EP1279765B1 - Method for transfering a fibrous web and machine for producing a fibrous web - Google Patents

Abstract

On the transfer of a moving web of paper or cardboard, taken from a continuous belt (18) between a press nip at the press section (12) and the drying station (14) of a papermaking or cardboard production machine (10), the detached belt is cleaned and conditioned by a water spray from a spray pipe (20). Surplus water is removed from the belt surface by a scraper (22), and any clinging fiber material is caught in a pulper (16). An adjustable paddle (26) is between the press and drying stations which, in the normal position, traps any water spray and shields the drying station and prevents an air flow over the pulper. In a free setting, the detached fiber material can fall freely into the pulper, and air carried by the web is taken off especially at the first cylinder (24) of the drying station.

Description

The invention relates to a method for operating a the production of a fibrous web, in particular paper or board web, serving machine in which the fibrous web is taken on a running through the last nip of the press section endless belt in the dryer section, the endless belt for its cleaning and Conditioning is sprayed with water, the spray is scraped by a scraper from the endless belt and the web transfer process occurring fiber material is collected in a pulper. It further relates to a corresponding machine for producing such a fibrous web.

Such devices are described, for example, in EP-A-0 908 556 and EP-A-0 674 045.

However, there is a need for a most cost-effective and effective interface between the press section, dryer section and the pulper, which is expected to meet the following requirements:

Thus, in the web transfer process from the press to the dryer section accumulating paper must be collected in the pulper. The water produced during normal operation on the scraper (eg approx. 200 l / min) must be drained off separately. The acceptance scraper and the associated lubricating spray pipe, as well as possibly a so-called Enviro scan must be at machine standstill be maintained across the machine. The drying section must be completed in relation to the press section in normal operation, ie on the pulper must not come to the formation of air currents. When removing paper from the first cylinder of the dryer section, the air entrained in the pulper by the paper web must be able to escape. The solution found must be able to cover both the Preßbandausführung and the felt execution equally.

For this purpose, the prior art does not provide a satisfactory solution.

The aim of the invention is therefore to provide an improved method and an improved machine of the type mentioned above, which satisfy the most cost effective and effective manner and in particular the requirements specified above.

This object is achieved according to the invention by a method for operating a the production of a fibrous web, in particular paper or board web, serving machine in which the fibrous web is taken over by a running through the last Preßnip the press section endless belt in the dryer section, the endless Strip is sprayed with water for its cleaning and conditioning, the spray water is scrape off from the endless belt by means of a scraper and pulp material collected during the web transfer process is collected in a pulper, and an adjustable blade is used, and this blade is between one in the area between the press section, Pulper and dryer section lying catching and sealing position in which it absorbs the accumulated during normal operation splashing and the dryer section opposite the press section seals, ie prevents the formation of air currents over the pulper, and a release position is adjusted, in which it releases the pulper for the resulting in the web transfer process fiber material and allows the withdrawal of entrained at the track tee especially on the first cylinder of the drying section air. In this case, a pivotable blade is preferably used. For adjusting the blade, for example, cylinder, ie in particular hydraulic cylinder can be used.

The pulper thus receives e.g. Cylinder swiveling bucket, which collects the accumulated spray water during normal operation and "seals" the dryer section opposite the press section. In Überführfall or tee-off operation on the first cylinder, the blade is e.g. pivoted, whereby the pulper is opened and a deduction of towed at the railway tee air is enabled.

Advantageously, a blade provided with at least one water inlet or port and at least one water outlet, preferably a plurality of water outlet bores, is used. The blade should therefore in particular offer the possibility of rinsing off any remaining paper with water if necessary, which is possible, for example, via a water connection and water outlet bores.

As an endless belt may be provided in particular a press belt or a felt.

According to a preferred practical embodiment of the method according to the invention is for maintenance work on the scraper on the Splashing water supplying device, in particular spray tube, and / or at one or more other facilities provided in the area, such as a so-called Enviro scan, a separate catwalk introduced, preferably pivoted. This catwalk is adjusted or pivoted, for example via hand winches and / or the like.

The object mentioned is also achieved by a machine for producing a fibrous web, in particular paper or board web, in which the fibrous web is taken from a running through the last Preßnip the press section endless belt in the dryer section, which for its cleaning and conditioning with Sprayed water is applied and the scraper is associated, and is collected in the web transfer process resulting pulp material in a pulper, wherein a blade is provided, which lies between a lying between the press section, pulper and dryer section collecting and sealing position in which they during normal operation accumulating spray water and the drying section seals against the press section, ie prevents the formation of air currents over the pulper, and a release position is adjustable, in which it releases the pulper for the fiber material obtained in the web transfer operation and allows the withdrawal of entrained at the railway tee especially on the first cylinder of the dryer section air.

Preferred embodiments of the machine according to the invention are specified in the subclaims.

Figur 1

eine schematische Teildarstellung einer Maschine zur Herstellung einer Faserstoffbahn im Normalbetrieb und

Figur 2

eine mit der Figur 1 vergleichbare schematische Teildarstellung der Maschine im Überführbetrieb bzw. beim Abschlag an dem ersten Zylinder.

The invention will be explained in more detail below with reference to an embodiment with reference to the drawing; in this show:

FIG. 1

a schematic partial view of a machine for producing a fibrous web in normal operation and

FIG. 2

a comparable to Figure 1 schematic partial view of the machine in the transfer operation or at the tee on the first cylinder.

FIGS. 1 and 2 show a schematic partial representation of a machine 10 for producing a fibrous web, which may in particular be a paper or board web. In each case, the region of the interface between the press section 12, the drying section 14 and a pulper 16 is shown.

The fibrous web is taken over in each case by an endless belt 18 running through the last press nip of the press section 12 into the dryer section 14.

The endless belt 18 is associated with its cleaning and conditioning a spray tube 20, via which the endless belt 18 is acted upon with water spray. In addition, a scraper 22 is associated with the belt 18 in order to scrape off the resulting spray water from the belt 18 during normal operation.

In the case of the web transfer operation or tee-off on the first cylinder 24 of the dryer section 14, resulting pulp material is collected in the pulper 16.

As can be seen in FIGS. 1 and 2, a blade 26 preferably associated with the pulper 16 is provided. This is mounted on a holder 30 so as to be pivotable about an axis 28 extending in the machine transverse direction.

In particular, this blade 26 is located between a catching and sealing position lying in the region between the press section 12, pulper 16 and drying section 14 (see FIG. 1), in which it collects the spray water produced during normal operation and the drying section 14 with respect to the press section 12 seals, ie prevents the formation of air currents over the pulper 16, and a release position (see Figure 2) pivots in which it releases the pulper 16 for the resulting during the web transfer process fiber material and the deduction of the train tee especially on the first cylinder 24 of the dryer section 14 entrained air allows.

In the present case, the blade 26 is above cylinder 32, i. especially hydraulic cylinder, adjustable.

The blade 26 may be provided with at least one water inlet or port and at least one water outlet, preferably a plurality of water outlet bores.

The pulper 16 thus receives a cylinder 32 pivotable blade 26 which collects the resulting spray water in normal operation and the drying section 14 with respect to the press section 12 "seals". In Überführfall or tee-off operation on the first cylinder 24 of the drying section 14, the blade 26 is pivoted about the axis 28, whereby the pulper 16 is opened and a withdrawal of the entrained air is made possible at the railway tee.

The blade should offer the possibility of flushing any leftover paper with water as needed, e.g. is achieved by the aforementioned water connection and the water outlet holes.

The endless belt 18 may be formed in particular by a press belt or a felt.

For safety reasons, a separate adjustable, preferably pivotable catwalk 34 may be provided for maintenance work on the scraper 22, on the spray tube 20 and / or on one or more other devices provided in the area in question, eg a so-called enviro-scan the area in question is movable or pivotable. The pivoting of this catwalk 34 can be done for example via hand winches and / or the like, which is relatively inexpensive.

LIST OF REFERENCE NUMBERS

10

machine

12

press section

14

drying section

16

pulper

18

endless band

20

spray wand

22

scraper

24

first cylinder

26

shovel

28

axis

30

bracket

32

Cylinder, hydraulic cylinder

34

catwalk

Claims (16)

1. Method of operating a machine (10) used for producing a fibrous web, in particular paper or board web, in which the fibrous web is taken over into the drying section (14) by an endless belt (18) running through the last press nip of the press section (12), the endless belt (18) has spray water applied to it in order to clean and condition it, the spray water is scraped off the endless belt (18) by means of a doctor (22) and fibrous material accumulating during the web transfer operation is collected in a pulper (16), and in which an adjustable scoop (26) is used and this scoop (26) is displaced between a connecting and sealing position, located in the region between press section (12), pulper (16) and drying section (14), in which it collects spray water accumulating during normal operation and seals off the drying section (14) with respect to the press section (12), that is to say prevents the formation of air flows over the pulper (16), and an exposed position, in which it exposes the pulper (16) to the fibrous material that accumulates during the web transfer operation and permits the extraction of air entrained as the web is knocked off, in particular on the first cylinder (24) of the drying section (14).
2. Method according to Claim 1, in which a pivotable scoop (26) is used.
3. Method according to Claim 1 or 2, characterized in that a scoop (26) that can be displaced by cylinders (32), that is to say preferably hydraulic cylinders, is used.
4. Method according to one of the preceding claims, characterized in that a scoop (26) provided with at least one water inlet or connection and at least one water outlet, preferably a plurality of water outlet holes, is used.
5. Method according to one of the preceding claims, characterized in that the endless belt (18) provided is a press belt.
6. Method according to one of Claims 1 to 4, characterized in that the endless belt (18) provided is a felt.
7. Method according to one of the preceding claims, characterized in that, for maintenance work on the doctor (22), on the device (20) that supplies the spray water, in particular a spray pipe, and/or on one or more other devices provided in the relevant region, for example what is known as an Enviro-Scan, a separate catwalk (34) is introduced, preferably pivoted in.
8. Method according to Claim 7, characterized in that the catwalk (34) is displaced or pivoted via hand-operated winches and/or the like.
9. Machine (10) for producing a fibrous web, in particular paper or board web, in which the fibrous web is taken over into the drying section (14) by an endless belt (18) which runs through the last press nip of the press section (12), to which belt spray water is applied in order to clean and condition it and to which a doctor (22) is assigned, and in which fibrous material accumulating during the web transfer operation is collected in a pulper (16), characterized in that a scoop (26) is provided, which can be displaced between a connecting and sealing position, located in the region between press section (12), pulper (16) and drying section (14), in which it collects spray water accumulating during normal operation and seals off the drying section (14) with respect to the press section (12), that is to say prevents the formation of air flows over the pulper (16), and an exposed position, in which it exposes the pulper (16) to the fibrous material that accumulates during the web transfer operation and permits the extraction of air entrained as the web is knocked off, in particular on the first cylinder (24) of the drying section (14).
10. Machine according to Claim 9, characterized in that the scoop (26) can be pivoted.
11. Machine according to Claim 9 or 10, characterized in that the scoop (26) can be displaced by cylinders (32), that is to say preferably hydraulic cylinders.
12. Machine according to one of Claims 9 to 11, characterized in that the scoop (26) is provided with at least one water inlet or connection and at least one water outlet, preferably a plurality of water outlet holes.
13. Machine according to one of Claims 9 to 12, characterized in that the endless belt (18) is formed by a press belt.
14. Machine according to one of Claims 10 to 12, characterized in that the endless belt (18) is formed by a felt.
15. Machine according to one of Claims 9 to 14, characterized in that, for maintenance work on the doctor (22), on the device (20) that supplies the spray water, in particular a spray pipe, and/or on one or more other devices provided in the relevant region, for example what is known as an Enviro-Scan, a separately displaceable, preferably pivotable, catwalk (34) is provided, which can be moved or pivoted into the relevant region as appropriate.
16. Machine according to Claim 15, characterized in that the catwalk (34) can be displaced or pivoted via hand-operated winches and/or the like.

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