CN109228385A - A kind of production technology of the PE solid wall pipe of high-orientation - Google Patents
A kind of production technology of the PE solid wall pipe of high-orientation Download PDFInfo
- Publication number
- CN109228385A CN109228385A CN201810895984.2A CN201810895984A CN109228385A CN 109228385 A CN109228385 A CN 109228385A CN 201810895984 A CN201810895984 A CN 201810895984A CN 109228385 A CN109228385 A CN 109228385A
- Authority
- CN
- China
- Prior art keywords
- prefabricated
- orientation
- plug
- band
- rubber ring
- Prior art date
- 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.)
- Pending
Links
Classifications
-
- 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
- B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
- B29C69/001—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore a shaping technique combined with cutting, e.g. in parts or slices combined with rearranging and joining the cut parts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/04—Polymers of ethylene
- B29K2023/06—PE, i.e. polyethylene
- B29K2023/0608—PE, i.e. polyethylene characterised by its density
- B29K2023/065—HDPE, i.e. high density polyethylene
-
- 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
- B29L2023/22—Tubes or pipes, i.e. rigid
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
A kind of production technology of the PE solid wall pipe of high-orientation includes the following steps: raw material mixture；Extruder heating squeezes out；Double orientation is drawn into band: circular tube shaped material base being drawn on the swollen body of round tube, axial and circumferential orientation is carried out；Prefabricated band is coiled；Coil restocking；Plug expansion；90 ° of cross windings of prefabricated band: involve two groups of prefabricated bands are wound on the plug of expansion, and two groups of prefabricated bands and mandrel axis winding angle are 45 °, and it is successively Wrapping formed to intersect progress between two groups of prefabricated bands at an angle of 90；High frequency partial heats adhesion；Layered Space air cooling；Circulation is wound into specified thickness；Plug retraction, tube body demoulding.Tensile strength, modulus and the impact flexibility of the orientation prefabricated band of invention method preparation expect that tubing thickness has sharp fall than existing non-oriented PE solid wall pipe, to reduce the cost of raw material much larger than non-oriented PE.
Description
Technical field
The present invention relates to a kind of production technologies of the PE solid wall pipe of high-orientation, belong to tubing technical field.
Background technique
Polyethylene (PE) pipe is one of most common pipeline, with excellent corrosion resistance, flexibility, lower temperature resistance etc.
Advantage, be widely used in water supply, draining, heat supply, in combustion gas, agricultural irrigation, hydraulic engineering and various commercial plants.It is existing
PE pipe production technology are as follows: raw material mixture-heating extrusion-mouth mold sizing-vacuum cooled sizing-second level cooling-traction-
Fixed length cutting.For the PE raw material of existing production technology in whole process, strand is in random aggregating state, and strand takes
It is small to spending, it is easy relaxation deformation after stress, PE cannot be embodied and manage good tensile strength, modulus and impact flexibility performance, led
It causes under uniform pressure and diameter, the thickness of PE pipeline is greater than the plastic pipes such as the PVC of same level, and disadvantage is bright in cost
It is aobvious, and hot-melt adhesive paste is used during the installation process, installation effectiveness is low, since operation causes a possibility that failing big, makes pipeline
The entire safety coefficient of system is affected.
Summary of the invention
The present invention is directed to prior art problem, a kind of production technology of the PE solid wall pipe of high-orientation is provided, using drawing
It stretches alignment method and melt blending method is prepared for orientation PE.PE prefabricated band tensile strength, modulus and impact flexibility after orientation are much
Expect greater than non-oriented PE, pipe thickness has sharp fall than existing non-oriented PE solid wall pipe, thus reduce raw material at
This, and can be disposable Wrapping formed for flare form, change PE pipe connection type, more efficient, safety.
Problem of the present invention is solved with following technical proposals:
A kind of production technology of the PE solid wall pipe of high-orientation, includes the following steps:
A, raw material mixture: by granular raw material according to high density polyethylene (HDPE) (HDPE): black masterbatch: processing aid=92 ~
The ratio mixture of 94.5:3 ~ 5:0.5 ~ 2；
B, extruder heating squeezes out: extruder is added in the raw material after mixture, after barrel heats and is plasticized uniformly, is expressed into
Mouth mold forms circular tube shaped material base；
C, double orientation is drawn into band: circular tube shaped material base being drawn on the swollen body of round tube, axial and circumferential orientation is carried out；The circle
Managing swollen body is sub warhead moulding, and surface is uniformly distributed little groove, inside grooves distributed pores, and outside blowing out pressurised air makes
Air cushion is formed between material base and the swollen body of round tube, prevents PE material and the swollen body adhesion of round tube, and as material base passes through the swollen body of round tube, material base
It is expanded in axial and circumferential direction, material base is stretched to 5-8 times of full size, and strand is in process of expansion from distortion reunion shape
State tangles status park to straight line, achieves the higher degree of orientation in axial and circumferential direction；
D, prefabricated band is coiled: will be cooled in air glass transition temperature or less by the material base being orientated after the swollen body of round tube；Material
Base is cut open along axial direction after the cooling period, with cutter, is formed flat belt-like, is further wound into；
E, it coils restocking: two groups of prefabricated band volumes is mounted on and can involve prefabricated band on the bracket of Mandrel Rotating；
F, plug expands: plug is made of continuous hollow rubber ring, and rubber ring surface is deformable cylinder, into hollow rubber ring
It is filled with high pressure gas, rubber ring expansion, deformable cylinder expands, and realizes plug expansion；
G, 90 ° of cross windings of prefabricated band: involve two groups of prefabricated bands are wound on the plug of expansion, two groups of prefabricated bands and plug
Axis winding angle is 45 °, and it is successively Wrapping formed to intersect progress between two groups of prefabricated bands at an angle of 90；
H, high frequency partial heats adhesion: prefabricated band is successively wound simultaneously, brings local heating into prefabricated, using plasma plus
Prefabricated band is heated to elastomeric state by heat, makes to generate adhesion between each winding layer, improves interlaminar strength；
I, Layered Space air cooling: the Wrapping formed PE pipe after high-frequency heating is subjected to air and blows cooling by force, drawn is taken
To PE pipe carry out shaping, prevent under elastomeric state, strand retraction, reduce the degree of orientation；
J, circulation is wound into specified thickness: according to applying working condition, prefabricated band being wound into specified thickness by step g；
K, plug bounces back, tube body demoulding: the hollow rubber ring in plug releases high pressure gas, and rubber ring bounces back, above rubber ring
Deformable cylinder lose support, diameter retraction, tube body demoulding.
The production technology of the PE solid wall pipe of above-mentioned high-orientation in the step a, carries out heat during raw material mixture
Wind drying, controls moisture content, and the concentration of mixed ingredients is less than 300ppm.
The production technology of the PE solid wall pipe of above-mentioned high-orientation, in the step h, high-frequency heating is heated at constant temperature, is added
Hot temperature is 130-150 DEG C.
Raw material are prepared into tool by three heating, extrusion, drawing-off steps by the first step by production technology of the present invention
There is the PE prefabricated band of high-orientation；Second by two groups of prefabricated bands according to 90 ° it is crisscross on the plug expanded carry out by
Layer winding successively carries out local heating, forming layer and layer to wound section in winding process so that PE is in control the high degree of orientation
Between adhesion, cooled down immediately after, prevent orientation strand retraction, be constantly wound into prefabricated band design thickness.This hair
The tensile strength of the orientation prefabricated band of bright method preparation can reach 30MPa or more, improve than the non-oriented PE tensile strength expected
About 1.5 times；Modulus reaches 4 × 109Pa, 2 times for expecting modulus for non-oriented PE；Impact flexibility (impact strength) reaches
30KJ/m2, about 1.5 times are improved, is expected much larger than non-oriented PE, tubing thickness has greatly than existing non-oriented PE solid wall pipe
Amplitude decline, to reduce the cost of raw material.In addition, the PE pipe of present invention process production can disposably be wound in flaring shape
Shape changes the connection type of PE pipe, more efficient, safer.
Detailed description of the invention
Fig. 1 is the degree of orientation of PE pipe of the present invention and the influence relational graph of tensile strength and elongation at break；
Fig. 2 is the relational graph of the PE pipe degree of orientation and impact strength；
Fig. 3 is influence diagram of the different orientation degree to the low temperature impact properties of PE；
Fig. 4 is the swollen body structural schematic diagram of round tube；
Fig. 5 is A-A sectional view in Fig. 4；
Fig. 6 is plug overall structure diagram；
Fig. 7 is A-A sectional view in Fig. 5；
Fig. 8 is hollow rubber ring structure schematic diagram；
Fig. 9 is hollow rubber ring side structure schematic view；
Figure 10 is steel frame construction schematic diagram；
Figure 11 is B-B sectional view in Fig. 9.
Figure label: 1, the swollen body of round tube；1-1, groove；1-2, stomata；2, plug；2-1, hollow rubber ring；2-2, it can be changed
Shape cylinder；2-3, steelframe；2-4, card slot；2-5, gas nozzle.
Specific embodiment
The invention will be further described with reference to embodiments:
A kind of production technology of the PE solid wall pipe of high-orientation, includes the following steps:
Raw material mixture: by granular raw material according to high density polyethylene (HDPE) (HDPE): black masterbatch: processing aid=92 ~ 94.5:3
The ratio mixture of ~ 5:0.5 ~ 2, raw material mixture carry out hot-air seasoning in the process, control moisture content, and the concentration of mixed ingredients is less than
300ppm；
Extruder heating squeezes out: extruder is added in the raw material after mixture, after barrel heats and is plasticized uniformly, is expressed into mouth
Mould forms circular tube shaped material base；
Double orientation is drawn into band: circular tube shaped material base being drawn on the swollen body 1 of round tube, axial and circumferential orientation is carried out；Referring to figure
4- Fig. 5, the swollen body 1 of round tube are sub warhead moulding, and surface is uniformly distributed little groove 1-1, distributed pores 1- inside groove 1-1
2, outside blowing out pressurised air makes to form air cushion between material base and the swollen body of round tube, prevent PE material with the swollen body adhesion of round tube, and with
Material base is expanded by the swollen body of round tube, material base in axial and circumferential direction, and material base is stretched to 5-8 times of full size, and strand exists
Status park is tangled from distortion aggregating state to straight line in process of expansion, achieves the higher degree of orientation in axial and circumferential direction；
Prefabricated band is coiled: will be cooled in air glass transition temperature or less by the material base being orientated after the swollen body of round tube；Material base
After the cooling period, it is cut open with cutter along axial direction, forms flat belt-like, be further wound into；
It coils restocking: two groups of prefabricated band volumes is mounted on and can involve prefabricated band on the bracket of Mandrel Rotating；
Plug expansion: plug 2 is made of continuous hollow rubber ring 2-1, and rubber ring surface is deformable cylinder 2-2, to hollow rubber
High pressure gas, rubber ring expansion are filled in rubber ring 2-1, deformable cylinder 2-2 expands, and realizes plug expansion；Referring to Fig. 6-Figure 11,
The plug 2 further includes steelframe 2-3, several card slots 2-4, the hollow rubber ring 2-1 clamping are provided on the steelframe 2-3
In the card slot 2-4 on steelframe 2-3, continuous rubber ring is formed；Be provided with gas nozzle 2-5 on the hollow rubber ring 2-1, for
High pressure gas is filled in rubber ring.
90 ° of cross windings of prefabricated band: involve two groups of prefabricated bands are wound on the plug of expansion, two groups of prefabricated bands and core
Mandrel winding angle is 45 °, and it is successively Wrapping formed to intersect progress between two groups of prefabricated bands at an angle of 90；
High frequency partial heats adhesion: prefabricated band is successively wound simultaneously, is brought local heating into prefabricated, is used plasma constant temperature
Heating, heating temperature are 130-150 DEG C, and prefabricated band is heated to elastomeric state, makes to generate adhesion between each winding layer, improves interlayer
Intensity；
Layered Space air cooling: the Wrapping formed PE pipe after high-frequency heating is subjected to air and blows cooling by force, drawn is orientated
PE pipe carry out shaping, prevent under elastomeric state, strand retraction, reduce the degree of orientation；
Circulation is wound into specified thickness: according to applying working condition, needed for being calculated according to the tensile strength of pipe material and safety coefficient
Prefabricated band is wound into specified thickness by the thickness wanted；
Plug retraction, tube body demoulding: the hollow rubber ring in plug releases high pressure gas, and rubber ring bounces back, above rubber ring
Deformable cylinder loses support, diameter retraction, and tube body demoulding obtains product.
Mechanics Performance Testing test is carried out to the PE pipeline of high-orientation obtained.
Referring to Fig. 1-Fig. 2, the tensile strength and impact strength of PE pipe increase afterwards as the increase of the degree of orientation shows first to reduce
The trend added, elongation at break then constantly decline, show the degree of orientation appropriate can relatively significantly improve polyethylene mechanics it is strong
Degree, and reduce the deformation rate of material in use.Referring to Fig. 3, low temperature impact properties shadow of the low orientated degree to polyethylene
Sound is smaller, and high-orientation then can significantly improve the low temperature impact strength of polyethylene.
Claims (3)
1. a kind of production technology of the PE solid wall pipe of high-orientation, which comprises the steps of:
A, raw material mixture: by granular raw material according to high density polyethylene (HDPE) (HDPE): black masterbatch: processing aid=92 ~
The ratio mixture of 94.5:3 ~ 5:0.5 ~ 2；
B, extruder heating squeezes out: extruder is added in the raw material after mixture, after barrel heats and is plasticized uniformly, is expressed into
Mouth mold forms circular tube shaped material base；
C, double orientation is drawn into band: circular tube shaped material base being drawn on the swollen body of round tube, axial and circumferential orientation is carried out；The circle
Managing swollen body is sub warhead moulding, and surface is uniformly distributed little groove, inside grooves distributed pores, and outside blowing out pressurised air makes
Air cushion is formed between material base and the swollen body of round tube, and as material base is by the swollen body of round tube, material base is expanded in axial and circumferential direction, expected
Base is stretched to 5-8 times of full size, and strand tangles status park from distortion aggregating state to straight line in process of expansion,
Axial and circumferential direction achieves the higher degree of orientation；
D, prefabricated band is coiled: will be cooled in air glass transition temperature or less by the material base being orientated after the swollen body of round tube；Material
Base is cut open along axial direction after the cooling period, with cutter, is formed flat belt-like, is further wound into；
E, it coils restocking: two groups of prefabricated band volumes is mounted on and can involve prefabricated band on the bracket of Mandrel Rotating；
F, plug expands: plug is made of continuous hollow rubber ring, and rubber ring surface is deformable cylinder, into hollow rubber ring
It is filled with high pressure gas, rubber ring expansion, deformable cylinder expands, and realizes plug expansion；
G, 90 ° of cross windings of prefabricated band: involve two groups of prefabricated bands are wound on the plug of expansion, two groups of prefabricated bands and plug
Axis winding angle is 45 °, and it is successively Wrapping formed to intersect progress between two groups of prefabricated bands at an angle of 90；
H, high frequency partial heats adhesion: prefabricated band is successively wound simultaneously, brings local heating into prefabricated, using plasma plus
Prefabricated band is heated to elastomeric state by heat, makes to generate adhesion between each winding layer；
I, Layered Space air cooling: the Wrapping formed PE pipe after high-frequency heating is subjected to air and blows cooling by force, drawn is taken
To PE pipe carry out shaping；
J, circulation is wound into specified thickness: according to applying working condition, prefabricated band being wound into specified thickness by step g；
K, plug bounces back, tube body demoulding: the hollow rubber ring in plug releases high pressure gas, and rubber ring bounces back, above rubber ring
Deformable cylinder lose support, diameter retraction, tube body demoulding.
2. the production technology of the PE solid wall pipe of high-orientation according to claim 1, it is characterised in that: the step a
In, hot-air seasoning is carried out during raw material mixture, the concentration of mixed ingredients is less than 300ppm.
3. the production technology of the PE solid wall pipe of high-orientation according to claim 1, it is characterised in that: the step h
In, high-frequency heating is heated at constant temperature, and heating temperature is 130-150 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810895984.2A CN109228385A (en) | 2018-08-08 | 2018-08-08 | A kind of production technology of the PE solid wall pipe of high-orientation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810895984.2A CN109228385A (en) | 2018-08-08 | 2018-08-08 | A kind of production technology of the PE solid wall pipe of high-orientation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109228385A true CN109228385A (en) | 2019-01-18 |
Family
ID=65070431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810895984.2A Pending CN109228385A (en) | 2018-08-08 | 2018-08-08 | A kind of production technology of the PE solid wall pipe of high-orientation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109228385A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111873388A (en) * | 2020-06-24 | 2020-11-03 | 安徽塑茂管道科技有限公司 | Inner and outer ring cooling equipment for Krah pipe production and operation method thereof |
| CN113334619A (en) * | 2021-04-19 | 2021-09-03 | 吕创业 | Isolated PE pipe prefabrication area production wind pressure inflation cutting device |
| CN115051306A (en) * | 2022-06-07 | 2022-09-13 | 青岛中集创赢复合材料科技有限公司 | Cable sheath pipe and preparation method thereof |
| CN115340714A (en) * | 2022-07-06 | 2022-11-15 | 宜宾天亿新材料科技有限公司 | Production method of oriented self-reinforced polyethylene pipe |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000079169A1 (en) * | 1999-06-18 | 2000-12-28 | Schlemmer Gmbh | Method for producing a corrugated tube comprising a slotted opening that extends along a contour line |
| CN101016965A (en) * | 2007-02-07 | 2007-08-15 | 李寿山 | Enhancement ultra-high molecular weight polyethylene wound pipe and manufacture method therefor |
| CN103171144A (en) * | 2011-12-21 | 2013-06-26 | 福建亚通新材料科技股份有限公司 | Biaxial orientation plastic tube manufacturing method and apparatus |
| CN106426864A (en) * | 2016-11-16 | 2017-02-22 | 华南理工大学 | Extrusion moulding method and device capable of quickly regulating wall thickness of pipe in stepless manner |
| CN108016026A (en) * | 2017-12-20 | 2018-05-11 | 江西金阳管业有限公司 | A kind of forming method of HDPE binary wall twisting and pipes |
-
2018
- 2018-08-08 CN CN201810895984.2A patent/CN109228385A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000079169A1 (en) * | 1999-06-18 | 2000-12-28 | Schlemmer Gmbh | Method for producing a corrugated tube comprising a slotted opening that extends along a contour line |
| CN101016965A (en) * | 2007-02-07 | 2007-08-15 | 李寿山 | Enhancement ultra-high molecular weight polyethylene wound pipe and manufacture method therefor |
| CN103171144A (en) * | 2011-12-21 | 2013-06-26 | 福建亚通新材料科技股份有限公司 | Biaxial orientation plastic tube manufacturing method and apparatus |
| CN106426864A (en) * | 2016-11-16 | 2017-02-22 | 华南理工大学 | Extrusion moulding method and device capable of quickly regulating wall thickness of pipe in stepless manner |
| CN108016026A (en) * | 2017-12-20 | 2018-05-11 | 江西金阳管业有限公司 | A kind of forming method of HDPE binary wall twisting and pipes |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111873388A (en) * | 2020-06-24 | 2020-11-03 | 安徽塑茂管道科技有限公司 | Inner and outer ring cooling equipment for Krah pipe production and operation method thereof |
| CN113334619A (en) * | 2021-04-19 | 2021-09-03 | 吕创业 | Isolated PE pipe prefabrication area production wind pressure inflation cutting device |
| CN115051306A (en) * | 2022-06-07 | 2022-09-13 | 青岛中集创赢复合材料科技有限公司 | Cable sheath pipe and preparation method thereof |
| CN115340714A (en) * | 2022-07-06 | 2022-11-15 | 宜宾天亿新材料科技有限公司 | Production method of oriented self-reinforced polyethylene pipe |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109228385A (en) | A kind of production technology of the PE solid wall pipe of high-orientation | |
| CN104149354B (en) | The production equipment and process of a kind of heavy caliber two-way stretch PVC | |
| US3058493A (en) | Flexible reinforced corrugated hose | |
| BG102303A (en) | Products based on orientated polymers | |
| CN103574187B (en) | Flexible superhigh molecular polyethylene compound pipe and preparation method thereof and production system | |
| CN101670665B (en) | Online biaxial-orienting PVC extrusion molding mould | |
| US20170065781A1 (en) | Tracheostomy tube assemblies, inner cannulae and methods of manufacture | |
| CN202082504U (en) | Fibre reinforced thermoplastic plastic pipe | |
| CN100421910C (en) | Inflating making process and apparatus of spiral wound steel wire reinforced composite plastic pipe | |
| CN101367953A (en) | Process for preparing water-soluble polyvinyl alcohol film | |
| US3589958A (en) | Method for the preparation of filament reinforced sheet | |
| CN105128323A (en) | Composite reinforced winding-type pressure pipe and forming method thereof | |
| CN105946192A (en) | Compound insulation pipe continuous production method and equipment thereof | |
| CN105172097B (en) | A kind of extrusion molding mould of online biaxial orientation plastics minor caliber pipe | |
| CN106493965B (en) | A kind of device and method of continuously elongated enhancing composite plastic pipe | |
| CN105196514B (en) | A kind of extrusion molding mould of online biaxial orientation plastics heavy caliber pipe | |
| CN102441997A (en) | Co-extrusion thermal winding structure wall pipe, processing method and die | |
| CN111333963A (en) | High-pressure-resistance rubber pipe and preparation method and application thereof | |
| CN107775970A (en) | Equipment and its application method for the production of thermoplastic continuous fibers' prepreg tape tubing | |
| CN107696466B (en) | Production method of PVC-O pipe | |
| US3221084A (en) | Manufacture of polyethylene film | |
| CN101204847A (en) | Slender glass steel flag stick and producing method and device with same | |
| JP6578054B2 (en) | Injection stack molding equipment for polymer piping | |
| CN216544625U (en) | Flat hose and production line | |
| US20080203624A1 (en) | Tubing Manufacture |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190118 |
|
| RJ01 | Rejection of invention patent application after publication |