JP2960802B2 - Method for producing composite entangled yarn - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a composite entangled yarn having a yarn length difference between yarns constituting the composite yarn and having entanglement and real twist.

[0002]

2. Description of the Related Art Conventionally, many methods for producing composite yarns have been proposed, and as the form of composite yarns, those based on a core-sheath structure predominantly dominate. The basis of these conventional composite yarn technologies is that the function of the yarn constituting the sheath and the function of the yarn constituting the core differ, and the former mainly focuses on the appearance, performance and feel of the fabric, and the latter mainly It is selected for the purpose of adjusting the feeling and the basic configuration of the fabric. Methods for producing these composite yarns have been proposed in, for example, Japanese Patent Publication No. 1-23576, Japanese Patent Publication No. 61-40778, and the like.

[0003] Although the composite yarns obtained by these conventional methods all have a certain effect and practicality, all of them are characterized by the combination of the characteristics of the individual yarns supplied as the composite yarn. However, there has been no proposal for a method of effectively obtaining the composite yarn aimed at by the present invention, maintaining its properties even after the next process, and producing a composite yarn having good processability. It is the current situation.

[0004] That is, the problem of various composite yarns obtained by the conventional method is that the characteristics of each yarn constituting the composite yarn are sufficiently considered, but the composite form is not. However, since it is only compounded by confounding, there are many compound spots due to fluctuations in the confounding state, and as a result, the compounded state becomes unstable due to the influence of tension and heat in the subsequent process, and as a result, it fully demonstrates its characteristics It was impossible.

On the other hand, JP-B-61-13009 and JP-B-3-2
Japanese Patent No. 3657 discloses a method for producing a composite yarn by performing an entanglement treatment while twisting two yarns, but the yarn length between two yarns constituting the obtained composite yarn is described. No difference,
No real twist could be applied in order to suppress loops and sagging of the spread portion which are observed in composite yarns having yarn length differences.

That is, in the composite yarn, when the fiber is mixed and entangled to increase the yarn length difference between the yarns in order to take advantage of the characteristics of the core-sheath structure, the yarn length difference becomes a loop or a slack. It is inevitable to remain. For this reason, there is a disadvantage that the process passability in the post-process is reduced, and these loops and slacks remain as they are even in the final product, which considerably lowers the quality. As described above, even if a sufficient yarn length difference is given, the yarn end result is not utilized, and on the contrary, it causes troubles and quality deterioration.

[0007]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, a composite structure having a yarn length difference can be easily obtained, and the characteristics of the composite yarn can be sufficiently maintained even in a subsequent process.
It is an object of the present invention to provide a method for producing a composite entangled yarn that can make use of its characteristics and has excellent processability.

[0008]

SUMMARY OF THE INVENTION The present invention provides at least two
The yarns are sent to the entanglement processing area at different speeds, and the supplied yarns are mixed to prevent the twist applied during winding from propagating.
It is another object of the present invention to provide a method for producing a composite entangled yarn, wherein the entangled yarn is wound while adding a real twist less than the number of entanglements.

Hereinafter, the present invention will be described in detail. Normally, entanglement is an essential element for maintaining the mixed form and improving the processability when mixing two or more yarns, regardless of the difference in yarn length. , Excessive entanglement destroys the properties of the composite yarn,
In the case of imparting a small amount of entanglement, there is a defect that it is difficult to obtain a composite yarn having a sufficient yarn length difference due to generation of loops and slack. Furthermore, the entanglement is easily disentangled by the tension and heat shrinkage force received in the subsequent process, and as a result, it is difficult to form a uniform entanglement in the longitudinal direction of the yarn, which has a problem in terms of quality. I have.

[0010] In the present invention, in order to solve such a drawback of the entanglement, the supply yarn group is mixed and entangled in a processing area where the upstream and downstream sides of the yarn path are separated by rollers, and then the twist is performed. By winding while adding the actual twist less than the number of entanglements without propagating to the entangled processing area, the loop that is likely to be generated in the composite yarn having a large yarn length difference due to the actual twist that is added almost uniformly in the longitudinal direction of the yarn It is possible to suppress the sagging, prevent the entanglement from disappearing in the subsequent process and prevent the composite yarn from becoming non-uniform, and produce a composite entangled yarn excellent in processability.

An important point in the present invention is that after the supply yarn group is mixed and entangled so that the twist applied at the time of winding does not propagate, winding is performed while adding actual twists less than the number of entanglements. For this reason, firstly, the entangled treatment area is not affected by the propagation of twist, the supply yarn is completely controlled in tension, and the fiber is entangled and entangled in a stable state, so that it is uniformly distributed in the longitudinal direction. Can be mixed and entangled. Second, mixed fiber,
Since the entangled composite yarn is given a real twist immediately after passing through the entangled treatment zone, the composite yarn after mixing and entanglement is not squeezed, and even if there is a yarn length difference between the constituent yarns, The real twist is given in a relatively stable state. As a method for applying the actual twist, for example, a ring twisted yarn winding mechanism may be adopted. Thirdly, if a pirn winding by a ring twist winding mechanism is employed as the actual twist applying method, a composite entangled yarn having a high speed and a stable winding shape can be obtained.

In the present invention, the reason why the number of actual twists to be added to the mixed and entangled composite yarn is smaller than the number of entanglements is as follows.

A composite yarn having a core-sheath structure in which there is a predetermined yarn length difference between the constituent yarns, and a entangled portion and a weakly spread portion having a strong binding force alternately exist in the longitudinal direction of the yarn due to mixing and entanglement. In order to fully demonstrate the combined effects of the constituent yarns,
An important factor is the ratio between the entangled portion and the spread portion. As described above, excessive entanglement increases the proportion of entangled portions and degrades the properties of the target composite yarn. In addition, a small amount of entanglement promotes the formation of a slack or a loop in the spread portion, and a composite yarn having a sufficient yarn length difference cannot be obtained. Usually, the composite effect is judged on the basis of the number of entanglements. The preferred number of entanglements varies depending on the target composite yarn, but is generally 30 to 100 yarns / m, particularly 40 to 70 yarns / m. It is said to be preferable for exhibiting the effect. The yarn length difference that can be imparted between the yarns constituting the composite yarn with this number of entanglements is usually limited to 10%, and beyond that, loops and sagging from the composite yarn obtained by blending and entanglement will occur. Protrudes, causing a significant impairment in the processability in the subsequent process, and also in the final product, loops and slack cause deterioration in quality.

In order to solve this problem, the present invention aims to obtain a composite entangled yarn having a large difference in yarn length by applying a real twist smaller than the number of entanglements of the composite yarn following the entanglement treatment. By providing a yarn length difference of up to 20%, which exceeds 10%, which has been considered impossible in the past, manufactures composite entangled yarns with a more suitable core-sheath structure that can maximize the characteristics of each yarn. It is possible to An important point of the present invention is that in producing a composite entangled yarn, the characteristics of the entanglement and the actual twist are combined and utilized.
The real twisted portion obtained by drawing and twisting has the same binding force as the entangled portion. However, excessive twisting improves the processability, but at the same time, eliminates the combined effect. On the other hand, when the actual twist is small, the binding force of the yarn group is reduced. Therefore, if a yarn length difference is provided between the yarns, a nep is generated due to squeezing of a guide or the like, and the quality is reduced. As described above, confounding and actual twisting have relatively similar effects and disadvantages.
By finding a good combination of the two, we have found that there are conditions that cover each other's shortcomings and maximize the combined effect.

That is, in the present invention, in order to eliminate the drawback of the entanglement effect, after the entanglement treatment, an appropriate actual twist is applied in a process continuous to the entanglement, whereby the yarn is added almost uniformly in the longitudinal direction of the yarn. A composite entangled yarn that suppresses loops and sag in composite yarns with a large yarn length difference due to the real twist effect, prevents non-uniformity of the composite yarn due to disappearance of entanglement in the subsequent process, and also improves processability. Can be obtained.
In summary, the present invention intends to impart a sufficient yarn length difference by blending and entanglement, and to suppress generated loops and slacks by real twisting.

As a result of intensive studies, the present inventors have found that, when the actual number of twists exceeds the number of confounds, the ratio of the constrained portion occupying in the longitudinal direction of the yarn increases, and the effect of the yarn length difference and the effect of compounding are significantly reduced. And found it unfavorable. The preferred number of actual twists is
It is about 1/2 to 1/3 of the number of confounds.

In the present invention, when the yarn length difference exceeds 20%, the above-mentioned effects are reduced due to the occurrence of a larger loop or slack, so that the yarn length difference is 20% or less, especially 15%.
% Or less is preferable. Further, when the yarn length difference is reduced, loops and slacks are reduced, and the bunching effect by real twisting becomes poor. Therefore, it is preferable to supply the yarn to the entangled treatment area so that the yarn length difference is 1% or more.

In the present invention, the yarn to be the supply yarn is a multifilament having substantially no real twist or having a low real twist of 30 T / M or less from the viewpoint of good blending and entanglement. Filament yarn is preferred.

As an apparatus used to carry out the present invention, as shown in FIG. 1, for example, a plurality of feed rollers 1 and 2 for feeding at least two supply yarns at a predetermined speed, and a plurality of supply yarns are provided. It is necessary to have a entanglement nozzle 3 for mixing and entanglement processing, a delivery roller 4 for feeding the entangled composite yarn to the twisting zone, and a winding section 5 with a twisting mechanism such as a ring twisted yarn.

Using the above-described apparatus, two yarns are supplied to the entanglement nozzle 3 while varying the speed of the feed rollers 1 and 2 so as to impart a yarn length difference between the supply yarns, and the yarns are applied at the time of winding. After imparting the mixed fiber and entanglement without affecting the twist, the yarn is wound by applying a real twist less than the number of entanglements via the delivery roller 4 at the winding section 5 with a ring twisting mechanism.
The composite entangled yarn aimed at by the present invention can be manufactured.

[0021]

Next, the present invention will be described in detail with reference to examples. Examples 1 to 3 and Comparative Example 1 Using the apparatus shown in FIG.
Of polyethylene terephthalate filament A and 55 d / 168 f of polyethylene terephthalate filament B to feed roller 2. At this time, the feed amount is increased by 15% from the yarn A so that the yarn B becomes a sheath yarn, and the yarn is mixed and entangled by the entanglement nozzle 3 having an air pressure of 3 kg / cm ² , and after passing through the delivery roller 4 The composite yarn was wound while adding a real twist in a winding section 5 equipped with a ring twisting mechanism to obtain a composite entangled yarn.

The obtained composite entangled yarn was woven using a warp and a weft, and a woven fabric was obtained through a final dyeing and finishing step. The properties of the obtained composite entangled yarn and woven fabric are shown in Table 1.

[0023]

[Table 1]

As is clear from Table 1, in the case of 80 T / M in which the actual number of twists exceeds the number of entanglements (Comparative Example 1), the number of twists is too large, and the form as a composite yarn having a core-sheath structure is impaired. However, the characteristics of the composite yarn cannot be exhibited in the fabric.

On the other hand, Embodiment 1 in which the number of actual twists is smaller than the number of confounds
The composite yarns of Nos. 1 to 3 all had a good form as a composite yarn, and the characteristics of the composite yarn were well exhibited in the fabric. Among them, 50T /
In the case of M (Example 3), the appearance of the fabric was slightly lower than that of Example 2. Conversely, those with 12 T / M in which the actual number of twists is less than 1/3 of the number of confounds (Example 1)
Had a slightly larger loop and sag than those from Example 2.

[0026]

As described above, according to the present invention, the blending, the entanglement processing and the addition of the actual twist less than the number of entanglements are performed in independent areas and continuously, respectively. It is possible to effectively hold and control loops and slacks. The effect is to stably produce a composite entangled yarn with a core-sheath structure that has a sufficient yarn length difference and is excellent in quality. You can do it.

[Brief description of the drawings]

FIG. 1 is a schematic process diagram of an apparatus used in a method for producing a composite entangled yarn of the present invention.

[Explanation of symbols]

 1, 2 feed roller 3 entanglement nozzle 4 delivery roller 5 winding part with ring twisting mechanism

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ identification symbol FI D02J 1/00 D02J 1/00 M (58) Field surveyed (Int.Cl. ⁶ , DB name) D02G 3/22 D02G 3 / 04 D02G 3/26 D02G 3/36 D02J 1/00 F-term theme code 4L036

Claims (1)

(57) [Claims] At least two yarns are sent out at different speeds to a entanglement treatment area, and the supply yarn group is mixed and entangled so that the twist applied during winding is not propagated. A method for producing a composite entangled yarn, comprising winding while twisting.