JPS6385131A - Special blended yarn - Google Patents

Abstract

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

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to synthetic fibers mainly composed of polyester fibers, and relates to bulky yarns for feminine style and clothing and a method for producing the same. Specifically, it relates to a composite mixed fiber yarn characterized by a mixture of three types of fibers: two types of fibers having different shrinkage and latent crimpable flat fibers made by laminating different polymers. .

<Conventional technology> Conventional methods for obtaining bulky yarns and special drawn yarns with a silk-like texture include a method of spinning and blending different shrinkage fibers, a method of blending fibers during drawing and twisting, and a method of composite spinning. It is publicly known.

However, the above-mentioned method of spinning and blending the differently contractible Ill fibers is difficult to obtain sufficient bulk, and the above-mentioned twisting blending method causes many troubles in the spinning process and has both advantages and disadvantages. Furthermore, in the composite spinning method, there are problems with spindle unevenness in spinning and dimensional stability in sales and knitting, so it is often limited to special uses, and there are only a few examples of commercialization.

<Problems to be Solved by the Invention> The present invention provides a feminine fabric that has sufficient bulk, is free from spindle unevenness during spinning, and has excellent dimensional stability when woven or knitted. It is an object of the present invention to provide a bulky yarn for clothing, and also to provide a method for manufacturing the same, which does not cause troubles during spinning unlike conventional drawn and twisted mixed fiber yarns. Means for Solving the Problem> In other words, the present invention provides a fiber (■) having a seawater shrinkage ratio that is 21 or more lower than the seawater shrinkage ratio of the fiber (I), and two types of polymers. This is a mixed fiber yarn made of flat composite fibers (I) that are bonded together, and its manufacturing method involves simultaneously extruding polymers from separate nozzles in the same nozzle, spinning, and drawing. If the mixed fiber method is used, it is preferable that the two types of polymers constituting the fiber (III) are mixed.
It is characterized by a polymer constituting (I) and a polymer constituting fiber (II), and all of the above-mentioned problems can be solved by the mixed fiber yarn of the present invention and its manufacturing method.

The main points of the present invention are two types of mixed fiber yarns with different shrinkage, latent crimpability, which develops a twisted structure at the same time as crimping, and has special luster, bulkiness, and special touch texture. It consists of blending composite flat yarns that give 3 types of tlls and fibers.

The present invention also provides a method for rationally producing these three types of mixed fibers at once in a spinning process using the same spinneret. As shown in Fig. 1, different polymers are placed in the center and periphery of the cap, and slit-like holes are arranged along the radial direction in order to obtain a composite flat thread at the boundary between the three. A mildly mixed yarn is obtained.

Of course, it is also possible to use a method in which two types of fibers having different shrinkage rates and a flat composite spun fiber are separately spun, and then they are combined in the subsequent drawing process, false twisting process, or other process. Differences in shrinkage and physical properties can be obtained by spinning the fibers separately and combining them in a later step, but this increases the complexity of the process.

The following points are mainly mentioned as the effects obtained from the three-component yarn according to the present invention.

■ The force that causes twisting of composite flat yarns in woven fabrics is due to the difference in shrinkage between the two types of polymers that are stretched together and the size of the shrinkage of the yarn, but the restraining force within the woven fabric is large. Therefore, the twist of the composite flat yarn becomes large due to the addition of fibers with high contractility or contractile force other than the composite flat yarn, bulkiness due to different contraction yarns, bulkiness due to latent crimp, and bulkiness due to twisting. There will be a triple addition of gender. From this point of view, it is preferable that the shrinkage rate of the two types of single polymer yarns other than the composite flat yarn is high, and it is desirable that the boiling water absorption rate of the side with the greater shrinkage is at least 10 to 20%, and the ideal In its form, it is a single yarn made of highly contractible polymer.

If the single yarn fineness of a small single yarn is also large, then 150
Spinning speed of 0 m1 min or more and seawater shrinkage rate after stretching 10
% or more, the -layer shrinkage difference increases.

■In addition to the double-to-triple bulkiness due to the combination of single-polymer blend yarn and composite flat yarn with different shrinkage rates, the presence of flat yarns that can be twisted in the yarn also makes it easier to handle. The texture is particularly soft and has a special firm feel.

(2) As mentioned above, it is difficult to make the quality and dyeability of composite spun fibers uniform, and quality unevenness caused by the spindle opening method is particularly problematic. Furthermore, it also has the disadvantage of lacking dimensional stability when made into a woven or knitted fabric. The present invention has the effect of reducing or alleviating these drawbacks, and also reduces the bright spots that are characteristic of flat threads.

Furthermore, arrow points can be mentioned as an effect obtained by the method of the present invention.

(2) Since the method of the present invention is a so-called spinning/mixing method called y4, which is different from the conventional drawing/twisting/mixing method, there are fewer troubles in the first spinning process, and a sufficient bulkiness can be obtained.

The fibers (II) and fibers ([) constituting the mixed fiber yarn of the present invention are preferably polyester fibers, that is, 80 moles or more of the constituting polymer is an ethylene terephthalate unit.

There is a boiling water shrinkage rate Kj between the fiber (I) and the fiber (II).
? There must be a difference of 2% or more in terms of bulk.

There are various known methods for providing a difference of 2% or more, for example, fiber (I) and fiber (II).
Examples include a method in which the viscosity, degree of modification, etc. of the polymers used are different, or a method in which the stretching ratio, heat treatment conditions, etc. are different depending on the manufacturing process of the fiber (I) and the fiber (■). . As for the single fiber denier of fibers (I) and fibers (II), (I) is 1 to 3 denier and (■) is 0.
．． 5 to 1.5 denier and ([) single fiber denier <
The single fiber denier of (I) is preferable, and the ratio of the total denier of each of fibers (II) and fibers (II) to the entire mixed yarn is preferably about 3 to 4. ), fiber (II) is cross-shaped, T
It may have an irregular cross section such as a letter shape or a T shape.

In addition, as for the flat composite jR fibers (In) constituting the present invention, those having a flatness (that is, a ratio of the maximum diameter in the cross section of the fiber to the average diameter in the direction perpendicular to the fiber) of 4 to 7 are good in terms of bulk. From the viewpoint of bulkiness, it is preferable that the two types of polymers be laminated together using a line that crosses the maximum diameter of the fiber cross section as an interface. The combination of the two types of polymers constituting the fiber (l[I) is preferably one that produces latent crimpability when the two types of polymers are bonded together to form a composite spun fiber, and a preferred specific example is Examples of combinations include normal polyethylene terephthalate polymer and isophthalic acid copolymerized polyethylene terephthalate polymer, and normal polyethylene terephthalate polymer and sulfoisophthalic acid copolymerized polyethylene terephthalate polymer.

The weight ratio of the two types of polymers constituting the fiber (III) is preferably 30,270 to 70:30. The single yarn denier of fiber (III) is 1. A denier of b to 3 is preferable, and the proportion of the fiber (I) in the total denier is preferably about 20 to 40%.

As mentioned above, the method of the present invention uses the spinning and blending method, and the two types of polymers that make up the fiber (In) are the polymer that makes up the fiber (I) and the polymer that makes up the fiber (II). The combination is superior in terms of ease of manufacture.

In the method of the present invention, polymers extruded from the same die are mixed and taken off. The take-up speed at this time is preferably 1000 to 2000 m7 minutes.

Then, the mixed fiber yarn of the present invention is obtained through a further drawing step.

The blended yarn of the present invention is made into a fabric such as a woven fabric or a knitted fabric, and then heat-shrinked to obtain a bulky feminine/toned fabric.

The present invention will be explained below with reference to Examples.

Example 1 Using polyethylene terephthalate regular bright polymer obtained by a conventional method, 105
1000 m of denier, 24 filament undrawn yarn
Take-up was carried out at a speed of 7 minutes. Two of the same undrawn yarns were used to produce differentially shrinkable mixed fiber yarns using a heat treatment differential drawing method. That is, after drawing two drawn yarns with or without plate heat setting treatment at a first hot roller of 85°C, a heat treatment plate temperature of 200°C, a draw ratio of 3.55 times, and a drawing speed of 600 m/min, I took up gold thread. As a result, the boiling water shrinkage rates of both were 4.5% and 16.
It was 5%. Next, equal amounts of two types of polymers, polyethylene terephthalate/regular bright polymer and isophthalic acid 12 mole modified polyethylene terephthalate/regular bright polymer with a high intrinsic viscosity, were added.
Discharge through 2 slit holes, 96 denier, 12
Composite spinning winding of the filament flat yarn was carried out at a speed of 1000 m7 minutes. This undrawn yarn was passed through a first hot roller at 85°C, a drawing ratio of 3.25 times, and a drawing speed of 800 m.
Stretching was performed for 7 minutes. The obtained flat thread had a flatness of about 6.0 and a boiling water shrinkage rate of 19.5%. This flat thread had a conspicuous spindle pattern. The differentially contractile yarn and flat yarn obtained here were combined using an entangling nozzle at 1.8 klG and 1000 m.
The entanglement process was carried out for 7 minutes, and an entangled yarn with a number of entangled yarns of about 20 yarns/In was obtained. The resulting entangled yarn had almost no conspicuous spindle pattern.

The resulting intertwined yarn is made into gill fabric according to the process! ! As a result of weaving, a silk-spun fabric was obtained which was rich in bulk, had dimensional stability, and had a stiff and stiff texture.

Example 2 Two types of polymers, a polyethylene terephthalate plyte polymer obtained by a conventional method and a 12 mole isophthalic acid modified polyethylene terephthalate plyte polymer, were subjected to composite spinning using a spinneret shown in FIG. The number of nozzle holes for each of the three types is ■: ■: 0 = 24!
12:8, the ratio of the cross-sectional area of each nozzle is ■:■:o*z
:fi:5. The discharge amount of both polymers is equal, and 2
50 denier, 44 filament undrawn yarn 1000
It was wound up at a speed of m/min. This undrawn yarn was stretched at a first hot roller of 85° C., a stretching ratio of 3.35 times, a hot plate heat treatment temperature of 100° C., and a stretching speed of 800 m for 7 minutes. The difference in seawater shrinkage rate between the fibers obtained from the nozzle hole and the fibers obtained from the nozzle hole (2) was 3.5 inches. In addition, the flatness of the fiber obtained from the nozzle hole ■ is 5.0, 2
The proportions of seed polymers were equal. The single fiber denier of the fibers obtained from the nozzle holes of ■, ■, and 0 is 0.
It was 9.2.4.2.7. The resulting 3-crystal co-drawn yarn (75/48) had a ring water shrinkage rate of 15°1%, making it suitable for VIERA fabrics using favorable wefts! As a result, a silk-spun fabric with bulkiness, soft feel, excellent dimensional stability, and firmness was obtained.

[Brief explanation of the drawing]

FIG. 1 is a front view of a spinneret that can be used in the method of the present invention, and in the figure, 1.21. A, B, and C are from the following series, respectively. 1. Normal PET/polymer discharge area (outer area) 2.
(Inophthalic acid) modified PET/polymer discharge area (inner area) ■ Single polymer discharge hole for low yield (fine denier) (■
Discharge hole for composite flat spinning

Claims (1)

[Claims] 1. A flat composite formed by laminating a fiber (I), a fiber (II) having a boiling water shrinkage rate that is 2% or more lower than that of the fiber (I), and two types of polymers. Fiber (I
II) A blended yarn consisting of 2. The two types of polymers constituting the fiber (III) are
The mixed fiber yarn according to claim 1, which is a polymer constituting the fiber (I) and a polymer constituting the fiber (II). 3. A fiber (I), a fiber (II) having a boiling water shrinkage rate that is 2% or more lower than that of the fiber (I), and a flat composite fiber (I) made by laminating two types of polymers together.
A method for producing a mixed fiber yarn consisting of II) by a spinning and blending method in which polymers are simultaneously extruded from separate nozzles in the same spinneret, spun, and drawn. 4. The two types of polymers constituting the fiber (III) are
The manufacturing method according to claim 3, wherein the polymer constituting the fiber (I) and the polymer constituting the fiber (II) are used.