CN1651219A - Method of manufacturing reinforced composite plastic pipe material and its device - Google Patents
Method of manufacturing reinforced composite plastic pipe material and its device Download PDFInfo
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- CN1651219A CN1651219A CN 200510020432 CN200510020432A CN1651219A CN 1651219 A CN1651219 A CN 1651219A CN 200510020432 CN200510020432 CN 200510020432 CN 200510020432 A CN200510020432 A CN 200510020432A CN 1651219 A CN1651219 A CN 1651219A
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- steel wire
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- thin layer
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Abstract
A method for preparing the reinforced composite plastic pipe includes such steps as extruding out central polymer pipe, winding steel wire or steel band spirally, coating the adhesive or the mixture of adhesive and polymer, extruding out external composite polymer pipe, cooling and cutting to needed length.
Description
Technical field:
The present invention is relevant with the method for making plastic pipe, strengthens the method for composite plastic pipe and installs relevant with manufacturing especially.
Background technology:
In plastic pipe, increase to twine wire or spiral winding steel in recent years strengthening the existing report of tubing intensity and to use, disclose as CN2313137Y that a kind of usefulness is metal knitted to reticulate, be combined into multiple tube with interior pipe and outer tube.CN2202838Y discloses the multiple tube that accompanies the layer of metal mesh grid between a kind of tube wall layer and the outer wall layer equally, but, the personnel of this field professional technique know, the surface of metallic framework such as steel and aluminium is a polar surfaces, and stronger polymer such as the polyethylene of antiseptic power, the interface of polyolefine materials such as polypropylene is an apolar surfaces, at polymer fusion clad metal skeleton, behind cooling and shaping, the interface of metallic framework and polymer non-individual body in fact only is that a kind of machinery coats, the interface do not have real affinity promptly bonding form one, should not become real composite construction composite in other words, therefore also influenced the wider application of this pipeline, even there is corrosive medium to go into metallic framework by the metallic framework of the pipe end of cut-out and the contacting permeation of polymer, the corroding metal skeleton, and then wear out the plastic outer layer on the metallic framework and danger that pipeline was lost efficacy.In order to address this problem; CN2142168Y discloses a kind of at the multiple tube that scribbles adhesive layer at least between one deck winding steel wire layer and plastic core pipe and the outer layer plastic; but increase extruder and die head; and binding agent need have thickness; measure very big; very uneconomical; and CN2466468Y discloses a kind of multiple tube that is wound in compound outer back formation on the core pipe at coating one layer binder and protective layer on the steel wire again; but only solved the compound firm problem of steel wire and ectonexine; and do not combine closely between the ectonexine polymer pipe; patent 02223171 at the core tube-surface that twines steel wire with compound die head compound binding agent layer; but can or be equipped with the material price costliness that bonds with the metal material surface affinity; adopt extrusion mechanism to apply a layer binder thickness need be arranged; measure very big; very uneconomical, and the equipment complexity, to increase by one at least and extrude and compound die head.Therefore applied for 200410081432 in person.6 patents, the Steel Wire Surface spraying adhesive powder bed that after winding of core tube-surface spiral or braided steel wire, utilizes adhesive powder electrostatic dusting or fluid bed dusting device that spiral is twined or weaves, but the Electrostatic Absorption between adhesive powder and core tube-surface and the steel wire is limited in one's ability, easily causes powder to come off and ejecta pollution environment everywhere.
Summary of the invention:
The objective of the invention is can effectively address the above problem in order to provide a kind of, the manufacturing that helps improving pipe workpiece quality and production efficiency and improve production environment strengthens the method for composite plastic pipe.
Another object of the present invention is for a kind of device that strengthens composite plastic pipe of making is provided.
The object of the present invention is achieved like this:
The present invention makes the method for strong composite plastic pipe, comprise the blend layer of extruded polymer or organosilane crosslinked polyethylene core pipe or extruded polymer or organosilane crosslinked polyethylene core pipe while at core tube-surface coextrusion one deck adhesive layer or binding agent and polymer, the cross-helicity winding of the core tube-surface left and right sides or braided steel wire or spiral winding steel at cooling and shaping, the core tube-surface of cooling and shaping and/or after the cross-helicity winding of the core tube-surface left and right sides or braided steel wire or spiral winding steel its surface coverage with the blend of binding agent or binding agent and polymer form can be with the adhered plastics thin layer of polymeric outer layer and core pipe and the tight compoiste adhering of steel wire, extrude the composition polymer outer tube, and through the cooling sizing, the traction cutting produces the enhancing composite plastic pipe, if not at core tube-surface coextrusion one deck adhesive layer, can cover the adhered plastics thin layer at the core tube-surface, the tight compoiste adhering of core tube-surface and steel wire is in the same place, on spiral winding or braided steel wire or spiral winding steel tubular steel skeleton, cover the adhered plastics thin layer simultaneously, make the tight compoiste adhering of steel wire or steel band and polymeric outer layer together, if at core tube-surface coextrusion one deck adhesive layer, can only on spiral winding or braided steel wire or spiral winding steel tubular steel skeleton, cover the adhered plastics thin layer.By on spiral winding or braided steel wire or spiral winding steel tubular steel skeleton, covering the adhered plastics thin layer, binding agent is evenly distributed, fine and closely woven, can be securely attached to steel wire or steel strip surface, when steel wire or steel band and core pipe together enter skin and extrude in the compound die head, the binding agent plastic film layers can be stable with polymeric outer layer and steel wire or steel band secure bond together, the metallic framework that has solved the metallic skeleton reinforced composite plastic pipe is an adhesion problem with the interface affinity of outer and core tube-surface strata compound non-individual body, tubing is used under various environmental conditions and can not cause metallic framework and the delamination of ectonexine plastics.
Above-mentioned manufacturing strengthens the method for composite plastic pipe, adopt the spiral canoe that the adhered plastics thin layer is covered core tube-surface and/or the surface after the cross-helicity winding of the core tube-surface left and right sides or braided steel wire or spiral winding steel, after heater is to its heat treated, extrude the composition polymer outer tube again, and produce the enhancing composite plastic pipe through cooling sizing, traction cutting.Adopt the spiral canoe to cover the adhered plastics thin layer, processing ease is reliable, can be with the adhered plastics thin layer core tube-surface of all standing after left and right sides cross-helicity winding or braided steel wire or spiral winding steel closely, heater can adopt heaters such as high frequency, infrared-ray oven.
Above-mentioned manufacturing strengthens the method for composite plastic pipe, employing along tubing axial surface coverage mode at core tube-surface and/or the surface coverage adhered plastics thin layer after the cross-helicity winding of the core tube-surface left and right sides or braided steel wire or spiral winding steel, after heater is to its heat treated, extrude the composition polymer outer tube again, and produce the enhancing composite plastic pipe through cooling sizing, traction cutting.Employing can be cancelled around the wrapping machine structure of core pipe rotation along tubing axial surface coverage mode, and equipment is simple, and it is easy that the volume film uses up follow-up blooming.
Above-mentioned manufacturing strengthens the method for composite plastic pipe, after core tube-surface and/or the surface coverage adhered plastics thin layer after the cross-helicity winding of the core tube-surface left and right sides or braided steel wire or spiral winding steel, utilize pinch roller that the adhered plastics thin layer closely is coated on core tube-surface and/or the surface after the cross-helicity winding of the core tube-surface left and right sides or braided steel wire or spiral winding steel entirely.Also can heat, make pinch roller more reliably the adhered plastics thin layer closely is coated on full core tube-surface and/or the surface after the cross-helicity winding of the core tube-surface left and right sides or braided steel wire or spiral winding steel pinch roller.
Above-mentioned manufacturing strengthens the method for composite plastic pipe, described adhered plastics thin layer is an aperture that the useful needle-penetration of cloth hole forms, be beneficial to discharge air when coating film and extruding the composition polymer outer tube, utilize the acupuncture roller when preparation adhered plastics film, just on film, to sting full trickle aperture, so that the air that will remain in film and steel wire or the steel band when coating film and extruding the composition polymer outer tube is discharged, ectonexine polymer tube wall more closely seamlessly is in the same place with steel wire or the tight compoiste adhering of steel band.
The method that above-mentioned manufacturing strengthens composite plastic pipe is the air that utilizes in the withdrawing device discharge adhered plastics thin layer.
Above-mentioned manufacturing strengthens the method for composite plastic pipe, and the adhered plastics thin layer that the blend of binding agent or binding agent and polymer is formed is ethene-maleic anhydride graft copolymer or propylene-maleic anhydride graft copolymer or ethylene-acrylic acid copolymer or ethene-(methyl) acrylic copolymer.Binding agent can adopt ethene and maleic anhydride or acrylic ester grafted copolymer, or is grafted with other copolymer of polar bond on ethene or propylene, and polymeric material is high density polyethylene (HDPE) or crosslinked polyethylene or polypropylene.
Above-mentioned manufacturing strengthens the method for composite plastic pipe, and the adhered plastics thin layer has the polyethylene or the polypropylene layer of co-extrusion outward, can save the binding agent consumption, and makes the low binding agent of viscosity make things convenient for film forming, improves adhered plastics thin layer intensity.
The present invention makes the device that strengthens composite plastic pipe, comprise the polymer core pipe extrusion mechanism that is arranged in order, core pipe cooling sizing mechanism, steel wire spiral winding machine or braider or spiral winding steel machine, polymeric outer layer pipe extrusion mechanism, composite plastic pipe cooling sizing mechanism, haulage gear, cutting mechanism is after core pipe cooling sizing mechanism and/or be mounted with film-covering mechanism at core tube-surface and/or the surface coverage adhered plastics thin layer after the cross-helicity winding of the core tube-surface left and right sides or braided steel wire or spiral winding steel after steel wire spiral winding machine or braider or spiral winding steel mechanism.The adhered plastics thin layer of rolling is placed in the complex membrane mechanism, and the rete of therefrom emitting covers the core tube-surface after core pipe or left and right sides cross-helicity winding or braided steel wire or the spiral winding steel.
Above-mentioned manufacturing strengthens the device of composite plastic pipe, the film-covering mechanism of adhered plastics thin layer is the spiral wound form, comprise around the wrapping machine structure of core pipe rotation, drive the transmission mechanism that the wrapping machine structure centers on core pipe motor rotating and is subjected to driven by motor, place the storage film device in the wrapping machine structure.
Above-mentioned manufacturing strengthens the device of composite plastic pipe, the film-covering mechanism of adhered plastics thin layer is along tubing axial surface coverage mode, comprise film placing mechanism, film is coated on the pressing wheel mechanism on core tube-surface and/or the surface after the cross-helicity winding of the core tube-surface left and right sides or braided steel wire or spiral winding steel.
Above-mentioned manufacturing strengthens the device of composite plastic pipe, pair polymer core pipe and/or spiral wound steel wire or steel band are arranged before or after the film-covering mechanism of adhered plastics thin layer and/or cover spiral wound steel wire after the adhered plastics thin layer or heater that steel band carries out heat treated, to making the binding agent rete can be after steel wire or the steel band heat treated more securely attached to Steel Wire Surface, owing to also make steel wire rein in adhesive layer into the coextrusion of core tube-surface to the heat effect of core tube-surface and steel wire, steel wire and core tube-surface strata compound are combined closely more, particularly adopt high-frequency heating to handle, only make steel wire itself heating, make steel wire can rein in into the adhesive layer of core tube-surface coextrusion and the core pipe owing to be heated and can not produce moderate finite deformation.
Above-mentioned manufacturing strengthens the device of composite plastic pipe, is mounted with air extractor at film-covering mechanism and/or polymeric outer layer pipe extrusion mechanism place, and air extractor can be provided with separately, also can be attached to the outer tube extrusion die.
The present invention can production knockout pipe surface and winding or weave steel wire on it or spiral twines the enhancing composite plastic pipe closely compound between steel band on it and outer composite plastic, that quality is high, having solved the metallic framework of metallic skeleton reinforced composite plastic pipe and the interface affinity of polymer non-individual body is adhesion problem.The core tube-surface of cooling sizing and/or the cross-helicity winding of the core tube-surface left and right sides or braided steel wire or spiral winding steel after its surface coverage with the blend of binding agent or binding agent and polymer composition can be with polymeric outer layer and core pipe and steel wire or the tight compoiste adhering of steel band adhered plastics thin layer together, make the polymer non-individual body by binding agent with skeleton compound be steel-plastics composite pipe.This multiple tube is promptly saved binder material bearing capacity height again, and anti-corrosion capability is strong, and cost is low, and the scope of application is wide.
Description of drawings:
Fig. 1 is a production method horizontal layout schematic diagram of the present invention.
Fig. 2 twines covering adhered plastics film laminate means figure at its surperficial spiral after the cross-helicity winding steel wire of the left and right sides.
Fig. 3 covers adhered plastics film laminate means figure along the tubing axial surface.
Fig. 4 covers another installation drawing of adhered plastics thin layer along the tubing axial surface.
The spiral wound steel wire reinforced composite plastic pipe schematic diagram that Fig. 5 produces for the inventive method
Fig. 6 is another horizontal layout schematic diagram of production method of the present invention.
The specific embodiment:
Embodiment 1:
Fig. 1～Fig. 5 has provided present embodiment 1 figure.
Referring to Fig. 1, be disposed with sandwich layer pipe extruder 1 among the present invention, sandwich layer pipe coextrusion die head 2, extruder 3 at sandwich layer tube-surface coextrusion one layer binder, before the sandwich layer pipe, final vacuum sizing case 4, sandwich layer pipe spraying cooling water case 5, sandwich layer pipe hauling machine 6,2 steel wire coilers 7 (or steel wire braider) that are respectively left and right sides cross-helicity winding steel wire on the sandwich layer pipe, at Steel Wire Surface film covering device 8, heater 9, outer tube extruder and die head 10, composite pipe vacuum sizing case 11, composite pipe spraying cooling water case 12, multiple tube hauling machine 13, cutting machine 14, heap pipe support 15.Compared with the prior art the present invention has increased after steel wire coiler or braider 7 exactly in Steel Wire Surface covering adhered plastics film laminate means 8, promptly before extruding compound outer layer copolymer 27, adopt covering adhered plastics film laminate means 8 on steel skeleton 22, to cover adhered plastics thin layer 16, make ectonexine polymer tube wall 25 and 27 by adhesive layer 26 and adhered plastics thin layer 16 that skeleton 22 is compound for the steel-plastics composite pipe 28 of hole skeleton is arranged, having solved the metallic framework of metallic skeleton reinforced composite plastic pipe and the interface affinity of polymer non-individual body is adhesion problem.
The embodiment of the invention 1 is made the method that strengthens composite plastic pipe, being included in polyethylene or organosilane crosslinked polyethylene core pipe extrusion mechanism core tube-surface that extrude and that cool off sizing left and right sides cross-helicity twines or braided steel wire, adopted in the past and cover the adhered plastics film laminate means and on steel skeleton, cover the adhered plastics thin layer that has said minuscule hole extruding compound outer layer copolymer, utilize heater that steel wire and plastic film layers and core tube-surface are carried out heat treated, extrude the composition polymer outer tube again, and through the cooling sizing, the traction cutting produces spiral and twines or braided steel wire enhanced composite plastic pipe material.
Fig. 2 twines covering adhered plastics film laminate means 19 structure charts at its surperficial spiral in the production method in the present embodiment after the cross-helicity winding steel wire of the left and right sides.Spiral twines has the wrapping machine of driving structure to be centered around core pipe 17 surfaces upward left and right sides cross-helicity winding steel wire skeleton 22 motor rotating 21 and chain drive 20 in the film covering device 19, place the storage film device in the wrapping machine structure, be placed in the adhered plastics film volume 16 on the wrapping machine structure, during these device 19 work, motor 21 and chain drive 20 drive the core pipe rotation of wrapping machine structure around the band steel-wire carcass, along with the core pipe moves forward, adhered plastics film winding form in the shape of a spiral covers on the steel-wire carcass surface, after the film volume uses up, can utilize the storage film device---the film of laying on the storage film case 18 is rolled up and is carried out the work of spiral winding overlay film in the continued access continuously.
Also can be as Fig. 3 or the axial film-covering mechanism 23 of utilization shown in Figure 4, employing is along tubing axial surface coverage mode at least one adhered plastics thin layer 16 of surface coverage after 17 surperficial left and right sides cross-helicities windings of sandwich layer pipe or braided steel wire 29, be covered with tiny exhaust hole 24 on the adhered plastics thin layer 16, after heater is to its heat treated, extrude the composition polymer outer tube again, and produce spiral and twine or braided steel wire enhanced composite plastic pipe material through cooling sizing, traction cutting.Employing can be cancelled around the wrapping machine structure of core pipe rotation along tubing axial surface coverage mode, and equipment is simple, and it is easy that the volume film uses up follow-up blooming, can utilize in the film volume continued access of laying on the storage film device 18 and carry out overlay film work continuously.
The spiral that Fig. 5 produces for the inventive method twines or braided steel wire enhanced composite plastic pipe material 28 schematic diagrames.25 is the sandwich layer pipe among the figure, and 27 is polymeric outer layer, and 29 is left and right sides cross-helicity winding steel wire, and 26 is core tube-surface coextrusion one deck adhesive layer, and 16 is the adhered plastics thin layer.
Embodiment 2:
Fig. 6 has provided the embodiment of the invention 2 figure.Present embodiment 2 is basic same with embodiment 1, do not exist together be cancelled sandwich layer pipe coextrusion die head at sandwich layer pipe extruder 1 place, at the extruder of sandwich layer tube-surface coextrusion one layer binder, increase the film covering device 8 that covers the adhered plastics thin layer at the core tube-surface of cooling and shaping, increased the air extractor 30 of sandwich layer pipe extrusion die 33, outsourcing.Change the steel wire coiler (or steel wire braider) of left and right sides cross-helicity winding steel wire into spiral winding steel machine 31.
The various embodiments described above are that foregoing of the present invention is further described, but this should be interpreted as that the scope of the above-mentioned theme of the present invention only limits to the foregoing description.All technology that realizes based on foregoing all belong to scope of the present invention.
Claims (13)
1, make the method that strengthens composite plastic pipe, comprise the blend layer of extruded polymer or organosilane crosslinked polyethylene core pipe or extruded polymer or organosilane crosslinked polyethylene core pipe while at core tube-surface coextrusion one deck adhesive layer or binding agent and polymer, the cross-helicity winding of the core tube-surface left and right sides or braided steel wire or spiral winding steel at cooling and shaping, extrude the composition polymer outer tube, and through the cooling sizing, traction cutting produces spiral and twines or braided steel wire enhanced composite plastic pipe material, it is characterized in that the core tube-surface of cooling and shaping and/or the cross-helicity winding of the core tube-surface left and right sides or braided steel wire or spiral winding steel after its surface coverage with the blend composition of binding agent or binding agent and polymer can be with the adhered plastics thin layer of polymeric outer layer and core pipe and the tight compoiste adhering of steel wire.
2, manufacturing as claimed in claim 1 strengthens the method for composite plastic pipe, it is characterized in that adopting the spiral canoe that the adhered plastics thin layer is covered core tube-surface and/or the surface after the cross-helicity winding of the core tube-surface left and right sides or braided steel wire or spiral winding steel, after heater is to its heat treated, extrude the composition polymer outer tube again, and produce spiral and twine or braided steel wire enhanced composite plastic pipe material through cooling sizing, traction cutting.
3, manufacturing as claimed in claim 1 strengthens the method for composite plastic pipe, it is characterized in that adopting along tubing axial surface coverage mode at core tube-surface and/or the surface coverage adhered plastics thin layer after the cross-helicity winding of the core tube-surface left and right sides or braided steel wire or spiral winding steel, after heater is to its heat treated, extrude the composition polymer outer tube again, and produce spiral and twine or braided steel wire enhanced composite plastic pipe material through cooling sizing, traction cutting.
4, strengthen the method for composite plastic pipes as claim 1 or 2 or 3 described manufacturings, it is characterized in that after core tube-surface and/or the surface coverage adhered plastics thin layer after the cross-helicity winding of the core tube-surface left and right sides or braided steel wire or spiral winding steel, utilize pinch roller that the adhered plastics thin layer closely is coated on core tube-surface and/or the surface after winding of core tube-surface left and right sides cross-helicity or braided steel wire entirely.
5,, it is characterized in that described adhered plastics thin layer is an aperture that the useful needle-penetration of cloth hole forms, be beneficial to discharge air when coating film and composition polymer outer tube as the method for claim 1 or 2 or 3 described manufacturings enhancing composite plastic pipes.
6,, it is characterized in that utilizing the air in the air extractor discharge adhered plastics thin layer as the method for claim 1 or 2 or 3 described manufacturings enhancing composite plastic pipes.
7,, it is characterized in that the adhered plastics thin layer of the blend composition of binding agent or binding agent and polymer is ethene-maleic anhydride graft copolymer or propylene-maleic anhydride graft copolymer or ethylene-acrylic acid copolymer or ethene-(methyl) acrylic copolymer as the method for claim 1 or 2 or 3 described manufacturings enhancing composite plastic pipes.
8, as the method for claim 1 or 2 or 3 described manufacturings enhancing composite plastic pipes, it is characterized in that described adhered plastics thin layer has the polyethylene or the polypropylene layer of coextrusion outward.
9, make the device that strengthens composite plastic pipe, comprise the polymer core pipe extrusion mechanism that is arranged in order, core pipe cooling sizing mechanism, steel wire spiral winding machine or braider or taping machine, polymeric outer layer pipe extrusion mechanism, composite plastic pipe cooling sizing mechanism, haulage gear, cutting mechanism is characterized in that after core pipe cooling sizing mechanism and/or be provided with film-covering mechanism at core tube-surface and/or the surface coverage adhered plastics thin layer after winding of core tube-surface left and right sides cross-helicity or braided steel wire after steel wire spiral winding machine or braider or spiral winding steel.
10, manufacturing as claimed in claim 9 strengthens the device of composite plastic pipe, the film-covering mechanism that it is characterized in that the adhered plastics thin layer is the spiral wound form, comprise around the wrapping machine structure of core pipe rotation, drive the transmission mechanism that the wrapping machine structure centers on core pipe motor rotating and is subjected to driven by motor, place the storage film device in the wrapping machine structure.
11, manufacturing as claimed in claim 9 strengthens the device of composite plastic pipe, the film-covering mechanism that it is characterized in that the adhered plastics thin layer is along tubing axial surface coverage mode, comprise film placing mechanism, film is coated on the pressing wheel mechanism on core tube-surface and/or the surface after winding of core tube-surface left and right sides cross-helicity or braided steel wire.
12, manufacturing as claimed in claim 9 strengthens the device of composite plastic pipe, it is characterized in that pair polymer core pipe and/or spiral wound steel wire or steel band are arranged and/or cover spiral wound steel wire after the adhered plastics thin layer or heater that steel band carries out heat treated the film-covering mechanism of adhered plastics thin layer before or after.
13, manufacturing as claimed in claim 9 strengthens the device of composite plastic pipe, it is characterized in that being mounted with air extractor at film-covering mechanism and/or polymeric outer layer pipe extrusion mechanism place.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510020432XA CN100478154C (en) | 2005-03-02 | 2005-03-02 | Method of manufacturing reinforced composite plastic pipe material and its device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510020432XA CN100478154C (en) | 2005-03-02 | 2005-03-02 | Method of manufacturing reinforced composite plastic pipe material and its device |
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| Publication Number | Publication Date |
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| CN1651219A true CN1651219A (en) | 2005-08-10 |
| CN100478154C CN100478154C (en) | 2009-04-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB200510020432XA Expired - Fee Related CN100478154C (en) | 2005-03-02 | 2005-03-02 | Method of manufacturing reinforced composite plastic pipe material and its device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104747811A (en) * | 2014-03-24 | 2015-07-01 | 浙江天井塑业有限公司 | HDPE helical corrugated pipe and manufacturing method |
| CN112122968A (en) * | 2020-09-25 | 2020-12-25 | 姜平乐 | Thermal insulation pipe machining equipment |
| CN113771377A (en) * | 2021-09-03 | 2021-12-10 | 余世金 | Steel skeleton polyolefin pipeline, production device and production method |
-
2005
- 2005-03-02 CN CNB200510020432XA patent/CN100478154C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104747811A (en) * | 2014-03-24 | 2015-07-01 | 浙江天井塑业有限公司 | HDPE helical corrugated pipe and manufacturing method |
| CN112122968A (en) * | 2020-09-25 | 2020-12-25 | 姜平乐 | Thermal insulation pipe machining equipment |
| CN113771377A (en) * | 2021-09-03 | 2021-12-10 | 余世金 | Steel skeleton polyolefin pipeline, production device and production method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100478154C (en) | 2009-04-15 |
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Granted publication date: 20090415 Termination date: 20130302 |