CN105387289B - A kind of modified winding structure composite pipe and its preparation process - Google Patents
A kind of modified winding structure composite pipe and its preparation process Download PDFInfo
- Publication number
- CN105387289B CN105387289B CN201510812332.4A CN201510812332A CN105387289B CN 105387289 B CN105387289 B CN 105387289B CN 201510812332 A CN201510812332 A CN 201510812332A CN 105387289 B CN105387289 B CN 105387289B
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- reinforcing strip
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- 238000004804 winding Methods 0.000 title claims abstract description 185
- 239000002131 composite material Substances 0.000 title claims abstract description 25
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 42
- 238000005096 rolling process Methods 0.000 claims description 10
- 230000002787 reinforcement Effects 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 239000004033 plastic Substances 0.000 abstract description 4
- 229920003023 plastic Polymers 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 6
- -1 polypropylene Polymers 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 2
- 229920001903 high density polyethylene Polymers 0.000 description 2
- 239000004700 high-density polyethylene Substances 0.000 description 2
- 230000002262 irrigation Effects 0.000 description 2
- 238000003973 irrigation Methods 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001192 hot extrusion Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- 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
- F16L9/00—Rigid pipes
- F16L9/16—Rigid pipes wound from sheets or strips, with or without reinforcement
-
- 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
- F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
- F16L57/02—Protection of pipes or objects of similar shape against external or internal damage or wear against cracking or buckling
Abstract
The present invention relates to plastic pipe technical fields, and in particular to a kind of modified winding structure composite pipe and its preparation process.The composite pipe includes interior pressure-bearing pipe, the winding wall pipe being wrapped in interior pressure-bearing pipe outer wall, the winding pipe outside winding wall pipe, reinforcing strip, the reinforced pipe between winding pipe and outermost clad between winding pipe, the winding wall pipe is wrapped in interior pressure-bearing pipe outer wall by winding band and is formed, the section of winding pipe is closed semi-circular structure, and winding inner tube is equipped in winding pipe.The preparation process is slidably connected in different fixing axles respectively by wall device, winding pipe follow-up device, reinforcing strip follow-up device and reinforced pipe follow-up device is wound, and fixing axle is parallel with the center bearing bracket of interior pressure-bearing pipe institute fixing support rack, above-mentioned all devices carry out simultaneously.Composite pipe ring stiffness prepared by the present invention is larger, bearing capacity is strong, and the radius of winding structure composite pipe is expanded on the basis of rigidity improves.
Description
Technical field
The present invention relates to plastic pipe technical fields, and in particular to a kind of modified winding structure composite pipe and its system
Standby technique.
Background technique
Structure-wall pipe material belongs to chemical building material field, be with mould Dai Gang, with mould for cement regeneration product, be widely used in
Municipal drainage, remote low-pressure water delivery, mine and chemical industry draining, irrigation and water conservancy irrigation and the production of ventilation shaft and pressure vessels for the chemical industry
Deng, to save the energy, reduce pollution, protection environment it is significant.Winding structure wall pipe currently on the market is mainly complete
Plastotype winding structure wall pipe, full-plastic winding structure wall pipe have preferable low temperature resistant brittleness and high welding performance,
Toughness is preferable, and boundary of works area is extensive, and applicable ability is strong, and service life can also reach 50 years.But due to existing full-plastic knot
Structure wall tube material generally includes tube wall and the reinforcing rib along outer surface of tube wall helical arrangement, and tube wall is single to use high density polyethylene (HDPE)
Or polypropylene material hot extrusion is Wrapping formed, reinforcing rib includes polypropylene backbone pipe and the height that is coated on outside polypropylene backbone pipe
Density polyethylene.On the one hand, the tubing of this structure, to guarantee the equidistant winding of outer layer reinforcing rib, the diameter of inner tube is not
It is preferably excessive, otherwise not only can because pipe surface be formed by ripple it is too deep due to influence the winding position of outer layer reinforcing rib, lead to product
Appearance is irregular, and directly affects the intensity of tubing.On the other hand, the tubing of this structure, material of main part are poly- for high density
Ethylene and polypropylene, level is single, is limited by elasticity modulus of materials, with its ring stiffness of the increase of structure-wall pipe material caliber
It can reduce rapidly, the diameter of tubing is caused to should not be too large, limit the application of product.
Still further aspect, current structure-wall pipe material are all tube wall main body and end integrated molding, increase in this way for
As a result the tubing of production high-strength big-diameter leads to the materials of tubing presently mainly by increasing materials to improve intensity
Greatly, the weight weight of product, product it is at high cost.
Summary of the invention
It is an object of the present invention to provide a kind of modified winding structure composite pipe and its preparation processes, to solve
The problem of ring stiffness of current structure-wall pipe material is not high, bearing capacity is poor and thus limits the caliber range of tubing.
In order to achieve the above object of the invention, the invention adopts the following technical scheme:
A kind of modified winding structure composite pipe, including interior pressure-bearing pipe, the winding being wrapped in interior pressure-bearing pipe outer wall
Wall pipe, the winding pipe outside winding wall pipe, reinforcing strip, the reinforced pipe between winding pipe and outermost packet between winding pipe
Coating, the winding wall pipe are wrapped in interior pressure-bearing pipe outer wall by winding band and are formed, and the section of winding pipe is closed semicircle knot
Structure, winding pipe is interior to be equipped with winding inner tube.
Preferably, it is equipped in the internal layer of the winding band and reinforces skeleton；The reinforcement skeleton is by more reinforced wires
It is intertwined to form netted.
Preferably, the winding inner tube is structure as a whole with winding pipe, and is equipped with inside winding pipe and reinforces skeleton,
Reinforce skeleton be set on the circular arc of winding inner tube and winding inner tube on, the reinforcement skeleton is interweaved shape by more reinforced wires
It reticulates.
A kind of preparation process of modified winding structure composite pipe, specifically includes the following steps:
The preparation of A tubing main body:
(1) interior pressure-bearing pipe is squeezed out using extruder first, and interior pressure-bearing pipe is fixed on support frame；Support frame as described above packet
Centre frame is included, several telescopic rods on centre frame, and arc surface corresponding with telescopic rod, the arc surface form a cylinder
Shape, described telescopic rod one end are fixed with centre frame, and the other end drives circular arc to do stretching motion in axis direction；Then support frame will
Interior pressure-bearing pipe is supported；
(2) it is then spirally wound on the outer wall of pressure-bearing pipe using winding wall device by band is wound, and forms winding wall pipe,
The winding wall device includes winding band follow-up device and rolling depressor, and winding band follow-up device draws winding band, and rolling depressor is placed in winding
After band follow-up device roll bonding will be carried out between winding band and winding band；
(3) simultaneously spiral winding is spaced in winding wall pipe outer wall using winding pipe follow-up device；
(4) one layer of reinforcing strip is wound using reinforcing strip follow-up device between the winding pipe of interval spiral surrounding, it is described to add
The width of strong band is greater than the interval between winding pipe, and between winding pipe, the both sides of reinforcing strip are pressed together at the middle part of reinforcing strip
On winding pipe, then reinforcing strip and winding wall pipe and winding pipe are pressed using reinforcing strip cover；
(5) reinforced pipe follow-up device spiral surrounding is used in the reinforcing strip between the winding pipe for being located at interval spiral surrounding
Reinforced pipe；
(6) it is wrapped around layer in outermost layer；And use pressing device by clad and the above-mentioned tubing wall pressure being formed by
It closes；
The preparation of B end socket:
(7) end socket is prepared using winding process, the end socket includes having the bellmouth end socket of bellmouth and having inserting for socket
Then mouth end socket carries out thermo-fuse to bellmouth end socket and inlays；Thermo-fuse is wavy copper wire；
The combination of C tubing main body and end socket:
(8) both ends of the tubing main body of above-mentioned preparation are carried out to welding or hot binding with two kinds of end sockets respectively, by envelope
The connection of head, is prepared a kind of modified winding structure composite pipe.
Preferably, support frame as described above rotates around centre frame, and makees radial move along the direction of centre frame
It is dynamic；It is opposite with the winding pipe follow-up winding direction of device to wind wall device.
Preferably, the winding wall device, winding pipe follow-up device, reinforcing strip follow-up device and reinforced pipe follow-up
Device carries out simultaneously.
Preferably, the winding wall device, winding pipe follow-up device, reinforcing strip follow-up device and reinforced pipe follow-up
Device is slidably connected to respectively in different fixing axles, and fixing axle is parallel with center bearing bracket.
Preferably, the follow-up device in the winding wall device is wound band is wound, winding band and winding band
Between overlapping widths be 0.5-2cm；The rolling depressor is pressure roll, and the pressure that the pressure roll applies is 0.2-0.5Mpa.
Preferably, reinforcing strip cover bottom interval is set there are two idler wheel, and idler wheel spacing and winding pipe are between
Every matching, two idler wheel middle upper parts are equipped with a spill wheel, and the spill wheel and winding pipe match.Idler wheel and spill wheel are combined into
Just become an individually wheel after one.
The invention has the benefit that
1 ring stiffness is larger；
2 bearing capacities are strong；
3 production streamlineds, operation quickly, improve speed of production；
4 expand the radius of winding structure composite pipe on the basis of rigidity improves.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of modified winding structure composite pipe of the invention；
Fig. 2 is the apparatus structure schematic diagram of preparation process of the present invention；
Fig. 3 is a kind of structural schematic diagram of support frame of the present invention；
Fig. 4 is a kind of structural schematic diagram of reinforcing strip cover of the present invention bottom；
Fig. 5 is a kind of structural schematic diagram of present invention winding band；
Fig. 6 is a kind of structural schematic diagram of winding pipe of the present invention.
In figure: pressure-bearing pipe in 1,2 winding wall pipes, 3 winding pipe, 4 reinforcing strips, 5 reinforced pipes, 6 clads, 7 winding inner tubes, 8
Band is wound, 9 reinforce skeleton, 10 reinforced wires, 101 support frames, 102 centre frames, 103 telescopic rods, 104 arc surfaces, 201 winding walls
It sets, 202 winding band follow-up devices, 203 rolling depressors, 301 winding pipe follow-up devices, 401 reinforcing strip follow-up devices, 402 reinforcements are with pressure
Clutch, 403 idler wheels, 404 spill wheels, 501 reinforced pipe follow-up devices, 601 pressing devices, 701 fixing axles.
Specific embodiment
Below by specific embodiment the technical scheme of the present invention will be further described explanation.
Embodiment:
A kind of modified winding structure composite pipe as shown in Fig. 1, Fig. 5 and Fig. 6, including interior pressure-bearing pipe 1, is wrapped in
Winding wall pipe 2 on interior 1 outer wall of pressure-bearing pipe, the reinforcing strip 4 between winding pipe 3, is located at winding at the winding pipe 3 outside winding wall pipe 2
Reinforced pipe 5 and outermost clad 6 between pipe 3, the winding wall pipe 2 are wrapped in interior pressure-bearing pipe outer wall by winding band 8
It forms, the section of winding pipe 3 is closed semi-circular structure, and winding inner tube 7 is equipped in winding pipe 3.In the internal layer of the winding band
Equipped with reinforcement skeleton；The reinforcement skeleton 9 is intertwined to form netted by more reinforced wires 10.The winding inner tube 7 and winding
Pipe 3 is structure as a whole, and is equipped with inside winding pipe 3 and reinforces skeleton 9, reinforces skeleton 9 and is set on the circular arc of winding inner tube 7 and twines
In inner tube 7, the reinforcement skeleton 9 is intertwined to form netted by more reinforced wires 10.
The preparation process of the modified winding structure composite pipe, specifically includes the following steps: (in conjunction with Fig. 2, Fig. 3 Fig. 4
It is shown)
The preparation of A tubing main body:
(1) interior pressure-bearing pipe is squeezed out using extruder first, and interior pressure-bearing pipe is fixed on support frame；Support frame as described above packet
Centre frame is included, several telescopic rods on centre frame, and arc surface corresponding with telescopic rod, the arc surface form a cylinder
Shape, described telescopic rod one end are fixed with centre frame, and the other end drives circular arc to do stretching motion in axis direction；Then support frame will
Interior pressure-bearing pipe is supported；Support frame as described above rotates around centre frame, and moves radially along the direction of centre frame；It twines
It is opposite with the winding pipe follow-up winding direction of device around wall device；
(2) it is then spirally wound on the outer wall of pressure-bearing pipe using winding wall device by band is wound, and forms winding wall pipe,
The winding wall device includes winding band follow-up device and rolling depressor, and winding band follow-up device draws winding band, and rolling depressor is placed in winding
After band follow-up device roll bonding will be carried out between winding band and winding band；Follow-up device in the winding wall device brings winding into
Row winding, the overlapping widths between winding band and winding band are 0.5-2cm；The rolling depressor is pressure roll, and the pressure roll is applied
The pressure added is 0.2-0.5Mpa；
(3) simultaneously spiral winding is spaced in winding wall pipe outer wall using winding pipe follow-up device；
(4) one layer of reinforcing strip is wound using reinforcing strip follow-up device between the winding pipe of interval spiral surrounding, it is described to add
The width of strong band is greater than the interval between winding pipe, and between winding pipe, the both sides of reinforcing strip are pressed together at the middle part of reinforcing strip
On winding pipe, then reinforcing strip and winding wall pipe and winding pipe are pressed using reinforcing strip cover；Reinforcing strip cover bottom
Two idler wheels, idler wheel spacing and winding pipe is equipped at intervals with to match around interval, two idler wheel middle upper parts are equipped with a spill wheel,
The spill wheel and winding pipe match；
(5) reinforced pipe follow-up device spiral surrounding is used in the reinforcing strip between the winding pipe for being located at interval spiral surrounding
Reinforced pipe；
(6) it is wrapped around layer in outermost layer；And use pressing device by clad and the above-mentioned tubing wall pressure being formed by
It closes；
The preparation of B end socket:
(7) end socket is prepared using winding process, the end socket includes having the bellmouth end socket of bellmouth and having inserting for socket
Then mouth end socket carries out thermo-fuse to bellmouth end socket and inlays；Thermo-fuse is wavy copper wire；
End using separation preparation, is finally mutually tied the main body of tubing and end socket by the present invention with main body using thermo-fuse
It closes.
The combination of C tubing main body and end socket:
(8) both ends of the tubing main body of above-mentioned preparation are carried out to welding or hot binding with two kinds of end sockets respectively, by envelope
The connection of head, is prepared a kind of modified winding structure composite pipe.
Winding wall device, winding pipe follow-up device, reinforcing strip follow-up device and reinforced pipe follow-up device are slidably connected respectively
In in different fixing axles, and fixing axle is parallel with center bearing bracket, and above-mentioned all devices carry out simultaneously.
Claims (8)
1. a kind of modified winding structure composite pipe, which is characterized in that including interior pressure-bearing pipe (1), be wrapped in interior pressure-bearing pipe
(1) the winding wall pipe (2) on outer wall, winding wall pipe (2) outer winding pipe (3), the reinforcing strip (4) between winding pipe (3), be located at
Reinforced pipe (5) and outermost clad (6) between winding pipe (3), the winding wall pipe (2) are wrapped in by winding band (8)
It is formed in interior pressure-bearing pipe outer wall, the section of winding pipe (3) is closed semi-circular structure, and winding inner tube is equipped in winding pipe (3)
(7)；
Its preparation process specifically includes the following steps:
The preparation of A tubing main body:
(1) interior pressure-bearing pipe is squeezed out using extruder first, and interior pressure-bearing pipe is fixed on support frame；During support frame as described above includes
Heart frame, several telescopic rods on centre frame, and arc surface corresponding with telescopic rod, the arc surface form a cylindrical shape, institute
It states telescopic rod one end to fix with centre frame, the other end drives circular arc to do stretching motion in axis direction；Then support frame is held interior
Pressure pipe is supported；
(2) it is then spirally wound on the outer wall of pressure-bearing pipe using winding wall device by band is wound, and forms winding wall pipe, it is described
Winding wall device includes winding band follow-up device and rolling depressor, and winding band follow-up device draws winding band, rolling depressor be placed in winding band with
After into device roll bonding will be carried out between winding band and winding band；
(3) simultaneously spiral winding is spaced in winding wall pipe outer wall using winding pipe follow-up device；
(4) one layer of reinforcing strip, the reinforcing strip are wound using reinforcing strip follow-up device between the winding pipe of interval spiral surrounding
Width be greater than winding pipe between interval, between winding pipe, the both sides of reinforcing strip are pressed together on winding at the middle part of reinforcing strip
Then Guan Shang is pressed reinforcing strip and winding wall pipe and winding pipe using reinforcing strip cover；
(5) reinforced in the reinforcing strip between the winding pipe for being located at interval spiral surrounding using reinforced pipe follow-up device spiral surrounding
Pipe；
(6) it is wrapped around layer in outermost layer；And clad and the above-mentioned tubing wall pressure being formed by are closed using pressing device；
The preparation of B end socket:
(7) end socket is prepared using winding process, the end socket includes the socket envelope for having the bellmouth end socket of bellmouth and having socket
Then head carries out thermo-fuse to bellmouth end socket and inlays；Thermo-fuse is wavy copper wire；
The combination of C tubing main body and end socket:
(8) both ends of the tubing main body of above-mentioned preparation are carried out to welding or hot binding with two kinds of end sockets respectively, by end socket
Connection, is prepared a kind of modified winding structure composite pipe.
2. a kind of modified winding structure composite pipe according to claim 1, which is characterized in that the winding band
(8) it is equipped in internal layer and reinforces skeleton；The reinforcement skeleton (9) is intertwined to form netted by more reinforced wires (10).
3. a kind of modified winding structure composite pipe according to claim 1, which is characterized in that the winding inner tube
(7) it is structure as a whole with winding pipe (3), and is equipped with inside winding pipe (3) and reinforces skeleton (9), the reinforcement skeleton (9) is by more
Reinforced wire (10) is intertwined to form netted.
4. a kind of modified winding structure composite pipe according to claim 1, which is characterized in that support frame as described above encloses
It rotates around centre frame, and is moved radially along the direction of centre frame；Wind the winding of wall device and winding pipe follow-up device
It is contrary.
5. a kind of modified winding structure composite pipe according to claim 1, which is characterized in that the winding wall
It sets, winding pipe follow-up device, reinforcing strip follow-up device and reinforced pipe follow-up device while carrying out.
6. a kind of modified winding structure composite pipe according to claim 1, which is characterized in that the winding wall
Set, winding pipe follow-up device, reinforcing strip follow-up device and reinforced pipe follow-up device are slidably connected to respectively in different fixing axles,
And fixing axle is parallel with center bearing bracket.
7. a kind of modified winding structure composite pipe according to claim 1, which is characterized in that the winding wall
Follow-up device in setting is wound band is wound, and the overlapping widths between winding band and winding band are 0.5-2cm；The rolling depressor
For pressure roll, the pressure that the pressure roll applies is 0.2-0.5Mpa.
8. a kind of modified winding structure composite pipe according to claim 1, which is characterized in that reinforcing strip cover
Bottom interval is set there are two idler wheel, and idler wheel spacing and winding pipe match around interval, two idler wheel middle upper parts be equipped with one it is recessed
Shape wheel, the spill wheel and winding pipe match.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510812332.4A CN105387289B (en) | 2015-11-21 | 2015-11-21 | A kind of modified winding structure composite pipe and its preparation process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510812332.4A CN105387289B (en) | 2015-11-21 | 2015-11-21 | A kind of modified winding structure composite pipe and its preparation process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105387289A CN105387289A (en) | 2016-03-09 |
| CN105387289B true CN105387289B (en) | 2019-01-11 |
Family
ID=55419875
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510812332.4A Active CN105387289B (en) | 2015-11-21 | 2015-11-21 | A kind of modified winding structure composite pipe and its preparation process |
Country Status (1)
| Country | Link |
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| CN (1) | CN105387289B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108050312A (en) * | 2018-01-29 | 2018-05-18 | 安徽韵通管业有限公司 | A kind of modified winding structure composite pipe and its preparation process |
| CN113024930B (en) * | 2021-04-08 | 2022-08-12 | 四川潽鑫科技集团有限公司 | MPHDPE winding structure wall pipe and processing technology thereof |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2883851Y (en) * | 2006-01-26 | 2007-03-28 | 临沂市大通塑料管材有限公司 | Tubing having polythane wound structural wall |
| CN201964047U (en) * | 2011-01-31 | 2011-09-07 | 石家庄宝石克拉大径塑管有限公司 | Goods font-shaped pipe material with polyethylene-wound structure |
| CN202580349U (en) * | 2012-05-11 | 2012-12-05 | 山东融汇管通有限公司 | Tube framework reinforced composite plastic tube |
| CN204692798U (en) * | 2015-05-28 | 2015-10-07 | 湖北统塑管业有限公司 | Be wound around in a kind of steel disc and strengthen structured wall popes |
| CN205207942U (en) * | 2015-11-21 | 2016-05-04 | 郁世超 | Improved generation winding arrangement wall recombination pipe |
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| CN105387289A (en) | 2016-03-09 |
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Effective date of registration: 20181122 Address after: 311251 Tu Pu Dai village and Mu Ting Xu village, Lin Pu town, Xiaoshan District, Hangzhou, Zhejiang Applicant after: HONGSHENG PLASTICS (HANGZHOU) CO.,LTD. Address before: 311251 Japan's 1 Industrial Park, Xiaoshan, Hangzhou, Zhejiang Applicant before: Yu Shichao Applicant before: Zhou Maozhen |
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Denomination of invention: An improved winding structure wall composite pipe and its preparation process Effective date of registration: 20231108 Granted publication date: 20190111 Pledgee: Zhejiang Xiaoshan rural commercial bank Limited by Share Ltd. Lin Pu branch Pledgor: HONGSHENG PLASTICS (HANGZHOU) CO.,LTD. Registration number: Y2023980064552 |
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