KR101188654B1 - Boiler junction tube made from polypropylene random copolymer and polybutylene - Google Patents
Boiler junction tube made from polypropylene random copolymer and polybutylene Download PDFInfo
- Publication number
- KR101188654B1 KR101188654B1 KR1020100019983A KR20100019983A KR101188654B1 KR 101188654 B1 KR101188654 B1 KR 101188654B1 KR 1020100019983 A KR1020100019983 A KR 1020100019983A KR 20100019983 A KR20100019983 A KR 20100019983A KR 101188654 B1 KR101188654 B1 KR 101188654B1
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- KR
- South Korea
- Prior art keywords
- hose
- hot water
- metal
- screw
- threaded portion
- Prior art date
Links
- 229920001748 polybutylene Polymers 0.000 title claims abstract description 13
- -1 polybutylene Polymers 0.000 title claims abstract description 12
- 229920005630 polypropylene random copolymer Polymers 0.000 title claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 239000002184 metal Substances 0.000 claims abstract description 30
- 230000002787 reinforcement Effects 0.000 claims abstract description 12
- 229920003002 synthetic resin Polymers 0.000 claims abstract description 12
- 239000000057 synthetic resin Substances 0.000 claims abstract description 12
- 229920001169 thermoplastic Polymers 0.000 claims abstract description 6
- 239000004416 thermosoftening plastic Substances 0.000 claims abstract description 6
- 230000003014 reinforcing effect Effects 0.000 claims description 9
- 238000012856 packing Methods 0.000 claims description 5
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 4
- 239000004743 Polypropylene Substances 0.000 abstract description 2
- 229920001155 polypropylene Polymers 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract 1
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
- F24D3/1058—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system disposition of pipes and pipe connections
- F24D3/1066—Distributors for heating liquids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
- F16L19/02—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
- F16L19/04—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts using additional rigid rings, sealing directly on at least one pipe end, which is flared either before or during the making of the connection
- F16L19/043—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts using additional rigid rings, sealing directly on at least one pipe end, which is flared either before or during the making of the connection with additional sealing means
Abstract
본 발명은 열가소성 합성수지 소재인 폴리플로필렌 랜덤 공중합체(Polypropylene Random coplymer)(PPR) 또는 폴리부틸렌(polybutylene)(PB)을 원료로 하여 성형되는 온수 보일러용 온수 중계관의 개량에 관한 발명으로 보다 구체적인 것은, 열가소성 합성수지소재인 폴리프로필렌랜덤공중합체 또는 폴리부틸렌을 원료로하여 성형되는 온수보일러용 온수중계관체의 주벽에 용접되는 호스연결구의 중심에 금속제 보강나사관을 매설하되 그 수나사부가 호스연결구의 중심공 외측으로 노출되게 형성하고 보강나사관의 수나사부에 금속제 호스체결구의 암나사부가 나사조립되게 구성하여 결합의 견고성과 누출위험이 예방되도록 한 폴리프로필렌 랜덤 공중합체(ＰＰＲ)또는 폴리부틸렌(ＰＢ)을 원료로 하는 보일러용 온수중계관이다. The present invention relates to an improvement of a hot water boiler for a hot water boiler formed by using a polypropylene random coplymer (PPR) or polybutylene (PB), which is a thermoplastic synthetic resin material. Specifically, a metal reinforcement screw pipe is embedded in the center of the hose connector welded to the main wall of the hot water relay pipe for the hot water boiler formed by using polypropylene random copolymer or polybutylene which is a thermoplastic synthetic resin material. The polypropylene random copolymer (PPR) or polybutylene is formed so as to be exposed to the outside of the center hole of the reinforcement screw and the female threaded portion of the metal hose fastener is screwed to prevent the leakage and the risk of leakage. It is a hot water relay pipe for boilers using PPP) as a raw material.
Description
본 발명은 열가소성 합성수지 소재인 폴리플로필렌 랜덤 공중합체(Polypropylene Random coplymer)(PPR) 또는 폴리부틸렌(polybutylene)(PB)을 원료로 하여 성형되는 온수 보일러용 온수 중계관의 개량에 관한 발명으로 보다 구체적인 것은 폴리프로필렌 랜덤 공중합체 또는 폴리부틸렌을 소재로 하여 파이프 형상으로 온수중계관체를 성형하고 중심구멍 양단에 마개를 끼워 밀봉시키고 주벽을 따라 4~9개의 구멍을 뚫어서 각 구멍에 상기 중계관체와 같은 합성수지로 성형한 호스연결구의 접속부를 용접하고 상기 호스연결구에 온수 주입호스와 온수분배용 호스를 접속시켜 중계관체에 공급된 온수를 분배하도록 된 것에 있어서, 온수 중계관체의 주벽으로 접속되는 호스연결구의 중심공속에 금속제 보강나사관을 매설하여 상기 보강나사관의 수나사부가 호스연결구 본체 외면으로 돌출되는 수나사부를 형성하고 이에 접속되는 금속제 호스 체결구의 암나사부가 나사조립되어 견고한 나사조립이 이루어지고 동시에 나사조립부를 통해 온수가 누출되는 일이 없는 온수 중계관을 얻을 수 있게 만든 것이다.The present invention relates to an improvement of a hot water boiler for a hot water boiler formed by using a polypropylene random coplymer (PPR) or polybutylene (PB), which is a thermoplastic synthetic resin material. Specifically, a hot water relay tube is formed into a pipe shape using a polypropylene random copolymer or polybutylene, and is sealed by plugs at both ends of the central hole, and four to nine holes are drilled along the main wall. Hose connector connected to the main wall of the hot water relay body in which the hot water supplied to the relay pipe is distributed by welding the connection part of the hose connector molded from the same synthetic resin and connecting the hot water injection hose and the hot water distribution hose to the hose connector. The male threaded portion of the reinforcement screw pipe is embedded with a metal reinforcement screw pipe at the center of the hose. The male thread part protruding to the outer surface of the main body and the female threaded part of the metal hose fastener connected thereto are screwed to form a solid screw assembly and at the same time to obtain a hot water relay tube without leaking hot water through the screw assembly.
종래의 합성수지제 온수중계관은 중계관 본체의 주벽에 부착되는 호스연결구의 중심공에 암나사가 형성된 보강나사관체를 매설하고 보강나사관체의 암나사에 호스연결구의 수나사부를 나사조립하도록 구성되어 있기 때문에 호스연결구와 보강나사관체의 결합부를 통해 온수누출이 발생하는 요인이 되었고, 온수수압이 높을 경우 누출정도가 심화되어 즉시 보수를 해야 하는 불편을 초래하고 있었다.
The conventional synthetic resin hot water relay pipe is constructed by embedding a reinforcement threaded body having a female thread in the center hole of the hose connector attached to the main wall of the main body of the relay pipe, and screwing the male threaded portion of the hose connector to the female thread of the reinforcement threaded body. Hot water leakage was caused by the coupling part between the connector and the reinforcing screw tube, and when the hot water pressure was high, the leakage degree was intensified, causing immediate inconvenience to repair.
본 발명은 상기와 같은 종래의 불편을 개선하기 위하여 개발한 것으로 이를 첨부된 도면에 의거 상세히 설명하면 다음과 같다.
The present invention was developed in order to improve the conventional inconvenience as described above in detail with reference to the accompanying drawings as follows.
본 발명은 열가소성 합성수지소재인 폴리프로필렌랜덤공중합체 또는 폴리부틸렌을 원료로하여 성형되는 온수보일러용 온수중계관체의 주벽에 용접되는 호스연결구의 중심에 금속제 보강나사관을 매설하되 그 수나사부가 호스연결구의 중심공 외측으로 노출되게 형성하고 보강나사관의 수나사부에 금속제 호스체결구의 암나사부가 나사조립되게 구성하여 결합의 견고성과 누출위험이 예방되도록 한 것이다.
The present invention is to embed a metal reinforcing screw pipe in the center of the hose connector welded to the main wall of the hot water relay pipe for hot water boilers formed from polypropylene random copolymer or polybutylene, which is a thermoplastic synthetic resin material, the male thread portion of the hose connector It is formed to be exposed to the outside of the central hole of the reinforcement screw, and the female threaded portion of the metal hose fastener is screwed to the male threaded portion of the reinforcement screw tube to prevent the tightness of the coupling and the risk of leakage.
이와 같이 된 본 발명은 호스연결구의 중심공에 금속제보강나사관(가)를 매설하여 호스연결구 본체와 결합시키고 금속제 보강나사관의 일단이 호스연결구 본체의 끝에서 외부로 돌출되게하여 그 외주면에 수나사를 형성한 수나사부와 매설부의 경계부에 호스연결구의 내측벽이 결합하는 환상의 요입홈부를 형성했기 때문에 금속제 보강나사관을 호스연결구에 매설하면 매설부와 수나사부의 경계부에 있는 환상요입홈에 연결구의 내주벽이 연장결합되어 밀착부를 형성하므로 금속제 보강나사관체의 수나사부에 금속제 호스체결구의 암나사가 결합하면 암나사입구가 밀착부에 밀착하고 보강나사관의 수나사부끝은 금속제 호스체결구의 암나사부 내측에 장치된 오링형상의 패킹에 나사결합하므로 별도의 패킹을 끼우지 않아도 견고한 밀착결합이 이루어져 나사결합부에서의 누출의 위험이 없는 접속이 이루어지게 된다.
그리고 금속제 호스체결구의 호스결합부에는 호스삽입홈 외주에 수나사부가 형성되어 체결너트가 나사조립되고 체결너트내면과 호스 외면 사이에 조임링이 개입되어 있으므로 조임링이 체결너트 내면에 형성된 경사홈에 접촉하여 체결너트가 나사조립됨에 따라 조여지도록 되기 때문에 호스체결구와 체결너트를 긴밀하게 나사조립시킬 수 있는 이점이 있도록 된다.
따라서 호스연결구에 금속제 호스체결구를 나사조립함에 있어서 금속제보강나사관의 수나사부와 금속제 호스체결구의 암나사가 나사조립되어 견고성과 기밀성을 만족시킬 수 있는 결합이 이루어지므로 내구성과 누수가 방지되는 효과를 얻을 수 있다.
In the present invention, the metal reinforcing screw tube (A) is embedded in the center hole of the hose connector to be coupled to the hose connector body and one end of the metal reinforcing screw tube protrudes outward from the end of the hose connector body to the external thread on its outer peripheral surface. Since the inner wall of the hose connector is formed at the boundary between the male thread part and the buried part, which is formed in the inner part of the hose connector, when the metal reinforcing screw pipe is embedded in the hose connector, the connector is connected to the annular groove in the boundary part of the buried part and the male thread part. The inner circumferential wall of the joint is extended to form a close contact, so when the female thread of the metal hose fitting is joined to the male thread of the metal reinforcing screw pipe, the female thread inlet closes to the tight fitting and the male screw end of the reinforcing screw pipe is inside the female thread of the metallic hose fastening. Since the screw is screwed into the O-ring packing installed in the device, a tight close coupling is required without additional packing. The connection is made without risk of leakage at the screwed portion.
In addition, a male thread is formed on the outer circumference of the hose insertion groove in the hose coupling part of the metal hose fastener, and the tightening nut is screwed together, and a tightening ring is interposed between the inner surface of the fastening nut and the outer surface of the hose. Therefore, the fastening nut is tightened as the screw is assembled, so that the hose fastener and the fastening nut can be tightly screwed together.
Therefore, when screwing metal hose fittings into the hose connector, the male threaded part of the metal reinforcement screw pipe and the female screw of the metal hose fastening screw are assembled to satisfy the robustness and airtightness. You can get it.
도 1은 본 발명의 요부 단면도
도 2는 도 1의 분해 단면도
도 3은 본 발명의 전체적인 구성을 보이는 일부 파절 분해 사시도이다.1 is a cross-sectional view of main parts of the present invention
2 is an exploded cross-sectional view of FIG.
3 is a partially exploded perspective view showing the overall configuration of the present invention.
본 발명은 열가소성 합성수지인 폴리프로필렌 랜덤 공중합체 또는 폴리부틸렌을 원료로 하여 파이프 형상으로 온수중계관체(1)를 성형하여 중심구멍 양단에 마개(1a)(1b)를 끼워 밀봉시키고 주벽을 따라 4~9개의 구멍(1c) 뚫어서 각 구멍에 중계관체와 같은 합성수지로 성형한 호스연결구(3)의 접속부를 용접하고 연결구 외면에 보강철판(10)을 끼워 고정너트(10a)로 고정시키고 각 호스연결구 중에서 하나를 선택하여 온수를 공급하는 온수주입호스(2)를 연결하고 나머지 연결구에 공급된 온수를 각 방으로 분배하는 온수분배용호스(9)를 접속시키는 보일러용 온수중계관에 있어서,
중계관체에 용접되는 호스연결구(3)의 중심공(3a)에 각각 금속관체(4)로 되어 외주면에 결착돌기(4a)가 형성되어 합성수지제 호스연결구(3)의 중심공(3a)에 매설되는 매설부를 형성하고 금속관체(4)의 선단부가 호스연결구의 입구 외측으로 돌출되도록 하여 돌출부(4b) 외주면에 수나사부(4c)를 형성하며 수나사부(4c)와 매설부 를 구획하는 경계부에 환상요입홈부(4d)를 형성하여 호스연결구의 중심부공에 매설하면 매설부와 요입홈이 호스연결구와 결합되고 수나사부가 외부로 돌출되게 한 금속제보강나사관(가)과.
금속제보강나사관(가)의 수나사부(4c)에 나사결합하는 암나사부(5a)를 구비하고 반대측에 호스연결구(5b)가 형성되어 외주에 호스접속홈(5c)이 구비되며 호스접속홈(5c) 외측에 수나사관(5d)이 형성되어 체결너트(6)와 나사조립되고 호스접속홈(5c)에 호스조임링(7)이 삽입되며 암나사부(5a)와 호스연결구(5b)가 이어지는 경계부 내측에 요입홈(5e)을 형성하여 패킹(5f)을 개입한 금속제호스체결구(5)로 이루어져 금속제호스체결구(5)의 암나사부(5a)가 금속제보강나사관(가)의 수나사부에 나사결합하도록 만든 구성이다.
According to the present invention, a hot
Each
A female threaded
1 : 온수중계관체 1a,1b : 마개
1c : 구멍 2 : 온수주입호스
3 : 호스연결구 3a : 중심공
4 : 금속관체 4a : 결착돌기
4b : 돌출부 4c : 수나사부
4d : 환상요입홈부 5 : 금속제호스체결구
5a : 암나사부 5b : 호스연결구
5c : 호스접속홈 5d : 수나사관
5e : 요입홈 5f : 패킹
6 : 체결너트 7 : 호스조임링
9 : 온수분배용호스 10 : 보강철판
10a : 고정너트 가 : 금속제보강나사관1: hot
1c: hole 2: hot water injection hose
3:
4:
4b:
4d: annular groove 5: metal hose fastener
5a:
5c:
5e:
6: tightening nut 7: hose tightening ring
9: hot water distribution hose 10: reinforcing steel plate
10a: Fixing nut A: Metal reinforcement screw tube
Claims (1)
중계관체에 용접되는 호스연결구(3)의 중심공(3a)에 각각 금속관체(4)로 되어 외주면에 결착돌기(4a)가 형성되어 합성수지제 호스연결구(3)의 중심공(3a)에 매설되는 매설부를 형성하고 금속관체(4)의 선단부가 호스연결구의 입구 외측으로 돌출되도록 하여 돌출부(4b) 외주면에 수나사부(4c)를 형성하며 수나사부(4c)와 매설부 를 구획하는 경계부에 환상요입홈부(4d)를 형성하여 호스연결구의 중심부공에 매설하면 매설부와 요입홈이 호스연결구와 결합되고 수나사부가 외부로 돌출되게 한 금속제보강나사관(가)과.
금속제보강나사관(가)의 수나사부(4c)에 나사결합하는 암나사부(5a)를 구비하고 반대측에 호스연결구(5b)가 형성되어 외주에 호스접속홈(5c)이 구비되며 호스접속홈(5c) 외측에 수나사관(5d)이 형성되어 체결너트(6)와 나사조립되고 호스접속홈(5c)에 호스조임링(7)이 삽입되며 암나사부(5a)와 호스연결구(5b)가 이어지는 경계부 내측에 요입홈(5e)을 형성하여 패킹(5f)을 개입한 금속제호스체결구(5)로 이루어져 금속제호스체결구(5)의 암나사부(5a)가 금속제보강나사관(가)의 수나사부에 나사결합하도록 만든 폴리프로필렌 랜덤 공중합체(ＰＰＲ)또는 폴리부틸렌(ＰＢ)을 원료로 하는 보일러용 온수중계관The hot water relay tube 1 is formed into a pipe shape using polypropylene random copolymer or polybutylene, which is a thermoplastic synthetic resin, and is sealed by inserting stoppers 1a and 1b at both ends of the center hole. We drilled the holes (1c) and welded the connections of the hose connectors (3) molded with synthetic resin such as relay pipes to each hole, and fixed with fixing nuts (10a) by inserting a reinforcing steel plate (10) on the outer surface of the connectors. In the hot water relay pipe for the boiler to connect the hot water injection hose (2) to selectively supply hot water and to connect the hot water distribution hose (9) for distributing the hot water supplied to the remaining connector to each room,
Each metal tube 4 is formed in the center hole 3a of the hose connector 3 welded to the relay pipe, and a binding protrusion 4a is formed on the outer circumferential surface, and is embedded in the center hole 3a of the hose connector 3 made of synthetic resin. The buried portion is formed and the tip of the metal tube 4 protrudes outward from the inlet of the hose connector so that the male threaded portion 4c is formed on the outer circumferential surface of the protruding portion 4b, and the annular portion divides the male threaded portion 4c and the buried portion. The metal reinforcing screw pipe (4) which forms the concave inlet groove (4d) and embeds it in the central hole of the hose connector so that the buried part and the concave groove are combined with the hose connector and the male screw part protrudes outward.
A female threaded portion 5a is screwed to the male threaded portion 4c of the metal reinforcement screw tube (A), and a hose connector 5b is formed on the opposite side, and a hose connection groove 5c is provided on the outer circumference thereof. 5c) A male screw pipe 5d is formed on the outer side and screw-assembled with the fastening nut 6, and a hose tightening ring 7 is inserted into the hose connecting groove 5c, and the female screw portion 5a and the hose connector 5b are connected. The female threaded portion 5a of the metal hose fastener 5 is formed by the metal hose fastener 5 formed through the packing 5f by forming the recessed groove 5e inside the boundary. Hot water relay pipes for boilers made from polypropylene random copolymers (PPR) or polybutylene (PＢ), which are screwed into the threaded portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020100019983A KR101188654B1 (en) | 2010-03-05 | 2010-03-05 | Boiler junction tube made from polypropylene random copolymer and polybutylene |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020100019983A KR101188654B1 (en) | 2010-03-05 | 2010-03-05 | Boiler junction tube made from polypropylene random copolymer and polybutylene |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR20110100901A KR20110100901A (en) | 2011-09-15 |
| KR101188654B1 true KR101188654B1 (en) | 2012-10-08 |
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ID=44953166
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020100019983A KR101188654B1 (en) | 2010-03-05 | 2010-03-05 | Boiler junction tube made from polypropylene random copolymer and polybutylene |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR101188654B1 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100788200B1 (en) | 2007-08-28 | 2007-12-26 | 주식회사 대율케이앤피 | Boiler junction tube made from polypropylene random copolymer and polybutylene |
| KR100805689B1 (en) | 2007-09-05 | 2008-02-21 | 주식회사 대율케이앤피 | Boiler junction tube made from polypropylene random copolymer and polybutylene |
| KR100883214B1 (en) | 2008-11-19 | 2009-02-11 | 주식회사 대율케이앤피 | Boiler junction tube made from polypropylene random copolymer and polybutylene |
| KR100955315B1 (en) | 2009-10-14 | 2010-04-29 | 주식회사 대율케이앤피 | Boiler junction tube made from polypropylene random copolymer and polybutylene |
-
2010
- 2010-03-05 KR KR1020100019983A patent/KR101188654B1/en not_active IP Right Cessation
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100788200B1 (en) | 2007-08-28 | 2007-12-26 | 주식회사 대율케이앤피 | Boiler junction tube made from polypropylene random copolymer and polybutylene |
| KR100805689B1 (en) | 2007-09-05 | 2008-02-21 | 주식회사 대율케이앤피 | Boiler junction tube made from polypropylene random copolymer and polybutylene |
| KR100883214B1 (en) | 2008-11-19 | 2009-02-11 | 주식회사 대율케이앤피 | Boiler junction tube made from polypropylene random copolymer and polybutylene |
| KR100955315B1 (en) | 2009-10-14 | 2010-04-29 | 주식회사 대율케이앤피 | Boiler junction tube made from polypropylene random copolymer and polybutylene |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20110100901A (en) | 2011-09-15 |
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