JPH08269842A - Polyester fabric and its production - Google Patents

Abstract

PURPOSE: To obtain a polyester fabric by making a polyester multifilament yarn comprising a filament having high fineness and a filament having low fineness arranged in a specific state into a fabric, not showing visible difference in light and shade and in color on the surface to make people get irritated, having a swollen feeling, tension, stiffness, etc. CONSTITUTION: The polyester-based multifilament yarn comprising filaments having high fineness of 2-8 denier and <=1 denier of a single yarn and a filament yarn having low fineness is made into a fabric. In the multifilament, the periphery of the filament having a high fineness is surrounded with a part of the filament having a low fineness to constitute a core filament and the rest of the filament having a low fineness has 5-30% slack based on the core filament bundle.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a polyester cloth and a method for producing the same. More specifically, the present invention relates to a polyester cloth having no unevenness on the surface of the cloth due to a difference in shading and a difference in color, having a uniform surface hue, and having a soft surface touch, a swelling feeling and a firmness, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, a method of mixing a plurality of yarns having different shrinkage characteristics or a mixture of a plurality of yarns having different finenesses has been used in order to impart a favorable feeling such as swelling, firmness and soft surface touch. Many proposals have been made regarding methods for making fibers and combinations thereof. For example, JP-A-1-306
Japanese Patent No. 643 discloses an example in which fibers having different shrinkage rates and single fiber fineness are used as a mixed yarn mixed yarn. In addition, JP-A-6
No. 2-170517 and Japanese Patent Laid-Open No. 63-126929 disclose an example in which a difference in shrinkage is applied to a plurality of yarns and then a mixed yarn is used, and Japanese Patent Laid-Open No. 62-268833 discloses a dyeing difference. An example of a mixed fiber having a is disclosed.

On the other hand, Japanese Unexamined Patent Publication No. Sho 49-72449 and Japanese Unexamined Patent Publication No. Sho 63-42913 disclose a technique for producing a mixed fiber in which a high shrinkage yarn and a low shrinkage yarn are spun from the same spinneret. ing.

When the above-mentioned conventional techniques are classified, a plurality of polymers are combined with a post-mixing method in which a plurality of polymers having different characteristics are used, or a multi-filament having a different fineness is mixed in an appropriate subsequent step. It can be roughly classified into a spinning and mixing method in which fibers are discharged from the same spinner using a spinning machine and mixed in a spinning process.

The former post-mixing method is capable of mixing filament yarns having various characteristics and has a high expressive power, but filaments having different characteristics have dyeability. In many cases, when the coating is not perfect, the difference in shade and the difference in color are visible, and defects of irregularity appear, and a great deal of effort is being made to improve them.

In the latter spinning mixed fiber method, a mixed fiber having a good covering property can be obtained by devising the arrangement of the spinneret holes, but it is possible to deal with various expressions of texture which have been particularly demanded in recent years. However, it was not possible to obtain a material satisfying the target cloth in the present invention.

[0007]

SUMMARY OF THE INVENTION The object of the present invention is to improve the above-mentioned drawbacks of the prior art and to prevent flicker on the surface of the fabric due to the difference in shade and the difference in color, to have a uniform surface hue, and to give a feeling of swelling. It is an object to provide a fabric having a tight and soft surface touch.

[0008]

To achieve the above object, the polyester cloth of the present invention has any of the following constitutions. That is, a fabric using polyester-based multifilament yarn, wherein the multifilament is composed of one large fineness filament having a single fiber fineness of 2 to 8 denier and a plurality of fine fineness filaments having a single fiber fineness of 1 denier or less, A part of the fine-fineness filament surrounds the periphery of the large-fineness filament to form a core filament bundle, and the rest of the fine-fineness filament is 5 relative to the core filament bundle.
A polyester cloth characterized by having a slack of -30%, or a cloth using a polyester-based multifilament yarn, wherein the multifilament is a single fine filament having a single fiber fineness of 2 to 8 denier and a large fineness. A core filament bundle in which four or more fine filaments having a single fiber fineness of 1 denier or less are arranged in a position surrounding the periphery of the filament, and 5 to 30% of the core filament bundle
It is a polyester cloth comprising a bundle of sheath filaments having a single fiber fineness of 1 denier or less and having slack.

The method for producing a polyester cloth of the present invention has the following constitution. That is, one large island component made of a low-solubility polymer, which becomes a filament having a single fiber fineness of 2 to 8 denier after the dissolution treatment, and a filament having a single fiber fineness of 1 denier or less after the dissolution treatment at a position surrounding the large island component. The sea-island type composite fiber in which four or more small island components and the sea component composed of a highly soluble polymer removed after the dissolution treatment are arranged is mixed with a sheath filament bundle having a single fiber fineness of 1 denier or less, and after forming a fabric, A method for producing a polyester fabric, wherein a highly soluble polymer is dissolved and removed, and a sheath filament bundle causes slack of 5 to 30% with respect to a core filament bundle.

Hereinafter, the present invention will be described in more detail.

The filament forming the core of the core-sheath mixed fiber composite yarn used in the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view showing an example of the sea-island type composite fiber used in the present invention. A is a large island component, B is a small island component, and C is a sea component. B is 9 in this figure
The individual components B are separated from each other by the sea component C and also separated from the large island component by the sea component.

The large island component in the sea-island type composite fiber is 1
The cross-sectional shape may be a round cross section, a flat cross section, or a multi-lobed cross section as shown in the figure.

Most of the large island component remains after the dissolution treatment and becomes a component of the core filament bundle. The monofilament fineness of the large fineness filament formed by separating large island components after the dissolution treatment has a close relationship with the tension of the texture surface,
In order to finish the fabric having an appropriate elasticity, the single fiber fineness is set in the range of 2 to 8 denier, preferably 3 to 7 denier. If it is less than 2 denier or more than 8 denier, the fabric will lose tension and become an abnormally hard fabric.

The number of small island components is important because it covers the surface of the filaments of large fineness, and is preferably 4 or more. When the number of island components B is 3 or less, the core component cannot be completely covered, and irregularities are likely to occur. The cross-sectional shape of the fineness filament formed by separating the small island component after the dissolution treatment may be a round cross section, a flat cross section, or a multi-lobed cross section as shown in the figure.

The fineness filaments of the fineness filaments formed by separating the small island components after the dissolution treatment have a difference in dyeing when the separately mixed sheath filaments are ultrafine filaments having a fineness of 1 denier or less. Easy to do, coat the core component,
From the viewpoint of covering the dye difference, the denier is set to 1 denier or less, preferably 0.9 denier or less, and it is more preferable to set the fineness to be the same as that of the sheath filament to be the fiber mixture.

The arrangement of the small island components in the sea-island type composite fiber may be one layer as shown in FIG. 1, but may be two layers as shown in FIG. 2, and if the number of small islands is increased in order to improve the coverage, it is 3 layers. It may be more than one layer. Here, interspersing small island components means that the island components are not in contact with each other, and the sea component is present between adjacent small island components.

As the polymer constituting the large island component and the small island component of the sea-island type composite fiber used in the present invention, a polyester polymer containing polyethylene terephthalate as a main component is used, and polyethylene terephthalate itself may be phthalic acid or isophthalate. A polyester obtained by copolymerizing an aromatic dicarboxylic acid such as an acid and an aliphatic diol such as diethylene glycol or triethylene glycol is also preferably used. Further, these may be used alone or may be a polyester copolymerized by combining a plurality of types of copolymerization components. The polymers forming the large island component and the small island component may be the same polymer or different polymers. For example, when the swelling of the fabric is emphasized, it is also preferable to dispose a polymer having a high shrinkage factor in a large island component and a polymer having a low shrinkage factor in a small island component.

The sea component has a higher solubility than the island component. When the sea component has a solubility lower than or equal to that of the island component, the island components cannot be separated from each other by the dissolution treatment.

From the viewpoint of preventing the island component from being remarkably increased in weight loss and melting a part of the constituent components, the alkali weight loss ratio is preferably 30 or more, more preferably 100 or more, and particularly preferably 500 or more.

Here, the alkali weight loss ratio will be described. Three kinds of filaments each having the same fineness and having a circular cross section, each consisting of a single polymer A, a polymer B and a polymer C, were added to a 3% aqueous sodium hydroxide solution at a bath ratio of 1: 125 and a temperature of 98.
After the treatment at -100 ° C. and the time required until the weight loss rate reaches 70%, t _A , t _B , and t _C are measured, the value obtained by the following equation is used as the alkali weight loss for polymer A and polymer B of polymer C. The ratio. Alkali Weight Loss Ratio of Polymer C to Polymer A = t _A / t _C Alkaline Weight Loss Ratio of Polymer C to Polymer B = t _B / t _C The weight loss rate is expressed by the following equation.

Weight loss rate (%) = {(weight before alkali treatment-weight after alkali treatment) / weight before alkali treatment} ×
As the 100 sea component polymer, an alkali, preferably a weak alkali such as a soda ash aqueous solution, and more preferably one having a solubility in hot water can be preferably used.

The polymer material constituting the sea-island composite fiber used in the present invention includes a matting agent, an antioxidant, a fluorescent whitening agent, a flame retardant, an ultraviolet absorber, etc. within a range that does not impair the effects of the present invention. It is also possible to contain known additives.

In the present invention, the filament constituting the sheath portion is an ultrafine yarn having a denier of 1 denier or less, preferably 0.9 denier or less. If it exceeds 1 denier, a soft surface touch cannot be imparted. Further, from the viewpoint of imparting a soft surface touch with a feeling of being caught on the hand and sliminess suppressed, 0.01 to 0.5 denier is particularly preferable.

As the polymer forming the sheath filament, it is preferable to use a polyester polymer containing polyethylene terephthalate as a main component. The sheath polymer of the present invention may contain well-known additives such as a matting agent and an antioxidant within a range that does not impair the effects of the present invention.

Examples of the method for mixing the sea-island type composite fiber and the sheath filament in the present invention include false twisting, fluid entanglement treatment, ply twisting treatment, or a combination thereof. Further, in order to impart a swelling feeling and a soft surface feeling, the sheath filament bundle should be 5 times larger than the core filament bundle.
It has a slack of -30%, preferably 10-20%. Incidentally, as a method of giving slack to the sheath filament bundle, at the time of mixing fibers, a method of giving an overfeed to the sheath filament bundle, a method of mixing and shrinking the sheath filament and the core filament as different shrinkage ratios, Alternatively, a combination thereof or the like is preferable.

The form of the cloth in the present invention is preferably a woven fabric, a knitted fabric or the like. It is also possible to interweave one or both of the warp yarn and the weft yarn of the woven fabric with a yarn other than the above-mentioned core-sheath type composite yarn, but in this case, a dyeing difference with the mating yarn is also expressed. It is preferable that the structure has a large amount of floating such as 5 pieces satin and covers the mating yarn. Similarly, in the case of a knitted fabric, yarns other than the core-sheath composite yarn may be used as a part of the plurality of yarns to be knitted, but it is preferable to give consideration in the same manner as the woven fabric.

[0028]

The present invention will be described below in detail with reference to examples.

(Examples 1 to 3, Comparative Example 1) Polyethylene terephthalate was used as the large island component A and the small island component B, and 10% by weight of 5-sodium sulfoisophthalate was used as the sea component C and polyethylene glycol having a molecular weight of 18,000. Polyethylene terephthalate containing 10% by weight and 10% by weight of dimethyl isophthalate was used,
The filament formed from the large island component A has a single fiber fineness of 5 denier, and the filament formed from the small island component B has a single fiber fineness of 0.4 denier and the small island component B.
The number of islands is 3, 4, 5, and 10, respectively, and the sea-island type composite yarn with a boiling water shrinkage rate of 17% and the polyethylene terephthalate multifilament of 30 denier-72 filaments with a boiling water shrinkage rate of 7% are twisted at 200 T / m. The mixed fiber core-sheath composite yarns were designated as G ₁ , G ₂ , G ₃ and G ₄ , respectively.

A polyethylene terephthalate multifilament yarn of 50 denier-18 filaments was used as a warp yarn, and the mixed yarns G ₁ , G ₂ , G ₃ , and G ₄ were used as weft yarns to form a fabric with five horizontal satin floats. The weaving properties were all very good. Then, after relaxing scouring, intermediate setting, and elution treatment of sea component C in a 1% strength caustic soda aqueous solution at 98 to 100 ° C. for 30 minutes, disperse dye Resoline Blue-FBL (Resoline Blue-FBL)
(Bayer) 2% owf was used for dyeing at 130 ° C. for 60 minutes, followed by drying and finishing setting. The sea component C of each fabric was completely eluted. The results of the obtained samples are shown in Table 1. G ₁ use of the fabric which is a comparative example 1 is tension, the waist was a bad thing of irritability occurs quality but was good.
Fabrics using G ₂ , G ₃ and G ₄ of Examples 1 to 3 are stretched,
As a result of observing with a scanning electron microscope, the fineness filament formed from the small island component B covers the large fineness filament formed from the large island component A, and the surface is free from flicker. It was an excellent fabric with a good surface.

[0031]

[Table 1] (Comparative Example 2) A 30 denier-6 filament with a boiling water shrinkage of 18% and a polyethylene terephthalate multifilament of 30 denier-72 filaments with a boiling water shrinkage of 7% were twisted together at 200 T / m to give G _5, and Example 1 Weaving dyeing was performed in the same manner as in. The results of the obtained samples are shown in Table 1.
It is also described. The obtained woven fabric had good tension and good elasticity, but was of poor quality due to irritability.

(Examples 4 to 6 and Comparative Examples 3 to 4) Polymers except that the monofilament fineness of the large fineness filaments formed from the large island component A are different from 2 denier, 3 denier, 7 denier and 8 denier respectively. In the same manner as in Example 1, except that the structure is the same as that of G ₃ , the mixed fiber core-sheath composite yarn G ₆ ,
_{G 7, G 8 (G 3} ), to give the G _9, G _10, was carried out weaving, finishing, the fabric evaluation. The results of the obtained samples are also shown in Table 1. The woven fabric using G ₆ of Comparative Example 3 has good surface quality without flicker, but it lacks tension and stiffness, and the woven fabric of G ₁₀ using Comparative Example 4 also has no flicker. The fabric had good surface quality, but was hard and had a core. G _{7 of} Examples 4 to 6,
Both G ₈ (G ₃ ) and G ₉ were excellent woven fabrics having a good surface with tension, waist and no flicker.

[0033]

The mixed fiber core-sheath composite yarn used in the present invention has both the high expressive power of the conventional post-fiber mixing system and the covering property of the spinning fiber mixing system, and the fabric of the present invention using the same While having a swelling feeling, firmness, and soft surface touch, it has the excellent properties of giving a uniform hue without flicker, with no visible differences in shade or different colors on the surface.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a preferred example of a sea-island type composite fiber which is a core component of a mixed fiber core-sheath composite yarn used in the present invention and before dissolution treatment.

FIG. 2 is a cross-sectional view showing another preferable example of the sea-island type composite fiber before the dissolution treatment.

Claims (3)

[Claims] 1. A fabric using polyester-based multifilament yarn, wherein the multifilament comprises one thick filament having a single fiber fineness of 2 to 8 denier and a plurality of fine filaments having a single fiber fineness of 1 denier or less. A part of the fineness filament surrounds the large fineness filament to form a core filament bundle, and the rest of the fineness filament is 5 to 3 with respect to the core filament bundle.
A polyester fabric characterized by having 0% slack. 2. A fabric using polyester-based multifilament yarns, wherein the multifilament has a single fine filament having a fineness of 2 to 8 denier and a single fineness of 1 denier at a position surrounding the fine filament. A polyester fabric comprising a core filament bundle in which four or more of the following fine-fineness filaments are arranged, and a sheath filament bundle having a single fiber fineness of 1 denier or less and having a slack of 5 to 30% with respect to the core filament bundle. 3. A single large island component made of a low-solubility polymer which becomes a filament having a single fiber fineness of 2 to 8 denier after the dissolution treatment and a single fiber fineness of 1 denier or less after the dissolution treatment at a position surrounding the large island component. A sea-island type composite fiber in which four or more small island components to be filaments and a sea component made of a highly soluble polymer to be removed after the dissolution treatment are arranged is mixed with a sheath filament bundle having a single fiber fineness of 1 denier or less, and a cloth is obtained. After the formation, the highly soluble polymer is dissolved and removed, and the sheath filament bundle causes a slack of 5 to 30% with respect to the core filament bundle.