JPS6056817B2 - spun yarn - Google Patents

Description

[Detailed description of the invention] The present invention relates to the structure of spun yarn.

In the history of the development of spinning technology, the ring spinning method has been the mainstream since its inception until the present day.

In recent years, innovative technologies such as open-end spinning, false twist spinning, and bundled spinning have been developed to dramatically increase the spinning speed compared to the ring spinning method. The spun yarns produced by these spinning methods can be broadly classified into Ξ types based on their structural differences.

The first type is ring-spun yarn, and as shown in Figure 1, the structure of the yarn is that most of the fibers that make up the yarn are in a parallel state, and the yarn as a whole rotates from one side. It has a structure of a single thread 1, which is generally called a single thread and is made into a real twisted thread. That is, in the above-mentioned ring spinning method, as shown in Fig. 1A, rotation 3 is applied to the fiber bundle from one direction of the fiber bundle 2 on the straight line to transmit the twist, so the fiber bundle is formed as a single structure. heated.

In this case, the thread draws a balloon with a radius determined by factors such as the rotation speed, the mass of the thread, and air resistance due to the high speed rotation of the traveler, and the centripetal force is generated according to the balloon diameter and rotation speed. Therefore, both ends of the fibers are heated in a state where they protrude everywhere, and fuzz 4 is generated, and the fuzz 4 is further promoted because the yarn is squeezed by the traveler.

Therefore, as shown in the yarn structure in the opening of FIG. 1, a single yarn-like real twisted yarn 1 with many fluffs 4 is obtained.

The second yarn has a yarn structure typified by a rotor-type open-end yarn or an adsorption-type heating method.

That is, FIG. 2A shows the rotor-type open-end spinning method and yarn structure. This involves twisting the fibers 7 that are being deposited in a state substantially parallel to the peripheral inner wall 6 of the rotating rotor 5. Therefore, when the fibers 7 are stretched in a straight line, as shown in the opening in Figure 2, the fibers 7 are twisted. The finished part A has a regular count fiber density, but the fiber density at the opposite end B is low, and the yarn is given a real twist while the fibers 8 are supplied to the entire circumference of the rotor.

Moreover, the direction of the supplied fibers is random, i.e.
The fibers are sprinkled and heated, so the core fibers are heated strongly, and the fibers on the outer surface are not twisted all the way to the inside, making them loosely twisted, like ring-spun yarn. It is impossible for the fibers to be heated together in a parallel state. Therefore, the last sprinkled fibers are called wrap fibers 10, which are bridge fibers that are simply wrapped around the outside of the yarn.

That is, these fibers are not arranged in the twisting direction of the yarn, and are entangled with the yarn in a tangled manner, which not only impairs the appearance of the yarn, but also causes a decrease in strength and fuzz.

The third yarn is what is called false twisted spun yarn or bound spun yarn shown in Figure 3 A and C, and is disclosed in Japanese Patent Application Laid-Open No. 56-797.
28. It is described in each specification of Japanese Patent Publication No. 52-4325 Maki.

That is, 80 to 90% of the main fibers constitute the main part of the yarn as fiber bundles 11 in which the fibers are parallel to each other, and by wrapping a very small number of fibers 12 around the outside and tightening the parallel fiber bundles 11. This is what gives the warp yarn its strength, and the spinning principle is as follows.

That is, while feeding the stable fiber bundle drafted at a high magnification from the front roller, false twisting is applied below the front roller, the heating effect due to the false twisting is propagated to the vicinity of the front roller, and the majority of the fiber bundles are A heating fiber bundle made of table fibers is formed, and the heating fiber bundle is not substantially twisted in the surface layer or near the outer periphery of the heating fiber bundle, or even if it is twisted, the amount of twisting is limited. A small number of stable fibers, such as small ones, are generated, and then, as the heated fiber bundle is untwisted, the small number of stable fibers 12 are automatically formed around the fiber bundle 11, which becomes substantially untwisted. The spun yarns 13, 14, and 15 are formed by winding the spun yarns in a random or spiral shape and bundling them.

Therefore, if stable fibers are simply wound around a parallel fiber bundle, the yarn strength will inevitably be weak.

The present invention reduces the drawbacks of the above-mentioned spun yarns and provides a spun yarn obtained by a spinning method different from the above-mentioned spinning methods. The bundle of fibers instantly creates an open-end state at a certain point on the straight line where it is directly fed out, without a body, and the yarn that is formed has a real twist, and even though it is a single yarn, it has an appearance. The present invention provides a spun yarn that has a twin-filament shape, has extremely short fluff, and has a certain directionality in the fiber ends coming out of the yarn.

The yarn structure will be described in detail below along with examples of the apparatus for obtaining spun yarn of the present invention.

In FIG. 4, the sliver 17 supplied from the bobbin 16 is drafted to a set draft rate by a draft device consisting of a back roller 18, a fluorocarbon 19, and a front roller 20, and then passed through a first fluid swirl nozzle 21 and The thread 23 is passed through the second fluid swirl nozzle 22, and is drawn out by a drawing roller 24 and wound onto a winding bobbin 25 by a known winding device.

Fluid ejection holes 26 and 27 are bored in each nozzle of the two fluid swirl nozzles 21 and 22 so as to generate swirling fluid flows in mutually opposite directions.

Although any gas can be used as the fluid, compressed air, which is easily available, is sufficient. The first fluid vortex nozzle 21 causes the end of the thread to be in an end-open state, and the second
The fluid swirl nozzle 22 imparts twist to the yarn.

Due to the swinging action of the balloon 28 generated by the nozzle 21, the sliver 17, which has been made flat by the front roller 20, is twisted vertically and horizontally, thereby acting to break the connection between the fiber and the thread. Due to this open-end formation, the false twist imparted to the yarn by the second fluid swirl nozzle 22, that is, the false twisting device, escapes, and the amount of the escaped twist remains in the yarn as actual twist.

Creating an open end between the front roller 20 and the first fluid swirl nozzle 21 will be described in more detail.

That is, in FIG. 6, the heating part a is rotated in the opposite direction,
The rotational force of the heating section b is made slightly stronger than the rotational force of the heating section a so that the twist is always propagated to the fiber bundle leaving the front roller 20 to form a yarn. A yarn balloon or other means, such as a high-speed vibrator, is applied to the yarn between the front roller 20 and the heating section a to forcibly bring a part of the fiber bundle into the cutting state C.

That is, at an instant, a certain percentage of the fiber bundles are cut C, and at the next moment, the fiber bundles are connected, and the remaining fiber bundles are cut, and so on. Fiber bundles in an open-end state are generated intermittently, and therefore, after passing through the heating section b, the yarn d remains with actual twist corresponding to the amount of twist escape due to the open end. In this way, a yarn 23 is formed in which the real twist in a certain direction is inserted up to the center.

In addition, in FIG. 4, both nozzle passages 29 and 30 are shown as simple cylindrical passages.

Due to the shape of the passages 29 and 30, the balloon generated by the nozzle 21 is caused by the diameter of the passage 29.
The balloon generated by the passageway 30 is restricted by the passageway 30. Therefore, stabilization of the balloon 31 is important in order to form an open end at least in the balloon region 28.

That is, one embodiment of a nozzle structure for stabilizing the balloon 31 is shown in FIG. That is, in the nozzle 32, throttles 33 and 34 are provided on the input and exit sides of the yarn. The aperture diameter of the aperture 34 is made smaller than the diameter of the thread passage 29, so that even if the diameter of the balloon 31 shown in the embodiment shown in FIG. The balloon 28 can be stabilized without any problems. FIG. 7 shows the structure of a spun yarn 23 obtained by applying such a nozzle 32 to the embodiment shown in FIG.

In other words, it has a structure that looks like a double yarn made of two yarns Ya and Yb twisted together, and has a completely different appearance from the rotor-type open-end yarn and bound spun yarn described above. The length of the fluff 36 is also short, and the number of fluff is dramatically reduced compared to the generation of fluff due to circular force as in the case of a ring yarn having a single yarn structure.

In addition, there is no difference in the twist angle between the core and the outer periphery as in rotor-type open-end yarn, and the yarn has a structure in which actual twist is applied in one direction up to the center of the yarn. Furthermore, in the open end part, the fiber end C1 on the front roller side is open until it is not bundled, so a small number of fibers that are not twisted into the yarn C2 on the nozzle side become fluff 36. The direction of the fluff 36 becomes constant as shown in FIG.

In other words, the direction of the fluff substantially coincides with the spun yarn traveling direction 37, and from this fact, it is possible to unwind the yarn from the doffed package and rewind it, or to use it directly in a loom or knitting machine as a yarn guide. It is resistant to the straining action of threads and is effective in preventing thread breakage. As an example, Table 1 shows the properties of various yarns of ester (65)/cotton (35) with a count of Ne45.

As is clear from the above table, the yarn strength is almost the same as that of the ring yarn, and the number of fluffs generated in 3wn is 16.7 per 10 m in the yarn of the present invention, which is significantly reduced compared to 123 per 10 m in the ring yarn.

Regarding the ironing strength, ring yarn breaks after 6 to 12 ironings regardless of direction, but in this application, the yarn runs in the direction of arrow 37 in Figure 7, that is, in the spinning direction. It shows that it is no different from a ring thread in terms of squeezing when the thread is pressed, but it is extremely strong in terms of squeezing in the opposite direction 38. That is, as mentioned above, this is due to the directionality of the fluff. As described above, the spun yarn of the present invention has double-filament real twist as a whole, the core and outer fibers are twisted at the same angle, and the fiber ends protruding from the yarn are in a fixed direction. Because of this, it has the appearance of double yarn even though it is a single yarn, and the friction on the surface of the yarn is also higher than that of conventional ring yarns, so when it is made into a woven fabric, slipping between the yarns is less likely. It is particularly effective for thin fabrics.

In addition, with ring yarn, the thick part has a gentle twist and the thin part has a strong twist, making the appearance thick and thin even more emphasized, but the thread of this application has a low U%, has a uniform appearance, and is well-balanced. It's also expensive.

Furthermore, since it is a double-stranded real twisted yarn, it has a silky feel when made into a fabric, and has a hemp-like texture.

In addition, because the twisted structure is double thread-like, the fabric has a stiffness and has various effects such as pilling resistance and wash-and-wear properties.
It is applicable as a yarn for a wide range of clothing.

[Brief explanation of the drawing]

Figure 1 is a diagram showing the principle of the ring spinning method and the yarn produced.
Figure 2 is a diagram showing the principle of the rotor type open-end spinning method and the yarn produced, Figure 3 is a diagram showing the structure of the bound spun yarn,
FIG. 4 is a schematic configuration diagram showing an example of an apparatus for producing the yarn of the present invention, FIG. 5 is a cross-sectional view showing an embodiment of the first fluid swirl nozzle, and FIG. 6 is a drawing of the spun yarn of the present invention. An explanatory diagram showing the principle,
FIG. 7 is a diagram showing the structure of the spun yarn. 23...Spun yarn, 36...Fuzz, Ya,
Yb...Bifilamentous part.

Claims (1)

[Claims] 1 The yarn as a whole has a real twist, the fibers located in the center of the yarn and the fibers located on the outer periphery of the yarn have the same twist angle, and the direction of the fiber ends protruding from the yarn is in a constant direction. A spun yarn characterized by having a double-filament appearance even though it is a single yarn.