JP5095556B2 - Latent crimped monofilament yarns and fabrics - Google Patents

Description

  The present invention relates to a so-called straight split yarn, and more particularly to a monofilament yarn having latent crimping performance.

  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 is advantageous in improving the color development, sharpness, strength and the like of the fabric.
JP-A-9-241923 JP-A-9-268432

  The organdy fabrics that have been proposed to date have excellent visual sensibility as described above, so that they can fully meet the demands of appearance in the curtain and bridal fields to which the fabrics belong. It was.

  However, with the diversification of consumer needs, there is an increasing tendency to place importance on stretchability and texture for textile products even in the above fields, and the same demand has been made for such organdy thin fabrics. . 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.

  An object of the present invention is to provide a monofilament yarn that is suitable for obtaining an unprecedented thin fabric, having a stretch property and excellent quality. .

  As a result of intensive studies to solve the above problems, the present inventors have found that if a monofilament yarn having crimps is used, it is advantageous in terms of obtaining a thin fabric having stretch properties, As a result of research, not only the crimp brought about by false twisting, but the crimp that manifests the latent crimp of the yarn itself greatly contributes to improving the stretchability of the fabric, and surprisingly, At the same time, it has been found that the fabric defects caused by Paanbique and the like can be greatly reduced, leading to the present invention.

That is, the gist of the present invention is as follows.
(1) Polyethylene terephthalate obtained by copolymerizing at least one of isophthalic acid, 5-sodium sulfoisophthalic acid, and 2,2-bis [4- (B-hydroxyethoxy) phenyl] propane, and a repeating unit Homopolyethylene terephthalate consisting essentially of ethylene terephthalate is bonded to the side-by-side type, the single yarn fineness is 3 to 30 dtex, the elongation is 30% or more, and the hot water shrinkage is 15% or less. Characteristic latent crimpable monofilament yarn .
(2) A woven fabric characterized by using the latently crimpable monofilament yarn described in (1) above as a warp and having a cover factor (CF) of 600 to 1200.

  In the present invention, by revealing the latent crimp possessed by the monofilament yarn, it is possible to realize stretch properties that could not be expressed in a thin fabric so far, and it is possible to change the refractive index of light incident on the fabric, It is possible to greatly suppress the fabric defects caused by permbique, which is often found in straight splitting yarns.

  Hereinafter, the present invention will be described in detail.

  The present invention is directed to monofilament yarns having latent crimp performance. The monofilament yarn of the present invention does not have the torque that a false twisted yarn normally has, and from this point, it can be said that it belongs to the category of straight split yarn.

  As the composition of the monofilament yarn, basically any one can be adopted except for the one that hinders the latent crimp characteristics. However, considering firstly the application of the monofilament yarn to a thin fabric for organdy, polyolefin, nylon, polyester and the like are preferable, and polyester is particularly preferable.

  The means for imparting latent crimp characteristics to the yarn is not particularly limited, but it is generally preferable to select and use two kinds of compositions having different heat shrink characteristics. In this respect, as described above, polyester is preferable as the composition of the monofilament yarn, and as a result, the monofilament yarn of the present invention is preferably composed of two kinds of polyesters having different heat shrinkage characteristics.

  The polyester used in the present invention is not particularly limited, and a conventionally known fiber-forming polyester polymer can be arbitrarily selected and used. Specifically, homopolyethylene terephthalate (hereinafter, abbreviated as PET) whose repeating units are substantially all ethylene terephthalate can be used. Also, copolymerized PET in which 85% or more of all repeating units are ethylene terephthalate and other components are copolymerized can be used. Examples of the copolymer component in such copolymerized PET include isophthalic acid, 5-sodium sulfoisophthalic acid, 2,2-bis {4- (β-hydroxyethoxy) phenyl} propane, and the like. In particular, it is preferable to use 5-sodium sulfoisophthalic acid as a copolymerization component because the monofilament yarn of the present invention becomes a cationic dyeable yarn and the commercial value is increased. In addition, polytrimethylene terephthalate, polytetramethylene terephthalate, and the like can also be used.

  In the present invention, two kinds of polyesters having different heat shrinkability properties are selected from the polyesters as mentioned above. In this regard, the two types of polymers may be the same type of polymer, for example, PET having different heat shrinkage characteristics may be used, and in this case, it can be said that these are two kinds of polyesters having different heat shrinkage characteristics. .

  Selecting two kinds of polyesters having different heat shrinkability from the same kind of polyester can be achieved by making the intrinsic viscosity different. For example, by selecting PET that has a difference of about 0.10 to 0.25 in intrinsic viscosity, a PET having a relatively low intrinsic viscosity is converted into a low heat-shrinkable polyester, and a PET having a high intrinsic viscosity. It can be used as a high heat shrinkable polyester.

  In addition, when different polyesters are used, even if the intrinsic viscosity is the same, the heat shrinkability may be different. Therefore, it is not always necessary to provide a difference in the intrinsic viscosity, and the high viscosity polyester may have a lower intrinsic viscosity than the other. sell. For example, a copolymer obtained by copolymerizing at least one of isophthalic acid, 5-sodium sulfoisophthalic acid, and 2,2-bis [4- (B-hydroxyethoxy) phenyl] propane as a high heat-shrinkable polyester When PET is used and a homo-PET polymer is used as the low heat-shrinkable polyester, since the thermal shrinkage rate of the copolymerized PET polymer is relatively high, the intrinsic viscosity of any polyester may be relatively high. Become. Specifically, in this case, as a high heat-shrinkable polyester, 5 to 10 mol% of isophthalic acid and 3 to 8 mol% of 2,2-bis [4- (B-hydroxyethoxy) phenyl] propane are copolymerized components. Copolymerized PET having a viscosity of 0.60 to 1.50 may be applied as PET having an intrinsic viscosity of 0.40 to 0.60 as the low heat-shrinkable polyester.

  In the present invention, it is preferable to select and use two kinds of predetermined polyesters as described above, and any form can be adopted as a joining form in the yarn. However, from the viewpoint of spinnability and quality stability, a side-by-side type or an eccentric core-sheath type is preferable, and a side-by-side type is more preferable.

  In addition, the monofilament fineness of the monofilament yarn is set to 3 to 30 dtex in consideration of the use and subsequent processes. When the fineness is less than 3 dtex, it becomes difficult to handle the yarn in the fabric preparation process and the weaving process, and the feeling of tension is lost even in the fabric texture. On the other hand, if it exceeds 30 dtex, the cooling effect at the time of spinning becomes poor, and as a result, problems may occur in the operation, such as easy fusion between the yarns, and there remains a problem in the splitting operability. Another problem remains in that the texture of the fabric is impaired.

  On the other hand, the physical properties of the monofilament yarn of the present invention are required to have an elongation rate of 30% or more. When the elongation rate is less than 30%, the crimp is not sufficiently developed, and the stretchability cannot be imparted to the woven fabric. In the present invention, the elongation rate is particularly preferably 40 to 80%.

  Moreover, it is necessary to satisfy 15% or less as the hot water shrinkage. When the hot water shrinkage rate exceeds 15%, the shrinkage force of the fabric becomes too strong. As a result, the fineness of the monofilament yarn is increased and the texture of the fabric is impaired. At the same time, the dimensional stability of the fabric is also lowered. In the present invention, the hot water shrinkage is particularly preferably 5 to 10%.

  In order to obtain a monofilament yarn having the above configuration, it is preferable to obtain it by directly spinning and drawing in consideration of cost. However, from the viewpoint of quality and spinnability, it is rather preferable to first obtain a multifilament yarn and then split it one by one to obtain the desired yarn. In the present invention, the latter is usually employed.

  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.

  As for the physical properties of the multifilament yarn, it is preferable that the elongation rate is 30% or more and the hot water shrinkage rate is 15% or less, considering the physical properties of the monofilament yarn obtained by splitting.

  In the present invention, the monofilament yarn is used to form a woven fabric, and then crimps are revealed by dyeing. The crimped form of the yarn is clearly different from that by false twisting, and forms a dense three-dimensional coil shape. In the present invention, since the yarn exhibits such a crimped shape, the fabric can be given good stretchability and at the same time, the refractive index of light incident on the fabric can be changed, so that the split yarn tends to be used. It is also possible to suppress disadvantages such as naive Panbique.

  The woven fabric may contain yarns other than the monofilament yarn as long as the object of the present invention is not impaired. Generally, from the viewpoint of realizing good stretch properties, the warp and weft yarns are also composed of the monofilament yarn. Is preferred.

  The cover factor (CF) of the woven fabric is preferably set to 600 to 1200. This is because if the CF is less than 500, misalignment or moire may occur on the fabric and the quality of the fabric may be impaired. On the other hand, if the CF exceeds 1200, the weave density becomes too high, This is because stretchability and texture may be impaired.

  Here, the cover factor (CF) refers to that after dyeing. Since the monofilament yarn is crimped together with heat shrinkage by the dyeing process, the CF after the dyeing process becomes larger than that before the dyeing process (in the raw machine stage). Since CF generally improves by about 5 to 20% through processing, if the CF in the raw machine stage is made appropriate with this point in mind, the CF can be naturally made desired.

  Such a woven fabric is suitable as a thin fabric for organdy, and exhibits an unprecedented ultrathin feeling and stretchability at the same time.

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

(1) Single yarn fineness First, using a measuring machine having a frame circumference of 1.125 m, the monofilament yarn was wound about 200 m (frame circumference × 178 times) under a tension of 0.05 ± 0.01 cN / dtex. A cassette sample is used. Next, the mass of the casserole sample is measured using a balance (Electronic Balance manufactured by Kensei Kogyo Co., Ltd.) capable of measuring the number of grams of 5 digits below the comma, and the obtained numerical value is substituted into the following formula. 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).

(2) Elongation rate First, using a measuring machine with a frame circumference of 1.125 m, take the yarn into a casserole under a tension of 0.05 ± 0.01 cN / dtex so that the total fineness is about 2500 dtex. put. Next, using an autoclave manufactured by Hirayama Mfg. Co., Ltd., the casserole is wet-heat treated at 130 ° C. for 30 minutes in a free state. Thereafter, a load of 0.2 cN / dtex is hung on the case, and the case length C is measured when left as it is for 10 seconds. Next, a load of 0.001 cN / dtex is hung instead of the load, and the sword length D is measured when left in that state for 10 minutes. Then, each obtained value is substituted into the following equation to calculate the height ratio.

(3) Hot water shrinkage rate Measured according to JIS L1013 8.18.1 skein shrinkage method (A method).

(4) Torque First, 200 cm of monofilament yarn is sampled under a tension of 0.0294 cN / dtex and used as a measurement sample. Next, the sample is suspended in a U shape from a pair of guides placed at an interval of 2 cm. Then, a load of 0.00294 cN / dtex is applied to the lower end of the lower end, a turn by the residual torque is generated in a free state, and the turn is left until it stops. Thereafter, the number of turns is measured by a twisting machine to obtain torque (T / M).

(5) Cover factor (CF)
The cover factor is calculated based on the following formula.

Example 1
As the high heat-shrinkable polyester, copolymerized PET having an intrinsic viscosity of 0.63 containing 8 mol% isophthalic acid and 5 mol% 2,2-bis [4- (B-hydroxyethoxy) phenyl] propane as a copolymerization component is used. PET having an intrinsic viscosity of 0.53 was used as the low heat shrinkable polyester.

  Then, both polyesters were combined and spun while side-by-side, and a 150 dtex 10f latent crimpable polyester multifilament drawn yarn was obtained. The resulting multifilament yarn had an elongation rate of 58% and a hot water shrinkage rate of 7%.

  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 latently crimpable monofilament yarns were obtained.

  The obtained monofilament yarn had a single yarn fineness of 15 dtex, an elongation rate of 43%, and a hot water shrinkage rate of 7.5%.

  Next, this monofilament yarn was used as a warp and a plain fabric was woven with a fabric density of 123 / 2.54 cm in the weft direction. Then, after scouring and relaxing this, drying, intermediate setting, and high-pressure dyeing with a black dye, a CF1047 thin fabric for organdy was obtained.

  The obtained woven fabric was composed of monofilament yarn and had a soft texture as well as stretchability. In addition, there were no defects such as Pambique on the fabric surface.

(Comparative Example 1)
A latent crimpable polyester multifilament drawn yarn was obtained in the same manner as in Example 1 except that the fineness of the multifilament yarn was changed to 360 dtex10f instead of 150 dtex10f. At this time, the elongation rate of the multifilament yarn was 30%, and the hot water shrinkage rate was 9.5%.

  The multifilament yarn was then split into a latent crimpable monofilament yarn. At this time, the monofilament fineness of the monofilament yarn was 36 dtex, the elongation rate was 35%, and the hot water shrinkage rate was 10%. However, in such a fiber separation process, there were troubles such as yarn breakage and fluff generation due to the lack of cooling effect when spinning the multifilament yarn.

  Thereafter, the obtained monofilament yarn was used as a warp and weft to weave a plain fabric with a fabric density of 110 yarns / 2.54 cm in the weft direction. And it dye-processed on the same conditions as Example 1, and obtained the textile fabric of CF1452. As in Example 1, this woven fabric was composed of monofilament yarns, but the yarn had a single yarn fineness of 36 dtex and lacked a soft feeling as a texture.

(Comparative Example 2)
A latent crimpable polyester multifilament drawn yarn was obtained in the same manner as in Example 1 except that the fineness of the multifilament yarn was changed to 25 dtex10f instead of 150 dtex10f. At this time, the elongation rate of the multifilament yarn was 32%, and the hot water shrinkage rate was 8.2%.

  The multifilament yarn was then split into a latent crimpable monofilament yarn. At this time, the single filament fineness of the monofilament yarn was 2.5 dtex, the elongation rate was 35%, and the hot water shrinkage rate was 8.7%.

  Thereafter, the obtained monofilament yarn was used as a warp and weft to weave a plain fabric with a fabric density of 180 / 2.54 cm in the weft direction. However, from the preparation stage as well as the weaving process, there were troubles related to process passability such as thread breakage.

Next, this was dyed and processed under the same conditions as in Example 1 to obtain a CF625 woven fabric. As in Example 1, this woven fabric was composed of monofilament yarn, but the single yarn fineness of the yarn was as thin as 2.5 dtex, and the texture was unsatisfactory. 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.

Claims (2)

Polyethylene terephthalate obtained by copolymerizing at least one of isophthalic acid, 5-sodiumsulfoisophthalic acid, and 2,2-bis [4- (B-hydroxyethoxy) phenyl] propane, and a substantial repeating unit. Homopolyethylene terephthalate consisting of ethylene terephthalate is bonded to the side-by-side type, the single yarn fineness is 3 to 30 dtex, the elongation is 30% or more, and the hot water shrinkage is 15% or less. Latent crimped monofilament yarn. A woven fabric comprising the latent crimpable monofilament yarn according to claim 1 as a warp and weft and having a cover factor (CF) of 600 to 1200.