JP3046334B2 - Raw yarn for long and short composite processed yarn - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a mixed yarn of different denier spun fiber useful for long and short composite processed yarn.

Here, the “long and short composite processed yarn” means a composite yarn having a shape in which long fibers are mainly located in a core portion and short fibers are wrapped around the core.

(Prior art and its problems) Conventionally, various spinning methods of different denier spun mixed fiber using high-speed spinning have been proposed. In ordinary different denier spun mixed yarns, fine denier filaments are thick denier due to differences in cooling rate and spinning stress during structure formation during spinning.
It has higher orientation and lower elongation than filaments. When such a different denier blended yarn is false twisted, a fine denier filament having low elongation enters the center of the processed yarn,
The yarn form is such that thick denier with high elongation is wound around it (envelope). When this is made into a woven or knitted fabric, the ideal characteristics are far from ideal characteristics, in which there is no stiffness in addition to the rough feeling on the thick denier side. In order to eliminate the disadvantages peculiar to the spun mixed yarn, Japanese Patent Application Laid-Open No.
The different denier spun mixed fiber is drawn or drawn false twist,
By cutting only the fine denier filaments, it can be present as fluff on the yarn surface, and by positioning the thick denier filaments at the core, it is possible to obtain a processed yarn that satisfies both feeling and waist. It has been disclosed.

Here, a preferable composite yarn composed of the long fibers and the short fibers will be described with reference to FIG. FIG. 4 is a strength-elongation curve of a preferred multifilament yarn. Peak A indicates a fine denier filament component, and peak B indicates a thick denier filament component. Where A,
When drawing is performed at an intermediate ratio of elongation corresponding to the peak of B (for example, the drawing ratio of C on the horizontal axis in FIG. 4), fine denier filaments can be cut, and the fluff on the yarn surface Is formed, and a feeling like a spun yarn can be obtained. On the other hand, the thick denier filament is not cut and remains in a filament form to form a core, so that it can be made to have a waist, so that a long and short composite yarn satisfying both the feeling and the waist can be obtained. .

In order to develop a feeling such as spun-like tone, worsted feeling or refreshing feeling in such a composite textured yarn composed of long fibers and short fibers, the thickness of the fine denier filament is 1 denier or more. It is necessary to be. Therefore, it is necessary to make the thick denier side considerably thicker. However, in the combination of ordinary round cross sections, the difference in elongation between the thick and thin filaments is small, and it is practically impossible to cut only the fine denier side. further,
At the time of cutting on the fine denier side, the filament group tends to be cut at once collectively, and the resulting composite yarn is full of neps and cannot be put to practical use. From this point, it is necessary that the filaments are cut apart, so-called randomly.

(Purpose) The present invention solves the above-mentioned problems of the prior art, and
For long and short composite yarns that have a sufficient elongation difference even in the combination of fine denier filaments of denier or larger and filaments thicker than that, and that the fine denier side has random cutting properties. It is an object of the present invention to provide a useful different denier spun mixed fiber.

(Means for Solving the Problems) In order to achieve the above object, the present invention employs the following configuration.

1. Denier (D _A ) of a thick denier filament composed of filaments having substantially no thickness in the length direction
When, in denier fine-denier filaments (D _B) and the ratio of (D _A / D _B) is a different denier spun combined filament yarn which is 1 to 7, (a) fine-denier filaments than 1 denier, and (B) a difference in elongation between different denier filaments is 20% or more (however, the elongation of thick denier filament> the elongation of fine denier filament); Raw yarn for processed yarn.

 Hereinafter, the present invention will be described in detail.

The polymer used for forming the filament in the present invention is not particularly limited, but polyester is preferable from the viewpoint of feeling. Here, polyester means terephthalic acid as a main acid component and at least one kind of glycol, preferably an alkylene glycol selected from ethylene glycol, trimethylene glycol, and tetramethylene glycol. -Refers to a component as a component. Examples thereof include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyhexamethylene terephthalate and the like, and copolymers of these polyesters and isophthalate and the like, and these various polymers. And the like. Further, these polyesters may contain additives such as a matting agent, a stabilizer and an antistatic agent which are usually used.

In order to realize the feeling of worsted feeling or refreshing feeling intended by the present invention, the fine denier filament should have a thickness of 1 denier or more (the upper limit is usually about 2.5 denier). is necessary. On the other hand, in order to obtain a sufficient tension, it is desirable that the thick denier filament has a thickness 1 to 7 times that of the fine denier filament. When cutting only fine denier filaments is considered, it is preferable that the difference in elongation between the thick and thin filaments is as large as possible, and it is necessary that the difference be at least 20% or more (the upper limit is usually about 150%). However, even when spinning of the above-mentioned denier configuration is performed by a combination of ordinary round cross sections, substantially only one peak is seen in the strength-elongation curve of the obtained yarn.
It does not lead to a distinct elongation difference. The reason for this is considered to be that, for example, in the case of 1 denier or more, the crystallization behavior during the spinning does not greatly differ only by the fineness of the denier alone. Therefore, between the fine filaments 20
In order to have an elongation difference of not less than%, it is necessary to create a method in which fine denier filaments have a lower elongation than conventional round cross-section filaments, that is, a method of promoting crystallization. For this purpose, various methods have been studied. By changing the shape of the die, the performance is excellent, and the multi-lobing of the fine denier filament gives a difference in elongation between the fine denier filament and the thick denier filament. Found to be effective.

Further, a characteristic of the multilobe cross-section yarn is that it is extremely excellent in random cutting properties. The reason for this is not yet clear, but is presumed as follows. The point is that the contact area between the filaments is relatively small in a multi-lobe section as compared with a round section or the like. In other words, it is considered that since the round cross-section is a surface contact, while the multi-lobe is a point contact, the convergence between filaments is fundamentally low, and random cutting is possible. As a result, the yarn can be spun without any restrictions in terms of providing an oil agent and an air nozzle, and a yarn having random cutting properties can be obtained. For this purpose, the shape of the multilobe preferably has an irregularity (R / r) of 2.5 or more. Here, as shown in FIG. 1, R is the radius of the circle circumscribing the multilobe, and r is the radius of the circle circumscribing the multilobe.

The winding speed of the spinning may be set according to the physical property requirements of the final woven or knitted fabric. However, direct stretching during spinning, or passing through a spinning heating cylinder,
In addition, passing through a stretching heat treatment step according to these can be appropriately performed as needed. In particular, it is preferable to perform drawing with a low draft rate after applying the oil agent in order to dissolve a slight sticking between filaments. In addition, active generation of spots during the stretching step is one of the effective means for improving the random cutting property.

FIG. 2 shows an example of a spinning apparatus used in the embodiment described later. In the figure, a spinneret 1 (a multi-lobed discharge hole for a fine denier filament and a discharge for a thick denier filament) is shown. The filament 2 which is discharged from the hole (with a hole) is cooled by a cooling air device 3. Next, the filament that has passed through the oil applying device 4 under the air nozzle 7 is drawn between the Goded rollers 5 and 6 while the air nozzle 7 is being drawn.
, And further heat-treated by a Goded roller 6 and wound up by a winder 7. Here, the air nozzle 7 may be provided between the oil supply 4 and the Goded roller 5 or between the Goded roller 6 and the winder 7.

The mixed yarn of different denier spun yarn obtained by the above-mentioned steps is finely denier in a usual drawing device or drawing device.
The stretching of the filament and the random cutting can be performed without any trouble. The fluff due to the fine denier filament after cutting may be kept protruding from the processed yarn, or may be wound around the outer layer of the filament by a conjugating nozzle such as an interface or a swirling flow nozzle.

FIG. 3 shows an example of the traction device used in the embodiment described later. After the different denier mixed fiber 9 is cut between the feed roller 10 and the drawing roller 11, it is conjugated by the air nozzle 7 and then taken up by the take-off roller 12. After being wound, it is wound on a winder 14 via a guide 13.

(Action / Effect) As described above, the present invention utilizes the faster crystallization-promoting property of multi-lobal filaments and the point contact between filaments to make fine denier components of spun different denier mixed fiber. Is multi-lobed. As a result, in the resulting mixed yarn, the fine denier component exhibits a low elongation clearly distinguished from the thick denier component and a random cutting property. Accordingly, the woven or knitted fabric using the long and short composite processed yarns obtained in this manner has a soft feeling and a tightness at the same time, and is an extremely excellent woven and knitted fabric which has not been obtained in the past.

 Hereinafter, the present invention will be described with reference to examples.

<Measurement of strength and elongation> Using Tensilon (UTM-III) manufactured by Orientec, measurement was performed at room temperature under the conditions of a test length of 20 cm and a tensile speed of 100% / min.

Polyethylene terephthalate of Example 1 Intrinsic viscosity 0.64 - after melting bets (including 0.3 wt% of TiO ₂ as matting agents), thick denier - discharge hole Le filaments (round hole) 8 E - le, detail Denis The discharge hole (tri- or tetra-lobal hole) of the filament was discharged from the same base having 29 holes. After the discharged filament is cooled by the side-blowing cooling air, it passes through the oil dispenser and the swirling flow nozzle, and
After being stretched twice as much, it is heat-treated at 160 ° C and 3500m
Winded at a speed of / min. The wound different denier spun mixed yarn has a thick denier component of 4.5de x 8, and a fine denier component of 1.5
It consists of 29 de ×. Table 1 shows the results of examining the above steps with various bases. Good results were indicated by ○, defective defects were indicated by △, and poor defects were indicated by ×.

In the strength and elongation curve of the mixed fiber containing the fine denier component of the tri- and tetra-lobal cross sections, the peaks of the thick denier and the fine denier side are clearly separated, but are round, triangular and square. In each section, the elongation curve shows only one peak, and it can be seen that there is no clear difference in elongation between thick and thin. Further, the round sections have poor random cutting properties. Particularly, triangles, squares and the like have a large degree of surface contact between filaments, and the random cutting properties are even worse. On the other hand, the mixed fiber containing the fine denier components of tri- and tetra-lobal has extremely good random cutting properties.

Example 2 The raw yarn obtained in Example 1 was subjected to processing at a drafting magnification of 1.35 times, and the obtained processed yarn was knitted in a tube and dyed (Eastman polyester blue). Table 2 shows the evaluation results of the drafting workability and hand.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view of the degree of irregularity of a multi-lobal filament, FIG. 2 is a schematic diagram showing a spinning process of a mixed denier spun yarn of the present invention, and FIG. Fig. 4 is a schematic diagram of a drawing step of cutting a different denier spun mixed fiber of the present invention, and Fig. 4 is a strength-elongation curve diagram of the different denier spun mixed fiber. R: circumscribed circle radius, r: inscribed circle radius, 1: spinneret, 5, 6, Goded roller, 9: mixed denier spun mixed yarn, 11: pulling roll A, strength peak of fine denier component B: strength peak of thick denier component

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-124834 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) D02G 3/04 D02G 1/18 D02G 3 / twenty two

Claims (2)

(57) [Claims] 1. A consists filaments having substantially no FutoshiHoso lengthwise, the denier of the thick denier filaments (D _A), the fine-denier filaments denier (D _B)
The ratio of (D _A / D _B) is a different denier spun combined filament yarn which is 1 to 7, (a) fine-denier filaments at least 1 denier, and a cross-section multi-lobe, (b) The raw yarn for long and short composite processed yarn, wherein a difference in elongation between different denier filaments is 20% or more. 2. The cross-sectional irregularity of a fine denier filament (R /
The raw yarn for long and short composite processed yarn according to claim 1, wherein r) has a multilobe shape of 2.5 or more.