JP3357784B2 - Cotton-like composite processed yarn and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cotton-like composite textured yarn having a feeling and appearance similar to that of cotton, having good resilience and improved lightness, and a method for producing the same.

[0002]

2. Description of the Related Art Heretofore, as a method of obtaining a synthetic fiber processed yarn having a cotton-like feel and appearance, for example, a method of false-twisting a hollow polyester multifilament yarn and flattening the cross section (Japanese Patent Laid-Open No. 50-1979) No. 36750, JP-A-54-115650, etc.) have been adopted.

[0003] However, in the above-mentioned method, since all the filaments constituting the yarn are flattened and densely bundled, there is a problem that the repellency is inferior and that a lightweight feeling like cotton cannot be imparted.

[0004] That is, since the cotton fiber has a flat cross section, each single fiber has a twist, and each single fiber is provided with a sufficient inter-fiber space without being bundled. It shows resilience and lightness.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art, and to provide a cotton having a feeling and appearance similar to that of cotton, having a good repulsion and an improved lightness. It is an object of the present invention to provide a tone composite processed yarn and a method for producing the same.

[0006]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies in order to achieve the above object, and as a result, have found that a hollow filament whose cross section has been flattened by false twisting has a hollow filament whose cross section is not flattened. It has been clarified that a desired composite textured yarn can be obtained when the filaments are mixed and voids are provided between the flat hollow filaments.

Thus, according to the present invention, there is provided a composite processed yarn in which a flat hollow polyester filament (A) having a crimp and a non-crimp hollow polyester filament (B) are mixed, and The cotton-like composite processing wherein the filament (A) simultaneously satisfies the following requirements (a) and (b), and the non-crimped hollow polyester filament (B) satisfies the following requirement (c): A thread is provided. (A) Flatness in filament cross section is 2 or more (b) Filament crimp rate is 15% or less (c) Filament hollow rate is 10% or more

According to the present invention, there is provided a cotton fabric characterized in that undrawn polyester filaments having a hollow ratio of 20% or more are simultaneously drawn and twisted, and then mixed with polyester filaments having a hollow ratio of 10% or more. A method for producing a tone composite textured yarn is provided.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.

[0010] The cotton-like composite textured yarn of the present invention contains a flat hollow polyester filament (A) having a crimp as a constituent component thereof.

The filament (A) needs to have a flatness of 2 or more in the cross section of the filament and a crimp ratio of 15% or less.

Here, the flatness in the cross section of the filament refers to the ratio between the longest axis diameter in the cross section and the short axis diameter in a direction orthogonal to the cross section. Not only does it have an unattractive appearance, but also has an artificial glare.

However, if the flatness is too large, the handleability of the filament is deteriorated.

Further, the crimp ratio of the filament (A) needs to be 15% or less. The crimp rate is 15%
If it exceeds, the texture becomes rough and the object of the present invention cannot be achieved.

However, if the value of the crimping ratio is too small, the single fibers are likely to be bundled together, and the texture of cotton may be impaired. Therefore, it is preferable that the ratio is at least 2% or more.

The filament (A) is, for example, an undrawn polyester filament having a hollow ratio of 20% or more,
It is obtained by flattening by simultaneous stretching false twisting.

At this time, if the hollow ratio of the undrawn polyester filament is less than 20%, the filament is hardly crushed by false twisting, and it is difficult to make the flatness of the filament after false twisting to 2 or more. However, if the hollow ratio is too large, problems such as deterioration of the physical properties of the filament occur. Therefore, it is preferable to limit the hollow ratio to at most 70%.

Further, when the hollow polyester filament is a drawn yarn, the orientation of the filament is high and the filament is hardly crushed, so that it is also difficult to make the flatness of the filament after false twisting to 2 or more. .

In this case, if the false twisting temperature is increased or the number of false twists is increased, the filament is liable to be crushed.
It is not preferable because it becomes difficult to control the crimp ratio to 15% or less.

In the above-mentioned simultaneous drawing false twisting, it is preferable to adopt a condition such that the filament shrinkage rate after the false twisting becomes 10% or more.

When the shrinkage is less than 10%, for example, when the composite processed yarn is made into a woven or knitted fabric and shrunk by heating, the flat filaments are hardly twisted due to shrinkage, and the cottony feeling may be impaired.

However, if the value of the shrinkage is too large, the feeling may be hardened. Therefore, it is preferable to limit the value to at most 30%.

Next, the flat polyester filament is mixed with a polyester filament having substantially no crimp and having a hollow ratio of 10% or more.

At the time of mixing, conventionally known methods such as drawing, twisting, and air entanglement can be arbitrarily adopted.

When the flat polyester filaments and the hollow polyester filaments are not mixed and only the flat hollow polyester filaments are used, the filaments are tightly bundled, so that the resilience is reduced and a light feeling like cotton is imparted. Can not do.

Even if the flat polyester filaments and the hollow polyester filaments are mixed, if the hollow ratio of the hollow polyester filaments is less than 10%, it is impossible to give a light feeling like cotton.

However, if the hollow ratio of the hollow polyester filament is too large, the filament is liable to be crushed. Therefore, it is preferable to limit the hollow polyester filament to at most 50%.

Here, it is necessary that the hollow polyester filament has substantially no crimp.

When the hollow polyester filament has a crimp,
The twist structure due to shrinkage is hardly developed, and the feeling of cotton tone is impaired.

The mixing ratio of the hollow polyester filament is 20 to 7 with respect to the total weight of the composite processed yarn.
It is preferably 0%.

The cross-sectional shape and hollow shape of the hollow polyester filament are not particularly limited, and any shape can be adopted.

Hereinafter, the method for producing a composite yarn according to the present invention will be described in more detail.

FIG. 1 shows an example of a manufacturing apparatus for manufacturing a composite textured yarn of the present invention.

In FIG. 1, undrawn polyester filaments 1 and 2 having a hollow ratio of 20% or more are supplied to a heating roller 4 via a pretensioning roller 3, and are wound around the heating roller a plurality of times via a separate roller. After being turned, the filament 1 is simultaneously drawn and twisted with the drawing roller 7 using the false twisting tool 5, while the filament 2 is drawn with the drawing roller 6 using the drawing pin 6. .

Next, the filament 1 flattened by false twisting and the drawn hollow filament 2 are drawn together on a drawing roller 7 and then entangled by an air entanglement nozzle 8 to form a spindle type winding device 9. Is wound up by the pan 11.

At this time, the filament 1 and the filament 2
The air entanglement may be performed by passing a filament through an air entangled nozzle while overfeeding the filament between the supply roller and the take-up roller.
As shown in the above, if the stretching roller is a stepped roller having a different diameter in the roller axis direction and air entangled while overfeeding the filament by the surface speed difference between the large roller diameter portion and the small roller diameter portion, The number of rollers used can be reduced.

The heating roller temperature, stretching ratio, false twist number, etc. are determined so that the desired flat hollow polyester filament (A) and hollow filament (B) can be obtained.
The temperature may be appropriately set, but is preferably equal to or higher than the glass transition temperature of the synthetic fiber yarn used.

The number of windings on the heating roller may be appropriately set according to the desired amount of heat. However, in order to prevent the yarn from slipping, it is preferable to wind four or more windings.

As the false twisting device, any conventionally known ones such as a pin type and a triaxial friction type disk type can be arbitrarily employed, but a triaxial friction type disk type false twisting device capable of increasing the false twisting speed may be used. preferable.

Further, in order to prevent the recoil of the twist on the surface of the heating roller, and to further secure the fixing of the drawing point and the starting point of the twisting, the heating roller is provided with a thread retainer indicated by 10. Preferably, a roller is provided.

The thread press roller is disclosed in JP-B-52-38.
As disclosed in Japanese Patent Publication No. 138, at least the last one of the yarns wound on the heating roller is held on the heating roller, and at least the first winding is not held. Preferably, it is maintained.

On the other hand, in the above method, when the amount of heat for heating by the heating roller is insufficient, a plurality of heating rollers may be used. Any method such as a method of providing an apparatus can be adopted.

As shown in FIG. 2, the composite processed yarn thus obtained is obtained by mixing a flat hollow polyester filament (A) having a crimp and a non-crimp hollow polyester filament (B). In cross section, FIG.
As shown in the figure, the filament (A) has a flat shape and the filament (B) has a hollow shape.

[0044]

The composite textured yarn of the present invention contains flat hollow polyester filaments having crimps, so that it not only has a feeling and appearance like cotton but also has non-crimped hollow polyester filaments mixed. As a result, the hollow hollow polyester filaments have good repulsion and a light weight feeling without being converged.

[0045]

The present invention will be described in more detail with reference to the following examples. In addition, each physical property in an Example is measured by the following method.

(1) Flatness Based on the method described in Japanese Patent Application Laid-Open No. 54-151650, the ratio (a / b) of the longest axis diameter a and the short axis diameter b of the filament cross section was expressed.

[0047] (2) make a 3000 denier skein with crimp rate and shrinkage test scale machine reads skein length L ₀ when hanging heavy load of light load and 600g of 6 g.

The heavy load is removed, the crimp is developed by immersion in warm water of 98 to 100 ° C. for 20 minutes, and then naturally dried for 24 hours. The skein length L ₁ when the heavy load is suspended again is read.

Remove the heavy load and read the skein length L ₂ one minute later.

The crimp rate and shrink rate were calculated by the following equations.

[0051]

## EQU1 ## Crimp rate (%) = (L ₁ −L ₂ ) / L ₀

[0052]

## EQU2 ## Shrinkage (%) = (L ₀ −L ₁ ) / L ₀

Example 1 Polyester terephthalate having an intrinsic viscosity of 0.66 was spun at a spinning speed of 900 m / min.
(Denier / 36 filaments) are supplied to the composite textured yarn manufacturing apparatus shown in FIG. 1, one is simultaneously drawn and false-twisted under the conditions shown in Table 1, and the other is drawn, and then mixed by air entanglement. Delicate.

A triaxial friction type disk type false twist device was used as the false twist device, and the peripheral speed of the disk was 1200 m / min.

A vertical spindle type winding device was used as the winding device, and the spindle rotation speed was set to 7000 times / minute.

As shown in FIG. 3, the cross section of the composite yarn obtained was a mixture of flat filaments and hollow filaments.

When only the flat filaments were taken out from the composite processed yarn and their physical properties were measured, the crimp ratio was 4%.
%, The shrinkage was 15%, and the flatness was 3.8. Also,
The hollow rate of the hollow filament was 31%.

Next, 600 T /
After giving an S twist of m, a 2/2 twill woven fabric was woven using the warp and the weft, and dyed and finished in a conventional manner.

The obtained woven fabric was lightweight, had a feeling and appearance like cotton, and was refreshing and excellent in repulsion.

[Comparative Example 1] Two unstretched polyester yarns used in Example 1 were aligned and subjected to simultaneous drawing false twist under the same conditions as in Example 1 to obtain a crimp rate of 4%, a shrinkage rate of 15%, A false twist crimped yarn having a flatness of 3.7 was obtained.

The obtained false-twisted crimped yarn was woven and dyed in the same manner as in Example 1. The resulting woven fabric had a cotton-like feel and appearance, but was light-weighted. But poor resilience.

[0062]

According to the present invention, it is possible to provide a cotton-like composite processed yarn having a feeling and appearance similar to that of cotton, having a good rebound and an improved lightness, and a method for producing the same.

[Brief description of the drawings]

FIG. 1 is a front view showing an example of a composite processed yarn manufacturing apparatus according to the present invention.

FIG. 2 is a side view showing an example of the cotton-like composite textured yarn of the present invention.

FIG. 3 is a cross-sectional view showing an example of the cotton-like composite processed yarn of the present invention.

[Explanation of symbols]

 1, 2 Unstretched hollow polyester filament 3 Pretension roller 4 Heating roller 5 Triaxial friction type disk false twist device 6 Stretching pin 7 Stepped stretching roller 8 Air entanglement nozzle 9 Spindle type winding device 10 Yarn holding roller 11 Pan

Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI D02G 1/04 D02G 1/04 3/22 3/22 (56) References JP-A-63-50544 (JP, A) (58) Investigation Field (Int.Cl. ⁷ , DB name) D02G 3/04 D01D 5/22 D01D 5/24 D01D 5/253 D01F 1/08 D02G 1/04 D02G 3/22

Claims (2)

(57) [Claims] 1. A composite yarn obtained by mixing a crimped flat hollow polyester filament (A) and a non-crimped hollow polyester filament (B), wherein the flat hollow polyester filament (A) is The following (a)-
A cotton-like composite textured yarn which simultaneously satisfies the requirement (b) and wherein the non-crimped hollow polyester filament (B) satisfies the requirement (c) below. (A) Flatness in filament cross section is 2 or more (b) Filament crimp rate is 15% or less (c) Filament hollow rate is 10% or more 2. A process for producing a cotton-like composite processed yarn, comprising simultaneously drawing and twisting a polyester filament having a hollow ratio of 20% or more, and then blending with a polyester filament having a hollow ratio of 10% or more.