KR101685828B1 - Polyester yarn for shielding electromagnetic wave and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a three-piece polyester yarn for electromagnetic shielding using a twist yarn cross-section yarn and a method for producing the same. The above-mentioned method for producing a polyester yarn for electromagnetic shielding according to the present invention has an intrinsic viscosity [?] Of 0.640 to 0.670 A method for producing a three-piece polyester yarn by discharging a polyester polymer through a spinneret and cooling the discharged polymer by a cooling device, characterized in that the cooling by the cooling device is a cooling zone in the spinneret nozzle And the polyester polymer is cooled by attaching the device to the front of the cooling zone of the furnace so that the uniformity is made excellent.
The polyester three-strand yarn for electromagnetic wave shielding according to the present invention having the above-described structure and the method for producing the same are excellent in the deviation and homogeneity of the single yarn fineness between single fibers using a specific cooling device in the production of conventional three- Shielding yarn in which the effect of the three-seam is further increased in a rectangular shape, and a method of manufacturing the same.

Description

TECHNICAL FIELD [0001] The present invention relates to a polyester yarn for electromagnetic shielding,

More particularly, the present invention relates to a polyester multifilament yarn for shielding electromagnetic interference using a twist yarn cross-section yarn, and more particularly to a yarn having a low fineness of 10 denier or less and having a quality of uniformity, uniformity, , Thereby providing a method of producing a product satisfying the demanding properties required by the yarn for shielding electromagnetic waves, thereby providing a stable operation, an increase in profit, and an excellent shielding effect for electromagnetic wave shielding Polyester filament yarn and a method for producing the same.

As the technology develops rapidly and electronic parts such as semiconductor integrated circuits are mass - produced at a low price, electronic devices are supplied in large quantities and take up much space around us. In the electronic parts used in these electronic devices, electromagnetic waves of high frequency are generated, and electromagnetic waves are interfered by the electromagnetic waves, and unnecessary signals due to electromagnetic interference or reception of electromagnetic signals desired by electromagnetic noise are obstacles or microprocessors, There is a case of damage such as malfunction, and since the electronic circuit becomes small and high direct, it is easily influenced even by weak electronic pulse. In addition, the legacy and physiological disturbance of women engaged in computer work has been announced. Since then, it has been confirmed that the electromagnetic waves have a considerable influence on not only the peripheral devices but also the human body, the interest in shielding yarn capable of shielding electromagnetic waves And many studies are being conducted on this. Such electromagnetic wave shielding yarns generally adopt a post-processing method using a conductive material, such as a metal film forming method, a conductive resin coating method, a metal thin film laminating method, and a copper compound fixing method. Meaning that the core yarn, which is the core of the yarn, is required to have a tricky characteristic that must be constant without deviating the deviation and physical properties of the denier. In addition, there is a problem in that, when the conductive material is coated in the post-processing, the coating should be good and the adhesion ratio of the conductive material should be excellent. Currently, three yarns such as 9/6 and 5/3 are being developed for shielding electromagnetic waves. However, these low finenesses have difficulty in uniform cooling between single yarns, It is difficult and it increases the load of the worker. There is a disadvantage that the unit price is expensive because it is sold on the market. In addition, lowering the number of strands for the production of three-sided yarn has a problem of lowering the deposition rate of the coating of the conductive material. In the case of three-yarn production, too low a yarn yields a single- It was confirmed that the product led to the defect. Therefore, the inventors of the present invention have attempted to uniformly cool three filaments of less than 10 deg in a uniformly cooled state by using a series of cooling apparatuses, and to produce excellent quality. In the past, researches have been actively conducted to develop products having three- . For example, Korean Patent Laid-Open Publication No. 2010-0040751 discloses a method of spinning ultra-high-molecular-weight polyethylene under the name "a method of producing low-fineness, high-strength and high-modulus polyethylene fibers" And it is difficult to apply it in a general polyester production method, so that it is not preferable. Japanese Patent Application Laid-Open No. 2004-100138 discloses a polyester fiber having excellent moldability and yarn transfer at the time of weaving, and a method for producing the same. The present inventor has proposed that the cooling medium lacking the fineness of 5 denier to 55 denier can be solved and has excellent physical properties and that the cooling medium to be added to the freezing water coil which is the source of the cooling wind uses cooling water and ethylene glycol, , The cost is raised by producing the cooling air separately from the cooling medium, and it is impossible to solve the problem of solidification, solidification, and cold dispersion due to the denier by simply lowering the cooling temperature. However, There is a problem in commercialization because it is difficult to apply it collectively from a manufacturer.

The inventors of the present invention have conducted intensive studies to solve the problems of the prior art. As a result, the present inventors have found that there is no denier deviation and excellent uniformity in the production of three-fiber yarns having a fineness of less than 10 deg, The present inventors have found that the yarn manufactured according to these methods has improved in all of the above-mentioned aspects, thus completing the present invention.

Patent Document 1: Korean Patent Laid-Open Publication No. 2010-0040751 Patent Document 2: Japanese Patent Application Laid-Open No. 2004-100138

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a method of manufacturing a three-fiber sheet having a low fineness for shielding electromagnetic waves, which has low denier deviation between single fibers and excellent uniformity The present invention also provides a method for producing a polyester cemented yarn.

Another object of the present invention is to provide a method of producing a polyester cement yarn having superior productivity than the three-fiber cords such as 9/6 and 5/3 which are conventional electromagnetic shielding foams.

It is still another object of the present invention to provide a yarn that maximizes the effect of the three seams when the three-seamed yarn of the same denier is used for shielding electromagnetic waves by utilizing a deformed cross-section.

Another object of the present invention is to provide a yarn excellent in the deposition rate of a conductive material when the yarn is plated.

The present invention may also be directed to accomplish these and other objects, which can be easily derived by those skilled in the art from the overall description of the present specification, in addition to the above-mentioned and obvious objects.

Generally, in providing a yarn for shielding electromagnetic waves, variations in the fineness and uniformity of the three fibers in the spinning process have a great influence on the quality in commercialization. In addition, when the conductive material is adhered to the conductive material, the apparent denier increases and the effect of the three-fiber is halved and the adhesion rate of the conductive material is a great obstacle to the production of the electromagnetic shielding yarn. However, As a result, it is possible to solve the above problems by providing a manufacturing method of an electromagnetic wave shielding yarn which can have uniform physical properties by using a specific cooling device and a deforming cross-section, thereby achieving the object of the present invention.

According to an aspect of the present invention, there is provided a method of manufacturing a polyester three-fiber sheet for electromagnetic wave shielding comprising:

A method for producing a polyester three-filament yarn by discharging a polyester polymer having an intrinsic viscosity [eta] of 0.640 to 0.670 through a spinneret and cooling the discharged polymer by a cooling device,

The cooling by the cooling device is characterized in that a device for forming a specific cooling zone between the oil supply portions in the spinning nozzle is attached to the front of the cooling field of the yarn to cool the polyester polymer so that the uniformity is improved.

According to another aspect of the present invention, in the above-described manufacturing method, the discharge hole of the claw is set to 10 to 12 per claw, and 16 or more products are simultaneously produced according to the wrapping package specification.

According to still another aspect of the present invention, the end surface of the above-described nail is characterized by a slit type in which the ratio of the major axis to the minor axis is 10 times.

According to another embodiment of the present invention, the apparatus for forming the specific cooling zone is a front cover having a specific size and shape, the length of which is from the bottom of the recess to the bottom of the cooling chamber, A cooling zone is formed in the cooling zone, and a vortex is not generated in the cooling zone by the cooling zone, and a constant temperature is maintained, and the cooling yarn is cooled in one closed space by the cooling chamber and the front cover.

According to another aspect of the present invention, the front cover having the specific size and shape is a light diffusion film having an angle of 45 to 75 degrees toward the upper side.

According to another aspect of the present invention, the front cover having the specific size and shape is a light diffusion film having an angle of 60 ° toward the upper side.

According to a further feature of the invention, the cooling device is characterized in that it blows cooling air at a speed of 15 to 25 mpm and a temperature of 15 to 25 ° C.

According to another aspect of the present invention, the cooling air having a temperature raised after cooling is discharged by attaching the front cover, thereby maintaining a constant temperature in the cooling zone.

According to another embodiment of the present invention, the manufacturing method includes weaving the yarn produced in the above manner.

According to another aspect of the present invention, there is provided a three-

Wherein the specific cooling zone is produced by a method of producing a polyester polymer having an intrinsic viscosity [eta] of 0.640 to 0.670 by using a specific cooling zone, wherein the specific cooling zone is formed by attaching a front cover type having a constant inclined film, And the monofilament fineness of the produced product is 10 denier or less and the deviation value of the fineness is more than 0 and less than 1.20% as CV%.

The polyester three-strand yarn for electromagnetic wave shielding according to the present invention having the above-described structure and the method for producing the same are excellent in the deviation and homogeneity of the single yarn fineness between single fibers using a specific cooling device in the production of conventional three- Shielding yarn in which the effect of the three-seam is further increased in a rectangular shape, and a method of manufacturing the same.

1 is a schematic view of a front cover according to a preferred embodiment of the present invention,
2 is a schematic view of a manufacturing process of the present invention in which a cooling system according to a preferred embodiment of the present invention is used.

Hereinafter, the present invention will be described in more detail with reference to the preferred embodiments. However, it is to be understood that the present invention is not limited by these embodiments, It will be obvious to those of ordinary skill in the art.

FIG. 1 is a schematic view of a front cover according to a preferred embodiment of the present invention, and FIG. 2 is a schematic view of a manufacturing process of the present invention using a cooling facility according to a preferred embodiment of the present invention.

2, in the method for manufacturing an electromagnetic wave shielding yarn according to the present invention, the polymer polymer is melt-extruded and discharged through the spinneret 1, and the discharged polymer is discharged to the cooling device Specifically, the cooling is performed through the cooling chamber 2 attached under the spinneret 1, and the cooled polymer passes through a lubricating roller (not shown), passes through a godet roller and a separator Drawn by a roller (not shown), and finally wound around a winding equipment.

According to a preferred embodiment of the present invention, the form of the spinneret used in the production method of the present invention is preferably such that the cross-section of the hole corresponding to the number of strands to be discharged is slit-like, and the circular or other cross- It is not preferable because it is difficult to maximize the effect of the three islands.

According to another preferred embodiment of the present invention, a polyester polymer having an intrinsic viscosity of 0.640 to 0.670 discharged through a spinneret having the above-described shape is irradiated at a spinning temperature of 250 ° C to 350 ° C, more specifically 280 ° C to 300 ° C And cooled immediately after irradiation through an air furnace having a temperature of 15 [deg.] C to 25 [deg.] C, through a cooling device having a structure as shown in Figs. 1 and 2.

As shown in FIG. 1, the front cover 4 used in the cooling apparatus according to the present invention is formed such that a plurality of membranes, which are inclined at an angle of 45 to 75 °, most preferably 60 °, Loses. The angle of inclination can be changed flexibly, but if it is set at 45 ° C or less, it is not preferable because the cooling air flows out as it is and it is difficult to maintain a constant temperature in the cooling zone. Conversely, when the angle exceeds 75 °, Which is difficult to close completely. The material of the film may include all materials having SUS and other hardness. The size of one of the light shielding films is preferably 50 mm to 80 mm in length, and each inclined film is preferably laminated with 40 to 60% of the other light shielding films. If it is overlapped to 40% or less, a clearance is generated between the light shielding films and the cooling air is discharged at the clearance, which makes formation of the cooling zone difficult. Further, when 60% or more is overlapped, it becomes close to the completely closed type, and it becomes difficult to discharge the cooling air, which is not preferable. It is preferable to discharge the air from the cooling chamber 2 as low as 10 to 20 mpm, but when the wind speed exceeds 20 mpm, the uniform flow of the polymer flow becomes difficult due to the polymer flow. The present invention is characterized in that a cooling zone is formed to suppress the diffusion of air at low wind speed to promote uniform solidification, to cool the polymer in the cooling zone, and to discharge the air with increased temperature to keep the temperature in the cooling zone constant at all times shall.

According to another preferred embodiment of the present invention, the cross-section of the yarn produced by the above-described method is slit-shaped. When the long axis of the slit type is a and the short axis is b, a is 0.8 mm and b is 0.07 mm . When a is increased, the shear rate is decreased. When the value of a is lowered, the increase of back pressure is disadvantageous due to increase of back pressure. When b is increased, the effect of maximizing seams is undesirably reduced.

Another preferred embodiment of the present invention includes a step of increasing the deposition rate of a substance when a conductive substance is attached by forming a shaft through a heating-twisting process.

The polymer solidified through the above-described cooling device is stretched through a lubricating roller, a stretch roller, a godet roller, and the like as in the conventional operation method, and is finally wound up to produce a product. Conventionally, when spinning at a low fineness, a difference in solidification point occurs due to a deviation of the amount of cooling air discharged, a deviation of an air speed, a deviation of an air temperature, and thus, The occurrence of yarn breakage causes unevenness of uniformity and fineness of fineness, and the deviation between single yarns caused poor quality and single yarn cut in three yarns. However, it can be seen that the cooled polymer can be cooled uniformly without any deviation of deviation, and three filaments having excellent CV% of less than 1.00% in the fineness deviation of less than 10 denier can be produced It was.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the scope of the present invention is not limited to these Examples.

Example 1

A polyester having a titanium dioxide content of 0.3 wt% and an intrinsic viscosity (?) Of 0.652 was spun into a twelve-hole spinneret having a spinneret temperature of 285 DEG C and 16 end, and then divided into six strands and wound up. Lt; RTI ID = 0.0 > degrees. ≪ / RTI > At this time, the temperature was set at 20 DEG C and the wind speed was set at 15 m / min. Then, the above-mentioned polyester was spinned so as to have a single yarn fineness of 9 deniers, followed by lubrication and stretching, and the yarn thus obtained was measured for yarn quality and fineness CV%. Further, the adhesion rate of the conductive material after the tentative burning was examined and it is shown in Table 1 below.

Example 2

A yarn was produced in the same manner as in Example 1 except that the angle of the light shielding film of the front cover was changed to 50 °.

Example 3

A yarn was produced in the same manner as in Example 1 except that the wind speed was changed to 20 mpm.

Example 4

A yarn was produced in the same manner as in Example 1 except that the cooling air temperature of the cooling device was changed to 18 캜.

Comparative Example 1

A yarn was produced in the same manner as in Example 1 except that the warp film was removed.

Comparative Example 2

A yarn was produced in the same manner as in Example 1 except that the wind speed of the cooling device was changed to 35 mpm.

Comparative Example 3

A yarn was produced in the same manner as in Example 1 except that the front cover was removed.

Comparative Example 4

A yarn was produced in the same manner as in Example 1, except that the yarn was not twisted.

division Uniformity
(%) Private club
(mm) Production cut
(Times / ton) Single deviation
(CV%) Conductivity
Material deposition rate Example 1 1.05 One 0.1 0.79 Great Example 2 1.09 One 0.1 0.78 Great Example 3 1.00 2 0.1 0.85 Great Example 4 1.15 One 0.2 0.87 Great Comparative Example 1 1.54 3 0.4 1.95 Great Comparative Example 2 1.97 5 0.1 1.87 Great Comparative Example 3 1.65 5 0.3 2.54 Great Comparative Example 4 1.04 One 0.1 0.84 Bad

As shown in Table 1, the polyester false-twist yarn produced according to the embodiment of the present invention has a stable apostrophe due to a decrease in the magnetic flux of the yarn at the time of manufacture, so that there is no deviation between single yarns even at low fineness, It can be seen that it is excellent.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be obvious to the person.

1 --- Spinning detachment 2 --- Cooling chamber
3 --- Discharged polymer 4 --- Front cover

Claims (7)

A method for producing a polyester three-filament yarn by discharging a polyester polymer having an intrinsic viscosity [eta] of 0.640 to 0.670 through a spinneret and cooling the discharged polymer by a cooling device,
Wherein the cooling by the cooling device is a cooling by a cooling device formed between the oil supply parts in the spinneret nozzle and the cooling device is composed of a front cover formed on the opposite side of the cooling chamber and the cooling chamber, Wherein the oblique film has a size of from 50 mm to 80 mm in length and the oblique film forms a front cover by 40 to 60% overlap with another warp film, And cooling the polyester polymer with an apparatus for forming a cooling zone to produce polyester fibers for electromagnetic wave shielding.
The method according to claim 1, wherein the cross-section of the spinneret has a slit shape with a ratio of a major axis to a minor axis of 10 times.
delete The method according to claim 1, wherein the front cover is a light shielding film having an angle of 60 ° toward the upper side.
The method according to claim 1, wherein the cooling device blows cooling air having a speed of 15 to 25 mpm and a temperature of 15 to 25 캜.
The single yarn fineness is 10 denier or less and the fineness deviation value is more than 0 and less than 1.20% as CV%, which is produced according to any one of claims 1, 2, 4, Features three types of polyester for electromagnetic shielding.


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