JP3359579B2 - Cellulose acetate filament composite fiber 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 cellulose acetate filament composite fiber yarn using an ultrafine cellulose acetate filament yarn and a method for producing the same.

[0002]

2. Description of the Related Art Cellulose acetate filament yarn has characteristics such as elegant luster, deep color tone, and moderate hygroscopicity. It is positioned as. However, in recent years, with the diversification and sophistication of consumer needs, it has been demanded that cellulose acetate filament yarns also have a texture such as a soft feeling, a wet feeling, a hand-held feeling, and a fluffy feeling.

As such a means for imparting a texture, there is also a means for changing the shape of the fiber cross section and the state of the fiber surface. However, since the effect is insufficient, it has been attempted to impart the texture by means of ultra-fine fibers. It has been done. However, with the conventionally proposed ultrafine cellulose acetate filament yarn, the texture of the woven or knitted fabric is soft, wet, but lacks hand-holding feeling and swelling feeling.
There was a drawback that the paper-like material was likely to be produced.

[0004]

The object of the present invention is to provide a soft, wet, hand-held, and swelling feeling by using a specific ultra-fine cellulose acetate filament yarn and, if combined with other types of filament yarns. It is based on finding what can be done. It is an object of the present invention to provide a soft, wet, hand-held, swelling feeling when formed into a woven or knitted fabric, and to provide an ultrafine cellulose acetate filament yarn capable of being compounded with another filament yarn, and a cellulose acetate filament composite with another filament yarn. To provide a mixed fiber.

[0005]

According to the present invention, an ultrafine cellulose acetate filament yarn having an average single fiber fineness of not less than 0.6 dtex and less than 1.1 dtex and another filament yarn, and the composite ratio of the cellulose acetate filament yarn is 50%. To 90%, the number of entanglements is 100 / m or more; a cellulose acetate filament composite mixed yarn, and an ultrafine cellulose acetate filament yarn having an average single fiber fineness of 0.6 dtex or more and less than 1.1 dtex, 10 to 2 solvents capable of dissolving cellulose acetate in the cellulose acetate filament yarn.
0% by weight, with a composite ratio of 50 to 90%, mixed with other filament yarns at an air pressure of 0.2 to 0.3 MPa to give a entanglement of 100 yarns / m or more. And a method for producing a cellulose acetate filament composite mixed yarn.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The ultrafine cellulose acetate filament yarn of the present invention has an acetylation degree of 48.8 to 62.5%,
It is preferably composed of 56.2 to 62.5% cellulose acetate, and has an average single fiber fineness of at least 0.6 dtex and less than 1.1 dtex, preferably 0.7 to 1.0 dte.
It is preferably x. Average single fiber fineness is 0.6 dt
If it is less than ex, when it is made into a woven or knitted fabric, the soft feeling and wet feeling become rich, but it tends to lack the feeling of swelling and hand-holding, and if it is 1.1 dtex or more, it lacks the soft feeling and wet feeling. Become.

[0007] The ultrafine cellulose acetate filament yarn of the present invention is prepared by dissolving cellulose acetate flakes having a degree of acetylation of 48.8% or more in a solvent such as acetone or a methylene chloride / methanol mixture to a concentration of 15 to 30% by weight.
From the spinneret having a spinning pore of 30 to
It can be obtained by a dry spinning method in which the fiber is spun into heated air at 85 ° C and wound up at a take-up speed of 250 to 550 m / min.

[0008] The cellulose acetate filament composite mixed yarn of the present invention has an average single fiber fineness of 0.6 dte.
This is a composite mixed yarn in which the ultrafine cellulose acetate filament yarn having a size of x or more and less than 1.1 dtex is entangled with another filament yarn and mixed. In the cellulose acetate filament composite yarn of the present invention, the composite ratio of the ultrafine cellulose acetate filament yarn needs to be 50 to 90%, preferably 60 to 80%. If the composite ratio of the ultrafine cellulose acetate filament yarn is less than 50%, when the woven or knitted fabric is used,
The texture-imparting effect of the ultrafine cellulose acetate filament yarn of the present invention is not exhibited, and if it exceeds 90%, the feeling of swelling is lost depending on the structure, and the paper-like material is easily obtained.

Other filament yarns mixed with the ultrafine cellulose acetate filament yarn include polyester filament yarn and rayon filament yarn, and more preferably, polyester filament yarn is used. When blended with polyester filament yarn, when it is made into a woven or knitted fabric, the surface is covered with ultrafine cellulose acetate filament in the dyeing and finishing process due to the difference in heat shrinkage between the ultrafine cellulose acetate filament and the polyester filament. The knitted fabric itself has a firm and rich hand feeling due to the contraction of the polyester filament.

Examples of the polyester filament yarn include a filament yarn made of polyethylene terephthalate or a polyester mainly composed of ethylene terephthalate units. The polyester filament yarn may be one having ordinary heat shrinkability, and especially a further heat-shrinkable polyester filament yarn. What added shrinkage may be sufficient.

[0011] The cellulose acetate filament composite fiber yarn of the present invention must be woven with a number of entanglements of at least 80 / m, preferably at least 100 / m.
By being mixed to such an entangled number, the cellulose acetate filament composite mixed yarn of the present invention, although it is originally two kinds of filaments having different dyeing behavior, shows apparent levelness with a disperse dye, and Shows good handling properties as yarn.

[0012] The cellulose acetate filament composite yarn of the present invention can be produced as follows. That is, the cellulose acetate filament composite mixed yarn of the present invention can dissolve cellulose acetate in the ultrafine cellulose acetate filament yarn having an average single fiber fineness of 0.6 dtex or more and less than 1.1 dtex, in the ultrafine cellulose acetate filament yarn. When the solvent content is 5 to 25% by weight, the composite ratio is 50 to 90.
% By a method of mixing and entanglement with other filament yarns.

[0013] The ultrafine cellulose acetate filament yarn is inevitably reduced in strength as compared with the ordinary cellulose acetate filament yarn having a fineness of single fiber. Occurs. In the method of the present invention, the ultrafine cellulose acetate filament yarn is mixed and entangled with another filament yarn in a state where the ultrafine cellulose acetate filament yarn contains 10 to 20% by weight of a solvent capable of dissolving cellulose acetate. is necessary.

According to the method of the present invention, the solvent contained in the ultrafine cellulose acetate filament yarn acts as a plasticizer or a softening agent for the cellulose acetate filament, and the ultrafine cellulose acetate filament yarn at the time of the mixing and entanglement process is used. It significantly suppresses fluff and fluff. When the solvent content is less than 10% by weight, there is no effect of suppressing the generation of fluff and fluff.

In order to make the ultrafine cellulose acetate filament yarn contain a solvent capable of dissolving cellulose acetate, it is preferable that 10 to 20% by weight of the solvent of the stock solution for spinning during the spinning is not completely evaporated by dry spinning.
The residual amount of the solvent can be adjusted by controlling the temperature of the heated air for spinning the spinning dope. The use of the filament yarn in a state in which the solvent remains does not require a solvent attaching step, and makes the production of the cellulose acetate filament composite mixed yarn of the present invention extremely advantageous.

In the blending and entanglement treatment, an ultrafine cellulose acetate filament yarn introduced into a nozzle using a fluid ejecting apparatus, for example, an interlace nozzle, so that the number of entanglements is 80 pieces / m or more, preferably 100 pieces / m or more. And preferably 0.2 to 0.3 air pressure for other filament yarns
Although it is performed by injecting air of MPa, as long as the predetermined confounding is given, the fluid ejecting apparatus, the air pressure and the like are not particularly limited, and according to the type of the filament yarn, the single fiber fineness, the total number of filaments, and the like. It can be changed as appropriate.

FIG. 1 shows an example of the production of a preferred cellulose acetate filament composite fiber by the method of the present invention. In FIG. 1, in a step in which the microfine cellulose acetate filament yarn 1 spun from the spinneret 2 into the heated air in the heating cylinder 3 is wound up on the bobbin 8 via the oiling device 4 and the take-up roller 5, The other filament yarn 6 is supplied to the take-up roller 5 with or without passing through the oiling device 4, and the fluid ejection device 7 provided between the take-up by the take-up roller 5 and the winding to the bobbin 8 is provided with a very fine filament yarn. The cellulose acetate filament yarn 1 and the other filament yarn 6 are simultaneously guided, mixed and entangled,
It is wound up on the bobbin 8 as a composite mixed yarn.

[0018]

The present invention will be described below in more detail with reference to examples. The evaluation items in the examples were based on the following method.

[Number of confounds] Rothschild (ROTHSCHI)
Using an entanglement tester R2040 manufactured by LD) Co., Ltd., the opening length L (cm) between the entangled portions at an initial tension (fiber dtex × 0.22) g, a trip level tension of 3.4 g, and a measuring yarn speed of 1.2 m / min. ) Is measured, and the sample yarn 1 is calculated by the following equation.
The number of confounds per m was determined. Number of confounds (pieces / m) = 100 / L

[Hand] A knitted fabric is knitted using the obtained composite mixed yarn, and a sensory evaluation is performed by touch for softness, wetness, and hand feeling. Was evaluated as x.

(Examples 1-3, Comparative Examples 1-2) Degree of acetylation 6
1.6% cellulose triacetate in methylene chloride /
It was dissolved in a solvent of a methanol mixture to prepare a spinning dope having a polymer concentration of 21% by weight. This spinning solution is spun from a spinneret into heated air at 56 ° C., and a take-up speed of 350 m /
At the same time as obtaining a cellulose triacetate filament yarn shown in Table 1, a 33 dtex / 12 filament polyethylene terephthalate filament yarn is supplied at a supply speed of 350 m / min to a cellulose triacetate filament yarn take-up roller, and the cellulose triacetate filament yarn is supplied. The polyethylene terephthalate filament yarn and the polyethylene terephthalate filament yarn were led together into an interlace nozzle, and mixed and entangled at an air pressure of 0.245 MPa to obtain a composite mixed yarn. Table 1 shows the physical properties, the number of entanglements, the evaluation results of the texture, and the post-process passability of the obtained composite mixed fiber.

[0022]

[Table 1]

Examples 1 to 3 show good spinning stability, the strength and elongation do not impair the passability in the subsequent process, and the texture is also supple, soft, wet and hand-held. It was something with a feeling. Comparative Example 1 was poor in flexibility and poor in softness and wetness, and Comparative Example 2 was poor in resilience and poor in holding feeling.

(Examples 4 to 8, Comparative Examples 3 to 7) Example 1
Using the same spinning solution as used in Example 1, spinning was performed from a spinneret into heated air at 60 ° C., and Example 4, Comparative Examples 3 and 4 were spun at a take-up speed of 500 m / min, and Examples 5, 6, 7, 8, Comparative Examples 5, 6, and 7 were spun at a take-up speed of 400 m / min to obtain a cellulose triacetate filament yarn shown in Table 2 and, at the same time, a polyethylene terephthalate filament yarn shown in Table 2 at the same speed as the take-up speed. The cellulose triacetate filament yarn is supplied to a take-up roller, and the cellulose triacetate filament yarn and the polyethylene terephthalate filament yarn are led into the interlace nozzle in a state where they are aligned.
The mixed fiber was entangled at 5 MPa to obtain a composite mixed yarn. Table 2 shows the physical properties, the number of entanglements, and the texture evaluation results of the obtained composite mixed fiber.

[0025]

[Table 2]

Comparative Example 3 was poor in flexibility and poor in softness and wetness, and Comparative Example 4 was poor in yarn physical properties, poor in post-twisting, weaving and other post-processability, and Comparative Example 5 In Comparative Examples 6 and 7, the yarn properties were low, and the entanglement level was low.

(Example 9, Comparative Example 8) The same spinning dope as used in Example 1 was spun out from a spinneret into heated air at different temperatures of 31 to 82 ° C., and the take-off speed was 3
At the same time, a cellulose triacetate filament yarn of 67 dtex / 80 filament having the remaining amount of the solvent shown in Table 3 which decreases in inverse proportion to an increase in the temperature of the heated air is obtained, and a polyethylene terephthalate filament yarn of 33 dtex / 12 filament is obtained. The cellulose triacetate filament yarn is fed to the take-up roller of the cellulose triacetate filament yarn at the same speed as the take-up speed, and the cellulose triacetate filament yarn and the polyethylene terephthalate filament yarn are led into the interlace nozzle in a state where they are aligned, and mixed by the air pressure shown in Table 3. The fibers were entangled to obtain a composite mixed yarn. The generation state of the fluff of the obtained composite mixed yarn is
Fluff counter (DT-10 manufactured by Toray Engineering Co., Ltd.)
(4F type) at a measurement speed of 211.1 m / min and a measurement time of 5 minutes. The results are shown in Table 3.

[0028]

[Table 3]

In Comparative Example 8, with the decrease in the amount of residual solvent,
Although the number of confounds increases, the fluff increases drastically. Also, in the ninth embodiment, when the air pressure increases, the fluff tends to increase.
It turns out that it is preferable to be less than MPa.

[0030]

The ultrafine cellulose acetate filament yarn of the present invention is preferable as a composite material in a composite mixed yarn, and is a cellulose acetate filament composite mixed yarn obtained by combining another filament yarn with the ultrafine cellulose acetate filament yarn. Has good passability in the post-process, and softness, wetness,
It gives a feeling of holding and swelling, and particularly when the other filament yarn is a polyester filament yarn, the difference in heat shrinkage makes the feeling of holding more favorable. In addition, the cellulose acetate filament composite mixed yarn can be produced in the production process of the ultrafine cellulose acetate filament yarn, and can be produced in a step-saving manner. Therefore, it can be said that the significance of the present invention is extremely large.

[Brief description of the drawings]

FIG. 1 is a process chart showing a production example of a cellulose acetate filament composite mixed yarn of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Microfine cellulose acetate filament yarn 2 Spinneret 3 Heating cylinder 4 Oiling device 5 Take-up roller 6 Other filament yarn 7 Fluid ejection device 8 Bobbin

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-126817 (JP, A) JP-A-10-110337 (JP, A) JP-A-10-226934 (JP, A) 4558 (JP, B1) Special Table Hei 8-501606 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) D02G 1/00-3/48 D01F 2/28-2/30

Claims (5)

(57) [Claims] 1. An ultrafine cellulose acetate filament yarn having an average single fiber fineness of 0.6 dtex or more and less than 1.1 dtex and another filament yarn, wherein the composite ratio of the cellulose acetate filament yarn is 50 to 90%,
A cellulose acetate filament composite mixed yarn having a number of entanglements of 100 / m or more. 2. The cellulose acetate filament composite fiber yarn according to claim 1, wherein the ultrafine cellulose acetate filament yarn comprises cellulose acetate having an acetylation degree of 56.2 to 62.5%. 3. The mixed cellulose acetate filament yarn according to claim 1, wherein the other filament yarn is a polyester filament yarn. 4. An ultrafine cellulose acetate filament yarn having an average single fiber fineness of 0.6 dtex or more and less than 1.1 dtex, wherein a solvent capable of dissolving cellulose acetate in the cellulose acetate filament yarn is 10 to 20.
In a state where the weight% is contained, the fiber is mixed and entangled with another filament yarn at an air pressure of 0.2 to 0.3 MPa at a composite ratio of 50 to 90% to give an entanglement of 100 yarns / m or more. A method for producing a mixed fiber of cellulose acetate filaments. 5. The method according to claim 4, wherein a polyester filament yarn is used as the other filament yarn.