JPH01306635A - False twisted textured yarn suitable for carpet - Google Patents

Abstract

PURPOSE:To obtain the subject false twisted textured yarn having excellent feeling and properties without generating interlace of yarn after projecting of end bulk, comprising filament polyester fibers having large sizes of both of single fiber size and yarn size. CONSTITUTION:Filament yarn having at least 7 denier of single fiber size, preferably 10-30 denier is false twisted, by for instance, in-draw of pegged two stage heaters at a draw ratio of [(DE+100)/100]X(0.60-0.80) to obtain the aimed false twisted textured yarn having <=15% curliness, <=4% shrinkage in boiling water and <=30 T/M yarn torque.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a low-crimp processed yarn with thick single fiber fineness and yarn fineness, and particularly to carpet pile yarn mainly composed of polyester fibers. The present invention relates to filament yarn suitable for various uses.

<Prior art> Synthetic fibers have traditionally been used as pile yarns for carpets, with acrylic and nylon being commonly used, but recently polyester stable has been used as pile yarns for carpets. It has become possible to do so. However, a satisfactory pile carpet made of polyester filament yarn has not yet been developed.

<Problems to be Solved by the Invention> One of the reasons for the delay in the development of carpets using filamentary polyester fibers is the poor dyeability of polyester fibers.

In order to compensate for this drawback, normally, for example, 1.3 kg/C
Although yarn dyeing is carried out at a high temperature of 130°C under high pressure of Il''G, there are cases where differences in dyeing and differences in crimp shape are observed between the inner and outer layers of the processed yarn filament wound into a package. It is difficult to obtain a carpet with good quality due to the occurrence of gross wrinkles and dyeing spots in the processed yarn filaments wound on the carpet.In order to solve these problems and obtain a carpet with even better texture, we have developed polyester processed yarn filaments for the same purpose. Before dyeing the yarn, it is heat-treated continuously with steam at 90 to 130 degrees Celsius in a stress-free state to develop latent crimp in advance, giving it volume and stabilizing its shape. The shape of the yarn is stabilized during the subsequent dyeing process,
Furthermore, it is a well-known recipe that uniformity of dyeing can be ensured. (This prescription will be referred to as pre-bulking.

) In this process, the processed yarn filaments are heat-treated at 90 to 130°C in a continuous skein so as to fold over each other without tension, and are then continuously wound up into packages. Depending on how the crimp occurs, the yarn may become tangled, making it impossible to wind it continuously into a package.

The present inventor has conducted intensive studies to solve these problems, namely, the problem that yarn entanglement occurs when bulking is performed, and to develop a raw yarn for carpet pile yarn of polyester processed yarn filament. and discovered the present invention.

In other words, the present invention provides a false twisted yarn consisting of filaments with a single fiber fineness of 7 deniers or more, and a crimp degree of 15%.
This is a low crimp polyester false twisted yarn suitable for carpets, characterized by having a water shrinkage rate of 4% or less and a yarn torque of 30T/M or less.

The method for producing the false twisted yarn of the present invention may be any method of false twisting as long as it has the above-mentioned physical properties; for example, 3000-4000 II
Highly oriented undrawn yarn spun at a spinning speed of 1/min is false-twisted with a low-speed in-draw two-stage heater peg ((1,6Q to 0.
80) (where Dr is the yarn fineness after drawing,
DE is the elongation at break of the undrawn yarn).

In addition, the temperature of the false twist set thermal heater is relatively low, 200°
The temperature is preferably C or lower, particularly 150 to 180°C to stably obtain low crimp. In addition, in order to satisfy the crimp characteristics required for carpets, high temperature heat treatment is performed at 200° C. or higher, preferably 230 to 250° C., using a second stage heater. In this case, the overfeed rate is preferably about 105. Also, set the false twisting speed to a low value. By such a method, a false twisted yarn having the physical properties shown in the present invention can be obtained.

The degree of crimp (K, value) in the present invention is measured by the following method. After winding up the sample with a certifying winder until it reaches a denier of 5000 denier, a load of 10 g is hung at the center of the bottom end of the whole, and this shim is fixed at the center of the top, so that a load of o, ootg/d is applied. A hot water treatment is carried out at 90°C for 30 minutes. Next, leave it at room temperature under no load to dry it, and then dry it again for 10 minutes.
After applying a load of g and leaving it for 5 minutes, measure the yarn length, and
+(a+a). Next, apply a load of 1 kg and
The yarn length after being left for seconds is measured and defined as Lt (mm). K
, is determined by the following equation.

Kl (%) = ((L t L +) / L 2)
X 100 and yarn torque are measured by the following method.

Take out the sample from the package to avoid unraveling and twisting. Under a load of 1 g/d, take the sample to a length of 100 cm, and remove the load of 0, 1*g/d to the center 50 cm of the sample. Fold it in half and hang it with a double string. Leave the yarn in this state until it stops turning, and measure the number of turns with a twister.
Multiplied by yarn torque (T/m).

It is required to be threaded so that it can be used as carpet pile yarn. Since carpets using filament yarns are dyed in a rolled state or after being made into carpets, it is required that the crimp state does not change significantly under the dyeing conditions. In order to satisfy these requirements, the polyester filament yarn must have a value of 15% or less as measured by the above method. When the K1 value exceeds 15%, the crimpability is large and the finished carpet becomes felt and hard, making it completely unsuitable for use as carpet pile yarn. More preferably, it is 5 to 10%. At the same time, the filament yarn must have a water shrinkage rate of 4% or less. If the water shrinkage rate exceeds 4%, the crimp state will change significantly under dyeing conditions, and the special low crimpability required for carpet pile yarns will not be maintained. More preferably, the water production shrinkage rate is 3% or less.

Furthermore, the yarn torque must be 307/11 or less in order to stably carry out pre-bulking.

Even if K1 is 15% or less and water conduction shrinkage is 4% or less, if the yarn torque exceeds 307/m, it will become tangled from the yarn when crimp occurs in the bulking process, making subsequent winding difficult. It becomes virtually impossible to bulk out first. More preferably it is 20T/ffi or less.

The present invention is directed to filament yarns used as carpet pile yarns, and therefore, the single fiber fineness is preferably 7 dr or more, particularly 10 to 30 dr. 7d
If the pile is not grooved, the pile will have no stiffness 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 10.
What about the carpet after making it 00-1500 denier? Used as coil yarn.

Carpet pile threads are required to be stain-resistant. The fibers constituting the filament yarn obtained from this point may have a round cross section, but may also have irregular 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, a hollow cross section, etc. The polymer constituting the thread is preferably a so-called bright polymer, which is typified by titanium oxide and does not substantially contain pigments.

Regarding dyeability, filament yarns that can be dyed under mild conditions without having to be dyed under harsh conditions of high temperature and high pressure are preferred for use in carpets.

As mentioned above, in the present invention, since false twisting is performed with a low number of false twists in order to obtain low crimpability, it is necessary to lower the stretching ratio due to tension, and as a result, the dyeability naturally becomes darker. Although the results are favorable, normal pressure dyeability is unlikely to lead to any improvement in dyeability. In order to improve this dyeability, it is preferable to modify the polyethylene terephthalate polymer.

A specific method thereof includes a method using polyethylene terephthalate copolymerized with sulfoisophthalic acid or the like. The sulfoisophthalic acid modification rate is generally 2 mol% or more, particularly preferably 3 to 5 mol%. It is also possible to use polybutylene terephthalate polymer instead of polyethylene terephthalate polymer, but in that case, lower temperature conditions than those specified in the method of the present invention must be adopted. Regarding the degree of color deepening, sulfoisophthalic acid-modified polyethylene terephthalate polymers are highly effective, and anti-dyeing is possible with both dispersion and cationic dyes.

The present invention will be described above with reference to examples.

Example! A polyethylene terephthalate bright polymer obtained by a conventional method was discharged from a Y-shaped 24-hole spinning nozzle and an undrawn yarn of 420 denier was wound at 3500 m/min. This undrawn yarn was drawn at a draw ratio of 1.40 (90% of the normal draw ratio), a false twist heat set temperature of 180°C, and a winding of 16
007/+ (85% of the normal number of twists), after stretching and false twisting at 18 h/min, heat setting was performed using a second heater at a temperature of 240° C. and an overfeed rate of 10%.

As a result, a processed yarn with a value of 5%, a water conduction shrinkage rate of 3.5%, and a yarn torque of 15 T/M was obtained.

Four of the obtained processed yarns were combined to obtain a yarn fineness of 1200 dr.
A carpet with good texture and performance was obtained by first bulking and then cheese dyeing.

Example 2 Using a 3.8 mol% sulfoisophthalic acid-modified polyethylene terephthalate bright polymer obtained by a conventional method,
Discharged from a spinning nozzle with a Y-shaped cross-sectional shape and 18 holes.
A 270 denier undrawn yarn was wound at 3600 m/min. This undrawn yarn was drawn at a draw ratio of 1.35 (normal draw ratio of 8
5%), false twist heat set temperature 160℃, number of twists 17507/
l (80% of the normal number of twists), after stretching and false twisting at 160 m/min, at a temperature of 240°C, overfeed rate 10%
Heat setting was performed using the second heater.

The results showed a value of 3.8% and a water conduction shrinkage rate of 3. A processed yarn with Q% and yarn torque IOT/In was obtained.

After piling 8 of these processed yarns into a yarn tenyl of 1,600 denier and bulking the end, a loop type carpet was created and directly reverse dyed. As a result, a carpet with good texture, dyeability, and performance was obtained. It was done.

Comparative Example The undrawn yarn shown in Example 1 was drawn at a draw ratio of 1.40, at a false twist heat set temperature of 180°C, and with a twist number of 1800 T/a+, 18
After stretching and false twisting at a rate of 0 m/min, heat setting was performed using a second heater at a temperature of 200°C and an overfeed rate of 15%.

As a result, a processed yarn with a K of 117%, a water conduction shrinkage rate of 5.5%, and a yarn torque of 55 T/m was obtained.

When four of these processed yarns were combined to have a yarn fineness of 1200 denier and bulked at the tip, the yarns became tangled during winding, resulting in extremely poor winding.

The wound yarn was dyed with cheese and tufted, resulting in a carpet with a felt-like appearance, making it unsuitable for use as a carpet.

Patent applicant: Legal company

Claims (1)

[Claims] A carpet made of false twisted yarn consisting of filaments with a single fiber fineness of 7 denier or more, which has a crimp degree of 15% or less, a boiling water shrinkage rate of 4% or less, and a yarn torque of 30T/M or less. A polyester-based low crimp false twisted yarn suitable for applications.