JP3886583B2 - Polyester-based different shrinkage mixed yarn - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a polyester-based non-shrinkage mixed yarn in which a latent crimpable yarn and a spontaneously stretchable yarn are entangled. More specifically, if the yarn is knitted and woven and dyed, it is not only bulky but also soft. It is related to a polyester-based non-shrinkable mixed yarn that is excellent in resilience, elasticity, waist, and the like, and that can obtain a fabric free from color spots due to a dyeing difference between yarns constituting the mixed yarn, so-called irritating fabric. is there.
[0002]
[Prior art]
Different shrinkage mixed yarn is widely used as one of the methods for imparting a swell and bulkiness to a woven or knitted fabric. However, a general different shrinkage mixed yarn hardly exhibits a difference in shrinkage under the constraint of the woven or knitted fabric, and is still insufficient in terms of bulkiness.
[0003]
For this reason, recently, various different shrinkage mixed yarns using spontaneous stretch yarns as low shrinkage components have been proposed. If this blended yarn is used, the spontaneously stretchable yarn is elongated by the 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, the spontaneously stretchable yarn protrudes in a loop shape on the surface of the woven or knitted fabric and contributes greatly to the texture expression such as soft feeling, but hardly contributes to the texture such as elasticity, waist and resilience. In order to express these textures, it is necessary to rely on the characteristics of the high shrinkage component, and selection of a high shrinkage yarn is important.
[0004]
For this reason, for example, Japanese Patent Laid-Open No. 4-24234 discloses a blended yarn using a latently crimpable yarn as a high shrinkage component, thereby making the woven fabric soft, flexible and excellent in drapeability. It became possible to obtain a knitted fabric. However, this latent crimped yarn is only an example of a composite fiber in which a normal polyester and a polyester copolymerized with isophthalic acid are joined in a side-by-side manner. Although the drapeability can be improved by using sex yarn, the resilience, elasticity, and waist are not fully satisfactory.
[0005]
In addition, as a high-shrinkage yarn that is mixed with a spontaneously-extensible yarn to obtain a different-shrinkage mixed yarn, a yarn having a strong elongation characteristic similar to that of a drawn yarn in order to improve the form stability of the woven or knitted fabric. Need to use. However, the spontaneously stretchable yarn shows deep dyeability due to its internal structure, but the drawn yarn generally does not show deep dyeability, so if these are mixed into different shrinkage mixed yarn, There is a problem that the woven or knitted fabric is irritated due to a difference in dyeing property (coloring property difference) between constituent components, and the commercial value is remarkably lowered.
[0006]
[Problems to be solved by the invention]
The present invention solves the above-mentioned problems and is not only bulky but also excellent in softness, resilience, elasticity, waist and the like, and is free from irritation due to a difference in dyeing property between the yarns constituting the different shrinkage mixed yarn. An object of the present invention is to provide a polyester-based different shrinkage-mixed yarn capable of obtaining a woven or knitted fabric.
[0007]
[Means for Solving the Problems]
As a result of intensive studies to solve the above problems, the present inventors have reached the present invention.
That is, the present invention is a different shrinkage mixed yarn in which a heat-shrinkable latently crimped multifilament drawn yarn and a spontaneously stretchable multifilament yarn are entangled by an interlace method , and the number of entanglements is 20 to 100 / m, and the latently crimpable multifilament drawn yarn is bonded to a side-by-side type of two types of polyethylene terephthalate (hereinafter abbreviated as PET) whose intrinsic viscosity satisfies the following formulas (1) and (2) simultaneously. The gist of the present invention is a polyester-based non-shrinkage mixed yarn characterized by comprising a filament group and having a single yarn fineness of 2 to 10 d.
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 intrinsic viscosities (dl / g) of polyethylene terephthalate constituting the filament bonded to the side-by-side type.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail.
[0009]
The polyester-based different shrinkage mixed yarn of the present invention is a tangled crimped multifilament drawn yarn and a spontaneously stretchable multifilament yarn. First, a latent crimped multifilament drawn yarn ( Hereinafter, abbreviated as latent crimped yarn) will be described.
[0010]
This latent crimped yarn needs to be a multifilament drawn yarn composed of a filament group in which two kinds of PETs whose intrinsic viscosities simultaneously satisfy the expressions (1) and (2) are joined in a side-by-side manner.
Each filament constituting the latent crimped yarn is formed by joining two types of PET in the above range to a side-by-side type, so that the resilience, elasticity, and waist of the fabric obtained by weaving and knitting are markedly increased. Not only can it be improved, but also dyeability is improved compared to ordinary drawn yarns, and deep dyeing is possible. Will not occur.
[0011]
The reason why these characteristics are improved is not clear, but in order to achieve the object of the present invention, the intrinsic viscosity η ₁ of the low-viscosity PET is 0.35 to 0.55 dl / g, and the intrinsic viscosity of the high-viscosity PET is η ₂ is higher than 0.55 dl / g, and the difference between η ₂ and η ₁ needs to be 0.08 to 0.50 dl / g.
[0012]
If η ₁ is less than 0.35 dl / g, the viscosity is too low and spinning stability becomes poor.If it is higher than 0.55 dl / g, it becomes difficult to make a deep dyeing, and when it is combined with a spontaneously stretchable yarn, an irritating phenomenon occurs. Is likely to occur. On the other hand, when η ₂ of the high-viscosity PET is 0.55 dl / g or less, the strength of the latent crimped yarn is lowered, and yarn breakage and fluff are likely to occur, or spinning becomes difficult. Furthermore, if the difference between η ₂ and η ₁ is less than 0.08 dl / g, the difference in properties between the two types of PET becomes small, and the resilience, elasticity, and waist of the woven or knitted fabric cannot be improved, or irritation occurs. appear. On the other hand, if the difference between η ₂ and η ₁ is larger than 0.50 dl / g, the difference in viscosity is too large and stable spinning becomes difficult.
[0013]
Accordingly, the intrinsic viscosity of the two types of PET constituting the latent crimped yarn needs to be within the above range, and η ₁ is set to 0.4 to 0.4 when comprehensively considering the feel characteristics, irritability, spinning stability, and the like. 0.52 dl / g and η ₂ are preferably 0.6 to 0.8 dl / g, and the difference between η ₂ and η ₁ is preferably 0.1 to 0.35 dl / g.
[0014]
The PET referred to 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, and includes a catalyst, a matting agent, It may contain various additives such as antioxidants.
[0015]
Furthermore, the latent crimped yarn needs to be composed of a filament group in which two types of PET as described above are joined in a side-by-side manner. There is also a yarn obtained by compound spinning of two types of PET into an eccentric core-sheath type as a latent crimped yarn, but this latent crimped yarn is more repulsive, elastic and elastic than a side-by-side type. Since the improvement effect is small, it is necessary to use a side-by-side filament. In this case, the weight ratio between the low-viscosity PET and the high-viscosity PET is preferably in the range of 30:70 to 70:30 from the textured surface of the woven or knitted fabric.
[0016]
The latent 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 10d, preferably 2.5 to 6d, and is drawn. is there. When the single yarn fineness is less than 2d, the rebound, elasticity and waist of the woven / knitted fabric become insufficient, and when it exceeds 10d, the woven / knitted fabric becomes hard. Further, when the latent crimped yarn is not a drawn yarn, it is not preferable because the form of the woven or knitted fabric is easily deformed by an external force. The drawn yarn generally means a yarn spun and drawn by a conventional method, but in the present invention, not only such a yarn but also a yarn having a strong elongation characteristic similar to that of a drawn yarn is included. . That is, the drawn yarn in the present invention has heat shrinkability, strength of 1.5 g / d or more, elongation of 50% or less, and any manufacturing method as long as it satisfies the requirements of the present invention. What was obtained may be sufficient.
[0017]
For example, the latent crimped yarn is supplied to a side-by-side type composite spinning device while measuring two kinds of PET adjusted so that the intrinsic viscosity satisfies the above formulas (1) and (2). Therefore, it can be produced by spinning and drawing.
[0018]
Next, the spontaneously stretchable multifilament yarn (hereinafter abbreviated as spontaneously stretched yarn) that constitutes the different shrinkage mixed yarn of the present invention together with the latent crimped yarn will be described.
Spontaneous stretch yarn refers to a polyester multifilament yarn having a hot water shrinkage in boiling water or a dry heat shrinkage in dry heat of 100 to 180 ° C. of 0% or less. Therefore, any polyester multifilament yarn having such spontaneous elongation can be applied to the present invention without any particular limitation.
[0019]
Conventional spontaneous stretch yarns have both hot water shrinkage and dry heat shrinkage of 0% or less, hot water shrinkage is higher than 0%, and dry heat shrinkage at temperatures higher than 100 ° C is 0%. There are various spontaneous stretch yarns such as the following, and any of them can be used in the present invention. However, the following spontaneous stretch yarns are more preferable in order to fully express the bulkiness and softness of the woven or knitted fabric. That is, it is preferable to use a spontaneously stretched yarn that first spontaneously stretches by hot water treatment and then further spontaneously stretches when this hot water treated yarn is dry-heat treated at a temperature of 140 to 180 ° C. As a result, if the woven or knitted fabric using the different shrinkage mixed yarn of the present invention is heat-treated, the difference in yarn length between the latent crimped yarn and the spontaneously stretched yarn is increased, and the bulkiness and softness are excellent.
The hot water shrinkage rate and dry heat shrinkage rate of the spontaneously stretched yarn are not particularly limited, but if the spontaneous stretchability is too high, the knitted or knitted fabric has a feeling of wiping, so the hot water shrinkage rate is usually 0% to -5%, dry heat shrinkage is preferably in the range of -2% to -10%.
[0020]
In addition, the spontaneous stretch yarn may be formed of a filament group having a deformed cross-section, a hollow cross-section, or thick spots in the length direction. As a constituent polymer, PET and a copolyester mainly composed of PET are used. preferable. Since the spontaneously stretched yarn finally protrudes in a loop shape on the surface of the woven or knitted fabric, the single yarn fineness is preferably 5d or less, more preferably 3d or less, and particularly preferably 1.5d or less.
[0021]
The method for producing the spontaneously stretched yarn is not particularly limited. For example, the polyester highly oriented undrawn yarn obtained by high-speed spinning is stretched or can be produced by relaxing heat treatment at a high overfeed rate without stretching. it can.
[0022]
The different shrinkage blended yarn of the present invention is entangled between the above-described latently crimped yarn and spontaneously stretched yarn, and the number of entanglement is 20 to 100 / m in terms of process passability and quality of the woven or knitted fabric. preferable. In addition, as a method of entanglement, a general method in which latent crimped yarns and spontaneously stretched yarns are aligned and supplied to a commercially available interlace nozzle and entangled by the action of a high-pressure fluid can be employed. What is necessary is just to adjust suitably the overfeed rate at the time of a confounding process in the range of -1%-5%, and the supply pressure of a fluid in 0.5-8 kg / cm < ² >.
[0023]
【Example】
Next, the present invention will be specifically described with reference to examples. The intrinsic viscosity, hot water shrinkage and dry heat shrinkage were measured as follows.
1. It was measured at a temperature of 30 ° C. using an equal weight mixed solvent of intrinsic viscosity phenol and tetrachloroethane.
2. Hot water shrinkage rate Measured according to JIS-L-1090B method.
3. Dry heat shrinkage rate In the method of measuring the hot water shrinkage rate, instead of using boiling water, a dry heat oven was used and the temperature was measured at 180 ° C.
[0024]
Example 1
PET with intrinsic viscosity of 0.48 dl / g and PET with intrinsic viscosity of 0.65 dl / g are compound-spun into a side-by-side mold at a spinning speed of 3200 m / min at a weight ratio of 50:50, and then drawn to a latent capacity of 50d / 12f. A crimped yarn was obtained. The resulting crimped yarn had a strength of 3.2 g / d, an elongation of 24%, and a hot water shrinkage of 4.5%.
[0025]
On the other hand, PET highly oriented undrawn yarn obtained by spinning high-speed PET with intrinsic viscosity of 0.65 dl / g at a spinning speed of 3200 m / min, feed speed of 800 m / min, non-contact heater temperature of 500 ° C, overfeed rate A relaxation heat treatment was performed at 20% to obtain a spontaneously stretched yarn of 80 d / 96 f. The hot stretch shrinkage of the obtained spontaneously stretched yarn was -1.8%, and the dry heat shrinkage of the yarn after hot water treatment and air drying was -5.3%.
[0026]
Next, the latent crimped yarn and the spontaneously stretched yarn were aligned and subjected to entanglement treatment at a speed of 800 m / min to obtain a 133d / 108 f different shrinkage mixed yarn. Interlacing treatment conditions at this time were an interlace nozzle (type JD-1) manufactured by DuPont, an air pressure of 4 kg / cm ² , and an overfeed rate of 0.5%.
[0027]
A warp density of 112 yarns / 2.54 cm is obtained by using a twisted yarn of 350 T / M as a warp yarn and twisting two latent crimped yarns at 800 T / M as a weft yarn. A plain fabric with a weft density of 85 / 2.54cm was prototyped and subjected to the usual dyeing finishing process. As a result, an excellent fabric without bulkiness, softness, resilience, elasticity, waist and no irritability was obtained. It was.
[0028]
Example 2
PET with an intrinsic viscosity of 0.48 dl / g and PET with an intrinsic viscosity of 0.65 dl / g were compound-spun into a side-by-side type with a weight ratio of 50:50 and a spinning speed of 3200 m / min, and a highly oriented undrawn yarn A of 80 d / 24 f was obtained. Obtained. Further, PET having an intrinsic viscosity of 0.65 dl / g was spun at a high speed of 3200 m / min to obtain 66d / 72f highly oriented undrawn yarn B.
[0029]
Next, using a 2-feed type yarn processing machine, the highly oriented undrawn yarn A was drawn at a draw ratio of 1.5 times and a temperature of 180 ° C. to form a latent crimped yarn, while the highly oriented undrawn yarn B was made into a non-contact heater temperature. Relaxing heat treatment at 450 ° C and overfeed rate of 25% to make spontaneously stretched yarns, both yarns are continuously aligned, entangled under the same conditions as in Example 1, and 135d / 96f different shrinkage mixed yarn Got. In the above yarn processing, the highly oriented undrawn yarns A and B were each processed under the same conditions as described above without performing the entanglement treatment, and the latent crimped yarn and the spontaneously stretched yarn were collected independently. The strength of the compressed yarn is 3.1 g / d, the elongation is 28%, the hot water shrinkage is 4.7%, the hot water shrinkage of the spontaneously stretched yarn is -1.6%, and after hot water treatment and air drying The dry heat shrinkage of the yarn was -5.0%.
[0030]
Using the warp yarn obtained by twisting the obtained different shrinkage mixed fiber at 400 T / M, using the normal PET drawn yarn 100d / 36f obtained by ordinary methods at 1200 T / M as the weft yarn, A plain woven fabric with a warp density of 110 / 2.54cm and a weft density of 83 / 2.54cm was prototyped and subjected to normal dyeing finishing. It was bulky, soft, repellent, firm, and excellent in waist. A woven fabric without any was obtained.
[0031]
Comparative Examples 1 and 2
Composite spinning was performed in the same manner as in Example 2 except that the low-viscosity PET was changed to a PET having an intrinsic viscosity of 0.30 dl / g (Comparative Example 1). I could not get the article.
In addition, when composite spinning was performed using PET having intrinsic viscosities of 0.38 dl / g and 0.90 dl / g (Comparative Example 2), the spinning condition was poor and a yarn could not be obtained.
[0032]
Comparative Example 3
Except for changing the low-viscosity PET to PET having an intrinsic viscosity of 0.59 dl / g, a different shrinkage mixed yarn was obtained in the same manner as in Example 2, and then a woven fabric was produced as a prototype.
The obtained woven fabric was excellent in bulkiness and softness, but was slightly lacking in resilience, elasticity and waist, and an irritating phenomenon was also observed.
[0033]
【The invention's effect】
By knitting and weaving the polyester-based different shrinkage mixed yarn of the present invention, not only bulkiness but also soft feeling, resilience, elasticity, waist, etc., and dyeing between each yarn constituting the different shrinkage mixed yarn It becomes possible to obtain a fabric free from irritation due to a difference in wearability.

Claims (1)

A heat-shrinkable latently crimped multifilament drawn yarn and a spontaneously stretchable multifilament yarn entangled by an interlace method , wherein the number of entanglements is 20 to 100 / m, and the latent The crimped multifilament drawn yarn is composed of a group of filaments in which two types of polyethylene terephthalate whose intrinsic viscosity simultaneously satisfies the following formulas (1) and (2) are joined in a side-by-side manner, and the single yarn fineness is 2 to 10d. A polyester-based different shrinkage mixed yarn characterized by being.
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 intrinsic viscosities (dl / g) of polyethylene terephthalate constituting the filament bonded to the side-by-side type.