Interlacing nozzle for producing a yarn with knots and method of interlacing a yarn
By optimizing the shape and size of the air twisting chamber and the airflow vector, the problem of high energy consumption in the existing technology has been solved, and efficient yarn interlacing under low air pressure and air volume has been achieved to form stable knots.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- HEBERLEIN TECHNOLOGY AG
- Filing Date
- 2021-08-10
- Publication Date
- 2026-07-21
AI Technical Summary
Existing interlocking nozzles require high air pressure and air volume to achieve the knot thickness and knot number of the yarn, resulting in high energy consumption and low efficiency.
By optimizing the shape and size of the air twisting chamber, adjusting the airflow vector and the geometry of the air inlet, the number and quality of knots can be controlled, and the air pressure and air volume can be reduced.
Effective yarn interlacing is achieved under low air pressure and air volume, saving energy while maintaining the number and strength of knots, and reducing the air volume requirement by about 20%.
Smart Images
Figure CN117337345B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a cross-lacing nozzle for producing knotted yarn, cross-laced yarn, knotted stretch textured yarn (DTY yarn) or untwisted yarn, and a method for cross-lacing yarn having the features of the general term in the independent claims. Background Technology
[0002] Various jetting devices are known from the prior art. Nozzle devices are typically used to guide, accelerate, and precisely apply fluids. Fluids can be gases or liquids. In textile machines, nozzle devices are used to join, form, or process yarns, etc. The shape of the chamber in which yarn processing takes place determines the desired result and the amount of fluid required for it.
[0003] In known interlacing nozzles, the processing chamber typically includes an air twisting chamber, into which a fluid flow is introduced and forms a vortex. To achieve sufficient vortexes, high velocities are required. This is achieved by blowing air into the chamber under high pressure.
[0004] Interlocking nozzles are used to process various threads, yarns, cables, or similar materials. These can be made of synthetic fibers (plastics such as PE, PP, etc.). They can also be made of natural fibers (cotton, wool, plant bast, etc.) or blended fibers. In this article, the term "yarn" is used to refer to all these types of materials.
[0005] Cross-linking nozzles are primarily used for cross-linking yarns made of synthetic fibers. Cross-linking offers several advantages. For example, it can improve the winding structure, unwinding characteristics, process running characteristics, or running characteristics during reprocessing. It can prevent filament breakage. It can bind pushed / -filaments or fibers. Furthermore, it can reduce sizing or achieve unsizing weaving. It can replace twisting / high-speed twisting. Cross-linking also allows for the combination of different yarns with different properties or the production of fancy yarns.
[0006] A nozzle device is known from US5809761, which includes a splicing chamber with two lateral chamber zones. In this nozzle, the yarn itself does not move. It is not suitable for cross-lacing. Summary of the Invention
[0007] One objective of this invention is to overcome these and other disadvantages of the prior art. In particular, it provides a nozzle device that offers highly efficient and reliable yarn handling. This invention is especially aimed at allowing the desired knot thickness and / or knot number of the yarn to be achieved with the lowest possible air pressure and volume, and correspondingly low energy requirements.
[0008] These tasks are accomplished by the interlacing nozzle and the method of interlacing yarn for producing knotted yarn, cross-linked yarn, knotted stretch textured yarn (DTY yarn) or untwisted yarn, according to the characteristic portion of the independent claims.
[0009] The interlacing nozzle according to the invention includes a yarn channel with an air twisting chamber. The air twisting chamber has an inlet for introducing air into the chamber. The channel axis extends along the yarn guiding direction. The yarn channel has a channel width transverse to the channel axis. The air twisting chamber has a chamber length along the yarn guiding direction and a chamber extension dimension transverse to said length. The chamber length is at least 180% of the chamber extension dimension, preferably at least 200%.
[0010] Surprisingly, it has been found that the number and / or quality of knots can be controlled by selectively choosing the shape and size of the chamber.
[0011] Typically, as described below, the chamber length, the shape or proportion of the air inlet cross-section, the chamber extension dimension, or the angle of the chamber wall relative to the yarn passage wall can be selectively adjusted individually or in combination to set the desired number and / or quality of knots.
[0012] For example, a chamber length (relative to the chamber extension dimension) between 210% and 230%, particularly about 220%, results in fewer but more stable knots. A length between 320% and 340%, particularly about 330%, results in many but less stable knots. The chamber length is preferably at least 1.5 millimeters (mm) longer than the chamber extension dimension. Therefore, another aspect of the invention relates to a method for adjusting the number and / or quality of knots, wherein the shape and size of the air twisting chamber are specifically selected to define the number and / or quality of knots. In particular, the chamber length is selected relative to the chamber extension dimension, wherein shorter lengths are selected to form fewer but more stable knots, while larger lengths are selected to form more but therefore less stable knots. In any case, the chamber length is greater than 180% of the chamber extension dimension, and is preferably selected as described above.
[0013] The airflow vector (flow direction and intensity) within the air twisting chamber, along with the overfeed, determines the number and strength of knots. Overfeed indicates how much longer the yarn entering the nozzle is than the yarn exiting. This excess is used to form knots. When processing yarn in a twisting nozzle, different components of the airflow vector lead to different effects: the component of the airflow vector guided in the yarn guiding direction or the opposite direction affects yarn feeding and yarn tension. The component of the airflow vector guided transversely to these directions interlocks the yarn and is therefore essential for knot formation. The inventors concluded that, for optimal processing, the airflow direction within the air twisting chamber should be guided such that the transverse component of the airflow is greater than the component in the yarn guiding direction or the opposite direction. On the other hand, outside the air twisting chamber, the airflow vector should have a greater component in the yarn guiding direction to ensure sufficient yarn delivery. The airflow vector is influenced by the geometry of the air twisting chamber, the yarn passage, and the air inlet.
[0014] To achieve a sufficient number and strength of knots, as well as adequate yarn tension and guidance, conventional interlacing nozzles require high air pressure and high air volume. By guiding the airflow with a geometry optimized according to the present invention, the ratio of the airflow vector in the yarn guiding direction and the transverse direction is optimized, thereby reducing air volume and air pressure without affecting quality, thus saving energy.
[0015] It has been shown that a ratio of at least 1.8 for the chamber length of an air twisting chamber to the chamber extension dimension transverse to the chamber length directs airflow within the air twisting chamber to a longer region transverse to the yarn guiding direction, thus requiring lower air pressure and air volume to ensure adequate yarn interlacing. Airflow introduced via the inlet through this interlacing nozzle can reduce the amount of fluid introduced by up to 20%, while the yarn still retains the required number of knots and knot strength after treatment.
[0016] Specifically, the chamber length can be 180%, 200%, 218%, 228%, or 330% of the chamber extension dimension, preferably 1.5 mm, 2 mm, 3 mm, or 3.5 mm. Specific values can be, for example, 1.75 mm, 2.67 mm, 2.94 mm, or 3.08 mm. Preferably, the chamber length is at least 35% of the total nozzle length. The total nozzle length consists of the yarn passage length and the chamber length.
[0017] The chamber extension dimension is understood here as the maximum extension of the air twisting chamber in the transverse direction to both the yarn guiding direction and the depth of the air twisting chamber.
[0018] An air twisting chamber may consist of two adjacent chambers, and the length of the chamber is composed of the length of the chambers.
[0019] The air twisting chamber may consist of only one chamber section with rounded walls. The radius of the rounded walls increases along the yarn guiding direction toward the center of the air twisting chamber, and then decreases again.
[0020] However, the air twisting chamber may also comprise two air twisting chamber regions, wherein the walls are rounded in the yarn guiding direction, and the rounding of the first region in the yarn guiding direction has a larger radius than that of the second region. In this case, the walls of the regions preferably meet each other without any bends.
[0021] The air twisting chamber can have a generally teardrop-shaped cross-section in the plane along the axis of the yarn passage and in the transverse direction, so that the chamber has arc-shaped sections and straight sections. The straight sections are arranged to converge in the direction of yarn guidance and in the opposite direction, respectively.
[0022] Preferably, the air inlet is arranged in the interlacing nozzle, such that the airflow enters the air twisting chamber at an angle greater than or less than 90° with the channel axis. Preferably, the air inlet is arranged such that the airflow enters the air twisting chamber within a range smaller than the chamber extension dimension.
[0023] Preferably, the chamber extension dimension is 15% to 45% wider than the channel width, more preferably 15% and 35%, and more preferably, the chamber extension dimension is at most 5 mm wider than the channel width, more preferably at most 3 mm wider. The chamber extension dimension is smaller when the chamber length is 330% of the chamber extension dimension to form a large number of knots. Typically, it is close to 15% of the channel width. Larger chamber extension dimensions are chosen to create fewer but more stable knots, for example, 35% of the channel width.
[0024] This improves airflow from the chamber into the yarn passage. The chamber extension dimension can preferably be between 1.75 mm and 17 mm.
[0025] Preferably, the chamber length is at most 350% of the channel width, and particularly at most 30 mm larger than the channel width, preferably at most 20 mm.
[0026] Preferably, the air twisting chamber has a chamber wall having at least one rounded section in the direction of yarn guidance, particularly with a radius between 0.3 mm and 6 mm, preferably between 0.5 mm and 2 mm.
[0027] Preferably, the chamber is convex and rounded. Preferably, the chamber wall further includes a straight wall section.
[0028] This allows air to be easily directed in a specific direction.
[0029] Preferably, the chamber wall widens from the passage wall when viewed along the direction of the suture guidance. In particular, the chamber wall may widen at an angle of up to 5° relative to the direction of the suture guidance and the passage wall.
[0030] Preferably, the first chamber is arranged along the direction of the thread guiding, and the second chamber is immediately adjacent to the first chamber in the same direction. At the transition from the first chamber to the second chamber, the chamber has a contraction section, such that the chamber extension dimension in the first and second chambers is larger than the chamber extension dimension at the transition section.
[0031] This allows airflow to be separated. Due to this separation of air masses, the amount of air in each compartment can be controlled, in addition to the intake angle.
[0032] The air twisting chamber may also include two or more chamber zones, each separated by a contraction. The air twisting chamber may include other structures to guide airflow, such as surface structures, ribs, edges, contractions, or widening sections. The air twisting chamber may include a coating for creating air vortices.
[0033] The first chamber zone may have a first chamber depth that is transverse to the chamber length and the chamber extension dimension, and the second chamber zone may have a second chamber depth that is transverse to the chamber length and the chamber extension dimension, wherein the chamber depths may be different.
[0034] According to another aspect of the invention, the interlacing nozzle includes a yarn passage having an air twisting chamber. The air twisting chamber has an air inlet for introducing air into the air twisting chamber. The channel axis extends along the yarn guiding direction. According to the invention, the cross-section of the air inlet has at least one arcuate section and at least one air guiding section, wherein the air guiding section is straight or its radius of curvature is at least 10 times the radius of curvature of the arcuate section.
[0035] The cross-sectional geometry of the air inlet has a direct impact on the mass and direction vector of the vortex.
[0036] Preferably, the (multiple) air duct sections are not arranged parallel to the channel axis. In the interlacing nozzle, the transverse airflow plays a decisive role in the interlacing of the yarn. If more air is directed transversely, the yarn will be interlaced more intensely, and more and stronger knots will form.
[0037] Preferably, the air inlet comprises exactly four straight air duct sections in cross-section, arranged in a generally rhomboid shape and preferably connected to each other by rounded corners forming arc-shaped sections. Preferably, the first line of symmetry of the rhombus is arranged parallel to and preferably coincides with the channel axis, such that the first corner of the rhombus points in the direction of the wire guidance, the second corner points in the opposite direction, and the third and fourth corners are arranged opposite to each other in a common plane perpendicular to the first line of symmetry.
[0038] Therefore, the airflow can be easily guided during the blowing stage. The cross-sectional shape can also be triangular or polygonal, in which case the corners are rounded. Preferably, the shape includes an even number of rounded corners, and the cross-sectional shape in the air twisting chamber is arranged such that the corners point in the direction of yarn guidance and in the opposite direction.
[0039] The cross-sectional shape can also be trapezoidal or kite-shaped.
[0040] It has been shown that the number and stability of knots are affected by the choice of cross-sectional shape. A diamond-shaped intake results in fewer but more stable knots. A kite-shaped intake results in more but less stable knots.
[0041] Preferably, the corners of the rhombus are rounded. Preferably, the air inlet includes a cross-section having an opening length along the filament guiding direction and an opening width transverse to the opening length. The opening length and opening width are different; specifically, the ratio of the opening length to the opening width is between 1.0 and 1.5. A smaller ratio (typically 1.0) is used to generate a greater number of knots.
[0042] Therefore, a rhombus includes angles greater than or less than 90° between its sides. Preferably, the radius of the rounding for obtuse angles is different from the radius of the rounding for acute angles.
[0043] Alternatively, the cross-section of the air intake can be at least approximately elliptical.
[0044] The specific choice of opening width and opening length allows for the redirection of airflow in a particular direction: if the opening length is greater than the opening width, the angle at which air flows into the chamber at maximum speed changes. Airflow can thus be guided.
[0045] Preferably, the opening length is less than the opening width, and preferably, the first and second corners of the rhombus are rounded with a larger radius than the third and fourth corners.
[0046] Alternatively, the opening width can be smaller than the opening length, and preferably the third and fourth corners of the rhombus are rounded with a larger radius than the first and second corners.
[0047] Depending on the yarn being processed, this specific opening selection allows for precise adjustment of airflow and volume, thereby regulating air speed.
[0048] Another aspect of the invention relates to a cross-linking nozzle having a yarn channel with an air twisting chamber, the air twisting chamber including an air inlet for introducing air into the air twisting chamber. Specifically, the cross-linking nozzle is as described above. The channel axis extends along the yarn guiding direction. The yarn channel has a channel width transverse to the channel axis. The air twisting chamber has a chamber length in the yarn guiding direction and a chamber extension dimension transverse to that length. The air twisting chamber and / or the air inlet are formed and arranged in the yarn channel such that air introduced through the air inlet is guided to have a vector having a transverse component transverse to the channel axis that is larger than the axial component along the channel axis within the air twisting chamber, and an axial component that is larger than the transverse component outside the air twisting chamber.
[0049] In the twisting nozzle, the transversely guided airflow along the channel axis results in stronger yarn twisting, thus playing a decisive role in the formation of knots within the yarn. Axial airflow transports the yarn along the yarn guiding direction, thereby generating stronger yarn tension. Because the airflow in the air twisting chamber is guided more transversely than axially, more knots are formed in the yarn. If the air is also guided more axially outside the air twisting chamber, sufficient yarn tension can be maintained to ensure a stable process. If the yarn tension is too low, the yarn will oscillate violently in front of the nozzle, potentially leading to breakage. Here, the transverse component always includes both radial and tangential components, because the radial component determines the number of knots, while the tangential component determines the yarn tension.
[0050] The air twisting chamber can be designed such that air vortexes over at least 40% of the total nozzle length. The total nozzle length includes the yarn passage length and the chamber length of the air twisting chamber.
[0051] Preferably, the lateral component includes a radial component that is larger than the tangential component.
[0052] The air thus intertwines violently, which in turn twists the yarn to a greater extent, resulting in stronger yarn and more knots.
[0053] Alternatively, the lateral component has more tangential components than the radial component.
[0054] This causes more yarn to be guided out of the nozzle, resulting in greater yarn tension.
[0055] Furthermore, these tasks are addressed using a yarn-crossing method. The yarn is guided along the yarn channel axis of the yarn channel of the cross-linking nozzle. Air is introduced into the air twisting chamber and guided into the following vector: the vector within the air twisting chamber includes a transverse component more than the axial component along the channel axis, and the vector outside the air twisting chamber includes a greater axial component than the transverse component.
[0056] This provides a simple way to ensure that yarns achieve a large number of strong knots under low air volume or low air pressure. Attached Figure Description
[0057] The invention is described in more detail in the accompanying drawings. The drawings show:
[0058] Figure 1 : A top view of a first embodiment of the interlocking nozzle for generating a plurality of stable knots according to the present invention;
[0059] Figure 2 : Figure 1 Detail D in the middle;
[0060] Figure 3 : Figure 1The air intake in the middle;
[0061] Figure 4 : A top view of a second embodiment of the interlacing nozzle according to the present invention;
[0062] Figures 5a to 5d A representation of the airflow velocity in an air inlet with a circular cross-section and a velocity scale;
[0063] Figures 6a to 6d A representation of the airflow velocity in an air inlet with a rhomboid cross-section and a velocity scale;
[0064] Figures 7a to 7d The prior art shows the representation and velocity scale of airflow velocity in an interlacing nozzle with an air twisting chamber, wherein the chamber length of the air twisting chamber is less than the chamber extension dimension;
[0065] Figures 8a to 8d : Representation and velocity scale of airflow velocity in an interlacing nozzle with an air twisting chamber, wherein the chamber length of the air twisting chamber is greater than the chamber extension dimension;
[0066] Figure 9 Side-by-side illustrations of airflow velocities for various interlaced nozzle designs;
[0067] Figure 10 : The cross-section of the interlacing nozzle along the direction of the filament guidance;
[0068] Figure 11a and Figure 11b Example of interlaced yarn;
[0069] Figure 12 : A top view of another embodiment of the interlocking nozzle according to the invention for producing more but less stable knots;
[0070] Figure 13 :like Figure 12 The air intake shown; and
[0071] Figure 14a and Figure 14b Comparison of the number of knots and the stability of knots in yarns treated with the nozzle according to the invention and with a nozzle according to the prior art. Detailed Implementation
[0072] Figure 1A first embodiment of the interlacing nozzle 100 according to the present invention is shown in top view. The shape, size, and geometry of the nozzle are designed to produce some but stable knots. The interlacing nozzle 100 includes a nozzle plate 10 having a yarn channel 1 with two channel sections 1a and 1b and an air twisting chamber 2 between these sections 1a and 1b. The yarn guiding direction F extends along the central axes Ma and Mb of the channel sections 1a and 1b. The air twisting chamber 2 includes two chamber sections 2a and 2b. An air inlet 4 is arranged at the transition between the first chamber section 2a and the second chamber section 2b, through which airflow is injected into the air twisting chamber 2.
[0073] Along the direction F guided by the silk thread, the first passage section 1a is arranged first, followed by the first chamber section 2a, the second chamber section 2b, and then the second passage section 1b.
[0074] An inlet 3a is located at the entrance of the first channel section 1a, and an outlet 3b is located at the exit of the second channel section 1b. Channel section 1a is shorter than channel section 1b. The two channel sections have an extension dimension 21 of 1.7 mm in the direction of the drawing plane. The nozzle plate 10 has a structure that is approximately mirror-symmetrical with respect to a plane passing through the central axes Ma and Mb and perpendicular to the plate surface.
[0075] The nozzle plate 10 includes a bottom surface 13, the outline of which includes two generally opposite straight sides 15a and 15b and two rounded sides 16a and 16b also opposite to each other. Each straight side has generally trapezoidal recesses 14a and 14b, the axes of symmetry of which lie on the central axes Ma and Mb. Protrusions 12a and 12b for mounting the nozzle to a support are arranged on each rounded side. The protrusions 12a and 12b have substantially the same radius as the rounded sides 16a and 16b. However, the protrusions 12a and 12b are shorter than these sides.
[0076] The nozzle plate 10 also includes two circular openings 11a and 11b extending through the nozzle plate 10.
[0077] The air twisting chamber 2 has a chamber length 29 of 4.69 mm and a chamber extension dimension 28 of 2.32 mm in the yarn guiding direction F. The chamber extension dimension 28 should be understood as the maximum extension of the air twisting chamber 2 in the plate plane transverse to the chamber length 29. The chamber extension dimension 28 and the chamber length 29 result in a length-to-extension ratio of 2.02.
[0078] The nozzle plate 10 is connected to the cover plate to enclose the channel sections 1a, 1b and the air twisting chamber 2. One or more filaments are introduced and pass through the air twisting chamber 2, while compressed air is applied to the one or more filaments through the air inlet 4. As a result, knots are formed in the one or more filaments.
[0079] Since the air twisting chamber 2 is longer in terms of its extended dimensions, it guides the air to a greater extent in the lateral direction compared to the case in a shorter chamber, and the air is guided through a longer area in this lateral direction.
[0080] The component of the airflow vector transverse to the direction of yarn guidance is responsible for interlacing, and therefore for the number and strength of knots. If the yarn now undergoes more interlacing over a longer area, more and tighter knots will form.
[0081] Figure 2 It shows Figure 1 Detail D shows a processing chamber 2 with two chamber zones 2a and 2b. Chamber zone 2a has a first chamber width 22 transverse to the central axis Ma, and the second chamber zone 2b has a second chamber width 23 transverse to the central axis Mb. A constriction section 5 is arranged between these chamber zones 2a and 2b. That is, the chamber width 22 of the first chamber zone 2a and the chamber width 23 of the second chamber zone 2b are greater than the chamber width 51 between these chamber zones 2a and 2b. The chamber width 23 of the second chamber zone 2b is equal to or greater than (preferably about 5%) the chamber width 22 of the first chamber zone 2a. The chamber length here is approximately 200% of the chamber extension dimension. Chamber zones 2a and 2b have a teardrop-shaped cross-section in the plate plane, which has rounded sections and straight sections converging along the wire guiding direction.
[0082] The contraction section 5 causes the airflow to be separated, forming two regions in which the air and yarn vortex in different ways.
[0083] The first chamber region 2a has a first region length 24 parallel to the central axes Ma and Mb, which is equal to or longer than the second region length 25 parallel to the central axes Ma and Mb of the second chamber region 2b. The chamber length 29 of the air twisting chamber 2 is composed of the first region length 24 and the second region length 25, and is 5.1 mm.
[0084] The walls of chambers 2a and 2b are offset from the wall of the yarn passage at certain angles. The wall of the first chamber 2a has an angle P of approximately 18° to 20° (specifically 19°) relative to the wall of the yarn passage, and the wall of the second chamber 2b also has an angle S of 18° to 20°. Smaller angles (see also below) Figure 12 and Figure 13 A larger angle is used to produce more knots, while a smaller angle is used to produce fewer but more stable knots. The zone lengths 24 and 25 are determined by the chamber extension dimension (i.e., the width of the air twisting chamber) and the angle. The width and / or angle of the air twisting chamber can be the same or different.
[0085] However, other sizes and geometries are also conceivable. The aforementioned geometry can also be used for nozzles with a maximum length of 45 mm and a maximum channel width of 12 mm. For example, the radius in the yarn channel base can then be adjusted accordingly.
[0086] Figure 3 Showing from Figure 1 The air inlet 4 of the embodiment. Chambers 2a and 2b of the air twisting chamber 2 (see...) Figure 1 The air twisting chambers 2 (see below) are arranged close to each other, thus forming an air twisting chamber. Figure 1 A narrow section 5 of a certain width is provided at the transition between these chambers 2a and 2b. An air inlet 4 is arranged at the transition between chambers 2a and 2b. Most of the cross-section of the air inlet 4 opens into the first chamber 2a.
[0087] The cross-sectional shape of the air inlet 4 is generally a parallelogram with rounded corners 41-44. The rounded corners 41-44 are arc-shaped sections. The sides of the parallelogram are air guiding sections 45, which guide air in a specific direction. The first corner 41 points towards the yarn guiding direction F, and the second corner 42 points towards the opposite direction of the yarn guiding device, such that the lines of symmetry 40 of the parallelogram are arranged along the central axes Ma and Mb. Both the first corner 41 and the second corner 42 are rounded with a radius of 0.2 mm to 2.5 mm. The third corner 43 and the fourth corner 44 are both located in a plane perpendicular to the central axes Ma and Mb and are rounded with a radius of 0.3 mm to 3 mm. The angle between these straight sections is approximately 50° for acute angles and approximately 130° for obtuse angles. The width of the air inlet is typically 1 mm to 10 mm, preferably about 1.32 mm, and the length is 0.8 mm to 7 mm, preferably about 0.99 mm, so the width-to-length ratio is about 1.33:1.
[0088] If the air inlet has a parallelogram or rhombus shape as shown in the figure, it guides air more in the lateral direction of the filament guidance direction, which has tangential and radial components. The corners 41 and 42, located on the line of symmetry along the filament guidance direction, are obtuse angles, while the other corners 43 and 44 are acute angles. These angles affect the direction of airflow and can therefore be adjusted depending on whether the airflow includes more tangential or radial components.
[0089] Figure 4 A top view of a second embodiment of the interlacing nozzle 100 according to the present invention is shown. The interlacing nozzle 100 in this embodiment has a nozzle plate 110 that is substantially the same as that in the first embodiment. Therefore, only the differences from the first embodiment will be discussed below.
[0090] In this embodiment, the air twisting chamber 102 has two chamber regions. The chamber wall 127a of the first chamber region, arranged along the yarn guiding direction F, has a rounded shape along the yarn guiding direction, the radius of which is larger than the radius of the rounded shape of the wall portion 127b of the second chamber region along the yarn guiding direction F. The radius of the rounded shape of the first wall portion 127a can vary. Typically, it is approximately 25 mm. The radius of the rounded shape of the second wall portion 127b can also vary and is approximately 15 mm.
[0091] In the embodiment shown here, the air twisting chamber 102 has a chamber length 129 of 6.85 mm and a chamber extension dimension 128 of 3 mm. The yarn passage 101 has an extension dimension 121 of 2.4 mm.
[0092] The air intake 104 includes and Figure 3 The parallelograms shown have roughly the same cross-sectional shape, with rounded corners.
[0093] The air inlet 104 is arranged such that the airflow enters the air twisting chamber 102 at an angle of less than 90°.
[0094] Figure 5a A nozzle with an air inlet having a circular cross-section is shown, as used in conventional interlaced nozzles. Simulations were performed to illustrate the effect of the cross-sectional shape on airflow. Figures 5b to 5d (as well as Figures 6b to 6d The simulation in the example is based on a cross-linking nozzle with a yarn channel but no air twisting chamber.
[0095] like Figure 1 or Figure 4 As shown, this known air inlet can also be arranged in the air twisting chamber 2 of the interlaced nozzle according to the invention.
[0096] Figure 5b It shows Figure 5c and Figure 5d The flow rate scale shown is shown.
[0097] Figure 5c It shows Figure 5a Airflow velocity in the top view of the nozzle. It can be seen that the airflow with the highest velocity 70 in region 150 flows primarily in the yarn guiding direction F or the opposite direction. Region 151 with a higher velocity 71 is mainly located on the yarn passage wall and is also guided in the yarn guiding direction F or the opposite direction. However, between the yarn passage walls in region 151, in the central region, the airflow is mainly at a lower velocity 72 or low velocity 73, which is guided in the yarn guiding direction F or the opposite direction.
[0098] Figure 5d It shows Figure 5aA side view of the nozzle flow velocity. In region 152 of the inlet, the airflow primarily flows towards the center of the yarn passage; that is, region 152 of high velocity 70 in the center of the yarn passage within the inlet region has a lateral component. In region 153, there are occasionally high-velocity flow vector regions in the lateral direction at the center of the yarn passage. However, these high-velocity regions are also increasingly guided along the wall opposite to the inlet in the direction of yarn guidance or the opposite direction.
[0099] Figure 6a An air inlet with a diamond-shaped cross-section without an air twisting chamber is shown to illustrate the effect of nozzle opening geometry on airflow.
[0100] Figure 6b A scale for the flow rate is shown.
[0101] Figure 6c The flow rate of the nozzle is shown in a top view. (Compared to...) Figure 5c In contrast, the diagram shows an inlet with a diamond-shaped cross-section that has a larger region 160 with a high flow velocity of 70, and the flow is more deviated from the filament guidance direction F or its opposite direction. Furthermore, compared to... Figure 5c compared to, Figure 6c The nozzle shown has a larger area 161 with a diamond-shaped air inlet, which has a relatively higher flow rate 71, and is also more guided in the center between the yarn channel walls.
[0102] Figure 6d Show Figure 6a A side view of the flow rate of the nozzle. Figure 6d It also shows a nozzle with a diamond-shaped air inlet having a larger region 163 with a relatively high velocity 71, which, in contrast to... Figure 5d The nozzle shown is more directed towards the center between the channel walls.
[0103] Figure 7a A prior art nozzle is shown, which has a circular air inlet and an air twisting chamber, the length of which is less than the chamber extension dimension.
[0104] Figure 7b A scale showing the flow rate.
[0105] Figure 7c Shown in top view Figure 7a The flow velocity at the nozzle is as follows: It can be seen that the flow has some regions 170 with high velocities, where the flow is transverse to the direction of the yarn guide. Outside the twisting chamber, there is a region 171 where the flow has a relatively high velocity 71 and is primarily along the direction of the yarn guide or in the opposite direction.
[0106] Figure 7d Shown in side view Figure 7aThe flow rate at the nozzle. Here, in the air inlet region 172, the flow is primarily guided in the transverse direction. In the small region 173 outside the twisting chamber, the flow has a high velocity and is guided in the direction of yarn guidance or the opposite direction.
[0107] Figure 8a A nozzle according to the invention is shown, which has an air twisting chamber, the length of which is 2.5 times the chamber extension dimension.
[0108] Figure 8b A scale showing the flow rate.
[0109] Figure 8c Shown in top view Figure 8a The flow rate of the nozzle. It can be seen that there is a large area of flow in the twisting chamber, which has a high-speed flow 71 guided in the transverse direction along the yarn guiding direction F, and a high-speed flow 71 guided in the yarn guiding direction F or the opposite direction in the center of the region 180 along the yarn guiding direction.
[0110] Figure 8d Shown in side view Figure 8a The flow velocity at the nozzle. It can be seen that in larger regions 182 and 183, compared to... Figure 7d The flow shown is more concentrated in the center between the two walls of the yarn channel, i.e., in the transverse direction of the yarn guiding direction F. The flow in region 183 near the air inlet has a high velocity 71, while the flow in region 182 has a slightly lower velocity 73. Therefore, there is less airflow in the yarn guiding direction F.
[0111] Figure 9 The airflow from various nozzles is illustrated in a side-by-side schematic diagram. The designation 80 indicates the airflow from a nozzle without an air twisting chamber, such as... Figure 5a As shown.
[0112] Mark 81 indicates an airflow from a nozzle with an air twisting chamber, the length of which is less than the chamber size, such as... Figure 7a As shown.
[0113] The reference numeral 82 indicates the airflow of a nozzle according to the invention, the nozzle having an air twisting chamber whose chamber length is 1.6 times the chamber extension dimension.
[0114] Reference numeral 83 indicates the airflow of a nozzle according to the invention, which has an air twisting chamber whose length is more than twice the chamber extension dimension. In Figure 80, the airflow is distributed such that a relatively small amount of airflow is concentrated in the center. Line 84 indicates that the increased chamber length results in an increase in flow oriented towards the center.
[0115] Figure 10A simplified cross-section of the yarn passing through the nozzle plate 10 along the yarn guiding direction is shown. The yarn channel 1 has an air twisting chamber 2 in the middle, and the air inlet 4 opens at an angle to the air twisting chamber in the yarn guiding direction F.
[0116] Figure 11a and Figure 11b Showing interlaced DTY yarn ( Figure 11a ) and interlaced untwisted yarn ( Figure 11b Examples of ).
[0117] Figure 12 and Figure 13 With similar Figure 1 and Figure 2 The illustration of the first embodiment is used to illustrate another embodiment of the nozzle according to the invention. The same reference numerals denote... Figure 1 and Figure 2 The same components are used and will not be described again. (And...) Figure 1 and 2 The embodiments described herein are the opposite of those described above. Figure 12 and Figure 13 The nozzles are designed to produce more and therefore less stable knots.
[0118] Channel sections 1a and 1b have an extension 21 of 1.7 mm in the direction of the drawing plane.
[0119] The air twisting chamber 2 has a chamber length 29 of 6.74 mm and a chamber extension dimension 28 of 2.0 mm in the yarn guiding direction F. The chamber extension dimension 28 and the chamber length 29 result in a length-to-extension ratio of approximately 3.37.
[0120] The walls of these chambers 2a and 2b are offset from the walls of the yarn passage at an angle of approximately 6°. This helps to generate numerous knots.
[0121] Figure 13 Shown from Figure 12 The air inlet 4 of the embodiment. A small portion of the cross-section of the air inlet 4 leads to the first chamber zone 2a.
[0122] The air inlet 4 has a kite-shaped cross-section with rounded corners and rounded boundaries in the chamber area 2a.
[0123] The air intake 4 has a width B of approximately 1.13 mm and a length L of approximately 1.1 mm, so the width-to-length ratio is approximately 1:1.
[0124] The kite-shaped structure has an asymmetrical structure: its length is 0.5 mm in chamber 2a and 0.6 mm in chamber 2b.
[0125] Utilize Figure 1The nozzle shown according to the invention was compared with nozzles known in the prior art (e.g., see WO2006 / 099763). Figure 14a In these tests, operating conditions (especially the amount of air at a given blowing pressure) were adjusted to obtain the most consistent counts and knot stability possible. Figure 14a and Figure 14b The number of knots in yarn (PES POY dtex 110 / 78f36) using a nozzle according to the present invention (X45.40) and a nozzle according to the prior art (P142) are shown respectively. Figure 14a ) and junction stability ( Figure 14b To achieve nearly the same number of knots and knot stability, the nozzle according to the invention consumes approximately 20% less air.
Claims
1. A cross-twisting nozzle (100) for producing knotted yarn, cross-twisted yarn, knotted DTY yarn, or untwisted yarn, comprising a yarn channel (1) with an air twisting chamber (2), wherein, The air twisting chamber (2) has an air inlet (4) for introducing air into the air twisting chamber (2), wherein the air twisting chamber (2) includes a chamber wall that widens when viewed along the direction of the yarn guide. The channel axis (Ma, Mb) extending along the direction of the silk thread guidance (F). The yarn channel (1) has a channel width (21) transverse to the channel axis (Ma, Mb), and The air twisting chamber (2) has a chamber length (29) along the yarn guiding direction (F) and a chamber extension dimension (28) transverse to this length, the chamber extension dimension (28) being wider than the channel width (21), characterized in that, The chamber length (29) is at least 180% of the chamber extension dimension (28).
2. The interlacing nozzle (100) according to claim 1, wherein, The length of the chamber (29) is at least 1.5 mm longer than the extension dimension (28) of the chamber.
3. The interlacing nozzle (100) according to claim 1, characterized in that, The width of the chamber extension dimension (28) is 15% to 45% wider than the width of the passage (21).
4. The interlacing nozzle (100) according to claim 3, characterized in that, The chamber extension dimension (28) is up to 5 mm wider than the channel width (21).
5. The interlacing nozzle (100) according to claim 1, wherein the chamber length (29) is at most 350% of the channel width (21).
6. The interlacing nozzle (100) according to claim 5, wherein the chamber length (29) is up to 30 mm greater than the channel width (21).
7. The interlacing nozzle (100) according to claim 1, wherein the chamber wall comprises at least one rounded wall segment.
8. The interlacing nozzle (100) according to claim 7, wherein, The rounded wall section has a radius between 0.3 mm and 6 mm.
9. The interlacing nozzle (100) according to claim 1, wherein, The chamber wall includes straight wall sections.
10. The interlacing nozzle (100) according to claim 1, wherein when viewed along the filament guiding direction, the chamber wall widens from the channel wall at an angle of up to 5° relative to the filament guiding direction and the channel wall.
11. The interlacing nozzle (100) according to claim 1, wherein, The air twisting chamber (2) includes a first chamber region (2a) and a second chamber region (2b), wherein the first chamber region (2a) is arranged first along the yarn guiding direction (F), and the second chamber region (2b) is arranged immediately after the first chamber region (2a) along the yarn guiding direction (F), wherein the air twisting chamber (2) has a contraction section (5) at the transition from the first chamber region (2a) to the second chamber region (2b), such that the chamber extension dimension (28) of the first chamber region (2a) and the second chamber region (2b) is greater than the chamber extension dimension (28) at the transition.
12. A cross-linking nozzle (100) for producing knotted yarn, cross-linked yarn, knotted DTY yarn, or untwisted yarn, said cross-linking nozzle (100) being the cross-linking nozzle (100) according to claim 1, comprising a yarn channel (1) with an air twisting chamber (2), wherein... The air twisting chamber (2) has an air inlet (4) for introducing air into the air twisting chamber (2). The channel axis (M) extends along the silk thread guiding direction (F), characterized in that, The cross-section of the air inlet (4) has at least one rounded arc section and at least one air guide section, wherein the air guide section is straight or its radius of curvature is at least 10 times the radius of curvature of the arc section.
13. The interlacing nozzle (100) according to claim 12, wherein, The air guide section is arranged at a certain angle to the channel axis (M).
14. The interlacing nozzle (100) according to claim 12 or 13, characterized in that, The air inlet comprises exactly four air guide sections arranged in a roughly rhomboid shape in cross-section, wherein the first line of symmetry of the rhombus is arranged parallel to the channel axis (M), such that the first corner of the rhombus points to the direction of the wire guide and the second corner points in the opposite direction to the direction of the wire guide, and the third and fourth corners are arranged opposite to each other in a common plane perpendicular to the first line of symmetry.
15. The interlacing nozzle (100) according to claim 14, characterized in that, The corners of the rhombus are rounded.
16. The interlacing nozzle (100) according to claim 12, wherein the air inlet (4) comprises a cross section having an opening length along the filament guiding direction (F) and an opening width transverse to the opening length, wherein the opening length is different from the opening width.
17. The interlacing nozzle (100) according to claim 16, wherein, The opening length is less than the opening width.
18. The interlacing nozzle (100) according to claim 16, wherein the opening width is less than the opening length.
19. The interlacing nozzle (100) according to claim 12, wherein The air twisting chamber (2) and / or the air inlet (4) are designed and arranged in the yarn channel (1) such that the air introduced through the air inlet (4) is guided to have a vector that has a transverse component to the channel axis (M) that is larger than the axial component along the channel axis (M) in the air twisting chamber (2) and an axial component that is larger than the transverse component outside the air twisting chamber (2).
20. The interlacing nozzle (100) according to claim 19, wherein the lateral component has a radial component that is larger than the tangential component.
21. The interlacing nozzle (100) according to claim 19, wherein the lateral component has a larger tangential component than the radial component.
22. A method for interlacing yarn, wherein the yarn is guided along the channel axis (M) of the yarn channel (1) of the interlacing nozzle (100) according to any one of claims 1-21, and the introduced air is introduced into the air twisting chamber (2) in the following vector, characterized in that, The vector within the air twisting chamber includes a transverse component that is larger than the axial component along the channel axis (M), and an axial component that is larger than the transverse component outside the air twisting chamber (2).