CN110791844A

CN110791844A - Method for adjusting a fiber web nozzle according to a fiber band

Info

Publication number: CN110791844A
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: 2020-02-14
Anticipated expiration: 2039-07-19
Also published as: CN110791844B; EP3604645A1; TW202016377A; BR102019016148A2; DE102018118923A1

Abstract

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

Description

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

Technical Field

The invention relates to a method for adjusting a fiber web nozzle according to a stretched fiber belt arranged on an output end of a drafting device of a textile machine. The invention also relates to a drafting device of a textile machine for twisting at least one fiber band, comprising a fiber web nozzle arranged on an output end of the drafting device for converging the fiber band.

Background

A fiber web funnel for compressing a fiber web is known from DE 102015101704 a 1. The fiber web funnel is arranged at the output end of the drafting device in order to converge the stretched fiber band twisted by the drafting device, wherein the fiber band leaves the fiber web funnel as a bundle-shaped fiber band.

Disclosure of Invention

The object of the invention is to improve the quality of the fiber band discharged from the fiber web funnel.

The solution of the invention to achieve the above object is a method of adjusting a web nozzle and a drawing device with a web nozzle.

The invention relates to a method for adjusting the fiber net nozzle according to the stretched fiber belt arranged on the output end of the drafting device of a textile machine. The plurality of individual fiber bands are gathered and twisted by means of the drafting device, so that the uniformity of the fiber bands is improved. The fiber band leaves the drawing frame as a stretched fiber band, i.e. the fiber band has a small thickness in relation to the width.

The web nozzle is arranged downstream of the drawing device in order to converge the stretched fiber band such that the strand-like fiber band leaves the web nozzle. The fibre web nozzle may have an input side on which the stretched fibre band enters the fibre web nozzle. The web nozzle may also have an output side on which the polymeric fiber ribbon exits the web nozzle. The polymeric fiber ribbon may exit the web nozzle via its output opening. The fiber tape has a generally circular cross-section as it exits the web nozzle for placement in the tank.

According to the method of the invention, the web nozzle is selected from a plurality of different web nozzles depending on at least one belt property of the stretched fiber belt. This makes it possible to select the fibre web nozzle from a plurality of different fibre web nozzles such that the quality of the fibre band emerging from the fibre web nozzle is optimal or advantageous. The various geometries, shapes, structures and/or materials of the fibre web nozzle may result in different qualities of the fibre band discharged from the fibre web nozzle, wherein according to an advantageous solution a fibre web nozzle is selected which is capable of resulting in the best quality of the fibre band discharged from the fibre 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 best suited for producing a fibrous web having web properties.

The belt characteristics may be, for example, belt weight, belt material, belt width, belt thickness, belt density, and/or belt speed. Depending on the belt properties, a suitable fibre web nozzle can be selected for the fibre belt in order to polymerize the fibre belt so that the fibre belt emerging from the fibre web nozzle has the highest quality. For example, a fibrous web having a relatively high web thickness may require a particular shape and/or geometry of the web nozzle in order to achieve a high quality of the fibrous web discharged from the web nozzle.

Also in the method, the orientation of the web nozzles relative to the fiber band is adjusted according to the band characteristics. For example, at high belt speeds, the quality of the fiber web discharged from the fiber web nozzle can be improved if, for example, the fiber web nozzle is inclined toward the fiber web or inclined away from the fiber web. It is also possible to continuously vary the orientation of the web nozzle relative to the web while continuously measuring the quality of the web discharged from the web nozzle. This allows the orientation of the discharged fiber band to be determined with the best quality. In addition or alternatively, the orientation can also be carried out step by step and the quality of the discharged fiber band can be determined in order to find the orientation at which the discharged fiber band has the best quality. Additionally or alternatively, the adjustment may refer to orienting the web nozzle relative to the fiber band.

Additionally or alternatively, the position of the fiber web nozzle relative to the fiber band can also be adjusted, preferably as a function of the band properties. For example, the web nozzle can be moved relative to the fiber band in order to improve the quality of the discharged fiber band. The web nozzle may be moved relative to the web, for example, in one or both cross-machine directions of the web. Additionally or alternatively, the adjustment may refer to positioning the web nozzle relative to the fiber band.

The nozzle width of the web nozzle may preferably be selected in dependence of the belt properties in order to adjust, orient and/or position the web nozzle in dependence of the belt width of the fibre belt.

According to a further advantageous embodiment, the minimum ramp distance between two nozzle ramps which are arranged at a distance from one another and in the entry 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 guide the fiber web entering the fiber web nozzle to the output opening. These nozzle ramps can be arranged obliquely to the direction of the fiber band in order to guide the fiber band. The fiber band can 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 bevels polymerize as the fiber ribbon passes through the web nozzles, so that the bevel distance between the nozzle bevels can be selected based on the ribbon characteristics. Wherein a web nozzle is selected from a plurality of different web nozzles, the bevel distance between the nozzle bevels leading to an optimum quality of the discharged fibre band.

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

Additionally or alternatively, the web nozzles are preferably selected such that the minimum ramp distance between nozzle ramps is less than the width of the fiber band. In this way, at least a portion of the fiber band impinges upon the nozzle ramps to guide the latter. The two nozzle bevels are at a distance from each other so that at least the two edge regions of the fibre band will hit the respective nozzle bevel and be deflected or guided by it when the fibre band enters the fibre web nozzle. Depending on the belt properties, the ramp distance between the nozzle ramps can be selected to be small, for example, so that a large part of the fiber belt is deflected by the nozzle ramps. Depending on the belt characteristics, the ramp distance between the nozzle ramps may also be selected to be large so that only a small portion of the fiber belt is deflected by the nozzle ramps. This improves the quality of the fibrous web discharged from the web nozzle. In this case, alternative web nozzles have, at least in part, different minimum ramp distances between nozzle ramps.

According to an advantageous solution, the web nozzles are selected with a minimum bevel distance between the nozzle bevels to such an extent that both edge areas of the fibre band touch both nozzle bevels with at least 5mm each. It is also possible to select the web nozzles with a minimum bevel distance between the nozzle bevels to such an extent that both edge areas of the fibre band touch both nozzle bevels at least 10mm each. This makes it possible to deflect the edge regions of the fibre band, while the central region of the fibre band between these edge regions does not come into contact with the nozzle ramp and thus passes through the nozzle ramp into the outlet opening without deflection. This improves the quality of the fibre band leaving the fibre web nozzle.

According to an advantageous solution, the web nozzles are selected with a minimum bevel distance between their nozzle bevels to such an extent that both edge areas of the fibre band upon initial impact touch both nozzle bevels with at least 10% of the band width. The web nozzles may also be selected such that the minimum bevel distance between the nozzle bevels is such that both edge regions of the fiber band contact both nozzle bevels by at least 25% of the band width. Wherein the web nozzles are selected such that the minimum bevel distance between the nozzle bevels is such that each edge region contacts the respective nozzle bevel at 10% or 25% of the bandwidth. This makes it possible to deflect the two edge regions with the nozzle obliquely, while the central region between the edge regions can flow essentially unhindered into the outlet opening of the web nozzle. Thereby facilitating the aggregation of the fiber band in order to improve the quality of the discharged fiber band.

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

The fiber web nozzle is preferably adjusted relative to the fiber web so that the fiber impact angle between the web direction of the fiber web and the cross section of the fiber web nozzle in the longitudinal direction of the fiber web nozzle is 70 ° to 80 °. The fiber impact angle may also be 73 ° to 75 °. The belt direction here refers to the direction which the fibre belt has immediately before hitting the fibre web nozzle. The fiber impact angle may also be formed between the belt direction and the bottom surface. This facilitates the impingement of the fiber band on the fiber web nozzle 1.

According to a further advantageous embodiment, the fiber web nozzle is adjusted relative to the fiber band in such a way that the fiber band has an impact distance of 3mm to 8mm with the boundary wall. The impact distance may also be 6 mm. The fibrous web impacts the web nozzle in the fibrous landing zone, whereby the impact distance can also be defined as the distance between the fibrous landing zone and the dividing wall. By this impingement distance, the fibre band can, after a short path, i.e. after the impingement distance, impinge on the boundary wall and can be guided into the outlet opening. The impingement distance may also be such that the fiber landing zone is located above the output opening so that at least a portion of the fiber band 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 the fiber web nozzle. Each of these two edge regions of the fiber band forms a vortex which has an opposite orientation and flows from the respective edge region of the fiber band into the outlet opening. These two edge regions each form a fiber band vortex towards the outlet opening, which enters the outlet opening, for example, in a manner similar to the vortex of the outlet opening. This facilitates the flow of the fiber web into the output opening, thereby improving the quality of the fiber web discharged from the fiber web nozzle. The impingement distance can be varied, for example, in the case of compression of another strip material by the web nozzle. In the case of a change of belt material with different density and/or strength, the impingement distance can be changed in order to obtain the best quality of the fibrous belt discharged from the fibrous web nozzle.

According to an advantageous embodiment, the deflection angle of the fiber web nozzle is adjusted as a function of the belt properties. The deflection angle can be the orientation of the web nozzle relative to the roller pair and/or relative to the fiber band. By adjusting the deflection angle, the impact distance and/or the position of the fiber landing zone in the fiber web nozzle can be adjusted. In the case of deflection of the web nozzle in order to move the dividing wall away from the fiber band, the impingement distance increases. Whereas in the case of deflection of the web nozzle to bring the dividing wall close to the fibre band, the impingement distance is reduced. The web nozzles may be deflected about a deflection axis arranged downstream of the web nozzles in the belt direction. By adjusting the deflection angle, the fibre impact angle can be changed and/or will be changed. According to an advantageous solution, for example, no change in the horizontal position of the drawing device arranged upstream of the web nozzle is required.

The fiber landing zone of the fiber tape can be moved by adjusting the deflection axis. This allows the fiber landing zone to be adjusted to be above the output opening.

The deflection angle can also be adjusted by: a stop, which is in particular adjustable, is arranged in the deflection path. By adjusting the stop, the angle of deflection can be defined. The position of the stop is movable. The stop can be moved, for example, towards the fiber band or away from the fiber band.

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

In order to quickly decide which web nozzle is suitable for which fibre band with band properties, the nozzle width, the ramp distance between the nozzle ramps, the orientation and/or the position of the web nozzle relative to the fibre band can be determined by means of a graph. This diagram can be determined empirically, for example, which web nozzle provides the highest quality of the fiber web discharged from the web nozzle on a certain fiber web having the web characteristics.

According to a further advantageous embodiment, the fiber band guidance device arranged upstream of the drafting device is adjusted as a function of the band characteristic. In addition or alternatively, the fiber band guidance device arranged upstream of the drawing device can also be adjusted depending on the selected fiber web nozzle. The fiber band guide device is arranged upstream of the drafting device in the band direction of the fiber band. The fiber band width of the fiber band can be varied, for example, by means of the fiber band guide. The fiber band guide can have, for example, two helical surfaces that are opposite in direction and between which the fiber band is guided. When these spiral-shaped surfaces are twisted with respect to the fiber tape, the distance between the two surfaces changes. By twisting the two helical surfaces, the width of the fiber band can be adjusted.

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

According to a further advantageous embodiment, the web nozzle is adjusted under the influence of a force on at least one deflection roller which guides the fiber web. The deflection roller is subjected to a force during operation of the drafting device, so that the state of the web nozzle closest to the fiber band during operation of the drafting device is set during the force application of the deflection roller.

The invention also relates to a drafting device for a textile machine for twisting at least one fiber band. A fiber web nozzle for converging the fiber band is arranged on the output end of the drawing device. The drawing device can have, for example, a twisting zone for twisting the fiber band. The twisting zone may also have, for example, at least two roller pairs. The fibre 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 nozzle is selected and/or set according to one or more of the method features in the preceding and/or following description.

According to an advantageous embodiment, the orientation between the roller pair of the drawing frame and the fiber web nozzle is variable. The entry angle of the fiber band into the fiber web nozzle can be adjusted, for example, by changing the orientation. Furthermore, the roller pairs can be deflected, for example, in order to change the entry angle of the fiber band into the fiber web nozzle.

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

Additionally or alternatively, the position between the pair of draw unit rollers and the web nozzle can also be variable. By changing this position, the web nozzle can be moved relative to the roller pair. This makes it possible, for example, to adjust the fiber landing zone to the delivery opening. The web nozzles may be arranged, for example, on a rail on which they are movable. The web nozzle may also be movable by means of an actuator. By positioning the web nozzle relative to the roller pair, it is also possible to move the fiber landing zone until it is, for example, at least partially above the output opening.

The roller pairs include a pair of delivery rollers. In addition or alternatively, 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:

FIG. 1 is a side cross-sectional view of a drawing frame, a web nozzle and a fiber band,

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

Figure 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 frame 3, a web nozzle 1 and a schematic fiber band 2. The fiber band 2 can be twisted by means of the drafting device 3 and homogenized in the process. Thereby improving the quality of the fibre band 2. According to the present embodiment, the draft device 3 has a pair of delivery rollers 4 between which the fiber band 2 passes. The drawing frame 3 is only partially shown in the drawing, since it is also possible to have more roller pairs, which are not shown.

The drawing frame 3 also has deflection rollers 5 in order to deflect the fiber band 2 in the present exemplary embodiment toward the fiber web nozzle 1. The fiber band 2 leaves the drafting device 3 in a 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 frame 3, it reaches the fiber web nozzle 1, which can polymerize the stretched fiber band 2. The fibre web 2 passes through the fibre web nozzle 1, is compressed and leaves the fibre web nozzle 1 via the output opening 6 and the output 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 fibre band 2 has an approximately circular cross-section when it leaves the fibre web nozzle 1.

For the purpose of pressing, compressing or polymerizing the stretched fiber band 2, the fiber web nozzle 1 of the present embodiment has at least one nozzle ramp 9. The fleece nozzle 1 also has at least one step 10 for the purpose of polymerizing the fiber band 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 can be positioned and/or oriented relative to the fiber band 2 according to the band characteristics. The belt characteristic may be, for example, belt weight, belt material, belt width, belt density, and/or belt speed. The stretched fibre band 2 can be extruded, compressed or polymerised according to the band properties, whereby the fibre web nozzle 1 is adjusted according to the band properties, which is advantageous for the quality of the fibre band 2 discharged from the fibre web nozzle 1. The state of the fiber band 2 during polymerization may be correlated, for example, with the band speed at which the fiber band 2 enters the fiber web nozzle 1. The adjustment of the fibre web nozzle 1 in dependence of the belt speed improves the polymerization and thus the quality of the fibre belt 2 discharged from the fibre web nozzle 1.

For example, the fiber impact angle α at which the fiber ribbon 2 impacts the bottom surface 12 of the fiber web nozzle 1 may be adjusted, and thus, the fiber impact angle α is defined as the angle between the ribbon direction BR of the fiber ribbon 2 or fiber ribbon 2 and the bottom surface 12, and the fiber impact angle α may also be defined as the angle between the ribbon direction BR of the fiber ribbon 2 or fiber ribbon 2 and the cross-section of the fiber web nozzle 1 along its longitudinal direction.

The fibre impact angle α can be 70 ° to 80 °, the fibre impact angle α can also be 73 ° to 75 °, the situation when the fibre band 2 impacts the bottom surface 12 can be adjusted by means of this fibre impact angle α, which is in particular smaller than 90 °, according to the present embodiment the fibre landing zone Z is set such that it is at least partially arranged in or on the delivery opening 6, according to which at least a part, in particular an intermediate part, of the fibre band 2 flows directly into the delivery opening 6, furthermore, in the case of a fibre band flowing through the nozzle ramp 9, in particular through the step 10, the edge region of the fibre band 2 forms a fibre band vortex 11, by means of which the fibre band vortex 11 is prevented that the part of the fibre band 2 in-flowing uncontrollably hits the delivery opening 6, thus preventing a deterioration of the uniformity of the fibre band 2, whereafter the fibre band 2 flows towards the delivery opening 6 and into it is squeezed, compressed or polymerized during the fibre band 2 flowing towards the delivery opening 6.

The quality of the fiber web 2 discharged from the fiber web nozzle 1 can be improved by guiding the fiber web 2 to the discharge opening 6 by means of the fiber web vortex 11 without crossing the fiber portions of the fiber web 2, the fiber impingement angle α is preferably brought within the above-mentioned range for forming the fiber web vortex 11, the fiber web vortex 11 can be varied to find the highest quality of the fiber web 2 discharged from the fiber web nozzle 1 by means of, for example, varying the fiber impingement angle α during operation of the drawing device 3, i.e. during passage of the fiber web 2 through the fiber web nozzle 1, the fiber web nozzle 1 can be rotatably supported by means of not shown components for varying the fiber impingement angle α, so that the fiber web nozzle 1 is, for example, deflected.

Advantageously, the fibre web nozzle 1 can be adjusted such that the impact distance a between the fibre landing zone Z and the boundary wall 8 is 3mm to 8 mm. The impact distance a may also be 6 mm. The impact distance a between the fiber landing zone Z and the boundary wall 8 can be set such that the fiber band vortex 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 delivery opening 6. In this case at least a part of the fibre band 2 flows directly into the output opening 6. This improves the quality of the fiber web 2 discharged from the fiber 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 fiber band 2, in particular during operation of the drawing frame 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 boundary wall 8. Alternatively, the fiber web nozzle 1 can be set such that the fiber landing zone Z is on the side of the outlet opening 6 facing away from the boundary wall 8. According to the present embodiment, the web nozzle 1 is set such that the fiber landing zone Z is on the delivery opening 6.

The fiber web nozzle 1 is preferably designed such that the wall angle β between the dividing wall 8 and the cross section of the fiber web nozzle 1 in its longitudinal direction is 60 ° to 90 °, the wall angle β can also be 70 ° to 85 °, the wall angle β can also be 78 °, the wall angle β can also be defined between the dividing wall 8 and the base 12, the base 12 is here parallel to the cross section of the fiber web nozzle 1 in its longitudinal direction, according to the present exemplary embodiment the wall angle β of the dividing wall 8 and the base 12 is, for example, 90 °, in an alternative embodiment the wall angle β can be smaller than 90 °, for example 78 °, in which case the dividing wall 8 is inclined towards the base 12 and/or towards the outlet opening 6, the dividing wall 8 thus forms the shape of a suspension projection, it is possible for the suspension dividing wall 8 to prevent the fiber ribbon 2 from running up along the dividing wall 8 in the ribbon direction BR or towards the inlet side 14 (see fig. 2) of the fiber web nozzle 1, in which case the dividing wall 8 is in the form of a roof-like shape, and thus an improvement of the fiber ribbon is advantageously constructed such that the dividing wall 898 is larger than the fiber web nozzle 11, or the fiber ribbon 11.

In addition or alternatively, the fiber web nozzle 1 is preferably selected, wherein the distance between the boundary wall 8 and the outlet opening 6 is adjusted depending on the belt properties of the fiber belt 2. This makes it possible to adjust the extent of the space between the dividing wall 8 and the outlet opening 6 of the fiber band vortex 11.

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, whereby the deflection angle γ is adjusted. The fiber web nozzle 1 is preferably mounted so as to be pivotable in a pivot axis S. The impact distance a can be adjusted by means of the deflection of the web nozzle 1. Furthermore, the fiber landing zone Z can be moved by means of deflection of the fiber web nozzle 1 about the deflection axis S. For example, in the case of a fiber landing zone Z that is not located above the output opening 6, the fiber web nozzle 1 can be deflected, or the deflection angle γ can be adjusted in such a way that the fiber landing zone Z is arranged above the output opening 6.

According to a further advantageous variant, the deflection of the fleece nozzle 1 can be effected by means of an actuator, not shown in the figures, in order to automatically deflect the fleece 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, for abutment of the web nozzle 1 against these stops.

Fig. 2 shows a fiber web nozzle 1 with a stretched fiber band 2, which is polymerized into a strand-like fiber band 2 by the fiber web nozzle 1. The stretched fiber band 2 enters the fiber web nozzle 1 on its input side 14 and exits the fiber web nozzle 1 on its output side 15. The fiber band 2 also has a transverse direction QR, which is in particular perpendicular to the band direction BR. Fig. 2 is a front sectional view.

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

nozzle bevels

9a, 9b are arranged obliquely to the tape direction BR in order to guide the fibre tape 2 via the two

nozzle bevels

9a, 9b to the outlet opening 6.

In the present embodiment, the web nozzle 1 also has two

steps

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

step portions

10a, 10b are immediately adjacent to the

nozzle slopes

9a, 9 b. By means of the

steps

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

steps

10a, 10 b.

According to the present embodiment, the

nozzle slopes

9a, 9b have a slope distance AS. The bevel distance AS is the minimum distance between the two

nozzle bevels

9a, 9 b. These two

steps

10a, 10b are located next to the

respective nozzle bevels

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 fiber band 2 contact the

respective nozzle bevels

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

edge regions

13a, 13b contact the nozzle ramps 9a, 9 b. For example, a web nozzle 1 can be selected such that its bevel distance AS is less than 10mm, preferably 20mm, of the belt width BB. In this way, the

edge regions

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

It is also possible to select a certain type of web nozzle 1 such that the bandwidth BB is greater than the ramp distance AS by 20%, preferably 50%. Thus, the

edge regions

13a, 13b contact the

nozzle slopes

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

However, it is also possible to select a web nozzle 1 such that the ramp distance AS is greater than the belt width BB, so that the fiber web 2 does not touch the nozzle ramps 9a, 9 b. In this case, the fiber band 2 contacts only the bottom surface 12. This is advantageous for relatively narrow fibre tapes 2, the tape width BB of which has, for example, an extension of the outlet opening 6. The width BB of such a fiber 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 viewing direction in the figure is from the input side 14 towards the output side 15 of the fibre web nozzle 1. This viewing direction is also parallel to the tape direction BR. The fibre landing zone Z is at least partially arranged on the delivery opening 6. The delivery opening 6 at least partially intersects the fibre landing zone Z. For this purpose, the fiber web nozzle 1 is positioned and/or oriented relative to the fiber band 2 in such a way that the fiber landing zone Z is arranged in the region shown in fig. 3. Furthermore, the fiber landing zone Z is arranged centrally between the nozzle bevels 9a, 9 b.

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

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

List of reference numerals

1 fibre web nozzle

2 fiber band

3 drafting device

4 delivery roller pair

5 deflection roller

6 outlet

7 output channel

8 boundary wall

9 nozzle inclined plane

10 step part

11 fiber band vortex

12 bottom surface

13 edge area

14 input side

15 output side

Direction of BR band

Distance of impact A

Z-fiber landing zone

α fiber impact angle

β corner

Gamma deflection angle

BB bandwidth

AS distance of slope

QR transverse direction

DB nozzle Width

S deflection axis

Claims

1. A method for adjusting a fiber web nozzle (1) according to a stretched fiber band (2) arranged on an output end of a drafting device (3) of a textile machine,

it is characterized in that the preparation method is characterized in that,

-selecting the web nozzle (1) from a plurality of different web nozzles (1) in dependence of at least one belt property of the stretched fibre belt (2), and-adjusting the orientation and/or position of the web nozzle (1) relative to the fibre belt (2) in dependence of the belt property.

2. The method according to claim 1, characterized in that the nozzle width (DB) of the fibre web nozzle (1) is selected in dependence on the belt properties of the fibre belt (2).

3. The method according to one or more of the preceding claims, characterized in that the minimum ramp distance (AS) between two nozzle ramps (9a, 9b) which are at a distance from each other and which are arranged in the entry area of the fibre web nozzle (1) is selected in dependence on the belt properties of the fibre belt (2).

4. The method according to one or more of the preceding claims, characterized in that the web nozzle (1) is selected with a nozzle width (DB) that is larger than the bandwidth (BB) of the fiber band (2) and/or that the web nozzle (1) is selected with a minimum bevel distance (AS) between the nozzle bevels (9a, 9b) that is smaller than the bandwidth (BB) of the fiber band (2).

5. The method according to any one or more of the preceding claims, characterized in that the web nozzle (1) is selected with a minimum bevel distance (AS) between its nozzle bevels (9a, 9b) to such an extent that both edge areas (13a, 13b) of the fibre band (2) contact the two nozzle bevels (9a, 9b) with at least 5mm, preferably 10mm, upon initial impact with the web nozzle (1).

6. The method according to one or more of the preceding claims, characterized in that the web nozzle (1) is selected with a minimum bevel distance (AS) between its nozzle bevels (9a, 9b) to such an extent that both edge areas (13a, 13b) of the fibre band (2) contact the two nozzle bevels (9a, 9b) at least 10%, in particular 25%, of the band width (BB) upon initial impact with the web nozzle (1).

7. The method according to any one or more of the preceding claims, characterized in that the web nozzle (1) is selected with a wall angle (β) between its dividing wall (8) and a cross-section of the web nozzle (1) in the longitudinal direction of the web nozzle (1) of 60 ° to 90 °, in particular 70 ° to 85 °, preferably 78 °.

8. The method according to any one or more of the preceding claims, characterized in that the fibre web nozzle (1) is adjusted in relation to the fibre band (2) such that the fibre impingement angle (α) between the band direction (BR) of the fibre band (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 °, in particular 73 ° to 75 °.

9. A method according to any one or more of the preceding claims, characterised in that the fibre web nozzle (1) is adjusted in relation to the fibre band (2) so that the impact distance (A) of the fibre band (2) with the dividing wall (8) is 3-8 mm, preferably 6 mm.

10. The method according to one or more of the preceding claims, characterized in that the deflection angle (γ) of the web nozzle (1) is adjusted according to the belt properties.

11. The method according to one or more of the preceding claims, characterized in that the nozzle width (DB), the ramp distance (AS) between the nozzle ramps (9a, 9b), the orientation and/or the position of the web nozzle (1) relative to the fibre band (2) are determined by means of a graph.

12. The method according to one or more of the preceding claims, characterized in that the position of a fiber band guiding device arranged upstream of the drafting device (3) is adjusted depending on the band properties and/or the selected web nozzle (1).

13. The method according to one or more of the preceding claims, characterized in that the web nozzle (1) is adjusted before and/or during operation of the drafting device (3) and/or in that the web nozzle (1) is adjusted in the event of a force being applied to at least one deflection roller (5) guiding the fiber band (2).

14. A drafting device (3) of a textile machine for twisting at least one fiber band (2), having a fiber web nozzle (1) for converging the fiber band (2) arranged on the output of the drafting device (3),

it is characterized in that the preparation method is characterized in that,

the web nozzle (1) is selected and/or adjusted according to the method of any one or more of the preceding claims.

15. Drafting device according to the preceding claim, characterised in that the orientation and/or position between the pair of rollers (4) of the drafting device (3) and the fibre web nozzle (1) is variable.