CN111850747A

CN111850747A - Spinning station, rotor spinning machine and yarn manufacturing method

Info

Publication number: CN111850747A
Application number: CN202010349034.7A
Authority: CN
Inventors: K·冈瑟; C·赛沙伊尔
Original assignee: Zhuolang Intelligent Technology Co Ltd
Current assignee: Zhuolang Intelligent Technology Co Ltd
Priority date: 2019-04-29
Filing date: 2020-04-28
Publication date: 2020-10-30
Also published as: EP3733939A1; DE102019111035A1; MX2020004276A; US20200340147A1; JP2020183608A; BR102020008419A2

Abstract

The invention relates to a spinning station, a rotor spinning machine and a yarn manufacturing method. The spinning station for producing a yarn from a supplied sliver has an air spinning nozzle with an inlet for the supplied sliver and an outlet zone with an outlet for the air spun yarn. In order to provide a spinning station, a rotor spinning machine and a method which allow advantageous modification of the surface properties of the yarn without simultaneously impairing the yarn properties and at the same time avoiding expensive and complicated modifications of the spinning station, a withdrawal nozzle is provided in the outlet region after the outlet for modifying the surface properties of the spun yarn.

Description

Spinning station, rotor spinning machine and yarn manufacturing method

Technical Field

The invention relates to a spinning station and a rotor spinning machine for producing a yarn from a supplied fiber sliver, comprising a rotor spinning nozzle having an inlet for the supplied fiber sliver and an outlet region having an outlet for the rotor spun yarn. The invention also relates to a method for manufacturing a yarn with modified (modification) surface properties. Finally, the invention relates to the use of an unwinding nozzle in the outlet region of an air spinning nozzle of a spinning station for modifying the surface properties of an air spun yarn.

Background

Various designs of spinning stations and air-flow spinning machines are known from the prior art and are also machines which are used to produce yarns from fibrous material, in particular from fiber slivers fed to spinning stations, in addition to rotor spinning machines.

In open-end spinning, a sliver or fiber sliver is generally drawn by a drawing device comprising a plurality of roller pairs according to the fineness of the yarn to be obtained and fed to an open-end spinning nozzle. In an air spinning nozzle, a portion of the feed fibers is wrapped around a parallel fiber core by a rotating flow. This results in a special yarn structure of the air yarn, which consists of parallel yarn cores and wrapping fibers attached at a defined angle, the wrapping fibers contributing to the yarn strength. Air-spun yarns generally have a low hairiness level because no mechanical contact points occur during fiber twisting.

A low hairiness can adversely affect the textile or knitted fabric after further processing, because, for example, a harsh touch is present. The content of protruding fibres is generally influenced by variations in the supply of compressed air for regulating the spinning pressure and/or variations in the spinning speed. However, other properties of the air-spun yarn are also adversely affected when the spinning pressure and/or the spinning speed are changed, with the result that, although the hairiness level is improved, this can only be achieved at the same time with a general impairment of the yarn properties, such as yarn stability.

Disclosure of Invention

The invention is therefore based on the object of providing a spinning station, a rotor spinning machine and a yarn production method which allow advantageous modification of the surface properties of the yarn without impairing the yarn properties, while avoiding expensive and complicated modifications of the spinning station.

According to the invention, this object is achieved by a spinning station, a rotor spinning machine, a method and a suction nozzle.

The spinning station according to the invention for producing a yarn from a supplied sliver has an air spinning nozzle with an inlet for the supplied sliver and with an outlet zone for the spun yarn, which exits from an outlet in the outlet zone. According to the invention, a winding-off nozzle for modifying the surface properties of the spun yarn is also provided in the outlet region downstream of the outlet in the yarn unwinding direction.

The rotor spinning machine according to the invention has at least one, preferably a plurality of and particularly preferably a plurality of mutually identical spinning stations for producing a yarn from a supplied fiber sliver, wherein the at least one spinning station and preferably all spinning stations are formed according to the invention.

In the method according to the invention for producing a yarn with modified surface properties, the first air-spinning of the yarn from the fiber sliver by means of an air-spinning nozzle is carried out, and the air-spun yarn is then guided through a unwinding nozzle in order to modify the yarn surface, preferably in the region of the yarn withdrawal from the air-spinning nozzle.

Finally, the invention comprises the use of an unwinding nozzle for modifying the surface properties of an air-jet spun yarn after an outlet in the spinning unwinding direction in an outlet zone in a spinning station, in particular of the invention, or in a rotor spinning machine, in particular of the invention.

The inventors have realized that it is possible to directly intervene on the air-flow method, for example by changing spinning parameters such as the spinning nozzle shape, the spinning pressure or the spinning speed, without the attendant disadvantages associated with the yarn quality. In this respect, it is part of the invention that the surface modification of the air laid yarn is carried out immediately after the air spinning operation, whereby the quality of the air spun yarn, which is determined by the spinning method, is not adversely affected. That is, the invention allows the modification of the surface of the spun yarn without intervening in the spinning process, so that firstly the spinning process is run with parameters optimal for this, in particular without taking into account the surface properties of the yarn, and subsequently the change of the surface properties of the yarn to the desired state by means of the outlet nozzle can be carried out subsequently. This allows a considerable expansion of the field of application and the application possibilities of the air-jet-spun yarn, in particular as knitting yarn, with a softer and/or more fibrous or more felted surface which is advantageous for this purpose.

The spinning station is any unit of a machine, in particular a rotor spinning machine, but alternatively a separate device, which is provided for producing a yarn from a fiber material, in particular a fiber sliver. Accordingly, a rotor spinning machine is a device having at least one spinning station, preferably a plurality of spinning stations, in particular identical to one another, each station being provided for producing a yarn from a fibrous material by means of rotor spinning.

An open-end spinning nozzle basically comprises a component, such as a yarn former, which is provided for forming a yarn. The open-end spinning nozzle can be, in particular, an assembly of several components of any open-end spinning device. The open-end spinning nozzle is preferably arranged in a spinning station. In addition, the spinning station can have any other component with any function. For supplying the fibrous material to be air-spun, the air-spinning nozzle has an inlet, via which the fibrous material, in particular in the form of a fiber sliver, can preferably be supplied continuously.

In addition, the air spinning nozzle has an outlet for the spun yarn, which is preferably arranged opposite the inlet. The outlet is arranged in an outlet region of the air spinning nozzle or of a unit having an air spinning nozzle, wherein any other component, in particular for discharging the yarn from the air spinning nozzle, can be arranged between the actual air spinning nozzle and the outlet, i.e. the region from which the air spun yarn exits. Particularly preferably, the outlet is a yarn channel outlet at the end of a yarn channel assigned to the air spinning nozzle, particularly preferably the end of a yarn receiving tube which is arranged downstream of the spinning cone of the yarn forming member of the air spinning nozzle in the yarn unwinding direction. The outlet zone thus extends from the outlet in the direction in which the spun yarn is drawn off from the air spinning nozzle.

According to the invention, the unwinding mouth is arranged after the outlet in the direction of yarn unwinding in the outlet zone. The withdrawal nozzle can be arranged directly after the outlet and at the same time, in particular directly at the yarn duct outlet or on the yarn take-up tube, or can be arranged at a distance from the outlet and between the outlet and the winding device for the winding air stream spun yarn. The withdrawal nozzle is preferably the component which is located next to the outlet in the direction of yarn withdrawal, i.e. preferably at least no further functional or non-functional component is present between the outlet and the withdrawal nozzle, preferably with the exception of one or more yarn guides in this region. It is also preferred that the unwinding mouth is arranged stationary and/or non-rotatably in the outlet or in the outlet zone.

The unwinding nozzle can in principle be constructed from any material and from any number of components. Preferably, at least the region of the withdrawal spout which comes into contact with the yarn, and particularly preferably the entire withdrawal spout, is made of ceramic material and/or is formed in one piece. It is also preferred that the unwinding mouth has at least locally, preferably completely, a conical or conically converging shape and/or a cylindrical shape.

It is also preferred that the size and/or shape of the unwinding nozzle is adapted to the yarn being spun or to the yarn to be modified. In this case, the internal diameter of the withdrawal spout or mouth is preferably between 0.5 mm and 2.5 mm, particularly preferably between 1 mm and 1.5 mm, and very particularly preferably between 1.1 mm and 1.3 mm. In addition, the length of the unwinding nozzle or the mouth for receiving the yarn is preferably at least equal to the diameter of the mouth, particularly preferably at least twice the diameter, and more particularly preferably between twice and ten times the diameter of the mouth. In principle, the cross-section of the mouth of the withdrawal spout can have any shape, but here a substantially circular cross-section is preferred.

According to the invention, the withdrawal nozzle brings about an advantageous surface modification of the air-spun yarn, wherein the surface modification preferably takes place essentially by friction on the surface of the withdrawal nozzle. The modification of the surface properties preferably comprises creating a fluffy and/or hairy yarn surface. For this reason, it is particularly preferred to produce fiber ends that protrude from the surface of the yarn. In this case, the modification of the yarn surface is carried out in particular immediately after the open-end spinning process, i.e. the unwinding nozzle preferably influences the open-end spun yarn, in particular its surface properties, directly at or after leaving the open-end spinning nozzle. For this purpose, the spun yarn preferably passes through the unwinding nozzle during the withdrawal from the air spinning nozzle, where the desired effect on the yarn surface is achieved.

It is also preferred that the yarn after the withdrawal nozzle extends past at least one, preferably a plurality of nipper rollers and/or past at least one yarn monitor and/or at least one yarn clearer and/or past at least one yarn guide. The yarn is then preferably wound into a package.

In a preferred embodiment of the spinning station according to the invention, the withdrawal nozzle has a nozzle opening for receiving the spun yarn in a completely surrounding manner, whereby a particularly advantageous contact of the yarn surface with the withdrawal nozzle surface and thus a very effective interaction can be achieved. The full-surface wrap-around accommodation is defined as the contact between the mouth surface of the withdrawal spout and the yarn surface, wherein at least one yarn section located in the withdrawal spout substantially surrounds or contacts the mouth surface in the entire circumferential direction.

According to an advantageous development of the spinning station according to the invention, the withdrawal nozzle preferably has a structured nozzle surface in the region of the nozzle opening and/or in the region of the surface which is in contact with the air-jet-spun yarn for mechanical interaction with the yarn surface to be modified, whereby a particularly strongly effective mechanical interaction is achieved. In this case, different degrees of structuring and/or structured shapes are possible in principle, in particular in connection with the desired or to be achieved surface modification and in connection with the fiber material used in open-end spinning and/or the strength of the open-end spun yarn. It is particularly preferred that the withdrawal spout has a plurality of regions which are structured differently from one another in order to achieve optimum surface modification. The region of the withdrawal spout which is in contact with the yarn surface is particularly preferably a wall on the inner side of the spout, which is also referred to as the spout surface.

According to a particularly advantageous development of the spinning station according to the invention, in the withdrawal nozzle, in the region of the mouth, in particular on the structured mouth surface, structural elements projecting from the mouth surface are provided for the purpose of mechanically interacting with the reinforcement of the yarn surface to be modified, as a result of which it is possible in a very simple manner to adapt the withdrawal nozzle to the respective desired yarn surface modification. The structural elements now project from the remaining mouth surface and/or from the cylindrical basic surface of the mouth. In principle, the structural elements on the mouth surface can be arranged in a disordered or ordered manner, in particular in a grid (Raster). The inner diameter of the unwinding nozzle or the diameter of the nozzle opening is preferably chosen such that the surface of the yarn to be modified comes into contact at least with the surface of the structural element. In this case, it is particularly preferred that there is a full-surface contact of the surface of the thread to be modified with at least one point of the surface of the structural element. The contact may be with only the structural elements protruding from the mouth surface, or at the same time with the remaining mouth surface.

In principle, the structural element can be formed as a projection having any shape. Preferably, the structural elements projecting from the mouth surface are constructed in the form of spirals, loops, crosses, cuts, grooves, quadrangles, circles, dots and/or other protrusions, whereby the desired properties of the yarn surface can be adjusted in a simple manner. But preferably all structural elements of at least one zone or one area have the same shape, height, size, length and/or width as each other. More particularly preferably, all structural elements of at least one region or of a region are of identical design to one another. However, it is also possible here to arrange a plurality of different structural elements in one region or in a region at the same time. When a plurality of different structural elements are arranged, they can be arranged not only randomly next to one another but also in a defined pattern, for example two different structural elements alternating in at least one spatial direction, in particular along the circumferential surface and/or parallel to the central longitudinal axis of the mouthpiece.

The respective shape of the structural elements projecting from the mouth surface, for example a cross shape, may then relate to the shape of these structural elements projecting from the surface, i.e. projecting in both directions on the mouth surface or on the wall of the withdrawal mouth delimiting the mouth. Alternatively, the respective shape can also in principle relate to the shape of the entire mouthpiece, which is in this case formed in particular by a plurality of structural elements arranged along the circumference of the mouthpiece, wherein the shape then particularly preferably exists in one direction along a cross-sectional plane of the mouthpiece, in particular perpendicularly to the central longitudinal axis of the mouthpiece.

In an advantageous embodiment of the spinning station according to the invention, the nozzle surface is provided with projecting structural elements that differ from one another in a plurality of regions, wherein preferably each of the regions extends over the entire circumference (Umfang) of the nozzle surface and/or the regions in the nozzle are arranged one behind the other, in particular along the central longitudinal axis of the nozzle, whereby a more precise and effective yarn surface modification is achieved. More particularly preferred is a design in which the mouthpiece is divided along the central longitudinal axis into at least two regions, a first region having a first shape of the protruding structural elements and/or a constant cross-section of the mouthpiece and a second region having a different shape of the protruding structural elements and/or a conically widening mouthpiece cross-section.

In a further advantageous embodiment of the spinning station according to the invention, the withdrawal nozzle is fixed so as to be rotatable, in particular about the central longitudinal axis of the nozzle, whereby the yarn drawn off from the open-end spinning nozzle can be pulled or moved through the rotating withdrawal nozzle, whereby a stronger and adjustable interaction with the open-end spun yarn during operation of the spinning station and thus a more effective surface modification of the yarn can be achieved in a very advantageous manner.

Drawings

In the following, embodiments of the spinning station according to the invention, each with a different unwinding mouth, are described in detail with reference to the accompanying drawings, which show:

FIG. 1 shows a schematic representation of a spinning station of a rotor spinning machine with a withdrawal nozzle arranged after the rotor spinning nozzle,

figure 2a shows a side cross-sectional view of a first embodiment of an unwinding nozzle,

figure 2b shows a view of the rear side of the unwinding nozzle shown in figure 2a,

figure 3a shows a side cross-sectional view of a second embodiment of an evacuation nozzle,

figure 3b shows a view of the rear side of the unwinding nozzle shown in figure 3a,

FIG. 4a shows a side cross-sectional view of a third embodiment of an unwinding nozzle, an

Fig. 4b shows a rear side view of the recoil nozzle of fig. 4 a.

List of reference numerals

1 spinning station

2 yarn

3 fiber strip

4 airflow spinning nozzle

5 inlet

6 outlet area

7 outlet port

8 backing-off mouth

9 nozzle

10 structured mouth surface

11 structural element

12 second structural element

13 first region

14 second region

16 drafting device

17 yarn forming member

18 air blowing nozzle

19 yarn unwinding mechanism

20 compressed air system

21 source of compressed air

22 control device

23 smooth mouth surface

Longitudinal axis of center A

Detailed Description

In a spinning station 1 of a rotor spinning machine, as shown in fig. 1, a fiber sliver 3 is fed to a rotor spinning nozzle 4 and spun there to form a yarn 2. For this purpose, the fiber sliver 3 is first drawn by means of a drawing device 16 and then fed to the air spinning nozzle 4 via the inlet 5. In the region of the air spinning nozzle 4, there is a blowing nozzle 18 which swirls the outer fibres of the fibre sliver 3 around the fibres in the centre of the fibre sliver 3 and thus forms the yarn 2 by means of a yarn forming member 17. For this purpose, the spinning station 1 has a compressed air system 20 with a compressed air source 21 and a control device 22.

Subsequently, the yarn 2 thus produced is guided from the air spinning nozzle 4 through the yarn channel of the yarn former 17 to the outlet 7 in the outlet zone 6 to be subsequently wound. Also in the outlet region 6, downstream of the outlet 7 in the yarn unwinding direction, a take-off nozzle 8 is provided, through which the air-spun yarn 2 is drawn by means of a yarn unwinding device 19 of the spinning station 1. The thread unwinding device 19 can be, in particular, a pair of rollers or an unwinding roller following the unwinding nozzle 8 in the thread unwinding direction or alternatively also a winding device for winding a winding bobbin, such as, for example, a cross-wound bobbin.

The unwinding mouth 8 is now provided for completing the modification of the surface properties of the yarn 2 spun in the air spinning mouth 4, thereby providing a softer yarn surface and a higher hairiness level of the yarn 2, which is thereby better suited as a knitting yarn and which in turn enables the production of a more attractive-to-touch fabric.

For this purpose, the first embodiment of the unwinding nozzle 8, as shown in fig. 2a and 2b, has a nozzle 9 through which the air-spun yarn 2 is pulled, wherein the diameter of this nozzle 9 is matched to the diameter of the yarn 2 being pulled through such that the surface of the yarn 2 can be modified by mechanical interaction and in particular by the friction occurring when the yarn 2 is pulled through. Here, the spout 9 is arranged centrally in the withdrawal spout 8.

For this purpose, the unwinding nozzle 8 has a structured, in particular roughened, nozzle surface 10 on the wall of the nozzle 9 that contacts the yarn 2 in at least one region. A region with a structured mouth surface 10 now has a constant diameter over its entire length, which diameter is adapted to the diameter of the thread 2 to be modified. Furthermore, the wall in the mouth 9 is rotationally symmetrical with respect to the central longitudinal axis a of the recoil nozzle 8, so that the recoil nozzle 8 can be used both in a stationary and non-rotating manner and also in a revolving manner about the central longitudinal axis a.

In the yarn unwinding direction, an inlet region 14 (see fig. 2a) with a conically tapering circular cross section is provided upstream of the region with the structured nozzle surface 10, which allows the air-jet-spun yarn 2 to enter the unwinding nozzle 8 very simply and prevents the yarn 2 from splitting in an advantageous manner. The inlet region 14 has a smooth, unstructured mouth surface 23, in which the interaction, in particular the friction, with the air-jet-spun thread 2 is low.

In the yarn unwinding direction, a further region 13 is provided downstream of the region with the structured mouth surface 10, which widens in a non-linear manner, in particular in an exponential manner, and whose cross section is also circular. The mouth surface 23 is also smooth and unstructured in this embodiment of the withdrawal mouth 8.

The second embodiment of the recoil nozzle 8, as shown in fig. 3a and 3b, differs from the first embodiment essentially in that identical structural elements 11 projecting from the nozzle surface 10 are provided in the region of the first region 13 in the nozzle opening 9, which form the structuring of the nozzle surface 10. Here, the structural elements 11 are arranged in a net and have the shape of a block protruding from the mouth surface 10, i.e. have a rectangular shape. The structural elements 11 projecting from the mouth surface 10 allow the enhancement of the interaction between the surface to be modified of the air-spun yarn 2 and the wall of the mouth 9.

The third embodiment of the unwinding mouth 8, shown in fig. 4a and 4b, differs from the embodiment shown in fig. 3a and 3b mainly in that the structured surface of the mouth 9, which forms the second structural element 12 in the form of a spiral protruding from the mouth surface, is also provided in a second region 14 of the mouth 9 following the first region 13 with the structured mouth surface 10 in the yarn unwinding direction.

With the aid of the spinning station 1 and in particular with the aid of a rotor spinning machine having a plurality of spinning stations 1 identical to one another, it is possible to produce a rotor spun yarn 2 in a very simple manner and without adversely affecting the spinning process and the spinning result, which has significantly better surface properties than conventional rotor spun yarns and can therefore be used in a significantly greater variety of ways.

In order to produce an air-spun yarn 2 with modified surface properties, a fiber sliver 3 is first drawn in a drawing device 16 and then fed to an inlet 5 of an air-spinning nozzle 4, where the fiber sliver 3 is spun into a yarn 2. The spinning position 1 is controlled by a control device 22 to form an optimal yarn 2. The spun yarn 2 leaves the air spinning nozzle 4 via a spinning cone 17 and is subsequently pulled through the unwinding nozzle 8 by means of a yarn unwinding mechanism 19 with a plurality of nipper rollers in order to achieve a modification of the surface properties of the yarn or of the yarn 2, in which case, in particular, a higher hairiness of the yarn surface is produced.

After the unwinding mouth 8 and possibly the yarn unwinding mechanism 19, the yarn 2 moves past the yarn monitor and the clearer. Subsequently, the yarn 2 is wound into a bobbin.

Claims

1. A spinning station (1) for producing a yarn (2) from a supplied sliver (3) of fiber, having an air spinning nozzle (4) with an inlet (5) for the supplied sliver of fiber and an outlet zone (6), the outlet zone (6) having an outlet (7) for the air spun yarn (2), characterized in that a unwinding nozzle (8) for changing the surface properties of the air spun yarn (2) is arranged in the outlet zone (6) downstream of the outlet (7) in the yarn unwinding direction.

2. A spinning station according to claim 1, characterised in that the unwinding mouth (8) has a mouth (9) for receiving the air-spun yarn (2) all around.

3. Spinning station according to claim 1 or 2, characterized in that the unwinding nozzle (8) has a structured nozzle surface (10) in the region of the nozzle opening (9) for mechanical interaction with the yarn surface of the yarn (2) to be modified.

4. Spinning station according to at least one of the preceding claims, characterized in that in the region of the mouth (9) there are provided structural elements (11) projecting from the mouth surface (10) for a reinforced mechanical interaction with the yarn surface to be modified.

5. Spinning station according to at least one of the preceding claims, characterized in that the structural elements (11) protruding from the mouth surface (10) are formed in the form of spirals, rings, crosses, cuts, grooves, corners, circles, dots and/or other projections.

6. Spinning station according to at least one of the preceding claims, characterized in that a plurality of regions (13,14) of mutually different projecting structural elements (11,12) are provided on the mouth surface (10), wherein each region (13,14) extends over the entire circumference of the mouth surface (10) and/or the regions (13,14) are arranged one behind the other in the mouth (9).

7. The spinning station according to at least one of the preceding claims, characterized in that the nozzle (9) is divided into at least two zones (13,14) along a central longitudinal axis (a), wherein a first zone (13) has a first shape of the protruding structural element (11) and/or a constant cross section of the nozzle (9) and a second zone (14) has a different shape (12) of the protruding structural element (12) and/or a conically widening cross section of the nozzle (9).

8. A spinning station according to at least one of the preceding claims, characterised in that the unwinding mouth (8) is fixed so as to be able to revolve around the central longitudinal axis (a) of the mouth (9).

9. Rotor spinning machine having at least one spinning station (1) for producing a yarn (2) from a supplied fibre sliver (3) according to at least one of claims 1 to 8.

10. A method of manufacturing a yarn (2) having modified surface properties, the method comprising the steps of:

-air spinning a yarn (2) from a fiber sliver (3) by means of an air spinning nozzle (4),

-guiding the air-spun yarn (2) through a rewinding nozzle (8) while drawing the air-spun yarn (2) from the air-spinning nozzle (4) to modify the yarn surface.

11. Use of a stripping nozzle (8) in the outlet zone (6) after the outlet (7) of an air spinning nozzle (4) of a spinning station (1) for modifying the surface properties of an air spun yarn (2).