KR19990004028U - Synthetic Resin Double Wall Smoothing Pipe Manufacturing Equipment - Google Patents
Synthetic Resin Double Wall Smoothing Pipe Manufacturing Equipment Download PDFInfo
- Publication number
- KR19990004028U KR19990004028U KR2019980019702U KR19980019702U KR19990004028U KR 19990004028 U KR19990004028 U KR 19990004028U KR 2019980019702 U KR2019980019702 U KR 2019980019702U KR 19980019702 U KR19980019702 U KR 19980019702U KR 19990004028 U KR19990004028 U KR 19990004028U
- Authority
- KR
- South Korea
- Prior art keywords
- pipe
- double
- synthetic resin
- cooling
- cooling device
- Prior art date
Links
- 229920003002 synthetic resin Polymers 0.000 title claims abstract description 16
- 239000000057 synthetic resin Substances 0.000 title claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 title abstract description 17
- 238000009499 grossing Methods 0.000 title description 2
- 238000001816 cooling Methods 0.000 claims abstract description 26
- 239000000463 material Substances 0.000 claims abstract description 25
- 239000000853 adhesive Substances 0.000 claims abstract description 23
- 230000001070 adhesive effect Effects 0.000 claims abstract description 23
- 238000001125 extrusion Methods 0.000 claims abstract description 21
- 238000005304 joining Methods 0.000 claims abstract description 10
- 238000002788 crimping Methods 0.000 claims abstract description 4
- 239000002390 adhesive tape Substances 0.000 abstract description 4
- 238000004804 winding Methods 0.000 abstract description 4
- 238000009434 installation Methods 0.000 abstract 1
- 239000000498 cooling water Substances 0.000 description 3
- 230000004927 fusion Effects 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 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
- B29C48/0011—Combinations of extrusion moulding with other shaping operations combined with compression moulding
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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
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
-
- 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
- B29C48/9115—Cooling of hollow articles
-
- 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
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
- B29C65/52—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the way of applying the adhesive
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D23/00—Producing tubular articles
- B29D23/001—Pipes; Pipe joints
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
본 고안은 예비적으로 냉각된 후 권회되는 관재의 뒷벽과 앞벽 사이에 양면접착테이프의 역할을 하는 띠상 접착재에 의해 융착 접합하므로서 이중벽 평활관을 제조할 때 원주방향에서 향심방향으로 작용하는 외력과 축방향으로 작용하는 외력에 대한 응력이 우수하고, 접합 후 냉각에 소요되는 시간을 단축시켜 접합부에 I형 지지대를 형성하는 작업의 신속성을 기하기 위한 것으로서, 사각관형태로 압출되는 합성수지제 관재를 나선상으로 권회하면서 압착 접합하여 이중벽 평활관을 제조토록 하는 장치에 있어서, 관재 압출다이스(10)의 직후방에 관재용 냉각장치(11)를 설치하고, 상기 냉각장치(11)의 직후방에는 냉각장치(11)에 의하여 냉각된 냉각 관재(a')의 앞벽에 띠모양의 겔상으로 접착재(f)를 압출하는 접합재 압출다이스(12)를 설치하며, 접합재 압출다이스(12)의 후위에 공지의 나선상 권회접합용 드럼(20)을 설치한 합성수지제 이중벽 평활관 제조장치이다.The present invention is an external force and shaft acting in the circumferential direction from the circumferential direction when manufacturing a double-walled smooth pipe by fusion-bonding by a band-like adhesive that serves as a double-sided adhesive tape between the back wall and the front wall of the preliminarily cooled and wound pipe. It is excellent in stress against external force acting in the direction, and shortens the time required for cooling after joining, so as to speed up the work of forming an I type support part in the joining part. In the apparatus for producing a double-walled smooth pipe by crimping while winding with a pipe, a pipe cooling device (11) is provided immediately after the pipe extrusion die (10), and a cooling device immediately after the cooling device (11). On the front wall of the cooling pipe member (a ') cooled by (11), a bonding material extrusion die (12) for extruding the adhesive material (f) in a band-like gel is provided. Ex die is a succeeding double-walled synthetic resin smooth tube apparatus for manufacturing a spiral wound installation junction drum 20 for a known on 12.
Description
본 고안은 지중매설관으로 통용되는 합성수지제 이중벽 내압 평활관의 제조장치에 관한 것이며, 특히 예비적으로 냉각된 후 권회되는 관재의 뒷벽과 앞벽 사이에 양면접착테이프의 역할을 하는 띠상 접착재에 의해 융착 접합하므로서 이중벽 평활관을 제조할 때 원주방향에서 향심방향으로 작용하는 외력과 축방향으로 작용하는 외력에 대한 응력이 우수하고, 접합 후 냉각에 소요되는 시간을 단축시켜 접합부에 I형 지지대를 형성하는 작업의 신속성을 추구한 합성수지제 이중벽 평활관 제조장치에 관한 것이다.The present invention relates to a manufacturing apparatus of a double-wall internal pressure smoothing pipe made of synthetic resin commonly used as underground buried pipe, and is particularly fused by a band-like adhesive that serves as a double-sided adhesive tape between the back wall and the front wall of a pipe that is preliminarily cooled and then wound. When manufacturing double-walled smooth pipe by joining, it has excellent stress against external force acting in the circumferential direction and the axial direction, and shortens the time required for cooling after joining to form an I-type support in the joint. The present invention relates to a double-walled smooth pipe manufacturing apparatus made of synthetic resin in pursuit of speedy operation.
일반적으로 알려진 나선형 합성수지관은 도 1에 예시한 바와 같이 드럼의 원주피치간격으로 배치된 복수의 자전식 회전로울러(1)에 압출다이스에서 압출되는 합성수지제 중공형 관재(2)가 외접하도록 나선방향으로 권취하면서 앞 뒤 관재(2)의 접합살(3)이 겹쳐진 부위를 외부 압착로울러(4)로 눌러 붙이고 붙인 직후에는 호스(5,6)로 냉각수를 내뿜어 접합부를 냉각시키는 것으로 나선형 합성수지관을 제조하게 된다.A generally known spiral synthetic resin tube is spirally oriented so that a synthetic resin hollow tube (2) extruded from an extrusion die is circumscribed to a plurality of rotating rollers (1) arranged at circumferential pitch intervals of a drum as illustrated in FIG. The spiral synthetic resin pipe is cooled by blowing coolant with hoses 5 and 6 immediately after pressing and attaching the parts where the joints 3 of the front and rear pipe members 2 overlap with the external compression roller 4 while winding up. To manufacture.
이렇게 만들어진 나선형 합성수지관은 접합부가 강도적으로 취약하기 때문에 지중 매설시, 운반취급시 약간의 충격에도 쉽게 파손되는 결점이 있다. 이같은 단점을 감안하여 일찍이 접합부의 내압강도를 높일 수 있는 합성수지 이중벽 평활관 제조장치에 관한 연구가 있었다. 특허공보 제98-132649호에 개시된 합성수지관 제조장치가 그 대표적인 사례이다.Since the spiral synthetic resin tube is made of weak strength at the joints, the spiral synthetic resin pipe is easily broken even when there is a slight impact when buried in the ground. In view of these shortcomings, there has been a study on the manufacturing apparatus of the double-walled smooth pipe of synthetic resin that can increase the pressure resistance of the joint. Synthetic resin tube manufacturing apparatus disclosed in Patent Publication No. 98-132649 is a typical example.
이 선행기술은 압출다이스에서 압출돼 나오는 겔상의 중공형 관재를 드럼의 회전로울러군에 외접되도록 나선상으로 권취할 때 나중에 권회되는 관재의 앞면과 앞서 권회된 관재의 뒷면 사이에 2개의 노즐을 설치하여 안팍에서 동시에 겔상태의 접착재를 공급하여 압착로울러로 접합한 후 냉각수로 급냉시켜 이중벽 평활관으로 성형하는 것이다.This prior art is to install two nozzles between the front of the pipe wound later and the back of the previously wound pipe when spirally wound the gel-like hollow tube extruded from the extrusion die to circumscribe the drum roller At the same time, the gel-like adhesive material is supplied from the inner pack, and then bonded with a pressing roller, followed by quenching with cooling water to form a double wall smooth tube.
그러나 이 제조장치에서는 도 2에 나타난 바와 같이 중공부를 사이에 둔 관재(a)는 상부 플랜지(b)와 하부 플랜지(c), 앞벽(d) 및 뒷벽(e)으로 이뤄졌고, 이 관재를 회전로울러에 권취시킬 때 뒤에 권회되는 관재의 앞벽과 앞서 권회된 관재의 뒷벽 사이에 겔상태의 접착재(f)를 압착하여 융착시킨 후에 냉각수로 냉각시키므로서 압착융착 당시와 그 이후 냉각되기 전에 권회되는 동안에 접합부, 즉 앞서 권회된 관재의 뒷벽(e)과 곧이어 권회되는 관재의 앞벽(d)과 접착재(f) 및 상·하 플랜지(b,c)가 모두 겔상태로 압착 융착된 후 충분히 냉각되지 않은 상태에서 권취되는 경향이 있다.However, in this manufacturing apparatus, as shown in Fig. 2, the pipe member (a) between the hollow portion is composed of an upper flange (b), a lower flange (c), a front wall (d) and a rear wall (e), and the tube is rotated. The joints during the crimping and during the subsequent winding before being cooled by pressing and squeezing the gel-like adhesive (f) between the front wall of the later wound pipe and the back wall of the previously wound pipe by fusion and cooling with cooling water. In other words, the back wall (e) of the previously wound pipe and the front wall (d), the adhesive (f) and the upper and lower flanges (b, c) of the immediately wound pipe are not sufficiently cooled after being crimped and fused in a gel state. Tends to be wound on
이렇게 되면 원주방향에서 향심방향으로 작용하는 외력과 평활관의 축방향으로 작용하는 외력에 의하여 접착부가 I형을 유지하지 못하고 좌·우 어느 한 쪽으로 휘어지든가 쓰러지는 등 내압강도가 낮고, 이 점을 고려하여 접합부가 I형으로 유지되도록 하기 위해서는 충분한 냉각시간을 갖고 권취해야 하지만 그러다보면 단위시간당 생산량이 현격히 떨어지는 또 다른 문제점이 드러난다.In this case, due to the external force acting in the circumferential direction and the external force acting in the axial direction of the smooth pipe, the pressure-resistance strength is low, such as the adhesive part does not maintain the I-shape and collapses to either the left or the right. Therefore, in order to maintain the junction type I, it needs to be wound with sufficient cooling time, but this reveals another problem that the yield per unit time is significantly reduced.
본 고안은 상기와 같은 종래 평활관 제조장치의 문제점을 해소하기 위해 제안하는 것으로서, 예비적으로 냉각된 후 권회되는 관재의 뒷벽과 앞벽 사이에 양면접착테이프의 역할을 하는 띠상 접착재에 의해 융착 접합하므로서 이중벽 평활관을 제조할 때 원주방향에서 향심방향으로 작용하는 외력과 축방향으로 작용하는 외력에 대한 응력을 높이고, 접합 후 냉각에 소요되는 시간을 단축시켜 접합부에 I형 지지대를 형성하는 작업의 신속성을 추구하기 위하여, 사각관형태로 압출되는 합성수지제 관재를 나선상으로 권회하면서 압착 접합하여 이중벽 평활관을 제조토록 하는 장치에 있어서, 관재 압출다이스의 직후방에 관재용 냉각장치를 설치하고, 상기 냉각장치의 직후방에는 냉각장치에 의하여 냉각된 냉각 관재의 앞벽에 띠모양의 겔상으로 접착재를 압출하는 접합재 압출다이스를 설치하며, 접합재 압출다이스의 후위에 공지의 나선상 권회접합용 드럼을 설치한 합성수지제 이중벽 평활관 제조장치를 제공한다.The present invention proposes to solve the problems of the conventional smooth pipe manufacturing apparatus as described above, by fusion-bonding by a band-like adhesive that serves as a double-sided adhesive tape between the back wall and the front wall of the pipe material is pre-cooled and wound When manufacturing double-walled smooth pipe, increase the stress on the external force acting in the circumferential direction and the axial direction, and shorten the time required for cooling after joining to form the type I support at the joint. In order to produce a double-walled smooth pipe by crimping and squeezing a synthetic resin pipe that is extruded in the form of a square tube in a spiral shape, a cooling device for pipe is provided immediately after the pipe extrusion die, Immediately in front of the unit is a band-like gel adhering to the front wall of the cooling tube cooled by the chiller. Install the bonding material extrusion die for extrusion, providing a double-walled synthetic resin smooth tube manufacturing apparatus is installed a helical winding drum for joining known in the rear of an extrusion die bonding material.
도 1은 종래 합성수지제 나선관 제조장치의 일례도1 is an example of a conventional synthetic resin spiral tube manufacturing apparatus
도 2는 이중벽 평할관용 관재의 앞벽에 띠상 접착재가 접합된 경우의 예시도Figure 2 is an exemplary view when the band-like adhesive material is bonded to the front wall of the double wall flat pipe
도 3은 본 고안에 의한 이중벽 평활관 제조장치의 개략적 종단면도Figure 3 is a schematic longitudinal cross-sectional view of the double-walled smooth pipe manufacturing apparatus according to the present invention
도면의 주요부분에 대한 부호의 설명Explanation of symbols for main parts of the drawings
10 : 관재 압출다이스 11 : 관재 냉각장치10: pipe extrusion die 11: pipe cooling device
12 : 접착재 압출다이스 13 : 외부압착로울러12: adhesive material extrusion die 13: external compression roller
20 : 드럼 21 : 회전로울러20: drum 21: rotating roller
a : 관재 a' : 냉각 관재a: pipe material a ': cooling pipe material
f : 접합재f: bonding material
도 3에서, 압출다이스(10)의 직후에 냉각장치(11)를 설치한다. 압출다이스(10)에서 압출되는 관재(a)는 압출 후 곧바로 변형이 쉽지 않은 형태로 어느 정도 굳어져서 이후 앞쪽 관재의 뒷벽에 접착재를 매개체로 하여 융착할 때 앞벽의 형상은 물론 앞서 나선상으로 권회된 관재측 뒷벽의 형상까지도 일그러지지 않을 만큼 충분한 강도를 지니게 할 수가 있다.In Fig. 3, the cooling device 11 is provided immediately after the extrusion die 10. The pipe member (a) extruded from the extrusion die 10 is hardened to a degree that is not easily deformed immediately after extrusion, and is then wound in a spiral shape as well as the shape of the front wall when fusion-bonded to the rear wall of the front pipe via an adhesive. The shape of the back wall of the pipe can be made to have sufficient strength so as not to be distorted.
상기 냉각장치(11)의 후방에서 관재(a)의 앞벽쪽에는 접착재 압출다이스(12)를 설치한다. 접착재 압출다이스(12)는 관재(a)끼리의 융착에 소요되는 겔상의 접착재(f)를 압출하는 것이다.An adhesive material extrusion die 12 is installed on the front wall side of the pipe member a at the rear of the cooling device 11. The adhesive material extrusion dice 12 is for extruding the gel-like adhesive material f required for fusion of the pipe members a.
드럼(20)의 회전로울러(21)에 뒤따라 권회되는 관재의 앞벽(d)과 이 보다 한발 앞서 권회된 관재의 뒷벽(e)을 맞접합함에 있어서는 앞 뒤 관재 사이로 겔상태의 접착재를 공급하지 않고 냉각장치(11)를 통과하여 어느 정도 냉각된 냉각 관재(a')가 회전로울러(21)에 권회되기 직전, 즉 냉각장치(11)와 드럼(20)에 당도하기 전의 구간에서 접합재 압출다이스(12)에서 압출되는 접착재(f)가 기히 냉각된 관재(a')의 앞벽(d)에 그 높이와 같은 겔상태의 띠상 접착재(f)를 접착재 압출다이스(12)의 압출력으로 접착되도록 하고, 이것이 드럼(20)의 회전로울러(21)측에 감겨 나가게 하므로서 이중벽 평활관을 제조하게 된다.In abutting the front wall (d) of the pipe wound along the rotary roller 21 of the drum 20 and the back wall (e) of the pipe wound earlier, the gel adhesive is not supplied between the front and back pipes. In the section just before the cooling pipe a 'cooled to some extent through the cooling device 11 is wound on the rotary roller 21, that is, before it reaches the cooling device 11 and the drum 20, the bonding material extrusion dies ( The adhesive material f extruded in 12) is adhered to the front wall d of the cooled tube a 'by the extrusion force of the adhesive extrusion die 12 with a gel-like band-like material f having the same height. , This is wound around the rotating roller 21 side of the drum 20 to produce a double wall smooth tube.
앞서 권회된 관재의 접착재(f)가 접착되지 않은 뒷벽(e)이 뒤따라 권회되는 관재의 접착재(f)에 의해 접합될 때에는 후권회 관재의 접착재가 양면테이프와 같은 기능을 발휘하므로서 앞 뒤 권회 관재의 뒷벽과 앞벽을 융착 접합하게 된다.When the adhesive material (f) of the previously wound tube is joined by the adhesive material (f) of the wound tube followed by the non-bonded back wall (e), the adhesive material of the post wound tube exerts the same function as a double-sided tape, so The back wall and the front wall will be fusion bonded.
도면부호중 (14,15)는 접합부의 냉각용 냉각수를 분출하는 냉각호스, (16)은 모터를 표시한다.Reference numerals 14 and 15 in the drawing denote cooling hoses for ejecting cooling water for cooling the joints, and numeral 16 denotes a motor.
이상 설명한 바와 같은 이중벽 평활관 제조장치는 겔상태의 띠상 접착재가 접합 이전에 예비적으로 냉각된 후 권회되는 관재의 뒷벽과 앞벽 사이에 양면접착테이프의 역할을 하는 띠상 접착재에 의해 융착 접합되므로서 이중벽 평활관을 제조할 때 원주방향에서 향심방향으로 작용하는 외력과 축방향으로 작용하는 외력에 대한 응력이 대단히 우수하다. 따라서 관재의 모든 접합부가 접합도중에 앞벽·뒷벽이 좌우로 휜다든가 어느 한 쪽으로 쓰러지는 일없이 내압강도가 우수한 이중벽 평활관을 얻을 수 있고, 접합 후 냉각에 소요되는 시간이 종전보다도 짧게 걸리므로 접합부에 I형 지지대를 형성하는 작업이 신속해 단위시간당 생산량도 증대되는 부수효과를 가져 오게 된다.The double-walled smooth pipe manufacturing apparatus as described above is double-walled because the gel-like adhesive material is fusion-bonded by a band-like adhesive that acts as a double-sided adhesive tape between the back wall and the front wall of the pipe wound after preliminary cooling before joining. When manufacturing the smooth tube, the stress against the external force acting in the circumferential direction and the axial direction is very excellent. Therefore, it is possible to obtain a double-walled smooth tube with excellent pressure resistance without all the joints of the pipe joints falling to the left or right during joining, and the cooling time after joining is shorter than before. The work to form the mold support is quick, which has the side effect of increasing the output per unit time.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019980019702U KR19990004028U (en) | 1998-10-15 | 1998-10-15 | Synthetic Resin Double Wall Smoothing Pipe Manufacturing Equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019980019702U KR19990004028U (en) | 1998-10-15 | 1998-10-15 | Synthetic Resin Double Wall Smoothing Pipe Manufacturing Equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| KR19990004028U true KR19990004028U (en) | 1999-01-25 |
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ID=69710298
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019980019702U KR19990004028U (en) | 1998-10-15 | 1998-10-15 | Synthetic Resin Double Wall Smoothing Pipe Manufacturing Equipment |
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| Country | Link |
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| KR (1) | KR19990004028U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100343957B1 (en) * | 1999-06-30 | 2002-07-19 | 박기종 | Manufacturing method &the same apparatus of duplication wall pipe composit resin |
| KR100422901B1 (en) * | 2001-08-14 | 2004-03-12 | 일우산업 주식회사 | Method for producing a plastic pipe with double fly wall |
| KR100743217B1 (en) * | 2007-03-02 | 2007-07-27 | (주)명성화학 | Pipe of intensity improvement type |
-
1998
- 1998-10-15 KR KR2019980019702U patent/KR19990004028U/en not_active Application Discontinuation
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100343957B1 (en) * | 1999-06-30 | 2002-07-19 | 박기종 | Manufacturing method &the same apparatus of duplication wall pipe composit resin |
| KR100422901B1 (en) * | 2001-08-14 | 2004-03-12 | 일우산업 주식회사 | Method for producing a plastic pipe with double fly wall |
| KR100743217B1 (en) * | 2007-03-02 | 2007-07-27 | (주)명성화학 | Pipe of intensity improvement type |
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