JP3231665B2 - Composite false twisted yarn with built-in ring-shaped NEP expression ability - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite false twisted yarn having an inherent ability to develop a ring-shaped nep, and more particularly, to a ring design yarn conventionally manufactured from a design twisted yarn using a false twisting method. The present invention relates to a composite false twisted yarn which gives a ring-shaped nep comparable to the above.

[0002]

2. Description of the Related Art Conventionally, a ring design yarn uses a special design twisting machine, supplies three or more yarns to the twisting machine, and changes the size of each overfeed rate to form various types of ring. Manufactured design yarn. However, the production of a ring design yarn by a design twisting machine is low in productivity and expensive, and it cannot be said that the market needs are sufficiently satisfied.

On the other hand, various composite design yarns have also been proposed by composite false twisting. For example, Japanese Patent No. 255426
No. 2 discloses a composite false twisted yarn obtained by simultaneously twisting three or more multifilament yarns, the yarn being wound while forming a nep around a core yarn, and further around the yarn. A composite design yarn composed of a slab forming and winding yarn is disclosed. However, Patent No. 255
In the technology disclosed in Japanese Patent No. 4262, the size of the formed neps is small, and a slab is formed at the same time. Therefore, the shape of the ring design yarn is different from that of the ring design yarn, and the technology cannot be used for the ring design yarn. Things.

Further, another composite design yarn is disclosed in
JP-A-150433 discloses a triple wound structure formed of a presser yarn having a fineness of 20% or less of the whole fineness on the outer periphery of a composite yarn having a NEP loop formed by winding a sheath yarn on a core yarn. A composite design yarn in which a slab portion and a middle portion of a single wound structure are alternately repeated is disclosed.

However, in the composite design yarn disclosed in Japanese Patent Application Laid-Open No. 7-150433, what is referred to as a NEP loop is a knot portion having a length of 20 mm or less, and an interval between adjacent NEP loops is 50 mm. It refers to the following, but the form is different from the conventional ring design yarn, and the formed nep has a tightened structure and is substantially knotted, so it does not become a soft nep, and it is still a ring design It cannot be used for yarn applications.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above problems and provides a composite false twist processing in which a ring-shaped nep comparable to a conventional ring design yarn and a soft feeling and an excellent drapability developing ability are inherent. To provide yarn.

[0007]

According to the present invention, a core yarn,
In a composite false twisting yarn comprising a sheath yarn and a presser yarn, the core yarn and the presser yarn are thermoplastic synthetic fiber filament yarns, the sheath yarn is a cellulose fiber filament yarn, and the fineness of the presser yarn is the sheath yarn. The sheath yarn is not more than 50% of the fineness of the yarn, and the sheath yarn alternately forms a rigid winding structure and a loose winding structure around a core yarn, and is formed by a triple winding structure formed by the presser yarn. The composite false twisted yarn having a ring-shaped NEP-expressing ability inherent therein, characterized in that the winding of the sheath yarn is fixed by the portion and the single wound structure portion. A composite false twisted yarn obtained by subjecting a twisted yarn to a wet heat treatment, wherein a ring-shaped nep formed from the sheath yarn is present, and the apparent thickness of the yarn is at least twice as large as a portion where the ring-shaped nep is not present. Is the composite false twisting yarn 10cm
The present invention provides a composite false twisted yarn having a ring-shaped nep, wherein the number of the false false twist yarns is 5 or more.

FIG. 1 is a side view of a composite false twisted yarn of the present invention (claim 1). In FIG. 1, the sheath yarn 2 is wound around the core yarn 1 in a single layer, and the winding state is loose with the portion B where the sheath yarn is relatively firmly wound along the core yarn. And a portion A 'wound in a state.

The sheath yarn wound around the core yarn in this manner does not have a fixed structure as it is, but does not withstand the subsequent processing, and thus needs to be fixed with a presser yarn. The presser yarn alternately forms a single wound structure portion and a triple wound structure portion. In this case, in particular, the triple wound structure portion has a strong winding function, and thus has a function of reliably pressing the sheath yarn. One
The heavy wound structure portion also has a function of projecting the sheath yarn as a ring-shaped nep from between the wound pitches, while also performing the function of the presser yarn.

As the yarns forming the composite false twisted yarn of the present invention, filament yarns made of thermoplastic synthetic fibers are used as the core yarn and the holding yarn, and the thermoplastic synthetic fibers include polyester fibers and polyamide fibers. A filament yarn made of acrylic fiber or the like is used. Also, it is necessary to use a cellulose fiber filament yarn as the sheath yarn.

The thermoplastic synthetic fiber has a shrinkage (shrinkage when immersed in boiling water for 1 minute) of 5 to 50%.
Is preferable, and examples of the cellulosic fibers include those having an elongation ratio (elongation ratio when immersed in boiling water for 1 minute) of 1 to 3%.

The fineness (total denier) of each of the core yarn, sheath yarn and presser yarn constituting the composite false twisting yarn is 30.
~ 150de, 75 ~ 300de and 20 ~ 50de
Are preferred. Here, regarding the relationship between the fineness of each yarn, particularly, the fineness of the presser yarn needs to be 50% or less of the fineness of the sheath yarn, and particularly preferably 30% or less. When the fineness of the presser yarn exceeds 50% of the fineness of the sheath yarn, it becomes difficult to emphasize the ring-shaped nep formed by the sheath yarn, and it is not possible to obtain a soft false twisted yarn having a large drape property. . In order to easily form a ring-shaped nep, it is preferable that the fineness of each yarn be in the order of (fineness of the sheath yarn)> (fineness of the core yarn)> (fineness of the presser yarn). .

The composite false twisting yarn of the present invention can be produced by applying a conventionally known composite false twisting method. That is, the core yarn is supplied to the false twisting area at an overfeed rate (hereinafter, referred to as an OF rate) in the range of 0 to 10%, and when the sheath yarn is supplied to the core yarn in the false twisting area in close proximity, The supply of yarn is supplied to provide an OF rate of 50 to 150%, and the sheath yarn is wound around the core yarn. The winding is a form in which the sheath yarn is wound around the core yarn in a single layer in an alternately twisted manner, and the sheath yarn forms a triple wound structure portion or a multilayer wound structure portion exceeding the triple winding. Is not preferred. The alternately twisted winding structure tends to have a loose winding structure with respect to the core yarn at a reversal portion of the twist and at a portion wound by twisting in a direction opposite to the false twist direction.

[0014] Such a composite false twisting yarn can be produced using a known false twisting machine. That is, this is a false twisting machine having three or more feed rollers each of which can control the number of rotations, and supplies each yarn so that the number of rotations of the feed roller is within the above-mentioned range of the OF ratio. It is necessary to supply them in close proximity. Here, the proximity supply refers to supply by a guide provided close to the core yarn so that the sheath yarn does not reciprocate (traverse) along the core yarn. On the other hand, since the presser thread is traversed along the core thread, a guide for supplying the presser thread is provided at a position slightly away from the core thread.

The composite false twisted yarn thus obtained is
After that, it is subjected to wet heat treatment after being made into the form of a yarn or a fabric. Usually, the wet heat treatment is carried out in the steps of scouring, dyeing and finishing of the fabric, and changes from the form of FIG. 1 to a composite false twisted yarn having a ring-shaped nep as shown in FIG. .

In FIG. 2, the loosely wound structure portion A 'in FIG. 1 is shortened by the contraction of the core yarn 1, and forms a ring-shaped nep indicated by the wound structure portion A of FIG. The portion B is a relatively rigid wound structure portion, and the presser yarn 3 is wound from above the sheath yarn 2. The presser yarn 3 alternately forms a single-wound structure portion and a triple-wound structure portion (not shown), and both act as a presser for the sheath yarn 2.

There are various sizes of the above-mentioned ring-shaped nep, but the length is preferably 1 to 3 mm. In addition, there are at least 5 and preferably 5 to 20 pieces per 10 cm of the composite false twisted yarn having a size at least twice as large as the portion where no nep is present. A composite false twisted yarn having a ring-shaped nep that can be used for a design yarn is obtained.

If the number of ring-shaped neps is less than 5/10 cm, it is difficult to achieve the design effect of the ring-shaped neps. When the number of ring-shaped neps exceeds 20/10 cm, it may be difficult to form a large ring-shaped neps due to false twisting conditions, particularly the relationship with the overfeed rate.
The length of the ring-shaped nep portion is preferably about 1 to 3 mm from the viewpoint of the design effect.

In the composite false twisted yarn having a ring-shaped nep, the winding around the core yarn of the sheath yarn is fixed by the pressing yarn. At this time, the single-wound structure portion and the triple-wound structure portion are alternately formed by the presser yarn, and the triple-wound structure portion has an apparent thickness of one of the portions where the ring-shaped nep does not exist. 0.3 times or less, and does not substantially form a node. A yarn having a large knot portion is not preferable because it cannot be used as a composite false twisted yarn having a soft and large drapability and also impairs the design effect of a ring-shaped nep.

[0020]

The yarn of this form shrinks during the wet heat treatment due to the use of thermoplastic fibers for the core yarn and the presser yarn, while the sheath yarn is composed of cellulose fiber filament yarn, and thus is in a wet state. As a result, the ring-shaped nep portion formed by the sheath thread protrudes into the outer peripheral portion to form a larger ring-shaped nep, and at the same time, the core thread and the presser thread shrink. A nep-like composite false twisted yarn is obtained.

Furthermore, the fabric prepared using the composite false twisted yarn of the present invention can be soft and have a high drapability. This has a great effect by using cellulose fibers for the sheath yarn, but in some cases, the fabric is subjected to alkali weight reduction treatment in a range where the weight loss rate is within 10% (that is, in a range where the strength of the cellulose fibers is small). The application further promotes drapability.

[0022]

The present invention will be described in more detail with reference to the following examples. The apparent thickness of the ring-shaped nep of the composite false twisted yarn obtained in the example was measured by the following method. (1) Measurement of apparent thickness of ring-shaped nep Electron micrograph of composite false twisted yarn of sample (magnification: 60)
) Was taken over a continuous 10 cm, and the width of the portion where no nep was present in the photograph was measured as the apparent diameter (d ₁ ), and the apparent diameter of the portion of the ring-shaped nep having the maximum width (d ₁ ). The number of portions where d ₂ ) satisfies d ₂ / d ₁ ≧ 2 is measured.

Example 1 As a core yarn, a cationic dye dyeable polyester yarn (75 denier / 24 filament) copolymerized with 5-sodium sulfoisophthalic acid was used, and a cellulose fiber filament yarn (1) was used as a sheath yarn.
20 denier / 50 filaments), and a polyester yarn (30 denier / 12 filaments) made of polyethylene terephthalate as a presser yarn. The composite false twisting machine has an OF rate of 1%, a sheath yarn of a sheath yarn. OF 70
%, And the OF rate of the presser thread was 130%.

At the time of the supply, the sheath yarn is supplied in a close proximity so as not to traverse the sheath yarn.
m from a guide installed at a distance of 2 m, the number of false twists is 2180
The T / M and the temperature of the first heater and the second heater were both set to 200 ° C. as the heater temperature, and the false twisting was performed.

When the obtained composite false twisted yarn having the ability to develop a ring-shaped neps is treated with boiling water for 10 minutes, a ring-shaped neps as shown in FIG. 2 is obtained, and the ring-shaped neps have no nep. A composite false twisted yarn having a ring-shaped nep with an average value of eight per 10 cm having at least twice the size of the portion was obtained.

Further, using the composite false twisted yarn having a ring-shaped nep expression capability (before boiling water treatment), a density of 102 yarns / 3.79 cm and a weft density of 69 yarns / 3.79 c
woven into a 4/4 twill fabric at a density of m.
Dyed and finished. The obtained woven fabric had a ring-shaped nep, and had a drape property, a soft feel, and a moderate sharpness. Woven fabric was obtained.

Further, in order to carry out an alkali weight reduction treatment, the woven fabric is heated at a temperature of 9 g in an aqueous solution of 15 g / l sodium hydroxide.
The treatment was carried out at 8 ° C. for about 60 minutes so that the weight loss rate was 10%. The obtained woven fabric after the weight reduction treatment was able to further improve the drapability without impairing the design effect of the ring-shaped neps.

Comparative Example 1 A polyester yarn (120 denier / 50) made of polyethylene terephthalate was used instead of the cellulose fiber filament yarn used in Example 1.
Composite false twisting was performed in the same manner as in Example 1 except that a filament) was used. The composite false twisted yarn was treated with boiling water for 10 minutes. However, a large ring-shaped nep was not obtained, and a composite false-twisted yarn having a target ring-shaped nep was not obtained. Also, a 4/4 twill fabric was woven in the same manner as in Example 1, and was similarly scoured, dyed, and finished. The obtained fabric was not noticeable as a nep, and the texture was strong and the texture was not so soft.

[Brief description of the drawings]

FIG. 1 is a side view showing a wound state of a composite false twisted yarn (Claim 1) of the present invention.

FIG. 2 is a side view showing a wound state of the composite false twisted yarn (claim 2) of the present invention.

[Explanation of symbols]

1 is a core thread, 2 is a sheath thread, 3 is a presser thread, A is a ring-shaped nep portion, and B is a portion (ground portion) where no ring-shaped nep is present.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-7-150433 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) D02G 3/22-3/34

Claims (2)

(57) [Claims] 1. A composite false twisted yarn comprising a core yarn, a sheath yarn and a presser yarn, wherein the core yarn and the presser yarn are thermoplastic synthetic fiber filament yarns, and the sheath yarn is a cellulose fiber filament yarn. The fineness of the presser yarn is 50 times the fineness of the sheath yarn.
%, And the sheath yarn alternately forms a rigid wound structure and a loose wound structure around a core yarn, and comprises a triple wound structure portion formed by the presser yarn and a single wound structure. A composite false twisted yarn intrinsically capable of expressing a ring-shaped NEP, wherein the winding of the sheath yarn is fixed by a winding structure. 2. A composite false twisted yarn obtained by subjecting the composite false twisted yarn according to claim 1 to wet heat treatment, wherein a ring-shaped nep formed from the sheath yarn is present, and the apparent thickness thereof is 2. The composite false twisted yarn having a ring-shaped nep, characterized in that at least 5 double-threaded portions are present per 10 cm of the composite false twisted yarn.