JPS6316484B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for producing a two-component composite yarn, and more particularly to a method for producing a two-component composite yarn that can easily produce irregular cross-section yarn suitable for woven or knitted fabrics having a crisp texture. After scouring and removing sericin in the form of thread, the pre-sneaked silk fabric obtained by weaving has an excellent silkiness and texture.
It has been widely used due to its two major characteristics. Woven and knitted fabrics obtained from synthetic fibers usually have a strong slimy feel and do not have the crisp feel of pre-milled silk fabrics. Although there has been some success in adding twists to the threads or applying fusing processes to give synthetic fibers a slick feel, they have drawbacks such as high processing costs and poor quality. In addition, it is possible to impart a certain degree of slickness to woven or knitted fabrics by changing the cross-sectional shape of the synthetic fibers to a 5- to 8-lobed cross-section or a cross-section with a high degree of irregularity, but it is possible to impart a certain degree of shirkiness to woven or knitted fabrics, but it is not possible to give the woven or knitted fabrics a certain level of shirtness. It has not yet been granted. Moreover, most of the methods for producing yarns with irregular cross-sections are done by devising the shape of the discharge hole of the spinneret. It is necessary to greatly deform the shape of the discharge hole of the spinneret and rapidly cool the spun yarn, but there is a limit to the degree of deformation, and the smaller the fineness, the more difficult it becomes. There is a drawback that spinning properties deteriorate. As a technique to improve the drawbacks of these conventional techniques, Japanese Patent Publication No. 39-29636 discloses that by dissolving and removing the other component of a split-type composite yarn in which one component is divided into a plurality of pieces, the other component is divided into a plurality of pieces. A technique for producing threads with irregular cross sections has been disclosed. Among the examples in this patent, there is an example in which a split-type composite yarn is treated with formic acid using polyethylene terephthalate as one component and nylon 66 as the other component, and the nylon 66 is dissolved and removed to obtain a four-lobed cross-section yarn, but polyethylene terephthalate and nylon In the split type composite yarn consisting of polyamide 66, both components are easy to peel off, and problems such as yarn breakage due to peeling occur during processes such as spinning, drawing, knitting, and weaving before dissolving treatment, and furthermore, it is difficult to dissolve the polyamide. The disadvantage of this method is that it requires a highly corrosive acidic solution. In addition, a split composite yarn in which one component is a copolymer of polyethylene terephthalate and polyethylene oxide glycol and the other component is polyethylene terephthalate is treated with a caustic soda aqueous solution,
There is an example of dissolving and removing the copolymer to make a split yarn made of polyethylene terephthalate, but here, if the polymer of one component and the other component is replaced, it is made into a split type composite yarn, and treated with an aqueous solution of caustic soda, it is made into a multi-lobed cross-section yarn. However, when such a copolymer is used, it cannot be completely eluted unless a large amount of polyethylene oxide glycol is copolymerized, and if a large amount is used, there is a drawback that the spinning property is deteriorated. Furthermore, the cross-sectional shape of the yarn after the other component has been dissolved and removed has the drawback of emphasizing the slickness and not giving any consideration to preventing glare. Furthermore, in Japanese Patent Publication No. 53-37927, the first component has a thin radial part that branches radially from the center of the cross section of the filament, and a wedge-shaped part whose tip is directed toward the center of the filament. A split composite yarn is disclosed in which the second component is split and joined into independent segment portions by a radial portion, and each segment portion is joined to a corresponding wedge portion. However, the spinnerets for producing such splittable composite yarns must be complicated, and the disadvantages are that stable composite spinning is difficult, and that the components have poor mutual affinity. Or, it only lists general examples of polymers with different solubility or degradability, and there are disadvantages in that there is no consideration given to preventing troubles due to peeling between components in the high-order processing process of yarn spinning, and furthermore, it is the first in textile and knitted fabrics. When the component was removed, the remaining second component exhibited a glaring luster because the plane that had been in contact with the radial portion came out on the outer periphery, resulting in poor quality. The inventors of the present invention have conducted intensive studies on two-component composite yarns that can improve the shortcomings of the prior art as described above and easily produce yarns with irregular cross-sections that are suitable for woven and knitted fabrics with a crisp texture. This led to the present invention. That is, the present invention provides a method for spinning a two-component composite yarn in which one component of the composite yarn has a center of gravity and a cross section in which the other component is divided into a plurality of pieces using a composite spinneret. It is composed of a hole, a lower opening, a discharge hole, and an inflow hole reaching the inner peripheral surface of the lower opening, and the inflow hole on the inner peripheral surface of the lower opening is between the ends of the radially formed holes. Using the positioned composite spinneret device, one component of the polymer is supplied from the upper opening and the other component is supplied from the inflow hole and spun, and the other component is spun into a tapered yarn whose width gradually decreases toward the inside of the yarn. A two-component composite having a wedge-like shape and characterized in that the polymer forming one component is polyester or polyamide, and the polymer forming the other component is a polyester copolymerized with 2.4 mol% or more of metal sulfonate-containing ester units. This is a method of manufacturing thread. The present invention will be explained in detail below. The type of polyester forming one component in the present invention includes aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid, phthalic acid, and naphthalene-2,6-dicarboxylic acid, or aliphatic carboxylic acids such as adipic acid and sebacic acid, or aliphatic carboxylic acids such as adipic acid and sebacic acid. It is a polyester synthesized from esters and diol compounds such as ethylene glycol, diethylene glycol, 1,4-butanediol, neopentyl glycol, and cyclohexane-1,4-dimethanol, and in particular, 80 mol% or more of the constituent units are ethylene. Polyesters having terephthalate units are preferred. Further, polyalkylene glycol, glycerin, pentaerythritol, methoxypolyalkylene glycol, bisphenol A, sulfoisophthalic acid, etc. may be added to or copolymerized with the above polyester component. However, when a metal sulfonate is contained, it is preferably 3 mol% or less based on the acid component contained in the polyester, and 3 mol% or more less than the amount of sulfonate in the other component. The polyamide polymer forming one component in the present invention is nylon 6, nylon 66, nylon 4, nylon 5, nylon 10, nylon 11, nylon 12, nylon 6-10, polyamide having an aromatic ring, polyamide having an alicyclic ring, Polyamides containing heteroartic rings, polyamides containing heteroatoms,
It means copolymerized nylon, etc., especially nylon 6,
Nylon 66 can be suitably used. The polyester forming the other component of the composite yarn of the present invention is:

Contains the structural unit of [Formula] It is a thing,

[Formula] is a metal sulfonate salt of a divalent arylene group, or a metal sulfonate salt of a divalent alkylene group such that -X- is separated from the -So ₃ M group by at least three atoms. Yes, there is also -X-

[Formula] -O- (CH ₂ )n[O(CH ₂ )n]m-O- and

[Formula] is a divalent group selected from the group consisting of, and -Y- is the same as -X- or hydrogen. The metal sulfonate is preferably introduced by replacing one hydrogen of the acid component forming the polyester. Note that n and m are integers, n is greater than 1, and M is a metal. A preferred class of main components of these polyesters is terephthalic acid or its ester-forming derivatives and formula HO(CH ₂ ).
Polymethylene glycol with pOH (but
p is an integer of 2 to 10), and polyethylene terephthalate is preferred.
Polyesters containing sulfonate metal salt derivatives can also contain up to about 10 mole percent of glycols or other esters or oxycarboxylic acids. Examples of the compounds that may be contained include aromatic dicarboxylic acids such as isophthalic acid, phthalic acid, and naphthalene-2,6-dicarboxylic acid as acid components, and aliphatic dicarboxylic acids such as adipic acid and adipic acid and sebacic acid. Diethylene glycol as diol,
Examples include 1,4-butanediol, neopentyl glycol, and cyclohexane-1,4-dimethanol. In addition, as a polyester containing metal sulfonate, 2.4 mol% or more of the total structural units are ethylene 5
- Sodium sulfoisophthalate, and
Polyester containing 70 mol% or more of ethylene terephthalate can be suitably used. Further, the copolymerization amount of the metal sulfonate-containing ester unit is preferably 3 mol% or more, and in order to stably spin a two-component composite yarn, it is preferably 20 mol% or less, more preferably 10 mol% or less. In addition, well-known additives such as matting agents, antioxidants, fluorescent whitening agents, flame retardants, ultraviolet absorbers, etc. may be added to the polymers forming one component and the other component to the extent that they do not impede the effects of the present invention. It is also possible to contain agents. In the present invention, when spinning a two-component composite yarn with a composite spinneret, it is composed of an upper opening, a radially formed hole, a lower opening, a discharge hole, and an inflow hole reaching the inner peripheral surface of the lower opening, Using a composite spinneret device in which the inlet hole in the inner circumferential surface of the lower opening is located between the ends of the radially formed holes, one component of the polymer is passed through the upper opening and the other component is injected. It is necessary to feed each polymer from the inflow holes and spin the other component into a tapered wedge-like shape whose width gradually decreases in the direction toward the interior of the yarn. A spinneret device that can preferably manufacture a composite yarn having such a cross-sectional shape will be described with reference to the drawings.
FIG. 7 is a sectional view of a die device for manufacturing a composite yarn having the cross-sectional shape shown in FIG. 2, and is made up of an upper plate 1 and a lower plate 2. In the figure, A is the polymer of one component, and B is the polymer of the other component. Polymer A passes through the upper opening 3 of the upper plate 1 and the radially formed holes 4 and flows into the lower opening 8 of the lower plate 2. On the other hand, the polymer B flows from the fluid reservoir 5 between the upper plate 1 and the lower plate 2 through the inflow hole 7 formed by the protrusion groove 6, and flows into the lower opening 8 of the lower plate 2. Here, the shape of the radial forming hole 4 is as shown in FIG. 8, and the inlet hole 7 is formed by forming three grooves radially in a concentric flat part on the upper surface of the lower plate 2, as shown in FIG. and the lower surface of the upper plate 1. The number of radial portions of the radially formed holes corresponds to the number in the cross section of the other component. In the present invention,
As mentioned above, the number of the other component in the cross section is
Since it is composed of two or more pieces, the number of radial parts is two or more. When the number of radial parts is 2,
This also includes a shape in which the radially formed holes are linear. The other component, polymer B, which has flowed into the lower opening 8 of the lower plate 2 is divided into three parts by the one component, polymer A, and the cross-sectional shape of the composite yarn discharged from the discharge hole 9 is as shown in FIG. It will be like this. It is well understood that a composite yarn having a cross-sectional shape as shown in FIGS. 1 and 3 can be easily obtained by appropriately changing the shapes of the radially formed holes 4, the inflow holes 7, the discharge holes 9, etc. When the composite yarn is passed through a process such as spinning, drawing, knitting, or weaving prior to dissolving and removing the other component, the occurrence of fuzz or yarn breakage is not preferable because productivity in each process decreases. Among these processes, the process that is most likely to cause fuzz and yarn breakage is when composite yarns are used as warp yarns of textiles. At that time, the composite yarns are repeatedly rubbed by reeds or heddles on the loom, and one side of the composite yarns is If the peeling resistance of one component and the other component is low, both components will peel off, and the peeled single fibers or fibrils will be cut and become fluff.
Furthermore, more fuzz is generated, leading to breakage. In order to avoid warp yarn breakage and improve weavability, it is preferable to increase the amount of metal sulfonate contained in the other component forming the composite yarn. Warp thread 10 ⁶ is a guideline for good weavability.
It becomes possible to reduce the number of yarn breakages per m to one or less. Further, the faster the solubility of the other component forming the composite yarn by alkali treatment is, the better, and as the amount of metal sulfonate contained in the other component increases, the dissolution time of the other component becomes faster. Furthermore, the dissolution time rapidly decreases at around 2.4 mol %, and from the viewpoint of dissolution rate, it is necessary that the other component is a polyester polymer containing 2.4 mol % or more of metal sulfonate-containing ester units. An example of a cross section of a two-component composite yarn obtained by the present invention will be explained with reference to the drawings. 1 to 3 are diagrams showing typical cross sections of a two-component composite yarn obtained by the present invention. In Figure 1, one component A causes the other component B to
The component B is divided into two parts, and the other component B has a tapered wedge shape whose width gradually decreases in the direction of the yarn center, and is arranged in two opposing positions. By dissolving and removing the other component B from the composite yarn having such a shape, the one component becomes 2 as shown in FIG. 4 with little or no change in shape.
It is possible to create a bilobal cross-section yarn with a large degree of deformation, as if the central portions of two semicircular straight portions were joined together. The composite yarn illustrated in FIGS. 2 and 3 is
One component A divides the other component B into three and six parts, respectively, at approximately equal intervals, and the other component B has a tapered wedge shape whose width gradually decreases in the direction of the yarn center. By dissolving and removing the other component B from these composite yarns, the one component becomes three-lobed and six-lobed with a large degree of deformation as shown in Figures 5 and 6, respectively, with little or no change in shape. It is possible to have cross-sectional threads.
The shape of the other component needs to be in the shape of a tapered wedge whose width gradually decreases in the direction toward the inside of the yarn in order to exhibit a glossy taste without producing a glare. If the width is substantially constant or increases in the internal direction of the thread, the irregular cross-section thread obtained by dissolving and removing the other component will be affected by the external force of the protruding portion sandwiched between adjacent grooves. Since it has the disadvantage that it is easily deformed when stretched, and that it is easily broken if it is stretched too far, the shape of the other component needs to be a tapered wedge shape whose width gradually decreases in the direction toward the inside of the yarn. In the present invention, the ratio of one component to the other component forming the composite yarn, that is, the composite ratio, is such that the degree of irregularity changes greatly depending on the amount of the other component,
The weight ratio of one component to the other component is preferably in the range of 60:40 to 99:1, more preferably in the range of 70:30 to 98:2. The shape of the cross-sectional outer periphery of one component of the composite yarn in the present invention that is not in contact with the other component is not particularly limited, but when the other component is removed, a flat portion is formed on the outer peripheral surface that is convex outward when viewed from the center of the yarn. It is preferable that the surface is not flat, as it will give a glaring luster.
For this reason, it is preferable that the cross-sectional outer periphery of the composite yarn has a circular shape. Furthermore, it is a matter of course that one component is integral in the cross-section of the composite yarn including the center of gravity, and it is necessary that the other component remains integral even after removal of the other component. The number of the other component in the cross section, which has a tapered wedge-like shape whose width gradually decreases in the direction of the yarn center, is not particularly limited as long as it is 2 or more, but if it exceeds 20, stable composite spinning becomes difficult. Preferably, the number is 20 or less. As for the shape of the other component, the wedge degree K and the groove degree H are sufficient to give the woven or knitted fabric after removing the other component a smooth taste, good gloss, and a stable cross-sectional shape that is stable against external forces. It becomes a factor. FIG. 10 is a model diagram for explaining the wedge degree K and groove degree H in the yarn cross section. That is,
In Fig. 10, the wedge degree K is determined by defining the line segment between the center of gravity G of the yarn and the point X that is farthest from the center of gravity G in one other component B as GX, and the line between the center of gravity G and the point Y closest to the center of gravity G. When the minute is GY, it is defined by the length ratio of the line segment GX/GY (=K),
It is preferably in the range of 1.2≦K≦15, and 1.5≦
It is more preferable that K≦6. The groove degree H is the maximum groove width S of one other component B, which is the line segment connecting the boundary points on the outer periphery of both components.
If the perpendicular line T to the line segment is drawn from the point Y closest to the center of gravity among the other components, the ratio of the lengths of each line segment S/T (=H) is defined, and 0.08≦K
It is preferably in the range of ≦0.8. In addition, the ratio of the length of one line segment of the other component to the outer circumference of the composite yarn is preferably 8% or less, and 5% or less, in order to prevent glare from occurring in the woven or knitted fabric after the removal of the other component. It is more preferable that Similarly, the ratio of the sum of the lengths of the line segments S of the other component in one cross section to the outer circumference of the composite yarn is 30
% or less, more preferably 25% or less. As explained above, the two-component composite yarn obtained by the present invention is easy to handle until the other component is dissolved and removed, and the dissolution and removal can be carried out extremely quickly. It has a sufficient degree of irregularity in the cross section, the cross-sectional shape is stable against external forces, and it is possible to give the woven or knitted fabric an appropriate level of gloss and a sufficient amount of shari.
In addition, it is possible to form a yarn with a fineness of 1 denier or less. In addition, conventionally, when a yarn with an irregular cross-section is false-twisted, the irregular cross-sectional shape before the false-twisting process changes greatly, making it difficult to obtain a yarn with a desirable luster. Although the cross-sectional shape of the yarn as a composite yarn changes even after false twisting, the cross-sectional shape of the yarn after dissolving and removing the other components maintains a large degree of irregularity, and the irregular cross-sectional shape resists external forces. It is possible to create a yarn that is stable and has a silky feel. The present invention will be specifically explained below with reference to Examples. Example 1 Nylon 6 with a sulfuric acid viscosity of 2.4 as one component, and ethylene 5-sodium sulfoisophthalate (2.4 mol%)/ethylene terephthalate (97.6 mol%) with an intrinsic viscosity of 0.60 in orthochlorophenol at 25°C as the other component. Polymerized polyester from 7th to
Using the spindle device shown in Figure 9, the spinning temperature was set at 280°C.
Composite spinning was performed at a spinning speed of 1100 m/min to obtain a bicomponent composite yarn having a cross section as shown in FIG.
In this two-component composite yarn, the ratio of one component to the whole is 85% by weight, the wedge degree K is 8.0, the groove degree H is 0.2, and the length of one line segment S of the other component is The proportion of the outer circumference of the yarn was 5%. Subsequently, normal stretching was performed at a stretching speed of 400 m/min, a hot pin of 100°C, and a stretching ratio of 3.4 times, resulting in 70 denier.
72 filament drawn yarn. This drawn yarn was made into taffeta through a normal weaving process for both vertical and horizontal weaving. After weaving, there are no parts of the yarn that make up the woven fabric where the two components have separated, and warp yarn breakage during weaving does not occur.
The number was 0.4 times/10 ⁶ m. Fabrics with NaOH concentration
After performing alkaline treatment with 30g/100°C aqueous solution for 20 minutes to completely dissolve and remove the other component, it was passed through the usual nylon 6 dyeing process. The resulting woven fabric had a silky feel similar to that of a pre-drawn silk fabric, had a moderate luster, was excellent in soft texture and feel, and had good dyeing uniformity. The yarn constituting the fabric was a 60 denier 72 filament, and its cross-sectional shape was as shown in FIG. Example 2 Polyethylene terephthalate with an intrinsic viscosity of 0.67 in orthochlorophenol at 25°C as one component, and ethylene 5-sodyursulfoisophthalate (5 mol%)/ethylene with an intrinsic viscosity of 0.57 in orthochlorophenol at 25°C as the other component. Using a terephthalate (95 mol%) copolyester polyester, composite spinning was carried out using the spindle device shown in Figs. 7 to 9 at a spinning temperature of 295°C and a spinning speed of 1000 m/min to obtain a cross section as shown in Fig. 2. A two-component composite yarn having the following properties was obtained. In this two-component composite yarn, the proportion of one component in the whole is 85% by weight, and the wedge degree K is
7.0, the groove degree H was 0.15, and the ratio of the length of the line segment S of one other component to the outer circumference of the composite yarn was 4%. Subsequently, stretching speed 400m/min, hot pin 120℃,
Stretching was carried out at a stretching ratio of 3.5 times to obtain a drawn yarn of 50 denier 48 filaments. This drawn yarn is vertically
When used as taffeta for weft use, the number of warp thread breakages during weaving was as low as 0.2 times/10 ⁶ m. In addition, there was no part of the threads constituting the fabric where both components were separated. Fabric with NaOH concentration of 30
After performing alkaline treatment with an aqueous solution at 100° C. for 25 minutes to completely dissolve and remove the other component, it was passed through the usual polyethylene terephthalate dyeing process. The obtained woven fabric had an excellent dry feel similar to that of pre-drawn silk fabric, moderate gloss, soft texture and feel, and good dyeing uniformity. The yarn constituting the fabric was a 41 denier 48 filament, and its cross-sectional shape was as shown in FIG. Comparative Example 1 Same as Example 1 except that 0.60 ethylene 5-sodium sulfoisophthalate (2.0 mol%)/ethylene terephthalate (98.0 mol%) copolyester was used as the other component in orthochlorophenol at 25°C. Spinning, drawing, and weaving were carried out according to the same procedure. When the drawn yarn was treated with an alkali, the time required to dissolve the other component was 45 minutes, about three times as long as in the case of the drawn yarn of Example 1. During weaving, both components peeled off, and due to the peeling, fuzz and warp yarn breakage occurred, and warp yarn breakage was poor at 2.5 times/10 ⁶ m. Furthermore, it took an extremely long time of 60 minutes to completely remove the other components by treating the fabric with an alkali.

[Brief explanation of the drawing]

1, 2, and 3 show examples of cross-sectional shapes of two-component composite yarns obtained by the present invention, and FIGS.
3 shows a cross-sectional shape of an irregular cross-section yarn obtained by dissolving and removing the other component from the two-component composite yarn shown in FIGS. 2 and 3. FIG. FIG. 7 is a sectional view of a cap device that can preferably produce a two-component composite yarn in the present invention, and FIGS. 8 and 9 respectively show the shape of the radially formed hole in the upper plate of the cap device of FIG. It shows the shape of the inlet hole provided in the lower plate. 1st
Figure 0 is a model diagram for explaining the wedge degree K and groove degree H in the yarn cross section. DESCRIPTION OF SYMBOLS 1... Upper plate, 2... Lower plate, 3... Upper opening, 4... Radial formation hole, 5... Liquid reservoir, 6... Projection, 7... Inflow hole, 8... Lower opening, 9... Discharge hole, A... One component, B...the other component.

Claims (1)

[Scope of Claims] 1. When spinning a two-component composite yarn with a composite spinneret having a cross section in which one component of the composite yarn includes the center of gravity and the other component is divided into a plurality of pieces, an upper opening, It consists of a radially formed hole, a lower opening, a discharge hole, and an inflow hole that reaches the inner peripheral surface of the lower opening, and the inflow hole on the inner peripheral surface of the lower opening is connected to the end of the radially formed hole. Using a composite spinneret device located between them, one component of the polymer is supplied from the upper opening and the other component is supplied from the inflow hole and spun, and the other component is gradually decreased in width in the direction of the inside of the yarn. The polymer forming one component is polyester or polyamide, and the polymer forming the other component is 2.4 mol%.
A method for producing a two-component composite yarn, characterized in that the above metal sulfonate-containing ester unit is copolymerized into a polyester. 2. The polymer forming the other component is a polyester comprising 2.4 mol% or more of ethylene 5-sodium sulfoisophthalate units and 70 mol% or more of ethylene terephthalate units. Method for manufacturing component composite yarn.