JPS5836215A - Filamentary fiber, its bundled material and preparation thereof - Google Patents

Abstract

PURPOSE:The titled fibers, having an irregular and periodic change in the cross- sectional area along the long direction, and a coefficient of variation and birefringence in specific ranges, a shape similar to that of natural fibers and a structure in which the molecular orientation is partially advanced. CONSTITUTION:Filamentary fibers having an irregular and periodic change in the cross-sectional area along the long direction and a coefficient of variation in the cross-sectional area[CV(F)]thereof in the range of 0.05-1.0. The birefringence (DELTAn) of the filamentary fibers is >=1X10<-2>. The filamentary fibers are obtained from a polyester having repeating units of substantially ethylene terephthalate.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is characterized in that the repeating unit is substantially ethylene terephthalate F.
A novel polyester filament, a novel filament bundle and its I! I'm going to use the standard imitation method.

In summary, the novel filamentary fibers of the present invention have irregular and periodic changes in cross-sectional area size along their length and are partially oriented with molecular orientation. It is characterized by having an advanced structure.

Polyester has many excellent properties and is widely used in the form of fibers, films, and molded products for consumer and industrial purposes, but the novel filamentary fiber of the present invention is similar to natural fibers. It is useful as a material for spun yarn, non-woven structures, etc. with a texture of

Conventionally, many methods for manufacturing fibrous materials from thermoplastic polymers are known, but from the viewpoint of manufacturing principles, they can be roughly divided into orifice molding types and phase separation molding types, which will be described later. The former consists of uniform, regular-shaped tubular holes (i.e., orifices) drilled at regular intervals in the spinneret.
This is a method of obtaining a fibrous material by discharging a polymer from a pipe and cooling and solidifying it while drafting. According to this method, a fiber having a uniform and constant fiber cross-sectional shape based on the geometrical shape of an orifice can be obtained. It will be done.

On the other hand, the latter phase separation molding type, for example, US Patent No. λ9
No. 54,928, specification No. 227.664, “Industrimland I” written by Guano N.
ngn@ering Ch@m1stry Vol.
48, 481s p. 42 (r*5s) J.
! The fibrous material is separated from the melt or solution through a circular nozzle or slit-shaped nozzle using a high-temperature, high-velocity jet stream or flash stream or other phase separation means to form a fine polymer phase. According to this method, a large number of reticulated nonwoven fiber aggregates can be obtained, but the fibers forming this fiber aggregate have different cross-sectional shapes and sizes. It is characterized in that it is not uniform.

The production of fibrous materials using these conventional techniques is carried out industrially and plays the role of providing large quantities of fibrous materials to the market, but when viewed from the viewpoint of suitability as a fiber material and liveability, each However, by eliminating these problems, it is possible not only to provide a new type of fiber material that is even more excellent, but also to provide the fiber material at a lower price.

The present inventors have already proposed the following method as a method for producing a fibrous material that can solve such problems (#Gan.
38993)).

When a filamentary fiber bundle is manufactured by extruding a melt of a thermoplastic synthetic polymer through a spinneret having a large number of slits, the wrinkles of the spinneret are discontinuous in adjacent slits on the melt discharge side. Convex raised parts (mountains) are provided and exist between the wrinkled parts (mountains). Extruding the mosquito melt through a spinneret such that the melt extruded from the slit formed through the slit or recessed area (trough) can communicate with the melt extruded from other slits adjacent thereto; A cooling fluid is supplied to the melt discharge surface of the spinneret and near the slit, and the melt extruded through the slits is taken up while being cooled to form a large number of separated fibrous rivulets. A method for producing a filamentous fiber bundle, which is characterized by converting into a filamentous fiber bundle and solidifying it.

This method can also be applied to polyester whose repeating units are essentially ethylene terephthalate, and it has become possible to obtain new polyester fibrous materials, but depending on its use, it has become possible to obtain fibrous materials with a structure with more advanced molecular orientation. It was preferable to obtain

Therefore, the first object and advantage of the present invention is to create a new type of natural fiber that could not be obtained by conventional methods, such as polyester fiber having a cross-sectional shape similar to silk and irregularity in the axial direction of the fiber. and to provide a bundle of such fibers.

A second object and advantage of the present invention is to provide a new type of polyester filamentary fibers having a shape similar to natural fibers and a structure with partially advanced molecular orientation, and a bundle of such fibers. It is in.

A third object and advantage of the present invention is that it can be used for various types of spinning.

It is an object of the present invention to provide a new type of polyester filament fiber bundle suitable as a material for knitted fabrics, woven fabrics, nonwoven fabrics, and other textile products.

A fourth object and advantage of the present invention is to provide a novel method for manufacturing the novel fibers and fiber bundles as described above.

The inventors of the present invention have conducted intensive research for the above purpose, and have thus far developed a sophisticated polyester filament fiber and a bundle thereof, which have a shape similar to natural fibers and a structure with partially advanced molecular orientation. The present invention was accomplished by discovering that it can be obtained in the form of a heron.

That is, the present invention provides a filament made of polyester whose repeating unit is essentially ethylene terephthalate (11) The filament has irregular and periodic changes in cross-sectional area along its length. (2) Coefficient of variation of filament cross-sectional area (CV (Fl)
) is in the range of aos to to, and (3) the filament has a birefringence (Δn) of at least I
) to (3), and (4) when the bundle of filamentary fibers is cut in a direction perpendicular to the filament axis at any position in the bundle of filamentary fibers. The variation in area is expressed by the coefficient of variation of the filament cross-sectional area within the bundle [Cv] of 005 to 1.
5, the filamentary fiber bundle is produced by extruding a melt of polyester whose repeating units are essentially ethylene terephthalate through a spinneret having a large number of slits. In manufacturing a spinneret, discontinuous protrusions are provided in adjacent narrow gaps on the discharge side of the spinneret, and extrusion is carried out through the narrow gap formed through the concave areas existing between the protrusions. The skeleton melt is extruded from a spinneret such that the melt extruded from other slits adjacent thereto can come and go, and in this case, the melt discharge surface of the spinneret and its vicinity are extruded. is supplied with a cooling fluid to collect the melt extruded through the slits while cooling, converting the melt into a number of separated fibrous rivulets and solidifying the melt, with a minimum draft ratio (Dm ) is at least 280, and the pulling speed of the filamentary fiber bundle is within a range of 1000 V min or less.

The present invention will be explained in more detail below.

[Method for producing the filamentary fiber bundle of the present invention] The method for producing the filamentary fiber bundle of the present invention will be explained first.

As a typical example, the filamentary fiber bundle of the present invention has a large number of slits on the discharge side for extruding a melt of polyester whose repeating unit is essentially ethylene terephthalate, and adjacent slits have Discontinuous protrusions (mountains) are provided, and the melt extruded from the slits existing between the protrusions (mountains) or the slits formed through the concave areas (valleys) is It can be produced using a spinneret characterized by having a structure that allows the molten liquid extruded from the slits to come and go.

To explain the manufacturing method of the present invention in more detail, a filamentary fiber bundle is manufactured by extruding a melt of (the polyester) through a spinneret having a large number of slits.
Discontinuous protrusions (mountains) are provided in adjacent narrow gaps on the melt discharge side of the spinneret, and through the gaps or concave areas (valleys) existing between the protrusions (mountains), The mosquito melt is extruded through a spinneret such that the mosquito melt extruded from a slit adjacent thereto can communicate with the melt extruded from other slits adjacent to it, While cooling the discharge surface and its vicinity by supplying cooling fluid,
This method of producing a filamentary fiber bundle is characterized in that the melt extruded through IIllII is taken over, the melt is converted into a large number of separated fibrous rivulets, and then solidified.

As explained above, in the method of the present invention, the discharge surface of the conventionally known polymer melt is smooth, and discharge holes (orifices) for the melt are independently bored in a regular array. This method is fundamentally different from a fiber manufacturing method in which the melt is extruded from a spinneret.

The basic requirements for the spinneret used in the present invention are as follows:
As also explained in the specification of No. 38993, the spinning modes from cylinder 1 to sixth will be exemplified below. A few examples will be explained below.

A groove with a V-shaped cross section (width: approximately 0.7 ms, depth: approximately 0.7 cm) is formed on the polymer discharge surface of the orifice mouthpiece at approximately 4511 and approximately taS relative to the orifice arrangement.

The holes are intersected at an angle of
When the polymer melt is extruded using a spinneret having concave portions (valleys), the skeleton melt first flows out to cover the entire discharge surface, but at this time, the polymer discharge surface of the spinneret and When the melt of the polymer was taken up while being moderately rapidly cooled by blowing an air stream near it, the melt gradually divided, and the convex portions of the spinneret gradually appeared on the surface of the melt in the form of islands. , a large number of filamentary fibers were able to be pulled off stably and continuously.

(6) Made of stainless steel wire with a diameter of approximately α21m1, with a porosity of 31% and a number of pores per li of 51
When the polymer melt was extruded from the wire mesh using a plain-woven wire mesh with a width of 0 and a length of 16 cam (area 32 d) as a spinneret, the polymer melt initially flowed out to cover the entire wire mesh, but At this time, the polymer discharge surface of the wire mesh and the vicinity thereof are cooled moderately with an air flow, and the melt is gradually divided, converted into a large number of separated fibrous streams, and solidified, thereby forming a large number of fibrous fluids. The filamentary fibers were stable and could be drawn continuously.

(C) Using a porous plate-like body in which a large number of minute metal spheres are filled and arranged in a sparse pattern on at least the surface layer, sintered and fixed, the polymer melt is passed through the slits of the porous plate-like body as a spinneret. A method of manufacturing a large number of filamentous fiber aggregates by extruding.

As explained above, the present invention has a large number of slots on the discharge side for extruding a polyester melt whose repeating unit is essentially ethylene terephthalate, and adjacent slots have discontinuous convex holes. A structure in which the melt extruded from the slit formed by the concave area existing between the mosquito protrusions can come and go with the melt extruded from other slits adjacent thereto. A spinneret characterized by having:

When considered from another aspect, the method described above of the present invention can also be considered as a melt (polymer melt) molding method by using a die having a finely uneven surface. The purpose is to stably form irregularities and suppress fusion between the melt convex portions, while forming a fibrous string mainly from the melt convex portions.

The embodiment of the production method of the present invention depends on the degree of polymerization, melt viscosity, crystallization rate, copolymerization rate, degree of crosslinking, etc. of the polyester polymer used, but partially molecular orientation as in the present invention In the manufacturing method of the present invention for obtaining fibers having a high temperature, it is necessary to have a minimum draft ratio (D-) of at least 280. The minimum draft rate (D-) is defined below.

In other words, at the same time as the withdrawal device is stopped, the silicone oil cooled to -60°C is applied to the roots of the filamentous fibers (i.e., the finely uneven surface of the nozzle) and the discharged melt comes into contact with The fibers are instantly frozen to obtain five specimens in the thinning process. The average of the maximum cross-sectional area in the continuously thinning part of this specimen is 8max, and the cutting rate ('D
m) is obtained.

However, ρL is the specific gravity of the fiber after the completion of attenuation, and -0 is the specific gravity of the melt at the temperature at the moment the melt is discharged from the nozzle.

When DIII is less than 280, the molecular orientation is insufficient and the crystallinity in terms of Hen, XIs becomes low, making it impossible to obtain filamentary fibers exhibiting desired physical properties. Furthermore, when Dml+ is small, the boiling water shrinkage rate also tends to be small. Dm2 is preferably 400 or more, particularly preferably 600 or more.

The present invention '41 and others have conducted extensive research on means of increasing Dm and have found that it is very effective to directly heat the finely uneven surface of the die. That is, when producing a filamentary fiber bundle by extruding the polyester melt through a spinneret having a large number of slits,
Discontinuous protrusions are provided in adjacent narrow gaps on the shell melt discharge side of the spinneret, and the shell melt extruded from the narrow gap formed through the concave areas existing between the protrusions is disposed therein. The melt is extruded from a spinneret that can communicate with the melt extruded from other adjacent slits, and at this time, at least the spinneret on the discharge side surface is heated while the melt is discharged from the wrinkled spinneret. It is characterized by supplying a cooling fluid to the surface and its vicinity to collect the molten liquid extruded through the slits while cooling the molten liquid, thereby exchanging the molten liquid into a large number of separated filamentous rivulets, and solidifying the molten liquid. It has been found that the method for producing filamentary fiber bundles (see the specification of Japanese Patent Application No. 41-136699) is particularly preferable for obtaining the filamentary fibers of the present invention.

Here, "heating the nozzle on the discharge side surface" means that the temperature near the nozzle surface becomes higher than the temperature in a certain range surrounding the vicinity of the nozzle in the polymer discharge direction.

By using this method II &, for example, polyethylene terephthalate having an intrinsic viscosity of 0.910 and a minimum draft rate of up to 4004 can be needled to vaoo or higher. Although I am not sure about the reason for this, it is presumed that heating the surface of the nozzle helps reduce the elastic behavior of the polymer near the nozzle.

In order to heat the discharge side surface of the die, it is necessary to supply energy to the die surface. There are various methods for this, including cases where the surface of the die is made to generate heat by itself, cases where it is heated by heat transfer, and cases where both are used in combination.

As a means to generate self-heating on the surface of the mosquito cap.

A method in which the surface of the mouthpiece is made of a conductive material, and the surface of the mouthpiece is connected to a DC or AC power source to energize it to utilize the Joule heat generated on the surface of the mouthpiece (hereinafter referred to as the "electrification heating method"). A method that utilizes so-called induction heating, in which a casting magnetic field of a suitable frequency is applied to the die, and an eddy current is generated to generate heat; - There is a method that utilizes so-called dielectric heating, which causes electric loss and generates heat.

As a means for heating the surface of a cough mouthpiece by heat transfer, the mouthpiece surface itself or its vicinity is formed into an organization consisting of thin tubes, and a heating medium is flowed into the thin tubes to heat the surface of the mouthpiece (hereinafter referred to as a method). There is a method of heating the surface of the scissor cap by radiation by projecting light containing a wavelength such as infrared rays onto the surface of the cough cap that can be absorbed by the substance on the surface of the cough cap.

Another effective means for improving the minimum draft ratio (D-) is to discharge the melt in the direction opposite to gravity and take it out to form fibers (see the specification of % Application No. 1983-46344). has been found to be particularly effective in the present invention. The reason why this method is effective in improving Dm is still unknown, but this method improves Dm by 10-20% compared to the method of discharging in the direction of gravity and taking it back. I can do it.

Another major feature of the present invention is that fineness with molecular orientation to the desired level can be obtained at a much lower speed than the conventional spinning method using Orice. Currently P
OY (partiallyorl・nt@d yar
According to the present invention, fibers with a birefringence Δn = 0.049 degrees, which can be obtained at a spinning speed of several thousand and forty-seven minutes, which is generalized as n), can be easily obtained at a spinning speed of several hundred meters or less, according to the present invention. . This is very advantageous for direct fabric making, which is one object of the present invention. It is preferable from the viewpoint of equipment and production stability that the production rate of the nonwoven fabric is about several tens to several lOO/min. Therefore, when spinning a high-density fiber bundle as in the present invention, the speed of the spinning process leading to the non-woven fabric process is preferably about several 10 to several 100 m/min. Therefore, fibers with advanced molecular orientation can be obtained at a spinning speed of several 10 to several 100 m/min, which is more convenient because drawing, heat treatment, etc. can be simplified.

Moreover, since a partially oriented large fiber bundle can be obtained at a low speed as in the present invention, it is also possible to obtain a spun yarn with a new texture by continuously performing a process such as tow spinning.

In the present invention, the take-up speed of the filamentary fiber bundle is within the range of 1000 TI/min or less. 1o
If the speed exceeds o o tpt/min, there is no effective cooling means, so the melt cannot be divided into sufficiently fine fibers, and the speed is also inconvenient for direct fabric production.

The filamentous fiber bundle with advanced molecular orientation obtained by the present invention is continuously stretched at a low magnification (usually 1
．． 5 to 2 times) and then further continuously supplied to the non-woven process.

According to such a method, it is possible to manufacture a nonwoven fabric with extremely simple equipment. Furthermore, if the hot drawing step is omitted and the fabric is made into a nonwoven fabric and then heat treated to loosen it to some extent, a nonwoven fabric with a special grained texture can be obtained due to the large shrinkage effect of the fiber bundle of the present invention. Furthermore, as described above, a spun yarn closely resembling natural fibers with a non-uniform cross-sectional area can be obtained in a continuous process.

In the present invention, the polyester whose repeating units are essentially ethylene terephthalate means that 4 or more so mol, preferably 90 mol or more of all units of the polyester are ethylene terephthalate units. The remaining portion is, for example, an aromatic dicarboxylic acid such as phthalic acid, isophthalic acid, terephthalic acid, diphenyldicarboxylic acid, naphthalenedicarboxylic acid; an aliphatic dicarboxylic acid such as adipic acid, cepatic acid, decanedicarboxylic acid; or hexahydroterephthalic acid. The dibasic acid component is an alicyclic dicarboxylic acid such as hexamethylene glycol, L4-dihydroxycyclohexane, dihydroxydiphenyl, dihydroxydiphenyl ether, propylene glycol.

trimethylene glycol, tetramethylene glycol,
Tecamethylene glycol, diethylene glycol, 2.
2-Dimethylpurpanediol.

Condensed units having an aliphatic-1-alicyclic- or aromatic-glycol as a glycol component, such as hexahydroxylylene glycol or xylylene glycol, or preferably phthalic acid, isophthalic acid, diphenyldicarboxylic acid, naphthalene dicarboxylic acid, etc. Aromatic dicarboxylic acid;
Copolymerization of condensed units with an aliphatic dicarboxylic acid such as adipic acid, sepatic acid, and decanedicarboxylic acid, or an alicyclic dicarboxylic acid such as hexahydroterephthalic acid as a dibasic acid component and ethylene glycol as a glycol component. It's okay.

In addition, it is a feature of the present invention to copolymerize an alcohol or carboxylic acid having a trifunctional or higher functional reactive group such as pentaerythritol or trimellitic acid, and to introduce a crosslinking component to the extent that the moldability of the polymer is not impaired. One purpose is to make it easier to obtain oriented fibrous materials.

The degree of polymerization of the polyester is preferably as high as possible to allow molding, and the intrinsic viscosity ((y)) when dissolved in ornchlorphenol at 25°C is at least <1.4;
Preferably it is at least 0.7. The higher the value, the higher the viscosity during melt molding, making it easier to obtain molecularly oriented fibers. With normal molding methods, the temperature is too high [η
] is difficult to mold, but according to the method of the present invention, polyester with a very high [η] can also be molded.

The polyester may be mixed with other polymers in an amount of up to 20 weight, preferably up to 10 weight. Examples of the polymers that can be mixed include (+1 polyester polycondensate metal material consisting of other components (for example, the above-mentioned polyester polycondensation metal material consisting of one condensation unit), (cap polyethylene, polybupylene, polybutylene).

Polyolefin or polyvinyl polymers such as polystyrene, polyvinyl chloride, polyvinyl acetate, polyacrylonitrile copolymers, (In Boley 6-caplactam, polyhexamethylene adipamide, polyhexamethylene heptavacamide, Polyamides such as xylidene terephthalamide.

Examples include other types of polymers such as polycarbonate using various bisphenols, polyacetal, various polyurethanes, and copolymerized polyfluorinated ethylene.

A plasticizer, viscosity increaser, etc. may be added to the polyester melt in order to increase plasticity and melt viscosity. Also included in the polymer is a light stabilizer that is usually used as an additive for fibers.

Pigments, heat stabilizers, JI refueling agents, lubricants, matting agents, etc. may be added.

[Filamentary fibers of the present invention and bundles thereof] According to the present invention described above, by adjusting the properties of the polyester whose repeating unit is essentially ethylene terephthalate, the structure of the spinneret, the spinning conditions, etc. It is possible to produce filament-like fiber bundles with an average distance of about 3000 to several tens of meters or even hundreds of meters in a continuous and stable operation between the bonding points of the filaments.

The filaments constituting this fiber bundle are (1)
This filament has irregular and periodic changes in cross-sectional area along its length, and (2) coefficient of variation of cross-sectional area within the filament (CVIF5).
) is in the range of aOS~10, and (3) the birefringence (Δn) of this filament is small (both I x 10-''). It is also different from fiber.

The filament internal cross-sectional area variation coefficient [Cv (g)
] indicates the variation in the fineness of the filament in the longitudinal direction (axial direction), and for any one filament in the fiber bundle, select 3 CIL at any l location and divide it into 1 The size of the cross-sectional area for each interval was measured by microscopic observation, and the average value (λ) of the cross-sectional area of 3G45 and the standard deviation (σA) of the 30 cross-sectional areas were calculated using the following formula (2). It can be calculated from

σA CV = - (2) The filament F constituting the fiber bundle of the present invention has the above Cv
(G) is in the range of 0.05 to 1.0, and 4I
K aos ~0.7, especially o, i ~o, s
Preferably, the range is .

In addition, the birefringence index (Δn) of the filament here is
It is measured by conventional methods such as the Senalmo method, the Babinet method, and the interference fringe measurement method, and is the difference between the refractive index in the direction of the rut fiber axis at the central axis of the filament and the refractive index in the direction perpendicular to the fiber axis.

Although Δn becomes a large cage, the molecular orientation is progressing.

The filamentous cord of the present invention has the above Δn of at least I
X 1 G-'', preferably at least L 5 X 10-'', especially at least 2X101.

The filamentary fibers of the present invention preferably have an X-ray crystallinity (Xcr) of at least 3 degrees, more preferably at least 5 degrees. The X-ray crystallinity referred to herein is determined by the method described below from the reflection intensity of X-ray diffraction.

X-ray crystallinity measurement method: An X-ray generator for diffraction, a wide-angle diffraction needle and a needle-pass unit are used. The sample was mounted on a holder of Table 51 length so that the width density was about 221/111, and the diffractometer was swept in the equator direction while rotating the sample in the vertical plane to find out what happens when the fibers are randomly oriented. Take the total diffraction lines. Next, we take the diffraction curve in the meridian direction and find the reflection due to the amorphous part, and if we exclude the peak due to the crystalline part in the meridian direction, we get:
A baseline is obtained from the reflection of a clean amorphous area.

Furthermore, find the scattering line due to air. 2#=100~
These diffraction curves are superimposed at 40°, C, T, and A are determined, and the degree of crystallinity (Xer) is calculated using the following formula (3).

However, C = area surrounded by (total diffraction lines) and (baseline due to reflection of amorphous part) T = area A surrounded by (total diffraction lines) and (iI of zero height) = (air scattering line) and (height In the case of the polymer of the present invention, the filamentary fibers of the present invention usually have a degree of X-ray orientation of 60 degrees or more, and the degree of X-ray orientation varies depending on the increase or decrease of Δn. There is a correlation with However, the degree of X-ray orientation (sword is determined by the following formula (4) from the half-width H (degrees) in the azimuth direction of (xoo)ii.

The filamentary fibers of the present invention, unless subjected to heat treatment or heat elongation, will shrink by at least 30 when immersed in water without tension for 10 minutes. That is, the water production shrinkage rate (8w) is at least 30 inches.

The filamentary fiber made of polyester whose repeating unit is essentially ethylene terephthalate according to the present invention has values of birefringence (Δn), X@ crystallinity, and water production shrinkage (Sv) in the above ranges. , on average, POY (partially orient@d
Although the structure is similar to that of yarn), the two are decisively different in that the cross-sectional area changes irregularly and periodically along the length of the filament. In addition, from the viewpoint of the manufacturing method, 3,000m/
Unlike the method that spins from an orifice and slowly cools it at a high drawing speed of several minutes or more, in the present invention, as described above, the
The fibers are spun and rapidly cooled at a take-up speed of at most 1 minute and at a minimum draft rate of at least 280. Therefore, it is thought that the distribution of fine structures within the cross section of the filament is different from that of the conventional method.

Furthermore, in the filamentary fiber bundle of polyester according to the present invention, the variation in the cross-sectional area of each filament when the bundle is cut at an arbitrary position in a direction perpendicular to the filament axis is determined by the coefficient of variation of the filament cross-sectional area within the bundle [Cv prisoner]
It is in the range of 0.05 to 1.5, and particularly preferred is a CV value in the range of a2 to 1.

This CV prisoner randomly extracted 100 partial focusing bodies from the above focusing body, measured the size of each cross section by observing the cross section at an arbitrary position under a microscope, and the average value (
B) and the standard deviation (#B) of its 100 cross-sectional areas, it can be calculated from the following formula (5) % formula % (5).

In the filamentary fiber bundle of the present invention, when the bundle is cut in a direction perpendicular to the filament axis at an arbitrary position, the cross section of each filament has a random size and shape. characterized by being substantially different.

In the filamentary fiber bundle of the present invention, each filament has a non-circular cross section when the bundle is cut in a direction perpendicular to the filament axis at an arbitrary position. The degree of the valve form is determined by the maximum interval (D) between the circumscribed 2,000-line lines and the 2,000-line circumscribed line.
The filament of the present invention has a shape factor (D/d) of at least 1.1; Most are at least 1.2.

Furthermore, the maximum irregularity coefficient ((D/d) wax
) and the minimum irregularity coefficient ((D/d)min), similar to the above-mentioned maximum difference ((D/d)
maw - (D/d) min) is small<tomo00
5, preferably at least al.

Furthermore, the fiber bundle of the present invention is characterized in that it has irregular rings as a collection of undrawn yarns, and each filament constituting the fiber bundle has a randomly different crimp. It is said that

Such different irregularities in each filament become more noticeable when the fiber aggregate in an undrawn state is subjected to a submergence treatment or a boiling water treatment after drawing.

The filamentary fiber bundle of the present invention is a bundle of a large number of fibers made of polyester whose repeating unit is essentially ethylene terephthalate, and when the fibers forming the bundle are cut in a direction perpendicular to the fiber axis. The cross section of each fiber has a different shape and size, and according to the definition explained in the main text, (1) the average fineness within the bundle of fibers forming the fiber bundle (
D.) is Q, in the range of 01 to 1000 d.; (H) the coefficient of variation of the filament cross-sectional area within the bundle of the fineness of the fibers forming the fiber bundle, rCV), is in the range of O1 to 1.5; The filament internal cross-sectional area variation coefficient (CV (F5)) in the longitudinal direction of the fiber forming the fiber is 0.
A range of 0.05 to 1.0 is suitable.

Average fineness (average denier) within the above bundle.

Do) may be 3 if it is convenient to randomly extract 10 100 partial concentrators from the mosquito concentrator. (When 3 pieces are extracted, there is almost no difference from when 10 pieces are extracted.) One place in the direction of the fiber axis of each partial bundle is randomly selected and cut in the direction perpendicular to it, and the cross section is examined under a microscope. Cut out individual fiber cross-sections from photographs taken and magnified approximately 2000 times, measure the weight of each, divide the total by the number of lines in the cross-sectional photograph, average it, and calculate the value [m
] is converted into denier (de).

Therefore, the average fineness within this aggregate be is calculated using the following formula.

De==, m(A) Thus, the fiber bundle of the present invention is often highly crimped by heat treatment due to the moderate irregularities in the fiber cross section and length direction and the anisotropic cooling effect provided during fiber forming. This property can be applied to increasing the mutual entanglement of fibers.

The fiber bundle of the present invention further comprises:
It can also be easily applied to orthogonal nonwoven fabrics made by orthogonally bonding them together, random structure nonwoven fabrics made by applying electricity or air, and artificial leather.

The fiber bundle of the present invention can be used as a material for all other textile products.

The present invention will be explained in more detail below with reference to Examples. However, the following examples are provided to clarify the understanding of the present invention, and are not intended to limit the present invention in any way.

Examples 1 to 6 A chip made of polyethylene terephthalate having an intrinsic viscosity of 0.91 was melted with a screw and introduced into a die to form a plain woven wire mesh (wire diameter 0.34 cm) with a width of 2 cR and a length of 50 cm.
(bait, 30 mesh) Discharge the melted polymer upward from the mouth surface and blow cooling air to the minimum trough F.
A fiber bundle was obtained by pulling the fiber bundle to a ratio (Dm) of 280 or more.

At this time, electricity was applied to the wire mesh to generate self-heating using Joule heat.

The average fineness (do) and the coefficient of variation of the cross-sectional area within the filament (Cv) are the manufacturing conditions for the fiber bundle.

Table 1 shows the birefringence (8n), X-ray crystallinity (Xer), nasal shrinkage (Sv), X-ray orientation f1 strength and elongation. However, the cooling air velocity is a value measured at a location above the mouthpiece surface. Further, the intrinsic viscosity of the obtained fiber bundles dissolved in O-chlorophenol was found to be around 0.8 in all cases.

Table 1 Comparison example! ~3 A chip made of polyethylene terephthalate similar to that in Example 1 and having an intrinsic viscosity of 091 is melted with a screw, introduced into a die similar to that in Example 1, and the polymer is discharged upward from the same die surface and cooled. While blowing air
Make the minimum draft rate (Daei+) less than 280 #l
! I took over Itsuka. At this time, the test was conducted both when the wire mesh was energized and when it was not energized. These results are shown in Table 2 in contrast to Table 1. Obviously, Δa, Xer, and strength are smaller than those of Examples 1 to 6.

Comparative Example 4 A chip made of polyethylene tere-7tanto similar to that in Example 1 was melted with a screw, measured with a gear pump, introduced into a die, and the polymer was melted through a die with an orifice structure having 6 holes with a diameter of α6 and a land length of 5II m. was discharged upward, and without blowing cooling air, it was withdrawn at a rate of 11) 1c1@/m.

The results are also shown in Table 2.

Example 5 The fiber bundle obtained in Example 3 was further stretched 15 times at 90°C, then tow-spun and woven into a plain weave, yielding a wild silkworm-like fabric.

Table 2 Example 8 The fiber bundle obtained in Example 4 was continuously heated at 100°C.
．． The fibers were stretched 5 times, the parallelism of the fibers was maintained, an acrylic acid ester binder was applied as it was, and the film was then continuously layered on a Tetron film (25μ thick) at 200°C and 30U/c.
A very strong and highly utilized laminate product useful for tape substrates was obtained by p-lying at d.

Patent applicant Teijin Ltd.

Claims (1)

[Scope of Claims] L A filament made of polyester whose repeating unit is essentially ethylene terephthalate, comprising: (1) a filament having a cross-sectional area of irregular periodic length along its length; (2) Coefficient of variation of filament internal cross-sectional area [Cv(g)
] is o, o s ~1. (3)
The birefringence (6m) of this filament is at least I
Filamentary fiber according to claim 1, characterized in that it has an IX degree of crystallinity (Xcr) of at least 3-l. The filamentary fiber according to item 1 or item 2, wherein the repeating unit is substantially ethylene terephthalate. Each filament constituting the bundle has a cross-sectional area that changes irregularly and periodically along its length, and (tJ). g)] is in the range αo5 to LO; The variation in the cross-sectional area of each filament when the wrinkled bundle is cut is expressed by the coefficient of variation of the cross-sectional area of the filament within the bundle [Cv].
tS range. A filamentary fiber bundle characterized by: & Cough Each filament is determined by its X-ray crystallinity (Xcr
5. The filamentary fiber bundle according to claim 4, wherein the fiber bundle is at least 3 times long. 6. The filamentary fiber bundle according to item 4 or 5, wherein each of the filaments has a boiling water shrinkage rate (Sv) of at least 30%. 7. When producing a filamentary fiber bundle by extruding a polyester melt whose repeating units are essentially ethylene terephthalate through a spinneret having a large number of slits, the mosquito melt discharge side of the spinneret is A discontinuous convex part is provided in an adjacent narrow gap, and the melt extruded from the narrow gap formed through the concave section existing between the convex parts is extruded from another narrow gap in contact with it. extruding the melt through a spinneret that can communicate with the melt;
At this time, a cooling fluid is supplied to the discharge surface of the molten spinneret and the vicinity thereof to cool the molten liquid, and then the molten liquid extruded through the slits of the woven spinneret is taken up and the molten liquid is divided into a large number of separated fibers. The minimum draft rate (D
llil) is at least 280, and the take-up speed of the filamentary fiber bundle is 11@l of 1000- or less.
A method for producing a filamentary fiber bundle, characterized by: 1. When extruding the melt from the armpit spinneret, at least the spinneret on the discharge side surface is heated, and cooling fluid is supplied to the melt discharge surface of the armpit spinneret and its vicinity. Method for manufacturing filamentary fiber bundles. Item 7 or 8 describes that when drawing the #molten liquid extruded from the spinneret, a fibrous stream is drawn in the direction opposite to gravity from the discharge surface oriented in the direction opposite to gravity. A method for producing filamentary fiber bundles.