EP3054039B1 - Non-woven funnel for compressing a non-woven fibre - Google Patents

Description

The present invention relates to a fleece funnel for compacting a fiber fleece, in particular on a draw frame, card or combing machine, with an elongated input side on which the spread out fiber fleece enters the fleece funnel and an output side on which the fiber fleece again as a sliver from the fleece funnel exit. The fleece funnel furthermore has an exit opening which is arranged on the exit side. In addition, the fleece funnel has at least one guide surface for the fiber fleece, which is arranged between the inlet side and the outlet side, in order to guide the fiber fleece flowing into the fleece funnel in the direction of the outlet opening.

From the CH 359073 A a sliver funnel for solidifying a sliver entering the funnel in spinning machines is known. The funnel that feeds the solidified sliver to a spinning can is stepped at least once on the inside between a conical and a cylindrical part. This causes the sliver produced to be twisted. The disadvantage here is that at high speeds of the sliver the edge fibers are pushed over the conical part and meet in an uncontrolled manner in the center in the area of the cylindrical part. As a result, thick spots in the sliver and fibers folded in a Z-shape can be formed. This has a negative effect on a subsequent processing of the sliver. This funnel is not suitable for compressing a fiber fleece into a sliver, if only because of its rotationally symmetrical and narrow inlet cross-section. In contrast to the already compact fibers of a fiber band, the fibers present in a relatively loose fiber fleece would be combined in an uncontrolled and chaotic manner. Twisting of the sliver produced is also undesirable.

In the DE 196 18 642 A1 a generic fleece funnel is disclosed.

From the U.S. 1,499,607 A an apparatus for treating fibers is known. The device comprises two laterally arranged guide elements which guide the fibers to an exit opening.

From the DE 10 2006 012 335 A1 a web guiding device is known for arranging at the outlet of a device delivering a spread out fiber web. The fleece guide device comprises a fleece funnel for combining the supplied fiber fleece to form a sliver, which has a funnel area and a nozzle channel adjoining it downstream.

From the EP 0 332 168 A1 a device for compressing a textile sliver is known. The device comprises a transport channel and an insertion mouthpiece which adjoins the transport channel and which has a mouthpiece channel which is aligned with the transport channel and tapers in the direction of flow.

From the US 1 102 298 A a device for combining a sliver is known which has two lateral guide elements for the sliver and an exit opening through which the sliver can leave the device.

From the JP H05 37978 U a fleece funnel is known which has a guide surface for gathering an incoming fiber sliver, wherein the fiber sliver can leave the fleece funnel through an exit opening.

The object of the present invention is thus to create a fleece funnel with which a fiber fleece can be passed through the fleece funnel at high speed, so that a high quality of the sliver emerging from the fleece funnel is achieved.

The object is achieved by a fleece funnel for compacting a fiber fleece with the features of independent claim 1.

A fleece funnel is proposed for compacting a fiber fleece, in particular on a draw frame, carding machine or combing machine, which has an elongated input side on which the spread out fiber fleece enters the fleece funnel and an outlet side on which the fiber fleece emerges from the fleece funnel as a sliver. An outlet opening is arranged on the outlet side. The compacted sliver exits the fleece funnel through this.

Furthermore, the fleece funnel has at least one guide surface for the fiber fleece, which is arranged between the inlet side and the outlet side, in order to guide the fiber fleece flowing into the fleece funnel in the direction of the outlet opening. The inflowing fiber fleece hits the guide surface and is deflected in the direction of the outlet opening. By means of the guide surface, the fiber fleece is compressed to form a fiber band.

In addition, the fleece funnel has a step between the guide surface and the outlet opening. As a result of the gradation, the part of the fiber fleece coming from the guide surface in the direction of the outlet opening is given a twist which acts perpendicular to the direction of movement of the fiber fleece. As a result, from the viewing direction of the movement of the fiber fleece, a vortex is formed which begins in the area of the gradation and runs into the outlet opening. The fiber fleece is thus guided in the direction of the outlet opening with less turbulence. In particular, the vortex reduces the acceleration forces acting on the fiber fleece. The swirl does not lead the fiber fleece into the outlet opening abruptly in a 90 ° bend. As a result, at high speeds of the fiber fleece, the number of Thick spots or the Z-shaped folded fibers are reduced. The sliver quality of the compressed sliver is increased.

According to the invention, the fleece funnel has at least one intermediate surface between the gradation and the exit opening. The fiber fleece coming from the direction of the input side hits the intermediate surface approximately perpendicularly. As a result of such an impact of the fiber fleece in this area, not all of the individual fibers of the fiber fleece are parallel, in particular some of the individual fibers cross one another. This increases the connection between the individual fibers arranged in this way, which increases the sliver adhesion of the fiber sliver. The compressed fiber sliver thus has sufficient sliver adhesion after exiting the exit opening of the fleece funnel. The sliver quality of the compressed sliver is increased.

The vortex formed by the gradation also moves over the at least one intermediate surface. The interface also serves as an area in which an arc of the vertebra can expand.

In addition, it is advantageous if the fleece funnel is formed by an essentially cuboid base body which has a longitudinal extent in the x direction and a transverse extent perpendicular thereto in the y direction, each of which is perpendicular to the intended direction of movement of the fiber fleece. The base body also has a height extent extending in the direction of movement of the fiber fleece in the z-direction. The longitudinal extent in the x-direction is greater than the transverse extent in the y-direction. The fleece funnel is thus elongated and thus adapted to a flat shape of the fiber fleece. In particular, the fiber fleece has a width which is several times greater than the thickness. It is therefore sufficient if the transverse dimension of the fleece funnel is also less than its longitudinal dimension. This enables easier assembly and accessibility of the fleece funnel in the machine. It is particularly advantageous if the intermediate surface is arched. After grading, the fibers of the fiber fleece hit the intermediate surface and are gently guided towards the exit opening by the curvature. This has excellent effects on the desired position of the individual fibers in the fiber fleece or the fiber band.

In addition, it is provided according to the invention that the fleece funnel has two gradations spaced apart in the x direction and separated from one another. In general, a flat fiber fleece is compressed essentially in its width by the fleece funnel. This means that the individual fibers of the fiber fleece are guided in the x-direction to the center of the fiber fleece. The thickness of the fiber fleece changes significantly less than its width, so there is only a slight movement of the individual fibers in the y-direction. It is therefore sufficient if the fleece funnel has two guide surfaces and / or gradations spaced apart in the x direction.

Another advantage is when the guide surface is designed to be widened in the z direction, in particular trapezoidal. This saves additional material and weight. Since the vortex generated by the gradation expands in the y-direction, this vortex is also guided with a widened guide surface. This prevents the vortex from slipping out of the fleece funnel over the widened guide surface.

If the guide surface is flat, this also has advantages. A flat guide surface is easy to manufacture. For example, milling a flat guide surface saves time, which in turn leads to cost savings.

In addition, it is advantageous if the outlet opening is arranged in the center of the at least one guide surface and / or in the center of the at least one step is. Due to the central arrangement of the outlet opening, there is an equal distance from the guide surface and / or the gradation on each side in the direction of the outlet opening. The fiber fleece therefore runs from each side at the same speed into the exit opening. A speed difference would lead to a compression and stretching of the nonwoven fabric on opposite sides of the exit opening. This in turn leads to denser and thinner areas in the compacted sliver. The central arrangement of the exit opening improves the quality of the sliver.

It is also advantageous if the gradations are straight and / or are arranged parallel to one another. The straightness is particularly easy to produce by means of a milling process, for example. If the gradations are arranged parallel to one another, the fiber fleece is deflected equally strongly at the gradations in the same direction. The vortex formation is the same for every gradation. The fiber fleece runs evenly into the exit opening and thus improves the quality of the sliver.

It is particularly advantageous if a plurality of gradations are arranged between the at least one guide surface and the outlet opening and if at least one further, in particular arched, intermediate surface is preferably arranged between each two gradations. The vortex formation of the fiber fleece between the guide surface and the outlet opening is increased by several gradations. The fiber fleece runs even more homogeneously into the exit opening and thus out of the fleece funnel. A further curved intermediate surface between each two gradations increases the tape adhesion.

It is also advantageous if the at least one guide surface has an angle of 20 ° to 70 °, in particular 30 ° to 50 °, in particular 39 °, to the x direction. A higher angle leads to a steeper guide surface. This means that the fiber fleece becomes less when it hits the guide surface strongly directed towards the exit opening. This is advantageous at high speeds of the fiber fleece, since with the steeper guide surface the fiber fleece is guided more gently in the direction of the exit opening. A smaller angle can be advantageous if the fiber fleece is to be guided to the exit opening quickly, ie over a smaller distance in the z-direction. A smaller angle therefore saves the fleece funnel from increasing in height, which in turn saves installation space in the machine and costs.

It is an advantageous further development when the intermediate surface and / or the guide surface are designed to be concave and / or convex in the x and / or Y direction. The movement of the fiber fleece via the intermediate surface and / or the guide surface can thus be influenced. For example, a concave design of the guide surface in the y-direction is advantageous in that it also guides the fiber fleece in the y-direction of the fleece funnel. The fiber fleece is then guided in the valley of the guide surface, which is concave in the y-direction.

In addition, it is advantageous if the gradation in the z-direction has a height in the range from 2 mm to 10 mm, preferably in the range from 3 mm to 7 mm. A higher gradation can also further increase the vortex formation of a gradation. This can lead to an increased quality of the sliver.

In addition, it is advantageous if a transition from the gradation to the respective intermediate surface has a radius. The radius can have a value of 3 mm to 12 mm, for example. This radius advantageously has a value of 6 mm. As a result, the fiber fleece slides more homogeneously over the gradation. This increases the quality of the sliver.

Furthermore, it is advantageous if the greatest distance between two assigned gradations in the x direction is 50% to 80%, in particular 60% to 75%

Width of the fiber fleece to be bundled on the input side of the fleece funnel corresponds. For example, with the greatest distance between two assigned gradations in the x direction of 80% of the width of the fiber fleece to be bundled on the inlet side of the fleece funnel, 10% of the edge fibers of the two edges of the fiber fleece hit the guide surface and slide over the gradation. This means that only the outer 10% of the fiber fleece each receive a twist and create a vortex. An adaptation of the width of the two assigned gradations to the speed of the fiber fleece thus leads to a constant sliver quality.

If the intermediate surface and / or the guide surface has a smooth or a structured surface, this also has advantages. A smooth surface is easier to clean. A structured surface can, for example, be coated with a chrome layer in a coating process. The chrome layer can have spherical elevations which form an air cushion when the fiber fleece slides over the chrome layer. This reduces frictional resistance and the sliver is gently guided to the exit opening. The structured surface can also be formed by painting or mechanical processing.

Furthermore, it is advantageous if the fleece funnel is delimited in the y-direction on at least one side by a cover. The inside of the fleece funnel and in particular the fiber fleece are protected from dirt by means of the cover. In addition, the cover can also guide the fiber fleece in order to hold it in the fleece funnel in the y-direction.

In addition, an exit opening which has a round cross section with a diameter of 10 mm to 30 mm, in particular 15 mm to 25 mm, is advantageous. A round cross-section is easy to produce, for example by means of a bore. In addition, by means of the diameter, the degree of Compaction of the compressed sliver can be influenced. A separate component can also be used as a fleece nozzle in the outlet opening.

It is also advantageous if the outlet opening is arranged in a base plate as part of the base body and the base plate has a thickness of 5 mm to 12 mm, in particular 6 mm to 10 mm. This simplifies the production process and thus saves time and money.

It is also advantageous if a fleece guide insert is arranged after the exit opening in the direction of movement of the fiber fleece. The fleece guide insert guides the sliver emerging from the fleece funnel to the exit opening. The fleece guide insert can be designed as a fleece guide tube, so that the fleece guide insert has the shape of a tube. The fleece guide insert can, for example, have a round, elliptical and / or angular cross section. In addition, the fleece guide insert can have the same cross section as the outlet opening. However, the cross section can also be smaller or larger. Through the fleece guide insert, the emerging sliver is still guided a certain length after the fleece funnel. In particular, the fleece guide insert prevents the sliver from diverging after the exit opening. For example, with the fleece guide insert, the fiber sliver can be guided to a subsequent processing device for the fiber sliver, in particular a turntable for storing the fiber sliver in a can. As a result, a cross-section of the sliver can also be checked after the fleece funnel. The quality of the sliver can thus be increased.

It is advantageous if the fleece funnel in the y-direction 40 mm to 70 mm, in particular 45 mm to 60 mm, in the x-direction 120 mm to 160 mm, in particular from 130 mm to 150 mm, and / or in the z-direction 30 mm to 80 mm, in particular 40 mm to 70 mm, measures. As a result, the fleece funnel can be adapted to the width of the fiber fleece.

If the curved intermediate surface has a radius of 100 mm to 200 mm, in particular from 125 mm to 175 mm, this also has advantages. A larger radius is associated with a flatter slope of the interface. The fiber fleece meets the intermediate surface here approximately perpendicularly. This means that the individual fibers cross each other on impact and are not too parallel to one another. This increases tape adhesion between the individual fibers. A smaller radius, on the other hand, directs the fiber fleece in the region of the intermediate surface more homogeneously to the exit opening.

Furthermore, it is advantageous if the curved intermediate surface has an extension in the x-direction of the fleece funnel of 30 mm to 100 mm, in particular from 50 mm to 80 mm. As already described above, the interface has an influence on the tape adhesion. When the fiber fleece meets the intermediate surface almost perpendicularly, a higher proportion of the individual fibers in the fiber band are crossed, i.e. they are hooked into one another. This increases the adhesion of the tape. With a wider intermediate surface, correspondingly more individual fibers of the fiber fleece hit the intermediate surface and thus more individual fibers become entangled. The tape adhesion can be influenced by the width of the intermediate surface.

It is also advantageous if the curved intermediate surface and the concave guide surface have the same radius with a common center point. The curved intermediate surface and the concave guide surface are thus both part of a common circular arc, interrupted by a gradation. As a result, the fiber fleece can be routed homogeneously from the guide surface to the intermediate surface.

Figur 1

eine Schnittansicht eines Vliestrichters mit zwei Leitflächen, zwei Abstufungen und einer Zwischenfläche,

Figur 2

eine Schnittansicht eines Vliestrichters mit zwei Leitflächen und einer Zwischenflächen, und mit zwischen jeweils einer Leitfläche und Ausgangsöffnung zwei Abstufungen,

Figur 3

eine Schnittansicht eines Vliestrichters mit zwei Leitflächen und zwischen jeweils einer Leitfläche und der Ausgangsöffnung zwei Abstufungen und mehreren Zwischenflächen,

Figur 4

eine Draufsicht eines Vliestrichters mit zwei trapezförmigen Leitflächen, zwei Abstufungen, einer Zwischenfläche und einer Ausgangsöffnung,

Figur 5

eine Draufsicht eines nicht erfindungsgemäßenen Vliestrichters mit einer Leitfläche, einer Abstufung, einer Zwischenfläche und einer Ausgangsöffnung,

Figur 6

eine Schnittansicht eines Vliestrichters mit einem Radius zwischen der Abstufung und der Zwischenfläche und

Figur 7

eine Schnittansicht eines Vliestrichters mit einem Vliesführungseinsatz.

Further advantages of the invention are described in the following exemplary embodiments. It shows:

Figure 1

a sectional view of a fleece funnel with two guide surfaces, two gradations and an intermediate surface,

Figure 2

a sectional view of a fleece funnel with two guide surfaces and an intermediate surface, and with two gradations between each guide surface and outlet opening,

Figure 3

a sectional view of a fleece funnel with two guide surfaces and two gradations and several intermediate surfaces between each guide surface and the outlet opening,

Figure 4

a top view of a fleece funnel with two trapezoidal guide surfaces, two gradations, an intermediate surface and an exit opening,

Figure 5

a plan view of a non-woven funnel not according to the invention with a guide surface, a step, an intermediate surface and an outlet opening,

Figure 6

a sectional view of a fleece funnel with a radius between the gradation and the intermediate surface and

Figure 7

a sectional view of a fleece funnel with a fleece guide insert.

In Figure 1 a sectional view of a fleece funnel 1 with two guide surfaces 5a, 5b and two gradations 6a, 6b and an intermediate surface 7a is shown. Parts of the fleece funnel 1 are formed from a base body 8. In addition, the fleece funnel 1 has an inlet side 2, on which a fiber fleece enters, and an outlet side 3, on which the compressed sliver emerges. An outlet opening 4 is arranged on the outlet side 3. By the compacted sliver emerges from the fleece funnel 1 through the exit opening 4. In this exemplary embodiment, the outlet opening 4 is arranged in a base plate 17 which adjoins the base body 8. Here, the base plate 17 and base body 8 form the fleece funnel 1. The base body 8 has a longitudinal extent 12 which is directed in the x direction. Furthermore, the base body 8 has a height extension 14 which is directed in the z direction. In an alternative embodiment, the base plate 17 and the base body 8 can be formed in one piece.

Two guide surfaces 5a, 5b are arranged between the input side 2 and the output side 3. A fiber fleece (not shown) coming from the z-direction meets the respective guide surface 5a, 5b with the edge fibers of the fiber fleece and deflects it in the direction of the outlet opening 4. It is advantageous if the fiber fleece enters the inlet side 2 in a centered manner and thus also enters the outlet opening 4 in a centered manner. As a result, the fiber fleece is guided uniformly from the guide surface 5a and from the guide surface 5b in the direction of the outlet opening 4. The guide surfaces 5a, 5b have an angle α to the x direction. This is the same for both guide surfaces 5a, 5b, which is why only one guide surface 5b has been identified with an angle and reference number. Alternatively, the angles α of the guide surface 5a and the guide surface 5b can be different. If, for example, a fiber fleece enters the fleece funnel 1 at an angle, this can be compensated for by means of two different angles α.

A step 6a is arranged between the guide surface 5a and the outlet opening 4, and a step 6b is arranged between the guide surface 5b and the outlet opening 4. The fiber fleece flows over the gradation 6a, 6b. The fiber fleece is set in rotation so that a vortex is formed which begins in the area of the gradation 6a, 6b and runs into the outlet opening 4 in an arc. The eddy that comes from the step 6a flows in the x-direction into the outlet opening 4. The eddy that comes from the step 6b flows into the outlet opening in the opposite direction to the x-direction 4. The two eddies do not influence each other. Both vertebrae make an arc in the y-direction (cf. Figure 4 ). Accordingly, according to the gradation 6a, 6b, they evade in the y-direction in order to enter the exit opening 4 after an arc. This vortex formation is also carried out at increased speeds of the fiber fleece, so that the fiber fleece is compacted in a controlled manner even at these speeds. This increases the quality of the sliver.

The gradations 6a, 6b have a height 15a and 15b, which is directed in the z-direction.

The gradation 6a and the gradation 6b are arranged on the same level in the z-direction. The two gradations 6a, 6b are therefore assigned to one another.

A curved intermediate surface 7a is arranged between the steps 6a, 6b and the outlet opening 4. The intermediate surface 7a encloses the outlet opening 4. The two eddies that come from the guide surfaces 6a, 6b also flow over the intermediate surface 7a. Coming from the z-direction, the fiber fleece hits the intermediate surface 7a approximately perpendicularly. After the fiber fleece hits, the proportion of individual fibers crossing one another is higher than before it hit. This has the result that the tape adhesion within the compressed fiber tape is increased after exiting the exit opening 4.

Figure 2 shows the sectional view of an alternative embodiment of a fleece funnel 1 with two guide surfaces 5a, 5b, an intermediate surface 7a and with two steps 6a-6d arranged between each guide surface 5a, 5b and the outlet opening 4. In addition, in this exemplary embodiment, the outlet opening 4 is alternatively formed in the base body 8.

Two steps 6a, 6c are arranged between the guide surface 5a and the outlet opening 4. A fiber fleece entering the fleece funnel 1 through the inlet side 2 is guided by the guide surface 5a in the direction of the outlet opening 4. The edge fibers of the fiber fleece slide over the first gradation 6a with the height 15a. The edge fibers of the fiber fleece then slide over the second step 6c with the height 15c, where they are passed on to the exit opening via the intermediate surface 7a.

The edge fibers of the fiber fleece, which are guided through the guide surface 5b in the direction of the exit opening, first slide over the step 6b with the height 15b. The edge fibers then slide over the second gradation 6d with the height 15d. These edge fibers of the fiber fleece are also guided into the outlet opening 4 via the intermediate surface 7a. The eddy formation described above is intensified by the gradations 6a-6d between the guide surfaces 5a, 5b and the outlet opening 4.

In Figure 3 is a sectional view of a further alternative example of a fleece funnel 1 with two guide surfaces 5a, 5b and between each of a guide surface 5a, 5b and the outlet opening 4 two gradations 6a-6d and several intermediate surfaces 7a-7c. The edge fibers of a fiber fleece first hit the guide surfaces 5a, 5b and are guided in the direction of the outlet opening 4. The fibers of the fiber fleece first slide over the gradations 6a, 6b with the height 15a, 15b in the z-direction. The fiber fleece is then passed over the intermediate surfaces 7b, 7c to the gradations 6c, 6d. The fiber fleece slides over the steps 6c, 6d to the intermediate surface 7a and finally to the exit opening 4. The step 6a is assigned to the step 6b and the step 6c to the step 6d, since these pairs are arranged on the same level in the z-direction are. These two pairs of gradations 6a-6d increase the above-described vortex formation of the edge fibers of the fiber fleece in the fleece funnel 1. As a result, the fiber tape quality is improved at high speed of the fiber fleece to be compressed. Increase the intermediate surfaces 7a-7c the proportion of individual fibers in the fiber fleece which cross each other after an approximately vertical impact of the fiber fleece on the intermediate surfaces 7a-7c, whereby the tape adhesion is increased.

Figure 4 shows a top view of a further alternative example of a fleece funnel 1 with two trapezoidal guide surfaces 5a, 5b, two gradations 6a, 6b, an intermediate surface 7a and an outlet opening 4. The fleece funnel 1 is formed by the base body 8, which has a transverse extension 13 in the y-direction . The fleece funnel 1 is closed on one side by means of a cover 18. The two guide surfaces 5a, 5b are trapezoidal so that they widen in the direction of the outlet opening 4.

A fiber fleece entering the fleece funnel 1 is guided on the guide surfaces 5a, 5b in the direction of the outlet opening 4. In the area of the gradations 6a, 6b, the edge fibers are given a twist so that a vortex is formed. The vortex is formed by each guide surface 5a, 5b in such a way that it performs an arc in the opposite y-direction. The fiber fleece enters the fleece funnel 1 next to the cover 18, hits the guide surfaces 5a, 5b, and then slides over the gradations 6a, 6b. In the process, the vortex is formed, which moves away from the cover 18 in the area between the gradations 6a, 6b and the outlet opening. As a result of the rotation of the vortex, the fiber fleece leads into the exit opening 4. By means of the intermediate surface 7a, the tape adhesion of the fiber tape is increased.

Figure 5 shows a plan view of a fleece funnel 1 not according to the invention with a guide surface 5e, a step 6e, an intermediate surface 7d and an outlet opening 4 as a further alternative example. The outlet opening 4 is arranged centrally to the intermediate surface 7d. The single step 6e adjoins the intermediate surface 7d, the outlet opening 4 being arranged in the center of the oval formed by the step 6e. The step 6e is followed by the single guide surface 5e, which is also the outlet opening 4 as the center point having. The guide surface 5e is designed to be concave here, in particular on the side regions spaced apart in the x direction. This is advantageous in that a nonwoven fabric which is not aligned exactly in the x direction is also passed through the concave guide surface 5e in the direction of the outlet opening 4. A fiber fleece cannot run past the exit opening 4 in this way.

Figure 6 shows a further alternative embodiment of a fleece funnel 1. In this case, the fleece funnel 1 has a radius 9a at the transition from the gradation 6a to the intermediate surface 7a. A radius 9b is also arranged after the gradation 6b. The radii 9a, 9b can have a value between 3 mm and 12 mm, for example. However, it is particularly advantageous if the value of the radii is 6 mm. With the radii 9a, 9b, the fiber fleece, when it slides over the gradations 6a, 6b, can be passed over them particularly homogeneously. This increases the quality of the sliver.

Figure 7 shows an additional alternative embodiment of a fleece funnel 1 with a fleece guide insert 10. The fleece guide insert 10 is arranged after the outlet opening 4 in the direction of movement of the fiber fleece. In particular, the fleece guide insert 10 can connect to the outlet opening 4, so that the emerging sliver is guided on by the fleece guide insert 10 following the outlet opening 4. The fleece guide insert 10 can, for example, have the shape of a tube, so that a fleece guide tube is formed. The fleece guide insert 10 can preferably have the same cross section as the outlet opening 4. Alternatively, the cross section could also be larger or smaller. The fleece guide insert 10 can also have a round, elliptical and / or angular cross section. The shape of the cross section can, however, also be adapted to the shape of the outlet opening 4. Alternatively, the cross section of the outlet opening 4 can also be adapted to the cross section of the fleece guide insert 10. The fleece guide insert 10 can also have a cross-section that tapers in the direction of movement of the fiber fleece, so that the emerging fiber band is compressed again by the fleece guide insert 10. With the fleece guide insert 10, the sliver can be guided further after exiting the exit opening 4, so that it can be guided in a controlled manner to a downstream processing device for the sliver.

The present invention is not limited to the illustrated and described exemplary embodiments. Modifications within the scope of the claims are also possible.

List of reference symbols

1.

Fleece funnel

2.

Entry page

3.

Exit page

4th

Exit opening

5.

Guide surface

6th

gradation

7th

Interface

8th.

Base body

9.

radius

10.

Fleece guide insert

12th

Longitudinal expansion

13th

Transverse expansion

14th

Height expansion

15th

Level of gradation

17th

Base plate

18th

cover

α

Angle of the guide surface

Claims (15)

1. A web funnel for compacting a fiber web, particularly on a draw frame, carding machine, or comber, having an elongated inlet side (2) at which the expanded fiber web enters the web funnel (1), and an outlet side (3) at which the fiber web exits the web funnel (1) as a fiber bundle, having an outlet opening (4) disposed on the outlet side (3) and having at least one guide surface (5a, 5b, 5c, 5d) for the fiber web disposed between the inlet side (2) and the outlet side (3) in order to guide the fiber web flowing into the web funnel (1) in the direction of the outlet opening (4) and wherein the web funnel is implemented as a base body (8), having a longitudinal extent (12) in the X-direction and having a height extent (14) in the Z-direction,
   characterized in that,
   two steps (6a, 6b, 6c, 6d, 6e) spaced apart in the x-direction and separated from one another are disposed between the guide surface (5a, 5b, 5c, 5d) and the outlet opening (4) wherein these two steps (6a, 6b, 6c, 6d) being arranged at the same level in the z-direction in the direction from the outlet side (3) to the inlet side (2) above the outlet opening (4), and that at least one intermediate surface (7a, 7b, 7c) is disposed between the steps (6a, 6b, 6c, 6d) and the outlet opening (4), so that by means of the steps (6a, 6b, 6c, 6d) the fiber web flowing to the outlet opening (4) forms a vortex oriented perpendicular to the direction of motion of the fiber web, which vortex moves over the intermediate surface (7a, 7b, 7c) to the outlet opening (4) .
2. The web funnel according to the preceding claim, characterized in that , the base body (8) is implemented as a substantially cuboid base body (8), having the longitudinal extent (12) in the X-direction and a transverse extent (13) perpendicular thereto in the Y-direction, each oriented perpendicular to the planned direction of motion of the fiber web, and having the height extent (14) in the Z-direction extending in the direction of motion of the fiber web, and wherein the longitudinal extent (12) in the X-direction is greater than the transverse extent (13) in the Y-direction.
3. The web funnel according to any one or more of the preceding claims, characterized in that the intermediate surface (7a, 7b, 7c,) is curved and/or comprises a radius from 100 mm to 200 mm, particularly from 125 mm to 175 mm and/or comprises an extent in the X-direction of the web funnel (1) from 30 mm to 100 mm, particularly from 50 mm to 80 mm..
4. The web funnel according to any one or more of the preceding claims, characterized in that the web funnel (1) comprises two guide surfaces (5a, 5b, 5c, 5d) spaced apart in the X-direction.
5. The web funnel according to any one or more of the preceding claims, characterized in that the guide surfaces (5a, 5b, 5c, 5d) expand in the Z-direction, particularly having a trapezoidal shape, und/or are level.
6. The web funnel according to any one or more of the preceding claims, characterized in that the outlet opening (4) is disposed centered relative to the at least one guide surface (5a, 5b, 5c, 5d) and/or centered relative to the at least one step (6a, 6b, 6c, 6d).
7. The web funnel according to any one or more of the preceding claims, characterized in that the steps (6a, 6b, 6c, 6d) are disposed in a straight line and/or parallel to each other and/or that the step (6a, 6b, 6c, 6d) comprises a height (15) in the Z-direction in the range of 2 mm to 10 mm, preferably in the range of 3 mm to 7 mm.
8. The web funnel according to any one or more of the preceding claims, characterized in that a plurality of steps (6a, 6b, 6c, 6d) are disposed between the at least one guide surface (5a, 5b, 5c, 5d) and the outlet opening (4) and preferably at least one further, particularly curved intermediate surface (7a, 7b, 7c) is disposed between two steps (6a, 6b, 6c, 6d) in each case.
9. The web funnel according to any one or more of the preceding claims, characterized in that the at least one guide surface (5a, 5b, 5c, 5d) comprises an angle to the X-direction from 20° to 70°, particularly from 30° to 50°, preferably 39°.
10. The web funnel according to any one or more of the preceding claims, characterized in that the intermediate surface (7a, 7b, 7c) and/or the guide surface (5a, 5b, 5c, 5d) is concave and/or convex in the X-direction and/or Y-direction.
11. The web funnel according to any one or more of the preceding claims, characterized in that a transition from the step (6a, 6b, 6c, 6d) to the corresponding intermediate surface (7a, 7b, 7c) comprises a radius (9a, 9b).
12. The web funnel according to any one or more of the preceding claims, characterized in that the intermediate surface (7a, 7b, 7c) and/or the guide surface (5a, 5b, 5c, 5d) comprises a smooth or a textured surface.
13. The web funnel according to any one or more of the preceding claims, characterized in that the outlet opening (4) comprises a round cross section having a diameter from 10 mm to 30 mm, particularly from 15 mm to 25 mm and/or that the outlet opening (4) is disposed in a base plate (17) as part of the base body (8) and the base plate (17) has a thickness from 5 mm to 12 mm, particularly from 6 mm to 10 mm..
14. The web funnel according to any one or more of the preceding claims, characterized in that a web guide insert (10), particularly a web guide tube, is disposed downstream of the outlet opening (4) in the direction of motion of the fiber web, said insert guiding the fiber bundle exiting the web funnel (1) downstream of the outlet opening (4).
15. The web funnel according to claims 3 and 10, characterized in that the curved intermediate surface (7a, 7b, 7c) and the concave guide surface (5a, 5b, 5c, 5d) have the same radius and a common center point.

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