CN1095533C - Metal pipe with heat-insulating foamed plastic coating and its manufacture - Google Patents
Metal pipe with heat-insulating foamed plastic coating and its manufacture Download PDFInfo
- Publication number
- CN1095533C CN1095533C CN00115382A CN00115382A CN1095533C CN 1095533 C CN1095533 C CN 1095533C CN 00115382 A CN00115382 A CN 00115382A CN 00115382 A CN00115382 A CN 00115382A CN 1095533 C CN1095533 C CN 1095533C
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- Prior art keywords
- heat
- layer
- metal pipe
- foaming
- plastics
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 49
- 239000002184 metal Substances 0.000 title claims abstract description 49
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 239000006223 plastic coating Substances 0.000 title claims description 19
- 229920003023 plastic Polymers 0.000 claims abstract description 46
- 239000004033 plastic Substances 0.000 claims abstract description 46
- 239000010410 layer Substances 0.000 claims abstract description 33
- 239000011241 protective layer Substances 0.000 claims abstract description 24
- 150000001875 compounds Chemical class 0.000 claims abstract description 14
- 239000006260 foam Substances 0.000 claims abstract description 9
- 238000005187 foaming Methods 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 16
- -1 polyethylene Polymers 0.000 claims description 12
- 239000004800 polyvinyl chloride Substances 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 10
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 8
- 239000002131 composite material Substances 0.000 claims description 8
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 claims description 6
- 239000004698 Polyethylene Substances 0.000 claims description 6
- 239000004743 Polypropylene Substances 0.000 claims description 6
- 239000004793 Polystyrene Substances 0.000 claims description 6
- 238000001125 extrusion Methods 0.000 claims description 6
- 229920000573 polyethylene Polymers 0.000 claims description 6
- 229920001155 polypropylene Polymers 0.000 claims description 6
- 229920002223 polystyrene Polymers 0.000 claims description 6
- 229920002635 polyurethane Polymers 0.000 claims description 6
- 239000004814 polyurethane Substances 0.000 claims description 6
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 4
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 claims description 3
- 230000008676 import Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 claims description 3
- 238000004381 surface treatment Methods 0.000 claims description 2
- 238000009413 insulation Methods 0.000 abstract description 11
- 239000002984 plastic foam Substances 0.000 abstract description 3
- 230000002265 prevention Effects 0.000 abstract 2
- 238000010276 construction Methods 0.000 abstract 1
- 238000009434 installation Methods 0.000 abstract 1
- 239000011810 insulating material Substances 0.000 description 4
- 229920001169 thermoplastic Polymers 0.000 description 4
- 239000004416 thermosoftening plastic Substances 0.000 description 4
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000003063 flame retardant Substances 0.000 description 3
- 239000003381 stabilizer Substances 0.000 description 3
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 2
- ACOGMWBDRJJKNB-UHFFFAOYSA-N acetic acid;ethene Chemical group C=C.CC(O)=O ACOGMWBDRJJKNB-UHFFFAOYSA-N 0.000 description 2
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 description 2
- 235000013539 calcium stearate Nutrition 0.000 description 2
- 239000008116 calcium stearate Substances 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- JXTHNDFMNIQAHM-UHFFFAOYSA-N dichloroacetic acid Chemical compound OC(=O)C(Cl)Cl JXTHNDFMNIQAHM-UHFFFAOYSA-N 0.000 description 2
- 229960005215 dichloroacetic acid Drugs 0.000 description 2
- 229920001038 ethylene copolymer Polymers 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 230000002335 preservative effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Thermal Insulation (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The present invention relates to a heat insulating metal pipe coated with foamed plastics, which is composed of a metal pipe, a plastic foam body layer and a plastic protective layer from the inside to the outside. The present invention uses a plastic extruder to extrude plastics of the foam body layer and the protecting layer. The foam body layer and the protecting layer are compounded and molded with the metal pipe in one time by a compound mold. The heat insulating metal pipe coated with foamed plastics of the present invention has the advantages of heat thermal insulation, moisture prevention, fire prevention, stable production quality, long service life, etc. A construction progress can be enhanced for the installation of a heat insulating pipeline by the utilization of the pipe, and manual labor strength can be reduced.
Description
Technical field:
The present invention relates to metallic conduit, particularly a kind of manufacture method of metal pipe with heat-insulating foamed plastic coating.
Background technique:
The heat-insulation and heat-preservation of existing metallic conduit normally with thermal insulating material by manual wrapped or be set on the appearance of metal tube; and then be wrapped on the thermal insulating material with boundary belt (cloth); need to consume great amount of manpower and material resources, not only labor intensity is big, and operator safety also has problems.Usually cause waste of material because of manual operations is improper, heat insulation effect is also bad, causes the energy and loss economically.Also usually because thermal insulating material is selected for use improper or the appearance protective layer does not have protective action and causes economic loss.
European patent EP-726134A1 discloses a kind of manufacture method of multilayer thermoplastic tube, comprises the following steps:
1. make the first layer thermoplastic pipe of inner wall smooth, appearance that it is uneven and above-mentioned external pipe welding (the equal out-of-flatness of appearance in the external pipe);
2. keep the uneven shape of external pipe;
3. the external pipe with above-mentioned not planar surface is heated to fusion temp;
4. the external pipe to above-mentioned heating is forced into less than around atmospheric pressure;
5. on above-mentioned heating and the external pipe appearance injustice, extrude one deck thermoplastic pipe again;
6. to the pressurization of above-mentioned pipe, make the welding of the 3rd layer of pipe and second layer pipe, pressurization this moment and last time pressurizeed different;
7. cooling multiplayer pipe.
But this is a manufacture method of making the multilayer thermoplastic tube, does not disclose the manufacture method of metal pipe with heat-insulating foamed plastic coating.
Summary of the invention:
The technical problem to be solved in the present invention is to provide a kind of manufacture method of metal pipe with heat-insulating foamed plastic coating in order to overcome above-mentioned defective, creates conditions with the large-scale industrial production that realizes the metal tube heat-insulation and heat-preservation.
Technical solution of the present invention is as follows:
A kind of manufacture method of metal pipe with heat-insulating foamed plastic coating comprises the following steps:
Mud, dirt, greasy dirt are removed in the surface treatment of 1＞metal tube;
The preparation of 2＞plastics foam raw material, mixing in extruder, heat fused, foaming;
The preparation of 3＞plastic protective layer raw material, mixing, heat fused in extruder;
The preheating of 4＞metal tube;
5＞extruder is extruded the plastics foam of fusing and is compound with the surface extruding of metal tube;
6＞extruder is extruded the protective layer plastics of fusing, and compound with foaming body layer plastic co-extrusion;
7＞cooling and shaping.
Be characterized in that above-mentioned the 4th, the 5th, the 6th step is one-time formed in composite machine head.
Said composite machine head is by lock screw, interior adjusting screw with regulate screw outward and connect to form by preceding locknut, plug, mould parent, foaming machine neck, big mouthful mould, back locknut, sandwich layer rod, body, osculum mould, sheath machine neck and heater, between mould parent, foaming machine neck, sandwich layer rod and big mouthful mould, constitute foaming body runner S1, between body, sheath machine neck and big mouthful mould, constitute sheath runner S2.
Said metal tube is under the preheating of heater; the plastics foam of fusing and foaming imports foaming body runner S1 by extruder down by the extruding of foaming machine neck; compound in the extruding of the surface of die orifice and metal tube; the protective layer plastics of fusing import sheath runner S2 down by the extruding that extruder passes through sheath machine neck; compound at die orifice and foaming layer plastic co-extrusion, once-through has the metal pipe with heat-insulating foamed plastic coating of metal tube, plastics blister layer and plastic protective layer.
The body material of described plastics blister layer can be PVC, polystyrene, polyethylene, polyurethane, polypropylene, or acrylonitrile butadient styrene, or ethylene-vinyl acetate copolymer.
The body material of described plastic protective layer can be PVC, polystyrene, polyethylene, polyurethane, polypropylene, or acrylonitrile butadient styrene, or ethylene-vinyl acetate copolymer.
The invention will be further described below in conjunction with drawings and Examples.
Description of drawings:
Fig. 1 is the structural representation of metal pipe with heat-insulating foamed plastic coating of the present invention.
Fig. 2 is the structure cross-sectional schematic of composite dies of the present invention.
Among the figure: 1---metal tube
2---the plastics blister layer
3---plastic protective layer
01---preceding locknut 02---plug 03---mould parent
04---foaming machine neck 05---big mouthful mould 06---back locknut
07---sandwich layer rod 08---body 09---osculum mould
011---lock screw 012---is regulated screw 013 outward---sheath machine neck
014---interior adjusting screw 015---heater
Embodiment:
The structure of metal pipe with heat-insulating foamed plastic coating of the present invention as shown in Figure 1, internal layer is a metal tube 1, the centre is a plastic foam material layer 2, skin is a plastic protective layer 3.Said metal tube can be various metal tubes or metallic hose.The body material of said plastics blister layer can be a PVC, or polystyrene, or polyethylene, or polyurethane, or polypropylene, or acrylonitrile. butadiene. and styrol copolymer, or ethene. acetate ethylene copolymer etc.The body material of said plastic protective layer also can be chosen from following raw materials according: PVC, polystyrene, polyethylene, polyurethane, polypropylene, acrylonitrile. ethene. and styrol copolymer, ethene. acetate ethylene copolymer.Certainly when once choosing foaming body body material and protective layer body material, wish that their melting point is approaching, same material is better certainly.
The manufacture method of metal pipe with heat-insulating foamed plastic coating of the present invention comprises the following steps:
1. processing such as mud, dirt, greasy dirt are removed on metal tube 1 surface; 2. plastics foam raw material preparation, mixed in extruder, heat fused, foaming; 3. plastic protective layer raw material preparation, mixed in extrusion press, heat fused; 4. metal tube gives heat; 5. extruder will melt that the plastics foam that foamed is extruded and be compound with the surface extruding of metal tube; 6. extruder is extruded the protective layer plastics of fusing, and compound with the foaming layer plastic co-extrusion; Above-mentioned the 4. 7. cooling and shaping is characterized in, 5., 6. the step is one step completed in a composite machine head.
Fig. 2 is the structure cross-sectional schematic of composite machine head in the manufacture method of the present invention.This composite machine head is by preceding locknut 01; plug 02; mould parent 03; foaming machine neck 04; big mouthful mould 05; back locknut 06; sandwich layer rod 07; body 08; osculum mould 09; sheath machine neck 013 and heater 015 are by lock screw 011; outer adjusting screw 012 and interior adjusting screw 014 are formed by connecting; at mould parent 03; foaming machine neck 04; constitute foaming body runner S1 between sandwich layer rod 07 and the big mouthful mould 05; pass through the extruding current downflow of foaming machine neck 04 owing to extruder for the expandable plastic of fusing; at body 08; constitute sheath runner S2 between sheath machine neck 013 and the big mouthful mould 05; by the extruding current downflow of extruder, has metal tube 1 for the protective layer plastics that melt at die orifice and metal tube 1 compound once-through by sheath machine neck 013; the metal pipe with heat-insulating foamed plastic coating of plastic foam material layer 2 and plastic protective layer 3.
The feasibility and the technique effect of explanation the present invention and the manufacturing process thereof of taking a single example below.
Select PVC to make the body material of foaming body, its prescription is as follows:
The raw material weight ratio
PVC 100
Stabilizer 10.2
Tissuemat E 1.3
Ceresine 14
Calcium stearate 3.8
Filler 6.3
Stabilizer 0.8
Protective layer (selecting PVC to make the main body raw material)
PVC 100
Stabilizer 12.0
Tissuemat E 1.3
Ceresine 8.0
Calcium stearate 2.5
Plasticizing agent 18.0
Filler 6.0
Fire retardant 15.0
Antiager 3.3
Pigment 0.2
Utilizing above-mentioned raw materials is 150 ℃ to Cu metal tubes in the extruder barrel temperature, 140 ℃ of die sleeve temperature, 45 rev/mins of extruder screw rotating speeds, head pressure 12 MPas have obtained compound one-time formed metal pipe with heat-insulating foamed plastic coating under the process parameter of copper pipe hauling speed 5 meter per seconds.Show that with on probation the performance and the advantage of the metal pipe with heat-insulating foamed plastic coating that technology of the present invention is compound are after tested:
(1), thermal conductivity is low, when 0 ℃ of mean temperature, pipeline thermal conductivity≤0.03 watt/meter. degree (w/m.k) only is 1/10th of a traditional insulation pipe thermal conductivity; Under identical environmental conditions, the thermal insulating material use amount that reaches identical heat insulation effect descends more than 50%.
(2), the closed pore thermal insulation layer, steam is difficult to be penetrated among the material, not only has been incubated but also moistureproof the wet resistance factor 〉=5000;
(3), owing to added fire retardant, preservative etc., the plastic protective layer fire-retardant fireproof, oxygen index is up to more than 28; Anti-corrosion capacity is strong, protective layer tensile strength 〉=10 MPas, and the anti-intensity height that damages of resistance to compression, working life 〉=30 year are fit to building and wait the facility use.
(4), install simple and easyly, will improve project progress greatly, greatly reduce labor intensity.
The advantage of manufacturing process of the present invention:
(1) but the large-scale industrial production utilidor is applicable to the insulation of any metal tube Process, according to the pipe insulation requirement, capable of regulating technology changes insulation layer thickness, satisfying the market Requirement.
(2), manual pipe insulation mode, use machinery equipment production metal pipe with heat-insulating have been changed The road, technological parameter and consistency of performance are good, and quality is secure.
(3), manufacturing process is reasonable, structure of compound mould and molding mode uniqueness are utilized plastics Self hot melt hot pressing characteristic is carried out the once-combined moulding of trilaminate material, and product is stable.
Claims (5)
1, a kind of manufacture method of metal pipe with heat-insulating foamed plastic coating comprises the following steps:
Mud, dirt, greasy dirt are removed in 1＞metal tube (1) surface treatment;
The preparation of 2＞plastics blister layer raw material, mixing in extruder, heat fused, foaming;
The preparation of 3＞plastic protective layer raw material, mixing, heat fused in extruder;
4＞metal tube (1) preheating;
5＞extruder is extruded the plastics foam of fusing and is pushed a compound plastics blister layer (2) with the surface of metal tube;
6＞extruder is extruded the protective layer plastics of fusing, and is combined into one deck plastic protective layer (3) with foaming body layer plastic co-extrusion;
7＞cooling and shaping.
It is characterized in that: the step of the 4th, the 5th, the 6th in the above-mentioned technology is one step completed in a composite machine head.
2, the manufacture method of metal pipe with heat-insulating foamed plastic coating according to claim 1, it is characterized in that said composite dies is by preceding locknut (01), plug (02), mould parent (03), foaming machine neck (04), big mouthful mould (05), back locknut (06), sandwich layer rod (07), body (08), osculum mould (09), sheath machine neck (013) and heater (015) are by lock screw (011) and the outer screw (012) of regulating, interior adjusting screw (014) connects to form, in mould parent (03), foaming machine neck (04), constitute foaming body runner (S1) between sandwich layer rod (07) and big mouthful of mould (05), in body (08), constitute sheath runner (S2) between sheath machine neck (013) and big mouthful of mould (05).
3; the manufacture method of metal pipe with heat-insulating foamed plastic coating according to claim 1 and 2; it is characterized in that: said metal tube (1) is under the preheating of heater (015); the plastics foam of fusing and foaming imports foaming body runner (S1) by extruder down by foaming machine neck (04) extruding; compound in the extruding of the surface of die orifice and metal tube (1); the fusing the protective layer plastics by extruder by extruding through sheath runner (S2) under the extruding of sheath machine neck (013); compound at die orifice and foaming layer plastic co-extrusion, once-through has metal tube (1); the metal pipe with heat-insulating foamed plastic coating of plastics blister layer (2) and plastic protective layer (3).
4, the manufacture method of metal pipe with heat-insulating foamed plastic coating according to claim 3, it is characterized in that: the body material of described plastics blister layer (2) can be PVC, polystyrene, polyethylene, polyurethane, polypropylene, or acrylonitrile butadient styrene, or ethylene-vinyl acetate copolymer.
5, the manufacture method of metal pipe with heat-insulating foamed plastic coating according to claim 3; it is characterized in that: the body material of described plastic protective layer (3) can be PVC, polystyrene, polyethylene, polyurethane, polypropylene; or acrylonitrile butadient styrene, or ethylene-vinyl acetate copolymer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00115382A CN1095533C (en) | 2000-04-13 | 2000-04-13 | Metal pipe with heat-insulating foamed plastic coating and its manufacture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00115382A CN1095533C (en) | 2000-04-13 | 2000-04-13 | Metal pipe with heat-insulating foamed plastic coating and its manufacture |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1267801A CN1267801A (en) | 2000-09-27 |
| CN1095533C true CN1095533C (en) | 2002-12-04 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN00115382A Expired - Fee Related CN1095533C (en) | 2000-04-13 | 2000-04-13 | Metal pipe with heat-insulating foamed plastic coating and its manufacture |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1095533C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1303352C (en) * | 2003-03-21 | 2007-03-07 | 上海久通塑胶制品有限公司 | Metal pipe convered with foamed plastic for thermal insulation and its mfg. method |
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| CN101746034B (en) * | 2009-12-30 | 2013-04-10 | 王远孔 | Method for fabricating three-layer co-extruded composite section |
| CN102954293A (en) * | 2012-11-11 | 2013-03-06 | 大连日盛实业有限公司 | Small-size medium-high-temperature aluminum alloy and PVC (Polyvinyl Chloride) compound heat-insulating tube |
| CN103758439A (en) * | 2014-01-20 | 2014-04-30 | 郑建祥 | Steel-plastic co-extruded energy-saving profile full coated with hard PVC (polyvinyl chloride) |
| CN103883811A (en) * | 2014-04-11 | 2014-06-25 | 苏州市依星橡塑有限公司 | Cold-resistant plastic tube |
| CN105065792A (en) * | 2015-07-31 | 2015-11-18 | 大禹节水（天津）有限公司 | Cold-resistant high impact strength unplasticized polyvinyl chloride (PVC-U) composite pipe and preparation method thereof |
| CN105437490A (en) * | 2015-12-08 | 2016-03-30 | 朗格斯特哈尔滨环保节能产品制造有限公司 | Continuous production complete equipment of crosslinked polyethylene polyurethane thermal insulation pipe and production method |
| CN105383066A (en) * | 2015-12-08 | 2016-03-09 | 朗格斯特哈尔滨环保节能产品制造有限公司 | Continuous production device and method for straight pipe polyurethane thermal insulation pipes |
| CN106287112A (en) * | 2016-08-11 | 2017-01-04 | 珠海格力电器股份有限公司 | Heat insulation pipeline, processing method thereof and air conditioner |
| CN107314194A (en) * | 2017-06-07 | 2017-11-03 | 海宁亚丰塑业有限公司 | A kind of metal pipe with heat-insulating and its preparation technology |
| CN109130130B (en) * | 2018-11-05 | 2023-12-15 | 福建亚通新材料科技股份有限公司 | Composite pipe protective layer coating die |
| CN110171091A (en) * | 2019-03-26 | 2019-08-27 | 江苏欣荣普尔斯机械有限公司 | A kind of second time of foaming mold |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2040208U (en) * | 1987-09-02 | 1989-06-28 | 营口市示范消声器厂 | Insulating polyurethane tube with outer plastic casing |
| EP0726134A1 (en) * | 1995-02-13 | 1996-08-14 | Wilhelm Hegler | Method and apparatus for producing a thermoplastic multi layer pipe, especially from polyolefin |
| EP0768488A2 (en) * | 1995-10-10 | 1997-04-16 | Bundy Corporation | Metal tubing coated with multiple layers of polymeric materials |
| CN2341001Y (en) * | 1998-10-01 | 1999-09-29 | 于镇旗 | Steel plastic composite pipe |
-
2000
- 2000-04-13 CN CN00115382A patent/CN1095533C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2040208U (en) * | 1987-09-02 | 1989-06-28 | 营口市示范消声器厂 | Insulating polyurethane tube with outer plastic casing |
| EP0726134A1 (en) * | 1995-02-13 | 1996-08-14 | Wilhelm Hegler | Method and apparatus for producing a thermoplastic multi layer pipe, especially from polyolefin |
| EP0768488A2 (en) * | 1995-10-10 | 1997-04-16 | Bundy Corporation | Metal tubing coated with multiple layers of polymeric materials |
| CN2341001Y (en) * | 1998-10-01 | 1999-09-29 | 于镇旗 | Steel plastic composite pipe |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1303352C (en) * | 2003-03-21 | 2007-03-07 | 上海久通塑胶制品有限公司 | Metal pipe convered with foamed plastic for thermal insulation and its mfg. method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1267801A (en) | 2000-09-27 |
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Owner name: SHANGHAI BOYANG PLASTIC INDUSTRIAL CO., LTD. Free format text: FORMER OWNER: CHEN RENCI; ZHOU BAOMAO; SHEN LIANG; CHEN ZHENGLIANG Effective date: 20030214 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20030214 Patentee after: Shanghai Boym Plastics Industry Patentee before: Chen Renci Patentee before: Zhou Baomao Patentee before: Shen Liang Patentee before: Chen Zhengliang |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20021204 Termination date: 20100413 |