JPH10219539A - Polyester-based combined yarn of different shrinkage filaments - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a polyester-based combined yarn of different shrinkage filaments capable of providing a woven or knitted fabric excellent in not only balkiness but also soft feeling, repulsion, body, stiffness, etc., hardly providing skitteriness by differences of dyeing properties between filaments constituting the combined yarn of different shrinkage filaments. SOLUTION: This polyester-based combined yarn of different shrinkage filaments is the combined yarn of different shrinkage filaments obtained by interlacing a heat shrinkable and latently shrinkable multifilament drown yarn with a self-extendable multifilament yarn. The latently shrinkable multifilament drawn yarn is composed of filament group of the filaments comprising combined two kinds of polyethylene terephthalates simultaneously satisfying the relations of the formula 0.35<=η1 <=0.555<=η2 and the formula 0.08<=η2 -η1 <=0.50 [η1 and η2 are each intrinsic viscosity (dl/g) of polyethylene terephthalates constituting filament with components adhered in a side-by-side type] and having 2-10d single fiber size.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester hetero-shrinkage mixed fiber in which latently crimpable yarn and spontaneously extensible yarn are entangled. Polyester type which is excellent not only in softness but also softness, resilience, firmness, waist, etc. and can obtain a fabric without color spots due to dyeing differences between the yarns constituting the mixed fiber, so-called irritation. It relates to a shrink-blend yarn.

[0002]

2. Description of the Related Art Different shrinkage mixed fiber yarns are widely used as one of techniques for imparting swelling and bulkiness to a woven or knitted fabric.
However, general different shrinkage mixed fiber yarns hardly develop a shrinkage difference under the constraint of the structure of the woven or knitted fabric, and are still insufficient in terms of bulkiness.

[0003] For this reason, recently, various shrinkage blended yarns using spontaneously extensible yarns as low shrinkage components have been proposed.
When this mixed fiber is used, the spontaneously extensible yarn is stretched by heat treatment in the dyeing process even under the constraint of the tissue, so that it is possible to impart sufficient bulkiness to the woven or knitted fabric. However, spontaneously extensible yarns protrude in a loop shape on the surface of the woven or knitted fabric and greatly contribute to a feeling expression such as soft feeling, but hardly contribute to a feeling such as firmness, waist and resilience, In order to express these feelings, it is necessary to rely on the characteristics of the high shrinkage component, and the selection of a high shrinkage yarn is important.

[0004] For this reason, for example, Japanese Patent Application Laid-Open No. Hei 4-24234 discloses a mixed fiber using a latently crimpable yarn as a high shrinkage component, thereby providing a soft, flexible and drapable material. It has become possible to obtain an excellent woven or knitted fabric. However, with respect to this latently crimpable yarn, only examples of composite fibers in which a normal polyester and a polyester obtained by copolymerizing isophthalic acid are joined in a side-by-side type are shown, and such a latently crimped yarn is shown. Although the drape property can be improved by using a soft yarn, the resilience, firmness, and waist were not sufficiently satisfactory.

A highly shrinkable yarn which is mixed with a spontaneously extensible yarn to form a different shrinkage mixed yarn has a high elongation characteristic comparable to that of a drawn yarn in order to improve the form stability of a woven or knitted fabric. It is necessary to use the yarn which has. However, spontaneously extensible yarns show deep dyeing due to their internal structure, but drawn yarns generally do not show deep dyeing, so if these are mixed to form a different shrink mixed yarn, Irregularities occur in the woven or knitted fabric due to differences in dyeing properties (differences in coloring properties) of the constituent components, and there is a problem that the commercial value is significantly reduced.

[0006]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems, and is excellent not only in bulkiness but also in softness, resilience, firmness, waist and the like, and furthermore, each yarn constituting a different shrinkage mixed fiber yarn. An object of the present invention is to provide a polyester-based different shrinkage mixed fiber yarn capable of obtaining a woven or knitted fabric free from irritability due to a difference in dyeability between the yarns.

[0007]

Means for Solving the Problems The present inventors have made intensive studies to solve the above-mentioned problems, and as a result, have reached the present invention. That is, the present invention is a different shrinkage mixed fiber yarn in which a heat-shrinkable latently crimped multifilament drawn yarn and a spontaneously extensible multifilament yarn are entangled, and the latently crimpable multifilament drawn yarn is Two kinds of polyethylene terephthalate (hereinafter abbreviated as PET) whose intrinsic viscosity simultaneously satisfies the following formulas (1) and (2) are composed of a filament group joined in a side-by-side type, and have a single-fiber fineness of 2 to 10 d. The present invention provides a polyester-based different shrinkage mixed fiber yarn characterized by the following. 0.35 ≦ η ₁ ≦ 0.55 <η ₂ (1) 0.08 ≦ η ₂ −η ₁ ≦ 0.50 (2) where η ₁ and η ₂ are the intrinsic viscosities of PET constituting the side-by-side type filaments ( dl
/ g).

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.

[0009] The polyester hetero-shrinkage mixed fiber yarn of the present invention comprises:
The latently crimped multifilament drawn yarn and the spontaneously extensible multifilament yarn are entangled. First, the latently crimped multifilament drawn yarn (hereinafter abbreviated as latently crimped yarn). explain.

This latent crimped yarn has an intrinsic viscosity of the above formula (1)
It is necessary that the two types of PET satisfying both (2) and (4) be a multifilament drawn yarn comprising a group of filaments joined side-by-side. Each filament constituting the latent crimped yarn is composed of two types of PET in the above range.
Is bonded to the side-by-side type, so that the resilience, firmness and waist of the fabric obtained by knitting and weaving can be remarkably improved, as well as the dyeability as compared with a normal drawn yarn. Is improved, and deep dyeing becomes possible, so that the problem of irritation does not occur even when the yarn is combined with a spontaneously extensible yarn having deep dyeability.

The reason why these properties are improved is not clear, but in order to achieve the object of the present invention, the P of the low viscosity side is required.
ET intrinsic viscosity η ₁ is 0.35-0.55 dl / g, high viscosity side PE
The intrinsic viscosity η _{2 of} T is higher than 0.55 dl / g and η ₂ and η
The difference from ₁ needs to be 0.08 to 0.50 dl / g.

When η ₁ is less than 0.35 dl / g, the viscosity is too low, resulting in poor spinning stability, and when η ₁ is more than 0.55 dl / g, it becomes difficult to make deep dyeing, and when it is compounded with spontaneously extensible yarn. Irritability phenomenon easily occurs. Also, high viscosity PET
When the eta ₂ is below 0.55 dl / g, or latent crimp yarn strength is reduced yarn breakage or fluff is liable to occur, or spinning becomes difficult. Further, when the difference between η ₂ and η ₁ is less than 0.08 dl / g, the difference in properties between the two PETs becomes smaller, and the resilience, firmness, and waist of the woven or knitted fabric cannot be improved, or irritation is caused. Occur. Also, the difference between η ₂ and η ₁ is 0.50
If it is larger than dl / g, the difference in viscosity is too large and stable spinning becomes difficult.

Therefore, it is necessary that the intrinsic viscosities of the two types of PET constituting the latently crimped yarn are within the above-mentioned range. Considering the feeling characteristics, irritability and spinning stability, η ₁ the 0.4~0.52dl / g, η ₂ is 0.6~0.8dl / g
, Η ₂ and η ₁ are preferably 0.1 to 0.35 dl / g.

The PET in the present invention is produced by a conventional method, and may be one in which diethylene glycol or the like produced by a side reaction during the polycondensation reaction is copolymerized in the PET main chain. It may contain various additives such as a disinfectant and an antioxidant.

Further, the latently crimped yarn needs to be composed of a filament group in which the above two kinds of PET are joined in a side-by-side type. As a latently crimped yarn, there is also a yarn obtained by compound spinning two types of PET into an eccentric core-sheath type, but this latently crimped yarn is more resilient, stiffer, and stiffer than a side-by-side type. Since the improvement effect is small, it is necessary to use a side-by-side type filament. In this case, the low viscosity side PET and the high viscosity side PET
Is preferably in the range of 30:70 to 70:30 from the viewpoint of the texture of the woven or knitted fabric.

The latently crimped yarn in the present invention is composed of the filament group as described above, and each filament has a fineness (single yarn fineness) of 2 to 10 d, preferably 2.5 to 6 d.
And stretched. When the single yarn fineness is less than 2d, the resilience, firmness and waist of the woven or knitted fabric become insufficient, and when it exceeds 10d, the woven or knitted fabric becomes hard. Further, when the latent crimped yarn is not a drawn yarn, the form of the woven or knitted fabric is easily deformed by an external force, which is not preferable. What is drawn yarn?
Generally, it refers to a yarn spun and drawn by an ordinary method, but the present invention includes not only such a yarn but also a yarn having a high elongation property comparable to that of a drawn yarn. That is, the drawn yarn in the present invention has heat shrinkability, a strength of 1.5 g / d or more, an elongation of 50% or less, and any production method that satisfies the requirements of the present invention. It may be obtained.

The latent crimped yarn is, for example, two kinds of PEs whose intrinsic viscosity is adjusted so as to satisfy the above formulas (1) and (2).
It can be manufactured by supplying T to a side-by-side type composite spinning device while weighing each, spinning and stretching according to a conventional method.

Next, the spontaneously extensible multifilament yarn (hereinafter, abbreviated as spontaneously elongated yarn) constituting the hetero-shrinkage mixed fiber yarn of the present invention together with the latent crimped yarn will be described.
A spontaneously elongated yarn is a hot water shrinkage in boiling water, or 100 to
A polyester multifilament yarn having a dry heat shrinkage of 0% or less at 180 ° C. in dry heat. Therefore, any polyester multifilament yarn having such spontaneous extensibility can be applied to the present invention without any particular limitation.

Conventional spontaneous elongation yarns have a hot water shrinkage and a dry heat shrinkage of 0% or less, and a hot water shrinkage higher than 0% and a dry heat shrinkage at a temperature higher than 100 ° C. There are various spontaneously elongated yarns such as 0% or less, and any of them can be employed in the present invention. However, in order to sufficiently express bulkiness and softness in a woven or knitted fabric, the following spontaneously elongated yarns are used. More preferred. That is, first, spontaneous elongation by hot water treatment,
Next, a spontaneously elongated yarn which further elongates spontaneously when the hot water treated yarn is subjected to dry heat treatment at a temperature of 140 to 180 ° C is preferred. Thereby, if the woven or knitted fabric using the different shrinkage mixed fiber of the present invention is subjected to heat treatment, the difference in yarn length between the latently crimped yarn and the spontaneously elongated yarn becomes large, and the bulkiness and softness are improved. The hot water shrinkage and the dry heat shrinkage of the spontaneously elongated yarn are not particularly limited. However, if the spontaneous elongation is too high, the woven or knitted fabric will have a feeling of flapping. -5% and the dry heat shrinkage are preferably in the range of -2% to -10%.

Further, the spontaneously elongated yarn may be composed of a filament group having an irregular cross section, a hollow cross section, or a thick and thin spot in the length direction.
PET and copolymerized polyester mainly composed of PET are preferred. Since the spontaneously elongated yarn finally projects in a loop on the surface of the woven or knitted fabric, its single yarn fineness is preferably 5%.
d or less, more preferably 3d or less, particularly preferably 1.5d or less.

The method for producing the spontaneously elongated yarn is not particularly limited. For example, it is produced by stretching a polyester highly oriented undrawn yarn obtained by high-speed spinning or by performing a relaxation heat treatment at a high overfeed rate without stretching. can do.

The hetero-shrinkage blended yarn of the present invention is obtained by interlacing the latently crimped yarn and the spontaneously elongated yarn. The number of interlaced yarns is 20 to 100 from the viewpoint of processability and the quality of the woven or knitted fabric. / M
Is preferred. In addition, as a method of entanglement, a general method in which latent crimped yarn and spontaneously elongated yarn are supplied to a commercially available interlace nozzle in a state where they are aligned, and entangled by the action of a high-pressure fluid can be adopted. The overfeed rate during confounding processing is -1% to 5%, and the fluid supply pressure is 0.5 to
It may be adjusted appropriately within the range of 8 kg / cm ² .

[0023]

Next, the present invention will be described in detail with reference to examples. The intrinsic viscosity, hot water shrinkage and dry heat shrinkage were measured as follows. 1. Intrinsic viscosity The viscosity was measured at a temperature of 30 ° C. using an equal weight mixed solvent of phenol and tetrachloroethane. 2. Hot water shrinkage rate Measured in accordance with JIS-L-1090B method. 3. Dry heat shrinkage The hot water shrinkage was measured at a temperature of 180 ° C using a dry heat oven instead of boiling water.

Example 1 PET having an intrinsic viscosity of 0.48 dl / g and P having an intrinsic viscosity of 0.65 dl / g
By spinning the composite spin in a side-by-side type at a spinning speed of 3200 m / min with an ET weight ratio of 50:50, and then drawing
A latently crimped yarn of 50d / 12f was obtained. The resulting latent crimped yarn had a strength of 3.2 g / d, an elongation of 24%, and a hot water shrinkage of 4.5%.
Met.

On the other hand, a PET highly oriented undrawn yarn obtained by spinning PET having an intrinsic viscosity of 0.65 dl / g at a spinning speed of 3200 m / min is supplied at a feed speed of 800 m / min and a non-contact heater temperature of 5 mm.
Relaxation heat treatment at 00 ° C, overfeed rate 20%, 80d /
A spontaneously elongated yarn of 96f was obtained. The hot water shrinkage of the obtained spontaneously elongated yarn was -1.8%, and the dry heat shrinkage of the yarn after hot water treatment and air drying was -5.3%.

Next, the latently crimped yarn and the spontaneously elongated yarn are aligned and subjected to a confounding treatment at a speed of 800 m / min to obtain 133 d /
108 f of different shrinkage mixed fiber was obtained. The confounding processing conditions at this time are an interlace nozzle manufactured by DuPont (type JD
-1), air pressure 4 kg / cm ² , overfeed rate
0.5%.

The obtained different shrinkage mixed fiber yarn was twisted at 350 T / M into a warp yarn, and the two latently crimped yarns were twisted at 800 T / M into a weft, and the warp density was 112 yarns. /2.54c
m, a plain woven fabric with a weft density of 85 yarns / 2.54 cm, and a normal dyeing process was performed. An excellent woven fabric with excellent bulkiness, softness, resilience, firmness, waist, and no irritation was obtained. Obtained.

Example 2 PET having an intrinsic viscosity of 0.48 dl / g and P having an intrinsic viscosity of 0.65 dl / g
Composite spinning was performed in a side-by-side manner at a spinning speed of 3200 m / min with an ET weight ratio of 50:50 to obtain a highly oriented undrawn yarn A of 80 d / 24f. In addition, PET having an intrinsic viscosity of 0.65 dl / g was spun at a spinning speed of 3200 m / min to obtain a 66d / 72f highly oriented undrawn yarn B.

Next, using a two-feed type yarn processing machine, the highly oriented undrawn yarn A is drawn at a draw ratio of 1.5 times at a temperature of 180 ° C. to form a latent crimped yarn. A relaxation heat treatment was performed at a contact heater temperature of 450 ° C. and an overfeed rate of 25% to form a spontaneously elongated yarn. Both yarns were continuously aligned and entangled under the same conditions as in Example 1 to 135 d /
A 96f different shrinkage mixed fiber was obtained. In the above-mentioned yarn processing, the highly oriented undrawn yarns A and B were each processed under the same conditions as above without performing the entanglement treatment, and the latently crimped yarn and the spontaneously elongated yarn were individually collected. The strength of the crimp is 3.
1g / d, elongation 28%, hot water shrinkage 4.7%, spontaneously stretched yarn hot water shrinkage -1.6%, and dry heat shrinkage of yarn after hot water treatment and air drying The rate was -5.0%.

A normal PET drawn yarn obtained by an ordinary method is used as a warp yarn obtained by twisting the obtained different shrinkage mixed fiber yarn at 400 T / M.
Using 100d / 36f twisted at 1200T / M for the weft,
Trial production of a plain woven fabric with a warp density of 110 yarns / 2.54 cm and a weft yarn density of 83 yarns / 2.54 cm, and the usual dyeing and finishing process, showed excellent bulkiness, softness, resilience, firmness, waist, and irritability. A non-woven fabric was obtained.

Comparative Examples 1 and 2 Composite spinning was performed in the same manner as in Example 2 except that the PET on the low viscosity side was changed to PET having an intrinsic viscosity of 0.30 dl / g (Comparative Example 1). The condition was poor and the yarn could not be stably obtained. In addition, the limiting viscosity is 0.38 dl / g and 0.
Composite spinning was performed using 90 dl / g PET (Comparative Example 2).
Also in this case, the spinning condition was poor, and no yarn could be obtained.

Comparative Example 3 A non-shrinkable mixed yarn was obtained in the same manner as in Example 2 except that the PET on the low viscosity side was changed to PET with an intrinsic viscosity of 0.59 dl / g, and a woven fabric was produced as a trial. The resulting woven fabric was excellent in bulkiness and softness, but lacked resilience, firmness, and waist, and also exhibited an irritation phenomenon.

[0033]

The knitting and weaving of the polyester hetero-shrink mixed yarn of the present invention is not only excellent in bulkiness but also excellent in softness, resilience, firmness, waist, etc. It is possible to obtain a fabric free from irritation due to a difference in dyeing properties between yarns.

Claims (1)

[Claims] A heat-shrinkable latently crimped multifilament stretched yarn and a spontaneously extensible multifilament yarn are entangled in a different shrinkage blended yarn, wherein the latently crimpable multifilament stretched yarn is the ultimate. The two kinds of polyethylene terephthalate whose viscosity simultaneously satisfies the following formulas (1) and (2) are composed of a filament group joined in a side-by-side type,
A polyester hetero-shrink mixed yarn having a single yarn fineness of 2 to 10d. 0.35 ≦ η ₁ ≦ 0.55 <η ₂ (1) 0.08 ≦ η ₂ −η ₁ ≦ 0.50 (2) Here, η ₁ and η ₂ are the intrinsic viscosities of the polyethylene terephthalate constituting the filament joined in the side-by-side type. (Dl / g).