JP4943371B2 - Method for producing cellulose acetate mixed yarn - Google Patents

Description

  The present invention relates to a method for producing a cellulose acetate mixed yarn having characteristics excellent in bulkiness and texture.

Cellulose acetate fiber is a characteristic fiber that is mainly made of natural pulp and is said to be semi-synthetic fiber and also has the characteristics of natural fiber. That is, cellulose acetate fiber has many excellent properties as a fiber for clothing such as elegant luster, deep color tone, color development, dry feeling, and moderate moisture absorption, so it is different from other synthetic fibers. It has been positioned as a luxury clothing material.
On the other hand, in Patent Document 1, for the purpose of providing a cellulose acetate fiber material imparted with a bulky and lightweight feeling that is less likely to become wrinkles, the cellulose acetate fiber is elongated at the time of hydrothermal treatment in post-processing. A method is described.

JP 2001-115329 A

However, in the example described in Patent Document 1, the elongation (BWS) is less than 5%, and is less effective in terms of bulkiness and soft texture, and is extremely adapted to the diversification of consumer needs. It was difficult to express bulkiness and soft differences.
Moreover, it was obtained by blending with other fibers having different extensibility, and the fiber bundle wound in the spinning process did not exhibit the effect as it is. Therefore, there is a risk of trouble in the post-processing process and occurrence of defects in the process.

The gist of the present invention is a blended yarn composed of diacetate fiber and triacetate fiber, and specifically, a blended yarn in which diacetate fiber and triacetate fiber are spun at the same time under the conditions satisfying the following (1) to (3). It exists in the manufacturing method of a fiber yarn.
(1) 0.15 <Vf / Vja <0.50 and 1200 <Vja <1650
(2) 0.15 <Vf / Vjb <1.20 and 200 <Vjb <1650
(3) 300 ≦ Vf ≦ 700
(A negative value for the shrinkage indicates that the shrinkage is expanding.)
In the formula, Vf is the take-up speed during spinning (m / min), Vja is the discharge linear speed from the spinning nozzle of the spinning solution of diacetate fiber (m / min), and Vjb is the spinning of the spinning solution of triacetate fiber. The discharge linear velocity (m / min) from the nozzle is shown.

  The blended yarn of the present invention can efficiently blend a cellulose acetate blended yarn excellent in bulkiness and texture by blending both materials of diacetate fiber and triacetate fiber at the time of spinning.

In the cellulose acetate mixed yarn of the present invention, the diacetate fiber and the triacetate fiber must be produced under the conditions satisfying the following (1) to (3).
(1) 0.15 <Vf / Vja <0.50 and 1200 <Vja <1650
(2) 0.15 <Vf / Vjb <1.20 and 200 <Vjb <1650
(3) 300 ≦ Vf ≦ 700
In the formula, Vf is the take-up speed during spinning (m / min), Vja is the discharge linear speed from the spinning nozzle of the spinning solution of diacetate fiber (m / min), and Vjb is the spinning of the spinning solution of triacetate fiber. The discharge linear velocity (m / min) from the nozzle is shown.

In carrying out the present invention, when Vf / Vja is 0.15 or less and when Vf / Vja is 0.50 or more, the drying behavior cannot catch up with the take-up speed, and continuous spinning becomes unstable, which is not preferable.
When Vja is 1200 or less, sufficient drying strain in the fiber axis direction is not formed, and the target elongation rate cannot be obtained. Further, when Vja is 1650 or more, the discharge direction is disturbed and the continuous spinning becomes unstable, which is not preferable.

On the other hand, when Vf / Vjb is 0.15 or less and when Vf / Vjb is 1.20 or more, problems similar to those of diacetate fiber occur, which is not preferable.
On the other hand, when Vjb is 200 or less, the feed amount of the raw material decreases, and the discharge amount becomes unstable, which is not preferable. Further, when Vjb is 1650 or more, the discharge direction is disturbed and the continuous spinning becomes unstable, which is not preferable.

  Further, when Vf is smaller than 300, productivity is low, and when Vf exceeds 700, the confounding property of the two components is inferior, and sufficient different shrinkage characteristics cannot be exhibited.

In the present invention, it is preferable that the diacetate fiber and the triacetate fiber constituting the mixed yarn have a diacetate fiber elongation of 5% or more and a triacetate fiber shrinkage of 0% or more.
If the elongation rate of diacetate fiber is less than 5%, the conventional bulkiness and softness will remain as it is, and it will be difficult to express extreme bulkiness and softness to meet diversifying consumer needs. is there.
On the other hand, even when the shrinkage rate of the triacetate fiber is less than 0%, it is difficult to express extreme bulkiness and soft difference.

Further, when the fineness ratio of diacetate fiber and triacetate fiber is diacetate fiber / triacetate fiber <0.5, it becomes difficult to contribute to the texture of the mixed yarn that gives the elongation characteristics of diacetate fiber. If the single fiber fineness is 6 dtex or more, the texture becomes hard, which is not preferable.
In carrying out the present invention, a cellulose triacetate spinning solution and a cellulose diacetate spinning solution are spun simultaneously from different spinnerets by providing a predetermined distance between the two spinnerets. In spinning, the interval between the spinning spindles is set in advance. The yarn discharged from each spinning spindle and dry-spun is air entangled into a mixed yarn.

  The woven or knitted fabric containing the blended yarn of the present invention is compounded with other fibers by knitting, knitting or knitting, and in these cases, the blended yarn of the present invention is contained in an amount of 20% by mass or more. It is preferable. If it is less than 20% by mass, it is difficult to obtain the effect of swelling.

  Hereinafter, the present invention will be described with reference to examples. In addition, each evaluation followed the following method.

[Hot water shrinkage]
A ten-throw firewood having a test length of 1 m is prepared under a tension of 1/27 g per 1 dtex, a load of 2 / 2.7 g per 1 dtex is applied, and the initial length (L0) is measured. After immersing the heel in 120 ° C. hot water for 30 minutes in an unloaded state, the load is again applied to measure the measurement heel length (L1), which is calculated from the following equation.
Hot water shrinkage (%) = (L0−L1) / L0 × 100
(Measurement of strength and elongation)
It calculated | required based on JIS-L1013-8.5 (tensile strength and elongation rate). The measurement was performed using a strong elongation measuring device (product name: RTA-500, manufactured by Orientec Corp.).
[Bulky]
Bulkiness was measured by the JIS-L1018 method.

(Examples 1-8)
A spinning stock solution in which cellulose triacetate in which 97% of hydroxyl groups are acetated is dissolved in a mixed solvent of methylene chloride / methanol, and cellulose diacetate in which 80.3% of hydroxyl groups are acetated are mixed in a solvent mixture of methylene chloride / methanol. The spinning stock solution dissolved in the yarn is dry-spun under the conditions shown in Table 1 and Table 2 below, with the distance between adjacent spinning spindles being 15 cm, and then a compressed air flow is applied from a direction perpendicular to the yarn. Using an interlace nozzle, entanglement of 35 pieces / m was given to obtain a mixed yarn composed of cellulose triacetate fibers and cellulose diacetate fibers.
When the obtained blended yarn was formed into a tubular knitted fabric of 8 cm width knitted with 30 gauge and subjected to hot water treatment at 120 ° C. for 30 minutes, the knitted fabric had a texture with a strong feeling of swelling.

(Comparative Example 1)
Similarly to Example 2, dry spinning was performed under the conditions described in Comparative Example 1 described in Table 1 and Table 2 below, and an interlace nozzle was used to apply a compressed air flow from a direction perpendicular to the yarn. 35 / m was entangled to obtain a mixed yarn composed of 40 dtex cellulose triacetate fiber and 40 dtex cellulose diacetate fiber.
When the obtained mixed yarn was formed into a tubular knitted fabric of 8 cm width knitted with 30 gauge and subjected to hot water treatment at 120 ° C., the knitted fabric had a texture with a weak feeling of swelling.

(Comparative Example 2)
As in Examples 1 to 8, dry spinning was performed under the conditions described in Comparative Example 3 described in Tables 1 and 2 below, and entangled by air entanglement, and 80 dtex cellulose triacetate fiber and 25 dtex cellulose dice. A mixed yarn made of acetate fibers was obtained.
When the obtained mixed yarn was made into a tubular knitting and subjected to hot water treatment at 120 ° C., the knitted fabric had a texture with a weak feeling of swelling.

Example 9
The cellulose acetate mixed yarn obtained in Example 2 and the polyester fiber having the self-crimping expression due to the difference in shrinkage at the time of hydrothermal treatment at 33 dtex 12f were air mixed to produce a 113 dtex 35f filament mixed yarn. A woven fabric (warp: 174 / 吋, weft: 97 / 吋) was prepared, and after dyeing, dry heat treatment was performed at 170 ° C. for 1 minute. The obtained woven fabric (warp: 190 / pile, weft: 98 / pile) was excellent in bulkiness and had a soft texture with a feeling of swelling. The bulkiness of this fabric was 3.6 cm ³ / g.

Claims (1)

In the manufacturing method of the cellulose acetate mixed yarn which spins and mixes a diacetate fiber and a triacetate fiber simultaneously, the manufacturing method satisfy | fills following (1)-(3).
(1) 0.15 <Vf / Vja <0.50 and 1200 <Vja <1650
(2) 0.15 <Vf / Vjb <1.20 and 200 <Vjb <1650
(3) 300 ≦ Vf ≦ 700
In the formula, Vf is the take-up speed during spinning (m / min), Vja is the discharge linear speed from the spinning nozzle of the spinning solution of diacetate fiber (m / min), and Vjb is the spinning of the spinning solution of triacetate fiber. The discharge linear velocity (m / min) from the nozzle is shown.