JP7144168B2 - Polyester mixed yarn, woven and knitted fabric, and method for producing polyester mixed yarn - Google Patents

Description

The present invention relates to a mixed polyester yarn. Further, the present invention relates to a woven or knitted fabric containing such a mixed polyester yarn and a method for producing the mixed polyester yarn.

BACKGROUND ART In recent years, in the field of clothing, textured yarn having a heathered tone with a warm appearance like wool is widely used (for example, Patent Document 1). Examples of heathered yarns include those obtained by mixing and entangling polyester multifilaments that are non-dyeable with cationic dyes and polyester multifilaments that are dyeable with cationic dyes. A wool-like appearance can be obtained by dyeing a fabric containing such a heathered yarn with a cationic dye.

Japanese Patent Application Laid-Open No. 2002-115140

However, when the technique described in Patent Document 1 is used, the heathered tone is expressed due to the dyeing difference in the yarn, so the shade is too strong and causes irritation, or the glare (glossiness) is excessive. There are cases where the natural and delicate heathered tone does not appear. In addition, the feeling of swelling may be excessive, and the feeling of crispness or stiffness may be poor.

As a result of intensive studies to solve the above-mentioned problems, the inventors of the present invention have found a polyester mixed filament yarn obtained by mixing and entangling a polyester multifilament A and a polyester false twist crimped yarn B, which is composed of constituent fibers. A single yarn with a specific cross-sectional shape expresses a natural and delicate heathered tone with suppressed glare, and because the filling rate of the constituent fibers is increased, it does not become a flowing heathered tone, and false twisted yarn is used. As a result, the present inventors have found that the mixed polyester yarn provides a woven or knitted fabric with excellent crispness and elasticity, even if it is excellent in bulkiness, and completed the present invention.

That is, the gist of the present invention is the following (1) to (8).
(1) A polyester mixed filament yarn obtained by mixing and entangling a polyester multifilament A and a polyester false twisted crimped yarn B, wherein both the polyester multifilament A and the polyester false twisted crimped yarn B are A cross-sectional shape obtained by cutting a single yarn perpendicularly to the longitudinal direction of the fiber exhibits an irregular cross-sectional shape having 3 to 6 protrusions, and the irregularity of the polyester multifilament A is the same as the polyester false twist winding. The irregularity of the polyester multifilament A is lower than that of the crimped yarn B, and the irregularity of the polyester multifilament A is in the range of 20 to 60%, and the irregularity of the polyester false twisted crimped yarn B is in the range of 35 to 70%.
(2) The L* value of the polyester false twisted crimped yarn B is higher than the L* value of the polyester multifilament A, and the L values of the polyester multifilament A and the polyester false twisted crimped yarn B are * The polyester mixed yarn of (1), characterized in that the difference in values (ΔL* value) is 3.0 or more.
(3) The polyester blend of (1) or (2), wherein both the polyester multifilament A and the polyester false-twisted crimped yarn B exhibit a modified cross-sectional shape having six projections. filament.

(4) The polyester according to any one of (1) to (3), wherein the mass ratio of the polyester multifilament A and the polyester false twist crimped yarn B is 30/70 to 70/30. Mixed yarn.
(5) The polyester mixed yarn according to any one of (1) to (4), wherein the crimp ratio of the polyester false twisted crimped yarn B is 30 to 70%.
(6) The polyester mixed yarn of any one of (1) to (5), wherein the number of entanglements is 20 to 120/m.

(7) A woven or knitted fabric characterized by containing the polyester mixed yarn of any one of (1) to (6) in an amount of 20% by mass or more in the total constituent fibers.
(8) A method for producing a polyester mixed yarn, characterized by including the following steps (a) to (d).
(b) Highly oriented undrawn polyester having a cross-sectional shape obtained by cutting a single yarn perpendicularly to the longitudinal direction of the fiber exhibits a modified cross-sectional shape with 3 to 6 protrusions and an irregularity of 20 to 60%. The cross-sectional shape obtained by cutting the yarn A and the single yarn perpendicularly to the longitudinal direction of the fiber has an irregular cross-sectional shape with 3 to 6 protrusions, and the irregularity is 20 to 60%. A step of preparing a drawn yarn B (b) Cold drawing the polyester high-density undrawn yarn A at a temperature below the glass transition point and a draw ratio of 1.15 to 1.40 times to form a polyester multifilament A ( C) A step of drawing and false twisting the polyester highly oriented undrawn yarn B at a temperature of 200 to 300° C. and a false twist ratio of 1.40 to 1.80 to form a polyester false twisted crimped yarn B (d) the polyester mulch A step of combining the filament A and the polyester false-twisted crimped yarn B by fluid jet processing to form a polyester mixed yarn.

The polyester mixed yarn of the present invention is obtained by mixing and entangling the polyester multifilament A having a specific single filament cross-sectional shape and the polyester false twisted crimped yarn B, so that the filling rate of the constituent fibers is increased. The fabric obtained by weaving and knitting and dyeing the polyester mixed yarn of the present invention does not have a heathered tone, and even if it is excellent in bulkiness, it has an appropriate crispness and stiffness. Because it does not have glare, it is possible to express a more natural and delicate heather tone with less glare.

It is a schematic diagram explaining how to obtain|require irregularity of this invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic process diagram showing one embodiment of the method for producing a polyester mixed yarn of the present invention. 1 is a cross-sectional photograph (magnification: 230 times) of the polyester mixed yarn of the present invention obtained in Example 1. FIG.

The present invention will be described in detail below.
[Polyester mixed yarn]
The polyester mixed yarn of the present invention is obtained by mixing polyester multifilament A and polyester false-twisted crimped yarn B and interlacing them.

(Polyester multifilament A) (Polyester false twist crimped yarn B)
The polyester multifilament A is composed of a polyester fiber as a single yarn, and the cross-sectional shape obtained by cutting the polyester fiber perpendicularly to the longitudinal direction of the fiber is an irregular cross-sectional shape having 3 to 6 protrusions. The polyester false-twisted crimped yarn B is also made of polyester fiber as a single yarn, and the cross-sectional shape of the polyester fiber cut perpendicular to the longitudinal direction of the fiber has an irregular cross-section having 3 to 6 protrusions. Shape.

The irregularity of the cross-sectional shape of the polyester multifilament A is lower than the irregularity of the cross-sectional shape of the polyester false-twisted crimped yarn B. In order to obtain such an irregularity, for example, a manufacturing method as described below is employed. In such a manufacturing method, the cross section of the single yarn of the polyester multifilament A is obtained by cold drawing the highly oriented undrawn yarn, and unlike the false twisting at the same time of drawing, the stress due to heat and twisting is not applied, so the cross-sectional shape does not collapse. On the other hand, polyester false-twisted crimped yarn B is obtained by stretching and simultaneously false-twisting a highly oriented undrawn yarn. method is adopted.

The irregularity of the cross-sectional shape of the polyester multifilament A is 20 to 60%, preferably 20 to 55%, more preferably 25 to 40%. The irregularity of the cross-sectional shape of the polyester false-twisted crimped yarn B is 35 to 70%, preferably 40 to 65%, more preferably 40 to 60%. If either the polyester multifilament A or the polyester false-twisted crimped yarn B has an irregularity outside the above range, a natural and delicate heathered tone with suppressed glare cannot be obtained, resulting in insufficient crispness. becomes. More specifically, when the irregularity of the polyester multifilament A is less than 20%, crispness and suppression of gloss (glare) are poor, and when it exceeds 60%, crispness is excessive. On the other hand, when the irregularity of the polyester false-twisted crimped yarn B is less than 35%, crispness and glossiness (glare) are poorly suppressed, and when it exceeds 70%, the crispness becomes excessive. Further, in the present invention, from the standpoint of being able to provide a crisper feel and further suppress gloss, (the irregularity of the polyester multifilament A)/(the irregularity of the polyester false-twisted crimped yarn B) = 0.50 to 1.50. It is preferably 0, more preferably 0.60 to 0.80.

The irregularity in the present invention will be described with reference to FIG. That is, the degree of irregularity is obtained from the following formula from the ratio of the diameter R of the circumscribed circle and the diameter r of the inscribed circle in the irregular cross-sectional shape. Here, in the irregular cross-sectional shape, among the circles that can be drawn by contacting (circumscribing) points outside the shape, the circle that can be drawn by contacting (circumscribing) the largest number of points and has the smallest diameter is defined as the circumscribing circle. Of the circles that can be drawn by contacting (inscribed) at least three points inside, the circle with the largest diameter is called the inscribed circle. As the irregularity in the present invention, the average value of all constituent fibers is adopted.
(Irregularity) (%) = [(Rr)/R] x 100 (%)

In the present invention, the polyester multifilament A and the polyester false-twisted crimped yarn B described later have a modified cross-sectional shape having 3 to 6 protrusions, so that a woven or knitted fabric has an appropriate crispness. , the effect of expressing a natural and delicate heathered tone with reduced stiffness and glare. In particular, the number of protrusions is preferably 5 to 6, more preferably 6.

Here, the polyester false-twisted crimped yarn B is false-twisted. By subjecting the yarn to false twisting, the yarn is crimped and has a high bulkiness compared to the state of the raw yarn. On the other hand, it tends to be inferior in elasticity and stiffness, but in the present invention, since fibers having an irregular cross-sectional shape are used, the packing property between the constituent fibers is increased, so that the flowing heathered tone does not occur. It also has excellent elasticity. In addition, by subjecting the polyester false-twisted crimped yarn B to the false-twisting process, the difference in orientation from the polyester multifilament A to which the false-twisting process has not been performed becomes appropriate, and a difference in density dyeing occurs. It becomes excellent in heather tone.

Here, if the cross-sectional shape has two or less protrusions, crispness cannot be obtained, and glare on the surface of the fiber cannot be suppressed, so that a natural heathered tone cannot be expressed. Furthermore, since the filling property between the constituent fibers is lowered, it becomes a flowing heathered tone and does not give a feeling of elasticity. In addition, when the cross-sectional shape of the protrusions is seven or more, the crispness becomes excessive and the texture is poor.

Furthermore, in the present invention, since the polyester false-twisted crimped yarn B has a modified cross-sectional shape, the yarn is twisted in a post-process due to the synergistic effect of being a false-twisted crimped yarn and the cross-sectional shape of the single fiber. In particular, the cross-sectional shape of the single yarn enhances the filling of the constituent fibers, making it possible to obtain a fabric that is excellent in crispness and elasticity, does not become a flowing heather when dyed, and has a better heather. .

The polyester constituting the polyester multifilament A is not particularly limited, but examples include polyethylene terephthalate (PET) having ethylene terephthalate as a main repeating unit. Specifically, for example, in PET, ethylene terephthalate as a repeating unit preferably accounts for 90 mol % or more of all repeating units. Various dicarboxylic acid components, various aliphatic glycols, and the like may be copolymerized as the third component (copolymerization component) as long as the object of the present invention is not impaired.

As the polyester constituting the polyester false twist crimped yarn B, the same polyester as the polyester constituting the polyester multifilament A can be used.

The polyester multifilament A can be obtained by appropriately selecting the drawing conditions when the polyester highly oriented undrawn yarn A is drawn to form the polyester multifilament A, as in the method for producing the polyester mixed yarn of the present invention described below. , the decrease in filament strength can be suppressed, and the occurrence of fluff or yarn breakage can be suppressed even when subjected to friction or the like in a post-process (for example, a process such as weaving or knitting). On the other hand, the orientation does not progress too much in the internal structure of the fiber, and the yarn has an intermediate orientation. Therefore, the dyeability is higher than that of the polyester false-twisted crimped yarn B, which will be described later, resulting in a dark dyed portion. The fabric obtained by weaving and knitting and dyeing can develop a heathered tone.

In the prior art, after obtaining a composite yarn using a cationic dyeable polyester fiber and a cationic non-dyeable polyester fiber, a cationic dye is used to develop a heathered tone. In such a prior art, excessive irritation or glare occurs, and a natural and delicate heathered tone is not exhibited. However, in the present invention, for example, by adopting preferable manufacturing conditions, it is possible to express a difference in density dyeability by controlling the orientation of the constituent fibers, and without using a cationic dye, it is possible to easily heather by a conventional method. is achieved, and there is no irritation. Furthermore, as the constituent fibers, the polyester multifilament A having a specific single filament cross-sectional shape and the polyester false twisted crimped yarn B are mixed and entangled, so that the filling rate of the constituent fibers is increased, so that the flowing heathered tone is obtained. In addition, due to the light refraction effect of the cross-sectional shape of the fiber, glare on the surface of the fiber is suppressed. Tone can be expressed.

The single fiber fineness of the polyester multifilament A is not particularly limited, but is preferably 1.0 to 5.0 dtex, more preferably 1.5 to 4.5 dtex. When the single fiber fineness is 1.0 dtex or more, fluffing is less likely to occur in the post-process, and when it is 5.0 dtex or less, the filling of the constituent fibers is sufficient, the feeling of elasticity is excellent, and the flow and heathering is difficult to occur, and the crispness is further improved. It will be even better.

The total fineness of the polyester multifilament A is not particularly limited, but if the total fineness becomes too large when it is made into a polyester mixed yarn, the heathered tone becomes poor and it is suitable for clothing with crispness and coolness. Therefore, it is preferably 50 to 250 dtex, more preferably 60 to 150 dtex, even more preferably 80 to 110 dtex.

The number of filaments of the polyester multifilament A is not particularly limited, but the larger the number of fibers constituting the fiber, the more the filling property of the constituent fibers is improved, so that it is difficult to become a flowing heathered tone, and it has a crisp and firm feeling. 20 or more are preferable, and 20 to 40 are more preferable for further improvement.

The single fiber fineness of the polyester false-twisted crimped yarn B is not particularly limited, but is preferably 1.0 to 5.0 dtex, more preferably 1.5 to 4.5 dtex. When the single fiber fineness is 1.0 dtex or more, fluffing is less likely to occur in the post-process, and when it is 5.0 dtex or less, the filling property of the constituent fibers is increased, the flowing heathered tone is less likely to occur, and crispness and stiffness can be obtained. becomes easier.

The total fineness of the polyester false-twisted crimped yarn B is not particularly limited. preferably 50 to 200 dtex, more preferably 50 to 100 dtex. The total fineness of the polyester false-twisted crimped yarn B is preferably lower than the total fineness of the polyester multifilament A. As a result, the tangled state of the textured yarn is improved, and the adjustment of the heathered tone is further facilitated. The ratio of the total fineness of the polyester multifilament A and the polyester false twisted crimped yarn B is (total fineness of the polyester multifilament A )/(total fineness of polyester false-twisted crimped yarn B) = preferably 1.0 to 1.5, more preferably 1.20 to 1.35.

The number of filaments of the polyester false-twisted crimped yarn B is not particularly limited, but the larger the number of fibers constituting the fiber, the more the filling property of the constituent fibers can be improved, so that the crisp feeling can be obtained without flowing heather. , preferably 20 or more, more preferably 20 to 40, in order to further improve the feeling of elasticity.

The polyester false-twisted crimped yarn B is obtained, for example, by subjecting a highly oriented undrawn yarn to a multifilament having a cross-sectional shape having six protrusions and subjecting the same to a drawing and simultaneous false-twisting process. The method of false twisting at the same time as stretching is not particularly limited, but it is generally divided into a spindle method and a friction method. Preferred false twisting conditions are slightly different between the spindle method and the friction method, but either method may be used. .

The crimp ratio of the polyester false-twisted crimped yarn B is preferably 30 to 70%, more preferably 45 to 60%. When the crimp rate is 30% or more, the bulkiness is further excellent, and when the crimp rate is 70% or less, the crimp is not excessively high. (The ratio of the disk peripheral speed to the yarn speed) is in an appropriately low range, and the effect of the present invention, which is a natural and delicate heathered tone, is even more excellent, and problems in the processing process such as the occurrence of fluff in the textured yarn can be further suppressed. . On the other hand, the polyester multifilament A has substantially no crimps, for example, a crimp rate of less than 5%. A method for measuring the crimp rate will be described later in Examples.

The polyester multifilament A and the polyester false twist crimped yarn B are added with matting agents such as titanium oxide or various additives (for example, antistatic agents, antibacterial agents, antibacterial agents, etc.) within a range that does not impair the effects of the present invention. odorants, etc.) may be contained.

(Polyester mixed yarn)
The polyester mixed yarn of the present invention is obtained by combining the polyester multifilament A and the polyester false-twisted crimped yarn B by entangling the mixed fibers. By entangling, the constituent fibers are converged, and a heathered feeling is expressed when a woven or knitted fabric is formed.

The entangled state of the polyester mixed yarn is changed by changing the air pressure supplied to the interlace nozzle during mixing and the overfeed rate when the polyester multifilament A and the polyester false twist crimped yarn B are aligned and mixed. Therefore, various modifications are possible.

In the polyester mixed yarn of the present invention, the mass ratio of the polyester multifilament A and the polyester false twist crimped yarn B is preferably 30/70 to 70/30, and preferably 40/60 to 60/40. is more preferred, and 50/50 is even more preferred. When the mass ratio is within this range, the mixed yarn has a more excellent balance of heathered feeling between the dark dyed portion and the light dyed portion.

The polyester mixed yarn of the present invention preferably has an entanglement number of 20 to 120/m, more preferably 30 to 100. When the number of entanglements is 20/m or more, the entanglement state becomes difficult to untangle, the heathered tone develops more favorably, and the occurrence of unraveling failures during use becomes even more difficult. In addition, when the entangled state becomes difficult to unravel, it is possible to suppress the occurrence of misalignment inside the yarn due to the wear of the guide that is inevitably received in the manufacturing process of the woven or knitted fabric, and it becomes easier to suppress the defects of the woven or knitted fabric. On the other hand, when the entanglement number is 100/m or less, the polyester multifilament A and the polyester false-twisted crimped yarn B are not excessively entangled, and uneven dyeing is further suppressed, resulting in a more excellent natural and delicate heathered tone. Furthermore, since there is no need to excessively increase the air pressure supplied to the interlace nozzle during mixing, single yarn breakage, fluffing, etc. can be further suppressed. By setting the number of entanglements within the above range, it is possible to adjust the entanglement of the processed yarn, so that the heathered feeling when made into a woven or knitted fabric can be adjusted, the appearance and texture can be improved, and various manufacturing troubles can be suppressed. be able to.

In order to adjust the entanglement number, for example, the supply air pressure to the interlace nozzle and the overfeed rate of the interlace zone can be adjusted. In the present invention, the number of entanglements of the mixed entangled yarn is a value obtained by measuring based on the JIS L1013 8.15 hook method.

The polyester mixed yarn of the present invention can develop a natural and delicate heathered tone by making it into a woven or knitted fabric and subjecting it to a normal dyeing process. Here, the L* value and the K/S value at the time of tubular stitch dyeing can be used as indexes of the natural and delicate heathered tone. The K/S value at the time of tubular stitch dyeing is preferably 25 or more, more preferably 30 or more at the time of blue dyeing.

In order to set the above L* value and K/S value to specific ranges, constituent fibers having a specific cross-sectional shape are used, preferable manufacturing conditions are adopted, and the content of polyester mixed yarn is adjusted appropriately. It is possible to set a range, set the crimp rate to an appropriate range that is not too strong, and set the single fiber fineness of the constituent fibers to an appropriate range. Methods for measuring the K/S value and L* value will be described in detail in Examples.

Furthermore, in the present invention, the L* value of the polyester false twisted crimped yarn B is higher than the L* value of the polyester multifilament A, because a more natural heathered tone and a delicate heathered feeling are expressed. Preferably, the difference in L* value (ΔL* value) between the polyester multifilament A and the polyester false twist crimped yarn B is preferably 3.0 or more, more preferably 4.0 or more, It is more preferably 5.0 or more. The ΔL* value is preferably 7.0 or less, and more preferably 6.0 or less, in order to express a natural and delicate heathered tone and suppress irritability without excessive gradation difference. preferable.

[Woven and Knitted]
The woven or knitted fabric of the present invention preferably contains 20% by mass or more, more preferably 30% by mass or more, and 80% by mass or more of the polyester mixed yarn of the present invention as described above in all constituent fibers. More preferably, it contains 100% by mass.

When the woven or knitted fabric of the present invention is a woven fabric, its cover factor (CF) is not particularly limited, but preferably 1,500 to 3,000. The cover factor (CF) is a numerical representation of the density of a woven or knitted fabric, and is calculated by the following formula. Here, in the formula, D indicates the total fineness of the warp yarns. E indicates the total fineness of the weft.
CF = D ^1/2 × warp density (thread/2.54 cm) + E ^1/2 × weft density (thread/2.54 cm)

When the woven or knitted fabric of the present invention is a knitted fabric, the surface density is not particularly limited, but preferably 10 to 60 courses/2.54 cm and 45 to 100 wales/2.54 cm.

The structure of the woven or knitted fabric is not particularly limited, and an appropriate structure (plain weave, twill weave, satin weave for woven fabrics, multi-layered weave if necessary, circular knitted jersey, smooth, warp tricot for knitted fabrics, if necessary multiple organizations) can be employed.

In the woven or knitted fabric of the present invention, other fibers (for example, natural fibers such as cotton or hemp, synthetic fibers such as nylon, regenerated fibers such as rayon, etc., can be mixed within the range that does not impair the effects of the present invention. Especially from the viewpoint of texture, it is preferably mixed with cotton or hemp, and preferably mixed with elastic yarn to further improve heathered tone. Alternatively, various kinds of processing using a water-repellent agent or the like may be applied.

[Method for producing polyester mixed yarn]
An example of the method for producing the polyester mixed yarn of the present invention is described below.
The production method of the present invention includes the following steps (a) to (d).
(b) Highly oriented undrawn polyester having a cross-sectional shape obtained by cutting a single yarn perpendicularly to the longitudinal direction of the fiber exhibits a modified cross-sectional shape with 3 to 6 protrusions and an irregularity of 20 to 60%. The cross-sectional shape obtained by cutting the yarn A and the single yarn perpendicularly to the longitudinal direction of the fiber has an irregular cross-sectional shape with 3 to 6 protrusions, and the irregularity is 20 to 60%. step of preparing a drawn yarn B; (C) The polyester highly oriented undrawn yarn B is drawn and false twisted at a temperature of 200 to 300 ° C. and a false twist ratio of 1.30 to 1.80 times, and polyester false twist. Step of forming a crimped yarn B (d) Step of combining the polyester multifilament A and the polyester false twisted crimped yarn B by fluid jet processing to form a polyester mixed yarn.

Step (b) will be described below.
The polyester highly oriented undrawn yarn A as the supply yarn has 3 to 6 (preferably 5 to 6, more preferably 6) cross-sectional shapes obtained by cutting a single yarn perpendicular to the longitudinal direction of the fiber. The multifilament has an irregular cross-sectional shape with protrusions and an irregularity of 20 to 60% (preferably 20 to 55%, more preferably 25 to 40%). The polyester highly oriented undrawn yarn A becomes the polyester multifilament A in the obtained polyester mixed yarn.

The method for obtaining the polyester highly oriented undrawn yarn A is not particularly limited. It is obtained by a spinning method in which the fiber is spun at a temperature of up to 300° C., cooled, then oiled on its surface, and taken up by a take-up roller at a spinning speed of 2,000 to 4,000 m/min. PET may contain fine particles such as titanium oxide, if necessary.

The single fiber fineness of the polyester highly oriented undrawn yarn A is not particularly limited, but in order to make the single fiber fineness of the polyester multifilament A within the above range (1.0 to 5.0 dtex), it is 1.0 It is preferably ~5.0 dtex. The total fineness is also not particularly limited, but it is preferably 50 to 250 dtex in order to make the total fineness of the polyester multifilament A within the above range (50 to 250 dtex).

Also, the polyester highly oriented undrawn yarn B as the supply yarn will be described. The polyester highly oriented undrawn yarn B has 3 to 6 (preferably 5 to 6, more preferably 6) projections in a cross-sectional shape obtained by cutting a single yarn perpendicular to the longitudinal direction of the fiber. It is a multifilament having an irregular cross-sectional shape and an irregularity of 20 to 60% (preferably 20 to 55%). The method or spinning conditions for obtaining the polyester highly oriented undrawn yarn B are not particularly limited, but for example, the same method or spinning conditions as for the above-described polyester highly oriented undrawn yarn A may be used. The highly oriented undrawn polyester yarn B may have the same cross-sectional shape and physical properties as those of the highly oriented undrawn polyester yarn A, or may be different.
Further, the deformed cross-sectional shape of the highly oriented polyester undrawn yarn A and the highly oriented undrawn polyester yarn B as supply yarns is preferably rotationally symmetrical.

Even if the polyester highly oriented undrawn yarn A and the polyester highly oriented undrawn yarn B have similar irregularity or dyeability, by appropriately selecting the processing conditions of steps (b) and (c) The polyester multifilament A and the polyester false-twisted crimped yarn B contained in the obtained polyester mixed filament yarn exhibit a specific irregularity or dyeability, and thus exhibit the effects of the present invention. The highly oriented undrawn yarn B as the supply yarn becomes the polyester false-twisted crimped yarn B in the obtained polyester mixed yarn.

The single fiber fineness of the polyester highly oriented undrawn yarn B is not particularly limited, but in order to make the single fiber fineness of the polyester false twisted crimped yarn B within the above range (1.0 to 5.0 dtex), It is preferably between 1.8 and 6.5 dtex. In addition, the total fineness is not particularly limited, but in order to make the total fineness of the polyester false twist crimped yarn B within the above range (50 to 250 dtex), it is preferably 65 to 450 dtex, and 75 to 400 dtex. It is more preferable to have

Step (b) will be described below. That is, the high polyester ratio undrawn yarn A is subjected to cold drawing at a draw ratio of 1.15 to 1.40 times at a temperature below the glass transition point of the polyester constituting the high polyester ratio undrawn yarn A, It is referred to as polyester multifilament A. That is, cold stretching in the present invention means stretching at a temperature below the glass transition point. The glass transition point of polyester is generally 69-80°C. By cold-drawing the polyester highly oriented undrawn yarn A under specific conditions, the single yarn fineness can be finely adjusted to a more preferable one, and the mixing ratio of the polyester multifilament A and the polyester false twisted crimped yarn B and the heather of both can be adjusted. The adjustment (ie, the ΔL* value above) can also be fine-tuned to be more favorable.

In the step (b), the drawing temperature is a temperature below the glass transition point of the polyester constituting the highly oriented polyester undrawn yarn A. When the cold drawing temperature is lower than the glass transition point, the oriented crystallization does not proceed excessively, and the difference in density dyeability from the polyester false twist yarn B is sufficiently expressed, so that the heathered feeling is more emphasized. be done. In addition, the cross-sectional shape is less likely to collapse under the influence of stress due to heating, and the irregularity of the polyester multifilament A tends to fall within the above range.

In step (b), the draw ratio is 1.15 to 1.40 times, preferably 1.20 to 1.30 times. When the draw ratio is 1.15 times or more, the unstretched portion (residual unstretched portion) in the polyester multifilament A does not increase, and the residual unstretched portion is less likely to harden and embrittle by heat setting in post-processing. In addition, the texture does not easily become hard, and the decrease in strength can be further suppressed. On the other hand, if it is 1.40 times or less, the orientation of the polyester multifilament A does not proceed excessively, and a difference in dyeability from the polyester false twist yarn B tends to occur, and the heather tone tends to occur more easily.

As a result, the filling rate of the constituent fibers increases due to the synergistic effect of the difference in density dyeability, the cross-sectional shape of the single yarn, and the mixed entanglement of the polyester multifilament A and the polyester false twist crimped yarn B. Since glare is suppressed without causing flowing heather, the fabric obtained by weaving and knitting and dyeing can develop a more natural and delicate heathered tone. Moreover, it becomes excellent also in intensity|strength.

Step (c) will be described below. Step (c) is a step of forming a polyester false twisted crimped yarn B by subjecting the polyester highly oriented undrawn yarn B to draw false twisting (drawing and simultaneously false twisting).

In step (c), the draw ratio is 1.30 to 1.80 times, preferably 1.40 to 1.70 times. When the draw ratio is 1.30 times or more, the elongation of the false twisted crimped yarn does not become too high, and the physical properties of the false twisted crimped yarn are improved in post-processing (for example, a series of processing including dyeing processing). It is less likely to fluctuate, and the occurrence of troubles in terms of the quality of the woven or knitted fabric is further suppressed. In addition, a difference in dyeability from the polyester multifilament A is likely to occur. On the other hand, when the draw ratio is 1.80 times or less, yarn breakage during false twisting can be further suppressed.

Here, the draw ratio in the drawing step is, for example, the ratio of the surface speed of the first supply roller 1 to the surface speed of the first take-up roller 7 in FIG. surface speed of one supply roller 1).

The method of drawing false twisting is generally divided into a spindle method and a friction method. Preferred false twisting conditions slightly differ between the spindle method and the friction method, but either method for the polyester false twisted crimped yarn B may be used.

The machining speed in the spindle method is not particularly limited, but is preferably about 100 to 200 m/min, and the machining speed in the friction method is not particularly limited, but is about 200 to 700 m/min. preferable. The heater temperature is not particularly limited, but is preferably about 150 to 200° C. for the spindle method. On the other hand, in the case of the friction method, the range is preferably about 170 to 200° C. for the contact heater and about 200 to 300° C. for the point contact heater. If the heater temperature is below the above range, it may be difficult to impart sufficient crimps in any method. As a result, the fibers may not be sufficiently opened, and it may become difficult to mix and entangle the fibers later.

The twisting/untwisting mechanism is slightly different between the spindle method and the friction method. In the spindle method, a pin-type false twister is rotated by the rotation of the spindle to twist the yarn. The degree of twisting at this time, that is, the false twist coefficient is preferably 20,000 to 34,000, more preferably 22,000 to 30,000.

The false twist coefficient is calculated by the formula K=T×D ^1/2 . In the formula, K is the false twist coefficient, T is the number of false twists (T/M), and D is the total fineness (dtex) of the composite false twisted yarn.

The number of false twists is calculated by T=spindle rotation speed (rpm)/surface speed of the second take-up roller 7 (m/min). When the false twist coefficient is 20,000 or more, the crimp is further developed, and the crimped polyester false twisted crimped yarn B can be sufficiently crimped, so that the bulkiness is excellent. On the other hand, when the false twist coefficient is 34,000 or less, yarn breakage and fluff can be further suppressed.

In the friction method, the degree of twisting is generally controlled not by the false twist coefficient, but by the K value and the number of discs. This is due to the difference in the twisting/untwisting mechanism of both types. The K value is the ratio (T2/T1) between the untwisting tension (T2) and the twisting tension (T1), where T2 is the yarn tension immediately after passing through the disc and T1 is the yarn tension introduced into the disc. It means the yarn tension just before.

In the friction method, twisting occurs due to the rotation of the disc. Therefore, the degree of twisting is determined by the disc speed and the number of discs. However, direct management of the disk speed is not very efficient in terms of process control, so in view of the fact that the K value fluctuates due to fluctuations in the disk speed, it is generally more efficient to manage the K value. It is said that there is

In the friction method, the disk is generally made of polyurethane, although it is not particularly limited. The number of discs is generally preferably 5 to 7, and the thickness of the disc is preferably 5 to 10 mm. Also, the K value is preferably 0.6 to 1.2. When the K value is 0.6 or more, yarn breakage and fluff can be further suppressed. On the other hand, when it is 1.2 or less, surging hardly occurs. Note that surging refers to a state in which twisted twists are not untwisted in the untwisting area and the twist remains.

Either step (b) or step (c) may be performed first.

Step (d) will be described below. That is, the polyester multifilament A and the polyester false-twisted crimped yarn B are combined by fluid jet processing to form a polyester mixed filament yarn. By subjecting the yarn to fluid jet processing, it is possible to impart morphological stability and entanglement to develop a heathered tone, thereby obtaining the desired polyester mixed yarn.

For fluid jet machining, for example, a fluid jet nozzle can be used. Fluid injection nozzles include an interlaced type, a taslan type, and the like.

As conditions for fluid jet machining, the overfeed rate of the interlace zone: 1 to 5.0%, and the air pressure supplied to the fluid jetting device is adjusted within the range of 0.1 to 0.5 MPa to reduce the number of entanglements. A range of 20 to 100/m is preferable.

The method for producing the polyester mixed yarn of the present invention will be described with reference to the drawings.
FIG. 2 is a schematic process diagram showing one embodiment of the method for producing the polyester mixed yarn of the present invention.

As shown in FIG. 2, the packages YA and YB of the polyester highly oriented undrawn yarns A and B are set on creels, respectively. Next, the polyester highly oriented undrawn yarn A is introduced to the first supply roller 1 . Then, a drawing step of drawing the polyester highly oriented undrawn yarn A is performed between the first supply roller 1 and the first take-up roller 7 .

Next, a false twisting step (step (c)) is performed in which the polyester highly oriented undrawn yarn B is false twisted under predetermined conditions. Specifically, as shown in FIG. 2, the polyester highly oriented undrawn yarn B is introduced to the second supply roller 2 and then introduced to the third supply roller 3, and the heater 4, the cooling plate 5, and the false twisting tool 6 are applied. Then, the polyester false twisted yarn B is obtained by pulling it out from the first take-up roller 7 . The area between the third supply roller 3 and the false twister 6 is the twisting zone T1, and the area between the false twister 6 and the first take-up roller 7 is the untwisting zone T2. Generally, as the false twister 6, a pin type is used in the case of the spindle method, and a disk type is used in the case of the friction method. The twisting/untwisting mechanism is slightly different between the spindle method and the friction method. In the spindle method, the rotation of the spindle causes the pin-type false twister 6 to rotate, and the yarn is twisted.

In the false twisting step, it is preferable to specify the processing speed and draw ratio respectively. The processing speed refers to the yarn speed when the yarn is pulled out from the first take-up roller 7 , that is, the surface speed of the first take-up roller 7 .

After the false twisting step, the polyester false twisted crimped yarn B is guided to the fluid nozzle 8 together with the polyester multifilament A, and the polyester multifilament A and the polyester false twisted crimped yarn B are aligned using the fluid nozzle 8. The mixed fibers are entangled to form a polyester mixed fiber yarn.

Fluid nozzles are not particularly limited, but generally Taslan nozzles or interlaced nozzles are suitable. In the case of FIG. 2, the overfeed rate of the interlaced zone is determined by the following equation.
Overfeed rate=(Surface speed of first take-up roller 7−Surface speed of second take-up roller 9)/Surface speed of third take-up roller 9×100 (%)

After passing through the second take-up roller 9 , the mixed polyester yarn is taken up by the take-up roller 10 onto the package 11 .

The polyester mixed yarn of the present invention is obtained by mixing and entangling the polyester multifilament A and the polyester false twisted crimped yarn B, each having a specific single filament cross-sectional shape, so that the filling rate of the constituent fibers is increased. In addition, the fabric obtained by weaving and knitting and dyeing the polyester mixed yarn of the present invention has an appropriate crispness and stiffness even if it is excellent in bulkiness, and furthermore, it has a cationic dye. Since no heat is used, it is possible to express a more natural and delicate heathered tone in which glare is suppressed.

The polyester mixed yarn of the present invention is suitably used in the field of clothing (for example, sportswear, general clothing such as ladies' clothing, etc.) where natural and delicate heathered tone, crispness, and stiffness are desired. It is preferably used for women's applications, and most preferably used for spring and summer clothing applications.

The present invention will be specifically described below in accordance with examples. The invention is not limited to this example. The measurement methods or evaluation methods in the examples of the present invention are as follows.

Fineness Measured according to JIS L1013 8.3.1 B method (convenient method).

Crimping rate Using a measuring machine with a frame circumference of 1.125 m, the sample was wound 5 times to remove the skein, and then the skein was hung on a stand in a free state at room temperature for a whole day and night. Next, while applying a load of 0.000147 cN/dtex to the skein, it was placed in boiling water and subjected to wet heat treatment for 30 minutes. Then, a load of 0.000147 cN/dtex and 0.00177 cN/dtex (light heavy load) are applied to the skein, and the length X is measured. Subsequently, while the load of 0.000147 cN/dtex was applied, a load of 0.044 cN/dtex (heavy load) was applied instead of the light heavy load, and the length Y was measured. After that, it was calculated based on the formula of crimp ratio (%)=(Y−X)/Y×100. The crimp ratio was measured for five samples, and the average of each sample was taken as the crimp ratio of the yarn.

Irregularity Using "BH2-UMF" manufactured by Olympus Corporation, the cross-sectional shape of the filament was observed (magnification: 230 times). Among the circles that can be drawn by contacting (circumscribing) points on the outside of the shape, the circle that can be drawn by contacting (circumscribing) the largest number of points on the outside of the shape, and the circle with the smallest diameter is the circumscribing circle. Among the circles that can be drawn by contacting (inscribed) at three points or more, the circle with the largest diameter was used as the inscribed circle. Then, the degree of irregularity was determined by the following formula. The average value of all constituent fibers was taken as the degree of irregularity.
(Irregularity) (%) = [(Rr) / R] × 100
R: Diameter of circumscribed circle in modified cross-sectional shape, r: Diameter of inscribed circle in modified cross-sectional shape

<Method for making tubular knitted fabric>
Using a tubular knitting machine manufactured by Eiko Sangyo Co., Ltd. (bottle diameter: 3.5 inches, number of needles: 260 N), a tubular knitting machine with a length of about 30 cm was produced. Then, scouring and dyeing were performed under the following conditions.

(Scouring conditions)
・ Scouring agent: Sunmol FL (manufactured by Nicca Chemical Co., Ltd.) 1 g / L
・Temperature x time: 80°C x 20 minutes

(Blue dyeing prescription)
・ Dye: Dianix Blue UN-SE (manufactured by DyStar) 1% omf
・Auxiliary agent: 0.2 cc/L of acetic acid
・Nikka Sun Salt SN-130 0.5g/L

(Other dyeing conditions)
・Bath ratio: 1:50
・Temperature x time: 130°C x 30 minutes

K / S value after tubular knitting dyeing The tubular knitted fabric obtained by tubular knitting, scouring and dyeing the polyester mixed yarn under the above conditions is folded so that light does not penetrate, manufactured by Macbeth The reflectance was measured using a spectrophotometer "MS-CE3100 type" of the CIE Lab, and the density index was obtained from the color difference formula of CIE Lab to obtain the K/S value.
ΔL* Value after Tubular Dyeing The polyester multifilament A after the step (b) and the polyester false twist crimped yarn B after the step (c) were each collected. Then, using only the polyester multifilament A, a tubular knitted fabric was obtained by tubular knitting, scouring and dyeing under the above conditions (tubular knitted fabric A). Using only the polyester crimped yarn B, a tubular knitted fabric was obtained by tubular knitting, scouring and dyeing under the above conditions (tubular knitted fabric B).
For each of the tubular knitted fabrics A and B, a spectrophotometer "MS-CE3100" manufactured by Macbeth was used to measure the reflectance, and the density index was obtained from the CIE Lab color difference formula, and the L* value was calculated for each. asked. For each, n=4, and the average value was adopted. The difference in the L* value between the tubular knitted fabric A and the tubular knitted fabric B was obtained and defined as the difference in the L* values (ΔL* value) between the polyester multifilament A and the polyester false twist crimped yarn B.

Sensory evaluation (strength and stiffness)
The tubular knitted fabric obtained as described above was judged based on the following criteria based on the tactile sensation.
◯: excellent in firmness and stiffness.
Δ: Feeling of firmness is normal.
x: Inferior in elasticity and stiffness.

Sensory evaluation (crisp feeling)
The tubular knitted fabric obtained as described above was judged based on the following criteria based on the tactile sensation.
◯: excellent crispness.
Δ: Normal sharpness.
x: No crispness is felt, or the crispness is too strong and the texture is poor.

Sensory evaluation (heather tone)
The tubular knitted fabric obtained as described above was visually observed and judged according to the following criteria.
◯: The heathered feeling is delicate and natural.
Δ: Heathered feeling is slightly delicate and natural.
x: The heathered feeling is intense and rough.

Sensory evaluation (glossiness)
The tubular knitted fabric obtained as described above was visually observed and judged according to the following criteria.
◯: Glare of the fabric is suppressed.
Δ: The fabric has some glare.
x: There is glare in the fabric.

(Example 1)
First, a highly oriented undrawn polyester yarn A and a highly oriented undrawn polyester yarn B were prepared as supply yarns. Polyethylene terephthalate ₍ PET) having an intrinsic viscosity of 0.65 and a glass transition point of 75° C. was chipped by a conventional method and dried. %.

Using the above PET containing titanium oxide fine particles, using a special nozzle whose single filament cross section has six protrusions, using a conventional spinning device, a multifilament at a spinning temperature of 295 ° C. spun out. Then, the spun multifilament is cooled, an oil agent is applied to its surface, and it is taken up by a take-up roller at a speed of 3,000 m / min. Polyester highly oriented undrawn yarn (121.4 dtex/24 filaments) (polyester highly oriented undrawn yarn A, polyester highly oriented undrawn yarn B), which is a cross section, was obtained.

Then, the polyester highly oriented undrawn yarn A and the polyester highly oriented undrawn yarn B were subjected to the manufacturing process of the polyester mixed yarn as shown in FIG. The processing conditions for the step (b) for polyester multifilament A, the step (c) for polyester false twisted crimped yarn B, and the step (d) for polyester mixed yarn are as follows. A polyester mixed yarn of 187.5 dtex/48 filaments was obtained. A friction method was used for the false twisting method of the step (c) in Example 1.

<Step (b): Stretching step>
Surface speed of first supply roller 1: 400 m/min Surface speed of first take-up roller 7: 500 m/min Stretch ratio of polyester highly oriented undrawn yarn A: 1.25 times

<Step (c): Simultaneous drawing and false twisting step>
Surface speed of second supply roller 2: 324.7 m/min Surface speed of second supply roller 3: 324.7 m/min Surface speed of first take-up roller 7: 500 m/min Draw ratio of polyester highly oriented undrawn yarn B : 1.54 times Temperature of heater 4: 300°C
Twisting/untwisting tension ratio (K value): 0.72
Twisting direction: Z direction Structure of false twister 6 (disk): 1-6-1
Thickness of false twisting tool 6 (disk): 9 mm

<Step (2): Fluid injection processing>
Surface speed of first take-up roller 7: 500 m/min Interlaced nozzle 8: P-212 manufactured by Heva Line
Air pressure of interlaced nozzle 8: 0.34 MPa
Surface speed of second take-up roller 9: 485.0 m/min Overfeed rate in interlace zone: 3.0%

The following conditions were applied to the take-up roller.
Surface speed of winding roller 10: 480.5 m/min Overfeed rate of winding zone: 3.9%

FIG. 3 shows a cross-sectional photograph of the polyester mixed yarn obtained under the above processing conditions. The average irregularity of the polyester multifilament A of Example 1 was 29%, and the average irregularity of the polyester false-twisted crimped yarn B was 44%.

(Example 2)
As the highly oriented polyester undrawn yarn in step (a), the same highly oriented undrawn polyester yarn as in Example 1 was prepared except that it was 84.3 dtex/24 filaments. This was processed in the same manner as in Example 1 under the conditions shown in Table 1 to obtain a polyester mixed yarn. This polyester mixed yarn was obtained and subjected to various evaluations. The average irregularity of the polyester multifilament A of Example 1 was 33%, and the average irregularity of the polyester false-twisted crimped yarn B was 50%. Compared with Example 1, the bulkiness was slightly poor, but it was sufficiently practical.

(Example 3)
Instead of the highly oriented polyester undrawn yarn in step (a), the same highly oriented undrawn polyester yarn as in Example 1 (125. 2 dtex/24 filament) was prepared and processed in the same manner as in Example 1 under the conditions shown in Table 1 to obtain a polyester mixed yarn. When this polyester mixed yarn was evaluated, compared to Example 1, it was slightly poor in crispness and elasticity, and had a heathered feeling with a slight glare, but it was sufficiently practical. rice field.

(Example 4)
In Example 1, the draw ratio for obtaining the polyester multifilament A in step (b) was set to 1.15, and the other steps were the same as in Example 1 to obtain polyester mixed yarn. Compared with Example 1, it was slightly irritating and slightly lacking in natural and delicate heathered tone. However, it was sufficient for practical use.

(Example 5)
In Example 1, the draw ratio for obtaining the polyester multifilament A in the step (b) was changed to 1.40, and the other steps were the same as in Example 1 to obtain a polyester mixed yarn.

(Comparative example 1)
In Example 1, the drawing temperature in obtaining the polyester multifilament A in the step (b) was set to 100° C., and the other steps were the same as in Example 1 to obtain a polyester mixed yarn. This polyester mixed yarn was evaluated. Compared with Example 1, the difference in gradation was remarkably small, and a heathered feeling could not be obtained.

(Comparative example 2)
In Example 1, a highly oriented polyester undrawn yarn (122.5 dtex/24 filaments) having a round cross section was prepared in place of the highly oriented undrawn polyester yarn having a modified cross section with six projections in step (a). Then, it was processed in the same manner as in Example 1 under the conditions shown in Table 1 to obtain a polyester mixed yarn. This polyester mixed yarn was tubularly knitted by a conventional method and dyed with a disperse dye, and the heathered feeling was compared with that of Example 1.

(Comparative Example 3)
In Example 1, the draw ratio for obtaining the polyester multifilament A in step (b) was set to 1.55, and the other steps were the same as in Example 1 to obtain polyester mixed yarn. This polyester mixed yarn was tubular knitted by a conventional method and dyed with a disperse dye, and the heathered feeling was compared with that of Example 1. As a result, the shade difference was remarkably small and the heathered feeling was not obtained.

(Comparative Example 4)
As the highly oriented undrawn polyester yarn in step (a), the same highly oriented undrawn polyester yarn as in Example 1 was prepared, except that the yarn had a small average irregularity of 12% and an average irregularity of 123.1 dtex/24 filaments. This was subjected to the same processing as in Example 1 to obtain a polyester mixed yarn. This polyester mixed yarn was obtained and subjected to various evaluations. The average irregularity of the polyester multifilament A of Example 1 was 19%, and the average irregularity of the polyester false-twisted crimped yarn B was 33%. When compared with Example 1, it lacked crispness and had a glaring heathered tone.

(Comparative Example 5)
Instead of the highly oriented polyester undrawn yarn in step (a), the same highly oriented undrawn polyester yarn as in Example 1 (123. 1 dtex/24 filaments) were prepared and processed in the same manner as in Example 1 under the conditions shown in Table 1 to obtain a polyester mixed yarn. When this polyester mixed yarn was subjected to evaluation, it was found that compared with Example 1, the crispness was too strong and the texture was inferior.

Tables 1 and 2 collectively show processing conditions, evaluation results, and the like in Examples and Comparative Examples.

YA Package of polyester highly oriented undrawn yarn A YB Package 1 of polyester highly oriented undrawn yarn B First take-up roller 2 Second take-up roller 3 Third supply roller 4 Heater 5 Cooling plate 6 False twister 7 First take-up roller 8 fluid nozzle 9 second take-up roller 10 take-up roller 11 package

Claims (7)

A polyester mixed yarn obtained by mixing and entangling a polyester multifilament A and a polyester false twisted crimped yarn B,
Both the polyester multifilament A and the polyester false-twisted crimped yarn B have a modified cross-sectional shape with 3 to 6 projections when the cross-sectional shape of the single yarn is cut perpendicular to the longitudinal direction of the fiber. and
The irregularity of the polyester multifilament A is lower than the irregularity of the polyester false twisted crimped yarn B, the irregularity of the polyester multifilament A is in the range of 20 to 60%, and the polyester false twisted crimped yarn The irregularity of B is in the range of 35 to 70% ,
The L* value of the polyester false twisted crimped yarn B is higher than the L* value of the polyester multifilament A, and the L* value of the polyester multifilament A and the polyester false twisted crimped yarn B A polyester mixed yarn characterized by a difference (ΔL* value) of 3.0 or more . 2. The polyester mixed yarn according to claim 1 , wherein both the polyester multifilament A and the polyester false-twisted crimped yarn B exhibit a modified cross-sectional shape having six protrusions. 3. The polyester mixed filament yarn according to claim 1 , wherein the mass ratio of the polyester multifilament A and the polyester false twisted crimped yarn B is 30/70 to 70/30. The polyester mixed filament yarn according to any one of claims 1 to 3 , wherein the crimp ratio of the polyester false twisted crimped yarn B is 30 to 70%. The polyester mixed yarn according to any one of claims 1 to 4 , characterized in that the number of entanglements is 20 to 120/m. A woven or knitted fabric comprising the polyester mixed yarn according to any one of claims 1 to 5 in an amount of 20% by mass or more of the total constituent fibers. A method for producing the polyester mixed yarn according to claim 1 , comprising the following steps (a) to (d).
(b) Highly oriented undrawn polyester having a cross-sectional shape obtained by cutting a single yarn perpendicularly to the longitudinal direction of the fiber exhibits a modified cross-sectional shape with 3 to 6 protrusions and an irregularity of 20 to 60%. The cross-sectional shape obtained by cutting the yarn A and the single yarn perpendicularly to the longitudinal direction of the fiber has an irregular cross-sectional shape with 3 to 6 protrusions, and the irregularity is 20 to 60%. A step of preparing a drawn yarn B (b) Cold drawing the polyester high-density undrawn yarn A at a temperature below the glass transition point and a draw ratio of 1.15 to 1.40 times to form a polyester multifilament A ( C) A step of drawing and false twisting the polyester highly oriented undrawn yarn B at a temperature of 200 to 300° C. and a false twist ratio of 1.40 to 1.80 to form a polyester false twisted crimped yarn B (d) the polyester mulch A step of combining the filament A and the polyester false-twisted crimped yarn B by fluid jet processing to form a polyester mixed yarn.

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