JPH0333236A - Alternate twister, alternate twisting method using the same and high bundling alternately twisted yarn - Google Patents

Abstract

PURPOSE:To obtain an alternately twisted yarn which has high bundling properties enough to be knitted or woven by making at least one of friction false- twisting disks locating downstream unequal in diameter and at least two disks at the upperstream equal. CONSTITUTION:A yarn Y is allowed to run through the central zone among shafts 1, 2 and 3 in the arrow direction, and these shafts 1, 2 and 3 are driven at the same speed with belts 15, 16 and 16'. Among friction flat-twisting disks, at least two at the upperstream are made equal in their diameter, while at least one at the downstream, unequal whereby the false-twisting action is varied.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a novel alternate twisting means. Furthermore, the present invention relates to a method for efficiently and stably producing a highly bundled alternately twisted yarn having excellent operability during knitting and weaving using this alternately twisting means, and a highly bundled alternately twisted yarn produced thereby.

[Prior Art] In order to perform knitting or weaving with good operability, it is necessary to impart cohesiveness to the threads. Twisting, gluing, interlacing, and the like have generally been used as means for imparting convergence.

Twisting is performed using twisting devices such as up twisters, ring twisters, and double twisters, but for example, when twisting 200 t/m, production can only be done at a low speed of 200 m/min or less, which is inefficient. There is a drawback.

The sizing method has the disadvantage that sizing requires high energy for subsequent drying of the yarn, and also has the disadvantage of low production efficiency due to low speed processing.

The entangling method allows processing at relatively high speeds, but has the problem that when imparting a high degree of convergence, it consumes a large amount of compressed air and also causes a decrease in the strength and elongation of the yarn. Also, 5
There is also the problem that it is difficult to obtain highly focused yarn at high speeds such as 00 m/min or higher, especially when the number of filaments in the yarn is 2 to 7.
When the amount is as small as , it is difficult to obtain a yarn with high entanglement.

Additionally, an alternate twisting method is also known as a means for imparting convergence, but the conventional alternate twisting methods include a method of applying a change in tension to the yarn using a normal false twisting device;
Method of changing yarn tension, yarn path, fluid flow, etc. using fluid false twisting means (Special Publication No. 39-128917, Japanese Patent Publication No. 40-1
4615, etc.), and with these conventional alternate twist imparting means, it was possible to obtain only alternately twisted yarns in which the twist density in the actual twist portion was low and the length of the zero twist portion was relatively long. Therefore, the conventional alternating twist imparting means could not obtain sufficient convergence and was not actually used as a convergence imparting means.

[Problems to be Solved by the Invention] Therefore, the main object of the present invention is to provide a novel means for imparting alternating twist that can obtain high enough convergence to be used in knitting and weaving, and also The object of the present invention is to provide a highly convergent alternately twisted yarn obtained by the method.

Further, the present invention provides an apparatus and method that can efficiently produce alternating twisted yarn with stable quality and high cohesiveness using simple and stable equipment and methods. In other words, even if high bundling property is imparted, the strength and elongation of the yarn does not decrease.
Moreover, it provides a convergence imparting means that enables high-speed machining.

In general, even yarns for which it is difficult to impart high cohesiveness through interlacing treatment, such as filament yarns with a small number of single yarns,
The object of the present invention is to provide a convergence imparting means capable of imparting high convergence.

[Means for Solving the Problems] In order to achieve these objects, the present invention has three or more parallel frictional false twisting plates that rotate at substantially the same speed that act on a plurality of rotating shafts to feed the yarn. are arranged in an order having
A circumscribed friction false twisting device in which opposing side portions of the frictional false twisting plates are located partially overlapping each other at a central portion between the plurality of rotating shafts, and the frictional false twisting plate is located at a downstream portion. Claim 1: An alternating twist imparting device, wherein at least one of the friction false twist imparting plates is a plate of unequal diameter, and at least two of the frictional false twist imparting plates located at the upstream portion are substantially equal diameter discs. 〉: The alternating twist imparting device according to claim 1, wherein the plurality of rotating axes are three axes substantially forming an equilateral triangle.Claim 2〉: The alternating twist imparting device according to claim 1 or 2 is used to produce fiber yarn. Alternate twist imparting method for imparting alternating twist to the strip (Claim 3): The number of false twists generated in the false twist imparting section on the upstream side of the alternating twist imparting device is 7000/ (5 (t/m
) or above (D is the denier of the yarn), the method for imparting alternate twists of the yarn according to claim 3 (claim 4); and: a filament yarn having alternate twists, the average number of twists in the alternately twisted portions; is 200/√D (t/m) or more (D is the denier of the yarn), and the average length of zero twist portions interposed at the boundaries of the alternating twists is 3 cm or less. (Claim 5)

The alternating twist imparting means of the present invention is basically a partially modified so-called external friction type friction false twist imparting means (e.g., 3-axis type or 4-axis type) that has been widely used in recent years for false twisting. It is what it is. That is, the alternate twisting device includes at least one of the frictional false twisting plates located in the downstream portion being an unequal diameter plate, and at least two of the frictional false twisting plates located in the upstream portion. Like the conventional circumscribed frictional false twisting device, the present invention is characterized in that it has a substantially equal diameter disk.

In addition, as for the method of applying alternating twist, using the above-mentioned alternating twist applying device, a false twisting action and a yarn feeding action are applied by rotating the equal diameter disc and the unequal diameter disc, and then the false twisting action is applied. It is sufficient to provide an effect of imparting alternate twist by rapidly changing the twist over time. In order to obtain a particularly high quality alternately twisted and highly focused yarn, the number of false twists generated upstream of the false twisting section must be
7000/700 (t/m) or more, especially 7000/700 (t/m) or more.
000/-n5 to 24000/F6 (t/m) (where D is the denier of the yarn) is preferred.

In addition, the resulting highly bundled alternately twisted yarn can have high binding properties that could not be achieved by conventional means for imparting alternate twist; The average number of twists in the twisted part is 200/ JT5
(t/m) or more (D is the denier of the yarn), and the average length of the zero-twist portions interposed at each boundary of alternate twists is 3 cm or less.

In the present invention, the unequal-diameter plate (hereinafter referred to as an "alternate twisting plate") used as at least one of the frictional false-twisting plates located downstream is capable of changing the frictional false-twisting effect within one rotation. It means a plate-like body whose radial length from the center of rotation axis changes continuously with rotation, for example,
Examples include non-circular disks, eccentric-axis disks, elliptical plates, and triangular or square plates with rounded corners as shown in FIGS. 3(a) to (h). In the case of elliptical plates as shown in Figures 3(e) and (f) or polygonal plates as shown in Figures 3(g) and (h), the degree of deformation does not necessarily have to be point symmetrical. , diversity is allowed depending on the alternating twist pitch, density, etc. When two or more alternate twist imparting plates are used, the shapes of the two or more plates do not have to be completely the same.

Due to these shapes, large and small false twisting effects occur once or twice or more within one rotation of the alternating twist imparting plate.
The twist pitch and twist density of the alternating twist or the length of the zero-twist portion (hereinafter simply referred to as the zero-twist portion) interposed at the boundary between the alternating twists changes.The major axis and minor axis of this alternate twist imparting plate change. The twist pitch of the alternating twist, the length of each unit of the alternating twist, and the length of the zero twist section vary depending on the size of the section and the degree of change thereof.

Although two or more of these alternating twist imparting plates may be provided in the downstream part of the apparatus, there is no point in increasing the number too much. Three pieces is most preferable. When using a plurality of alternating twist imparting plates, it is preferable to install the alternating twist imparting plates so that the fluctuations in the false twisting action of the plurality of alternating twist imparting plates are synchronized in order to further improve the alternating twist imparting function. It is also possible to apply a method in which the timing of the twisting action variation is shifted by a certain amount.

The value of the maximum radius (DI) in the long diameter part of the alternating twist imparting plate is substantially the same diameter as the substantially equal diameter disk (hereinafter referred to as the false twist disk) used in the upstream part (some size is allowed). On the other hand, the value of the minimum radius (DS) in the small diameter portion may be approximately the same as the distance (Da) to the center between multiple rotation axes (3 axes, 4 axes, etc.). It is preferable to make the distance smaller than the distance (Da) to the center, and the point is that the distance should be such that the threads do not substantially touch each other.

Further, the false-twisting disks used as at least two of the false-twisting plates located in the upstream portion are disks whose radial length from the center of the rotation axis is substantially the same in all directions, that is,
It means a disk made of a substantially perfect circular disk with the center of the circle as the rotation axis, and specifically, a false twisting disk similar to that used in a conventional circumscribed friction false twisting device is used. Bye.

It is desirable that the alternating twist imparting plate be disposed on the downstream side following the false twisting disk. In addition, when changing, conditions may be set so that yarn resistance does not increase and cause yarn breakage.

The distance between the false twisting disks and the alternate twisting plates (in the vertical direction) is
Although it is basically preferable that they are all uniform, it is also applicable even if they are non-uniform.

When using a 3-axis circumscribed friction false twisting device, the three axes are arranged parallel to each other and in a substantially equilateral triangle, as in the conventional 3-axis circumscribed friction false twisting device, and
The three axes may be rotated at substantially the same rotational speed.

On the other hand, an alternative to this is a four-axis circumscribed friction false twisting device in which the four axes are arranged parallel to each other and in a substantially square shape, or a circumscribed friction false twisting device using another number of axes. The number of shafts is not particularly limited because the device can also be used as an alternate twisting device by using an alternate twisting plate on the downstream side. From a practical standpoint, the number of axes is preferably about 3.4 or 5, particularly 3.

To arrange the false twist imparting plates so that yarn feeding action occurs,
Attachment of false twist imparting plates to multiple rotational shafts [The false twisting plates may be attached to the downstream side in sequence so that the rotational direction is the same as the rotational direction of each shaft. For example, when three axes rotate clockwise as shown in Figure 2, axis (1), axis (3), lN1 (2), axis (1),
The false twist imparting plates are installed on the downstream side in the order of... In addition, if the rotation of these three axes is reverse to the left, axis (1), axis (2), axis (3), axis (1), etc.
Attach the false twisting plates to the downstream side in this order. The arrangement order of the false twist imparting plates may be the same as that of a three-axis circumscribed friction false twisting device generally used in the friction false twisting method.

In this way, by sequentially providing one or more false twisting plates on each shaft and using at least two false twisting disks as upstream false twisting plates, stable false twisting can be achieved in the yarn. This is one of the extremely important aspects of the present invention, as it is possible to generate a stable yarn feeding action and at the same time to provide a stable yarn feeding action. In other words, generating a stable and appropriate amount of false twist and preferably applying stable yarn tension to the yarn stabilizes the alternating twist action by the downstream alternating twist imparting plate and improves quality. It is important to bring about the stability of the system and the stability of the operating condition.

The number of false twists by this false twist imparting plate is 7000/i.
(t/ff1) or more, even 7000/JT5~2
4000/JT5 (17m) is the best condition. If the number of false twists is less than 7000/ff (17 m), it is difficult to obtain a yarn with a sufficiently high twist density of alternating twists.
It is known to provide high focusing properties. On the other hand, 24000/
If the length exceeds JT5 (17 m), it is possible to obtain a highly focused alternately twisted yarn, but problems may occur due to yarn breakage or increased yarn torque during weaving (knitting stops due to knitting or knitting). This is not preferable because the frequency of occurrence of "ground defects" tends to increase and the stability during knitting and weaving decreases.

By using the above-mentioned alternating twist imparting means, a highly bundled alternately twisted yarn having excellent knitting and weaving properties can be obtained, which has high bundling properties that could not be obtained with conventional alternate twist imparting means. This high convergence is due to the average number of twists in the alternate twisting part being 200/
J'T5 (t/a+) or more and the length of the zero twist part is 3
It can be expressed in cm or less. Preferably, the average number of twists in the alternately twisted portion is 200/i to 1400/(5 (17 m),
Sarani Favorite Mashikuha 250/(100~1200/4/T5(
t/phantom, and the length of the zero twist portion is 2.5C111 or less. If the average number of twists is less than 200/ff (17 m>), the cohesiveness due to alternate twisting will be low and the cohesiveness will be insufficient for knitting or weaving.
If the length exceeds 5 (17 m), the convergence is good, but the change in appearance between the actual twist part and the zero twist part becomes noticeable, resulting in poor appearance of the resulting knitted product, and kinks may occur during weaving. This is not preferable because the troubles caused by the occurrence will increase.

The value of the average number of twists in the alternating twist portion indicates that the twist angle is within a substantially constant range for yarns of various denier. The twist angle may be approximately 0.4 to 2.8 degrees, preferably 0.5 to 2.4 degrees.

Other processing conditions when applying alternate twisting according to the present invention may be conditions similar to those for normal circumscribed friction false twisting processing. - Inside the membrane, the rotating circumferential speed of the false-twisting disc is 350 m/
minutes or more, and the ratio of yarn running speed to disk circumferential speed is 0.7
2.0, but other conditions may be set depending on the false twisting performance of the disk surface. Further, the false twisting tension is, for example, about 0.5a/d, and the alternating twisting tension is, for example, about 0.5a/d.
For example, it may be about 0.4a/d, but it may be
Conditions other than these can also be set within a range depending on the quality of the yarn to be produced.

Next, a diagram showing one embodiment of the present invention will be described.

1 and 2 0) to 2(c) show an embodiment of the alternating twist imparting device (triaxial type) of claim 1, and are a side view of the device and an alternating twist imparting plate, respectively. FIG. 2 is a top view (partially transparent) showing an overlapping state.

In FIG. 1, yarn (Y) supplied from above runs downward through the center portions of three shafts (1), (2), and (3). The three axes (1), (2), (3) are parallel to the block (17) and drive belts (15), (16), (16'
) so that they rotate at the same speed.

The rotation direction of each axis in this figure is the left rotation direction when viewed from the upstream side as shown in FIG. 2, and the false twisting plates are similarly arranged in a counterclockwise order from upstream to downstream. ing. That is, in order from upstream, the guide disk (4), the false twist disk (5), (6), (7), (8), (9), (10),
Subsequently, alternate twist imparting plates (11), (12), and (13) are arranged, and furthermore, after R, a guide disk (14) is arranged. Here, it is desirable that the guide disk (4) at the entrance section and the last guide disk (14) be disks made of a low-friction material. The number of guide discs may be one, but it may be two or three depending on the degree of rubbing.

[Function] Figures 2 (a) to Q9 show that the overlapping state of the alternating twist imparting plate changes sequentially with rotation at the central portion of the three axes. ,
(12) and (13) are the axes (3), (2), and (
1) and rotates in sync. In Fig. 2 (a), the longest diameter parts of the long ellipses of the alternating twist imparting plates (11), (12), and (13) are located at the center of the three axes,
This is the state in which the greatest false twisting and untwisting effects are exerted on the yarn. Figure 2 0 shows the state rotated by 45 degrees from Figure 2 (A), where the middle diameter parts of each oblong shape are gathered at the center of the three axes, and the false twisting and untwisting effects on the yarn are moderate. It is. Next, Fig. 2 0> shows a state rotated roughly 45 degrees, with the shortest diameter parts of each oblong ellipse gathered at the center of the three axes, and the alternating twist imparting plates (11), (12), (13) ), the yarn does not touch
This is the state where the false twisting and untwisting effects are the least.

That is, in this figure, due to the rotation of each axis, the assembled state of the alternating twist imparting plates (11), (12), and (13) at the center of the three axes is changed to 0) in Figure 2 by 1/2 rotation. →0→(c)→0→0〉, and as a result, heating in this part,
The untwisting action changes from large to medium to zero to medium to large. here,
When the heating and untwisting effects change from large to medium to zero, the number of false twists that have occurred becomes large, so a part of the false twists are used as the actual twist of the yarn (one twist of the alternate twist). It remains and is present in the yarn that is taken off. On the other hand, when the heating and untwisting effects change from zero to medium to large, the number of false twists that had occurred changes from small to large, so the twist in the direction opposite to the false twist in the downstream yarn becomes actual twist. (the other twist of the alternating twist),
It will be taken over.

The period of this alternating twist depends on the thread running speed and the rotation period of the alternating twist imparting plate, but in the present invention, since the rotation speed of the alternating twist imparting plate can be made high, the alternating twist period can be changed. , it becomes possible to make it sufficiently short.

In this way, in the alternating twist imparting means of the present invention, a circumscribed frictional alternating twist imparting section in which the false twisting action changes periodically is provided following the circumscribed frictional false twisting section, and the false twisting section is provided on the entry side yarn. is formed, and the exit yarn becomes an alternately twisted yarn.

Efficient and stable high-convergence alternating twist can be applied by the alternating twist applying means of the present invention by generating a stable false twisting part upstream of this false twisting/alternating twisting part.
This is because the temporary action can be changed in an extremely short period at the exit side. That is, in order to stably obtain a dense alternate twist, it is important to form a stable false-twisted part upstream of the alternate twist applying part. This makes it easier to make sudden changes in the number of false twists, and also makes it possible to change them stably, making it possible to stably create sufficiently dense alternating twists of 200/√D (t/m) or more. This makes it possible to grant. For this purpose, the number of false twists in the false twist part must be set to 7.
000/i (t/m) or more is preferable.

Since the density of alternate twisting is high and the alternate twisting period is short in this way, a yarn can be obtained in which the average length of the zero-twist portion is sufficiently short (3 cm or less).

Highly focused alternately twisted yarn having high twist density and short zero-twist portions is free from knitting defects and knitting interruptions due to knitting needle detachment and filament breakage caused by filament cracking (fiber opening) during knitting. It is extremely small and has excellent operability in weaving and weaving. In addition, even when weaving as the warp of a fabric, filament breakage is rare, and even if filament breakage occurs, the yarn has a high bundling property, so it is possible to continue weaving without magnifying the defects. The occurrence of knitted fabric defects and fjA weave interruptions is extremely low, and the yarn has poor weavability.

And especially, VR! To impart good cohesiveness even to 2 to 7 filament non-crimped straight yarns, which are difficult to impart high cohesiveness with conventional convergence imparting means such as 1 treatment and are prone to filament cracking. It is possible to obtain a yarn with excellent knitting and weaving properties.

FIGS. 3(a) to 3(h) are diagrams illustrating the shape of the alternating twist imparting plate (unequal diameter plate), and in the figures, the mark X indicates the center of rotation.

FIG. 3(a) shows a shape in which a part of a perfect circle (dotted line) is shaved off, and has a short diameter portion (19). Third
Figure (b) shows a shape that is a perfect circle, but with an eccentric rotation axis. FIG. 3(C) shows a shape in which a part of a perfect circle (dotted line) is the longer diameter portion (20). FIG. 3(d) shows a shape in which the diameter changes asymmetrically.

Figure 3(e) is an ellipse, with major diameter parts (20) and (20')
A shape having two each of short diameter portions (19) and (19') is shown. FIG. 3(f) shows an elliptical shape that is a combination of a semicircle and a straight line, with long diameter parts (20), (20'), short diameter part (19),
(19') and 2 of each are shown. This (e)
, (f), two cycles of alternate twisting are applied within one rotation.

FIG. 3(0) has a triangular shape with rounded corners, and can provide three cycles of alternate twist within one rotation. FIG. 3(h) has a square shape with rounded corners, and can provide four cycles of alternate twisting within one rotation. in this way,
If the number of alternating twist cycles that can be applied within one rotation is large, the alternating twist period can be made extremely short, but the shorter the alternating twist period, the lower the twist density of the alternating twist tends to be. In practice, it is difficult to make the alternating twist period extremely short under sufficiently high twist density conditions. The optimum alternating twist period and twist density may be selected depending on the intended use of the alternating twist yarn.

When the shape of the alternating twist imparting plate is symmetrical about the axis, it is preferable to adjust the dynamic balance by adjusting the thickness of the composite material or the like in order to suppress shaking during rotation.

FIGS. 4 and 5 are process schematic diagrams illustrating the process of applying alternate twists, and respectively show the process of applying alternate twists and the process of applying alternate twists following stretching.

FIG. 4 shows the basic form of the alternating twist imparting process of the present invention, in which the yarn (Y) is transferred from the raw yarn package (21) to the processing area by the yarn supply rolls (23) and (23'). Alternate twisting H@(
25), and the take-up rolls (27), (27
'), the alternately twisted yarn is fed to the winding section (28) and wound up. Here, a false twisting section (24) is formed on the upstream side of the alternate twisting device (25), and the yarn (Y') on the downstream side is taken off as an alternately twisted yarn.

FIG. 5 shows another application example of the present invention, and illustrates a processing method directly connected to the drawing of synthetic fibers. Undrawn yarn package (2
2), the undrawn yarn (Y) is transferred to the feed roll (31), (
31'), is supplied to a stretching zone (32), and is stretched between draw rolls (33) at a high speed corresponding to the stretching ratio. This drawn yarn is supplied to the processing area by a draw roll (33) and a separate roll (33'). This yarn is processed by an alternate twisting device (25) and then transferred to a take-up roll (27) and a separate roll (27').
), and is wound on a winding bobbin (29) via a traveler by a ring traveler twisting winding method. Here, a false twisting section (24) is formed on the upstream side of the alternate twisting device (25), and the yarn (Y') on the downstream side becomes an alternately twisted yarn and is wound up in the winding section. becomes.

FIG. 6 is a diagram schematically showing an alternately twisted yarn, in which a Z-twisted part (41), a twisted part (43), an S-twisted part (42), and a twisted part (43') are repeated in sequence. There is. Also, Figure 7 shows
It is a figure explaining the measuring method of the twist density (twist number>) of an alternating twist part.

Average number of twists (τ) of the intersecting Fi twist part in the alternately twisted yarn
is calculated using the following method. The number of twists in the actual twist section (Z twist section, S twist section) is measured 20 times each, a total of 40 times, and the average value (T t >) is determined.

On the other hand, the average length (M ff1) of the actual twisted part is determined separately. Then, the average number of twists (τ>) is calculated by τ-T/M (t/m).

Here, the average length of the actual twist part (M m) is the center of the zero twist part →
Z twist part → Zero twist part → S twist part → Zero twist part → Z twist part → Zero twist part → S
The length of two cycles of alternating twist centered on the twisted part → zero twist part is measured at 10 locations, the average length of one cycle of alternating twist (Lllll) is calculated from this value, and this value is compared with the separately measured length of the twisted part. It can be determined from the average length of the section (Kfil) as M=1/2-.

In addition, the average length (K) of the twisted part can be determined by observing with a magnifying glass, using an enlarged projection method, or by taking an enlarged photograph.
The length of the part) can be measured at 20 locations and then averaged.

Furthermore, the number of twists in the actual twisted part can be measured by attaching the yarn to the rotating shaft (46) and fixed shaft (47) of the twisting machine as shown in Figure 7, and using a magnifying glass to measure the number of twists in the twisted part closest to the rotating shaft ( 43) is fixed (for example, by inserting a pin (49) into the yarn), and after untwisting the real twist (41) on the rotating shaft side part, the twisted part (43') in the next position is untwisted. ), untwist the actual twist of this part (42) and measure the number of twists, then move the fixed point to the next twisted part (43'') and untwist the actual twist of this part (42).
) may be carried out by measuring the number of twists.

FIG. 8 and FIG. 9 illustrate a four-axis type alternating twist imparting device, and are a side view of the device and a top (partially transparent) view showing an overlapping state of the alternating twist imparting plates, respectively. .

In FIGS. 8 and 9, the rotation direction of each axis is the left rotation direction when viewed from the upstream side, and the arrangement of the false twisting plates is also as follows:
Similarly, they are arranged in counterclockwise order from upstream to downstream. That is, sequentially from the upstream, the guide disk (4), the false twist disk (
5), (6), (7), (8), then the alternating twist imparting plates (11) are arranged, and further after R, the guide disk (14)
are arranged. The alternating twist imparting plate (11) is the ninth
As shown in the figure, it is a plate of unequal diameter.

The alternating twist imparting means of the present invention can be applied to yarns made of a plurality of single yarns in general, and can be applied, for example, to imparting cohesiveness to ordinary filament yarns such as polyamide filament yarns and polyester filament yarns. It is also effective for yarns with a small number of single yarns.

The obtained alternately twisted yarn can be used in a wide range of applications requiring yarn bundleability, such as for knitting, knitting, and covering.

[Example] - Example 1 A 63-denier, 3-filament 6 nylon undrawn yarn was stretched using the method shown in Fig. 5 and then alternately twisted, and then wound at a twist rate of 14 t/m. I took it.

The stretching ratio at that time was 4.0 times, and the feed rate between the draw roll (33) and take-up roll (27) was 1.5%.
Moreover, the processing speed was 800 to 1000 m/min.

In addition, as an alternate twisting device, 3 shown in Figs.
Using a shaft-type device, a polyurethane rubber disk with an outer diameter of 51 mm was used as the false twisting disk, and the longest part radius (DI) was 25.5 mm and the shortest part radius (Ds) was 21 mm as the alternate twisting plate.
．． A 5 mm polyurethane rubber disk having the shape shown in FIG. 3(a) or (e) was roughly installed, and guide disks (4) located at the entrance and exit of the yarn, respectively;
As (14), a disk with a matte chrome plating surface and an outer diameter of 51 mm was used.

The processing conditions, processing characteristics, and processed yarn characteristics are shown in Table 1.

In addition, No. 13 shows the case where the film was stretched and then wound without being subjected to alternate twisting, with an actual twist of 14 t/m being applied (comparative example).

As can be seen from the results in Table 1, when the alternating twist imparting means of the present invention is used, the average length of the zero twist portion is 3 cm or less and the average number of twists <τ) of the alternating twist is 200/√D(t/ It is possible to obtain an alternately twisted thread (NO, 1 to 10) having a number of m) or more.

In addition, with the alternate twist imparting means of the present invention, it is also possible to produce a yarn having a slight alternate twist by selecting processing conditions.

・Example 2 Each of the 1q alternately twisted yarns produced in Example 1 was subjected to a rubbing device for evaluating the cohesiveness of the alternately twisted yarns, as shown in FIG.
By adding 1), the thread was rubbed under the condition of thread tension of 0.35 g/d, and after running for 5 seconds, it was stopped and the occurrence of filament sagging was measured by observation (measured 50 times with a thread length of 1 m), and the results were It is shown in Table 2.

In addition, in FIG. 10, the alternately twisted yarn (Y') unwound from the package (55) is
), then take-up roll (5B), (58'
) and was suctioned with a suction gun (59), but the filament sagging was observed using the measurement part (60).

In addition, as a non-crimp filament yarn when inter-knitting a non-crimp filament yarn and a covered elastic yarn made by double covering polyurethane elastic fiber (20 denier) with nylon 6 yarn (10 denier), Examples Pantyhose were manufactured by knitting leg portions using each of the alternately twisted yarns obtained in Step 1 and feeding 40 yarns.

The stoppage of knitting during knitting and the occurrence of knitting defects in the resulting leg knitted fabric were investigated, and the results are shown in Table 2.

As can be seen from the results in Table 2, the alternately twisted yarn of claim 5, which has high convergence, has a stoppage frequency during knitting.
This is dramatically reduced to less than 1/10 of that of real twisted yarn without alternating twist.
An excellent product was obtained with no knitting defects.

Furthermore, even in the case of yarns with light alternating twists (Nos. 11 and 12), the bundling properties were better than in the case of real twisted yarns without alternating twists, and a corresponding effect was obtained.

- Example 3 A 66 nylon undrawn yarn of 110 denier 10 filament was subjected to drawing-alternate twisting processing using the same device as in Example 1 to obtain an alternately twisted yarn.

In addition, the stretching ratio was 3.85 times, and the processing speed was 800 m/
, the number of false twisting discs in the alternating twisting device was increased to 5.
The disk rotation speed during processing was set to 5000 rpm (D/
Y ratio -1,41) and false twisting FA (1) temporary? !
i number (T> 3489t/a (T ・f hundred = 1
The test was carried out under the same conditions as in Example 1 except that the temperature was changed to 9120 t/m).

As a comparison, after stretching, instead of applying alternating twisting, a pressure air entangling process was performed to intertwine rl! ! The case where the yarn was wound with an ICF value of 26.7 was designated as No. 15, and the case where the yarn was simply wound up as a twisted yarn after stretching was designated as No. 16.

As is clear from the results shown in Table 3, N
The alternately twisted threads of O and 14 exhibited extremely high cohesiveness.

[Effects of the Invention] By using the alternating twist imparting means of the present invention, it is possible to obtain an alternatingly twisted yarn having a high bundling property sufficient for use in knitting, weaving, and the like. That is, 1 q of highly bundled alternately twisted yarns with excellent knitting properties, weavability, etc. can be obtained, and it becomes possible to put alternately twisted yarns into practical use as a yarn converging means.

Further, according to the present invention, with simple and stable equipment and method,
Alternately twisted yarn with stable quality and high cohesiveness can be efficiently produced.

Furthermore, according to the present invention, high convergence can be imparted without causing a decrease in the strength and elongation of the yarn unlike with strong air-pressure entangling treatment, and moreover, high convergence can be imparted at a high processing speed. It can also be made into a filament.

Note that even if only the alternate twisting means of the present invention is used, the twisted yarn, the alternating I
Sufficient focusing can be imparted as an alternative to conventional focusing means such as @ processing, but it is also possible to use it in combination with conventional focusing means.

[Brief explanation of drawings]

FIGS. 1 and 2 (A) to Q show an embodiment of the alternating twisting device according to claim 1 (three-axis type), and respectively show a side view of the device and a side view of the alternating twisting device. This is a top view (partially transparent) of the twisting plate. Figures 3 (a) to (h) show the crossed Ti twisting plate (unequal diameter plate).
It is a figure which illustrates the shape of. FIG. 4 and FIG. 5 are process schematic diagrams illustrating the process of applying alternating Ti twist, and respectively show the process of applying alternate twist, and the process of applying alternate twist following stretching. FIG. 6 is a diagram schematically showing an alternately twisted yarn, and FIG. 7 is a diagram illustrating a method for measuring the twist density (number of twists) of alternately twisted yarn. FIGS. 8 and 9 show other embodiments of the alternating twist imparting device (four-axis type), and respectively show a side view of the device, J3 and the upper surface of the alternating twist shaping plate (partially transparent). 10 is a diagram showing a device for evaluating the convergence of alternately twisted yarn. [Explanation of symbols] Y: Yarn, 1.2.3: Rotating shaft 4.14
: Guide disk 5.6.7.8.9.10: Equal diameter disk (false twisted disk)
11, 12.13: Unequal diameter plate (alternate twist imparting plate) 19
: Minor diameter part, 20: Major diameter part DS: Maximum radius Dl of minor diameter part = Maximum radius Da of major diameter part = Distance from the rotational axis to the center between the multiple rotational axes 24: False twisting part 25: Alternate twisting device Y ': Downstream yarn (alternately twisted yarn) 41.42:
Alternate twist part (S twist part, Z twist part, respectively) 43:
Zero twist part

Claims (5)

[Claims] (1) Three or more parallel frictional false twisting plates that rotate at substantially the same speed are arranged at least one on each of the plurality of rotating shafts in the order in which they have a yarn feeding action, and further, the plurality of A device for circumscribing friction false twisting, in which opposing side portions of the friction false twisting plates are located partially overlapping each other at the central portion between the plurality of rotating shafts, and the friction false twisting plate is located downstream of the friction false twisting device. Alternate twisting characterized in that at least one of the plates is a plate of unequal diameter, and at least two of the frictional false twist imparting plates located in the upstream portion are substantially circular plates of equal diameter. Granting device. (2) The alternating twist imparting device according to claim 1, wherein the plurality of rotation axes are three axes substantially in the shape of an equilateral triangle. (3) A method for imparting alternating twist, comprising imparting alternating twist to fiber threads using the alternating twist imparting device according to claim 1 or 2. (4) A claim characterized in that the number of false twists generated in the false twisting section on the upstream side of the alternate twisting device is 7000/√D (t/m) or more (D is the denier of the yarn). 3. The alternate twisting method described in 3. (5) A filament yarn having alternating twist, wherein the average number of twists in the alternating twist portion is 200/√D (t/m)
(D is the denier of the yarn), and the average length of the zero-twist portions interposed at the boundaries of the alternating twists is 3 cm or less.