KR101673670B1 - Preparing process of the yarn for shielding electromagnetic waves - Google Patents
Preparing process of the yarn for shielding electromagnetic waves Download PDFInfo
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- KR101673670B1 KR101673670B1 KR1020140108301A KR20140108301A KR101673670B1 KR 101673670 B1 KR101673670 B1 KR 101673670B1 KR 1020140108301 A KR1020140108301 A KR 1020140108301A KR 20140108301 A KR20140108301 A KR 20140108301A KR 101673670 B1 KR101673670 B1 KR 101673670B1
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Abstract
The present invention relates to a method for producing an electromagnetic wave shielding yarn, wherein the method for producing an electromagnetic wave shielding yarn according to the present invention is a method for producing an electromagnetic wave shielding yarn, which comprises the step of applying a polyester polymer having an intrinsic viscosity [?] Of 0.640 to 0.670, The polymer discharged from the discharge port is maintained at a constant distance from the end, while the cooling by the cooling device is installed at 10 to 20 cm through the heating zone and the heating zone immediately under the spinneret to slowly cool the polymer, And cooling the discharged polyester polymer.
The method of manufacturing an electromagnetic shielding yarn of the present invention having the above-described structure can be produced by conventional equipment without modification of the conventional splitting apparatus, and is excellent in operability and does not increase the unit price, It is a useful invention that can provide the existing three filaments which are used for electromagnetic wave shielding with much better operation performance and price because it provides excellent cooling efficiency between the first and second filaments, and has a low fineness and excellent fineness and fineness.
Description
More particularly, the present invention relates to a method for producing an electromagnetic shielding yarn, and more particularly, to a method for producing an electromagnetic shielding yarn, in which a low-fineness yarn of 5 deg or less is produced with excellent productivity, The present invention relates to a method for manufacturing a polyester filament yarn for electromagnetic shielding, which is capable of lowering the manufacturing cost and increasing stable operation and profit.
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 components used in these electronic devices, electromagnetic waves of high frequency are generated, which may cause electromagnetic interference, and electromagnetic interference may interfere with the reception of desired electromagnetic signals due to unnecessary signals or electromagnetic noise, or a microprocessor There are cases of malfunctions, such as malfunctions. As electronic circuits become smaller and become more direct, they are easily affected by weak electronic pulses. In addition, the heritage and physiological disturbance of women engaged in computational tasks have been announced. Since then, it has been confirmed that electromagnetic waves have a considerable influence not only on the peripheral devices but also on the human body. Therefore, interest in electromagnetic shielding yarns has increased, have. Electromagnetic wave shielding yarn generally adopts 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, or a copper compound fixing method. , The core yarns are very shallow, but they are demanded of the tricky characteristics that must be constant without any deviation of the deniers. Currently, three islands such as 9/6 and 5/3 are being developed for electromagnetic shielding, Are required to improve the gear pump and are very poor in operation, which makes it difficult to manage in the process, increases the load of the workers, and there is a disadvantage that the price is high in the market. Therefore, it is far more advantageous for the developer to produce the low-fineness of 5de-grade at 50de, and to divide it into 10 strands and to provide the single-stranded single-strand at 5de for electromagnetic shielding. And that it can be offered at a reasonable price. However, we also found that if one strand of 5del is produced after 50de production, the deviation of the deniers of each strand occurs, and in particular, the deviation of 5de may cause the product to be defective . In addition, yarn splitting needs to be excellent in fineness, but if the denier is low, yarn splicing easily occurs. In particular, when there is a deviation between dennisers, it is obvious that the fibrillation becomes worse. The method of producing the monofilaments and fibrillating them to produce monofilaments is a method that has been developed and produced from the past, but the present method is subject to some deviation of the denier. For example, in Japanese Patent No. 2004-100138, there has been proposed a method in which a product is produced at the time of weaving, and the moldability and yarn transfer Excellent polyester fiber and method of producing the same ", it is proposed that when the cooling temperature is 10 ° C to 15 ° C, it is possible to solve the cooling shortage of 5 denier to 55 denier per single filament fineness and has excellent physical properties. The cooling medium added to the coil of the freezing water is disclosed to use cooling water and ethylene glycol. However, in the above-described invention, the cost is raised by producing the cooling air separately from the cooling medium, and merely by lowering the cooling temperature, The exact specification (spec.) Is presented even though it can not solve the solidification point, And it is difficult to apply the method in batches by the producers. Therefore, there is a problem in practical use, and in order to improve the workability of the fibrillated yarn, Korean Patent Application No. 2004-0118057 discloses that " A method for producing a polyester fiber yarn having a single yarn fineness of about 20 to 50 denier, which is improved by 5 to 10% in spraying workability by melt-spinning a polymerized product, and a method for producing the polyester yarn, (F / F) static friction coefficient of from 0.25 to 0.30, and an interfiber (F / F) static friction coefficient of from 0.25 to 0.30, as a spinning oil, in a process for producing a polyester dispersion yarn of 20 to 50 denier and a single yarn count of 5 to 30, A method of producing a polyester dispersion yarn characterized in that volatile oiling is carried out to give an emulsion, However, since the specific emulsion and the specific apparatus to which it is applied are used, the working process is complicated and the unit price is raised. In addition, a denier with a monofilament fineness of 20 denier or less There is no mention or solution for the single yarn of low fineness.
The inventors of the present invention have conducted intensive studies to solve the above-mentioned conventional problems. As a result, the present inventors have found that there is no single denier deviation in the production of a dispersion yarn having a single yarn fineness of 5degree used for shielding electromagnetic waves, We have found a way to satisfy the users in terms of price and productivity, which is superior in productivity and operability than the conventional yarns such as 9/6, 5/3, The inventors of the present invention have made improvements in all of the above-mentioned methods, and completed the present invention.
SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a method and apparatus for cooling a low-fineness dispersed yarn using a specific cooling method, And to provide a method for producing a polyester dispersible yarn which can be provided for shielding electromagnetic waves.
Another object of the present invention is to provide a method and apparatus which can provide superior operational efficiency and productivity without using a special gear pump even when the conventional three-fiber shields such as 9/6, 5/3 are used, To overcome the grievances of the United States.
The present invention may also be directed to accomplishing other objects that can be easily derived by those skilled in the art from the overall description of the present specification, other than the above-described and obvious objects.
In general, the fineness of fineness yarn has been somewhat fluctuated. However, when the fineness is low, a large influence on the single yarn has been a problem. Also, since the fineness is deteriorated due to the deviation, The inventors of the present invention have found that the above problems can be solved by providing a method of manufacturing a low-fineness splittable yarn having uniform deviation in fineness by cooling specific to a single yarn, thereby achieving the object of the present invention .
In order to accomplish the above object, the present invention provides a method of producing a polyester filament yarn excellent in uniformity,
A polyester polymer having an intrinsic viscosity [?] Of 0.640 to 0.670 was cooled in a cooling device while maintaining a constant distance between the ends of the polymer discharged from the polymer discharge port arranged at a predetermined interval in the spinneret, and polyester filament yarns Wherein the cooling by the cooling device is characterized in that the polyester polymer is cooled by an UP-DOWN method in which cooling air is sprayed in the traveling direction of yarn from the detaching nozzle.
According to another aspect of the present invention, in the cooling device, the attachment position is attached at a position 10 to 20 cm below the heat retaining zone immediately under the nipping.
According to another aspect of the present invention, in the cooling device, the nozzle of the cooling air
It has 5 spray nozzles per one hole and has 30 to 40 spools according to the wrapping package specification.
According to another aspect of the present invention, there is provided a film having a specific size and shape,
And is attached to the front surface of the cooling chamber so that the cooling device and the cooling yarn are cooled in one closed space by the cooling chamber and the specific film.
According to another configuration of the present invention, the film having the above-mentioned specific size and shape has a length equal to the length of the cooling field but is started immediately below the up-down cooling device.
According to another aspect of the present invention, the polyester polymer is characterized by containing 0.33 to 0.36% by weight of titanium dioxide.
According to another embodiment of the present invention, said polyester polymer is characterized in that it emits and cools through a spinneret consisting of a regularly spaced W-shaped arrangement.
In order to accomplish the above object, the present invention provides a polyester filament yarn excellent in uniformity of the present invention;
Polyester filaments having an intrinsic viscosity [eta] of 0.640 to 0.670 were cooled by a cooling device while maintaining a constant distance between the polymers discharged from the polymer discharge ports arranged at regular intervals in the spinneret As for the cooling by the cooling device, a cooling device of an up-down type is attached to the lower part of the insulating zone, and the value of the percent change (CV%) of the single yarn fineness of the disperse yarn produced by cooling the discharged polyester polymer is 0 And is 1.00% or less.
According to another aspect of the present invention, the monofilament fineness of the dispersoid yarn is 5 denier or more and 10 denier or less.
The method for producing an electromagnetic wave shielding yarn according to the present invention as described above uses a method of producing a simulated yarn without directly spinning-stretching and then dividing and splitting the yarn for producing the conventional three-yarn yarns, And is a useful invention for providing a method of producing a yarn which can be used in a precision electronic device by overcoming the deviation of the fineness between the single yarns of the existing yarn.
1 is a schematic view of a cooling facility 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 cooling facility 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.
As shown in FIG. 2, in the method for producing an electromagnetic wave shielding yarn according to the present invention, the polymer polymer is discharged through a spinneret 1 having a predetermined gap, and the discharged polymer is cooled The device is slowly cooled to high temperature - room temperature. Then, the cooled polymer is cooled through a specific cooling device 2 attached thereto, and the cooled polymer is passed through the lubricant roller, drawn through the godet roller and the separator roller, and then finally wound around the winding device.
According to a preferred embodiment of the present invention, the form of the spinneret used in the production method of the present invention is such that the number of holes as many as the number of yarns to be discharged coincide with each other and are arranged in a "W & , And the "1" or "O" shape is undesirable because it is difficult to expect the effect of the specific cooling device of the past due to the difference in distance between the single yarns.
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 cooling device has the same length in the width and the same length as the length of the frame to be cooled, and this length can be changed flexibly according to the specification of the cooling frame. The height of the cooling device is about 40 to 60 cm, and it is in the form of a rectangular hexahedron having a portion connected to the pipeline to which the air is supplied to the rear surface. However, there is a hole through which a thread can pass in a circular form, which is a form of detention, and a hole is circular about 10 mm wider than the circumference of the detention. If you have a width of less than 10 psi, a small flow of polymer can interfere with the apostrophe because of the small flow of polymer. If you have a circle that is wider than 10 pie, the efficiency of cooling is reduced and the number of cages Five air jet nozzles are placed along the circumference of the hole around the hole of the cooling device and the gaps are evenly distributed along the circumference. The ejection port of the ejection nozzle is preferably 5 to 10 picoseconds, more preferably 15 to 25 mpm. If the injection speed is less than 15mpm, the amount of cooling is insufficient. Otherwise, there is a possibility that the cooling water can not stably guide the yarn from the cooling zone to the oiling roller. If the injection speed exceeds 25mpm, the polymer may flow from the vicinity of the cooling device, It is undesirable because it can cause turbulence due to the diffuse reflection of air. When cooling is performed in the same manner as above, stable cooling can be performed in the yarn of low fineness, and since the cooling air travels in the yarn running direction while the yarn is fed to the lower lubrication roller, .
According to another preferred embodiment of the present invention, it is preferable that the cooling device is installed at a position 10 to 20 cm below the heat retaining zone immediately under the nipping, because the filaments of low fineness are subjected to the slow cooling as much as possible, In order to prevent flow.
Another preferred embodiment of the present invention is to form a closed cooling zone by cooling a single film from the position of the cooling device to the limit of the cooling frame in the cooling zone. When the air is cooled at the above-mentioned wind speed and temperature by forming a closed space, a stable cooling zone which does not cause turbulence in the inside and uniform cooling can be formed, and the filament can be guided to the lubricant roller without cooling air.
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 a low-fiber road spattering yarn is radiated, a difference in solidification point occurs due to the distance between the spinning holes, the deviation of the radial fineness between the holes, the deviation of the amount of cooling air discharged, the deviation of the air velocity, The occurrence of sandy loam and sandy loam resulted in unevenness of uniformity and fineness, and unevenness of fineness caused monoclinic cuts in canopy, straight and combustible fractions. However, it can be confirmed that the polymer cooled through the cooling device described above is uniformly cooled without deviation and propensity deviation. As a result, excellent durability of the durability of 50 denier and single yarn denier of 1.00% or less % Can be produced.
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 spinned at a spinning temperature of 285 DEG C in a 5-hole spinneret of W type, A cooling device for spraying from five nozzles was installed along the shape of 10 mm wider than the circumference of the cylinder. The temperature was set at 20 ° C and the wind speed was set at 25 m / min. Next, an AL material film having a length from the cooling device to the lower portion of the cooling frame was provided, and the polyester was spinned so as to have a single yarn fineness of 5 denier and then lubrication and stretching. The thus obtained yarn was subjected to a spray- And the measurement results are shown in Table 1 below.
Example 2
A yarn was produced in the same manner as in Example 1 except that the mounting position of the cooling device was changed to 10 cm immediately below the keeping zone.
Example 3
The yarn was produced in the same manner as in Example 1 except that the yarn denier of 100 denier was used to produce 100de / 10f.
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 circumference of the hole of the cooling device was made 5 mm wider than that of the spinneret.
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 AL material film was changed from long to short from the position immediately after the cooling device to the position immediately after the cooling device.
Comparative Example 4
A yarn was produced in the same manner as in Example 1 except that the hole arrangement of the spinneret was changed from the W type to the I type.
(%)
(mm)
(mm)
(Times / ton)
(Times / kg)
(CV%)
As shown in Table 1, the polyester filament yarn produced according to the embodiment of the present invention has stable yarn by reducing yarn warpage and yarn breakage during production, so that there is no deviation between single yarns even at low fineness, .
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 facility
3: air jet nozzle 4: air supply engaging portion
5: insulating cover 6: cover film
Claims (7)
In the cooling device, there is a hole through which the thread can pass in a circular form, which is a cantilever shape, and the hole has a circle 10 mm wider than the circumference of the cantilever, and around the hole of the cooling device, five air- A UP-DOWN type cooling device arranged at equal intervals along the circumference is mounted to cool the discharged single yarn, and a film having a length from the cooling device to a lower portion of the cooling frame Thereby forming a closed zone in the cooling zone.
In the filament yarn, there is a hole through which yarn can pass in a circular form, which is a cantilever shape, and the hole has a circular shape 10 mm wider than the circumference of the cantilever, and around the hole of the cooling device, five air- (Upper to lower flow) type cooling device arranged at equal intervals along the longitudinal direction of the cooling frame to cool the discharged single yarn and to attach a film having a length from the cooling device to the lower portion of the cooling frame And a closed zone of the cooling zone is closed so that the value of the deviation of fineness between the filaments of the yarn is greater than 0 and not more than 1.00% as CV%.
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| KR1020140108301A KR101673670B1 (en) | 2014-08-20 | 2014-08-20 | Preparing process of the yarn for shielding electromagnetic waves |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100845096B1 (en) * | 2007-06-08 | 2008-07-09 | 도레이새한 주식회사 | Process for preparing the polyester hollow dividing yarn and the drawing yarn produced by the same process |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62184107A (en) * | 1986-02-05 | 1987-08-12 | Unitika Ltd | Cooling method in melt-spinning process |
| TWI221489B (en) | 2002-09-05 | 2004-10-01 | Nanya Plastics Corp | Manufacturing method for polyester yarn having high denier in monofilament polyester yarn process |
| KR101033209B1 (en) | 2004-12-31 | 2011-05-06 | 주식회사 효성 | A process for preparing polyester multifilamant for yarn diving having injection |
| KR101133896B1 (en) * | 2009-07-13 | 2012-04-09 | 도레이첨단소재 주식회사 | Polyester dividing yarn having an improved dividing property and a manufacturing method thereof |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100845096B1 (en) * | 2007-06-08 | 2008-07-09 | 도레이새한 주식회사 | Process for preparing the polyester hollow dividing yarn and the drawing yarn produced by the same process |
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