JP2002161434A - Polyester slub yarn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new polyester slub yarn having excellent natural feeling and spunized appearance and giving dry feeling. SOLUTION: The polyester slub yarn contains filaments having thick and thin parts distributed along the direction of length. The yarn exhibits peak values (Pmax1, Pmax2) corresponding to the period of 4-10 cm and 50-150 cm on the spectrograph obtained by normal test and the ratio of the peak values (Pmax1/Pmax2) is 1.5-4.0.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel polyester plaque having excellent natural feeling, dry feeling and spanning appearance.

[0002]

2. Description of the Related Art It is well known that a mottled yarn is obtained when an undrawn polyester yarn is incompletely drawn. Naturally, the more the mottling is emphasized, the more the texture such as texture appears.However, if the mottling is emphasized too much, the natural feeling is impaired or the low-oriented unstretched portion remains. There is a problem that handling properties and mechanical properties are deteriorated.

To solve this problem, Japanese Patent Publication No. 3-77
Japanese Patent Publication No. 304 proposes a mottled yarn in which the thick portion of the mottled yarn is in a special dispersed state, and the value of a period of 50 cm on a spectrograph obtained by a normal test as a yarn is 以下 or less of the maximum value. ing. Certainly, this mottled yarn has improved mechanical properties and handleability, but its feel is still insufficient depending on the application, and further improved natural feeling,
There is a demand for the development of a mottled yarn exhibiting a dry feeling and a spanized appearance.

[0004]

SUMMARY OF THE INVENTION The present invention has been made on the basis of the above-mentioned prior art, and an object of the present invention is to provide a novel polyester yarn having an excellent natural feeling and a spanized appearance and a good dry feeling. To provide.

[0005]

[Means for Solving the Problems] According to the research of the present inventors,
For example, an object of the present invention is to provide a “single fiber having a thickness in the length direction.
In the case of multifilament yarn containing fibers,
On the spectrograph obtained by the normal test,
Cycles of 4 to 10 cm and 50 to 150 cm
Peak value (P_max1, P_max2) Is present and its peak value
Ratio (P_max1/ P _max2) Is 1.5 to 4.0.
Polyester plaques to characterize. Can be achieved by
Was found.

[0006]

Embodiments of the present invention will be described below in detail. The polyester in the present invention is mainly made of a polyester having ethylene terephthalate, trimethylene terephthalate or tetramethylene terephthalate as a main repeating unit, and among them, polyethylene terephthalate is preferable. Such a polyester may optionally be copolymerized with a small amount of the third component (usually 15 mol% or less, preferably 10 mol% or less, particularly preferably 5 mol% or less based on all repeating units), Further, it may contain a matting agent and other additives. Above all, by performing alkali weight reduction treatment, when the surface or inside of the fiber contains a micropore forming agent that forms micropores or microgrooves, depending on the shape of the pores or grooves, water absorption, It is preferable because various effects such as natural silk feeling, sharpness, and dry touch can be exhibited.

For example, when a metal sulfonate represented by the following general formula (I) is contained as the fine pore-forming agent, dry feeling is improved and performance similar to cotton can be obtained.

[0008]

Embedded image

In the formula, M and M 'are metals, preferably alkali metals, alkaline earth metals, manganese, cobalt and zinc, and M and M' may be the same or different.
R is a hydrogen atom or an ester-forming functional group, and n is 1
Or 2.

As the sulfonic acid metal salt, those described in, for example, JP-B-61-31231 are preferably used, and specifically, sodium 3-carbomethoxybenzenesulfonate-5-sodium carboxylate,
Sodium hydroxyethoxycarbonylbenzenesulfonate-1 / 2 magnesium carboxylate can be mentioned.

The sulfonic acid metal salt may be added to the polyester at any stage before melt-spinning the polyester. For example, the sulfonic acid metal salt may be added to the raw material of the polyester or may be added during the synthesis of the polyester. Good. Also,
When the amount of the above compound is small, the cotton-like feeling of the finally obtained polyester fiber is reduced, and when the amount is large, a trouble is apt to occur at the time of spinning. % By weight, especially 0.6 to 1.2
A weight percent range is appropriate.

Next, the spectrograph in the present invention means a Worcester spectrograph developed by Zuervega of Switzerland. The measurement conditions are normal test, and the measurement speed is 400 m / min. This Worcester spectrograph enables rapid analysis of plaque contents, and is particularly useful for knowing the pitch of plaques. The details are described in "Theory and Practice of Unevenness", 255 Pp. 372-372.

Examples of spectrographs of the plaque of the present invention and a conventional plaque are shown in FIGS. 1 and 2 and will be described in detail with reference to the drawings. FIG. 1 is a spectrograph of the plaque obtained in Example 1 of the present invention described later, while FIG. 2 is a spectrograph of the conventional plaque. A comparison between FIG. 1 and FIG. 2 shows that there is a characteristic difference in the number of peaks. That is, in the mottled yarn of the present invention, the mottle is dispersed such that the maximal value is present at two places, that is, a long portion having a mottle period of 50 to 150 cm and a short portion having a length of 4 to 10 cm. It was found to exhibit a more natural spanised appearance as compared to the plaque without the local maximum.

That is, in the present invention, the period 4 to 10c is displayed on the spectrograph obtained by the normal test.
m, preferably 5 to 8 cm, cycle 50 to 150 cm,
Preferably, the peak values (P _max1 , P _max2 ) are present in the range of 80 to 120 cm, and the peak value ratio (P _max1 / P _max2 ) is 1.5 to 4.0, preferably 1.
It is important that the ratio be 5 to 2.0. Or had only the peak value is one, or, or a position outside the range of the peak value, and further, the peak value ratio (P _{ma x1} / P
_{When max2} ) is outside the above range, the random dispersibility of the thick part is reduced, and the natural feeling is reduced, or the dry feeling and the spanized appearance are reduced, so that the object of the present invention cannot be achieved. .

The period 20c on the spectrograph
The ratio of the value P _{20 at} m to the peak value P _max1 (P _max1 / P ₂₀ )
Is in the range of 1.5 to 4.0, preferably 2.0 to 3.0, since the natural feeling, dry feeling, spanning appearance and the like are further improved.

On the other hand, if the length of the thick portion of the single fiber is too long, the natural appearance of the fabric tends to decrease,
Conversely, if the length is too short, the characteristics of the plaque become difficult to develop, so a range of 1 to 15 mm, particularly a range of 3 to 10 mm is appropriate. Worst normal U% as a thread
Is preferably 3.5% or more, more preferably 4.5% to 8.0%, in that the unevenness when touching the fabric and the natural appearance can be compatible.

The apparent single fiber fineness (thickness averaged in the length direction) and the total fineness as a yarn are not particularly limited, but the single fiber fineness is 1.5 to 5.0 dt.
ex and the total fineness are suitably in the range of 40 to 170 dtex.

There is no particular limitation on the cross-sectional shape of the single fiber, and the natural spanished appearance, which is the object of the present invention, can be achieved even with a round cross-section. Is preferred.

The polyester plaque of the present invention described above can be produced, for example, by the following method. That is, the above-mentioned polyester is heated at a temperature of 280 to 30.
It is melted at 0 ° C., melted and discharged from a spinneret, and an oil agent is applied to the cooled and solidified spun yarn, and the pressure is 0.1 to 0.3 MPa using an interlace applying device having three or more air injection holes.
And then applying an interlace by applying air, a semi-drawn yarn (a pre-heating roller take-up speed: 1500 to 2500 m / min, a draw ratio: 1.1) through a pre-heating roller and a drawing roller set at a temperature not higher than the glass transition temperature of the polyester. ~
1.5) is once wound up on a winder. Then, the obtained semi-drawn yarn is stretched at a drawing speed of 600 to 1400 m / min.
Preheating roller heated to 0-110 ° C and 170-2
After passing through a non-contact heater set at 20 ° C., 1.1 to 2.
Stretched at a stretch ratio of 0 times, and if necessary,
It is obtained by applying heat setting at a draw ratio of 0.8 to 1.1 times through a contact or non-contact heater set at 190 ° C.

In order to produce a fabric using the above-described polyester plaques of the present invention, an appropriate twist may be applied if necessary, and the fabric may be woven or knitted into a desired structure. The obtained fabric is subjected to an alkali weight reduction treatment as necessary,
This is preferable because a material having an excellent spanized appearance, a natural feeling, and a dry feeling, which cannot be exhibited by a conventional woven or knitted fabric, can be obtained.

In the present invention, it is not preferable to weave or knit into a complicated structure because the spanning appearance, natural feeling, and dry feeling are intended. It is preferable to knit into a variable structure, a satin weave or the like. The proportion of the mottled yarn of the present invention in the fabric is not necessarily required to be 100%, but the larger the proportion is, the more preferable in order to obtain an excellent spanized appearance, natural feeling and dry feeling.

[0022]

The present invention will be described in more detail with reference to the following examples, which should not be construed as limiting the invention thereto.

Example 1 Dimethyl terephthalate 197
Fraction, 124 parts of ethylene glycol, 4 parts of sodium 3-carbomethoxybenzenebenzenesulfonate-5 parts of sodium carboxylate (1.3 mol% based on dimethyl terephthalate), and 0.118 part of calcium acetate monohydrate Put in a glass flask, and perform transesterification according to a conventional method.
After the theoretical amount of methanol was distilled off, the reaction product was placed in a polycondensation flask equipped with a rectifying column, and 0.112 parts of trimethyl phosphate as a stabilizer and 0.079 parts of antimony oxide as a polycondensation catalyst were added. , 20 under normal pressure
After reacting under reduced pressure of 30 mmHg for 15 minutes, the reaction was performed under high vacuum for 80 minutes. The final internal pressure is 0.38 mmHg, and the resulting modified polymer has an intrinsic viscosity of 0.640,
The softening point was 258 ° C. After completion of the reaction, the modified polymer was formed into chips according to a conventional method.

The obtained chips are dried according to a conventional method, melt-discharged from a spinneret, and the discharged yarn is cooled and solidified, an oil is applied, and then the pressure is reduced to 0 by an interlacing device having three nozzles. After applying interlace using air of .15 MPa, the film was taken up at a speed of 2250 m / min, stretched halfway at a speed of 3030 m / min, and wound up. The obtained semi-drawn yarn is subjected to a preheating roller temperature of 87 ° C, a heat set heater (non-contact type) temperature of 200 ° C, and a draw ratio of 1.4.
After drawing at a drawing speed of 800 m / min, a heat set heater (contact type) at a temperature of 175 ° C. and a draw ratio of 0.98 were heat-set and wound to obtain a yarn of 120 dtex / 36 filaments.

The obtained yarn is used for warp and weft yarns, woven into a double layer, scoured, heat-set, alkali weight-reduced (weight loss rate: 15%) and dyed according to a conventional method to give a plain dyed fabric. Obtained. Table 1 shows the evaluation results.

Each of the evaluation items was a sensory evaluation by five skilled panelists, and all of the panelists judged very good (good) and three or more panelists judged good (OK).
Those judged as bad by three or more persons were ranked as "bad" (three ranks).

Example 2 Example 2 was the same as Example 1 except that air at a pressure of 0.25 MPa was used in the interlacing device. The results are shown in Table 1.

Example 3 The procedure was the same as in Example 1 except that a spinneret having a round cross-sectional discharge hole was used. The results are shown in Table 1.

[Comparative Example 1] In the same manner as in Example 1, except that the yarn before entering the preheating roller was passed through a bending guide to stretch the semi-drawn yarn, causing tension fluctuation. The results are shown in Table 1.

Comparative Example 2 The drawing ratio of the semi-drawn yarn was 1.0
The same procedures as in Example 1 were performed except that the number was changed to 5. Table 1 shows the results
Shown along with.

Comparative Example 3 The draw ratio of the semi-drawn yarn was 1.0
Same as Example 3 except for changing to 5. Table 1 shows the results
Shown along with.

Comparative Example 4 The procedure of Example 1 was repeated except that air at a pressure of 0.05 MPa was used in the interlacing apparatus. The results are shown in Table 1.

Comparative Example 5 The procedure was the same as in Example 1 except that air at a pressure of 0.40 MPa was used in the interlacing apparatus. The results are shown in Table 1.

Comparative Example 6 The drawing ratio of the semi-drawn yarn was 1.0
The same procedures as in Example 1 were performed except that the number was changed to 5. Table 1 shows the results
Shown along with.

[0035]

[Table 1]

[0036]

According to the polyester plaque of the present invention, a fabric having a natural feeling, a dry sensation when touched, and a spanized appearance which is not seen in the conventional polyester plaque can be obtained. In the case of containing a fine pore-forming agent, it is possible to obtain a cotton-like fabric excellent in characteristics such as deep color, sweat absorption, and comfort during wearing, and its industrial value is extremely large. is there.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a spectrograph of a polyester plaque of the present invention.

FIG. 2 is a diagram showing an example of a spectrograph of a conventional polyester yarn.

Claims (7)

[Claims] 1. A multifilament yarn containing a single fiber having a thickness in the length direction, wherein the yarn has a period of 4 to 10 on a spectrograph obtained by a normal test.
and the peak value (P
_max1 , _Pmax2 ) and their peak value ratio ( _Pmax1)
/ P _max2 ) is from 1.5 to 4.0. 2. A ratio (P _max1 / P ₂₀ ) of a value P ₂₀ and a peak value P _max1 at a period of 20 cm on the spectrograph obtained in a normal test, at a period of 20 cm, is 1.5 to 4.0. Polyester plaque. 3. A wool normal U as a yarn having a thick portion of a single fiber having a thickness in the length direction of 1 to 15 mm.
The polyester plaque according to claim 1 or 2, wherein the percentage is 3.5% or more. 4. The boiling water shrinkage ratio is 10% or less.
4. The polyester plaque according to any one of items 3 to 3. 5. The polyester plaque according to claim 1, wherein the cross section of the single fiber is triangular. 6. The polyester plaque according to claim 1, wherein the polyester contains a micropore-forming agent. 7. The polyester plaque according to claim 1, wherein the microporous forming agent is a metal salt compound represented by the following general formula. Embedded image [Wherein, M and M ′ are metals, R is a hydrogen atom or an ester-forming functional group, and n is 1 or 2.]