SPINNING ELEMENT OF AN AIR-JET SPINNING NOZZLE FOR AN AIR-JET SPINNING MACHINE

Abstract

A spinning element of an air-jet spinning nozzle for an air-jet spinning machine for producing a yarn from a sliver using an airflow. The spinning element of the air-jet spinning nozzle for the air-jet spinning machine and a corresponding air-jet spinning nozzle allows a particularly inexpensive, low-maintenance, and simple operation of an air-jet spinning machine without compromising the quality and strength of the air-jet spun yarn and without requiring frequent cleaning. This is achieved in that the spinning element has at least one fibre- and/or thread-guiding surface, an anti-adhesive coating being located on at least some sections of the fibre- and/or thread-guiding surface.

Claims

1. A spinning element of an air-jet spinning nozzle for an air-jet spinning machine for producing a yarn from a fibre band by an air flow, with at least one fibre-guiding and/or thread-guiding surface, wherein the at least one fibre-guiding and/or thread-guiding surface exhibits at least on portions a non-stick coating.

2. The spinning element according to claim 1, wherein the non-stick coating has a lower coefficient of friction than underlying material of the spinning element.

3. The spinning element according to claim 1, wherein a coefficient of friction of the at least one fibre-guiding and/or thread-guiding surface with the non-stick coating is less than 0.3.

4. The spinning element according to claim 1, wherein the non-stick coating consists of polytetrafluoroethylene or a perfluoroalkoxy polymer or a tetrafluoroethylene-hexafluoropropylene copolymer.

5. The spinning element according to claim 1, wherein the at least one fibre-guiding and/or thread-guiding surface is at least one surface portion of a spinning cone and/or of a needle and/or of a pair of tweezers of the air-jet spinning nozzle.

6. The spinning element according to claim 1, wherein the spinning element is a spinning cone whose surface at least in a region of a tip thereof has at least 25% of a length of the spinning cone running in a yarn removal direction and at least 25% along a circumferential direction thereof has the non-stick coating wherein the spinning cone exhibits an inlet mouth to accept spun yarn into an extraction channel defining the yarn removal direction.

7. The spinning element according to claim 1, wherein the at least one fibre-guiding and/or thread-guiding surface is a surface surrounding the yarn and/or the fibre band.

8. The spinning element according to claim 7, wherein the surface surrounding the yarn and/or the fibre band is an inner wall of the air-jet spinning nozzle.

9. The spinning element according to claim 1, wherein the non-stick coating exhibits a layer thickness of between 10 m and 200 m.

10. The spinning element according to claim 1, wherein the non-stick coating exhibits an antistatic surface.

11. An air-jet spinning nozzle for an air-jet spinning machine, with at least one spinning element arranged inside the air-jet spinning nozzle according to claim 1.

12. The spinning element according to claim 6, wherein the surface of the spinning cone is a fibre-guiding and/or thread-guiding surface.

13. The spinning element according to claim 8, wherein the inner wall is of a vortex chamber.

14. An air-jet spinning machine comprising: an air-jet spinning nozzle having a spinning element for producing a yarn from a fibre band by an air flow; the spinning element including at least one fibre-guiding and/or thread-guiding surface; and a non-stick coating on at least a portion of the at least one fibre-guiding and/or thread-guiding surface.

15. The air-jet spinning machine according to claim 14, wherein the at least one fibre-guiding and/or thread-guiding surface is at least one surface portion of at least one of a spinning cone, a needle, a pair of tweezers of the air-jet spinning nozzle.

16. The air-jet spinning machine according to claim 14, wherein the spinning element comprises a spinning cone whose surface at least in a region of a tip thereof has at least 25% of a length of the spinning cone running in a yarn removal direction and at least 25% along a circumferential direction thereof has the non-stick coating, and wherein the spinning cone includes an inlet mouth to accept spun yarn into an extraction channel defining the yarn removal direction.

17. The air-jet spinning machine according to claim 14, wherein the at least one fibre-guiding and/or thread-guiding surface is a surface surrounding the yarn and/or the fibre band.

18. The air-jet spinning machine according to claim 17, wherein the surface surrounding the yarn and/or the fibre band is an inner wall of the air-jet spinning nozzle.

19. The air-jet spinning machine according to claim 14, wherein the non-stick coating has a thickness of between 10 m and 200 m.

20. The air-jet spinning machine according to claim 1, wherein the non-stick coating is antistatic.

Description

[0028] An embodiment example of the spinning element according to the invention is described in more detail by reference to the drawing. In the drawing:

[0029] FIG. 1 shows a schematic perspective view of components of an air-jet spinning nozzle, including a spinning element with a non-stick coating.

[0030] In an air-jet spinning nozzle 2 shown schematically in FIG. 1 of an air-jet spinning machine, a fibre band 4 is fed from a drafting system via a delivery roller pair 10 to a vortex chamber of the air-jet spinning nozzle 2, in order to interlace the outer fibres of the fibre band 4 around a fibre core and thus to form a yarn 3.

[0031] In this, the air-jet spinning nozzle 2 exhibits a plurality of spinning elements 1 which each have a fibre-guiding or thread-guiding surface 5 respectively. One of the spinning elements 1 is a needle 9 which has a fibre-guiding surface and is arranged in the region of a fibre inlet opening of the air-jet spinning nozzle 2, while another spinning element 1 is a spinning cone 8 which in the region of its tip has a fibre-guiding and thread-guiding surface 5.

[0032] To reduce the static and dynamic friction between the spinning elements 1 and thus achieve a higher wrap fibre angle and consequently a higher yarn strength, a non-stick coating 6 is applied at least to the tip of the spinning cone 8. According to this preferred embodiment example, this non-stick coating 6 is a polytetrafluoroethylene (Teflon, PTFE) coating that is applied extensively and with a smooth surface to the material 7 of the spinning cone 8 and thereby exhibits a significantly lower coefficient of friction than the material 7 of the spinning cone 8. Alternatively to the Teflon coating, the coating according to a further preferred embodiment example may comprise a perfluoroalkoxy alkane polymer or a perfluoroalkoxy polymer (PFA) respectively or a fluorinated ethylene propylene polymer or a tetrafluoroethylene-hexafluoropropylene copolymer (FEP) respectively or a mixture of the mentioned coatings.

[0033] In addition to at least one surface portion of the spinning cone 8, the portion of the needle 9 also coming into contact with the fibre band 4 may also have a non-stick coating 6, which preferably also consists of a fluorinated hydrocarbon or fluorinated hydrocarbon polymer, particularly polytetrafluoroethylene (Teflon, PTFE) and/or a perfluoroalkoxy alkane polymer or a perfluoroalkoxy polymer (PFA) respectively and/or a fluorinated ethylene propylene polymer or a tetrafluoroethylene-hexafluoropropylene copolymer (FEP) respectively.

[0034] In addition to the aforementioned fibre-guiding and/or thread-guiding surfaces 5, a surface surrounding the fibre band 4 and/or the yarn 3, particularly at least one portion of an inner wall of the air-jet spinning nozzle 2 and particularly preferably an inner wall of a vortex chamber, can also have a non-stick coating 6, which quite particularly preferably exhibits the same chemical composition as the non-stick coating 6 of the spinning element or spinning elements 1.

LIST OF REFERENCE SIGNS

[0035] 1 Spinning element [0036] 2 Air-jet spinning nozzle [0037] 3 Yarn [0038] 4 Fibre band [0039] 5 Fibre-guiding and/or thread-guiding surface [0040] 6 Non-stick coating [0041] 7 Material [0042] 8 Spinning cone [0043] 9 Needle [0044] 10 Delivery roller pair