JPH0726432A - Spun yarn composed of cation-dyeable polyester fiber - Google Patents

Abstract

PURPOSE:To produce a sliver having stable quality in remarkably improved productivity while eliminating the troubles of massive breakage, centralized breakage, no-draft defect, etc., in the production of a sliver by the stretch breaking of a cation-dyeable tow composed of fine-denier fibers and to obtain a fiber having soft feeling and spun yarn composed of the fiber. CONSTITUTION:This spun yarn is composed of cation-dyeable polyester fibers containing 1.5-8mol% of an alkali metal sulfoisophthalate and 1.0-10.0wt.% of titanium dioxide or silicon dioxide particles having primary particle diameter (median diameter) of <=0.4mum and having a single fiber denier of <=2de, an average fiber length of >=80mm and a single fiber elongation of 12-40%.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spun yarn using a sliver obtained by directly converting a tow made of a cationic dyeable polyester fiber into a sliver by the drafting method.

[0002]

2. Description of the Related Art In recent years, a method of forming spun yarn by using one or more false twist nozzles using 100% polyester fiber has been researched and developed. The spun yarn produced by this method is called so-called bound spun yarn, and is about to be used for clothing as well. However, it has a hard texture compared to spun yarn with real twist and is suitable for consumer needs. It is difficult to develop for clothing as it is. In addition, the tow check-and-break sliver system, which uses sliver all at once for the purpose of labor saving, simplification, omission, etc. of the spinning process, has been reviewed, and research and development of this system using polyester fiber most commonly used for clothing Is being done. However, polyester fibers generally have high strength and elongation, poor fiber separation property and cut-off property, and low productivity. In particular, round cross-section fibers with a single fiber denier of 1 denier or less, or a triangle in which surface contact occurs between fibers,
This tendency is remarkable in polyester fibers having irregular cross sections such as polygonal shapes and flat shapes. In particular, the cationic dyeable polyester fiber has a problem that the fiber surface friction is large due to its polymer property and thus the cut-off property and the fiber splitting property are poor.

As a method of improving such problems,
Several methods have been proposed so far. For example, Japanese Examined Patent Publication No. 46-4090 discloses a method for preventing concentrated cutting during check-breaking by making the fiber group constituting the continuous fiber bundle morphologically and in terms of density and without unevenness in thickness. However, it is not possible to eliminate concentrated cutting at all, let alone improve cut-off characteristics such as collective cutting and node raft. In Japanese Patent Publication Nos. 47-27806, 55-1378, and 53-49127, the breaking elongation of a single fiber is changed so that it partially deviates from its average value. It has been shown that concentrated cutting and collective cutting are prevented by giving a strong variation in the longitudinal direction of the fiber or by varying the fineness and strength within a specified range. Since the elongation, strength, and fineness of the monofilament physical properties are different depending on the drafting by these methods,
The cutting points will be widely dispersed throughout the draft cutting area, and the frequency of concentrated cutting or collective cutting will be considerably reduced. In this respect, the fibers obtained by these methods are superior to commercially available polyester fiber tows. However, the sliver obtained by drafting these fiber bundles tow has an abnormally large fiber length distribution due to the difference in the drafting required time due to the difference in individual single fiber characteristics, and the original elongation,
Since there are large variations in strength and fineness, the single fibers that make up the sliver also have large variations in these characteristics.
Therefore, the uniformity of spun yarn obtained by using this sliver is poor, and not only high quality spun yarn cannot be obtained, but also various problems such as generation of cotton wool and yarn breakage remain during spinning. Come out.

On the other hand, JP-A-53-31816 discloses a method of chopping off the tow of a polyester fiber containing 0.1 to 1% by weight of china clay or calcium carbonate fine particles inside the fiber. 58-98420
In the gazette, the total average value of the cutting elongation of the single fiber is 25% or less, and the standard deviation value is 4.5% in the variation characteristic of the cutting elongation.
Below, a tow containing 0.3 to 3 denier single fiber denier (1.2 to 1.5 dr, 2.9 dr in the example) and containing 0 to 1% by weight of inactive fine particles such as titanium dioxide and calcium carbide is drawn. In the method of cutting, and in Japanese Patent Publication No. 56-34650, the elongation at break × (0.60 to 0.60) of the tow corresponding to the above at a temperature of 160 ° C. or higher and a fusion generation temperature or lower.
A method for producing a sliver in which hot drawing is carried out at a draft rate of 0.95), followed by drafting, and further, in JP-A-1-33216, a tow of polyester fibers containing 1 to 10% by weight of silicon dioxide is drafted. Although a method of doing so has been proposed, these conventional techniques still cause concentrated cutting and collective cutting, and have not yet improved the cut-off property. Also,
At present, these polyester fibers are not modified with sulfoisophthalic acid, and thus have problems such as poor color development during dyeing.

[0005]

The object of the present invention is to perform cation dyeing, and to produce a sliver by chopping a tow composed of fibers having a fineness of 2 denier or less, particularly 1 denier or less, It is an object of the present invention to provide a fiber having a soft texture and a spun yarn thereof by eliminating slicing, concentrated cutting, node raft, etc., and greatly improving productivity and manufacturing a sliver having stable quality.

[0006]

That is, the present invention relates to a polyester fiber containing an alkali metal salt of sulfoisophthalic acid in an amount of 1.5 to 8 mol% and having a primary particle diameter (center particle diameter) of 0. It contains 1 to 10% by weight of particles of titanium dioxide or silicon dioxide of 4 microns or less, and the denier of single fiber is 2 denier or less, preferably 1 denier or less, the average fiber length is 80 mm or more, and the single fiber elongation is 12-
A spun yarn composed of 40% polyester fiber. still,
The central particle diameter in the present invention means the median diameter by the centrifugal sedimentation method.

The polyester fiber used in the present invention contains 1.5 to 8 mol% of an alkali metal salt of sulfoisophthalic acid (hereinafter abbreviated as "SIP") and has a primary particle diameter (center particle diameter) of 0. 1 to 10% by weight of particles of titanium dioxide or silicon dioxide having a size of 4 microns or less, single fiber denier of 2 denier or less, and single fiber elongation of 12 to 40.
% Polyester fiber.

In the present invention, particularly when a sliver is manufactured by using a tow composed of fibers having a fineness of 1 denier or less, an excellent stretch-cutting property can be realized, and the obtained sliver is used as a spun yarn. The feature is that not only a spun yarn having excellent flexibility and texture can be obtained, but also excellent color forming property can be realized by cation dyeing.

The polyester is terephthalic acid or an ester-forming derivative thereof and ethylene glycol, and a modified polyester using SIP as a copolymer acid component. The content of SIP is preferably 1.5 to 8 mol%, and more preferably 2.5 to 6 mol%. SI
When the content of P is less than 1.5 mol%, the color developability becomes poor, and when it exceeds 8 mol%, the melt viscosity becomes large, and it is difficult to form a fine denier of 2 denier or less.

Polyester fibers containing particles of titanium dioxide or silicon dioxide are prepared by adding a mixture (slurry) of titanium dioxide having an average particle size of 0.3 micron, ethylene glycol, terephthalic acid, etc. to an esterification tank, Then, after polycondensation, it can be obtained by spinning, stretching and crimping by a conventional method. It can also be obtained by adding titanium dioxide or silicon dioxide to the polymer after completion of the polyethylene terephthalate polymerization, spinning by a conventional method, and stretching and crimping.

In this case, if the particles of titanium dioxide or silicon dioxide to be added exceed 0.4 μm, the yarn is likely to agglomerate due to heat shock or the like, and if agglomerates occur, it cannot be redispersed. Therefore, in order to uniformly disperse the particles and improve the process stability during spinning and drawing, the primary particle diameter (center particle diameter) of titanium dioxide or silicon dioxide is 0.4 micron or less, preferably 0.3.
It is desirable that the thickness be less than micron.

The amount of titanium dioxide or silicon dioxide particles added is preferably in the range of 1.0 to 10% by weight, preferably 1.5 to 9% by weight, more preferably 2 to 6% by weight. If the amount is 1.0% by weight or less, stable drafting cannot be performed in parlock drafting, resulting in reduced productivity. If the amount exceeds 10% by weight, spinning becomes extremely difficult and the fiber becomes brittle, which is a problem.

It is most desirable that the amount of SIP added is in the range of 1.0 to 10 mol%, preferably 1.5 to 5 mol%, because good color development is achieved.

The titanium dioxide- or silicon dioxide-containing polyester desirably has an intrinsic viscosity of 0.35 dl / g or more. When the intrinsic viscosity is less than 0.35 dl / g, the spinnability in spinning tends to deteriorate, which is not preferable. Here, the intrinsic viscosity is obtained by measurement in a mixed solution of phenol / tetrachloroethane in an amount of 30 ° C.

The monofilament elongation of the polyester fiber used in the present invention is required to be 12 to 40%, and the fiber having such elongation is generally used in the melt spinning-
It can be obtained by appropriately selecting conditions such as pore area of the spinneret, single hole discharge amount, winding speed, draw ratio or tension heat treatment in the winding-heat treatment step.
If the elongation exceeds 40%, the draft resistance tends to deteriorate,
Within this range, particularly high strength and fine denier tow can be drafted.

The titanium fiber or silicon dioxide particle-containing polyester fiber crimped tow thus obtained is subjected to parlock drafting. The tow thickness varies depending on the thickness of the sliver to be produced, but the total denier is 10,000. ~ 1
Suitably in the range of, 000,000 denier. Checkout
It may be single-stage or multi-stage, and the drafting condition may be the same as the generally adopted drafting condition, whereby a stable drafting property and a good quality sliver are spun.

FIG. 1 shows an embodiment of the present invention. In the figure, the titanium dioxide or silicon dioxide particle-containing polyester fiber tow (2) drawn out from the carton box (1) is guided to the tension guide (4) by guides (3a) and (3b), where the fiber tow Give tension to remove sagging and tension, and make a toe. In the tow that has entered the check-and-break area, the monofilament partially sags, pulls,
It is desirable to remove the sagging or tension, because if the sagging or tension such as a loop occurs, it will cause concentrated cutting or collective cutting in the drafting area. As mentioned above, the tow thickness may reach 1 million denier in total denier,
In order to make such a thick denier tow, it is necessary to bundle and use a plurality of tows previously stored in the carton box. It is preferable to divide and sufficiently prepare the tow.

The conditioned tow subsequently enters a first drafting zone consisting of a nip roller (5) and a drafting roller (6a). In this first drafting area, the length of the raw yarn is usually 4.5 times or more, preferably 7 times or more, and is drafted and cut. After undergoing the first stage drafting, in the figure, the subsequent drafting rollers (6b), (6c) subsequently receive the second stage and third stage drafting, and the barlock sliver having the desired fiber length is obtained. , Store in the storage can (7).

According to the production method of the present invention, there is no concentrated cutting, collective cutting, node raft, etc., and a good drafting property is exhibited, not only the productivity is improved, but also the fineness, strength and elongation are uniform. You can get a nice sliver. Therefore, a spun yarn that is extremely homogeneous and flexible can be obtained from the obtained sliver. Regarding the method for producing spun yarn, it may be directly introduced into a spinning machine using the above-mentioned sliver, a drawing machine,
The spun yarn may be passed through a roving machine and a spinning machine.

[0020]

EXAMPLES The present invention will be described in detail below with reference to examples, but the present invention is not limited thereto. In the physical properties of the spun yarn obtained, U%, IP
I is made by Keisokuki Kogyo Co., Ltd. (Model KET-80B)
U% Ibnes tester. The smaller this value is, the better the uniformity is. The number of fluffs was measured with an F-index tester manufactured by Toray DT-104.

Example 1 Intrinsic viscosity of 0.50 dl /
g, titanium dioxide with a central particle size of 0.4 microns is 2.5
Copolymerized polyethylene terephthalate containing 3.5% by weight of SIP and 3.5 mol% of SIP was spun at a take-up speed of 1050 m / min and drawn 3.15 times by a winding method, and the single fiber fineness was 1.4 dr and the strength was 5. A fiber having 9 g / d, an elongation of 19%, a crimp number of 12.5 pcs / inch, and a crimp rate of 7.0% was obtained, and a tow having a denier of 690,000 dr was obtained. The tow is tensioned and aligned in a process as shown in FIG. 1, aligned and towed, and subsequently led to a first drafting zone composed of a nip roller and a drafting roller, where a draft rate is 7.72 times. The draft rate is 1.52 times in the second draft area, the draft rate is 1.94 times in the third draft area, and the total draft rate is 22.
The paper was cut off by 7 times to obtain a parlock sliver. The stretchability was very good. Regarding the sliver characteristics obtained, the sliver U% was 2.8% and the average fiber length was 105 mm. By using the sliver of the present invention, it is possible to obtain a spun yarn having a unique silk-like texture which is not found in the spun yarn obtained from the conventional staple having a cross section of 1.3 d × 38 m / m.

Example 2; Intrinsic viscosity 0.42 dl /
g, and 3% by weight of silicon dioxide having a central particle size of 0.03 micron and 5 mol% of SIP were added to obtain a copolymerized polyethylene terephthalate using a hollow spinneret at a take-up speed of 105.
The fiber was spun at 0 m / min, wound up, and drawn 3.1 times by a conventional method to obtain a single fiber fineness of 1.8 dr, a strength of 3.0 g / d, and an elongation of 2.
A fiber having 3%, a crimp number of 11.8 pcs / inch, and a crimp ratio of 6.3% was obtained, and a tow having a tow denier of 480,000 denier was obtained. The tow thus obtained is tensioned and aligned in a process as shown in FIG. 1, aligned and towed, and subsequently introduced into a first drafting zone composed of a nip roller and a drafting roller. The draft rate is 7.20 times, and the draft is cut off.
The draft ratio was 1.45 times in the draft area, the draft ratio was 1.67 times in the third draft area, and the total draft rate was 17.4 times to obtain a parlock sliver. The stretchability was very good. The obtained sliver characteristics have a sliver U% of 3.
The average fiber length was 1% and the average fiber length was 98 mm.

Example 3; Intrinsic viscosity 0.48 dl /
g, 3% by weight of silicon dioxide having a central particle diameter of 0.03 micron, and 2.5 mol% of SIP were added to the copolymerized polyethylene terephthalate using a true round die (circular cross section).
The fiber was spun at a take-up speed of 1200 m / min, wound, and stretched 3 times by a conventional method to obtain a single fiber of 0.7 dr and a strength of 5.9 g / d.
Elongation 19%, number of crimps 12.8 / inch, crimp rate 6.5
% To give a 580,000 denier tow denier tow. The tow thus obtained is tensioned and aligned in a process as shown in FIG. 1, aligned and towed, and subsequently introduced into a first drafting zone composed of a nip roller and a drafting roller. Was drafted at a draft rate of 6.6 times, further drafted at a draft rate of 1.80 times in the second draft zone, and drafted at a draft rate of 1.70 times in the third draft zone to obtain a parlock sliver. The stretchability was very good. The sliver characteristics obtained are: sliver U% 3%, average fiber length 85 m
It was m. This sliver is spun directly on a spinning machine and 2
It was a spun yarn of 0'S. Table 1 shows the physical properties of the spun yarn.

Example 4; Intrinsic viscosity 0.42 dl /
g, 5% by weight of titanium dioxide having a central particle size of 0.27 micron, and 4.5 mol% of SIP were added to the copolymerized polyethylene terephthalate using a true round die (circular cross section).
The fiber was spun at a take-up speed of 1200 m / min, wound up, and drawn 3.3 times by a conventional method to obtain a single fiber fineness of 1.4 dr and a strength of 5.4.
A fiber having a g / d, an elongation of 23%, a crimp number of 12.1 pcs / inch and a crimp rate of 12.2% was obtained, and a tow having a denier of 630,000 dr was obtained. The tow thus obtained was tensioned and aligned in a process as shown in FIG. 1, aligned and towed, and subsequently, led to an area consisting of a nip roller and a drafting roller to give a total draft ratio of 4 to 10 It was doubled to obtain a parlock sliver. The stretchability was very good. The resulting sliver had a sliver U% of 2% and an average fiber length of 82 mm. This sliver was directly spun by a spinning machine to give a 20'S spun yarn. Table 1 shows the physical properties of the spun yarn.

Example 5: Intrinsic viscosity 0.47 dl /
g, copolyethylene terephthalate containing 3% by weight of titanium dioxide having a central particle size of 0.27 micron and 1.7 mol% of SIP was spun at a take-up speed of 1300 m / min using a true round die (round cross section). Then, it is wound up and stretched 3.1 times by a conventional method to obtain a single fiber fineness of 0.5 dr and a strength of 5.5.
g / d, elongation 25.3%, crimp number 12.1 pieces / inch,
A fiber having a crimping rate of 8.1% was obtained, and tow denier was 510,000 dr.
Tow The tow thus obtained is tensioned and aligned in a process as shown in FIG. 1, aligned and towed, and subsequently led to an area composed of a nip roller and a draft roller, and a total draft ratio is 4 to 8 times. Then, it was cut off to obtain a parlock sliver. The stretchability was very good. The obtained sliver had a U% of 2% and an average fiber length of 98 mm.

[0026]

[Table 1]

Comparative Example 1 Polyethylene terephthalate having an intrinsic viscosity of 0.60 dl / g (30 ° C. in ethanol-tetrachloroethane) and containing 0.5% by weight of titanium dioxide was subjected to the same spinning and drawing conditions as in Example 3. A polyester fiber crimped tow having a denier of 58 denier was produced. The tow was stretched under the same conditions as in Example 3, but was difficult to cut, and the color development was insufficient. The barrier property was poor.

[0028]

According to the present invention, a tow consisting of fibers containing 3% of titanium dioxide or silicon dioxide and having a fineness of 1 denier or less is formed into a sliver by the chopping method, whereby concentrated cutting, collective cutting, A sliver that does not have node rafts and is stable in quality with high productivity is obtained. The spun yarn obtained by using the sliver has a soft feel with a cool feeling and is excellent in coloring after dyeing. Is.

[Brief description of drawings]

FIG. 1 is an example of a process diagram for drafting a tow used in a manufacturing method of the present invention.

[Explanation of symbols]

 1 Carton Box 2 Polyester Fiber Tow 3a, 3b Guide 4 Tension Guide 5 Nip Roller 6a, 6b, 6c Checking Roller 7 Storage Case

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location D01G 1/00 A 7152-3B

Claims (1)

[Claims] 1. A cationic dyeable polyester fiber containing an alkali metal salt of sulfoisophthalic acid in an amount of 1.5 to 8 mol%, and titanium dioxide or dioxide having a primary particle size (center particle size) of 0.4 micron or less. Silicon particles from 1.0 to
Contains 10.0% by weight, single fiber denier of 2 denier or less, average fiber length of 80 mm or more, single fiber elongation of 12 to
Spun yarn consisting of 40% polyester fiber.