JP5247296B2 - Polyester monofilament yarn - Google Patents

Description

  The present invention relates to a so-called straight split yarn having no crimp, and more particularly to an ultrafine monofilament yarn obtained by alkali splitting.

  Monofilament yarns include monofilament yarns obtained directly by spinning and drawing, and so-called straight split yarns obtained by once obtaining multifilament yarns and then dividing them one by one. . These are mainly used in the curtain field and the bridal field, and are particularly preferably used as a thin fabric for organdy that is light and has a feeling of tension.

  As an example of straight splitting yarn, for example, Patent Document 1 discloses a polyester monofilament yarn containing a calcium atom and a phosphorus atom and having a trilobal cross section as a cross-sectional shape. A thin fabric for organdy having properties and transparency can be obtained.

Patent Document 2 discloses a modified polyester monofilament yarn including an isophthalic acid component containing a metal sulfonate group and having an atypical cross section. This yarn is also suitable as a yarn constituting a thin fabric for organdy, and greatly contributes to improvement in color development, sharpness, strength and the like.
JP-A-9-241923 JP-A-9-268432

  In general, straight split yarns are difficult to produce from the viewpoint of spinnability and split manipulability, and it is difficult to produce those with single yarn fineness. Is limited to relatively thick threads. When thick yarn is used, the texture of the product generally tends to harden, but even if the yarn is thickened, the function does not deteriorate, so the previous research has focused solely on improving the function. However, no research on texture improvement has been made.

  However, as consumer needs have diversified, products that belong to the curtain and bridal fields have a micro-touch texture and are superior in quality. Requests have been made. However, at present, an organdy thin fabric is not provided as much as possible to realize this demand, and of course, no straight split yarn is provided for that purpose.

  The present invention eliminates the disadvantages of the prior art, and provides a polyester monofilament yarn suitable for obtaining an unprecedented thin fabric having a micro-touch texture and excellent quality. Objective.

  As a result of intensive studies to solve the above-mentioned problems, the inventors of the present invention once made a woven fabric using a composite monofilament yarn, and then splitting the composite monofilament yarn with an alkali, the woven fabric is composed of ultrafine yarn. As a result, it has been found that a micro-touch texture can be realized, and at the same time, the deterioration of quality due to Parnbique can be suppressed, and the present invention has been made.

That is, the gist of the present invention is as follows.
(1) A woven fabric comprising monofilament yarns obtained by splitting a wedge-divided composite polyethylene terephthalate multifilament yarn having a total fineness of 50 to 480 dtex and a single yarn fineness of 3.0 to 30.0 dtex, the monofilament A thin woven fabric for organdy, wherein the single yarn fineness after alkali splitting of the yarn is 0.1 to 3.0 dtex and has no crimp .
(2) The organdy thin fabric according to claim 1, wherein the wedge-divided composite polyethylene terephthalate multifilament yarn has 6 to 16 filaments.
(3) The thin fabric for organdy according to claim 1 or 2, wherein the number of divisions of the monofilament yarn is eight.

  By using the monofilament yarn of the present invention, it is possible to realize a micro touch soft texture that could not be expressed so far in a woven fabric. Moreover, since the refractive index of light is changed by making it ultrafine, it is possible to greatly suppress the fabric defects caused by permbiquets, which are often found in straight splitting yarns.

  Hereinafter, the present invention will be described in detail.

  The present invention is directed to an ultrathinned polyester monofilament yarn obtained by alkali splitting. In the present invention, in particular, a so-called straight splitting yarn having a linear form without a crimp is provided. Is targeted.

  Examples of the monofilament yarn of the present invention include a monofilament yarn having a wedge-shaped cross section as shown in FIG. FIG. 1 shows a cross-section of a composite polyester monofilament yarn in which eight monofilaments (a) are joined with a polyester-based binder (b) interposed therebetween, and the monofilament yarn of the present invention is obtained by alkali splitting. It is. Alkali splitting refers to dissolving and removing the polyester-based binder (b) with an aqueous alkali solution, and a plurality of monofilaments (a) can be obtained simultaneously as shown in FIG. In addition, as a cross-sectional shape of a thread | yarn, in FIG. 1, a round cross section and FIG. 2 wedge shape are illustrated, However, This invention is not limited to these, You may employ | adopt arbitrary cross-sectional shapes according to the objective. Needless to say, it is good.

  The composite polyester monofilament yarns (a) and (b) are both made of polyester. Basically, polyethylene terephthalate (PET) or a copolymer polyester (PET copolymer polyester) containing PET as a main component is used. It can be preferably applied.

  However, the dissolution rate with respect to the aqueous alkali solution is higher in the bonding agent (b) than in the monofilament yarn (a). From this point, it is preferable to employ polyesters having different compositions as the polyester constituting both. As a difference in dissolution rate, (b) is generally preferably about 2 to 20 times faster than (a). In order to realize such a speed difference, for example, while PET is applied to (a), the bonding agent (b) includes 10 to 30% by mass of polyethylene glycol having a weight average molecular weight of 2000 to 10,000, It is preferable to apply a PET copolymer polyester containing 1 to 3 mol% of 5-sodium sulfoisophthalic acid as a copolymerization component.

  The polyester monofilament yarn of the present invention can be obtained by alkali splitting a specific composite polyester monofilament yarn as described above. As such a composite polyester monofilament yarn, the single yarn fineness is 3.0 to 30.0 dtex, and the hot water shrinkage is Use up to 15% yarn. When the single yarn fineness is less than 3.0 dtex, it becomes difficult to handle the yarn in the fabric preparation process and the weaving process, and the fineness of the obtained monofilament yarn becomes too thin, which causes a problem in practical use. On the other hand, if it exceeds 30.0 dtex, the cooling effect at the time of spinning becomes poor, and as a result, there is a problem in operation such as fusion between yarns is likely to occur. May remain. Furthermore, if the hot water shrinkage rate exceeds 15%, the shrinkage force of the fabric becomes too strong, and as a result, the fineness of the monofilament yarn becomes thick and the texture of the fabric is impaired, and the dimensional stability of the fabric also decreases. The hot water shrinkage is particularly preferably 5 to 10%.

  In order to obtain the composite monofilament yarn in the present invention, it can be said that it is preferable to obtain it by directly spinning and drawing in consideration of cost. However, first, a multifilament yarn is obtained, and then this is separated one by one. Thus, it is preferable to obtain the target yarn from the viewpoint of quality and spinnability, and the latter is usually adopted in the present invention.

  As such a multifilament yarn, in addition to a one-step yarn such as a spin draw yarn, any two-step yarn obtained by drawing UDY (undrawn yarn), POY (highly oriented undrawn yarn) or the like can be used. . The number of filaments of the multifilament yarn is preferably 6 to 16, and more preferably 8 to 12. If the number of filaments is less than 6, the number of composite monofilament yarns that can be collected decreases, which is not preferable from the viewpoint of production efficiency. On the other hand, when the number exceeds 16, it is difficult to open the multifilament yarn, which tends to be disadvantageous in terms of the splitting operability.

  The total fineness of the multifilament yarn is preferably 50 to 480 dtex, and more preferably 100 to 300 dtex.

  The monofilament yarn of the present invention is mainly used for a thin fabric for organdy or the like, and is generally obtained by forming a woven fabric using the composite monofilament yarn and then splitting the composite monofilament yarn in the woven fabric with alkali. Of course, it is also possible to obtain the desired monofilament yarn by simply splitting the composite monofilament yarn without forming a woven fabric. However, when such a means is adopted, the monofilament yarn tends to be separated, which may cause various troubles in the fabric preparation process and the weaving process.

  The monofilament yarn thus obtained has a single yarn fineness in the range of 0.1 to 3.0 dtex, and does not have a crimp as a yarn shape, and forms a straight yarn shape. With such a configuration of the monofilament yarn, it is possible to implement a micro-touch soft texture that could not be expressed in the fabric. Further, since the refractive index of light incident on the fabric can be changed by making the yarn extremely fine, it is possible to suppress defects such as permbiquets that tend to occur in the split yarn.

  Here, in addition to the monofilament fineness of the monofilament yarn, if it is less than 0.1 dtex, the fineness of the composite monofilament yarn is also reduced accordingly, which may hinder the handling of the yarn. In addition, the sense of tightness is lost in the fabric texture. On the other hand, if it exceeds 3.0 dtex, a micro-touch texture cannot be realized in the fabric.

  Next, the present invention will be specifically described with reference to examples. In addition, the measurement of each physical property value was according to the following.

(1) Single yarn fineness of composite polyester monofilament yarn First, using a measuring machine having a frame circumference of 1.125 m, the composite monofilament yarn is about 200 m (frame circumference x 1) under a tension of 0.05 ± 0.01 cN / dtex. 178 times) Take up and use as a sample. Next, the mass of the cassette sample is measured using a balance (Electronic Balance manufactured by Kensei Kogyo Co., Ltd.) capable of measuring a 5-digit gram number below the comma, and the obtained numerical value is substituted into the following formula (1). . Measurement and calculation are performed once for each of the five packages, and the average of the calculated values is defined as the single yarn fineness (dtex) to be obtained.

(2) Hot water shrinkage rate of composite polyester monofilament yarn Measured according to JIS L1013 8.18.1 skein shrink method (A method).

(3) Single yarn fineness of polyester monofilament yarn First, using a measuring machine with a frame circumference of 1.125 m, the composite monofilament yarn was about 200 m (frame circumference × 178) under a tension of 0.05 ± 0.01 cN / dtex. Times) Take up and use casserole samples. Next, a casserole sample is put into an alkaline aqueous solution prepared to 20 g / L using a commercially available flake caustic soda at a bath ratio of 1:50, alkali split at 98 ° C. for 30 minutes, and dried overnight. Then, the mass of the monofilament yarn obtained using a balance (Electronic Balance manufactured by Kensei Kogyo Co., Ltd.) capable of measuring the number of grams of 5 digits below the comma is measured, and the obtained numerical value is expressed by the following formula (2). substitute. Measurement and calculation are performed once for each of the five packages, and the average of the calculated values is defined as the single yarn fineness (dtex) to be obtained.

Example 1
As polyester constituting the composite polyester monofilament yarn, PET is used for the monofilament (a), and 13.3% by mass of polyethylene glycol having a molecular weight of 6000 and 2.5 mol% of 5-sodium sulfoisophthalic acid are used for the binder (b). A PET copolymer PET containing as a polymerization component was applied.

  Then, both polyesters were composite-spun using ordinary means to obtain 120 dtex 10f polyester multifilament drawn yarn. At this time, the composite monofilament yarn constituting the multifilament yarn has a cross-sectional shape in which eight monofilaments (a) are bonded via the bonding agent (b) as shown in FIG. The ratio was (a) :( b) = 4: 1.

  Subsequently, the obtained multifilament yarn was put on a commercially available splitting device and split under the conditions of a splitting speed of 600 m / min, a delivery tension of 0.9 cN / dtex, and a take-up tension of 1.1 cN / dtex at the time of winding, Ten composite polyester monofilament yarns were obtained.

  The single yarn fineness of the obtained composite polyester monofilament yarn was 12.0 dtex, and the hot water shrinkage rate was 8.5%.

  Next, using this composite monofilament yarn as the warp and weft, weaving a plain fabric with a weft density of 126 pieces / 2.54 cm, scouring and splitting with alkali, and then high-pressure dyeing with black dye, Obtained.

  The resulting woven fabric was composed of monofilament yarns and had a micro-touch soft texture, and there were no defects such as Parnbike on the fabric surface. In addition, the monofilament fineness of the monofilament yarn was 1.2 dtex, and in order to observe the yarn form, the yarn was taken out from the fabric and observed with an optical microscope. As a result, the monofilament yarn had a linear form without crimps. Was confirmed.

(Comparative Example 1)
A polyester multifilament drawn yarn was obtained in the same manner as in Example 1 except that the fineness was changed to 120 dtex10f and 185 dtex5f. And this multifilament yarn was split into a composite polyester monofilament yarn. This composite monofilament yarn had a single yarn fineness of 37.0 dtex and a hot water shrinkage of 9.2%.

  Then, using this as the warp, weaving a plain woven fabric with a weft density of 75 / 2.54 cm, scouring and alkali splitting, and high-pressure dyed with black dye to obtain a woven fabric. Although this woven fabric was composed of monofilament yarns as in Example 1, the single yarn fineness of the yarns was as thick as 3.7 dtex, and did not exhibit a micro touch soft texture. Moreover, although it was slight, defects, such as Pambike, were confirmed on the fabric surface.

(Comparative Example 2)
A polyester multifilament drawn yarn was obtained in the same manner as in Example 1 except that the number of monofilaments (a) in the composite monofilament yarn was changed to 30 instead of 8, and the fineness was changed to 30 dtex10f instead of 120 dtex10f. And this multifilament yarn was split into a composite polyester monofilament yarn. The composite monofilament yarn had a single yarn fineness of 3.0 dtex and a hot water shrinkage of 8.5%.

  After that, weaving the plain weave with a weft density of 250 / 2.54 cm was used for the warp and weft. However, not only in the weaving process but also in the preparation stage, there were a few yarn breaks and some problems in terms of processability. Remained.

  After weaving, this was scoured, split into alkalis, and dyed at high pressure with black dye to obtain a woven fabric. As in Example 1, this woven fabric was composed of monofilament yarns, but the single yarn fineness of the yarns was as thin as 0.08 dtex, and the fabric was unsatisfactory as a texture. Further, on the fabric surface, no defects due to Pambique were confirmed, but some defects due to troubles in the fabric process could be confirmed.

It is a schematic diagram which shows an example of the cross-sectional shape of the composite polyester monofilament yarn used for this invention. It is a schematic diagram which shows an example of the cross-sectional shape of the polyester monofilament yarn of this invention.

Explanation of symbols

a Monofilament b Polyester-based bonding agent

Claims (3)

A woven fabric comprising monofilament yarns obtained by splitting a wedge-split composite polyethylene terephthalate multifilament yarn having a total fineness of 50 to 480 dtex and a single yarn fineness of 3.0 to 30.0 dtex , wherein the alkali of the monofilament yarn A thin fabric for organdy characterized by a single yarn fineness after splitting of 0.1 to 3.0 dtex and no crimp . 2. The thin fabric for organdy according to claim 1, wherein the wedge-divided composite polyethylene terephthalate multifilament yarn has 6 to 16 filaments. The thin fabric for organdy according to claim 1 or 2, wherein the number of divisions of the monofilament yarn is eight.