CN110791844B

CN110791844B - Method for adjusting a fiber web nozzle according to a fiber web

Info

Publication number: CN110791844B
Application number: CN201910652569.9A
Authority: CN
Inventors: W·斯莫克
Original assignee: Maschinenfabrik Rieter AG
Current assignee: Maschinenfabrik Rieter AG
Priority date: 2018-08-03
Filing date: 2019-07-19
Publication date: 2023-06-27
Anticipated expiration: 2039-07-19
Also published as: EP3604645A1; TW202016377A; BR102019016148A2; CN110791844A; DE102018118923A1

Abstract

The invention relates to a method for adjusting a fiber web nozzle (1) according to a fiber belt (2) arranged at the output end of a drafting device (3) of a textile machine. According to the invention, the web nozzle (1) is selected from a plurality of different web nozzles (1) according to at least one belt characteristic of the web (2), and the orientation and/or position of the web nozzle relative to the web is adjusted according to the belt characteristic. The invention also relates to a textile machine drafting device for twisting at least one fiber band (2), which comprises a fiber web nozzle (1) arranged at the output end of the drafting device (3) for polymerizing the fiber band (2).

Description

Method for adjusting a fiber web nozzle according to a fiber web

Technical Field

The invention relates to a method for adjusting a fibre web nozzle according to an extended fibre band arranged at the output end of a drawing device of a textile machine. The invention also relates to a textile machine drafting device for twisting at least one fibre band, which has a fibre web nozzle arranged at the output end of the drafting device for polymerizing the fibre band.

Background

A web funnel for compressing a web is known from DE 10 2015 101 704 A1. The web funnel is arranged at the output end of the drawing device for the purpose of polymerizing the stretched fiber band which is twisted by the drawing device, wherein the fiber band leaves the web funnel as a bundle-like fiber band.

Disclosure of Invention

The object of the present invention is to improve the quality of the fibrous strip discharged from the fibrous web hopper.

The solution for achieving the above object of the present invention is a method for adjusting a web nozzle and a drawing device having a web nozzle.

The invention relates to a method for adjusting a fibre web nozzle according to an extended fibre band arranged at the output end of a drawing device of a textile machine. The plurality of individual fiber tapes are polymerized and twisted by means of the drawing device, thereby improving uniformity of the fiber tapes. The fibre band leaves the drawing device as an extended fibre band, i.e. the fibre band has a smaller thickness with respect to the width.

The web nozzle is arranged downstream of the drawing device for polymerizing the stretched fiber web such that the fiber web in bundles leaves the web nozzle. The web nozzle may have an input side on which the stretched fibrous strip enters the web nozzle. The web nozzle may also have an output side on which the polymerized fibrous tape exits the web nozzle. The polymerized fibrous tape may exit the web nozzle via its output orifice. The fibrous tape has a generally circular cross-section as it exits the web nozzle for placement in the tank.

According to the method of the present invention, the web nozzle is selected from a plurality of different web nozzles according to at least one belt characteristic of the stretched web. This allows the web nozzle to be selected from a plurality of different web nozzles such that the quality of the fibrous strip discharged from the web nozzle is optimal or advantageous. Various geometries, shapes, structures and/or materials of the web nozzles may cause different qualities of the web tape discharged from the web nozzle, wherein according to an advantageous approach, the web nozzle is selected that is capable of causing the best quality of the web tape discharged from the web nozzle. Thus, adjusting the web nozzle may refer to selecting the web nozzle from a plurality of different web nozzles, in particular selecting the web nozzle that is most suitable for producing a fibrous tape having fibrous tape characteristics.

These belt characteristics may be, for example, belt weight, belt material, belt width, belt thickness, belt density, and/or belt speed. The web nozzle suitable for the fibrous tape can be selected according to the tape characteristics so as to polymerize the fibrous tape such that the fibrous tape discharged from the web nozzle has the highest quality. For example, a fibrous tape having a relatively high tape thickness may require a particular shape and/or geometry of the web nozzle to achieve a high quality of the fibrous tape exiting the web nozzle.

In addition, in the method, the orientation of the web nozzle relative to the fibrous tape is adjusted based on the tape characteristics. For example, in the case of a high belt speed, the quality of the fibrous belt discharged from the web nozzle can be improved if, for example, the web nozzle is inclined toward the fibrous belt or away from the fibrous belt. It is also possible to continuously change the orientation of the web nozzle with respect to the web while continuously measuring the quality of the web discharged from the web nozzle. This allows the orientation of the discharged fibrous strip to be determined with the best quality. Additionally or alternatively, the orientation may also be performed stepwise and the quality of the discharged fibrous strip measured in order to find the orientation at which the discharged fibrous strip has the best quality. Additionally or alternatively, the adjustment may refer to orienting the web nozzle relative to the fibrous strip.

Additionally or alternatively, the position of the web nozzle relative to the fibrous belt can preferably also be adjusted as a function of the belt properties. The web nozzle may be moved, for example, relative to the fibrous strip in order to improve the quality of the discharged fibrous strip. The web nozzle may be movable relative to the fibrous strip, for example, in one or both transverse directions of the fibrous strip. Additionally or alternatively, the adjustment may refer to positioning the web nozzle relative to the fibrous strip.

The nozzle width of the web nozzle may preferably be selected based on the belt characteristics to adjust, orient and/or position the web nozzle based on the belt width of the fiber belt.

According to a further advantageous embodiment, the minimum bevel distance between two nozzle bevels which are at a distance from each other and are arranged in the inlet region of the fiber web nozzle is selected as a function of the belt properties of the fiber belt. The two nozzle ramps may be arranged such that they direct the fibrous strip entering the web nozzle to the output port. The nozzle ramps may be arranged obliquely to the belt direction of the fiber belt in order to guide the fiber belt. The fiber band may be guided in a converging and/or compressed manner. Thus, these nozzle ramps may be funnel-shaped ramps, as they may act as funnels.

The nozzle ramps polymerize during passage of the web through the web nozzles, so that the ramp distance between the nozzle ramps can be selected based on the characteristics of the belt. Wherein a web nozzle is selected from a plurality of different web nozzles, the distance of the inclined surfaces between the nozzle inclined surfaces results in an optimal quality of the discharged fibrous strip.

According to an advantageous embodiment, the web nozzles are selected with a nozzle width that is greater than the bandwidth of the fiber band. So that the fibrous strip flows completely into or into the web nozzle.

Additionally or alternatively, the web nozzle is preferably selected such that the minimum bevel distance between nozzle bevels is less than the bandwidth of the fibrous strip. In this way, at least a part of the fibre band will hit these nozzle ramps, so that the latter guides the fibre band. The two nozzle slopes are spaced apart from each other so that at least two edge regions of the fibrous strip strike and can be deflected or guided by the respective nozzle slopes as the fibrous strip enters the web nozzle. Depending on the belt characteristics, the bevel distance between the nozzle bevels can be chosen to be small, for example, so that a large part of the fiber belt is deflected by the nozzle bevel. Depending on the nature of the belt, the distance between the nozzle ramps can also be chosen to be large, so that only a small portion of the fiber belt is deflected by the nozzle ramps. This can improve the quality of the fibrous tape discharged from the web nozzle. In this case, the alternative web nozzles have at least in part a minimum bevel distance between the different nozzle bevels.

According to an advantageous solution, the web nozzle is selected with a minimum bevel distance between the nozzle bevels to such an extent that the two edge regions of the fiber band respectively touch the two nozzle bevels by at least 5 mm. The web nozzle may also be selected with a minimum bevel distance between the nozzle bevels to such an extent that the two edge regions of the fibrous strip respectively contact the two nozzle bevels by at least 10 mm. This allows deflection of the edge regions of the fiber web without the central region of the fiber web between these edge regions coming into contact with the nozzle ramp and thus passing through the nozzle ramp into the outlet in a non-deflected manner. This can improve the quality of the fibrous strip exiting the web nozzle.

According to an advantageous solution, the web nozzle is selected with a minimum bevel distance between its nozzle bevels to such an extent that the two edge regions of the fiber band contact the two nozzle bevels at least 10% of the bandwidth at the time of the initial impact. The web nozzle may also be selected with a minimum bevel distance between nozzle bevels to such an extent that both edge regions of the fibrous strip contact both nozzle bevels at least 25% of the bandwidth. Wherein the web nozzle is selected such that the minimum bevel distance between nozzle bevels is to a degree such that each edge region contacts a corresponding nozzle bevel at 10% or 25% of the bandwidth. This allows the nozzle to deflect the two edge regions obliquely, while the central region between these edge regions can flow substantially unimpeded into the outlet opening of the web nozzle. Thereby facilitating polymerization of the fibrous tapes to enhance the quality of the discharged fibrous tapes.

The web nozzle is preferably selected such that the wall angle between its dividing wall and its cross-section in its longitudinal direction is 60 ° to 90 °. The wall angle may also be 70 ° to 85 °. This wall angle may also be 78 °. In this way, the dividing wall is inclined towards the bottom surface of the web nozzle. The wall angle is also the angle between the dividing wall and the bottom surface. In the case of a boundary wall which is inclined at a wall angle toward the bottom surface, the reverse flow of the fiber tape against the tape direction can be reduced. In this case, the dividing wall forms the shape of a suspension projection which is inclined towards the bottom surface of the web nozzle or towards the fiber impingement zone of the fiber band impingement web nozzle.

The web nozzle is preferably adjusted relative to the web such that the angle of fiber impingement between the web direction of the web nozzle and the cross section of the web nozzle in the longitudinal direction of the web nozzle is 70 ° to 80 °. The fiber impingement angle may also be 73 ° to 75 °. The belt direction is referred to herein as the direction the fibrous belt has immediately before it hits the web nozzle. The fiber impingement angle may also be formed between the belt direction and the bottom surface. This facilitates the impingement of the fibrous strip against the web nozzle 1.

According to a further advantageous embodiment, the fiber web nozzle is adjusted relative to the fiber web in such a way that the fiber web impinges on the dividing wall at a distance of 3mm to 8mm. The impact distance may also be 6mm. The fibrous strip impinges the web nozzle in the fibrous landing zone, and thus the impingement distance may also be defined as the distance between the fibrous landing zone and the boundary wall. By means of this impact distance, the fibre band can hit the dividing wall after a short path, i.e. after the impact distance, and can be guided into the outlet opening. The impingement distance may also be such that the fibrous landing zone is positioned above the output opening such that at least a portion of the fibrous strip flows directly into the output opening. Furthermore, by this impingement distance, the fiber band may form a vortex in the area between the fiber landing zone and the boundary wall after it impinges on the fiber web nozzle. Each of the two edge regions of the fibrous strip forms a vortex having an opposite orientation and flowing from the respective edge region of the fibrous strip into the outlet opening. The two edge regions each form a fiber band vortex towards the outlet opening, which for example enters the outlet opening in a manner similar to the vortex of the outlet opening. This facilitates the flow of the fibrous strip into the output port, thereby improving the quality of the fibrous strip exiting the web nozzle. The impact distance may be varied, for example, in the case of another strip of material being compressed by the web nozzle. In the event of a change in the belt material having different densities and/or strengths, the impingement distance can be varied in order to obtain the best quality of the fiber belt discharged from the fiber web nozzle.

According to an advantageous embodiment, the deflection angle of the web nozzle is adjusted according to the belt characteristics. The deflection angle may be the orientation of the web nozzle relative to the roller pair and/or relative to the fibrous strip. The impingement distance and/or the position of the fiber landing zone in the fiber web nozzle can be adjusted by adjusting the deflection angle. In the case of a deflection of the web nozzle to move the dividing wall away from the fiber web, the impact distance increases. And in the case of a deflection of the web nozzle such that the dividing wall approaches the fibrous strip, the impingement distance is reduced. The web nozzle may deflect about a deflection axis disposed downstream of the web nozzle in the belt direction. The angle of impact of the fibers can be varied and/or will be varied by adjusting the deflection angle. According to an advantageous solution, there is no need to change the horizontal position of the drawing device arranged upstream of the web nozzle, for example.

The fiber landing zone of the fiber band can be moved by adjusting the deflection axis. This allows the fiber landing zone to be adjusted so that it is above the outlet.

The deflection angle may also be adjusted by: an in particular adjustable stop is arranged in the deflection travel. The deflection angle can be specified by adjusting the stop. The position of the stop is movable. The stop may for example be moved towards the fibre band or away from the fibre band.

Additionally or alternatively, the deflection angle may be adjusted manually and/or by means of an actuator. The actuator may be an electric motor, a linear motor or a servo motor.

To quickly determine which web nozzle is suitable for use with which fibrous strip having the characteristic, the nozzle width, the distance between the nozzle ramps, the orientation and/or position of the web nozzle relative to the fibrous strip can be graphically determined. This graph can be found empirically, for example, which web nozzle provides the highest quality of the web discharged from the web nozzle on a web having a belt characteristic.

According to a further advantageous embodiment, a fiber band guiding device arranged upstream of the drawing device is adjusted as a function of the band properties. Additionally or alternatively, a web guide arranged upstream of the drawing device can also be adjusted depending on the web nozzle selected. The fiber tape guide device is arranged upstream of the drafting device in the tape direction of the fiber tape. By means of the fiber band guiding device, the bandwidth of the fiber band can be changed, for example. The fiber band guiding device can have, for example, two spiral surfaces with opposite directions, between which the fiber band is guided. When these spiral surfaces are twisted with respect to the fiber ribbon, the distance between the two surfaces changes. By twisting the two spiral-shaped surfaces, the bandwidth of the fiber band can be adjusted.

According to a further advantageous embodiment, the web nozzle is adjusted before the drafting device is operated. This allows for comfortable adjustment of the web nozzle.

According to a further advantageous embodiment, the web nozzle is adjusted under the influence of at least one deflection roller guiding the fiber web. The deflection roller is stressed when the drafting device is in operation, so that the state of the fiber web nozzle closest to the fiber belt when the drafting device is in operation is adjusted when the deflection roller is stressed.

The invention also relates to a drawing device for a textile machine for twisting at least one fiber strand. A web nozzle for polymerizing the fiber web is arranged at the output end of the drawing device. The drawing device may, for example, have a twisting zone for twisting the fiber band. The twisting zone may also have at least two roller pairs, for example. The fiber band can pass between the rollers of the roller pair. By means of the different rotational speeds of the two roller pairs, the fiber band can be twisted.

According to the invention, the web nozzles are selected and/or set according to one or more of the method features described hereinabove and/or hereinbelow.

According to an advantageous embodiment, the orientation between the roller pairs of the drafting device and the web nozzle is variable. By changing the orientation, for example, the angle of entry of the fiber strip into the fiber web nozzle can be adjusted. Furthermore, the roller pairs can be deflected, for example, in order to change the angle of entry of the fiber band into the fiber web nozzle.

The drafting device may have in particular adjustable stops in order to rest the web nozzle against these stops. The drafting device may also have an actuator for deflecting the web nozzle against the roller pair. The deflection angle of the web nozzle relative to the roller pairs can be adjusted. The web nozzle is preferably deflectable about a deflection axis. The web nozzle may be supported in a deflection about a deflection axis.

Additionally or alternatively, the position between the drafting device roller pairs and the web nozzle can also be variable. By changing this position the web nozzle can be moved relative to the roller pair. This allows for example for the adjustment of the fibre landing zone to the outlet. The web nozzles may be arranged, for example, on a track on which they are movable. The web nozzle may also be movable by means of an actuator. The positioning of the web nozzle by the opposing roller pair also enables the movement of the fiber landing zone until it is, for example, at least partially above the output opening.

The roller pair comprises an output roller pair. In addition or as an alternative, the roller pair may also comprise a deflection roller.

Drawings

Further advantages of the invention are described in the following description of the embodiments. Wherein:

figure 1 is a side cross-sectional view of a drawing device, web nozzle and fibrous belt,

FIG. 2 is a front cross-sectional view of a web nozzle and a fibrous strip, an

FIG. 3 is a perspective view of a web nozzle having a fibrous landing zone.

Detailed Description

Fig. 1 is a side cross-sectional view of a drawing device 3, a web nozzle 1 and an exemplary fiber belt 2. The fiber band 2 can be twisted by means of the drawing device 3, and homogenized in the process. Thereby improving the quality of the fibrous tape 2. According to the present embodiment, the drawing device 3 has a pair of take-off rollers 4 between which the fiber ribbon 2 passes. The drawing device 3 is only partially shown in this figure, since it is also possible to have more roller pairs, not shown.

The drawing device 3 also has deflection rollers 5 in order to deflect the fibre band 2 in the present embodiment towards the fibre web nozzle 1. The fibre band 2 leaves the drawing device 3 in stretched form. The roller pairs of the drafting device 3 may also comprise deflection rollers 5.

After the fiber band 2 has passed through the drawing device 3, it reaches the fiber web nozzle 1, which can polymerize and stretch the fiber band 2. The fibre band 2 passes through the fibre web nozzle 1, is compressed and leaves the fibre web nozzle 1 via the outlet opening 6 and the outlet channel 7 of the fibre web nozzle 1. As the fibre band 2 leaves the fibre-web nozzle 1, it has a bundle-like shape to facilitate its placement in a tank, not shown. The fibrous strip 2 has an approximately circular cross section as it exits the web nozzle 1.

For extruding, compressing or polymerizing the stretched fiber web 2, the fiber web nozzle 1 of the present embodiment has at least one nozzle slope 9. The web nozzle 1 also has at least one step 10 for polymerizing the fibrous strip 2.

According to the embodiment shown in fig. 1, the web nozzle 1 is adjusted according to at least one belt characteristic. The web nozzle 1 may be positioned and/or oriented with respect to the fibrous belt 2 according to the belt characteristics. The belt characteristics may be, for example, belt weight, belt material, belt width, belt density, and/or belt speed. The stretched fiber web 2 may be extruded, compressed or polymerized according to the belt characteristics, and thus the fiber web nozzle 1 is adjusted according to the belt characteristics, which is advantageous in terms of the quality of the fiber web 2 discharged from the fiber web nozzle 1. The state of the fibre band 2 at the time of polymerization may for example be related to the band speed of the fibre band 2 entering the fibre-web nozzle 1. The web nozzle 1 is adjusted according to the belt speed, so that the polymerization effect can be improved, thereby improving the quality of the fiber belt 2 discharged from the web nozzle 1.

For example, the fiber impingement angle α at which the fiber band 2 impinges on the bottom surface 12 of the fiber web nozzle 1 can be adjusted. Accordingly, the fiber impact angle α is defined as the angle between the fiber band 2 or the band direction BR of the fiber band 2 and the bottom surface 12. The fiber impingement angle α may also be defined as the angle between the fiber band 2 or the band direction BR of the fiber band 2 and the cross section of the fiber web nozzle 1 in its longitudinal direction.

The fiber impingement angle α may be 70 ° to 80 °. The fiber impingement angle α may also be 73 ° to 75 °. By means of this fibre impingement angle α, which is in particular smaller than 90 °, the condition of the fibre band 2 when it impinges on the bottom 12 can be adjusted. According to the present embodiment, the fibrous landing zone Z is so configured that it is at least partially arranged in or on the outlet 6. Accordingly, at least a portion of the fibrous strip 2, particularly the intermediate portion, flows directly into the outlet 6. Furthermore, in the case of a fiber ribbon passing through the nozzle bevel 9, in particular through the step 10, the edge region of the fiber ribbon 2 forms a fiber ribbon vortex 11. The fiber band vortex 11 prevents the portion of the fiber band 2 from being collided with the output port 6 uncontrollably when flowing in, thereby preventing the uniformity of the fiber band 2 from being deteriorated. The fibre band 2 then flows towards the outlet opening 6 and into it. The fibrous strip 2 is extruded, compressed or polymerized during its flow to the outlet 6.

The fiber band 2 can be guided to the output port 6 by the fiber band vortex 11 without crossing the fiber portions of the fiber band 2, so that the quality of the fiber band 2 discharged from the fiber web nozzle 1 can be improved. To form the fiber band vortex 11, it is preferable to make the fiber impingement angle α within the above-described range. The fiber band vortex 11 can be changed to find the highest quality of the fiber band 2 discharged from the fiber web nozzle 1 by changing the fiber impingement angle α, for example, during operation of the drawing device 3, i.e. during passage of the fiber band 2 through the fiber web nozzle 1. To change the fiber impingement angle α, the fiber web nozzle 1 can be rotatably supported by means not shown in the drawing, so that the fiber web nozzle 1 is deflected, for example.

Advantageously, the web nozzle 1 can be adjusted in such a way that the impact distance a between the fiber landing zone Z and the dividing wall 8 is 3mm to 8mm. The impact distance a may also be 6mm. The impact distance a between the fibre landing zone Z and the dividing wall 8 can be set in such a way that the fibre band whirl 11 is advantageously stretched. The impact distance a is preferably set such that the fiber landing zone Z is at least partially arranged in or on the outlet opening 6. In this case, at least a portion of the fibrous strip 2 flows directly into the outlet 6. This can improve the quality of the fibrous tape 2 discharged from the web nozzle 1. The web nozzle 1 can be arranged on a component, not shown in the figures, such as a rail, in order to be able to move the web nozzle 1 relative to the web 2, in particular during operation of the drawing device 3, in order to adjust the impact distance a. The fiber landing zone Z can also be set such that it is arranged between the outlet opening 6 and the dividing wall 8. Alternatively, the web nozzle 1 can be configured such that the fiber landing zone Z is on the side of the outlet opening 6 facing away from the dividing wall 8. According to the present embodiment, the web nozzle 1 is set such that the fiber landing zone Z is at the output 6.

The web nozzle 1 is preferably configured such that the wall angle β between the dividing wall 8 and the cross section of the web nozzle 1 in its longitudinal direction is 60 ° to 90 °. The wall angle β may also be 70 ° to 85 °. The wall angle beta may also be 78 deg.. The wall angle beta may also be defined between the dividing wall 8 and the bottom surface 12. The bottom surface 12 is here parallel to the cross section of the web nozzle 1 in its longitudinal direction. According to the present embodiment, the wall angle β of the dividing wall 8 with the bottom surface 12 is, for example, 90 °. In alternative embodiments, the wall angle β may be less than 90 °, for example 78 °. In this case, the dividing wall 8 is inclined toward the bottom 12 and/or toward the outlet 6. The dividing wall 8 thus forms the shape of a hanging projection. By means of this suspension-type dividing wall 8 the following can be suppressed: the fiber web 2 extends along the dividing wall 8 opposite the web direction BR upwards or towards the inlet side 14 of the fiber web nozzle 1 (see fig. 2). In this case, the dividing wall 8 has a roof shape. According to a further advantageous embodiment, the fiber web nozzle 1 is constructed such that the angle between the dividing wall 8 and the bottom 12 is less than 90 ° or greater than 90 °. Thereby improving the stretching of the fiber band vortex 11.

Additionally or alternatively, the web nozzle 1 is preferably selected, wherein the distance between the dividing wall 8 and the outlet opening 6 is adjusted according to the belt characteristics of the fiber belt 2. This allows the extent of the spatial extension of the fiber band vortex 11 between the dividing wall 8 and the outlet opening 6 to be adjusted.

According to the present embodiment, the web nozzle 1 is inclined at a deflection angle γ. The web nozzle 1 can be deflected about a deflection axis S in order to adjust the deflection angle γ. The web nozzle 1 is preferably mounted in a deflection axis S. The impingement distance a can be adjusted by deflection of the web nozzle 1. Furthermore, the fiber landing zone Z can be moved by deflecting the web nozzle 1 about the deflection axis S. For example, in the case of a fibre landing zone Z which is not located above the outlet opening 6, the fibre web nozzle 1 can be deflected or the deflection angle γ can be adjusted in such a way that the fibre landing zone Z is arranged above the outlet opening 6.

According to a further advantageous embodiment, the web nozzle 1 can be deflected by means of an actuator, not shown in the figures, in order to automatically deflect the web nozzle 1, for example, as a function of the belt properties, in particular as a function of the belt material. The web nozzle 1 and/or the drawing device 3 may also have stops, not shown in the figures, in order to rest the web nozzle 1 against these stops.

Fig. 2 shows a web nozzle 1 with an extended fiber band 2, which is polymerized into a bundle of fiber bands 2 with the fiber web nozzle 1. The stretched fiber web 2 enters the fiber web nozzle 1 on an input side 14 thereof and exits the fiber web nozzle 1 on an output side 15 thereof. The fibrous strip 2 also has a transverse direction QR which is in particular perpendicular to the strip direction BR. Fig. 2 is a front cross-sectional view.

In this embodiment, a first nozzle bevel 9a and a second nozzle bevel 9b are arranged between the input side 14 and the output side 15. The two

nozzle bevels

9a,9b are arranged obliquely with respect to the belt direction BR in order to guide the fiber belt 2 through the two

nozzle bevels

9a,9b to the outlet opening 6.

In this embodiment, the web nozzle 1 also has two

steps

10a, 10b. The first step 10a is arranged between the first nozzle slope 9a and the bottom surface 12 or the outlet 6. The second step 10b is arranged between the second nozzle slope 9b and the bottom surface 12 or the outlet 6. According to the present embodiment, the

steps

10a, 10b are immediately adjacent to the nozzle bevels 9a, 9b. By means of the

steps

10a, 10b, the fibre band 2 slides down the way to the outlet 6. The fiber band 2 can be compressed by the

steps

10a, 10b.

According to the present embodiment, the nozzle ramps 9a,9b have a ramp distance AS. The bevel distance AS is the minimum distance between the two

nozzle bevels

9a, 9b. The two

steps

10a, 10b are next to the

respective nozzle bevel

9a,9b, so that the

steps

10a, 10b likewise have a bevel distance AS.

According to the present embodiment, at least the

edge regions

13a,13b of the fibrous strip 2 contact the

respective nozzle ramps

9a, 9b. The bandwidth BB of the fiber band 2 is greater than this minimum bevel distance AS, so that the

edge regions

13a,13b contact the nozzle bevels 9a, 9b. For example, a web nozzle 1 of a type having a bevel distance AS of less than 10mm, preferably 20mm, of the bandwidth BB may be selected. Thus, the

edge regions

13a,13b contact the nozzle bevels 9a,9b, respectively, by 5mm, preferably 10 mm.

It is also possible to choose a web nozzle 1 such that the bandwidth BB is greater than 20%, preferably 50%, of the bevel distance AS. Thus, the

edge regions

13a,13b contact the

nozzle slopes

9a,9b, respectively, at 10%, preferably 25%, of the bandwidth BB.

However, it is also possible to choose a web nozzle 1 whose bevel distance AS is greater than the bandwidth BB, so that the fiber band 2 does not touch the

nozzle bevel

9a, 9b. In this case, the fiber tape 2 contacts only the bottom surface 12. This is advantageous for relatively narrow fibre bands 2 whose bandwidth BB for example has the extension of the outlet opening 6. The bandwidth BB of such a fibre band 2 is for example 2-5 times the diameter of the outlet opening 6.

Fig. 3 is a perspective view of a web nozzle 1 having a fibrous landing zone Z. The view direction in the figure is from the input side 14 towards the output side 15 of the web nozzle 1. The viewing direction is also parallel to the tape direction BR. The fibrous landing zone Z is at least partially arranged on the outlet 6. The output port 6 at least partially intersects the fibrous landing zone Z. To this end, the web nozzles 1 are positioned and/or oriented with respect to the fibrous strip 2 in such a way that the fibrous landing zone Z is arranged in the area shown in fig. 3. Furthermore, a fibre landing zone Z is arranged centrally between the nozzle bevels 9a, 9b.

Furthermore, the nozzle width DB of the web nozzle 1 can also be adjusted according to the belt characteristics of the fiber belt 2.

The invention is not limited to the embodiments shown and described. Variations within the scope of the claims may be employed, as well as combinations of features, even if such features are disclosed and described in different embodiments.

Reference numeral table

1. Fiber web nozzle

2. Fiber band

3. Drafting device

4. Output roller pair

5. Deflection roller

6. Output port

7. Output channel

8. Demarcation wall

9. Nozzle incline

10. Step part

11. Fiber band vortex

12. Bottom surface

13. Edge region

14. Input side

15. Output side

BR belt direction

Impact distance A

Z-fiber landing zone

Angle of impact of alpha fibers

Beta wall angle

Angle of gamma deflection

BB bandwidth

AS slope distance

QR transverse direction

DB nozzle width

S deflection shaft

Claims

1. A method for adjusting a fibre web nozzle (1) in dependence on an extended fibre web (2) arranged at the output end of a drafting device (3) of a textile machine, the fibre web nozzle (1) being used for polymerising the fibre web (2), the fibre web (2) having a beam-like shape when the fibre web (2) leaves the fibre web nozzle (1),

it is characterized in that the method comprises the steps of,

-selecting the web nozzle (1) from a plurality of different web nozzles (1) according to at least one belt characteristic of the stretched web (2), and-adjusting the orientation and/or position of the web nozzle (1) relative to the web (2) according to the belt characteristic;

to adjust the orientation, rotating the web nozzle (1) to change the fiber impingement angle (α);

in order to adjust the position, the impact distance (A) between the fibre landing zone (Z) and the dividing wall (8) is adjusted.

2. The method according to claim 1, characterized in that the nozzle width (DB) of the web nozzle (1) is selected in accordance with the belt characteristics of the fiber belt (2).

3. A method according to claim 1, characterized in that the minimum bevel distance (AS) between two nozzle bevels (9 a,9 b) which are at a distance from each other and are arranged in the inlet area of the web nozzle (1) is selected in accordance with the belt characteristics of the fiber belt (2).

4. A method according to any one of claims 1-3, characterized in that the web nozzle (1) is selected with a nozzle width (DB) that is larger than the bandwidth (BB) of the fibrous strip (2), and/or that the web nozzle (1) is selected with a minimum bevel distance (AS) between nozzle bevels (9 a,9 b) that is smaller than the bandwidth (BB) of the fibrous strip (2).

5. A method according to any one of claims 1-3, characterized in that the web nozzle (1) is selected with a minimum bevel distance (AS) between the nozzle bevels (9 a,9 b) to such an extent that the two edge regions (13 a,13 b) of the fibrous strip (2) contact the nozzle bevels (9 a,9 b) at least 5mm when the web nozzle (1) is first hit.

6. The method according to claim 5, characterized in that the two edge areas (13 a,13 b) of the fibrous strip (2) contact the nozzle ramp (9 a,9 b) at 10mm when the web nozzle (1) is first hit.

7. A method according to claim 4, characterized in that the web nozzle (1) is selected with a minimum bevel distance (AS) between the nozzle bevels (9 a,9 b) to such an extent that the two edge regions (13 a,13 b) of the fibrous strip (2) contact the nozzle bevels (9 a,9 b) at least 10% of the bandwidth (BB) when the web nozzle (1) is first hit.

8. The method according to claim 7, characterized in that the two edge areas (13 a,13 b) of the fibrous strip (2) contact the nozzle ramp (9 a,9 b) at 25% of the bandwidth (BB) when the fibrous web nozzle (1) is first hit.

9. A method according to any one of claims 1-3, characterized in that the web nozzle (1) is selected with a wall angle (β) between its dividing wall (8) and the cross-section of the web nozzle (1) in the longitudinal direction of the web nozzle (1) of 60 ° to 90 °.

10. A method according to claim 9, characterized in that the wall angle (β) is 70 ° to 85 °.

11. A method according to claim 10, characterized in that the wall angle (β) is 78 °.

12. A method according to any one of claims 1-3, characterized in that the fibre web nozzle (1) is adjusted relative to the fibre web (2) such that the angle of fibre impingement (α) between the web direction (BR) of the fibre web (2) and the cross-section of the fibre web nozzle (1) in the longitudinal direction of the fibre web nozzle (1) is 70 ° to 80 °.

13. The method according to claim 12, characterized in that the fiber impingement angle (α) is 73 ° to 75 °.

14. The method according to claim 9, characterized in that the web nozzle (1) is adjusted relative to the fiber band (2) such that the impingement distance (a) of the fiber band (2) with the dividing wall (8) is 3mm to 8mm.

15. The method of claim 14, wherein the strike distance (a) is 6mm.

16. A method according to any one of claims 1-3, characterized in that the deflection angle (γ) of the web nozzle (1) is adjusted in accordance with the belt characteristics.

17. Method according to claim 4, characterized in that the nozzle width (DB), the bevel distance (AS) between the nozzle bevels (9 a,9 b), the orientation and/or the position of the web nozzle (1) with respect to the fiber band (2) are determined by means of a graph.

18. A method according to any one of claims 1-3, characterized in that the position of a fibrous web guiding device arranged upstream of the drawing device (3) is adjusted in accordance with the web characteristics and/or the selected fibrous web nozzle (1).

19. A method according to any one of claims 1-3, characterized in that the web nozzle (1) is adjusted before and/or during operation of the drawing device (3) and/or the web nozzle (1) is adjusted in the event of a force of at least one deflection roller (5) guiding the fiber web (2).

20. A textile machine drafting device (3) for twisting at least one fiber band (2) has a fiber web nozzle (1) arranged at the output end of the drafting device (3) for polymerizing the fiber band (2),

it is characterized in that the method comprises the steps of,

the web nozzle (1) being selected and/or adjusted according to the method of any one of claims 1-19.

21. Drafting device according to claim 20, characterized in that the orientation and/or position between the roller pair (4) of the drafting device (3) and the web nozzle (1) is variable.