CN104385647A - Low-elongation-percentage multilayer flexible pipe and manufacture method thereof - Google Patents
Low-elongation-percentage multilayer flexible pipe and manufacture method thereof Download PDFInfo
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- CN104385647A CN104385647A CN201410416798.8A CN201410416798A CN104385647A CN 104385647 A CN104385647 A CN 104385647A CN 201410416798 A CN201410416798 A CN 201410416798A CN 104385647 A CN104385647 A CN 104385647A
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- low elongation
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- 238000000034 method Methods 0.000 title claims abstract description 50
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 37
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 23
- 229920002803 thermoplastic polyurethane Polymers 0.000 claims description 19
- 238000005987 sulfurization reaction Methods 0.000 claims description 11
- 239000000835 fiber Substances 0.000 claims description 10
- 238000001125 extrusion Methods 0.000 claims description 7
- 244000043261 Hevea brasiliensis Species 0.000 claims description 3
- 229920003052 natural elastomer Polymers 0.000 claims description 3
- 229920001194 natural rubber Polymers 0.000 claims description 3
- 229920003051 synthetic elastomer Polymers 0.000 claims description 3
- 239000005061 synthetic rubber Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
- 229920002994 synthetic fiber Polymers 0.000 claims description 2
- 239000012209 synthetic fiber Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims 1
- 239000010410 layer Substances 0.000 description 82
- 239000004800 polyvinyl chloride Substances 0.000 description 22
- 239000004433 Thermoplastic polyurethane Substances 0.000 description 18
- 239000012790 adhesive layer Substances 0.000 description 16
- 239000008188 pellet Substances 0.000 description 12
- 238000004381 surface treatment Methods 0.000 description 10
- 239000012530 fluid Substances 0.000 description 9
- 239000000956 alloy Substances 0.000 description 8
- 229910045601 alloy Inorganic materials 0.000 description 8
- 238000004073 vulcanization Methods 0.000 description 8
- 239000000047 product Substances 0.000 description 7
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 6
- 229920000459 Nitrile rubber Polymers 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 6
- 230000001070 adhesive effect Effects 0.000 description 6
- 239000002131 composite material Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 238000007664 blowing Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000004781 supercooling Methods 0.000 description 4
- 229920006231 aramid fiber Polymers 0.000 description 3
- 239000000470 constituent Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229920001778 nylon Polymers 0.000 description 3
- 229920000742 Cotton Polymers 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 2
- 229920004933 Terylene® Polymers 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000001723 curing Methods 0.000 description 2
- 238000013007 heat curing Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000011265 semifinished product Substances 0.000 description 2
- 239000003079 shale oil Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 230000007306 turnover Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 210000002268 wool Anatomy 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009954 braiding Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D23/00—Producing tubular articles
- B29D23/001—Pipes; Pipe joints
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/22—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2009/00—Layered products
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
- B29L2023/005—Hoses, i.e. flexible
Abstract
The invention provides a low-elongation-percentage multilayer flexible pipe and a manufacture method thereof. The method comprises the following steps: manufacturing a first layer, a second layer and a third layer of the flexible pip; introducing the first layer into the third layer; vulcanizing the first layer and the third layer, and stretching the first layer and the third layer along a direction basically parallel to the length direction; and introducing the second layer into the vulcanized first and third layers, and valcunizing. The method is capable of effectively reducing the elongation percentage of the multilayer flexible pipe while keeping the rebound resilience of the multilayer flexible pipe, thereby improving the usage performance of the multilayer flexible pipe.
Description
technical field:
The present invention relates to a kind of low elongation multi-layer flexible pipe and manufacture method thereof, relate to a kind of low elongation fluid conveying multi-layer flexible pipe and manufacture method thereof especially, more particularly relate to a kind of low elongation shale oil-gas mining fracturing fluid conveying multi-layer flexible pipe and manufacture method thereof, belong to fluid and transmit equipment technology field.
background technology:
Current exploitation shale oil gas is normally used is hydraulic fracturing technology, and this technology utilizes fracturing fluid pressure break lithosphere, to discharge shale oil gas.Transport fracturing fluid needs the conveyance conduit using middle and long distance, conveyance conduit mainly flexible pipe conventional at present.
The advantages such as it is high that flexible pipe has pressure-bearing, and feed flow is large, and easy to connect, weatherability chemical resistance is good, can adapt to different terrain landforms, is flat when non-working condition, easy rolling, and storage transportation volume is little.Existing fluid-conveying hose is made up of multilayer usually, and outermost layer and earth surface, shield; Intermediate layer, is also enhancement layer, is usually formed by fibrage, plays a part to strengthen pipeline strength; Innermost layer and the liquid comes into contact carried, usually manufactured by corrosion-resistant material.
summary of the invention:
Existing flexible pipe manufacture method can be selected coextruding method or turn over band method.Turning over band method makes relatively simple, and yield in unit time is high, and equipment investment is less, and the hose size good stability produced, has good rebound performance after a procedure.In use, the pressure of fluid can make the length of the flexible pipe turned over manufactured by band method increase usually.
The object of this invention is to provide a kind of low elongation multi-layer flexible pipe and manufacture method thereof, effectively can reduce the percentage elongation of the flexible pipe of production, keep its rebound performance simultaneously, thus promote the serviceability of multi-layer flexible pipe.
During not to be subject to the effect of tube fluid pressure, hose length is for initial length, and the percentage elongation of flexible pipe refers to, when the effect being subject to power, and the difference of hose length and initial length and the ratio of initial length.
As this description and in running through below claims use, " one ", " one " and " one " and " being somebody's turn to do " are also intended to comprise plural form, unless context clearly indicates other situations.Employ step or element that term " comprises " and " comprising " is intended to comprise the method identified herein, but such step or element do not form exclusive list, method or equipment can comprise extra step or element.
Below, for without loss of generality, when describing multi-layer flexible pipe structure, use " ground floor ", " second layer ", " third layer " these nouns, these nouns only represent the order that referred to parts occur in the text, and its position in flexible pipe non-limiting, simultaneously, " ground floor ", " second layer ", the noun itself that " third layer " is similar are not expressed or this layer described in implying is single structure, and this layer also can be composite construction.
The manufacture method of low elongation multi-layer flexible pipe, the method comprises the following steps:
(1) ground floor of flexible pipe is manufactured: the raw material of ground floor can use high molecule plastic, natural rubber, synthetic rubber etc.The manufacture of ground floor can adopt method well-known to those skilled in the art, includes but not limited to extrusion molding.Optionally, this layer can attach adhesive;
(2) second layer of flexible pipe is manufactured: the raw material of the second layer can use high molecule plastic, natural rubber, synthetic rubber etc., and its concrete chemical constituent can be the same with ground floor, also can be different.The manufacture of the second layer can adopt method well-known to those skilled in the art, includes but not limited to extrusion molding.Optionally, this layer can attach adhesive;
(3) respectively the ground floor obtained in step (1) and step (2) and the second layer are carried out surface treatment: the surface treatment method of ground floor and the second layer can be the same or different;
(4) manufacture third layer: third layer can by fiber by braiding, hot sticky, chemical adhesion etc. in interior method manufacture, wherein fiber can select the synthetic fibers etc. such as the natural fibers such as cotton fiber, flaxen fiber, wool fiber or nylon fiber, polyster fibre, aramid fiber;
(5) bonding between ground floor and third layer: the ground floor after surface treatment will be carried out in step (3) by using hauling machine or other mode of traction, introducing third layer is inner, the outer surface of ground floor is contacted with the inner surface of third layer, and sulfuration is carried out to ground floor and third layer, the mode of sulfuration can be room temperature vulcanization, also can be heat cure or cold cure etc., its mode of operation changes with the chemical constituent of ground floor and third layer and change of properties, and high-temperature gas can be hot-air, high-pressure water vapor or other gas here.In this step, can select to stretch to flexible pipe;
(6) turn over band: as required, can select to carry out inside and outside upset to the product of step (5), make ground floor become outer by internal layer, the mode of upset can be by the pressure of fluid, mechanical traction or other modes.After turning over band, can as required, select product to carry out surperficial roller aperture.
(7) bonding between the second layer and third layer: will carry out the second layer after surface treatment in step (3) by using hauling machine or other mode of traction, introduces in the product that step (6) obtains, and sulfuration.The mode of sulfuration can be identical or different with the vulcanization in step (5).Vulcanization can be room temperature vulcanization, also can be heat cure or cold cure etc., and its concrete operations mode changes with the chemical constituent of the second layer and third layer and change of properties, and high-temperature gas can be hot-air, high-pressure water vapor or other gas here.In this step, can as required, flexible pipe be stretched.
Can carry out in any one step in step (5) with step (7) the operation that body stretches, also all can carry out in step (5) with step (7).In these two steps, the step of stretching can be identical with mode, also can be different.
The concrete steps stretched can have multiple, include but not limited to following example: preset body elongation after the stretch, and disposable stretching, until body arrives this length value, can be selected after stopping stretching maintaining a period of time; Preset each elongation of body in multi-drawing and total elongation, then by multi-drawing until body arrives total elongation, can select to maintain a period of time after stopping stretching; Body one end is connected with an object, presets the numerical value that one acts on the pulling force on body, keep this pulling force size constant, by this object stretching body, until body is no longer elongated, after stopping stretching, this length a period of time can be maintained.
The mode stretched can be mechanical traction, extruding or additive method.Mechanical traction can be realized by hauling machine, also by other modes.When using hauling machine, one end of body can be fixed, connecting the other end of hauling machine and body, by hauling machine, tractive force being applied to body; Also can apply tractive force to body at two ends by hauling machine simultaneously; Also can apply tractive force in the multiple positions on body simultaneously; Also can whole or almost whole body applies tractive force in the mode of approaches uniformity.The mode of extruding can be the object utilizing rigidity, pressure is produced to pipeline, its length is caused to increase, such as realized by following method: at body, one or more object is installed outward, this object definitions size is less than the hole of body bore, by making body pass this hole, the frictional force between object and body is utilized to realize the stretching of body.Additive method comprises the power beyond to body applying tractive force, frictional force form, consequently causes the length of body to increase.
Be only concrete example to the description of stretched operation above, should not be considered to be the embodiment of unique feasible.Obviously, for those skilled in the art, after the general principle understanding stretched operation, may when not deviating from this principle, various correction in form and details and change are carried out to the concrete steps implementing to stretch and mode, but these are revised and change still within scope described above.
Beneficial effect:
1. the technical program can reduce multi-layer flexible pipe percentage elongation at work effectively.Such as, do not adopt the multi-layer flexible pipe that drawing process manufactures, percentage elongation under operating pressure may >=4%, and according to the multi-layer flexible pipe that the technical program manufactures, the percentage elongation under operating pressure can≤1%.
2. according to the multi-layer flexible pipe of the technical program manufacture, there is good bore rebound performance, use middle multi-layer flexible pipe bore to have stability, after removing fluid pressure, can substantially return to original bore.
detailed description of the invention:
Embodiment 1:
The manufacture method of the low elongation multi-layer flexible pipe of the present embodiment comprises the following steps:
(1) ground floor manufactured with adhesive layer is extruded: ground floor pellet and adhesive pellet are expressed in a co-extruding mould via two extruders, co-extrusion composite bed is out through supercooling, traction is flattened and is formed flat tube and be ground floor with adhesive layer, wherein adhesive layer thickness is 0.10-0.35mm, ground floor thickness is 0.5-4.0mm, ground floor adopts TPU(thermoplastic polyurethane) pellet or TPU/PVC(polyvinyl chloride) alloy, part by weight TPU:PVC=100:0-70 in described TPU/PVC alloy;
(2) second layer manufactured with adhesive layer is extruded: second layer pellet and adhesive pellet are expressed in a co-extruding mould via two extruders, co-extrusion composite bed is out through supercooling, traction is flattened and is formed flat tube and be the second layer with adhesive layer, wherein adhesive layer thickness is 0.10-0.35mm, second layer thickness is 0.5-4.0mm, the second layer adopts TPU pellet or TPU/PVC alloy or PVC or PVC/ acrylonitrile-butadiene rubber, TPU:PVC=100:0-70 by weight in described TPU/PVC alloy; In described PVC/ acrylonitrile-butadiene rubber by weight PVC: acrylonitrile-butadiene rubber=100:0-70;
(3) respectively the semi-finished product obtained in step (1) and step (2) are carried out surface treatment: immersed after carrying out Physical penetration in the solution that methyl diphenylene diisocyanate (be called for short MDI, adopt BASF M20S in the present embodiment) is made into by the part by weight of 10-30:70-90 as solvent as curing agent and ethyl acetate for subsequent use;
(4) manufacture third layer: by product design specification (PDS), be the third layer of tubulose by warp and weft knit, third layer thickness 1.5-5.0mm, its middle longitude and parallel adopt the combination of a kind of in terylene, nylon, aramid fiber or two kinds;
(5) bonding between ground floor and third layer: the traction of the ground floor with adhesive layer after surface treatment inlet pipe shape third layer will be carried out in step (3), two ends fixedly pass into the steam that pressure is 0.10-0.35MPa, after hose surface temperature reaches 120 ° of C, by hauling machine, flexible pipe is stretched, the percentage elongation stretched is 5%, after 4-10 minute, the pressurize of row's steam blowing air is cooled to the temperature of requirement;
(6) band is turned over: make the product internal layer of step (5) become outer;
(7) bonding between the second layer and third layer: the second layer with adhesive layer after carrying out surface treatment in step (3) is led in the product that introduction step (6) obtains, two ends fixedly pass into the steam that pressure is 0.10-0.35MPa, after 4-10 minute, row's steam, blowing air pressurize, is cooled to the temperature of requirement.
Embodiment 2:
The manufacture method of the low elongation multi-layer flexible pipe of the present embodiment comprises the following steps:
(1) ground floor manufactured with adhesive layer is extruded: ground floor pellet and adhesive pellet are expressed in a co-extruding mould via two extruders, co-extrusion composite bed is out through supercooling, traction is flattened and is formed flat tube and be ground floor with adhesive layer, wherein adhesive layer thickness is 0.10-0.35mm, ground floor thickness is 0.5-4.0mm, ground floor adopts TPU(thermoplastic polyurethane) pellet or TPU/PVC(polyvinyl chloride) alloy, part by weight TPU:PVC=100:0-70 in described TPU/PVC alloy;
(2) second layer manufactured with adhesive layer is extruded: second layer pellet and adhesive pellet are expressed in a co-extruding mould via two extruders, co-extrusion composite bed is out through supercooling, traction is flattened and is formed flat tube and be the second layer with adhesive layer, wherein adhesive layer thickness is 0.10-0.35mm, second layer thickness is 0.5-4.0mm, the second layer adopts TPU pellet or TPU/PVC alloy or PVC or PVC/ acrylonitrile-butadiene rubber, TPU:PVC=100:0-70 by weight in described TPU/PVC alloy; In described PVC/ acrylonitrile-butadiene rubber by weight PVC: acrylonitrile-butadiene rubber=100:0-70;
(3) respectively the semi-finished product obtained in step (1) and step (2) are carried out surface treatment: immersed after carrying out Physical penetration in the solution that methyl diphenylene diisocyanate (be called for short MDI, adopt BASF M20S in the present embodiment) is made into by the part by weight of 10-30:70-90 as solvent as curing agent and ethyl acetate for subsequent use;
(4) manufacture third layer: by product design specification (PDS), be the third layer of tubulose by warp and weft knit, third layer thickness 1.5-5.0mm, its middle longitude and parallel adopt the combination of a kind of in terylene, nylon, aramid fiber or two kinds;
(5) bonding between ground floor and third layer: the traction of the ground floor with adhesive layer after surface treatment inlet pipe shape third layer will be carried out in step (3), two ends fixedly pass into the steam that pressure is 0.10-0.35MPa, after 4-10 minute, the pressurize of row's steam blowing air is cooled to the temperature of requirement;
(6) band is turned over: make the product internal layer of step (5) become outer;
(7) bonding between the second layer and third layer: the second layer with adhesive layer after carrying out surface treatment in step (3) is led in the product that introduction step (6) obtains, two ends fixedly pass into the steam that pressure is 0.10-0.35MPa, after hose surface temperature reaches 120 ° of C, by hauling machine, flexible pipe is stretched, the percentage elongation stretched is after 5%, 4-10 minute, row's steam, blowing air pressurize, is cooled to the temperature of requirement.
Embodiment 3:
The difference of the present embodiment and embodiment 1 is: the present embodiment carries out the step of surperficial roller aperture after being also included in step (6).
Embodiment 4:
The difference of the present embodiment and embodiment 1 is: the third layer in the present embodiment adopts the natural fibers such as cotton fiber, flaxen fiber, wool fiber to manufacture.
Embodiment 5:
The difference of the present embodiment and embodiment 1 is: the manufacture method of the low elongation multi-layer flexible pipe of the present embodiment is: between ground floor and third layer during logical steam vulcanization (cure), after hose surface temperature reaches 125 ° of C, stretch to flexible pipe, the percentage elongation of stretching is 3%.
Embodiment 6:
The difference of the present embodiment and embodiment 1 is: the manufacture method of the low elongation multi-layer flexible pipe of the present embodiment is: between ground floor and third layer during logical steam vulcanization (cure), after hose surface temperature reaches 126 ° of C, stretch to flexible pipe, the percentage elongation of stretching is 1%.
Embodiment 7:
The difference of the present embodiment and embodiment 1 is: the manufacture method of the low elongation multi-layer flexible pipe of the present embodiment is: between ground floor and third layer during logical steam vulcanization (cure), after hose surface temperature reaches 125 ° of C, stretch to flexible pipe, the percentage elongation of stretching is 5%.
Embodiment 8:
The difference of the present embodiment and embodiment 1 is: the manufacture method of the low elongation multi-layer flexible pipe of the present embodiment is: between ground floor and third layer during logical steam vulcanization (cure), after hose surface temperature reaches 122 ° of C, stretch to flexible pipe, the percentage elongation of stretching is 2%.
Be appreciated that advantage as described above can relate to an embodiment and maybe can relate to multiple embodiment.Each embodiment is not limited to the embodiment solving any or all in described problem or the embodiment of any or all had in described benefit and advantage.
The step of method described herein in appropriate circumstances with any suitable order, or can realize simultaneously.In addition, when not departing from the spirit and scope of theme described herein, each independent step can be deleted from any one method.The each side of any example as described above can combine with each side of any example in other described examples, to form further example, and can not lose the effect of seeking.
Above description is only specific embodiments of the invention, should not be considered to be unique embodiment.Obviously; for those skilled in the art, after understanding content of the present invention and principle, all may when not deviating from the principle of the invention, structure; carry out the various correction in form and details and change, but these are revised and change still within claims of the present invention.
Claims (10)
1. a manufacture method for low elongation multi-layer flexible pipe, is characterized in that: the method comprises the following steps:
Manufacture the ground floor of flexible pipe, the second layer and third layer;
Ground floor is introduced in third layer;
To ground floor and third layer sulfuration, the direction along its length stretches to ground floor and third layer;
In the ground floor second layer being introduced sulfuration and third layer, sulfuration.
2. the manufacture method of low elongation multi-layer flexible pipe according to claim 1, is characterized in that: described stretching is that the method adopting traction to stretch completes.
3. the manufacture method of low elongation multi-layer flexible pipe according to claim 1 and 2, is characterized in that: this manufacture method carries out the inside and outside step overturn after being also included in the step to ground floor and third layer sulfuration.
4. the manufacture method of low elongation multi-layer flexible pipe according to claim 3, is characterized in that: this manufacture method carries out the step of surperficial roller aperture after being also included in and carrying out the inside and outside step overturn to ground floor and third layer.
5. the manufacture method of the low elongation multi-layer flexible pipe according to claim 1 or 2 or 4, is characterized in that: at least one deck in ground floor and the second layer is manufactured by extrusion method.
6. the manufacture method of the low elongation multi-layer flexible pipe according to claim 1 or 2 or 4, is characterized in that: ground floor and/or the second layer comprise at least one material in TPU, PVC, natural rubber and synthetic rubber.
7. the manufacture method of the low elongation multi-layer flexible pipe according to claim 1 or 2 or 4, is characterized in that: third layer comprises natural fiber, synthetic fibers or its mixture.
8. adopt the low elongation multi-layer flexible pipe obtained by method of one of claim 1-7, it is characterized in that: the percentage elongation of described multi-layer flexible pipe is not more than 1%.
9. a manufacture method for low elongation multi-layer flexible pipe, is characterized in that: the method comprises the following steps:
Manufacture the ground floor of flexible pipe, the second layer and third layer;
Ground floor is introduced in third layer, to ground floor and third layer sulfuration;
In the ground floor second layer being introduced sulfuration and third layer;
To the second layer, ground floor and third layer sulfuration, stretch along the direction being roughly parallel to its length.
10. the manufacture method of low elongation multi-layer flexible pipe according to claim 9, is characterized in that: the length that after stretching, multi-layer flexible pipe increases is 1% to 5% relative to the ratio of length when not stretching.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410416798.8A CN104385647B (en) | 2014-08-22 | 2014-08-22 | Low elongation multi-layer flexible pipe and its manufacture method |
| PCT/CN2014/086910 WO2016026192A1 (en) | 2014-08-22 | 2014-09-19 | Reduced-streatchability multilayer tube and manufacturing method therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410416798.8A CN104385647B (en) | 2014-08-22 | 2014-08-22 | Low elongation multi-layer flexible pipe and its manufacture method |
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| Publication Number | Publication Date |
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| CN104385647A true CN104385647A (en) | 2015-03-04 |
| CN104385647B CN104385647B (en) | 2017-12-15 |
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| WO (1) | WO2016026192A1 (en) |
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| EP1684967B1 (en) * | 2003-11-07 | 2010-12-29 | Insituform Holdings (UK) Limited | Longitudinally reinforced cured in place liner |
| CN102729501A (en) * | 2012-06-28 | 2012-10-17 | 安徽都邦电器有限公司 | Production method for silicon rubber reinforced hose |
| CN103612376A (en) * | 2013-10-18 | 2014-03-05 | 五行材料科技（江苏）有限公司 | Fracturing liquid conveying flexible pipe for exploiting shale oil gas, manufacturing method thereof and co-extrusion mold |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104385647B (en) | 2017-12-15 |
| WO2016026192A1 (en) | 2016-02-25 |
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Denomination of invention: Low elongation multilayer hose and its manufacturing method Effective date of registration: 20210401 Granted publication date: 20171215 Pledgee: Jiangyan Jiangsu rural commercial bank Limited by Share Ltd. Pledgor: 5ELEM HI-TECH Corp. Registration number: Y2021980002332 |
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Denomination of invention: Low elongation multi-layer hose and its manufacturing method Granted publication date: 20171215 Pledgee: Jiangyan Jiangsu rural commercial bank Limited by Share Ltd. Pledgor: 5ELEM HI-TECH Corp. Registration number: Y2024320000056 |