JP2000256929A - Spun yarn untwisting method and apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and an apparatus which untwist a spun yarn such as a cotton yarn or wool and wind it around a core yarn such as a water-soluble vinylon with high productivity and do not cause yarn breakage. SOLUTION: A core yarn 1 is pulled out through the center of a wound yarn body 2 on which a spun yarn 4 is wound, and the spun yarn 4 is rotated while rotating the wound yarn body 2 in a direction for untwisting the spun yarn wound thereon. Is unwound, and the unwound spun yarn 4 and the core yarn 1 having passed through the wound body are drawn out through the same yarn guide 5, and the direction of rotation of the wound body 2 is determined by the false twisting device 3 arranged on the drawing side. Then, the core yarn 1 and the spun yarn 4 that have passed through the false twisting device 3 are wound. Until passing through the false twisting device 3, the spun yarn 4 is not substantially untwisted, but is untwisted when passing through the false twisting device 3 and wound around the core yarn 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for winding a spun yarn such as cotton yarn or wool around a core yarn such as water-soluble vinylon while untwisting a twist given during spinning. It is about.

[0002]

2. Description of the Related Art Spun yarns such as cotton yarn and wool can be easily cut simply by drawing short fibers in parallel to form a yarn. Twisting is applied to the yarn during spinning, and the short fibers are entangled with each other. By binding the helical short fibers to each other, the strength as a yarn is imparted. Therefore, twisting is indispensable for spun yarn, and various types of yarn processing and weaving are performed while twisting is applied.

[0003] Spun yarns, in particular, natural spun yarns such as cotton yarns and wools, differ greatly in the texture of the woven fabric depending on the strength of twist. For example, a woven fabric containing spun yarn, which is referred to as non-twisted, having a low twist, has good water absorption, a large amount of air contained between the fibers, and therefore has excellent heat retention and a soft texture. For example, a towel using a non-twisted cotton yarn having a twist of only 30% or less of the twist given at the time of spinning as a pile yarn has a high water absorption and a soft touch. In order to obtain such a towel, it is necessary to untwist and weave the twist of the cotton yarn given at the time of spinning, but in the operation of simply untwisting and weaving the cotton yarn, the strength as a yarn is obtained. Weaving is not possible because of the inability to hold.

Therefore, when weaving a non-twisted yarn (which is generally called a non-twisted yarn including a yarn having a small number of twists. In this specification, the term "no-twist" is used to mean a yarn having a low twist), The untwisted spun yarn is wound around a core yarn, and weaving is performed in a state where the core yarn bears the strength as a yarn. For example, in the case of a towel using the above-mentioned untwisted pile yarn, the untwisted cotton yarn is wrapped around a water-soluble vinylon yarn and woven, and then the water-soluble vinylon yarn is dissolved off with water, so that only the untwisted cotton yarn is used. Manufactures towels with pile yarn. Other fibers can be used as the core yarn around which the untwisted yarn is wound. For example, it is possible to use a silk yarn as the core yarn and dissolve the silk yarn with a caustic soda solution.

In order to produce a fabric using non-twisted yarn by such a method, it is necessary to perform a yarn processing step of winding an untwisted spun yarn around a core yarn. A conventional typical method for doing this is to combine a spun yarn and a core yarn,
A method of untwisting the spun yarn by giving a twist in a direction opposite to the twisting direction of the spun yarn with a double twister or the like, and a method of winding the core yarn while untwisting the spun yarn and twisting.

[0006]

However, the former method has the following problems.
There is a problem that a difficult plying process is required, and troubles such as thread breakage are likely to occur when twisting the yarn depending on the plying content. In the latter method, the untwisting of the spun yarn and the laying of the core yarn are performed simultaneously, so that the process is simple. However, yarn contamination by the traveler is likely to occur, and the production efficiency is not very good. Therefore, it is difficult to produce high quality non-twisted yarn by the latter method.

SUMMARY OF THE INVENTION An object of the present invention is to provide a better method and apparatus for winding a spun yarn around a core yarn in a untwisted state and combining the yarns, and has a high productivity and generates spun yarn. An object of the present invention is to obtain the above-described method and apparatus.

[0008]

According to the present invention, a spun yarn 4 is provided.
The core thread 1 is pulled out through the center of the wound thread body 2 wound with
Unwinding the spun yarn 4 while rotating the wound yarn body in a direction for untwisting the spun yarn wound around it,
The unwound spun yarn 4 and the core yarn 1 after passing through the wound body are drawn out through the same yarn guide 5, and the core yarn passed through the yarn guide 5 by the false twisting device 3 arranged on the drawing side. 1 and a spun yarn 4 is provided with a false twist in the same direction as the rotation direction of the wound body, and the core yarn 1 and the spun yarn 4 passed through the false twist device 3 are wound up. The above object has been solved by providing an untwisting and twisting method.

According to a second aspect of the present invention, in the above method, the core yarn 1 is a water-soluble vinylon yarn, the spun yarn 4 is a cotton yarn, and the rotational speed of the wound yarn body 2 is wound around the spun yarn. 70 to 13 of the value obtained by multiplying the number of twists by the withdrawal speed
The rotation speed is 0%.

[0010] The invention of claim 3 is an invention of a spun yarn untwisting and twisting apparatus for performing the above method. The apparatus according to the present invention is provided with a hollow spindle 8, rotation driving means 9 for the hollow spindle, a ballooning guide 5 arranged on the axis of the hollow spindle, and a location farther than the ballooning guide 5 on the axis of the hollow spindle. Ta false twisting device 3
And a second rotary drive device 12 that can rotate this false twist device in the same direction as the hollow spindle 8 at substantially the same speed.

[0011]

The core yarn 1 is generally a filament yarn, and when producing a non-twisted cotton yarn or the like for a towel, a water-soluble vinylon yarn or silk yarn is used. The spun yarn is given a spinning twist, wound around a wound body (usually a bobbin), and supplied. The spun yarn drawn from the rotating winding body is given a twist correlated to the number of rotations, the drawing speed, and the circumferential length of the winding body. The total number of twists given to the yarn drawn out per unit time is the number of twists obtained by adding or subtracting the number obtained by dividing the drawing length by the circumference of the wound body to the number of revolutions of the wound body per unit time. Is divided by the length of the drawn yarn in the unit time, and the value is the number of twists per unit length given to the drawn yarn.

In the method of the present invention, since the winding thread 2 is rotated in a direction for untwisting the number of twists of the spun yarn wound on the winding thread 2, the spun yarn unwound from the winding thread is the same as that described above. Untwisting is performed by the number of twists determined by the calculation formula. For example, in the case of cotton yarn, a spinning twist of about 800 T / m is provided. Therefore, when the winding body 2 is rotated at a value obtained by multiplying the drawing speed of the yarn from the winding body by 800, the cotton yarn having almost zero twist number is obtained. Is obtained. To be precise, the value obtained by dividing the yarn withdrawing speed by the circumference of the wound body must be adjusted, but this value is negligible compared to 800 twists per meter. In general, in order to obtain the properties of a non-twisted yarn, a spinning twist of 30
% Or less, the number of rotations of the winding body 2 is 70 to 130 times the number of spinning twists times the yarn withdrawal speed.
% Rotation speed.

The spun yarn unwound from the rotating winding body 2 according to the above principle is untwisted. However, in the method of the present invention, the false twisting device 3 is used in the same manner as the winding body 2. Since the false twist is given by rotating in the direction, the spun yarn 4 is not substantially untwisted until it passes through the false twist device 3. Considering a state in which the winding body 2 and the false twisting device 3 are rotated at the same speed, the false twist is given by the false twisting device 3 by the amount of untwisting by unwinding from the winding body 2, so that the yarn is twisted. Guide 5
The number of twists of the spun yarn when passing through is approximately the same as the number of twists when wound around the wound body 2.

If the number of rotations of the false twisting device 3 is higher than the number of rotations of the winding body 2, the unwound spun yarn 4 passes through the yarn guide 5 in a state where the twisting (false twisting) is strengthened. That is, if the number of rotations of the false twisting device is reduced, the yarn will pass through the yarn guide 5 in the untwisted state by the reduced amount.

The spun yarn that has passed through the yarn guide 5 is wound around the core yarn 1 with a number of turns corresponding to the rotational speed difference between the winding body 2 and the false twisting device 3. The exact number of twists and windings must be adjusted by the number obtained by dividing the unwinding speed of the yarn by the circumference of the wound body to the number described above. The false twisting device 3 gives false twist to the core yarn 1 as well.

The false twist given to the core yarn 1 and the spun yarn 4 is untwisted when these yarns pass through the false twist device 3. That is, the core yarn 1 and the spun yarn 4 are
At the time of passing through, and the spun yarn is wound
Is wound around the core yarn 1 with the number of turns corresponding to the number of rotations. Assuming that the core yarn 1 is pulled out in this state,
What remains is untwisted spun yarn. The untwisted core yarn 1 and the untwisted spun yarn 4 wound therearound are wound around a bobbin, cheese, or the like.

According to the method of the present invention, when the spun yarn unwound from the wound body is ballooned, passes through the yarn guide 5 and passes through the false twisting device 3, the spun yarn is Twisting (false twisting) is provided, and thus, at these points, the spun yarn does not lose strength due to untwisting. If the strength decreases due to untwisting, it can be prevented by increasing the rotation speed of the false twisting device 3. Then, at the time of passing through the false twisting device 3, the false twist of the spun yarn 4 is released and becomes untwisted, the false twist of the core yarn 1 is released, and the untwisted spun yarn is wound around the untwisted core yarn. is there. That is, since the spun yarn is untwisted and wound around the core yarn in a state of no tension and no frictional force, there is no risk of yarn breakage or damage due to untwisting.

It is practically convenient to use what is generally called a false twist spinner as the false twist device 3. There are known false twist spinners having a well-known structure. However, a false twist spinner having a structure suitable for the properties of the yarn to be treated and not damaging the yarn may be selected.

[0019]

Embodiments of the present invention will be described below with reference to embodiments shown in the drawings. The device of the illustrated embodiment is:
Pan 6, wound with core yarn (water-soluble vinylon), pan 6
A tensioner 7 for applying a predetermined tension to the core yarn 1 unwound from the shaft, a hollow spindle 8 erected rotatably, a first drive belt 9 pressed against a driving cylinder 8a of the hollow spindle 8, a core yarn 1 And a ballooning guide 5 located above the axis of the hollow spindle 8, a ballooning guide 5 located above the axis of the hollow spindle 8, and a hollow spindle 8 located further above the ballooning guide 5 on the axis of the hollow spindle 8. A false twist spinner 11 rotatably supported around a coaxial shaft is provided, and a second drive belt 12 pressed against a drive cylinder 11a of the false twist spinner 11 is provided. / M of spun-twisted cotton yarn).

The core yarn 1 is unwound from the pan 6 to form a tensor 7, a yarn guide 10, and a hollow hole 8 of a hollow spindle 8.
b, it is pulled upward through the ballooning guide 5 and the false twist spinner 11. On the other hand, the spun yarn 4 is
After being unwound from, it is drawn upward through the ballooning guide 5 and the false twist spinner 11. The core yarn 1 and the spun yarn 4 drawn upward are wound on a winding bobbin via a traverser (not shown).

The first drive belt 9 rotates the hollow spindle 8 at a rotation speed obtained by multiplying the number of twists of the spun yarn by the drawing speed of the core yarn and the spun yarn. Second drive belt 12
Drives the false twist spinner 11 at a rotation speed 10 to 20% higher than the rotation speed of the hollow spindle 8.
The false twist spinner 11 shown in the figure has a structure in which two guide pins are provided inside a cylinder in a direction perpendicular to the rotation axis at an interval in a yarn passing direction, and the guide pins are bent on the two guide pins. False twisting spinner 11 for passing and passing yarn
Is transmitted. Although it depends on the structure of the false twist spinner, the rotation of the spinner is not always transmitted to 100% of the yarn, so the rotation speed of the spinner needs to be determined in consideration of the slip.

The relationship between the number of rotations of the false twist spinner 11 and the number of rotations of the hollow spindle 8 depends on conditions such as the structure of the false twist spinner, the number of twists given to the spun yarn, and the ease with which the yarn is cut when untwisting. It is necessary to select an optimum speed relationship in accordance with this, but usually rotation is performed at a speed difference in the range of constant speed or several tens of percent. When the twist direction of the spun yarn is the Z twist direction, the rotation of the hollow spindle 8 and the false twist spinner 11 is in the S twist direction.

Next, the state of the yarn at each point in the figure will be described. The core yarn below the false twist spinner 11 is given a false twist in the Z direction. The spun yarn wound on the bobbin 2 is twisted in the Z direction, and the spun yarn 4 during ballooning is untwisted by the rotation of the bobbin 2. Since the false twist is imparted by the spinner 11, little change in twist occurs. Ballooning guide 5 and false twist spinner 11
The core yarn and the spun yarn between them are given substantially the same twist in the Z direction, and the spun yarn 4 is rotated by the bobbin 2 and the number of false twists actually given to the yarn by the false twist spinner 11. Is wound around the core yarn 1 with the number of windings corresponding to the difference between.
In practice, the difference in the number of rotations is not so large that the spun yarn is hardly wound around the core yarn.

At the time of passing through the false twist spinner 11, the false twist given to the core yarn and the spun yarn is released, and both yarns are in a non-twist state. The core yarn 1 is wound in the S twist direction in the number of turns corresponding to (rotation / minute).

A towel is woven using the yarn thus obtained as a pile yarn, and after weaving, the core yarn (water-soluble vinylon) is dissolved in water and removed, so that a pile yarn consisting of only untwisted cotton yarn is used. A towel similar to woven is obtained. Since the yarn produced by the method of the present invention has no twist imparted to the core yarn, it is excellent in handling of the yarn during weaving and in processing property when eluting the core yarn.

[Brief description of the drawings]

FIG. 1 is a side view of an apparatus showing one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Core thread 2 Wound body 4 Spun thread 5 Yarn guide 8 Hollow spindle 9 First drive belt 12 Second drive belt

Claims (3)

[Claims] 1. A core yarn (1) is pulled out through the center of a wound yarn body (2) wound with a spun yarn (4), and the wound yarn body is untwisted. The spun yarn (4) is unwound while rotating in the direction of
And the core yarn (1) after passing through the wound yarn body are drawn out through the same yarn guide (5), and the core passed through the yarn guide (5) by a false twisting device (3) arranged on the drawing side. yarn
(1) and the spun yarn (4) are given a false twist in the same direction as the rotation direction of the wound body, and the core yarn (1) and the spun yarn (4) passed through the false twisting device (3). A method for untwisting and twisting spun yarns, comprising winding. 2. The core yarn (1) is a water-soluble vinylon yarn, the spun yarn (4) is a cotton yarn, and the rotation speed of the wound body (2) is controlled by the number of twists of the spun yarn wound therearound. The spun yarn untwisting method according to claim 1, wherein the rotational speed is 70 to 130% of a value obtained by multiplying the spun yarn by the drawing speed. 3. A hollow spindle (8), a rotary drive means (9) for the hollow spindle, a ballooning guide (5) arranged on the axis of the hollow spindle, and a ballooning guide (5) on the axis of the hollow spindle. A false twisting device (3) arranged at a position farther away, and a second rotary drive device (12) capable of rotating the false twisting device in the same direction as the hollow spindle (8) at substantially the same speed. Is a spun yarn untwisting device.