JPS58220818A - Polyester mixed multifilament yarn - Google Patents

Abstract

PURPOSE:The titled yarn that is a filament mixture consisting of filaments in which the part slightly soluble in alkali is divided into plural cross sections by the part easily soluble in alkali and the other filaments in which the part easily soluble in alkali is divided by the part slightly soluble in alkali, thus giving soft, comfortably elastic and rustling feel. CONSTITUTION:Conjugated filaments X which have a cross section where the polyester B slightly soluble in alkali is divided into plural sections by the other polyester A easily soluble in alkali and the other conjugated filaments Y which have a cross section where the polyester easily soluble in alkali D is divided by the other polyester slightly soluble in alkali C are mixed so that the segment fineness of the polyester B slightly soluble in the conjugated filament X is made smaller than that of polyester C in the conjugate filament Y.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a polyester-mixed multifilament yarn that is soft, has stiffness and tension, and is suitable for high-grade weaving and knitting with a sharp and loose feel.

Woven and knitted fabrics obtained from fine-grained multifilament yarns exhibit a soft touch and texture, but lack elasticity and tension.As the filament fineness increases, the opposite characteristics become stronger. Mixed yarns consisting of fine and thick filaments are widely used as multifilament yarns for woven and knitted fabrics.

Techniques for manufacturing such mixed fiber yarns include spinning filaments with different finenesses in advance and mixing them into drawn yarn, or spinning and drawing them and then mixing them. A method of simultaneously spinning filaments having different fineness to form a mixed yarn is advantageous in terms of cost and is practiced on an industrial scale.

However, the degree of fineness of mixed fiber yarn that can be stably produced using the simultaneous spinning method is about 5 times or less in terms of fineness ratio, and as the fineness ratio increases beyond this, yarn breakage during spinning and drawing increases. The resulting drawn yarn has the disadvantage that many walnuts are generated, and the filament and filament constituting the mixed fiber yarn are also disadvantageous.
If an attempt is made to mix ultrafine yarns of 1 denier or less in the fibers, there is a drawback that yarn breakage tends to occur frequently during spinning and drawing.

The following are attempts to obtain a mixed fiber yarn of filaments with different finenesses using composite spinning technology.

JP-A-52-114772 discloses a cut pile in which the fineness of the segments forming the island components in sea-island type composite yarn is varied.

A technique has been disclosed in which a mixed fiber woven or knitted fabric with different fineness is obtained after removing the sea component, but one composite filament or lament has a large fineness and is not suitable for ordinary woven or knitted fabrics.

Another drawback is that the composite spinneret is complicated.

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Japanese Patent Publication No. 5-37044 discloses a technique for changing the fineness between segments in a split-type composite yarn, but since each component is distributed asymmetrically within the composite yarn cross section, the shape of one segment, In particular, there is no arbitrariness in the cross-sectional shape of segments with large fineness;
The disadvantage is that bending under the spinneret tends to occur during spinning, and the disadvantage that coarse shrinkage and walnuts tend to occur in drawn yarn.Furthermore, the divided components between each segment are almost uniform in thickness, so the divided components can be removed. There is a drawback that segments that should be separated and independent are likely to come into contact with each other later on.

Japanese Patent Application Laid-Open No. 50-5650 discloses a technology for a mixed yarn of high-shrinkage filaments and low-shrinkage split filaments, but there is no technology for manufacturing a mixed yarn that emphasizes the difference in fineness. nothing is said.

In addition, in the conventional mixed yarn technology with a difference in fineness,
It has been difficult to impart the squeaky feel, silky ringing, dry touch, and elegant silky luster required for gauzy knitted fabrics, especially high-quality full-kied woven fabrics.

In this way, in the conventional technology using composite spinning, there is no technology suitable for producing mixed fiber yarns with significantly different fineness differences, and the present inventors have developed a yarn that is soft, has elasticity, is firm, and has a moderate squeaky feeling. The present invention was achieved through research into a blended yarn that can exhibit the characteristics required for high-grade woven and knitted fabrics, such as elegant luster, high color development, and resistance to wrinkles.

That is, the present invention has a composite filament X having a cross-sectional shape in which the alkali-easily soluble polyester B is divided into a plurality of alkali-easily soluble polyesters B, and the alkali-easily soluble polyester D is divided into a plurality of pieces by the alkali-easily soluble polyester C. A mixed fiber yarn with a composite filament Y having a divided cross-sectional shape, the fineness of the segment of the slightly alkali-soluble polyester B constituting the composite filament It is a polyester blend multifilament yarn characterized by a fineness smaller than that of C.

The cross-sectional shape of the composite filament in the present invention will be explained below.

First, a composite filament x having a cross-sectional shape in which the alkali-easily soluble polyester A and the alkali-poorly soluble polyester B are divided into a plurality of pieces will be described. 1st
Figure 2 shows the most preferable cross section of the composite membrane X according to the present invention. Polyester B is divided into three parts, each of which has a slightly alkali-solubility polyester B, each containing five convex outer peripheries and occupying most of the convex parts, and the boundary between both polyesters is curved.

The cross section shown in Figure 2 is four-lobed, and the alkali-easily soluble polyester A is divided into four parts, and the alkali-refractory polyester B is divided into four parts. The boundary between both polyesters is curved. When the easily alkali-soluble polyester A is dissolved and removed from these composite filaments x in an alkaline solution, the individual constituent segments of the slightly alkali-soluble polyester B are divided with almost no change in the outer peripheral shape.

If the boundary between both polyesters is straight, after removing the easily alkali-soluble polyester A, the individual constituent segments of the slightly alkali-soluble polyester come into surface contact with each other and are not apparently divided, but as if they were a single thread. Since this behavior is likely to occur, it is preferable that there be substantially no linear portion at the boundary between both polyesters.

Next, a composite filament Y having a cross-sectional shape in which alkali easily soluble polyester D is divided into a plurality of pieces by a slightly alkali soluble polyester C will be described. FIGS. 3 and 4 show typical preferred cross sections of the composite filament Y of the present invention. The composite filament Y shown in FIG. occupies six locations on the filament surface and is arranged in a wedge shape toward the inside of the filament.

The composite filament Y shown in FIG. 4 is a five-lobed cross-section yarn, and the alkali easily soluble polyester D occupies five locations on the filament surface and is arranged in a wedge shape toward the inside of the filament. When the alkali easily soluble polyester D is dissolved and removed in an alkaline solution, the fiber becomes almost in the shape of the hardly soluble polyester C in the composite 2-lame/t Y, and fibers with grooves on the surface are obtained.

FIG. 5 is an enlarged view of the vicinity of the filament surface when focusing on one alkali easily soluble polyester D in the cross section of the composite filament Y. P and Q are the boundary points between the easily alkali-soluble polyester D and the poorly alkali-soluble polyester stell C on the filament surface, and the line segment PQ
Let be the surface length of one alkali easily soluble polyester D. From the viewpoint of imparting sharpness and color development, the length of the line segment PQ is preferably 02 to 4μ, more preferably 0.3 to 5μ.

1'P, (Also, the sum of the lengths on the filament surface of the easily alkali-soluble polyester D is the slightly alkali-soluble polyester C.
It is preferable that the ratio is 2 to 40% of the sum of the filament outer circumferential lengths because at least a part of the alkali easily soluble polyester D is dissolved and removed to produce a fiber with grooves on the surface, which can exhibit an elegant luster. It is more preferable that it is in the range of 5 to 55. Furthermore, alkali easily soluble polyester D
The depth of the grooves is preferably 0.2 μm or more and less than 2 μm from the viewpoint of imparting good texture and color development when at least a portion of the fiber is dissolved and removed to obtain a fiber with grooves on the surface. The depth of the alkali easily soluble polyester D in the composite filament Y defined above is preferably at least 0.3 μm or more, more preferably 1 μm or more.

Midpoint S of line segment PQ and alkali easily soluble polyester D
The line segment Re connecting the point R closest to the filament center of gravity is
is the depth of the alkali easily soluble polyester D. If the points that intersect with the boundary line of both polyesters in a straight line perpendicular to the midpoint M of the line segment R'S are T and U, then the line molecule is l/
The length of U is 4.0 to 90% of the length of line segment PQ, and it is preferable to form a wedge-shaped shape tapering toward the center of gravity of the filament from the viewpoint of improving color development.

The number of alkali 1 and easily soluble polyester D on the outer periphery of the composite filament Y is 1.In a hard place, when the fabric is mixed, the probability force that exists on the surface; The effect of improving properties is extremely small, so it is necessary to have two or more locations.On the other hand, if there are too many 15 because the gloss decreases.
The number is preferably less than 3, and more preferably 3 to 12.

By making the cross-sectional shape of the composite filament Y into an irregular cross-section, it is possible to favorably impart the irregular cross-section effect, especially the 7 Luky gloss. The irregular cross-sectional shape may be any known cross-section, and is preferably a T-shape or a 3- to 6-lobed cross-section in terms of the strength and silky luster that can be applied. In addition, as shown in the cross section shown in FIGS. 5 and 4, the surface shape portion of the alkali easily soluble polyester D occupies the vicinity of the apex of the irregular cross section, and the composite yarn is made of alkali. When at least a part of the easily soluble polyester D is dissolved and removed to form a fiber with grooves on the surface, the squeaky feeling and color development can be further improved. It is preferable that at least a portion of the composite filament Y is a composite filament Y that occupies the vicinity of the apex of the irregular cross section.

The apex of the irregular cross section is the farthest point F from the filament center of gravity in the convex outer circumferential portion when viewed from the direction of the filament center of gravity, and occupying the vicinity of the apex means including the apex.

The cross-sectional shapes of the composite filaments X and Y are preferably symmetrical with respect to the rotation axis passing through the center of gravity of the filaments from the viewpoint of stably spinning the composite filaments.

The mixed filament filament yarn of the present invention is composed of the above-mentioned composite filament or composite filament Y, and the fineness of the segments of the slightly alkali-soluble polyester B constituting the composite filament X is the same as that of the composite filament Y. One of the characteristics is that the fineness is smaller than that of the slightly alkali-soluble polyester C that constitutes the polyester C.

That is, the composite file 1. The fineness of the segment of the slightly alkali-soluble polyester B constituting the filament X is the slightly alkali-soluble polyester C constituting the composite filament Y
This means that when the alkali easily soluble polyester is dissolved and removed from each composite filament, the fineness of the split filament formed by the slightly alkali soluble polyester B and the surface formed by the slightly alkali soluble polyester C is A thick filament with grooves] is obtained, and a polyester mixed multifilament yarn, which is the final objective of the present invention, is obtained. In order to exhibit the effect of the difference in fineness, the ratio of the fineness of the segment of the poorly alkali-soluble polyester B to the fineness of the alkali-releasingly soluble polyester C constituting the composite filament Y must be 0.8 to 0.
The range of 0.05 is preferable, and the range of 0.7 to 0.1 is more preferable. If the ratio is larger than 0.8, the effect of the difference in fineness will be minute, and if it is smaller than O,OS, the thick filaments will be emphasized, resulting in a coarse and hard texture with a core.

It is also possible to make the fineness of composite filament X finer than that of composite filament Y and to make the ratio extremely small.
When the ratio M to the fineness is 0.85 or less, the effect of the present invention is more exhibited.In order to obtain a mixed multifilament yarn without fluff or sagging, the ratio M is 0.85 to 0.85.
More preferably, it is in the range of 0.3.

For example, if the ratio M is 0.5 and the number of divisions of the composite filament X is 4, the ratio will be about 1/8.

If there is an extremely large difference in the fineness of the individual filaments of the multifilament yarns that make up the woven or knitted fabric, it is easy to cause irritation due to differences in dyeing, differences in gloss, etc. It is possible and preferable that the mixed fiber multifilament yarn containing the fibers has three or more types of fineness after division.

In this case, the effects of the present invention can be easily exhibited by making the composite filament X with a large number of divisions have a fine fineness. Especially complex soy 1. The effect is remarkable when Y has an irregular cross section.

In order to obtain a soft, stiff and taut woven or knitted fabric, the fineness of the alkali-poorly soluble polyester C constituting the composite filament Y is 2 to 8 deniers, and the fineness of the segment of the alkali-poorly soluble polyester B is 0.2 to 3. Denier is preferred.

In addition, the ratio of the number of 1 composite filament Y to the total number of filaments of mixed multifilament yarn is 0.2~
The ratio of the number of composite filaments X to the total number of filaments of the mixed multifilament yarn is preferably in the range of 0.4 to 0.8.

Next, the polyester polymers constituting the composite filaments X and Y of the present invention will be explained.

The types of polyesters preferably used as polymers for forming the slightly alkali-soluble polyester B constituting the composite filament X and the slightly alkali-soluble polyester C constituting the composite filament Y are terephthalic acid and isophthalic acid.

Phthalic acid, naphthalene-2,6-dicarboxylic acid.

Any aromatic dicarboxylic acid or adipic acid.

aliphatic dicarboxylic acids such as sepacic acid or esters such as ethylene glycol, diethylene glycol, 1,4-butanediol, neopentyl glycol,
It is a polyester synthesized from a diol compound such as cyclohexa-7-1,4-dimethanol, and particularly preferably a polyester in which 80% or more of the structural units are ethylene terephthalate units.

Further, polyalkylene glycol, pentaerythritol, methoxyalkylene glycol bisphenol νA, sulfoisophthalic acid, etc. may be added to or copolymerized with the above polyester component.

However, if a metal sulfonate is included, it should be 6 mol% or less based on the acid component contained in the polyester, and the amount of the sulfonate in the corresponding composite filament/) It is also preferable to reduce the amount by 2 moles or more.

Note that the slightly alkali-soluble polyesters A and C may be the same polymer or different.

Next, the alkali easily soluble polyester A constituting the composite filament X and the alkali easily soluble polyester D constituting the composite filament Y will be explained. When producing a final woven or knitted fabric using mixed multifilament yarn, fuzz, sagging, and yarn breakage may occur due to peeling between the polymers forming the composite filaments X and Y until the weaving is completed. Furthermore, it is necessary to be able to quickly remove the alkaline easily soluble polyesters A and D from the knitted and woven mixed fiber multifilament yarn.

The alkali easily soluble polyesters A and D in the composite filaments X and Y have sufficient peeling resistance, and can be treated with an alkaline aqueous solution, which can be preferably used as a dissolution and removal treatment from the viewpoint of ease of operation, safety, and cost. Each composite filament must exhibit a faster dissolution rate in alkaline aqueous solution treatment than the corresponding alkali-poorly soluble polyester B or C. The ratio of alkali dissolution rates among the polyesters constituting the composite filament X is preferably at least 4 times or more.

It is more preferably 6 times or more, and among the polyesters constituting the composite filament Y, it is preferably at least 1.5 times or more, and more preferably 2.5 times or more.

The alkali easily soluble polyesters A and D may be the same or different polymers, but the composite filament It is preferable that the alkali-easily soluble polyester A has a higher alkali solubility because the color development can be improved by the effect of the residual polyester D without being dissolved in the polyester.

Examples of polyesters that are easily soluble in alkali include copolymers of polyester and polyalkylene glycol, polyesters containing polyesters containing anionic surfactants, and polyesters containing metal sulfonate groups. A polyester containing a metal sulfonate group can be preferably used from the viewpoints of availability and thread-spinning properties.

The polyester copolymerized with metal sulfonate-containing ester units will be described in detail below.

The polyester copolymerized with metal sulfonate-containing ester units that can be preferably used as the easily alkali-soluble polyester of the present invention is 805M containing the structural unit -x-z-y-, where -2- is Divalent arylene group metal SO,
M is a sulfonate salt or a metal sulfonate salt of a divalent alkylene group such that -X- is separated from the -8O,M group by at least three atoms, and -X- is 10-C- 1 1 10-(CH2)nlIO(CH2)n]rn-0- and -c-[:O(CH2)n3m-0-; - is the same as -X- or hydrogen. The metal sulfonate is preferably one introduced by replacing hydrogen in one of the acid components forming the polyester.

Note that n and m are integers, n is greater than or equal to 1, and M
is metal. Preferred classes of main components of these polyesters are terephthalic acid or its ester-forming derivatives and polymethylene glycols having the formula Ho(aH) OHp (where p is 2 to 1).
(an integer of 0) and 1'r, N
! J! ft/ 7 ke v 7 'p v l"""
The polyester containing the phonate metal salt derivative can also contain up to about 10 mol % of glycols or other esters or oxycarboxylic acids. For example, inophthalic acid as an acid component.

Aromatic dicarboxylic acids such as phthalic acid, naphthalic acid, dicarboxylic acid, and aliphatic dicarboxylic acids such as adipine acid and sebacic acid; Tyl glycol, /clohexano-1,4-dimetatool, etc. can be mentioned.

In addition, the alkali easily soluble polyester A is a polyester having a metal sulfonate, and preferably 284 or more mole percent, more preferably 6 mole percent or more of the total structural units are ethylene 5-nodium sulfoisophthalate,
In addition, a polyester in which 70 mol% or more is ethylene terephthalate can be suitably used.

11. 11. The alkali easily soluble polyester D is preferably 1 mol% or more, more preferably 2.4 mol% or more of the total structural units as a polyester having a metal sulfonate.75:
A polyester in which x-f is 15-ndium sulfoisophthalate and 70 or more moles of ethylene terephthalate can be suitably used.

Well-known additives such as matting agents, antioxidants, fluorescent whitening agents, flame retardants, ultraviolet absorbers, etc. may be added to the gillyester polymers constituting the composite filaments X and Y to the extent that they do not impede the effects of the present invention. It is also possible to contain it.

The ratio of both polyesters in the composite filament Polyester C; Polyester B has a weight ratio of 35
=65~2:98 range is preferable, 30 near 0~5:
A range of 95 is more preferred. The ratio of both polyesters in the composite filament Y is polyester C; polyester D is 70 in terms of weight ratio in order to give a suitable squeaky feeling and color development.
:30-98:2 range is preferable, 75:25-95
: The range of 5 is more preferable.

Composite filament This is preferable because the filaments are arranged inside and the effect of mixed fibers with different fineness becomes more obvious. Regarding the difference in heat shrinkage rate, it is preferable that the boiling aberration is within 4% and the dry aberration at 200° C. under no load is a factor of 10 or more, since there is no blistering during scouring and good bulkiness is imparted.

Suitable cap devices for producing the composite filament ()
It is possible to use the apparatus described in No. 1, etc., and it is also possible to manufacture composite filaments X and Y at the same time from one die.

As explained above, the mixed fiber multifilament yarn of the present invention is made of mixed fiber yarns with large differences in fineness, and is soft and has a high waist, tension, moderate squeaky feeling, elegant luster, and high-quality texture such as 1. This is a polyester blend multifilament yarn suitable for woven and knitted fabrics, which has the characteristics required for knitted fabrics. It is particularly suitable for mixed fiber multifilament yarns containing ultrafine filaments with a fineness of 1 denier or less.

In addition, the mixed fiber multifilament yarn of the present invention can be produced stably and at low cost by the simultaneous spinning method using a simple spinneret, is easy to handle up to alkaline aqueous solution treatment, and can be easily manufactured by alkaline aqueous solution treatment. This can be carried out extremely quickly, and furthermore, it is also possible to separate the segments of the poorly alkali-soluble polyester B after the composite filament X has been divided into independent entities without the occurrence of bonding between the segments. The present invention will be specifically described below with reference to Examples.

Example 1 Alkali easily soluble polyester A for composite filament
Intrinsic viscosity in ornochlorophenol at 25℃ as 0.5
Ethylene 5-sodium sulfoisophthalate) (5
Polyethylene terephthalate with an intrinsic viscosity of 066 in orthochlorophenol was used as the slightly alkali-soluble polyester B, and the ratio of polyester C:polyester B was set to 20:80. A trilobal cross-section yarn of three-split type was obtained as shown in FIG.

The poorly alkali-soluble polyester C for composite filament Y was the same polymer as polyester B, and the easily alkali-soluble polyester D was ethylene 5-sodium sulfoinophthalate (3 mol%) with an intrinsic viscosity of 0.55 in orthochlorophenol. ) / ethylene terephthalate (
97 mol %) copolymer and the ratio of polyester C:polyester D was set to 85=15 to obtain a trilobal cross-sectional yarn as shown in FIG.

As a spinneret for composite filaments X and Y, one spinneret having 16.12 discharge holes for each composite filament was used, the spinning temperature was 290°C, and the spinning speed was 1.
Spinning at 100 In/min, followed by drawing speed 6-
00 m/min, hot roll 85℃, hot plate 1
It was drawn at 30° C. and at a draw ratio of 3.3 times to obtain a mixed multifilament drawn yarn consisting of composite filament X of 67.5 denier 16 filaments and composite filament Y of 3 denier 12 filaments. The drawn yarn had virtually no fuzz or sag, and the interfilaments were well-formed.

The surface length of one polyester D segment in the cross section of the composite filament Y is 1.6μ, the depth is 3μ, and the ratio of the length to the surface length of the linear molecule U is 80μ.

The warp and weft density of this drawn yarn is 110 yarns/inch and 90 yarns/inch.
The tack was woven as a book/inch. Weavability was good with no particular problems. Subsequently, alkali treatment was performed at a NaOH concentration of 50 g/l at 100°C to form composite filament X.
After completely dissolving and removing polyester A and dividing it, each segment of polyester B (approximately 0.6 densities) exists independently in the cross section of the fabric, and polyester D is separated from composite filament Y. A portion of the filament was dissolved and removed to obtain a filament of approximately 2.7 denier having three grooves on its surface with a groove width of 1.8 μm and a depth of 18 μm.

Fabrics obtained by conventional dyeing and finishing of polyester have a soft feel similar to similar fabrics made only of 0.6 denier filaments, and similar to similar fabrics made only of 2.7 denier trilobal cross-section filaments. It was a high-quality silky fabric that had elasticity, resilience, and tension, as well as a moderate feel of texture, silky sound, elegant luster, resistance to wax/wax, and excellent color development.

Comparative Example 1 Silk production and weaving were carried out in the same manner as in Example 1, except that instead of the composite filament Y in Example 1, a 3-5 denier 12-filament trilobal cross-section yarn made only of polyethylene terephthalate with an intrinsic viscosity of 0.66 was used. A woven fabric was obtained by treatment with aqueous alkaline solution and dyeing finishing, but it was inferior to the woven fabric of Example 1 in terms of texture and color development.

Comparative Example 2 A woven fabric was obtained by weaving, alkaline aqueous solution treatment, and dyeing finishing according to Example 1 using a drawn yarn of 75 denier 24 filaments consisting only of the composite filament Y of Example 1. It was too strong, had a very shiny shine, and had the disadvantage of easily becoming 7W, and was inferior in quality and practicality.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views showing an example of the composite filament X constituting the mixed fiber multifilament yarn of the present invention, and FIGS. 3 and 4 are cross-sectional views showing an example of the composite filament X constituting the mixed fiber multifilament yarn of the present invention. 1 is a cross-sectional view showing an example of a composite filament Y having 1, . 11 FIG. 5 is a diagram illustrating the shape of one alkali easily soluble polyester segment in the cross section of the composite filament Y. Outer rod applicant Toshi Co., Ltd. Figure 1 Figure 2 Figure 6 Figure 4 ↓ Figure 5

Claims (2)

[Claims] (1) A composite filament x having a cross-sectional shape in which slightly alkali-soluble polyester B is divided into a plurality of pieces by alkali-easily soluble polyester A, and a plurality of alkali-easily soluble polyesters D are divided into a plurality of pieces by slightly alkali-soluble polyester C. 7) A mixed fiber yarn with a composite filament Y having a divided cross-sectional shape, and the fineness of the segment of the slightly alkali-soluble polyester B constituting the composite filament x is such that the fineness of the segment of the composite filament A polyester blend multifilament yarn characterized by a small fineness of polyester C. (2) The polyester mixed fiber multifilament yarn according to claim (1), wherein the fineness of the composite filament X is smaller than the fineness of the composite filament Y.