JPH0434008A - Production of combined filament yarn having multiple shrinkage difference - Google Patents

Abstract

PURPOSE:To obtain the subject combined yarn having characteristics of sufficiently and finely mixed combined filaments and various power of expression by mixing plural polymers at a nonuniform distribution of mixing ratios thereof in the cross-sectional direction of a spinneret in a polymer gathering part on the spinneret and then discharging the polymers. CONSTITUTION:For example, polyethylene terephthalate without any copolymerization components is used as a polymer (A) and a modified polyethylene terephthalate prepared by copolymerizing isophthalic acid and/or 2,2- bis[4-(2-hydroxyethoxy)phenyl]propane is used as a polymer (B). Both are respectively passed through a group of dispersion holes 5 arranged densely in the outer peripheral part and thinly in the central part of a dispersion plate and a group of dispersion holes 8 and communicating holes 7 arranged densely in the central part and thinly in the outer peripheral part of the dispersion plate, joined in a spacer 9 on a spinneret 6 and discharged from discharge holes 10-14 to afford the objective combined filament yarn having shrinkage factors in boiling water differing by >=3%.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for producing a multi-shrink differential blend yarn suitable for producing various types of high-quality clothing fabrics.

[Conventional technology]

In order to impart desirable textures such as fullness, drapability, soft surface touch, and firmness to clothing fabrics, this article describes a method of weaving and knitting by blending multiple yarns with different shrinkage characteristics. Many have been proposed. For example, JP-A-49-72449 and JP-A-83-42913 disclose techniques for producing mixed fiber yarns in which high-shrinkage yarns and low-shrinkage yarns are spun from the same spindle. Also, Unexamined Japanese Patent Publication No. 6
Publication No. 2-170517 and JP-A-68-126929
The publication discloses an example in which a plurality of yarns are given a difference in shrinkage rate and then combined to form a mixed yarn.

The above-mentioned conventional techniques can be classified into two types: spinning and blending, in which multiple polymers with different properties are discharged from the same nozzle using a composite spinning machine, and mixed in the spinning process; Alternatively, multifilaments whose properties have been changed by different spinning processes, drawing conditions, etc. are spun separately in advance, and the plurality of multifilaments are mixed in a later appropriate process. It can be broadly divided into methods.

In the former method, it is possible to obtain a mixed fiber yarn only through the spinning process, so productivity is high, and by devising the arrangement of the spindle holes, it is possible to obtain a mixed fiber yarn with a good texture in which the filaments are mixed in a preferable manner. I can do it.

However, on the other hand, even if one tries to obtain a blended yarn of three or more types, there are constraints due to poor spinnability and complicated equipment, and the method is essentially limited to a blend of two types of polymers. Ta.

Therefore, the multifilament mixed fiber yarn produced by this technique cannot meet the demands for a variety of textures that have become particularly demanding in recent years, and is not satisfactory for producing fabrics with a more luxurious feel.

In addition, the latter post-mixing method can mix filament yarns with various characteristics and has the characteristic of being highly expressive, but it is inferior in productivity and It has the disadvantage of poor playability, which is essential for fully demonstrating its characteristics, and great efforts are being made to improve it.

[Problem to be solved by the invention]

As mentioned above, blended yarns that have the characteristics of blending that can be obtained with the spinning and blending method, as well as the diverse expressiveness of the post-mixing method, have been considered as an important issue in the long-established industry. Despite continued efforts, he had not yet found any useful technology.

In order to solve these problems, the present inventors have made extensive studies and have finally arrived at the present invention.

[Means to solve the problem]

That is, an object of the present invention is to control the mixing ratio of the plurality of thermoplastic polymers (hereinafter referred to as polymers) at the polymer meeting area in the upper part of the spinneret when performing composite spinning of a plurality of thermoplastic polymers (hereinafter referred to as polymers) that have different shrinkage rates after fiber formation. This can be achieved by a method for producing a multi-shrinkage differentially mixed fiber yarn, which is characterized by mixing in a non-uniform distribution in the cross-sectional direction of a spinneret and then discharging it from the spinneret.

The present invention will be explained in detail below.

It is necessary that the plurality of polymers used in the present invention have different shrinkage rates after fiber formation.

Having different shrinkage rates means that the flood shrinkage rates are different when spinning and drawing are performed under the same conditions. More specifically, the spinning temperature is 290°C, the spinning temperature is 290°C, and the spinning speed is 1250 m/w.
The undrawn yarn obtained by winding at a speed of
By hot plate method, heating pin temperature is 95℃, hot plate temperature is 135℃
, stretching ratio 3.5 times.

It is sufficient that the flood shrinkage rates when stretched at a stretching speed of 350 m/win are different, preferably by 3% or more.

Combinations of polymers that meet the above conditions include combinations of polyesters, combinations of polyamides,
Alternatively, a combination of polyesters and polyamides is preferred.

Polymer combinations suitable for high-end clothing applications include combinations of polyethylene terephthalate and/or its copolymers, combinations of nylon 6, nylon 66 and/or its copolymers, and combinations of polyethylene terephthalate and/or its copolymers and nylon 6. A combination of nylon 66 and/or a copolymer thereof is more preferred.

Preferred copolymerization third components of polyethylene terephthalate used here include dicarboxylic acids such as oxalic acid, adipic acid, sebacic acid, azelaic acid, dimer acid, phthalic acid, and isophthalic acid, propylene glycol, butylene glycol, and neopentyl glycol. , spiroglycol, diethylene glycol, polyethylene glycol and other glycols, 2-2-bis (4-(2
-hydroxyethoxy)phenyl)propane, ethylene oxide adducts of bisphenols such as 2.2bis(4-(2-hydroxyethoxy)phenyl)sulfone, and oxycarboxylic acids such as hydroxybenzoic acid. Further, a metal sulfonate group such as 5-sodium sulfoisophthalate or the like may be introduced. Moreover, copolymerization of multiple types of components is also possible.

From the point of view of the balance between flood shrinkage rate and dry heat shrinkage rate, the combination of polymers is polyethylene terephthalate, which has substantially no copolymer components, isophthalic acid and/or 2φ2 bis(4-(2-hydroxyethoxy)). Most preferred is a combination of modified polyethylene terephthalate copolymerized with (phenyl)propane.

Further, additives such as a matting agent, an antioxidant, a fluorescent whitening agent, an ultraviolet absorber, an antistatic agent, and a twist retardant may be added to the extent that the object of the present invention is not impaired.

Next, the manufacturing method of the present invention will be specifically explained using the drawings.

Figure 1 shows one of the main parts of the spinning pack used in the present invention.
It is a sectional view showing an example. In Figure 1, the pack body 1
Among polymer A for low shrinkage and polymer B for high shrinkage, which are filtered and separated into two streams at the top of the
It passes through the polymer passing hole 3 drilled on the outermost periphery of the upper dispersion plate 2, and then passes through the dispersion hole 5 drilled in the lower dispersion plate 4, onto the spinneret 6 in which discharge holes 10 to 14 are bored. This leads to spacer 9. The dispersion holes 5 are arranged densely on the outer periphery of the lower dispersion plate and become sparsely arranged as they approach the center.

On the other hand, the polymer B passes through a dispersion hole 8 drilled in the upper dispersion plate 2 and a communication hole 7 that communicates with the dispersion hole 8 and is bored in the lower dispersion plate 4, and passes through a spacer 9 on the spinneret 6.
It comes to. At this time, the dispersion holes 8 of the upper dispersion plate 2 are arranged densely in the center of the upper dispersion plate and become sparse as they approach the outer periphery.

The total number of dispersion holes 5 and 8 is adjusted as appropriate depending on the number of discharge holes and the shrinkage characteristics or crimp characteristics of the mixed fiber yarn that are desired, but it should be at least twice the number of discharge holes. It is preferable that there be.

As described above, polymers A and B each have a separate distribution hole 5.
The polymer A passes through a group of dispersion holes 8 and a group of communication holes 7, and merges at a spacer 9 on the spinneret 6. The dispersion holes 5 through which polymer A passes are densely distributed around the outer periphery of the dispersion plate, and are concentrated in the center. On the other hand, the dispersion holes 8 and communication holes 7 through which polymer B passes are densely arranged in the center of the dispersion plate, and sparsely arranged as they approach the outer periphery. Regarding the mixing ratio of the mixed polymer streams that merge at the spacer 9 on the spinneret 6, the ratio of polymer B is approximately high in the center of the spinneret, and the ratio of polymer A increases as the area approaches the outer periphery.

Here, the mixing ratio refers to the weight ratio of each polymer per unit of mixed polymer flow.

Then, it reaches the spinneret 6 and is discharged from the discharge holes 10 to 14 while having a mixing ratio gradient in the cross-sectional direction.

As described above, in the present invention, it is necessary to mix the plurality of polymers so that the mixing ratio thereof becomes non-uniformly distributed in the cross-sectional direction of the spinneret.

The mixing may be in a state in which the boundary surfaces of the plurality of polymers are clear, or in a state in which the boundary surfaces are mutually dispersed in a so-called polymer blend.

Here, being non-uniform in the cross-sectional direction of the spinneret means that the mixing ratio of the polymer per unit weight of that portion differs with the distance from the center of the spinneret.

Note that this unit weight is more specifically defined as the weight of the polymer flowing in one second through the introduction portion of the upper part of the spinneret of the discharge hole formed in the spinneret.

If the mixing ratio of multiple polymers is uniform in the cross-sectional direction of the spinneret, the mixing ratio of the polymers discharged from each discharge hole will also be constant, and as will be described later, there will be no difference in shrinkage between filaments, and when it is made into a fabric. It does not exhibit a soft, full feeling.

When the spinning pack shown in FIG. 1 is used, the polymer discharged from the spinneret passes through the discharge holes 1
From the group of discharge holes 11, a mixed polymer with a high proportion of polymer A or substantially only polymer A is used, and from the group of discharge holes 11, polymer A is used.
The group of discharge holes 12 discharges a mixed polymer in which the ratio of polymer A and polymer B is approximately the same. Further, from the group of discharge holes 13, a mixed polymer with a slightly higher proportion of polymer B is mixed, and from the group of discharge holes 14 arranged at the innermost periphery, a mixed polymer with a higher proportion of polymer B or a substantially higher proportion of polymer B is mixed. Only polymer B is discharged.

Even in a group of discharge holes arranged concentrically, the polymer mixing ratio at the top of each discharge hole changes depending on the relative positional relationship between the distribution hole group, the communication hole group, and the discharge hole. Subtle differences occur in the mixing ratio of the polymers discharged from the discharge holes.

Therefore, a multi-shrink mixed fiber yarn is obtained in which the change in shrinkage rate between filaments is substantially continuous.

In addition, since the polymer discharged from each group of discharge holes 11 to 13 is a non-uniform mixture of polymer A and polymer B, these filaments have a latent crimp property and are soft. This is preferable because it can more effectively provide a feeling of fullness.

FIG. 1 shows an example in which groups of discharge holes are arranged in five concentric circles on a spinneret. The number of concentrically arranged discharge holes in the spinneret is adjusted appropriately depending on the number of filaments, but is preferably 3 or more rows, more preferably 5 rows or more.
It should be more than one column.

Furthermore, in order to make the change in shrinkage rate more continuous, it is also preferable to arrange the ejection holes not in a concentric circle but in a helical arrangement in which the distances from the center of the spinneret are all different, or in a random arrangement.

In Figure 1, the upper distribution plate and the lower distribution plate are
Although a mode of polymer dispersion is shown using stages of dispersion plates, it is also possible to use a single dispersion plate. That is, the dispersion plate is divided into sections on the upper surface of the dispersion plate to prevent the polymers from being mixed together, and a dispersion hole having a polymer outlet as seen on the lower surface of the lower dispersion plate in FIG. It is also possible to do this. Other mechanisms that can control the desired mixed distribution of different types of polymers at the polymer meeting area can be employed.

In the present invention, the objective can be achieved by unevenly distributing the mixing ratio of multiple polymers in the cross-sectional direction of the spinneret at the polymer meeting area in the upper part of the spinneret. In this method, a plurality of dispersion holes having a non-uniform and different hole density distribution in the cross-sectional direction of the spinneret are formed in a dispersion plate arranged above the polymer association. , is preferable because it can increase the stability of spinning.

In addition, it is preferable to use two types of polymers in terms of production efficiency, and one of the two types of polymers is placed in a dispersion plate with dispersion holes arranged sparsely in the center and densely arranged toward the outer periphery. The other polymer is introduced into a dispersion plate in which the dispersion holes are arranged sparsely on the outer periphery and densely as they approach the center, and the two types of polymers are introduced into the polymer meeting area at the upper part of the spinneret. The dipping method is more preferable because it can yield a blended yarn with good texture.

Thereafter, the discharged polymer is subjected to normal spinning operations such as cooling and oiling as a thread, and then wound up. Regarding the winding operation, the effects of the present invention will not be hindered even if the method of winding the yarn as an undrawn yarn, which is conventionally known, and then stretching it, or the high-speed spinning method.

Furthermore, if necessary, yarn processing such as false twisting and air entanglement may be performed.

In addition, in order to control the crimp state by appropriately changing the mixing state, in place of a spacer at the polymer meeting area,
A mixing member made of glass beads, a sand layer, a laminated filter, a porous metal, or the like may be provided, and the polymers may be kneaded as appropriate.

Although FIG. 1 shows an example of two types of polymers, it is also possible to mix three or more types of polymers by adding a dispersion plate with communicating holes.

FIG. 2 shows a model of the shape of the multi-shrink differentially mixed fiber yarn obtained by the above-mentioned manufacturing method of the present invention after heat treatment.

Further, in FIG. 3, the flood shrinkage percentages of each filament constituting the multi-shrinkage differentially mixed yarn obtained by the above-mentioned present invention were measured, and the results were plotted in descending order of the shrinkage percentages. The parameter N/F on the horizontal axis in Fig. 3 is the flood shrinkage rate of the filaments constituting the mixed yarn, and when the integer N is given in descending order of the shrinkage rate, N is the value of the filament of the mixed yarn. This is the value divided by the number F.

〔Example〕

The present invention will be explained in more detail with reference to Examples below. Prior to the explanation, a method for measuring characteristics used in the present invention will be described.

A. One skein was made of 10 turns with a flood shrinkage rate of 11. The original length was measured under a load of 0.1 g/d, and the skein was treated in water at 98°C for 15 minutes under a load of 0.2 mg/d. After that, air dry for 24 hours and return to 0.
Measure the length after treatment under a load of 1 g/d. Here, calculate the flood contraction rate using the following formula.

Flood shrinkage rate (%) = B, flood shrinkage rate of filament After sampling a 10 cm or more arbitrary location of the mixed yarn, the fibers are divided into each filament. o, apply a load of 1 g/d, and mark the point where the filament length is exactly 10 cm.

Fix both ends and apply as little external force as possible, and immerse it in water at 98°C for 15 minutes in a free state. At this time, the filament is made slack from the beginning so that no tension is applied to the filament even if it shrinks during processing.

After air drying, the length of the treated filament is measured by applying a load of 0.1 g/d. Here, the flood shrinkage rate of the filament is determined using the following formula.

Flood shrinkage rate (%) = C1 Texture evaluation This is the basic texture that is important for high-end clothing fabrics [sensory evaluation was conducted by 10 experienced engineers for three types: fullness, "soft feeling", and "firmness". For each, existing fabrics using differential shrinkage blended yarns were used as the standard (5 points) and evaluated on a scale of 10. The obtained scores are averaged and the overall evaluation is made: 0 points or more and less than 2 points is "extremely poor" 2 points or more and less than 4 points is "poor" 4 points or more and less than 6 points is "average" 6 points or more and 8 points The scores were divided into five levels: "Excellent" for scores below 8 points and "Excellent" for scores ranging from 8 to 10 points.

Example 1 Polyethylene terephthalate with an intrinsic viscosity [η] of 0.66 in orthochlorophenol at 25°C was used as Polymer A, and 12.9 mol% of isophthalic acid was used as Polymer B.
Intrinsic viscosity [η1
0.67 of modified polyethylene terephthalate was introduced into the spinning pack shown in FIG.
(However, the total number of holes for both groups was 180 holes.

) to make the mixing ratio non-uniform in the cross-sectional direction, and then
It was discharged from a spinneret.

Subsequently, the undrawn yarn obtained by winding at a speed of 1250 m/m1n was heated to a hot pin temperature of 95% using the usual hot pin-hot plate method.
°C, hot plate temperature 135 °C, stretching ratio 3.5 times, stretching speed 3
A multifilament mixed yarn of 60 denier and 36 filaments was obtained by drawing at 50 m/sin.

The water conduction shrinkage rate of each filament constituting the mixed fiber yarn was continuous as shown in FIG. This yarn was twisted, used as warp and weft for weaving, relaxed scouring at 98°C, and finished and set at 170°C to form habutae. The fabric thus obtained had a fluffy feel and elasticity, and had a soft texture without a core, giving it an unprecedented sense of luxury. The result of the texture evaluation was "excellent."

Example 2 A mixed fiber yarn obtained by the same operation as in Example 1 except that 50 g of 30 meshes of morundum sand was filled in the polymer meeting area on the spinneret had a random crimp form between each filament. It had an excellent natural surface texture.

The result of the texture evaluation was "excellent."

Example 3 The discharge hole arrangement of the spinneret was arranged in three layers, and polymers A and B
A mixed yarn was obtained in the same manner as in Example 1, except that a weight ratio of 80:70 was introduced into the spinning pack, and the hot plate temperature during stretching was 40° C. higher than in Example 1. When the same evaluation as in Example 1 was carried out, it was found that the fabric had a well-balanced feeling of fullness, softness, and firmness, and had a satisfactory texture. The result of the texture evaluation was "excellent."

Example 4 A blended yarn obtained under the same conditions as Example 3 except that the discharge hole arrangement of the spinneret was changed to a double arrangement was evaluated in the same manner as in Example 1. It was an excellent fabric.

The result of the texture evaluation was "excellent".

Comparative Example 1 Only Polymer A was used in a normal spinning operation to produce 1250a+/
After winding up the film at a speed of min., it was stretched in the same manner as in Example 1 using a hot pin-hot plate method.

However, the heat set temperature of the hot plate at this time is 160
C, 130°C, and 110°C, three types of multifilaments (25 denier 12 filaments each) with water conduction shrinkage rates of 7%, 13%, and 19% were obtained.

These multifilament yarns were combined to form a mixed yarn.

The water conduction shrinkage rate of each filament constituting the mixed fiber yarn is the fourth
As shown in the figure, it was step-shaped.

When this mixed fiber yarn was woven and evaluated in the same manner as in Example 1, it was found that compared to Example 1, the mixed fiber yarn had poor elasticity and was inferior in fluffiness and softness. The result of texture evaluation was "inferior".

Comparative Example 2 A mixed yarn consisting of polymers A and B was obtained by spinning and drawing under the same conditions as in Example 1, except that polymers A and B were separately spun and mixed from the same spinneret. Ta.

The shape of the obtained mixed fiber yarn after heat treatment is shown in FIG. 5 as a model. The water conduction shrinkage rate of the filaments constituting the mixed fiber yarn was step-like as shown in FIG. When the same evaluation as in Example 1 was carried out, there was a core.
It had a poor soft feel. The result of texture evaluation is “
It was "inferior."

〔Effect of the invention〕

According to the manufacturing method of the present invention, a multi-shrinkage mixed fiber yarn is produced in which the shrinkage rate of the filaments is not step-like as in conventional differential shrinkage mixed fiber yarns, but has a continuous shrinkage rate change. As a result, it is possible to obtain a fabric that has no core, is soft and fluffy, and has a firm and luxurious feel that could not be obtained using conventional techniques.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an example of the essential parts of the spinning pack used in the present invention, and FIG. 2 is the shape of the multi-shrinkage mixed fiber yarn obtained by an example of the manufacturing method of the present invention after heat treatment. Fig. 3 is a graph plotting the flood shrinkage percentages of each filament of a multi-shrinkage differentially mixed yarn obtained by one example of the manufacturing method of the present invention in descending order of the shrinkage percentages. be. Figure 4 is a graph (comparative example 1) in which the flood shrinkage rates of each filament of the differential shrinkage mixed fiber yarn obtained by the conventional post-compounding method are arranged in descending order of shrinkage rate and plotted. A sketch diagram showing a model example of the form of a conventional differential shrinkage blended yarn after heat treatment (Comparative Example 2), Figure 6 shows the flood shrinkage rate of each filament of the conventional differential shrinkage blended yarn, and its shrinkage rate. This is a graph (Comparative Example 2) in which the values are plotted in descending order. 1: Pack body 2: Upper dispersion plate 3: Polymer passage hole 4: Lower dispersion plate 5: Dispersion hole in lower dispersion plate 6: Spinneret 7: Communication hole 8: Dispersion hole in upper dispersion plate 9 Varnish spacer - 10 to 14: Discharge hole

Claims (4)

[Claims] (1) After fiber formation, when composite spinning a plurality of thermoplastic polymers with different shrinkage rates, the mixing ratio of the plurality of polymers is non-uniform in the cross-sectional direction of the spinneret in the polymer association area at the upper part of the spinneret. A method for producing a multi-shrinkage differentially mixed fiber yarn, which comprises mixing the yarns in a uniform distribution and then discharging them from a spinneret. (2) Each of a plurality of thermoplastic polymers having different shrinkage rates is placed in a spinneret, which has a non-uniform and different perforation density distribution in the cross-sectional direction of a spinneret, which is perforated in a dispersion plate placed above the polymer association part. Claim (1) characterized in that the group of dispersion holes leads to the polymer association area in the upper part of the spinneret.
The method for producing the multi-shrinkage mixed fiber yarn described above. (3) One of the two types of thermoplastic polymers with different shrinkage rates is introduced into a dispersion plate with dispersion pores arranged sparsely in the center and densely towards the outer periphery, and the other is dispersed. The two types of polymers are introduced into a dispersion plate in which the holes are arranged sparsely on the outer periphery and densely as they approach the center, and the two types of polymers are guided to the polymer association area at the upper part of the spinneret. The method for producing a multi-shrinkage mixed fiber yarn according to claim (1) or (2). (4) One of the two types of thermoplastic polymers having different shrinkage rates is arranged so that the dispersion pores are sparse on an arbitrary end side A, and the arbitrary end side A and the center of the plate are the center of point symmetry. The dispersion plate is arranged so that it becomes denser as it approaches the opposite end side B, and the other side is placed in the opposite end side B.
The two types of polymers are introduced into a dispersion plate that is arranged sparsely and densely as it approaches an arbitrary end side part A, and the two types of polymers are introduced to a polymer association area at the upper part of the spinneret. The method for producing a multi-shrinkage mixed fiber yarn according to claim (1) or (2).