JPH0224937B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for producing bulky textured yarn by fluid injection processing of multifilament yarn, which has good entanglement between filaments, small uniform loops with excellent robustness, and mixed fibers with moderate sag. It is an object of the present invention to provide a processing method for producing a good bulky processed yarn with high efficiency. Yarns in which single filaments are entangled with each other through conventional fluid treatment are already known as so-called interlaced yarns, and a number of manufacturing methods and apparatuses have been proposed. These interlaced yarns are not intended for bulkiness, but are intended primarily to improve workability by eliminating defects (e.g., poor yarn unwinding, fuzz, etc.) in the weaving and weaving process or its preparation process. and
The aim is to intertwine each filament without creating loops or sag to obtain workability similar to that of true twisted yarn. It is also known, for example, from Japanese Patent Publication No. 37-1175, that in conventional interlacing devices, loops and curls occur when processing is performed under such a high overfeed rate that yarns become slack. However, such loops and creases that occur in the conventional method have a large net-like shape and belong to so-called fancy yarns, and furthermore, such loops and creases have extremely poor morphological stability (fastness) and are not suitable for practical use. It has many of the above problems. Therefore, such loops and curls are generally treated as defects in interlaced yarns. Next, regarding yarns with loops and slack,
BACKGROUND ART Many processing apparatuses and processing methods have been proposed to create loops and slacks in filament yarns by fluid jet processing for the purpose of making filament yarns spunlike. Generally, this type of processed yarn has large loops and many slacks, and therefore has common drawbacks such as poor yarn unwinding properties and a tendency to have a rough texture. As a solution to these drawbacks, it is considered effective to make loops and slack smaller, more uniform, and less. For this reason, twisting or twisting means are widely used in conjunction with conventional fluid jet processing to generate small, uniform loops, but such means have low productivity and are inevitably costly. In addition, when trying to reduce loops and slack, the entanglement of each filament with each other decreases, which leads to problems such as deterioration of the robustness of loops and slack, and a decrease in the fiber blending effect. Ta. The present invention was completed as a result of intensive research aimed at solving the problems of the prior art. In other words, the present invention aims to improve the entanglement property and the robustness of loops and slack by applying the action twice with the same jet flow, and by making use of extremely efficient fluids, it is possible to create bulky fibers with excellent mixing properties. The object of the present invention is to provide a method for producing processed yarn. The present invention has the following configuration to achieve the above object. That is, the present invention provides a tapered thread threading hole that gradually opens larger toward the exit side when performing fluid jet processing on a multifilament thread; Using a fluid injection nozzle having a fluid introduction hole with an angle α of 45 to 70° with the thread hole, the cross section of the yarn threading hole and the fluid introduction hole at the opening position of the fluid introduction hole to the thread threading hole. When the ratio is 1 or more, a vortex is generated, and when the cross-sectional ratio is less than 1, the angle α is reduced to generate a parallel flow, so that the thread passing through the thread passing hole is caused by a jet flow. After applying preliminary entanglement, the yarn is pulled out in a direction different from the fluid injection direction at the jet of the fluid injection nozzle and the yarn exit, and entangled again by the jet, and at the same time, the yarn is looped.
This is a method for producing bulky textured yarn, which is characterized in that it also causes sagging. Specifically, any single multifilament yarn can be processed depending on the contents of the filament yarn used (composition, physical properties, fineness, number of filaments, etc.), processing conditions (pressure, yarn speed, etc.), etc. ,3
When fluid processed at an overfeed rate of 5% or less, the individual single filaments that make up the multifilament are intertwined without forming loops or sag, and when fluid processed at an overfeed rate of 5% or more, loops or sag are formed. This is carried out by using a fluid injection nozzle such as Here, entanglement refers to a state in which the individual single filaments constituting the multifilament yarn are intermittently crossed or intertwined. With the above configuration, the present invention provides (1) a bulky textured yarn having small loops and slack with excellent uniformity. (2) Good robustness of loops and slack. (3) Since the filaments have good entanglement with each other, a processed yarn with an excellent blending effect can be obtained. (4) The number of loops and slacks can be easily adjusted and changed as necessary. In addition, due to the decrease in the number of loops and slack, the entanglement of the yarn is reduced.
The fiber blending effect is hardly reduced. (5) Due to the reasons (1) and (4) above, the unwinding property of the yarn is extremely good, and the processability of the yarn in the weaving and weaving process or its preparation process is extremely good. The present invention will be explained in more detail below. (1) The fluid injection nozzle opens at the inlet and outlet of the yarn, and the thread passing hole from the inlet to the outlet.
Using a closed nozzle surrounded by a wall except for one or more fluid introduction holes, fluid is injected from the fluid introduction holes of the nozzle, and the yarn is passed through the yarn facing the fluid introduction holes. The thread is pressed against the inner surface of the thread hole, and the thread is pre-entangled within the thread passing hole by the parallel flow, eddy current or turbulent flow generated against the inner surface. In this case, it is more efficient to generate a parallel flow or a vortex flow within the yarn threading hole. For example, the size of the fluid introduction hole opened in the yarn threading hole (the cross-sectional area of the portion 5 in Figure 1) should be smaller than the size (cross-sectional area) of the yarn threading hole at that position. Alternatively, by providing two or a plurality of fluid introduction holes as shown in FIGS. 1 and 2, it is possible to easily generate a vortex flow. Furthermore, even if the area of the fluid introduction hole at the opening position of the fluid introduction hole to the yarn threading hole is equal to or larger than the area of the threading hole, the angle formed by the threading hole and the fluid introduction hole By reducing (α in FIG. 1), parallel flow can be easily generated. In this case, the degree of entanglement at the yarn outlet can be made much stronger than in the preliminary entanglement. (2) The degree of pre-entanglement and the degree of entanglement at the yarn outlet can be selected as described above, but in normal usage, the angle between the yarn passing hole and the fluid introduction hole (α in Figure 1) is By setting the angle between 45 and 70 degrees, the effect of the previous stage can be provided in the thread passing hole, and at the thread exit, the thread is pulled down almost perpendicularly to the jet direction, as shown in Fig. 1. A jet stream acts on the side of the loop, allowing for efficient generation of re-entanglement and loop slack. By doing so, the actual feed rate of the yarn in the yarn threading hole is reduced by the jetting force of the jet from the yarn outlet, so that the thread inside the yarn threading hole is It is interlaced with almost no loops or sags, ensuring uniformity. (3) Furthermore, the thread passing hole of the nozzle is tapered to gradually open larger toward the exit side, and the cross section of the thread exit is made larger than that of the thread entrance, thereby reducing the speed of the jet flow. It is possible to prevent this and increase the contact time of the jet flow with the yarn, thereby increasing the effects of entanglement, loops, and sagging. (4) In addition, as described above, the multifilament yarn is overfed and supplied to the nozzle, and the yarn is guided in a direction almost perpendicular to the fluid jetting direction at the yarn outlet of the nozzle. The jet stream can be efficiently applied to the side surfaces. (5) As the overfeed rate of the fluid treatment zone increases, the amount of loops and slack will occur, and the entanglement will also improve; however, if it is too high, the yarn may sway significantly at the yarn outlet of the nozzle. As a result, the running condition of the thread becomes unstable, and the thread eventually blows out in the direction of the fluid injection, making it impossible to process the thread. Therefore, the overfeed rate must be appropriately selected in consideration of the desired loop, amount of slack, degree of entanglement, workability, etc. As described above, in the present invention, two threads are formed by the same jet stream.
Since it imparts a degree of action, it is possible to enhance the confounding effect of the filament very efficiently. For this reason, it is particularly effective when using a yarn with poor entangling properties such as a false twisted yarn. Processed yarns made by creating loops and slack in false twisted yarns have particularly excellent bulkiness, and there have been many proposals in the past, but all of these yarns have a higher level of bulk than those using raw yarns. It had the drawbacks of poor fastness of loops and slack, and poor intertwining and blending properties. The reason for this is that the filaments of the false twisted yarn do not have parallelism like the original yarn, and the opening properties of the filaments are extremely poor. For the purpose of these improvements, in the prior art, methods such as supplying low-crimp yarns that have been false-twisted with a low number of false twists have been used. According to the method of the present invention, opening, intertwining, and loop generation are effectively performed, so that ordinary false twisted yarn is supplied to provide loops and slack with high bulk and excellent robustness. , it is possible to easily produce processed yarn with excellent entangling and blending properties. FIG. 1 is a schematic vertical cross-sectional view showing an example of a fluid injection nozzle used in the method of the present invention, and FIG. 2 is a side view thereof. The yarn passing hole 2 is designed so that the cross-sectional area of the outlet 4 is larger than that of the yarn inlet 3. The fluid introduction holes 1, 1' are opened into the thread passing hole 2 so that the fluid is jetted out at an angle of about 65 degrees to the running thread. This angle (substantially the angle between the center line of the thread passing hole and the center line of the fluid introduction hole, α in the figure)
As it becomes larger, the jetting force at the yarn exit becomes weaker, making it impossible to obtain a uniform loop or slack.
On the other hand, as this angle becomes smaller, the preentangling effect decreases, and the entangling property, loops, and sag robustness decrease. Therefore, this angle has a limited range due to the relationship between the jet flow within the thread passing hole and the jetting force at the thread outlet. According to the inventor's experimental results, it is preferable to set the angle between 45 and 70 degrees. Next, two fluid introduction holes 1 and 1' are provided in order to effectively generate a vortex inside the thread passing hole. A part of the vortex is ejected from the inlet 3 of the thread passing hole, but most of it is ejected from the outlet 4. The cross-sectional shape of the thread passing hole does not necessarily have to be circular, and may have any shape as long as it meets the purpose of the present invention. The method of the present invention can be applied to both a processing method in which the supplied yarn is directly supplied to a fluid injection nozzle and fluid treatment is performed, and a processing method in which false twisting and fluid treatment are performed continuously in a series. In addition, one or more raw multifilament yarns and various processed yarns can be used as the supplied yarn. Next, a more detailed explanation will be given with reference to examples. Example: Polyester 150d/48f false twisted yarn and nylon 140d/48f false twisted yarn were aligned and supplied as the supplied yarn,
Fluid jet machining was performed using various fluid jet nozzles. The typical results are shown in Table 1.
The fluid treatment conditions were an overfeed rate of 5%, a pressure of 8 kg/cm ² , and a yarn speed of 200 m/min.

[Table] In Table 1, α is the angle formed by the thread passing hole and the fluid introduction hole, and the cross-sectional ratio is the value calculated by the following formula: Cross-sectional ratio = Exit cross-sectional area of thread passing hole / Yarn passing Cross-sectional area of the entrance of the thread hole The cross-sectional ratio is the ratio of the cross-sectional area of the thread passing hole to the cross-sectional area of the fluid introducing hole at the opening position of the fluid introducing hole to the thread passing hole (position 5 in Figure 1). That is, it is a value calculated by the following formula. Cross-sectional ratio = cross-sectional area of the yarn passing hole / cross-sectional area of the fluid introduction hole In addition, the entanglement property was evaluated by repeatedly subjecting the yarn to tension and relaxation several times and observing the convergence state of the yarn. , ○: Excellent, △: Slightly excellent, ×: Extremely poor. Furthermore, regarding the fastness of loops and sag, we evaluated those that had such fastness that the loops and sag were hardly eliminated during the weaving process, △ for those that were slightly eliminated, and × for those that were almost eliminated. . Experiment Nos. A, B, and C were conducted using the method of the present invention, and the resulting yarns had excellent workability, entangling properties, loops,
All have good sag fastness. Experiments No. C and D are examples in which a nozzle in which the size of the fluid introduction hole opened in the yarn threading hole is larger than the size of the yarn threading hole at that position (cross-sectional ratio <1) is used. In this case, good results were obtained by reducing the angle α to 50° (Experiment No. C). However, when the angle α was too small (15°), no good results were obtained (Experiment No. F). In Experiment Nos. E and H, the yarn was slack near the entrance of the yarn thread hole of the nozzle, and could not be processed. This is considered to be because the jetting force of the fluid in the thread running direction is too weak. Experiments No. G and H are examples in which a nozzle with a smaller cross-sectional area at the exit than the entrance to the yarn threading hole (cross-sectional ratio <1) was used, but good results were not obtained, especially when this cross-sectional ratio was extremely large. No loop yarn was obtained when the yarn was small (Experiment No. H). For the nozzles used in Experiment Nos. A to H shown in Table 1, the overfeed rate was 3% and the pressure was 6.
Fluid treatment was performed under Kg/cm ² and confounding properties were observed. The obtained textured yarn has no loops or sag at all, and this entangling property can be a measure of the pre-entangling effect of the fluid jet nozzle. As a result, the confoundability is bad for No.D and F (No.F is extremely bad),
The others were relatively good (No. E was the best).

[Brief explanation of drawings]

FIGS. 1 and 2 are schematic vertical cross-sectional views showing one example of a fluid injection nozzle used in the method of the present invention, and FIG.
2 is a fluid introduction hole, 2 is a yarn passing hole, 3 is an inlet of a yarn passing hole, 4 is an outlet of a yarn passing hole, and α is an angle between the yarn passing hole and the fluid introducing hole.

Claims (1)

[Scope of Claims] 1. When performing fluid jet processing on a multifilament yarn, a tapered yarn threading hole that gradually opens larger toward the exit side, and an opening in the yarn threading hole, Using a fluid injection nozzle having a fluid introduction hole with an angle α of 45 to 70 degrees with the thread threading hole, the connection between the thread threading hole and the fluid introduction hole at the opening position of the fluid introduction hole to the thread threading hole is When the cross-sectional ratio is 1 or more, a vortex is generated, and when the cross-sectional ratio is less than 1, the angle α is reduced to generate a parallel flow, and a jet is generated on the yarn passing through the yarn passing hole. After applying preliminary entanglement, the yarn is pulled out in a direction different from the fluid jetting direction at the jet of the fluid jet nozzle and the yarn exit, and entangling is again applied by the jet, and at the same time loops and slacks are also generated. A method for producing bulky processed yarn characterized by: 2. The method for producing a bulky textured yarn according to claim 1, wherein the supplied multifilament yarn is a false twisted textured yarn.