JPH0415290B2 - - Google Patents

Description

[Detailed description of the invention]

(a) Technical Field of the Invention The present invention relates to a binding spinning device for producing a binding spun yarn consisting of a core fiber bundle without twist and wrapped fibers that are spirally wound around the core fiber bundle and binding. (b) Conventional technology and its problems In recent years, the bundled spinning method has been attracting attention as a new spinning method different from open-end spinning. The yarn forming principle in this binding spinning technique is considered as follows. That is, by twisting the drafted ribbon-like fleece, most of the fibers are twisted, but the fibers at both ends of the fleece are not twisted and tend to be free at the ends. Free fibers are generated by transporting these tip-free fibers separately from the twisted fiber bundle. The free fibers are integrated with the twisted fiber bundle, and as the twisted fiber bundle is untwisted, it becomes bound fibers and a bound spun yarn is formed. Therefore, a transport means for separating and transporting the tip-free fibers is important in this technology. Many proposals have been made for transfer means, such as aspirators, temporary twisting nozzles, roller surfaces, etc., but the simplest structure is the
There is a Numa suction tube described in the publication. This has a yarn passage hole through which the twisted yarn can pass in a straight line, and generates an air flow inside the yarn passage hole in the same direction as the passing yarn. Since this suction uses a suction flow, it has many advantages such as less internal airflow turbulence, stable fiber transfer, and low energy costs. If only using this method, the generation of free fibers was insufficient, and it was not possible to spin a bound spun yarn with practical strength. In addition, the method proposed in JP-A No. 58-191227 forms a horizontally long slit immediately after the draft roller, and installs a pneumatic tube with both ends of the slit larger than the central part, and actively removes loose fibers at both ends of the fleece. This is a method of transporting This pneumatic tube is sufficiently effective when the tension of the twisted fiber bundle is high, but when the overfeed rate is high, the twisting tension decreases and left and right meandering of the twisted fiber bundle is observed, causing the fleece Since loose fibers at both ends are rolled up, there is a problem in that sufficient bound fibers cannot be obtained. (c) Purpose of the present invention The present invention aims to improve the drawbacks of the above-mentioned prior art.
By using a specific transfer device in the bound spun yarn manufacturing equipment, it is possible to actively separate and transport the free end fibers and stably produce bound spun yarn with sufficient strength for practical use. A binding spinning device is provided. (d) Structure of the present invention In order to achieve the above object, the present invention consists of the following structure. ``In a binding spinning device that includes a draft roller section in which a metal roller and a rubber roller are nipped, a suction tube with a slit surface formed at right angles to the width direction of the fleece discharged from the draft roller section, and an air temporary nozzle, the suction A binding spinning device characterized in that a groove continuous from the inlet hole is formed at one end of the tube slit section on the metal roller side of the final draft roller with respect to the yarn axis. FIG. 3 shows an example of the binding spinning device of the present invention. The sliver 1 is drafted by a back roller 2, a middle roller 3, and a front roller 4, becomes a ribbon-like fleece, is discharged from the front roller, and is sucked into a suction tube 5. The suctioned fleece is twisted by an air temporary twisting nozzle 6 provided on the downstream side of the suction pipe, and the twisting caused by this twisting extends to immediately after the front roller nip point. Due to this twist, most of the drafted fleece is twisted, but the fibers at both ends of the fleece are not twisted and become free fibers. The loose fibers are twisted after being transferred into the suction tube, and as the fiber bundle is untwisted, it becomes a wrapped fiber whose surface is wound and bound. The bundled spun yarn thus formed is passed through a delivery roller 7 and wound into a winder 8. Figures 2A and 2B are examples of suction tubes used in the binding and spinning device of the present invention. A is a perspective view, and B is a longitudinal sectional view seen from the downstream direction of the yarn axis. The inlet hole 9 and the outlet hole 10 have a horizontally long oval shape,
A slit portion 11 is formed between the inlet hole and the outlet hole by sandwiching a straight line A-A' connecting the center of the inlet hole and the center of the outlet hole. Also, one end of the slit has a groove 1.
2 and 13 are formed, and this groove portion continues from the inlet hole 9 to the outlet hole 10 with substantially the same cross-sectional shape. FIG. 1 is a side view of the suction tube used in the binding and spinning device of the present invention when it is placed in the draft section, showing the flow of fleece discharged from the front roller and the flow of airflow generated by the suction tube. The front roller of this draft section is composed of a metal roller 14 and a rubber roller 4, and the rubber roller 4 is deformed by pressure and comes into surface contact with the metal roller. Also, since the angle θ between the straight line connecting the center lines of the metal roller 14 and the rubber roller 4 and the center line of the drafted fleece is set slightly larger than 90 degrees, the direction of the fleece discharged from the front roller is indicated by the arrow 16. It points downward like this. On the other hand, if the suction tube is installed so that the groove is on the metal roller 14 side and the negative pressure generator is connected to the outlet hole 10 side, the airflow sucked from the inlet hole 9 will mainly flow inside the groove with a large cross-sectional area. 17, which coincides with the fleece discharge direction. Therefore, the twisted fiber bundle 18 travels straight without being affected by the fleece discharge direction or the suction air current, but the free ends generated at both ends of the fleece travel in the same direction as the fleece discharge direction. The fibers travel along with the suction airflow, separate from the twisted fiber bundle, and are transported a sufficient distance to become free fibers. In addition, since the twisted fiber bundle 18 always passes through the slit that is perpendicular to the width direction of the fleece, even if the twisting tension decreases due to a high overfeed rate, the twisted fibers near the nip point The meandering of the bundle in the fleece width direction is regulated, preventing the free ends that should become free fibers from being rolled into the twisted fiber bundle, stably generating a sufficient amount of free fibers, and producing a yarn with sufficient strength. Obtainable. Next, the shape of the suction tube will be explained. The dimensions of the suction tube are 0.2mm to 5mm apart between the slits.
mm, and if the groove has a semicircular cross section, a diameter of 1 mm to 10 mm is preferably used. This is a value X determined by the relationship with the spinning count or the amount of fiber passing through, and the appropriate value is determined by experiment. Note that the diameter of the groove needs to be larger than the slit interval. The groove portion does not need to have a semicircular cross section, and may have a shape such as a horizontally long semi-ellipse, a rectangle, or a triangle. Further, the change in the width direction of the slit from the inlet hole to the outlet hole of the groove portion may be linear or curved. The maximum width of the slit portion is preferably at least 3 mm or more. The shapes of the inlet hole and the outlet hole are substantially determined by the shape of the groove.In order to fully exhibit the effects of the present invention, it is possible to generate more free fibers by making the inlet hole oblong. The exit hole preferably has a shape as close to a circle as possible for the purpose of integrating the twisted fiber bundle and the loose fibers. The length of the suction tube is approximately determined by the fiber length of the short fibers used. In other words, in order to thread the thread at the start of spinning without a seed yarn or without moving the nozzle, the distance between the final nip point of the draft zone and the twisting point of the temporary twist nozzle (the position of the compressed air injection hole) should be adjusted to The maximum fiber length of +10 mm or less is preferable. Further, in the present invention, it is preferable that the fiber passage holes such as the suction tube and the temporary twist nozzle are made of a wear-resistant material such as ceramic. (f) Effects of the present invention (1) A binding spinning device is constructed by arranging a nip roller, a suction pipe, and a temporary twist nozzle in sequence, and the fleece discharge direction is made at a sufficient angle to the yarn axis, and the discharge direction and suction pipe are By setting the direction of suction to be the same as that in which the suction occurs, it has the effect of actively separating loose fibers, so that a strong bound spun yarn can be stably produced. (2) By forming the slit of the suction tube perpendicular to the width direction of the fleece and close to the nip point, meandering of the twisted fiber bundle is prevented and sufficient free fibers can be obtained, resulting in uniform winding. Yarns with high overfeed rates can also be produced. (3) Since suction is actively carried out at the suction pipe inlet, there is less fluff that winds up on the rollers or scatters around the machine base, resulting in good operability. This will be explained below using examples. Example 1 In a binding spinning device having the configuration shown in Fig. 3, a suction tube as shown in Fig. 2 was used to make 100% polyester (single yarn denier 1.25 d, fiber length 44 mm).
50s, 30s, and 13s were spun using the suction tube dimensions and spinning conditions shown below.

【table】

[Table] When spun under the above conditions, the spinnability was good, and the yarn quality was sufficiently strong as shown in the table below.
There were no problems in the subsequent weaving process. In addition, the 50s and 13s yarns with a high overfeed rate had a uniform winding state and were similar to the high-twisted yarn of general ring yarns, making it possible to obtain a highly twisted yarn without additional twisting.

【table】 [Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the flow of fleece discharged from the front roller and the flow of airflow generated by the suction pipe when the suction pipe used in the binding spinning device of the present invention is arranged in the draft section. The figure is a schematic view showing a suction tube used in the binding and spinning device of the present invention, and FIG. 3 is a schematic diagram showing the configuration of the binding and spinning device of the present invention. 9... Entrance hole, 10... Outlet hole, 11... Slit portion, 12, 13... Groove portion, 4... Front top roller (rubber roller), 14... Front bottom roller (metal roller).

Claims (1)

[Claims] 1. In a bundling and spinning device comprising a draft roller section in which a metal roller and a rubber roller are nipped, a suction tube with a slit surface formed at right angles to the width direction of the fleece discharged from the draft roller section, and an air temporary nozzle, the suction A binding spinning device characterized in that a groove continuous from an inlet hole is formed at one end of the tube slit section on the metal roller side of the final draft roller with respect to the yarn axis.