KR20030004759A - Extruding/foaming apparatus and extruding/foaming method of resin for coaxial cable using gas - Google Patents
Extruding/foaming apparatus and extruding/foaming method of resin for coaxial cable using gas Download PDFInfo
- Publication number
- KR20030004759A KR20030004759A KR1020010040414A KR20010040414A KR20030004759A KR 20030004759 A KR20030004759 A KR 20030004759A KR 1020010040414 A KR1020010040414 A KR 1020010040414A KR 20010040414 A KR20010040414 A KR 20010040414A KR 20030004759 A KR20030004759 A KR 20030004759A
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- South Korea
- Prior art keywords
- copper wire
- resin
- outer diameter
- molten resin
- coated
- Prior art date
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- 239000011347 resin Substances 0.000 title claims abstract description 98
- 229920005989 resin Polymers 0.000 title claims abstract description 98
- 238000005187 foaming Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 60
- 239000011248 coating agent Substances 0.000 claims abstract description 21
- 238000000576 coating method Methods 0.000 claims abstract description 21
- 238000001125 extrusion Methods 0.000 claims abstract description 19
- 238000004804 winding Methods 0.000 claims abstract description 6
- 239000006260 foam Substances 0.000 claims abstract description 5
- 238000004519 manufacturing process Methods 0.000 claims abstract description 3
- 239000012212 insulator Substances 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 8
- 239000001273 butane Substances 0.000 claims description 6
- 239000004020 conductor Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 6
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 claims description 6
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 229920001903 high density polyethylene Polymers 0.000 claims description 3
- 239000004700 high-density polyethylene Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 229920001684 low density polyethylene Polymers 0.000 claims description 3
- 239000004702 low-density polyethylene Substances 0.000 claims description 3
- 238000005728 strengthening Methods 0.000 claims description 3
- 230000001678 irradiating effect Effects 0.000 claims 1
- 238000007664 blowing Methods 0.000 abstract 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 239000006261 foam material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0012—Combinations of extrusion moulding with other shaping operations combined with shaping by internal pressure generated in the material, e.g. foaming
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Processes Specially Adapted For Manufacturing Cables (AREA)
Abstract
Description
본 발명은 가스를 이용하여 수지를 발포하여 압출하는 가스를 이용한 동축케이블용 수지의 발포/압출장치 및 그 발포/압출방법에 관한 것이다.The present invention relates to a foaming / extrusion apparatus for a resin for a coaxial cable using a gas for foaming and extruding a resin using a gas, and a foaming / extrusion method thereof.
도체인 동선에는 절연체인 피복이 입혀져 있다. 상기 피복은 작은 기포(氣泡)가 무수히 형성된 다공성(多孔性)을 가지는데, 다공성으로 인하여 절연체인 상기 피복이 고주파 영역에서 저손실성, 내열성 및 내굴곡성을 가진다. 상기 피복이 다공성을 가지게 기포를 형성하는 것을 발포(發泡)라고 하는데, 종래에는 절연체인 피복 자체의 재질을 발포성을 갖는 재질을 사용하여 동선에 피복을 입혔다. 그런데, 발포성을 갖는 피복은 고가이므로 인하여 비경제적인 단점이 있다.Copper wire, which is a conductor, is coated with an insulator sheath. The coating has a porosity in which numerous bubbles are formed. Due to the porosity, the coating, which is an insulator, has low loss resistance, heat resistance, and bending resistance in the high frequency region. It is called foaming to form bubbles in such a way that the coating has a porosity. Conventionally, a coating of copper wire is made by using a material having foamability as the material of the coating itself as an insulator. By the way, the coating having a foamability is expensive and there is an uneconomical disadvantage.
본 발명은 상기와 같은 문제점을 해결하기 위하여 창작된 것으로, 본 발명의 목적은 절연체인 용융수지에 가스를 주입하여 수지를 발포시키므로써, 원가를 절감할 수 있는 가스를 이용한 동축케이블용 수지의 발포/압출장치 및 그 발포/압출방법을 제공함에 있다.The present invention was created to solve the above problems, an object of the present invention is to foam the resin by injecting gas into the molten resin as an insulator, foaming of the resin for the coaxial cable using a gas that can reduce the cost An extrusion device and its foaming / extrusion method are provided.
도 1은 본 발명의 일 실시예에 따른 발포/압출장치의 구성을 보인 도.1 is a view showing the configuration of the foaming / extrusion apparatus according to an embodiment of the present invention.
도 2는 본 발명의 일 실시예에 따른 발포/압출방법을 보인 플로우챠트.2 is a flow chart showing a foaming / extrusion method according to an embodiment of the present invention.
* 도면의 주요부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings
10 : 보빈20 : 인취기10: bobbin 20: take-out machine
30 : 권취기40 : 코팅기30: winding machine 40: coating machine
50 : 송풍기61,63 : 제 1,2 압출기50 blower 61,63 first and second extruders
65 : 가스주입기71 : 외경측정기65 gas injector 71 outer diameter measuring instrument
75 : 외경보정기77 : 모터75: outer diameter corrector 77: motor
81,85 : 제 1,2 수조81,85: First and second tank
상기 목적을 달성하기 위한 본 발명에 따른 가스를 이용한 동축케이블용 수지의 발포/압출장치는, 도체인 동선(銅線)이 감겨서 보관되는 보빈; 상기 제어부의 제어에 의하여 상기 보빈에 감긴 상기 동선을 당겨서 이동시키는 인취기(引取機); 상기 인취기에 의하여 당겨져서 이동되는 상기 동선을 감아서 저장하는 권취기(券取機); 상기 보빈과 상기 인취기 사이에 마련되고 코팅재가 투입되며, 상기 인취기에 의하여 당겨져서 이동되는 상기 동선을 코팅시키는 코팅기; 상기 코팅기와 상기 인취기 사이에 마련되어 상기 코팅된 동선을 냉각시키는 송풍기; 절연체인 수지를 가열하여 용융시킨 후, 압출(壓出)하는 제 1 압출기; 상기 제 1 압출기에서 압출되는 상기 용융수지가 압력강화에 의하여 1차 발포되도록 상기 제 1 압출기로 가스를 균일하게 주입하는 가스주입기; 상기 송풍기와 인취기 사이에 마련되고 상기 제 1 압출기로부터 1차 발포된 상기 용융수지를 전달받아 압출하여 2차 발포하며, 상기 코팅된 동선에 2차 발포된 상기 용융수지를 입히는 제 2 압출기; 상기 제 2 압출기와 상기 인취기 사이에 마련되며 적소에 설치된 제어부의 제어에 의하여 2차 발포된 상기 용융수지가 입혀진 상기 동선의 외경을 측정하여 보정한 후 동축케이블을 제조하는 외경측정/보정부; 상기 외경측정/보정부와 상기 인취기 사이에 마련되어 상기 동축케이블을 냉각시키는 수조를 구비한다.A foaming / extrusion apparatus for a resin for a coaxial cable using a gas according to the present invention for achieving the above object comprises: a bobbin in which a copper wire, which is a conductor, is wound and stored; A puller for pulling and moving the copper wire wound on the bobbin under the control of the controller; A winder for winding and storing the copper wire that is pulled and moved by the take-up machine; A coating machine provided between the bobbin and the injector and coated with a coating material to coat the copper wire that is pulled and moved by the injector; A blower provided between the coater and the taker to cool the coated copper wire; A first extruder extruded after heating and melting a resin which is an insulator; A gas injector for uniformly injecting gas into the first extruder such that the molten resin extruded from the first extruder is first foamed by pressure strengthening; A second extruder provided between the blower and the take-off machine and receiving the extruded molten resin firstly from the first extruder and extruding the secondary resin to coat the molten resin secondaryly foamed on the coated copper wire; An outer diameter measurement / correction part provided between the second extruder and the take-out machine and manufacturing a coaxial cable after measuring and correcting the outer diameter of the copper wire coated with the molten resin secondary foamed by the control of a control unit installed in place; And a water tank provided between the outer diameter measuring / correcting portion and the take-in machine to cool the coaxial cable.
상기 목적을 달성하기 위한 본 발명에 따른 가스를 이용한 동축케이블용 수지의 발포/압출방법은, 절연체인 수지를 가열하여 용융시키고, 상기 용융된 수지에 가스를 주입하는 단계; 도체인 동선을 코팅하여 냉각시키는 단계; 상기 가스가 융합된 상기 용융수지가 발포되도록 압출시키고, 상기 발포된 용융수지를 상기 코팅된 동선에 입히는 단계; 상기 발포된 용융수지가 입혀진 상기 동선의 외경을 측정하는 단계; 상기 측정된 외경이 설정치의 범위 밖에 존재하면 보정하는 단계; 상기 설정치의 범위 내에 존재하는 상기 발포된 용융수지가 입혀진 상기 동선 및 보정된 상기 발포된 용융수지가 입혀진 상기 동선을 냉각시키는 단계를 수행한다.Foaming / extrusion method of the resin for the coaxial cable using the gas according to the present invention for achieving the above object, the step of heating and melting the resin which is an insulator, injecting gas into the molten resin; Coating and cooling the conductor copper wire; Extruding the molten resin in which the gas is fused to foam and coating the foamed molten resin on the coated copper wire; Measuring an outer diameter of the copper wire coated with the foamed molten resin; Correcting if the measured outer diameter is outside the set range; Cooling the copper wire coated with the foamed molten resin present and within the range of the set value and the corrected copper wire coated with the expanded molten resin.
이하, 첨부한 도면을 참조하여 본 발명의 일 실시예에 따른 가스를 이용한 동축케이블용 수지의 발포/압출장치 및 그 발포/압출방법을 상세히 설명한다.Hereinafter, with reference to the accompanying drawings will be described in detail the foaming / extrusion device and the foaming / extrusion method of the resin for the coaxial cable using the gas according to an embodiment of the present invention.
도 1은 본 발명의 일 실시예에 따른 발포/압출장치의 구성을 보인 도이다.1 is a view showing the configuration of the foaming / extrusion apparatus according to an embodiment of the present invention.
도시된 바와 같이, 도체인 동선(銅線)이 감겨서 보관되는 보빈(10)과보빈(10)에 감긴 상기 동선을 당겨서 이동시키는 인취기(引取機)(20)와 인취기(20)에 의하여 당겨져서 이동되는 상기 동선을 감아서 저장하는 권취기(券取機)(30)가 마련된다.As shown in the drawing, the bobbin 10 and the drawer 20 for pulling and moving the copper wire wound on the bobbin 10 and the copper wire wound on the conductor are wound and stored. The winding machine 30 which winds and stores the said copper wire pulled and moved is provided.
그리고, 보빈(10)과 인취기(20) 사이에는 코팅기(40)가 설치된다. 코팅기(40)는 코팅재가 투입되는 투입구(41)와 코팅재가 토출되는 헤드부(43)를 가진다. 인취기(20)에 의하여 당겨져서 이동되는 상기 동선은 코팅기(40)의 헤드부(43)를 통과하는데, 이로인해 상기 동선이 코팅된다.In addition, a coating machine 40 is installed between the bobbin 10 and the take-off machine 20. The coater 40 has an inlet opening 41 through which the coating material is injected and a head part 43 through which the coating material is discharged. The copper wire that is pulled and moved by the intake machine 20 passes through the head portion 43 of the coater 40, whereby the copper wire is coated.
그리고, 코팅기(40)와 인취기(20) 사이에는 상기 코팅된 동선을 냉각시키는 송풍기(50)가 마련되고, 송풍기(50)와 인취기(20) 사이에는 발포/압출기(60)가 마련된다.In addition, a blower 50 for cooling the coated copper wire is provided between the coater 40 and the intake machine 20, and a foaming / extruder 60 is provided between the blower 50 and the intake machine 20. .
발포/압출기(60)는 제 1 압출기(61), 제 2 압출기(63) 및 가스주입기(65)를 가진다. 제 1 압출기(61)의 전단부측과 제 2 압출기(63)의 상단부측은 상호 연통되고, 제 1 압출기(61)의 중앙부측과 가스주입기(65)는 상호 연통된다. 그리고, 제 1 압출기(61)의 후단부측에는 수지가 주입되는 주입구(61a)가 형성되고, 제 2 압출기(63)의 하단부측에는 상기 냉각된 동선이 통과하는 헤드부(63a)가 마련된다.The foaming / extruder 60 has a first extruder 61, a second extruder 63 and a gas injector 65. The front end side of the first extruder 61 and the upper end side of the second extruder 63 communicate with each other, and the central part side of the first extruder 61 and the gas injector 65 communicate with each other. An injection port 61a through which resin is injected is formed on the rear end side of the first extruder 61, and a head portion 63a through which the cooled copper wire passes is provided on the lower end side of the second extruder 63.
그리하여, 주입구(61a)를 통하여 제 1 압출기(61)로 유입된 수지는 가열되어 용융되고, 가스주입기(65)는 상기 용융된 수지가 저장된 제 1 압출기(61)로 가스를 주입한다. 그러면, 제 1 압출기(61)의 내부에서 용융된 수지에 상기 가스가 균일하게 융합되어 제 2 압출기(63)측으로 압출된다. 상기 가스가 융합된 용융수지가 제 1 압출기(61)에서 제 2 압출기(63)측으로 압출되면서 전달되면 압력강하가 발생하게 되고, 이로인해 기화한 가스가 팽창되면서 용융수지에 기포가 발생하여 발포되게 된다. 균일한 발포가 되게 하기 위해서는 정량의 가스를 주입하여야 하고, 용융수지의 흐름이 일정하도록 하여야 한다. 발포압출기(60)에 사용되는 수지는 고밀도폴리에틸렌수지와 저밀도폴리에틸렌수지를 1 : 1 혼합한 수지이며, 가스는 액체가스인 부탄이 사용된다.Thus, the resin introduced into the first extruder 61 through the injection port 61a is heated and melted, and the gas injector 65 injects gas into the first extruder 61 in which the molten resin is stored. Then, the gas is uniformly fused to the resin melted in the first extruder 61 and extruded toward the second extruder 63. When the molten resin in which the gas is fused is delivered while being extruded from the first extruder 61 to the second extruder 63, a pressure drop is generated, and as a result, bubbles are generated and foamed in the molten resin as the vaporized gas is expanded. do. In order to achieve uniform foaming, a certain amount of gas should be injected and the flow of molten resin should be constant. The resin used in the foaming extruder 60 is a resin obtained by mixing 1: 1 a high density polyethylene resin and a low density polyethylene resin, and a gas such as butane, which is a liquid gas, is used.
그리고, 제 2 압출기(63)로 전달된 발포된 용융수지는 2차로 발포되면서 헤드부(63a)측으로 압출되고, 이로인해 헤드부(63a)를 통과하는 상기 동선에 상기 발포된 용융수지가 입혀진다. 제 2 압출기(63)는 온도를 조정하고 압출량을 안정화시키는 작용을 한다.Then, the foamed molten resin delivered to the second extruder 63 is secondly foamed and extruded toward the head portion 63a, whereby the foamed molten resin is coated on the copper wire passing through the head portion 63a. . The second extruder 63 serves to adjust the temperature and stabilize the extrusion amount.
제 2 압출기(63)와 인취기(20) 사이에는 외경측정/보정부(70)가 설치되는데, 외경측정/보정부(70)는 상기 발포된 용융수지가 입혀진 상기 동선의 외경을 측정하는 외경측정기(71)와 외경측정기(71)의 신호를 전달받아 상기 발포된 용융수지가 입혀진 상기 동선의 외경을 보정하는 외경보정기(75)와 외경보정기(75)를 직선운동시키는 모터(77)를 포함한다.An outer diameter measurement / correction unit 70 is installed between the second extruder 63 and the take-out machine 20, and the outer diameter measurement / correction unit 70 measures an outer diameter of the copper wire coated with the foamed molten resin. Receiving signals from the measuring device 71 and the outer diameter measuring device 71 includes an outer diameter corrector 75 for correcting the outer diameter of the copper wire coated with the foamed molten resin and a motor 77 for linearly moving the outer diameter corrector 75. do.
외경측정/보정부(70)의 작용을 설명하면, 외경측정기(71)는 상기 발포된 용융수지가 입혀진 상기 동선으로 레이저를 조사하고, 조사된 레이저를 수신하여 상기 발포된 용융수지가 입혀진 상기 동선의 외경을 측정한다. 그후, 측정된 외경의 크기를 제어부(미도시)로 송신하면, 상기 제어부는 외경의 설정치와 외경의 측정치를 비교한다. 이때, 측정치가 설정치 보다 크면 상기 제어부는 모터(77)를 구동시켜 소정 위치에 설치된 외경보정기(75)를 제 2 압출기(63)측으로 이동시킨다. 그러면, 상기 동선에 입혀진 상기 발포된 용융수지는 적게 발포되어 외경보정기(75)의 통과공(75a)가 통과한다. 즉, 상기 소정 위치에서 제 2 압출기(63)측으로 이동된 외경보정기(75)의 통과공(75a)을 통과하는 상기 동선에 입혀진 상기 용융수지는 상기 소정 위치에 설치된 외경보정기(75)의 통과공(75a)을 통과하는 상기 동선에 입혀진 상기 용융수지 보다 적게 발포된다. 용융수지가 더 적게 발포되면 상기 용융수지가 입혀진 상기 동선의 외경이 작은 것을 의미하므로, 상기 소정 위치에서 제 2 압출기(63)측으로 이동된 외경보정기(75)의 통과공(75a)을 통과하는 상기 발포된 용융수지가 입혀진 상기 동선의 외경은 측정치 보다 작은 상태로 외경보정기(75)의 통과공(75a)을 통과한다. 이리하여, 상기 용융수지가 입혀진 상기 동선의 외경이 보정된다.Explaining the operation of the outer diameter measuring / correction part 70, the outer diameter measuring device 71 irradiates a laser beam to the copper wire coated with the foamed molten resin, and receives the irradiated laser beam to coat the foamed molten resin with the copper wire. Measure the outer diameter of. Thereafter, when the size of the measured outer diameter is transmitted to the controller (not shown), the controller compares the set value of the outer diameter with the measured value of the outer diameter. At this time, if the measured value is larger than the set value, the controller drives the motor 77 to move the outer diameter corrector 75 installed at a predetermined position to the second extruder 63 side. Then, the foamed molten resin coated on the copper wire is less foamed so that the passage hole 75a of the outer diameter corrector 75 passes. That is, the molten resin coated on the copper wire passing through the through hole 75a of the outer diameter corrector 75 moved from the predetermined position to the second extruder 63 side passes through the outer diameter corrector 75 installed at the predetermined position. Less foamed than the molten resin coated on the copper wire passing through 75a. When the molten resin is foamed less, it means that the outer diameter of the copper wire coated with the molten resin is smaller, so that the molten resin passes through the through hole 75a of the outer diameter corrector 75 moved to the second extruder 63 at the predetermined position. The outer diameter of the copper wire coated with the foamed molten resin passes through the through hole 75a of the outer diameter corrector 75 in a state smaller than the measured value. Thus, the outer diameter of the copper wire coated with the molten resin is corrected.
그리고, 측정치가 설정치 보다 작으면 상기 제어부는 모터(77)를 구동시켜 소정 위치에 설치된 외경보정기(75)를 인취기(20)측으로 이동시킨다. 그러면, 상기 동선에 입혀진 상기 발포된 용융수지는 많이 발포되어 외경보정기(75)의 통과공(75a)을 통과한다. 이로인해, 상기 발포된 용융수지가 입혀진 상기 동선의 외경은 측정치 보다 큰 상태로 외경보정기(75)의 통과공(75a)을 통과하면서, 그 외경이 보정된다.If the measured value is smaller than the set value, the controller drives the motor 77 to move the outer diameter corrector 75 installed at the predetermined position to the take-off 20 side. Then, the foamed molten resin coated on the copper wire is foamed a lot and passes through the through hole 75a of the outer diameter corrector 75. Thus, the outer diameter of the copper wire coated with the foamed molten resin passes through the through hole 75a of the outer diameter corrector 75 in a state larger than the measured value, and the outer diameter thereof is corrected.
모터(77)와 외경보정기(75)는 일반적인 체인 또는 기어 등과 같은 동력변환수단을 매체로 연결되고, 이로인해 외경보정기(75)가 직선왕복운동한다. 상기 동력변환수단에 대하여는 도면에 도시하지 않는다.The motor 77 and the outer diameter corrector 75 are connected to the medium by a power conversion means such as a general chain or gear, so that the outer diameter corrector 75 linearly reciprocates. The power conversion means is not shown in the figure.
이하, 외경보정기(75)를 통과한 상기 용융수지가 입혀진 상기 동선을 동축케이블이라 한다.Hereinafter, the copper wire coated with the molten resin passing through the outer diameter corrector 75 is referred to as a coaxial cable.
외경보정기(75)와 인취기(20) 사이에는 상기 동축케이블을 냉각시키는 제 1 및 제 2 수조(81,85)가 설치된다. 제 1 및 제 2 수조(81,85)에서 냉각된 상기 동축케이블은 인취기(20)에 의하여 당겨져서 권취기(30)에 감겨서 저장된다.First and second tanks 81 and 85 for cooling the coaxial cable are installed between the outer diameter corrector 75 and the take-up machine 20. The coaxial cable cooled in the first and second water tanks 81 and 85 is pulled by the take-up machine 20 and wound around the take-up machine 30 and stored.
본 실시예에 따른 동축케이블용 수지의 발포/압출방법을 도 1 및 도 2를 참조하여 설명한다. 도 2는 본 발명의 일 실시예에 따른 발포/압출방법을 보인 플로우챠트이다.The foaming / extrusion method of the resin for the coaxial cable according to the present embodiment will be described with reference to FIGS. 1 and 2. 2 is a flow chart showing a foaming / extrusion method according to an embodiment of the present invention.
도시된 바와 같이, 단계(S11)에서는 보빈(10)에 감겨있는 동선을 인취기(20)를 이용하여 당기면서 상기 동선에 코팅을 하고, 송풍기(50)를 이용하여 1차 냉각시킨다(S15). 그리고, 단계(S21)에서는 제 1 압출기(61)에 고밀도폴리에틸렌수지와 저밀도폴리에틸렌수지를 1 : 1의 비율로 넣고, 상기 수지를 가열하여 용융시킴과 동시에 제 1 압출기(61)로 액체인 부탄가스를 넣어서 상기 용융수지와 부탄가스를 융합시킨다(S25). 그후, 단계(S31,S35)에서는 상기 부탄가스가 융합된 상기 용융수지를 제 1 압출기(61) 및 제 2 압출기를 이용하여 압출한다. 그러면, 압력강화에 의하여 상기 용융수지에 융합된 상기 부탄가스가 기화되면서 기포가 발생한다. 그러면, 상기 용융수지가 발포된다.As shown, in step S11, the copper wire wound on the bobbin 10 is coated using the intake machine 20 to coat the copper wire, and the primary cooling is performed by using the blower 50 (S15). . In step S21, a high density polyethylene resin and a low density polyethylene resin are added to the first extruder 61 at a ratio of 1: 1, and the resin is heated and melted, and at the same time, the butane gas is a liquid in the first extruder 61. Put the molten resin and butane gas to fuse (S25). Thereafter, in steps S31 and S35, the molten resin in which the butane gas is fused is extruded using a first extruder 61 and a second extruder. Then, bubbles are generated while the butane gas fused to the molten resin is vaporized by pressure intensification. Then, the molten resin is foamed.
그후, 단계(S40)에서는 상기 발포된 용융수지를 코팅된 상기 동선에 입히고, 단계(S51)에서는 상기 용융수지가 입혀진 상기 동선의 외경을 측정하여 설정치와 비교한다. 그리하여, 상기 용융수지가 입혀진 상기 동선의 외경이 설정된 범위 밖에 존재하면, 전술한 바와 같이 외경보정기(75)를 이동시켜 외경을 보정하는단계(S55)를 수행한 후, 상기 동축케이블을 2차 및 3차 냉각시킨다.(S61,S65)Thereafter, in step S40, the foamed molten resin is coated on the coated copper wire, and in step S51, the outer diameter of the copper wire coated with the molten resin is measured and compared with the set value. Thus, if the outer diameter of the copper wire coated with the molten resin is outside the set range, as described above, after performing the step (S55) to correct the outer diameter by moving the outer diameter corrector 75, the coaxial cable secondary and 3rd cooling (S61, S65)
그리고, 상기 용융수지가 입혀진 상기 동선의 외경이 설정된 범위 내에 존재하면, 외경보정기(75)의 위치를 변경시키지 않은 상태에서 상기 용융수지가 입혀진 상기 동선을 외경보정기(75)의 통과공(75a)에 통과시킨다. 그후, 상기 동축케이블을 2차 및 3차 냉각시킨다(S61,S65).When the outer diameter of the copper wire coated with the molten resin is within the set range, the through hole 75a of the outer diameter corrector 75 passes the copper wire coated with the molten resin without changing the position of the outer diameter corrector 75. Pass it on. Thereafter, the coaxial cable is cooled secondary and tertiary (S61, S65).
이상에서 설명하듯이, 본 발명에 따른 가스를 이용한 동축케이블용 수지의 발포/압출장치 및 그 발포/압출방법은 가스를 용융수지에 주입하여 압출시키면, 압력강화에 의하여 가스가 기화되면서 용융수지를 발포시킨다. 그러므로, 종래의 발포재인 용융수지에 비하여 훨씬 경제적이다.As described above, the foaming / extrusion apparatus and the foaming / extrusion method of the resin for the coaxial cable using the gas according to the present invention, when the gas is injected into the molten resin and extruded, the gas is vaporized by the pressure strengthening, the molten resin Foam. Therefore, it is much more economical than the molten resin which is a conventional foam material.
그리고, 외경측정기 및 외경보정기에 의하여 항상 설정된 범위 내에 존재하는 동축케이블이 제조되므로 제품의 신뢰성이 향상된다.In addition, since the coaxial cable is always present in the set range by the outer diameter measuring instrument and the outer diameter corrector, the reliability of the product is improved.
이상에서는, 본 발명의 일 실시예에 따라 본 발명을 설명하였지만, 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자가 본 발명의 기술적 사상을 벗어나지 않는 범위 내에서 변경 및 변형한 것도 본 발명에 속함은 당연하다.In the above, the present invention has been described in accordance with one embodiment of the present invention, but those skilled in the art to which the present invention pertains have been changed and modified without departing from the spirit of the present invention. Of course.
Claims (5)
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| KR820001856Y1 (en) * | 1981-08-04 | 1982-09-01 | Daihan Electric Wire Co Ltd | Tapping device for cable manufactor |
| JPH0525546Y2 (en) * | 1989-08-11 | 1993-06-28 | ||
| JPH065139A (en) * | 1992-06-19 | 1994-01-14 | Sumitomo Electric Ind Ltd | Manufacture of low density foam insulating wire |
| JPH06309970A (en) * | 1993-04-21 | 1994-11-04 | Fujikura Ltd | Manufacture of electric wire covered with foaming fluorinated resin |
| JP3576590B2 (en) * | 1994-03-09 | 2004-10-13 | 株式会社オーシーシー | High foam coaxial cable manufacturing equipment |
| JP3605136B2 (en) * | 1994-03-09 | 2004-12-22 | 株式会社オーシーシー | High foam polyethylene coaxial cable manufacturing method |
| JPH08249958A (en) * | 1995-03-15 | 1996-09-27 | Kobe Steel Ltd | Method and equipment for manufacturing foamed insulation electric wire |
| JPH09129055A (en) * | 1995-10-31 | 1997-05-16 | Fujikura Ltd | Manufacture of strong foaming insulated wire |
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