CN101086306B - Composite pipe and its producing method - Google Patents
Composite pipe and its producing method Download PDFInfo
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- CN101086306B CN101086306B CN2007100681258A CN200710068125A CN101086306B CN 101086306 B CN101086306 B CN 101086306B CN 2007100681258 A CN2007100681258 A CN 2007100681258A CN 200710068125 A CN200710068125 A CN 200710068125A CN 101086306 B CN101086306 B CN 101086306B
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Abstract
The invention involves a composite pipe and the manufacturing method. The composite pipe includes polypropylene pipe layer, the metal pipe layer, epoxy resin pipe layer and gel resin pipe layer from inner to outer sequentially on the radial direction. The manufacturing method of the composite pipe are: (1) shrinking-fit the formed food-grade polypropylene tubes and metal pipes in the way of molding pressing or drafting tightly; (2) cleaning the outer surface of the pipe, sticking two ports of pipe materials inner hole with plugs, spraying epoxide resin on the outer surface of metal pipe layer; (3) stewing the pipe materials sprayed with epoxide resin 6-24 hours in the condition of ventilating and temperature of 15deg.C-50deg.C, then preparing the pipe materials with epoxide resin layer; (4) spraying or spraying artificially a layer of gel resin on the outer surface of the epoxide resin layer under the condition of 20deg.C-60deg.C, after the gel resin is solidified and formed, the composite pipe products are prepared. The advantages of the composite pipe are: better appearance and better erosion resistance, aging-proof and corrosion resistance performance.
Description
Technical field
The present invention relates to a kind of pipe fitting, be specifically related to a kind of composite pipe and manufacture method thereof that is used to carry drinkable liquid.
Background technique
Be used in the family at present that tap water is carried and be used for mainly containing three kinds of Stainless Steel Tube pipe, galvanized pipe pipe and polypropylene tube pipes such as the pipe fitting that drinkable liquids such as milk, fruit juice are carried at factory floor.
The Stainless Steel Tube pipe is installed easy to connect, detachable and comparison health, and using effect is better, but its cost of material is higher; The galvanized pipe pipe also have install easy to connect, detachable and hygienic advantages relatively, but ageing-resistant and corrosion resistance is relatively poor; Low, ageing-resistant, the good corrosion resistance of polypropylene pipe tube material cost can satisfy the sanitation and hygiene requirement that drinkable liquid is carried, and connect inconvenience but install, and intensity is lower, easily damage.
Chinese patent CN2437424Y discloses a kind of double-deck composite pipe, and its structural feature is made up of interior pipe and outward appearance, and interior pipe is a polypropylene plastics, and outer tube is seamless aluminum alloy.The shortcoming of this kind composite pipe is that mechanical strength is still lower, and it still is not very convenient that connection is installed.
Above-mentioned in addition 4 kinds of pipe parts are in long-term use, and the pipe fitting outer wall can be because of dust and the corrosion filthy dirty that becomes, and is difficult to clean.
Summary of the invention
First purpose of the present invention provides the pipe fitting that better and corrosion-resistant, the ageing-resistant and rust stable of a kind of outward appearance is used to carry drinkable liquid.
Second purpose of the present invention provides a kind of method of making composite pipe.
Realize the technological scheme of first purpose of the present invention: a kind of composite pipe is comprising polypropylene tube layer, metal tube layer, epoxy resin pipe layer and gel coating resin pipe layer in the radial direction from the inside to the outside successively.
Above-mentioned metal tube layer is cast iron tube layer, Stainless Steel Tube layer or Al-alloy pipe layer, and above-mentioned gel coating resin pipe layer preferably adopts color adhesive coating resin pipe layer.
The diameter of bore of above-mentioned composite pipe is 6mm～1000mm, and the thickness of polypropylene tube layer is 0.5mm～10mm, and the thickness of metal tube layer is 0.5mm～20mm, and the thickness of epoxy resin pipe layer is 0.2mm～3mm, and the thickness of gel coating resin pipe layer is 0.2mm～100mm.
The metal tube layer of end, above-mentioned composite pipe two ends also all has a projecting ring section, wherein epoxy resin pipe layer and gel coating resin pipe layer are from postponing between the projecting ring section at composite pipe two ends and covering on the outer surface of two projecting ring sections of this metal tube layer, promptly at this projecting ring section place, composite pipe is comprising polypropylene tube layer, metal tube layer, epoxy resin pipe layer and gel coating resin pipe layer in the radial direction from the inside to the outside successively.
Above-mentioned metal tube layer is at the thickness at two the projecting ring section places big 1mm～10mm of thickness than the metal tube layer between the ring portion place two projectioies.
The metal tube layer of above-mentioned composite pipe one end end also has one to the outer lug and the metal tool joint pin of exposing, the outer surface of metal tool joint pin has screw thread, promptly in this metal tool joint pin place, composite pipe is comprising polypropylene tube layer and metal tube layer in the radial direction from the inside to the outside successively; The other end end at this composite pipe, the metal tube layer also has a metal female joint, metal female joint internal surface has screw thread, epoxy resin pipe layer and gel coating resin pipe layer are from postponing between metal female joint and the metal tool joint pin and covering on this metal female joint outer surface, promptly in this metal female joint place, composite pipe is comprising metal tube layer, epoxy resin pipe layer and gel coating resin pipe layer in the radial direction from the inside to the outside successively; Two composite pipes match and can link together by described metal female joint and metal tool joint pin.
Realize that the present invention's second purpose technological scheme of the present invention is: the manufacture method of above-mentioned composite pipe has following steps:
1. earlier the food-grade polypropylene pipe that is shaped and metal tube closely are linked in together with the method for mold pressing or stretching and form tubing with polypropylene tube layer and metal tube layer;
2. 1. cleaning handles the outer surface of the tubing that obtains through step, clogs two ports of polypropylene tube endoporus with stopper, with the outer surface spray epoxy of spray gun at the metal tube layer;
3. under ambient temperature was 15 ℃～50 ℃ ventilation condition, the tubing that is coated with epoxy resin that 2. step is made left standstill 6 hours to 24 hours, obtained having the tubing of epoxy resin layer;
4. under ambient temperature is 20 ℃～60 ℃ condition, spray again or hand is stuck with paste one deck gel coating resin at the outer surface of epoxy resin layer, after gel coating resin solidify to form gel coating resin pipe layer, can obtain the finished product composite pipe.
Described metal tube layer is cast iron tube layer, Stainless Steel Tube layer or Al-alloy pipe layer, and gel coating resin pipe layer is a color adhesive coating resin pipe layer.
The diameter of bore of described composite pipe is 6mm～1000mm, and the thickness of polypropylene tube layer is 0.5mm～10mm, and the thickness of metal tube layer is 0.5mm～20mm, and the thickness of epoxy resin pipe layer is 0.2mm～3mm, and the thickness of gel coating resin pipe layer is 0.2mm～10mm.
The metal tube layer of end, composite pipe two ends also all has a projecting ring section, wherein epoxy resin pipe layer and gel coating resin pipe layer are from postponing between the projecting ring section at composite pipe two ends and covering on the outer surface of two projecting ring sections of this metal tube layer, promptly at this projecting ring section place, composite pipe is comprising polypropylene tube layer, metal tube layer, epoxy resin pipe layer and gel coating resin pipe layer in the radial direction from the inside to the outside successively.
Described metal tube layer is at the thickness at two the projecting ring section places big 1mm～100mm of thickness than the metal tube layer between the ring portion place two projectioies.
The metal tube layer of described composite pipe one end end also has one to the outer lug and the metal tool joint pin of exposing, the outer surface of metal tool joint pin has screw thread, promptly in this metal tool joint pin place, composite pipe is comprising polypropylene tube layer and metal tube layer in the radial direction from the inside to the outside successively; The other end end at this composite pipe, the metal tube layer also has a metal female joint, metal female joint internal surface has screw thread, epoxy resin pipe layer and gel coating resin pipe layer are from postponing between metal female joint and the metal tool joint pin and covering on this metal female joint outer surface, promptly in this metal female joint place, composite pipe is comprising metal tube layer, epoxy resin pipe layer and gel coating resin pipe layer in the radial direction from the inside to the outside successively; Two composite pipes match and can link together by described metal female joint and metal tool joint pin.
The present invention has positive effect: the interior pipe that (1) the present invention and drinkable liquid closely contact is owing to adopt polypropylene nontoxic and that chemical stability is good, so satisfied the requirement of sanitation and hygiene.(2) the present invention is owing to adopt cast iron tube layer, Stainless Steel Tube layer, Al-alloy pipe layer as the overall mechanical strength of metal tube layer with the enhancing composite pipe, so applicable surface is wider; Especially when adopting cast iron to make this composite pipe, also has lower-cost advantage as the metal tube layer.(3) the present invention is owing to adopt epoxy resin pipe layer as the transition layer between gel coating resin pipe layer and the metal tube layer, because epoxy resin and metal and nonmetally all have a cohesive force preferably, so the gel coating resin layer among the present invention is firm especially, is suitable for long-term use.(4) the present invention is owing to adopt the top layer of gel coating resin as composite pipe, it is stable and reliable for performance, durable in use, because gel coating resin pipe layer and polypropylene tube layer tightly are wrapped in the inside with metal layer, so whole composite pipe has corrosion-resistant, ageing-resistant and rust stable advantage; When adopting the color adhesive coating resin, its outward appearance is especially beautiful, in addition because the bright and clean characteristic of gel coating resin pipe layer, even make the present invention after long-term the use, during long-pending slow dust, also only need clean, and appearance again can light as new.(5) in the method for manufacturing composite pipe of the present invention, the method that has adopted under suitable ambient temperature on epoxy resin layer spraying or hand to stick with paste is coated gel coating resin, under this temperature, can strengthen the firm degree of gel coating resin layer and epoxy resin layer, make the composite pipe that makes have long working life.
Description of drawings
Fig. 1 is a structural representation stereogram of the present invention.
Fig. 2 is another kind of structural representation of the present invention.
Fig. 3 is the third structural representation of the present invention.
Be labeled as shown in the accompanying drawing: polypropylene tube layer 1, metal tube layer 2, projecting ring section 21, epoxy resin pipe layer 3, gel coating resin pipe layer 4, metal tool joint pin 22, screw thread 22-1, metal female joint 23, screw thread 23-1.
Embodiment
(embodiment 1)
See Fig. 1, the composite pipe of present embodiment is comprising polypropylene tube layer 1, cast iron tube layer 2, epoxy resin pipe layer 3 and yellow gel coating resin pipe layer 4 in the radial direction from the inside to the outside successively.The diameter of bore of this composite pipe is 10mm,, the thickness of polypropylene tube layer 1 is 0.5mm, and the thickness of metal tube layer 2 is 1mm, and the thickness of epoxy resin pipe layer 3 is 0.2mm, and the thickness of gel coating resin pipe layer 4 is 0.5mm.
The manufacture method of this kind composite pipe has following steps: 1. earlier the food-grade polypropylene pipe that is shaped and cast iron tube closely are linked in together with the method that stretches and form and have the polypropylene tube layer 1 of the composite pipe size that meets present embodiment and the tubing of cast iron tube layer 2;
2. 1. cleaning handles the outer surface of the tubing that obtains through step, clogs two ports of polypropylene tube endoporus with stopper, with the outer surface spray epoxy of spray gun at cast iron tube 2;
3. left standstill 12 hours under ambient temperature is 25 ℃～30 ℃ ventilation condition, the tubing that is coated with epoxy resin that 2. step is made left standstill 6 hours, obtained having the tubing of epoxy resin layer 3;
4. then under ambient temperature is 20 ℃～30 ℃ condition, spray the gel coating resin of one deck yellow again at the outer surface of epoxy resin layer, after gel coating resin solidify to form gel coating resin pipe layer 4, can obtain the finished product composite pipe.
Composite pipe in the present embodiment, from seeing the yellow that is light, impunctate, pinprick on the surface of gel coating resin pipe layer 4, better and corrosion-resistant, the ageing-resistant and corrosion resistant of outward appearance in appearance, because thinner, can be used in the family life as aqueduct or as the water pipeline of fountain.
(embodiment 2)
See Fig. 2, the composite pipe in the present embodiment is at the gel coating resin pipe layer 4 that comprises polypropylene tube layer 1, Al-alloy pipe layer 2, epoxy resin pipe layer 3 and substantially transparent in the radial direction from the inside to the outside successively.
The Al-alloy pipe layer 2 of this end, composite pipe two ends also all has a projecting ring section 21, wherein epoxy resin pipe layer 3 and gel coating resin pipe layer 4 are from postponing between the projecting ring section 21 at composite pipe two ends and covering on the outer surface of two projecting ring sections 21 of this Al-alloy pipe layer, promptly at these projecting ring section 21 places, composite pipe is comprising polypropylene tube layer 1, Al-alloy pipe layer 2, epoxy resin pipe layer 3 and gel coating resin pipe layer 4 in the radial direction from the inside to the outside successively.
The diameter of bore of this composite pipe is 50mm,, the thickness of polypropylene tube layer 1 is 2mm, and the thickness of Al-alloy pipe layer 2 is 1mm, and the thickness of epoxy resin pipe layer 3 is 1mm, and the thickness of gel coating resin pipe layer 4 is 1.5mm.Al-alloy pipe layer 2 is at the thickness at two the projecting ring section 21 places big 10mm of thickness than the Al-alloy pipe layer 2 between the ring portion place two projectioies.
The preparation method of the composite pipe of present embodiment has following steps: 1. earlier the food-grade polypropylene pipe that is shaped and the Al-alloy pipe that meets the basic property of present embodiment shape closely are linked in together with the method for mold pressing and form and have the polypropylene tube layer 1 of the composite pipe size that meets present embodiment and the tubing of Al-alloy pipe layer 2;
2. 1. cleaning handles the outer surface of the tubing that obtains through step, clogs two ports of polypropylene tube endoporus with stopper, with the outer surface spray epoxy of spray gun at Al-alloy pipe layer 2;
3. left standstill 24 hours under ambient temperature is 15 ℃～20 ℃ ventilation condition, the tubing that is coated with epoxy resin that 2. step is made left standstill 6 hours, obtained having the tubing of epoxy resin layer 3;
4. then under ambient temperature is 45 ℃～60 ℃ condition, the outer surface of epoxy resin layer again hand stick with paste the gel coating resin of one deck white, after gel coating resin solidify to form gel coating resin pipe layer 4, can obtain the finished product composite pipe.
Composite pipe in the present embodiment, be white in color impunctate, pinprick on the surface of gel coating resin pipe layer 4, better and corrosion-resistant, the ageing-resistant and corrosion resistant of outward appearance from seeing substantially in appearance, because thicker, can be used in the building as drainage pipe and be used for factory carrying drinkable liquid.
(embodiment 3)
See Fig. 3, the composite pipe in the present embodiment is at the gel coating resin pipe layer 4 that comprises polypropylene tube layer 1, Stainless Steel Tube layer 2, epoxy resin pipe layer 3 and substantially transparent in the radial direction from the inside to the outside successively.
The Stainless Steel Tube layer 2 of this composite pipe one end end also has one to the outer lug and the stainless steel tool joint pin 22 of exposing, the outer surface of stainless steel tool joint pin 22 has screw thread 22-1, promptly at these stainless steel tool joint pin 22 places, composite pipe is comprising polypropylene tube layer 1 and Stainless Steel Tube layer 2 in the radial direction from the inside to the outside successively; The other end end at this composite pipe, the Stainless Steel Tube layer also has a stainless steel female joint 23, stainless steel female joint 23 internal surfaces have screw thread 23-1, epoxy resin pipe layer 3 and gel coating resin pipe layer 4 are from postponing between stainless steel female joint 23 and the stainless steel tool joint pin 22 and covering on these stainless steel female joint 23 outer surfaces, promptly at these stainless steel female joint 23 places, composite pipe is comprising Stainless Steel Tube layer 2, epoxy resin pipe layer 3 and gel coating resin pipe layer 4 in the radial direction from the inside to the outside successively; Two composite pipes match and can link together easily by described stainless steel female joint 23 and stainless steel tool joint pin 22.
The diameter of bore of this composite pipe is 200mm,, the thickness of polypropylene tube layer 1 is 4mm, and the thickness of Stainless Steel Tube layer 2 is 5mm, and the thickness of epoxy resin pipe layer 3 is 2mm, and the thickness of gel coating resin pipe layer 4 is 2mm.
The manufacture method of present embodiment has following steps: 1. earlier the food-grade polypropylene pipe that is shaped and the Stainless Steel Tube that meets the basic property of present embodiment shape closely are linked in together with the method for mold pressing and form and have the polypropylene tube layer 1 of the composite pipe size that meets present embodiment and the tubing of Stainless Steel Tube layer 2;
2. 1. cleaning handles the outer surface of the tubing that obtains through step, clogs two ports of polypropylene tube endoporus with stopper, with the outer surface spray epoxy of spray gun at Stainless Steel Tube layer 2;
3. left standstill 6 hours under ambient temperature is 40 ℃～50 ℃ ventilation condition, the tubing that is coated with epoxy resin that 2. step is made left standstill 6 hours, obtained having the tubing of epoxy resin layer 3;
4. then under ambient temperature is 25 ℃～35 ℃ condition, spray the gel coating resin of one deck white again at the outer surface of epoxy resin layer, after gel coating resin solidify to form gel coating resin pipe layer 4, can obtain the finished product composite pipe.
Composite pipe in the present embodiment is white in color from seeing substantially in appearance, impunctate, pinprick on the surface of gel coating resin pipe layer 4, and better and corrosion-resistant, the ageing-resistant and corrosion resistant of outward appearance, since thicker, can be used for laying in the water factory large-scale water transmission pipeline.
Obviously, the above embodiment of the present invention only is for example of the present invention clearly is described, and is not to be qualification to embodiments of the present invention.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here need not also can't give exhaustive to all mode of executions.And these belong to conspicuous variation or the change that spirit of the present invention extended out and still are among protection scope of the present invention.
Claims (2)
1. composite pipe, it is characterized in that: this composite pipe is comprising polypropylene tube layer (1), metal tube layer (2), epoxy resin pipe layer (3) and gel coating resin pipe layer (4) in the radial direction from the inside to the outside successively; Described metal tube layer (2) is the cast iron tube layer; Gel coating resin pipe layer (4) is a color adhesive coating resin pipe layer; The metal tube layer (2) of end, described composite pipe two ends also all has a projecting ring section (21), wherein epoxy resin pipe layer (3) and gel coating resin pipe layer (4) are from postponing between the projecting ring section (21) at composite pipe two ends and covering on the outer surface of two projecting ring sections (21) of this metal tube layer, promptly locate at this projecting ring section (21), composite pipe is comprising polypropylene tube layer (1), metal tube layer (2), epoxy resin pipe layer (3) and gel coating resin pipe layer (4) in the radial direction from the inside to the outside successively; The diameter of bore of described composite pipe is 6mm～1000mm, the thickness of polypropylene tube layer (1) is 0.5mm～10mm, the thickness of metal tube layer (2) is 0.5mm～20mm, and the thickness of epoxy resin pipe layer (3) is 0.2mm～3mm, and the thickness of gel coating resin pipe layer (4) is 0.2mm～10mm; The thickness that described metal tube layer (2) is located at two projecting ring sections (21) is than the big 1mm～100mm of thickness of the metal tube layer (2) between the ring portion place two projectioies; The metal tube layer (2) of described composite pipe one end end also has one to the outer lug and the metal tool joint pin (22) of exposing, the outer surface of metal tool joint pin (22) has screw thread (22-1), promptly locate in this metal tool joint pin (22), composite pipe is comprising polypropylene tube layer (1) and metal tube layer (2) in the radial direction from the inside to the outside successively; The other end end at this composite pipe, the metal tube layer also has a metal female joint (23), metal female joint (23) internal surface has screw thread (23-1), epoxy resin pipe layer (3) and gel coating resin pipe layer (4) are from postponing between metal female joint (23) and the metal tool joint pin (22) and covering on this metal female joint (23) outer surface, promptly locate in this metal female joint (23), composite pipe is comprising metal tube layer (2), epoxy resin pipe layer (3) and gel coating resin pipe layer (4) in the radial direction from the inside to the outside successively; Two composite pipes match and can link together by described metal female joint (23) and metal tool joint pin (22).
2. the manufacture method of the described composite pipe of claim 1 has following steps:
1. earlier the food-grade polypropylene pipe that is shaped and metal tube closely are linked in together with the method for mold pressing or stretching and form tubing with polypropylene tube layer (1) and metal tube layer (2); Described metal tube layer (2) is the cast iron tube layer; Gel coating resin pipe layer (4) is a color adhesive coating resin pipe layer; Also all there is a projecting ring section (21) end at metal tube layer (2) two ends;
2. 1. cleaning handles the outer surface of the tubing that obtains through step, clogs two ports of polypropylene tube endoporus with stopper, with the outer surface spray epoxy of spray gun at metal tube layer (2);
3. under ambient temperature was 15 ℃～50 ℃ ventilation condition, the tubing that is coated with epoxy resin that 2. step is made left standstill 6 hours to 24 hours, obtain the having epoxy resin layer tubing of (3);
4. under ambient temperature is 20 ℃～60 ℃ condition, spray again or hand is stuck with paste one deck gel coating resin at the outer surface of epoxy resin layer (3); Wherein epoxy resin pipe layer (3) and gel coating resin pipe layer (4) are from postponing between the projecting ring section (21) at composite pipe two ends and covering on the outer surface of two projecting ring sections (21) of this metal tube layer, promptly locate at this projecting ring section (21), composite pipe is comprising polypropylene tube layer (1), metal tube layer (2), epoxy resin pipe layer (3) and gel coating resin pipe layer (4) in the radial direction from the inside to the outside successively; After gel coating resin solidify to form gel coating resin pipe layer (4), can obtain the finished product composite pipe; The diameter of bore of described composite pipe is 6mm～1000mm, the thickness of polypropylene tube layer (1) is 0.5mm～10mm, the thickness of metal tube layer (2) is 0.5mm～20mm, and the thickness of epoxy resin pipe layer (3) is 0.2mm～3mm, and the thickness of gel coating resin pipe layer (4) is 0.2mm～10mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100681258A CN101086306B (en) | 2007-04-14 | 2007-04-14 | Composite pipe and its producing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100681258A CN101086306B (en) | 2007-04-14 | 2007-04-14 | Composite pipe and its producing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101086306A CN101086306A (en) | 2007-12-12 |
| CN101086306B true CN101086306B (en) | 2010-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007100681258A Expired - Fee Related CN101086306B (en) | 2007-04-14 | 2007-04-14 | Composite pipe and its producing method |
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| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103538227A (en) * | 2013-10-18 | 2014-01-29 | 权基善 | Composite pipe with metal pipe coated by resin, and manufacturing method and construction method thereof |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102789836B (en) * | 2011-05-20 | 2014-04-23 | 泰科电子(上海)有限公司 | Insulated conduit bus and manufacturing method thereof |
| CN103644387A (en) * | 2013-11-28 | 2014-03-19 | 无锡合众信息科技有限公司 | Acid and alkali-resistant multilayer pipe |
| WO2019173853A2 (en) * | 2018-03-07 | 2019-09-12 | Andersen Mike Kirk | Modular flotation device with mechanism to removably attach to other modular devices |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2223407Y (en) * | 1995-04-18 | 1996-03-27 | 古传洪 | Insert type flexible-rigid socket jointing short sleeve |
| US5868437A (en) * | 1995-07-17 | 1999-02-09 | Teague; Anthony | Composite pipe structure |
| CN2472041Y (en) * | 2000-11-21 | 2002-01-16 | 曹兆棠 | Pipe joint |
-
2007
- 2007-04-14 CN CN2007100681258A patent/CN101086306B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2223407Y (en) * | 1995-04-18 | 1996-03-27 | 古传洪 | Insert type flexible-rigid socket jointing short sleeve |
| US5868437A (en) * | 1995-07-17 | 1999-02-09 | Teague; Anthony | Composite pipe structure |
| CN2472041Y (en) * | 2000-11-21 | 2002-01-16 | 曹兆棠 | Pipe joint |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103538227A (en) * | 2013-10-18 | 2014-01-29 | 权基善 | Composite pipe with metal pipe coated by resin, and manufacturing method and construction method thereof |
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| CN101086306A (en) | 2007-12-12 |
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