JPH0441729A - Polyester yarn for special processing - Google Patents

Abstract

PURPOSE:To provide the subject yarn having a low elongation and an excellent handling property, capable of giving processed yarns of various structures and imparting bulkiness and waxy touch to woven fabrics by blending small fineness filaments with uneven large fineness filaments, both the kinds of the filaments having different elongations. CONSTITUTION:A polyester polymer is melt-spun from a spinneret having two or more kinds of nozzle diameters and blown with air to form multi-filaments having a single filament difference of >=1.2d between the different kinds of the filaments. The multifilaments are further shrunk preferably in a relaxation degree of >=60% while being heated at 80-135 deg.C to provide the objective polyester yarn comprising small fineness filaments a1, a2 having an average fineness difference of >=1.5d and large fineness filaments b1, b2, with an elongation larger >=50% than those of the filaments a1, a2, of a short length and having at least fineness irregularity between the single filaments, wherein both the kinds of the filaments a1, a2, b1, b2 have elongations of >=150%.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a polyester yarn for special processing to obtain comfortable clothing with excellent comfort. By adding processes such as twisting and interlacing to these processes,
This relates to polyester yarn for special processing to obtain various special processed yarns, such as having fluff due to differences in physical properties, differences in structure such as differences in crimp, and differences in yarn length between filaments between and within the filaments. .

(Prior art) Conventionally, polyester processing systems are uniform, easy to handle during weaving and weaving, and have good wash and wear properties, so they have been widely used for outer clothing, etc. However, they have been widely used for outer clothing, etc. In comparison, it has a metallic appearance and a waxy feel, which is why its use in high-end clothing is currently restricted.

The comfort of wool etc. is obtained from its irregularities, such as the irregular arrangement of its constituent fibers, uneven fineness in the longitudinal direction, uneven fineness between fibers, and the presence of slightly different crimps. It has the structural characteristics of wool.

In other words, it has been desired to develop a polyester processed yarn that is highly irregular and easy to handle.

As a means of imparting irregularity to the yarn, for example, there is a method of false twisting thick and thin yarn, which is obtained by unevenly stretching undrawn yarn in a hot bottle, but the yarn obtained by this method has a large fineness section. is too brittle and has too much elongation to be of practical use.

On the other hand, there is also thick and thin yarn, which is made by non-uniformly drawing highly oriented undrawn yarn in a hot bin, but this yarn has little unevenness in fineness and the elongation of the large fineness part is around 100% or less, so it cannot be subjected to false twisting. Even if other modifications are applied, the amount of modification is small and sufficient yarn length difference and irregular structure cannot be obtained, making it impossible to obtain processed yarn with the irregular physical properties and structure required by the present invention.

Furthermore, attempts have been made to create irregularity by combining two threads of different properties with gold thread.

For example, Japanese Patent Publication No. 62-57728, Japanese Patent Publication No. 58-58-
No. 53088, Japanese Patent Application Laid-open No. 56-26024, etc., describe crimped yarns obtained by false twisting thick and thin yarns and highly oriented undrawn yarns or drawn yarns. However, the thick and thin yarn, the highly oriented undrawn yarn, and the drawn yarn, which are the supply systems for the crimped yarn obtained above, all have an elongation of less than 150%, and
There is no difference in thread length between these filament groups. Therefore, the amount of deformation during stretching and false twisting is less than 100%, and it is not possible to cause a large deformation of 100% or more, and no difference in physical properties or crimp can be created between the filaments or within the filament.

Furthermore, since there is no yarn length difference between the filaments, even if actual twisting or false twisting is performed, loop fluff is difficult to come out from between the twisted wires, which is an object of the present invention.

It is not possible to form parts that are subjected to deformation effects such as stretching or twisting, and parts that are not. 2. The present invention requires irregularities in which there are extremely large differences in physical properties, crimps, and yarn lengths between and within the filaments. I can't give it.

Further, Japanese Patent Publication No. 11130/1983 describes a crimped yarn obtained by drawing and false twisting at least two types of filament yarns having a difference in elongation of 100% or more.

However, the elongation of at least one of the yarns used as the supply system for obtaining this crimped yarn is less than 150%, and furthermore, there is a difference in yarn length between the filament groups constituting these yarns. Therefore, it is not possible to provide the irregularity in which there is no difference in physical properties, crimp difference, and yarn length difference between and within the filaments, which is required by the present invention as described above.

Furthermore, when manufacturing any of the crimped yarns mentioned above, 2
It is necessary to use more than one type of supply system, which has the disadvantage that the crimped yarn obtained by processing is likely to separate into two or more. In addition, in order to prevent this separation, there are restrictions on use, such as adding real twist and requiring air entanglement.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned drawbacks. 1. The present invention solves the above-mentioned drawbacks. Special methods are used to obtain various types of specially processed yarns, such as processed yarns with structural differences such as changing physical properties, and processed yarns with loop fluff and, in addition to these irregular structures, differences in dyeability. The technical problem is to provide a polyester yarn for processing.

(Means for Solving the Problems) In other words, the present invention has a method in which the average fineness difference of single filaments is 1
．． It is a polyester multifilament yarn consisting of a group of thick filaments of 5d or more and a group of fine filaments, and the elongation of both the thick and fine filament groups is 1.
50% or more, and the elongation of the large fineness filament group is 50% or more greater and the yarn length is shorter than that of the fineness filament group, and at least the single filaments constituting the large fineness filament group have unevenness of fineness. The gist of this article is a polyester yarn for special processing, which is characterized by:

The present invention will be explained in more detail below.

FIG. 1 is a schematic external view showing one embodiment of a filament constituting the polyester yarn for special processing of the present invention.

In FIG. 1, +alva2 is a single filament (fine filament) constituting the fine filament group, and has a crimp in the longitudinal direction and uneven thickness. Further, +bl+b2 is a single filament (thick filament) constituting the thick filament group, and also has a crimp in the longitudinal direction.

It also has uneven thickness. Furthermore, the fine filament has a longer yarn length than the thick filament.

In Fig. 1, two filaments each are shown as forming the fine filament group and the thick filament group, but in the yarn of the present invention, the fine filament group and the large fine filament group each consist of two or more filaments. It is composed of Filament) a+ and a2+ The filaments b and b2 have approximately the same fineness, but in the yarn of the present invention, in addition to the fine filament group and the thick filament group, there may be a large number of various filaments of intermediate fineness. Also.

In FIG. 1, fineness unevenness exists in both the single filaments of the fine filament group and the thick filament group, but it is sufficient that at least the thick filament group has the fineness unevenness.

Further, the difference in average fineness between the single filaments constituting the thick filament group and the fine filament group must be 1.5d or more. If the average fineness difference is less than 1.5d, stretching or stretching false twisting is performed.

Thick fineness yarns are elongated relatively preferentially, and the fineness approaches that of fine fineness yarns, making it impossible to express the unrestricted feel obtained from the difference in fineness.

In the case of polyester multifilament yarn, comfort can be improved by changing the homogeneous structure of the filament yarn to a structure in which the filaments are intertwined in a non-uniform manner, with irregularities, or with differences in yarn length. This is known from past experience and research, and one way to do so is to
It is important to express the difference in fineness, that is, the tactile sensation that is a mixture of softness and hardness. In the case of the yarn of the present invention, the average fineness difference must be at least 1.5 d or more in order to obtain the tactile sensation of this difference in fineness with the processed yarn after special processing.

Next, in the yarn of the present invention, the thick filament group is 200%
As described above, the fine filament group has an elongation of 150% or more, and the thick filament group has an elongation greater than the fine filament group by 50% or more.

When applying the yarn of the present invention to subsequent processing, the draw ratio or draw false twist ratio is selected in accordance with the fine filament group, which is a low elongation yarn. In other words, if the draw ratio and false twist draw ratio are selected so that the low elongation yarn has an elongation of 9, which is excellent in handling properties, for example, about 20 to 50%, the large fineness filament group, which is a high elongation yarn, is selected. The degree of stretching of the filament is still in the natural stretching region of the stress-elongation curve. Therefore, the unevenness of the filament's fineness is enlarged and stress is concentrated in the thinner part, causing non-uniform stretching and strong unevenness of thickness. is obtained.

In addition, in the yarn of the present invention, all filament groups are 150%
Since the above-mentioned yarn is an extremely high elongation yarn, and the draw ratio and false twist draw ratio can be increased, the thickness unevenness of the thick filament group can be increased by cold drawing. Furthermore, if drawn false twisting is applied, the difference in torsional deformation of the false twist between the fine filament group and the fine filament group becomes large, and an extremely large yarn length difference is imparted between the thick filament group and the fine filament group. I can do it.

On the other hand, the elongation of the fine filament group, which is a low elongation yarn, is 1.
If it is less than 50%, the amount of deformation during stretching or stretch false twisting is 10%.
If it is less than 0%, the difference in deformation that occurs during large deformation as required by the present invention cannot be obtained, and the difference in physical properties between and within the filaments, the difference in crimp, etc. cannot be obtained.

Furthermore, since the yarn of the present invention is composed of at least two or more filament groups with a difference in elongation of 50% or more, the presence of the difference in elongation makes it possible to increase the yarn length between the filament groups during drawing or stretch false twisting. This can be done by widening the difference. If this elongation difference is less than 50%.

Even if drawing or drawing false twisting is performed, the difference in length between the filament groups of the thread after processing is extremely small, and the object of the present invention cannot be achieved. In other words, the yarn of the present invention is subjected to various deformation processes so that the residual elongation after the subsequent processing of the fine filament group having the lowest elongation is preferably 50% or less,
At this time, the larger the elongation difference, the larger the yarn length difference, which can cause differences in physical properties and crimp between and within filaments.

In addition, since the yarn of the present invention has a difference in yarn length between filament groups, if it is twisted as it is, the fine filaments with long yarn length will jump out from the yarn as loop fuzz, and when it is stretched, the loop fuzz portion will not be stretched. , as other parts of the filament are elongated, the thickness unevenness within the filament greatly expands. Furthermore, when stretch-false twisting is applied, the twist is inserted into the long fine filament without being completely stretched, and then it is stretched and heat-set, resulting in non-uniform crimp. In addition to imparting coarse crimp, thermal aberrations occur between and within the filaments, resulting in a textured yarn with an even more inhomogeneous structure. On the other hand, if this yarn length difference does not exist, the twist insertion during drawing and false twisting tends to be uniform, and the non-uniform structure and physical properties required by the present invention cannot be achieved. In order to achieve the objectives of the present invention.

The yarn length difference between the fine filament group and the thick filament group is preferably 5% or more, preferably 10% or more.

Furthermore, in the yarn of the present invention, fineness unevenness exists at least in the filaments of the thick filament group with high elongation, but this fineness unevenness may cause the yarn of the present invention to expand the fineness unevenness in the subsequent processing stage or It is essential for changing heat shrinkage and crimp.

This fineness unevenness preferably has a thickness unevenness of at least 5%, preferably 10% or more in terms of the filament diameter variation rate. If this fineness unevenness does not exist.

Even if it is stretched, it is stretched uniformly and uneven thickness does not occur, so
It is not possible to impart thermal aberration in the longitudinal direction of the filament, and even if the filament is stretched and false-twisted, the crimp becomes uniform, so crimp that varies in the longitudinal direction cannot be obtained.

It is not possible to obtain a structured yarn having the desired complex structure, physical property differences, and yarn length differences.

9. The filament diameter in the present invention refers to the diameter in the case of a thread with a circular cross section, and in the case of a thread with an irregular cross section, a circular cross section corresponding to the cross sectional area of the irregular cross section is assumed, and the diameter of this circular cross section is the diameter of the filament. It is called the diameter.

Stretched into polyester yarn for special processing of the present invention.

Specially processed yarns are obtained by drawing and false twisting or by adding processes such as twisting and interlacing to these processes.

Clear thickness unevenness and heat shrinkage unevenness along the longitudinal direction of the yarn.

Although it is a processed yarn with a structure in which crimp spots are present and uneven yarn length differences exist in the longitudinal direction, it has low elongation and is excellent in handling.

For example, if drawing is carried out under conditions such that the residual elongation is 20 to 50%, clear thickness unevenness will be formed in the large fineness filament group, and the elongation of the large fineness filament group and the fine fineness filament group will result. Since the elastic aftereffects are different and complex stresses are applied, uneven yarn length differences occur in the longitudinal direction. Also.

If the filament is first drawn and then false twisted, the thickest part formed in the large filament group is most preferentially elongated by the false twisting, even though there is a difference in yarn length.

Furthermore, a processed yarn with locally increased yarn length difference can be obtained.

On the other hand, if stretching and simultaneous false twisting is performed under conditions such that the residual elongation is 20 to 50%, the twist is suddenly inserted while maintaining the yarn length difference that exists between the filaments.

Because the yarn is stretched and heat-set, it becomes a processed yarn with a more complex crimped structure.

FIG. 2 is a schematic diagram showing an embodiment of a specially processed yarn obtained by simultaneously drawing and simultaneously false-twisting the yarn of the present invention.

As is clear from the figure, the presence of the thick filament C and the fine filament d produces a texture effect brought about by the difference in fineness, and the thick filament c has distinct thickness unevenness in the longitudinal direction and local It has yarn length differences and crimp is uneven in the longitudinal direction.

It has different physical properties in the longitudinal direction and is responsible for the characteristics of structured yarn. The fine filament d has a shorter yarn length than the thick filament c, and is essentially responsible for the strength and elongation of the processed yarn, and also has uneven crimp in the longitudinal direction, but the fineness Local differences in filament length are small.

In addition, the polyester yarn for special processing of the present invention is as follows.

- For boat fishing, the yarn is subjected to drawing, false twisting such as drawn false twisting, twisting, interlacing, etc., but in special cases, after cold drawing, the yarn is knitted or woven and then Heat treatment may be performed to express differences in properties such as differences in dyeing, yarn length, and properties.

Next, an example of a method for manufacturing a polyester yarn for special processing according to the present invention will be explained.

A polyester polymer is spun at a speed of 2500 m/min or more using a spinneret with spinning holes of two or more diameters,
Preferably, the spinning speed is 3000 m/min or more, and one of the spinnerets is
Air with a length of 50 to 150 cIn below 0 to 50 cm
While blowing air from a blowing tube, a multifilament having two or more types of fineness difference and elongation difference, in which the difference in single yarn fineness is 1.2 d or more at the take-up part, is formed.

Subsequently, the multifilament obtained above is heated with a heater using radiant heat so that the receiving temperature is from around the glass transition temperature (80°C) to around the crystallization temperature (135°C), while heating the multifilament by 30% or more, preferably 60°C. By shrinking at a relaxation rate of % or more, it is possible to obtain the polyester yarn for special processing of the present invention in which the average single filament fineness difference between the thick filament group and the fine filament group is 1.5 d or more.

When the effects of the present invention are to be obtained more markedly.

Spinning may be performed while changing the air volume and wind speed of the near-blowing tube.

In the above-mentioned manufacturing method, the shrinkage treatment is carried out consecutively with spinning, but first, after spinning and winding.

Shrinkage treatment may be performed in a separate step.

In the above manufacturing method, the yarn length difference in the resulting yarn is determined by conditions such as air blowing and the shape of the spinning holes.

Differences in physical properties (fineness, elongation, heat shrinkage rate) change. That is, 1 spinning take-off speed, the shape of the spinning hole [hole diameter, land length, cross-sectional shape (circle, polygon, special shape)].

The properties of the yarn of the present invention can be greatly changed depending on the viscosity (degree of polymerization) of the polymer, etc.

It is known that in order to increase the difference in yarn length and elongation, it is sufficient to increase the difference in the diameter of the spinning holes, but regarding the formation of crimps and uneven fineness.

How the above factors are involved has not yet been fully elucidated.

(Example) Next, the present invention will be specifically explained using examples.

Example 1 There were 18 spinning holes with a hole diameter of 0.51 and L/D=2.15.
Individual.

There are 18 spinning holes with a hole diameter of 0.39 and L/D=2.05.
Polyethylene terephthalate with an intrinsic viscosity of 0.65 is melt-spun from a separate spinneret at a discharge rate of 42.5 g/min, taken up at a speed of 3500 m/min, and then wound up to 110 m/min.
A multifilament of d/36f was obtained.

In addition, at a position 30 cm below the spinneret, 60 cm
While pulsating the air speed in the range of 2 to 4 m/sec from the air blowing tube, the air is applied to the side of the hanging spun yarn at approximately 20°C.
air was blown.

Table 1 shows the structure and physical properties of the obtained yarn.

Table 1 This yarn was subjected to shrinkage treatment using a non-contact radiant heater at a set temperature of 400° C., a relaxation rate of 100%, and a yarn speed of 400 m/min to obtain a polyester yarn for special processing of the present invention. The heat receiving temperature of the yarn during the above shrinkage treatment is approximately 100°C.
(Measurement of heat reception temperature.

(Using a non-contact thread thermometer model NCT-4400-3 manufactured by Transments Engineering, Inc., USA).

The relaxation rate X (%) in the present invention is calculated by the following formula.

In addition, the boiling water shrinkage rate is determined by the following formula.

! I! : Yarn length under load 1/10 (g/d) before boiling water treatment.

β': Boiling water treatment, load after drying (after shrinkage) 1/10
(g/d) Lower thread length.

The performance of the obtained yarn is shown in Table 2.

Table 2: The obtained polyester yarn for special processing has the following A, B,
Processing was performed under the conditions of processing method C.

This yarn was a processed yarn in which thick filaments and fine filaments were intertwined with each other due to differences in fineness, yarn length, and physical properties within the filaments.

In the above processing, elongation stress is concentrated in the details due to uneven fineness in the cold drawing process, increasing uneven thickness.

Because the elastic aftereffects due to elongation differ between the thick filament group and the fine filament group, the difference in yarn length increases.Furthermore, this yarn is subjected to air entanglement treatment, resulting in a bulky processed yarn, and the subsequent heat treatment causes a slight difference in yarn length. The shape was adjusted by elongation, and the result was a low-elongation processed yarn that had good passability during weaving and weaving processes and was stable in terms of yarn quality.

In the above processing, the thickness unevenness and the yarn length difference increased in the cold drawing step, and this yarn was subsequently subjected to drawing and false twisting to obtain a processed yarn having the appearance shown in FIG. 2.

This yarn is stable in yarn quality, with thick filaments and fine filaments having differences in fineness, crimp, and physical properties within each filament, and a large difference in yarn length between thick and fine filaments. It was a processed yarn with low elongation.

In the above-mentioned processing, since the drawing and false twisting processing is performed at a high draw ratio, extremely large yarn length differences occur.

The difference in thickness within the filament also became relatively large.

A processing system with stable filament quality and low elongation was obtained in which there were differences in crimp and physical properties within both thick and fine filaments.

The fabrics woven with the processed yarns obtained in A, B, and C are all different from conventional processed yarn fabrics.

It has a worsted-like fullness and a soft feel.
It was good for the waist.

(Effect of the invention) In this way, the polyester yarn for special processing of the present invention is
It is made up of filaments with different finenesses by applying various processing processes such as drawing or drawing false twisting, and each filament has different physical properties such as uneven fineness and heat shrinkage rate, as well as differences in yarn length between filaments.

It is possible to obtain processed yarns with non-uniform filament structures such as crimp spots, low elongation, and various structured processed yarns with excellent handling properties. As a result, the product has an excellent feeling of swelling and sliminess.

[Brief explanation of drawings]

Figure 1 is a schematic diagram for explaining one embodiment of the polyester yarn for special processing of the present invention, and Figure 2 shows an embodiment of the processed yarn obtained by processing using the yarn of the present invention. It is an external appearance schematic diagram. a l+ 82 "'" Fine filament b,,
b2 Thick filament C Thick filament d Fine filament

Claims (1)

[Claims] (1) A polyester multifilament yarn consisting of a thick filament group and a fine filament group in which the average fineness difference of single filaments is 1.5d or more, and the elongation of both the thick and fine filament groups is 150% or more. The thick filament group is characterized by having an elongation 50% or more greater and a shorter yarn length than the fine filament group, and at least the single filaments constituting the thick filament group have uneven fineness. Polyester yarn for special processing.