JPS6059139A - False twister - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a false-twisting device, and more particularly to a false-twisting device for producing high-speed, stable and high-quality false-twisted yarn.

In recent years, increasing the speed of false twisting has become important by making the drawing process of synthetic fibers and the false twisting process continuous or simultaneous. On the other hand, when performing high-speed temporary combustion processing, the spindle method has mechanical limitations, so the friction plate horse method is generally used. However, in the friction pre-combustion method, slip occurs between the friction disk and the yarn, and in reality, the actual number of twists is extremely low at about 50% of the theoretical number of twists. For this reason, conventional methods have been based on the approach of increasing the angle of incidence of the yarn with respect to the rotating disk, that is, making it closer to perpendicular. However, in this method, only one friction plate device (
Input tension (T1) of the friction unit (hereinafter referred to as friction unit)
The reality is that high-speed friction false-twisted yarn is a low-quality product commercially, as the twisting force (T2) increases and untwisting occurs frequently. On the other hand, if we take the opposite approach and reduce the yarn incident angle to the rotating disk, the yarn feeding effect of the friction unit will increase, the T2 tension will decrease, and the tension will become stable, but in reality This results in a processed yarn with a small number of twists and low crimpability, and its commercial use is limited. In other words, in the friction plate natural method, a technique for clarifying the relationship between the rotating disk and the yarn incidence angle has been a long-required problem in performing high-speed friction false twisting.

As a conventional example, West German Patent Publication No. 2310803 is known to show the relationship between the rotating disk and the yarn incidence angle, but this method simply makes the twist angle and the yarn incidence angle match. However, as the speed increases, slip will inevitably occur and the twist angle and yarn incidence angle will deviate, which is not realistic. Furthermore, JP-A No. 58-91834 describes a method of specifying only the diameter of the disk and the distance between the axes, but this method takes into account the thickness of the disk, the distance between overlapping disks, etc. As a result, the incident angle of the yarn is not only ambiguous, but also the slip between the rotating disk and the yarn, which has the most important effect on the quality of processed yarn, is not considered at all.

An object of the present invention is to provide a false twisting device which eliminates the above-mentioned λ defect of the prior art and obtains a false twisted yarn with stable quality and productivity.

The present invention relates to a triaxial circumscribed friction false twisting device (hereinafter referred to as a triaxial pre-twisting device) for false twisting thermoplastic synthetic fiber filament yarns, in which three wires rotating in the same direction and arranged approximately in parallel are used. This temporary device is characterized in that the discs are arranged on a rotating shaft and that the combined structure of the discs satisfies the following conditions.

≦65.0゜However, 3.0≦m≦20.0 (In the above formula, L is the disk radius (mu), M is the distance between the disks (
in), N is the distance between the axes (m-), m is the disk thickness (dragon) n
means the distance (dragon) determined from the maximum outer diameter of the disk end face and its radius of curvature. ) The present invention will be explained in more detail.

When applying false twist to running yarn using a circumscribed friction false twisting device, in order to insert a predetermined twist without imparting running resistance to the yarn, it is necessary to Theoretically, it is most preferable to apply an external force. Therefore, in friction false twisting, in order to effectively twist running yarns, it is necessary to apply a rotational force in a direction perpendicular to the yarn axis and at the same time apply a frictional force and a friction force to apply a running force in the yarn axis direction. It is better to apply speed to the yarn and make the resultant vector of both coincide with the twist angle. However, as the speed increases, the slip ratio changes depending on the material of the disk and the surface roughness of the friction surface, resulting in the generation of fluff and large fluctuations in the number of twists, resulting in an extremely unstable state. .

As a result of extensive studies based on this idea, the present invention has been developed to create a disc with a low slip ratio, a constant thickness, and sufficient frictional force in order to insert a predetermined number of twists into the running yarn. It has been found that an apparatus is effective in which the group is positioned perpendicularly to the rotation axis along the rotation axis so that the running yarn can take an appropriate angle with respect to the disk group.

Hereinafter, the present invention will be explained in more detail with reference to the drawings.

FIG. 1 shows a partial side view of the false twisting device of the present invention, in which disks 1.2 and 3 are sequentially attached to the three rotating axes A, B and C arranged substantially parallel to each other. has been done. Second
The figure is a schematic plan view illustrating the positional relationship of the disks in FIG. 1. In the figure, the thread is indicated by F, and in the above formula, the disc radius), M (distance between discs), m (disc thickness) N
(distance between axes, see FIG. 2) are shown in each figure.

Figures 3 (a) and (b) are diagrams for explaining the incident angle θ of the yarn in the above-mentioned false twisting device, and (a) and (b) respectively
1 is a perspective view of the disk showing the position of the yarn in contact with the disk 1, and (b) is a side view of the disk. In Figure 3, the point where the thread contacts the maximum outer diameter of the disk end face is 0.
, the tangent to the disk is ob, the direction of yarn entry to o is Oal, and the direction when this Oal is viewed from the side is O.
If a2, the incident angle θ of the yarn to the disk is ◇a2 and o
The angle formed by b is a2ob.

FIG. 4 is a diagram for explaining n in the above formula (the distance determined from the maximum outer diameter portion of the disc end face and its curvature), and shows an enlarged side view of the disc end face. In the figure, the above n is the curvature of the circle forming the maximum outer diameter part (c) of the end surface of the disk, and the line U extending from the top surface of the curved plate (the surface where the thread first contacts the disk). The intersection point is (d), and it is defined as the distance between the point (e) and (c) where a perpendicular line is drawn from this (d) and intersects with the maximum diameter.

In the present invention, the yarn incidence angle θ with respect to the rotating disk group is
Disc radius (L) and interdisc distance 11 defined as above
1t (M), the disc thickness (m), and the distance between the maximum outer diameter of the disc end face and its curvature (n), it can be determined approximately as shown in the following equation.

By setting the yarn incident angle θ obtained from the relationship of L% M, N% m, and n in the range of 35.0'≦θ≦65.0'', extremely high speed and stable processing can be achieved. , and high quality processed yarn can be obtained.

In the above relational expression, θ>65. In the case of Oo, the feeding action of the traveling yarn is reduced, so the running resistance increases, and the T2 tension of the false twisting device becomes too high, causing fuzz,
Problems with thread breakage occur. Also, θ<35. ”
When this occurs, the yarn feeding action is sufficient, but the friction speed for twisting becomes low, making it impossible to obtain the desired false twist.

As mentioned above, by specifying the range of the yarn incidence angle θ, high-speed stable false twisting becomes possible, but surprisingly, while satisfying the above yarn incidence angle, the disk thickness (m)
By keeping the value in the range of 3 to 2 (In or less), the slip fluctuation between the disc and the yarn is extremely stable, the occurrence of fuzz and yarn breakage can be prevented, and a twisting action close to the ideal can be provided. It was found that when the disc thickness m is 31mm, the slip between the thread and the disc is thick even if θ is within a satisfactory range Not only do uneven twisting occur frequently, but the number of twists also decreases, resulting in a loss of commercial value.

On the other hand, when the disk thickness m exceeds 20 fins, thread cutting occurs frequently due to the circumferential speed change between the point where the thread first contacts the disk at the end surface of the disk and the maximum diameter portion. Stable machining is 3.0≦m≦20
．． It is sufficient to satisfy the range of 0, but in order to reduce the slip between the yarn and the disk and obtain a highly crimped textured yarn, it is necessary to satisfy the range of 4.0.
It has been found that the range of 1≦m≦15 am is preferable.

Note that the range of the yarn incidence angle θ varies depending on the number of disks, the friction coefficient of the disks, the disk thickness, the type of running yarn, and the oil agent, so it is necessary to select it appropriately so that it falls within the above range. However, the preferred range of θ is 40.0°≦θ≦55.0''.In addition, due to the machine space, other elements are 10 (wealth -) ≦ L ≦ 40 (diamond), 0 .3
(mfi)≦M≦1.5 (m), 25.0 (Tsuru)≦N≦
It is preferable that the range is 80 (am), 0.3 (m++)≦n≦15 (Iris).

The yarn used in the present invention may be any filament yarn of thermoplastic synthetic fiber, and may be a drawn yarn, an undrawn yarn, or a monofilament. The present invention is particularly effective in increasing the speed of simultaneous stretching and false twisting.

As described above, according to the present invention, by defining the yarn incident angle θ and the thickness of the disk within a certain range, it is possible to produce a false twisted yarn with stable quality at high speed.

Next, examples of the present invention will be described.

Example 1 False twisting was carried out under the following common conditions and the conditions shown in Table 1 using a triaxial circumscribed friction false twisting device as shown in FIG. The results are shown in Table 2.

[Common conditions]

Supplied yarn: Polyester 150D-43F Heat treatment temperature: 220"C Processing speed: 500m/min Disc material: Polyurethane, hardness 95゜Number of discs: 3 for each shaft From the results in Table 2, experimental results 1 (comparative example) In 1), θ is 3
When the angle is smaller than 5.0°, a decrease in the number of twists and an increase in the slip ratio are observed, making stable processing impossible, and
0 (Comparative Example 2) is a case where θ is larger than 65.0°, but fuzzing and frequent untwisting spots due to increased T2 tension are observed. In addition, positive 14 (comparative example 3) and negative 16 (comparative example 4) are cases where the disk thickness m exceeds 20.011 @ and 3
．． The results are shown in the case of zero droplets, and in both cases stable false twisting could not be performed due to the generation of fuzz and cut threads. On the other hand, it can be seen that in Examples 1 to 14, in which the values of θ and m are within the specified range, the slip ratio is low, and processed yarns with very little fuzz and uneven untwisting can be obtained.

Margin below Table 1

[Brief explanation of drawings]

FIG. 1 is a side view of the main part of the false twisted yarn of the present invention, and FIG.
The figure is a schematic plan view of Figure 1, Figures 3 (a) and (b) are diagrams for explaining the relationship between the disc and the yarn incidence angle θ, and Figure 4 is a partial enlargement of the end face of the disc. FIG. Agent Patent Attorney Takenaga Kawakita

Claims (1)

[Claims] (1) In a three-axis circumscribed friction false-twisting device that false-twists thermoplastic synthetic fiber filament yarns, at least one sheet is attached to each of the three rotating shafts that rotate in the same direction and are arranged approximately in parallel. A false-twisting device characterized in that the disks are sequentially arranged around the three rotating shafts, and the combined structure of the disks satisfies the following conditions. ≦65.0゜However, 3.0≦m≦20.0 (In the above formula, L is the disk radius (m), M is the distance between the disks (+
+n), N is the center distance (m), m is the disk thickness (Tsuru)
n is the distance determined from the maximum outer diameter of the disk end surface and its curvature (
1111). )