JPH0726275B2 - Carpet pile yarn - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a carpet pile yarn mainly composed of polyester filament yarn and made of a low crimped yarn having a large single fiber fineness and a yarn fineness. is there.

<Prior Art> Synthetic fibers have been generally used as pile yarns for carpets, and acrylic and nylon are generally used, but recently, polyester staples have been used as pile yarns for carpets. It has become. However, satisfactory carpets using polyester filament yarn as pile yarn have not yet been developed.

<Problems to be Solved by the Invention> The cause of the delay in the development of a carpet using filament-shaped polyester fibers is that the dyeability of the polyester fibers is poor. In order to make up for this drawback, a method is usually used in which yarn dyeing is performed at a high temperature of 130 ° C under a high pressure of 1.3 kg / cm ² G, but the inner and outer layers of the processed yarn filament wrapped in a package are used. It is difficult to obtain a good-quality carpet because the difference in dyeing and the difference in crimping form are observed, and the wound yarn filaments wound around the dregs have dullness and stains. In order to solve these problems and obtain a carpet with a better texture, the polyester-based processed yarn filament for the same purpose can be continuously steamed in a tension-free state before dyeing.
By heat-treating at 90-130 ° C, latent crimps are expressed in advance to give volume and form stabilization, and the morphology of the yarn in the dyeing process that is subsequently processed is stabilized. It is a well-known formula that the uniformity of dyeing can be secured. (This prescription will be referred to as pre-bulking.) In this process, the processed yarn filaments are 90 to 130 ° C in a continuous skein state so that they are folded without tension.
However, due to the crimp development during this heat treatment, the yarn is entangled and it is not possible to continuously wind it into the package. A possible problem arises.

The present inventor intends to solve these problems, that is, the problem that the yarn is entangled when pre-bulking is performed, and to develop a base yarn for a carpet pile pile yarn of a polyester processed yarn filament. The present invention has been found out through earnest studies.

<Means for Solving the Problems> That is, the present invention is a false twist textured yarn made of filament having a single fiber fineness of 7 denier or more, a crimping degree of 15% or less and a boiling water shrinkage rate of 4% or less, And the yarn torque is 30
A carpet pile yarn composed of a polyester low-crimp false-twisted yarn having a T / M or less.

The method for producing the false twisted yarn used for the carpet pile yarn of the present invention may be any means of false twisting as long as it has the above physical properties, but if one example is given, There is a method in which a highly oriented undrawn yarn spun at a spinning speed of 3000 to 4000 m / min is falsely twisted with a low speed indrow two-stage heater peg. As the false twist condition in this case, the false twist number is a normal level. Set to 50-90% of the (However, Dr is the yarn fineness after drawing, and DE is the breaking elongation of the undrawn yarn). The false twist set heat heater temperature is relatively low, preferably 200 ° C or lower, particularly 150 to 180
It is desirable that the temperature be stable to obtain a low crimp. Further, in order to satisfy the crimping characteristics required for the carpet, a high temperature heat treatment is performed at 200 ° C. or higher, preferably 230 to 250 ° C. with a second stage heater. At that time, the aux feed rate is preferably about 10%. Also, set the false twist speed to a lower value. By such a method, a false twist textured yarn having physical properties suitable for the carpet pile yarn of the present invention can be obtained.

The crimping degree (K ₁ value) in the present invention is measured by the following method. After winding the sample with a winder to a ridge of 5000 denier, suspend a load of 10 g at the center of the lower end of the ridge, fix this ridge at the center of the upper part, with a load of 0.001 g / d applied. 90 ° C
Hot water treatment for 30 minutes. Then, after leaving it to stand at room temperature without load and drying, a load of 10 g is applied again and the yarn length after standing for 5 minutes is measured, and this is defined as L ₁ (mm). Then 1k
Measure the yarn length after applying a load of g for 30 seconds and leave it L ₂ (mm)
And K ₁ is calculated by the following equation.

K ₁ (%) = {(L ₂ −L ₁ ) / L ₂ } × 100 Yarn torque is measured by the following method. Remove the sample from the package cage so that the unwound twist does not enter, 0.1 mg /
Under the load of d, make the sample length 100 cm, and remove the load of 0.1 mg / d to the center 50 cm, and then apply the load of 2 mg / d and hang it into a double-folded double thread. In this state, the yarn is left to stand until it stops turning, and the number of turns is measured by a twisting machine, and twice the value is taken as the yarn torque (T / m).

In order to be usable as a carpet pile yarn, the filament yarn is required to have a slight undulating crimp. Since the carpet using the filament yarn is dyed in a state of being wound on cheese or crepe or after being carpeted, it is required that the crimped state is not greatly changed under the dyeing condition. In order to meet such requirements, the polyester filament yarn must have a K ₁ value of 15% or less as measured by the above method. When the K ₁ value exceeds 15%, the crimpability is large, and the finished carpet becomes felt and becomes hard, which is completely unsuitable as a carpet pile yarn.
It is more preferably 5 to 10%. At the same time, the filament yarn must have a boiling water shrinkage of 4% or less. When the boiling water shrinkage exceeds 4%, the crimped state changes greatly under the dyeing condition, and the special low crimpability required for the pile yarn of the carpet cannot be maintained. More preferably, the boiling water shrinkage is 3% or less.

Furthermore, the yarn torque must be 30 T / m or less in order to stably perform pre-bulking. Even if K ₁ is 15% or less and boiling water shrinkage is 4% or less, yarn torque is 30 T / m
If it exceeds, the yarn is entangled when crimping occurs in the pre-bulk unwinding process, and subsequent winding is difficult, and it becomes substantially impossible to pre-bulk unwind. More preferably 20T / m
It is the following.

The present invention is intended for filament yarns used as carpet pile yarns. Therefore, the single fiber fineness is preferably 7dr or more, and particularly preferably 10 to 30dr. If it is less than 7dr, the pile will be stiff and cannot be used as a carpet.

The false twisted yarn having the physical properties shown in the present invention has a yarn fineness of about 1000.
~ 1600 Denier used as pile yarn in rear carpet.

Carpet pile yarns are required to be inconspicuous. The fibers constituting the filament yarn obtained from this point may have a round cross section, but have atypical cross sections such as a triangular cross section, a square cross section, a flat cross section, a U-shaped cross section, a V-shaped cross section, a W-shaped cross section, and a hollow cross section. It is preferable that the so-called bright polymer, which does not substantially contain a pigment typified by titanium oxide, is used as the polymer constituting the yarn.

Next, regarding dyeability, filament yarns that can be dyed under mild conditions without being dyed under severe conditions of high temperature and high pressure are preferable for carpets.

As described above, in the false twist textured yarn used for the carpet pile yarn of the present invention, since the low false twist number false twist is performed to obtain low crimpability, it is necessary to reduce the draw ratio because of the tension. As a result, the dyeability is naturally darkened and a desirable result is obtained, but it is difficult to improve the dyeability as much as dyeing under normal pressure. In order to improve this dyeability, it is preferable to modify the polyethylene terephthalate polymer. As a specific method thereof, a method using polyethylene phthalate obtained by copolymerizing sulfoisophthalic acid or the like can be mentioned.
The modification ratio of sulfoisophthalic acid is generally 2 mol% or more, and particularly preferably 3 to 5 mol%. It is possible to use a polybutylene terephthalate polymer instead of the polyethylene terephthalate polymer, but in that case, a temperature condition lower than the temperature condition specified by the method of the present invention must be adopted. With respect to the degree of darkening, a sulfoisophthalic acid-modified polyethylene terephthalate-based polymer has a great effect, and dispersion and anti-dyeing with both cationic dyes are possible.

The present invention is described above with reference to examples.

Example 1 Using a polyethylene terephthalate bright polymer obtained by a conventional method, a 420-denier undrawn yarn was wound at 3500 m / min, which was discharged from a Y-shaped heteromorphic 24-hole spinning nozzle. This unstretched yarn has a draw ratio of 1.40 (90% of the normal draw ratio), a false twist heat set temperature of 180 ° C, a winding number of 1600 T / m (normal twist ratio of 85
%) At 180 m / min, and then heat set by a second heater at a temperature of 240 ° C. and an overfeed rate of 10%.

As a result, K ₁ value 5%, boiling water shrinkage 3.5%, yarn torque 15T
/ M processed yarn was obtained.

The obtained processed yarn was combined with four yarns to give a yarn fineness of 1200 dr, and the yarn was pre-bulked out, and then cheese dyeing was carried out to obtain a carpet with a good texture and performance.

Example 2 A 3.8 mol% sulfoisophthalic acid-modified polyethylene terephthalate bright polymer obtained by a conventional method was used and discharged from a spinning nozzle having a cross-sectional shape Y-shaped variant 18 holes,
An undrawn yarn of denier was wound at 3600 m / min. This undrawn yarn has a draw ratio of 1.35 (85% of normal draw ratio), false twist heat set temperature of 160 ° C, twist number of 1750 T / m (80% of normal twist number), 160 m /
After drawing false twist in minutes, heat setting was performed with a second heater at a temperature of 240 ° C. and an overfeed rate of 10%.

As a result, K ₁ value 3.8%, boiling water shrinkage 3.0%, yarn torque 10
A processed yarn of T / m was obtained.

This processed yarn was combined with 8 yarns, yarn denier 1600 denier was applied to the first bulk, and loop type carpets were prepared and directly dyed. As a result, a carpet with good texture, dyeability and performance was obtained. Was obtained.

Comparative Example The undrawn yarn shown in Example 1 was drawn at a draw ratio of 1.40, a false twist heat set temperature of 180 ° C., a twist number of 1800 T / m, and a false twist of 180 m / min. The heat set with the second heater was performed in%.

As a result, K ₁ 17%, boiling water shrinkage rate 5.5%, yarn torque 55T
A processed yarn of / m was obtained.

When four of these processed yarns were combined and subjected to pre-bulking with a yarn fineness of 1200 denier, the yarns were entangled during winding and the winding was extremely poor.

When the wound yarn was dyed with cheese and tufted, it became a carpet with a felt-like appearance, which was unsuitable as a carpet.

 ─────────────────────────────────────────────────── --Continued from the front page (56) Reference JP 54-96141 (JP, A) JP 54-68431 (JP, A) JP 57-199825 (JP, A) JP 52- 85551 (JP, A) JP 56-79723 (JP, A) JP 1-52834 (JP, A) JP 56-5020 (JP, B2)

Claims (1)

[Claims] 1. A single fiber fineness of 7 denier or more and a crimping degree of 15
%, A carpet pile yarn with a yarn torque of 30 T / M or less, which is a false twisted yarn of polyester filament having a boiling water shrinkage of 4% or less.