the cutting blade are designed to be very fast in order to avoid clogging points. The pulse time is in the range of 0.01s to 2 s. In order to improve the waste discharge, a blowing pipe 11 having a machine width is arranged in the region of the cutting blade 8 for supporting the discharge of the fiber web 4 into the waste discharge device.
The dryer section 1 in fig. 1, 2 and 3 corresponds to each other. But shows different operating conditions. For clarity, some reference numerals are not shown in all figures. Accordingly, reference numerals of elements conforming to each other may be reversed between those figures.
Fig. 2 shows an embodiment of the machine according to fig. 1 for producing or treating a fibrous web 4 in the operating state after slitting or during start-up of the machine. In the operating state after being cut by the cutting blade 8, the fibrous web 4 is guided undisturbed into the waste discharge device 12, and in the case that the transfer strip 4.1 has been formed upstream by the needle cutter, the transfer strip 4.1 and the residual web 4.2 are also guided undisturbed into the waste discharge device, because the guide element 7 is in the rest position. When the machine is restarted, the web led to the waste discharge device 12 can be the fibrous web 4 or the transfer strip 4.1 or the residual web 4.3 or the transfer strip 4.1 and the residual web 4.3. Depending on whether the transport strip has been cut and transferred by the needle cutter or cut, transferred and widened in the preceding respective separation position 5.
Fig. 3 shows the situation during the transfer. The guide element 7 has been brought by the actuator 7.4 from the rest position 7.5 into the transfer position 7.6 and in the process the transfer strip 4.1 is cut open in such a way that it forms the start of the transfer strip and is transferred into the entry gap between the lower clothing of the second double-row dryer group 3, which is guided around the first guide roller, and the outer mantle surface of the first dryer cylinder 3.1 of the second dryer group. Through this entry gap, the transfer strip 4.1 is gripped firmly and transferred. The pivot axis 7.3 is oriented horizontally and transversely to the machine running direction 13. The transfer belt 4.1 is thus not laterally deviated and its travel path substantially coincides with the travel path of the fibrous web 4 in the normal production run of the machine. During the pivoting of the guide element 7, the end region passes the first guide roller 3.3 at a distance AEL in the range between 20mm and 400mm when pivoting into the transport position. The longitudinal direction 7.7 of the main region 7.1 of the guide element 7 has an angle WU of more than 10 ° relative to the vertical in the transport position. This promotes gentle deflection and transfer of the transfer strip 4.1. Furthermore, in the transfer position 7.6, the guide element 7, in particular the main area 7.1, has a distance ALZ of 50mm to 400mm relative to the first dryer cylinder 3.1 of the second double-row dryer group 3. The main region 7.1 is connected to the pivot axis 7.3 and is provided with a mouthpiece for generating an air flow between the guide element 7 and the transfer strip 4.1 in the direction of the main region 7.1 towards the end region 7.2, i.e. in the longitudinal direction 7.7 of the guide element 7.
Fig. 4 shows in a simplified schematic illustration the embodiment of the machine according to the invention according to fig. 3 during transfer. The design of the dryer section 1 differs from the dryer section 1 shown in fig. 1 to 3 in that the first dryer group 2' is designed as a so-called single-row dryer group. The dryer cylinders 2.3 are arranged in a row and the fibrous web 4 is guided in a meandering manner and alternately between the dryer cylinders 2.3 together with the dryer wire 2.7 in a dryer wire suction roll 2″ arranged in a row below the dryer cylinders. In order to stabilize the web run, a web stabilizer 15 is arranged above the drying wire suction roll 2 ". On the last dryer cylinder 2.3, the dryer wire 2.7 is led away and the fibrous web 4 follows the last dryer cylinder 2.3 of the first dryer group 2'. Subsequently, the fibrous web 4 is removed from the last dryer cylinder 2.3 of the first dryer group 2' by the dryer wire 3.5 above the second dryer group 3, guided around the dryer wire suction roll 2″ and guided to the first dryer cylinder 3.1 above the second double-row dryer group 3. The operating conditions occurring in the modified dryer section 1 correspond to the conditions described in relation to fig. 1 to 3. Likewise, the elements involved in guiding and transferring the fibrous web 4 and the transfer strip 4.1 as well as the residual web 4.2 correspond to the elements already shown and described in fig. 1 to 3.
List of reference numerals
1. Drying section
2. First double-row dryer group
2' first single-row dryer group
2' drying net suction roll
2.1 Drying cylinder
2.2 Drying cylinder
2.3 Final drying drum
2.4 Guide roller
2.5 Upper drying net
2.6 Drying net below
2.7' drying wire
3. Second double-row dryer unit
3.1 First drying cylinder
3.2 Drying cylinder
3.3 First guide roller
3.4 Guide roller
3.5 Upper drying net
3.6 drying wire and clothing below
4. Fibrous web
4.1 Transfer strip
4.2 Residual breadth
5. Separation position
6. Transfer device
7. Guide element
7.1 Main area
7.2 End region
7.3 Pivot shaft
7.4 Actuator
7.5 Rest position
7.6 Transfer position
7.7 Longitudinal direction
8. Cutting knife
9. Horizontal line
10. Vertical line
11. Blowpipe
12. Waste material discharging device
13. Machine direction of operation
14. Scraper knife
15. Web stabilizer
AVS guide roller offset
Distance of AEL end region relative to first guide roller
Distance of AEZ end zone relative to first dryer cylinder
ALZ distance of guide element relative to first drying cylinder
Angle of WR rest position
Angle of WU transfer position
BW movement angle
Claims (17)
1. A machine for producing or treating a fibrous web (4), in particular a paper, cardboard or tissue web, with a dryer section (1) comprising at least two successive double-row dryer groups (2, 3) with a plurality of dryer cylinders (2.1, 2.2, 2.3, 3.1, 3.2), and with a needle cutter for forming a transfer strip (4.1), wherein a separation position (5) is designed between the at least two double-row dryer groups (2, 3) and a transfer device (6) is provided for transferring the transfer strip (4.1) from the end of a first double-row dryer group (2) into a second double-row dryer group (3), characterized in that at least the transfer strip (4.1) is guided into a waste discharge device (12) arranged below the separation position (5), and that the machine (6) comprises a guide element (7) with a substantially vertically extending longitudinal transfer strip (7.7) and that the transfer device (6) is pivotable about the transfer element (7.7) from the pivot position (7) into the separation position (7.7) in a pivotable position (7) around the pivot position (7), so that the transfer belt (4.1) is transferred into the second double-row dryer group (3).
2. The machine according to claim 1, characterized in that the transfer belt (4.1) is transferred between a clothing (3.6) of the second double-row dryer group (3) guided around the first guide roller (3.3) and the mantle surface of the first dryer cylinder (3.1) of the second double-row dryer group (3).
3. The machine according to claim 2, characterized in that the guide element (7) comprises a main region (7.1) and an end region (7.2) in the longitudinal direction (7.7), wherein the end region (7.2) passes the first guide roller (3.3) with a distance (AEL) from the first guide roller when pivoting into the transfer position (7.6).
4. A machine according to claim 3, characterized in that the pitch (AEL) is in the range between 20mm and 400mm, in particular between 50mm and 300mm, preferably between 100mm and 150 mm.
5. The machine according to any one of the preceding claims, characterized in that the end region (7.2) of the guide element (7) is rigidly or pivotably connected with the main region (7.1).
6. A machine according to any one of claims 3-5, characterized in that the main area (7.1) is connected to the pivot shaft (7.3) and that a mouthpiece is provided in order to create an air flow between the guide element and the transfer strip in the direction of the main area (7.1) towards the end area (7.2) of the guide element (7).
7. The machine according to any of the foregoing claims, characterized in that the longitudinal direction (7.7) of the guide element (7) has an angle (WR) of more than-5 °, preferably more than-10 °, in particular more than-15 °, relative to the vertical (10) in the rest position (7.5).
8. The machine according to any of the foregoing claims, characterised in that the longitudinal direction (7.7) of the guide element (7) in the transfer position (7.6) has an angle (WU) of more than 10 °, preferably 15 °, with respect to the vertical (10).
9. The machine according to any one of the preceding claims, wherein the guide element (7), in particular the main area (7.1), has a spacing (ALZ) in the range of 50mm to 400mm, in particular 50mm to 200mm, in the transfer position (7.6) relative to the first drying cylinder (3.1) of the second double-row dryer group (3).
10. The machine according to any of the foregoing claims, characterized in that the end region (7.2) of the guide element (7) has a spacing (AEZ) of between 20mm and 400mm, in particular 20mm and 200mm, in the transfer position (7.6) relative to the first drying cylinder of the second double-row dryer group (3).
11. The machine according to claim 2, characterized in that the first guide roller (3.3) is arranged below the first drying cylinder (3.1) of the second double-row dryer group (3) such that it does not intersect the vertical tangent of the first drying cylinder (3.1) of the second double-row dryer group (3) and is preferably offset by a distance (AVS) in the range of 0mm to 300mm in the machine running direction (13).
12. The machine according to any of the foregoing claims, characterised in that a cutting blade (8), preferably having a machine width, is provided for slitting the fibre web (4) during operation of the machine.
13. A transfer device for a dryer section (1) of a machine for producing or processing a fibrous web (4), in particular a paper, cardboard or tissue web, having an upper dryer cylinder (2.3) and a lower dryer cylinder (3.1) and having a needle cutter for forming a transfer strip (4.1), wherein a separation position (5) is formed between the upper dryer cylinder (2.3) and the lower dryer cylinder (3.1), and wherein a transfer device (6) is provided for transferring the transfer strip (4.1) from the upper dryer cylinder (2.3) to the lower dryer cylinder (3.1), characterized in that at least the transfer strip (4.1) is guided into a waste discharge device (12) arranged below the separation position (5), and the transfer device (6) comprises a guide element (7) having a longitudinal direction (7.7) extending substantially vertically, and the transfer device (6) is pivotable from the upper dryer cylinder (2.3) to the transfer position (7.1) via a pivot point (7) arranged in the pivot point (7) around the separation position (7.7).
14. Method for transferring a fibrous web (4) between at least two double-row dryer groups (2, 3) of a dryer section (1) in a machine for producing or treating fibrous webs, in particular paper, cardboard or tissue webs, which double-row dryer groups have a plurality of dryer cylinders (2.1, 2.2, 2.3, 3.1, 3.2), wherein a separation position (5) is designed between the at least two double-row dryer groups (2, 3), and wherein a transfer strip (4.1) is separated from the fibrous web (4) by means of a needle knife, and the transfer strip (4.1) is transferred from the end of a first double-row dryer group (2) into a second double-row dryer group (3) by means of a transfer device (6) arranged in the region of the separation position (5), characterized in that at least the transfer strip (4.1) is guided into a waste discharge device (12) arranged below the separation position (5), and in that the transfer device (6) comprises a pivoting device (7) having a substantially vertical extension (7) arranged in the region (7.7) around the pivot position (7) and in the pivot (7.7) in the region (7.7) which the transfer device (7.7) is arranged around the pivot position (7.7), whereby the transfer belt (4.1) is transferred into the second double-row dryer group (3).
15. Method according to claim 14, characterized in that the machine is designed with a plurality of separation locations (5) between every two double row dryer groups, and that each separation location (5) has the transfer device (6), and that the guiding elements (7) of these transfer devices (6) are pivoted into the transfer locations (7.6) all simultaneously or successively before transfer, and that the needle cutters are arranged upstream of the first separation location of the plurality of separation locations (5) in the machine running direction.
16. Method according to claim 15, characterized in that the transport strip (4.1) is guided through at least two separation locations (5) and subsequently widened.
17. Method for transferring a fibrous web (4) between an upper drying cylinder (2.3) and a lower drying cylinder (3.1) in a machine for producing or processing a fibrous web, in particular a paper, cardboard or tissue web, and wherein a separation location (5) is designed between the upper drying cylinder (2.3) and the lower drying cylinder (3.1), and wherein a transfer strip (4.1) is separated from the fibrous web (4) by means of a needle knife, and wherein a transfer device (6) is provided for transferring the transfer strip (4.1) from the upper drying cylinder (2.3) to the lower drying cylinder (3.1), characterized in that at least the transfer strip (4.1) is guided into a waste discharge device (12) arranged below the separation location (5), and that the transfer device (6) comprises a guide element (7) with a substantially vertically extending longitudinal direction (7.7), the guide element (7) being pivotably arranged around the transfer element (7.1) from the upper drying cylinder (2.3) into the lower drying cylinder (3.1) through the separation location (7.7) such that the transfer strip (7.1) is pivotably arranged in the separation location (5).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102020119892.2 | 2020-07-28 | ||
| DE102020119892.2A DE102020119892A1 (en) | 2020-07-28 | 2020-07-28 | Machine and method for manufacturing a fibrous web |
| PCT/EP2021/069285 WO2022023003A1 (en) | 2020-07-28 | 2021-07-12 | Machine and method for producing a fibrous material web |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116134192A true CN116134192A (en) | 2023-05-16 |
Family
ID=77042919
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202180059502.XA Pending CN116134192A (en) | 2020-07-28 | 2021-07-12 | Machine and method for producing a fibrous web |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4189158A1 (en) |
| CN (1) | CN116134192A (en) |
| DE (1) | DE102020119892A1 (en) |
| WO (1) | WO2022023003A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102023102861A1 (en) | 2023-02-07 | 2024-08-08 | Voith Patent Gmbh | Paper machine for producing a fibrous web and method for producing a fibrous web |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4416585C2 (en) | 1994-05-11 | 1999-09-02 | Voith Gmbh J M | Drying section of a paper machine |
| DE20011943U1 (en) | 2000-07-10 | 2000-09-28 | Voith Sulzer Papiertechnik Patent GmbH, 89522 Heidenheim | Device for transferring a flexible material web |
| DE102011089508A1 (en) | 2011-12-22 | 2013-06-27 | Voith Patent Gmbh | drying section |
-
2020
- 2020-07-28 DE DE102020119892.2A patent/DE102020119892A1/en not_active Withdrawn
-
2021
- 2021-07-12 EP EP21745707.6A patent/EP4189158A1/en active Pending
- 2021-07-12 CN CN202180059502.XA patent/CN116134192A/en active Pending
- 2021-07-12 WO PCT/EP2021/069285 patent/WO2022023003A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| WO2022023003A1 (en) | 2022-02-03 |
| DE102020119892A1 (en) | 2022-02-03 |
| EP4189158A1 (en) | 2023-06-07 |
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