CN113786961A - Device for coating inner wall of tubular substrate - Google Patents
Device for coating inner wall of tubular substrate Download PDFInfo
- Publication number
- CN113786961A CN113786961A CN202110979674.0A CN202110979674A CN113786961A CN 113786961 A CN113786961 A CN 113786961A CN 202110979674 A CN202110979674 A CN 202110979674A CN 113786961 A CN113786961 A CN 113786961A
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- China
- Prior art keywords
- sample tube
- wall
- aerosol
- supporting rod
- tube
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- 239000000758 substrate Substances 0.000 title claims abstract description 17
- 239000011248 coating agent Substances 0.000 title claims abstract description 16
- 238000000576 coating method Methods 0.000 title claims abstract description 16
- 239000000443 aerosol Substances 0.000 claims abstract description 43
- 238000010438 heat treatment Methods 0.000 claims abstract description 30
- 238000005507 spraying Methods 0.000 claims abstract description 10
- 238000011049 filling Methods 0.000 claims description 7
- 238000010521 absorption reaction Methods 0.000 claims description 5
- 238000009413 insulation Methods 0.000 claims description 5
- 230000006698 induction Effects 0.000 claims description 2
- 230000006835 compression Effects 0.000 claims 1
- 238000007906 compression Methods 0.000 claims 1
- 239000010408 film Substances 0.000 abstract description 15
- 238000000034 method Methods 0.000 abstract description 7
- 238000000889 atomisation Methods 0.000 abstract description 6
- 239000002245 particle Substances 0.000 abstract description 6
- 239000010409 thin film Substances 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 239000008263 liquid aerosol Substances 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 3
- 239000012265 solid product Substances 0.000 abstract description 3
- 238000000935 solvent evaporation Methods 0.000 abstract description 3
- 238000005979 thermal decomposition reaction Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 24
- 239000000463 material Substances 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 239000012159 carrier gas Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002277 temperature effect Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C7/00—Apparatus specially designed for applying liquid or other fluent material to the inside of hollow work
- B05C7/06—Apparatus specially designed for applying liquid or other fluent material to the inside of hollow work by devices moving in contact with the work
- B05C7/08—Apparatus specially designed for applying liquid or other fluent material to the inside of hollow work by devices moving in contact with the work for applying liquids or other fluent materials to the inside of tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
- B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
- B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
- B05C11/1042—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material provided with means for heating or cooling the liquid or other fluent material in the supplying means upstream of the applying apparatus
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C13/00—Means for manipulating or holding work, e.g. for separate articles
- B05C13/02—Means for manipulating or holding work, e.g. for separate articles for particular articles
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
- C03C17/001—General methods for coating; Devices therefor
- C03C17/003—General methods for coating; Devices therefor for hollow ware, e.g. containers
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention provides a device for coating a film on the inner wall of a tubular substrate, which comprises a sample tube, a driving assembly, a reciprocating transverse moving assembly and a hollow supporting rod, wherein the driving assembly can fix the sample tube and drive the sample tube to rotate, the supporting rod and the sample tube are coaxially arranged, the reciprocating transverse moving assembly is used for driving the supporting rod to move in a reciprocating mode along the length direction of the sample tube, an aerosol inlet tube and a tail gas outlet tube are contained in the supporting rod, and the end part of the supporting rod, which extends into the sample tube, is a spraying unit with a fan-shaped section. When the temperature reaches the preset process temperature, the aerosol inlet pipe starts to take in aerosol (the aerosol is liquid aerosol and comes from an atomization source), aerosol particles are transported to the tail gas outlet pipe in a crevice formed between the heating element and the inner wall of the sample pipe, and due to the temperature, the aerosol particles are subjected to solvent evaporation and solute thermal decomposition reaction, and solid products after the reaction are adsorbed and deposited on the inner wall of the sample pipe to form a thin film.
Description
Technical Field
The invention relates to the technical field of coating, in particular to a device for coating the inner wall of a tubular substrate.
Background
In scientific research and production practice, thin film materials have very wide application. The film is made on the surface of the base material, so that multiple functions of rust prevention, wear resistance, corrosion prevention, insulation, electric conduction, reflection enhancement or reflection reduction and the like can be realized. The shape of the substrate is also very diverse, planar, curved, irregular, etc. Among them, the circular tube-shaped substrate is a common one of the non-planar substrates. At present, dozens of film preparation methods have been developed, but none of the methods can realize the preparation of all films, and the selection of a proper preparation method according to the conditions of film components, structures, substrate characteristics and the like is fundamental work in scientific research and production practice.
An oxide film, in particular an electrothermal film with tin dioxide as the main component, is prepared on the inner wall of a round tubular sample made of glass, quartz or ceramic materials, and is very common in various occasions needing heating and heat preservation. The film is prepared by a physical gas phase method, so that the film has high quality, but the energy consumption is high and the cost is high. The preparation by a wet chemical method is technically feasible, but the film cannot be used at a higher temperature, and the prepared film is also seriously polluted (waste liquid and waste gas).
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a device for coating the inner wall of a tubular base material based on an ultrasonic atomization pyrolysis spraying technology, which solves the problems in the background technology.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: a device for coating a film on the inner wall of a tubular substrate comprises a sample tube, a driving assembly, a reciprocating transverse moving assembly and a hollow supporting rod, wherein the driving assembly can fix the sample tube and drive the sample tube to rotate, the supporting rod is coaxially arranged with the sample tube, the reciprocating transverse moving assembly is used for driving the supporting rod to move in a reciprocating mode along the length direction of the sample tube, an aerosol inlet tube and a tail gas outlet tube are contained in the supporting rod, the end part of the supporting rod, which extends into the sample tube, is a spraying unit with a fan-shaped cross section, the spraying unit comprises a fan-shaped shell, a heating element, a heat insulation filling layer, an aerosol nozzle and a tail gas absorption inlet, the aerosol nozzle and the tail gas suction inlet are positioned at two corners of the fan-shaped shell and are narrow rectangular cross sections, the heating element is positioned at the top of the fan-shaped shell, and the heat insulation filling layer is positioned at the inner side of the heating element, the one end of aerosol induction tube is connected the atomizing source, and the aerosol spout is connected to the other end, the tail gas sunction inlet is connected to the one end of tail gas absorption entry, and the other end extends outside the bracing piece, the gas of aerosol spout spun gets into the tail gas sunction inlet along between heating element and the sample tube inner wall and forms sectorial return channel.
Preferably, one surface of the heating element corresponding to the sample tube is arc-shaped, and the distance between the arc surface at the top of the heating element and the inner wall of the sample tube is 2 +/-0.5 mm.
Preferably, the circumferential angle of the sector-shaped housing is between 30 and 45 °.
Preferably, the heating element comprises a temperature thermocouple.
Preferably, drive assembly includes two groups of wheels, and each group of wheel has included two from driving wheel and a drive wheel, the sample pipe support is established between two follow driving wheels and a drive wheel, and adjacent two drive wheels, follow and pass through drive wheel connecting shaft between the driving wheel and connect, coaxial coupling has driving motor on the drive wheel.
Preferably, the driving wheel is pressed against the outer wall of the sample tube with a certain pressure by a pressure lever and a tension spring.
(III) advantageous effects
The invention provides a device for coating the inner wall of a tubular substrate. The method has the following beneficial effects:
1. the device for coating the inner wall of the circular tubular base material inputs carrier gas with a certain flow along the aerosol inlet pipe, and the tail gas outlet pipe synchronously starts to work. When the temperature reaches the preset process temperature, the aerosol inlet pipe starts to take in aerosol (the aerosol is liquid aerosol and comes from an atomization source), aerosol particles are transported to the tail gas outlet pipe in a crevice formed between the heating element and the inner wall of the sample pipe, and due to the temperature, the aerosol particles are subjected to solvent evaporation and solute thermal decomposition reaction, and solid products after the reaction are adsorbed and deposited on the inner wall of the sample pipe to form a thin film.
Drawings
FIG. 1 is a schematic side sectional view of the present invention;
FIG. 2 is a schematic plan view of the present invention;
fig. 3 is a front view of the exhaust suction inlet and the aerosol nozzle of the present invention.
In the figure: the device comprises a pressure rod 1, a rope pulling spring 2, a driving wheel 3, a sample tube 4, a tail gas suction inlet 5, an aerosol nozzle 6, a heat insulation filling layer 7, a heating element 8, a driven wheel 9, a driving motor 10, a tail gas delivery tube 11, an aerosol inlet tube 12, a supporting rod 13 and a driving wheel connecting shaft 14.
Detailed Description
The embodiment of the invention provides a device for coating a film on the inner wall of a circular tubular substrate, which comprises a sample tube 4, a driving assembly, a reciprocating transverse moving assembly and a hollow support rod 13, as shown in figures 1-3.
The driving assembly can fix the sample tube 4 and drive the sample tube 4 to rotate, the driving assembly comprises two groups of wheels, each group of wheels comprises two driven wheels 9 and one driving wheel 3, the sample tube 4 is erected between the two driven wheels 9 and the one driving wheel 3, the two adjacent driving wheels 3 and the driven wheels 9 are connected through a driving wheel connecting shaft 14, and the driving wheels 3 are coaxially connected with a driving motor 10. The end of a driving wheel connecting shaft 14 connected with the driving wheel 3 is pivoted on the pressure lever 1, an extension spring 2 is arranged between the bottom of the pressure lever 1 and the carrier, and the driving wheel 3 is pressed on the outer wall of the sample tube 4 with certain pressure through the pressure lever 1 and the extension spring 2. The driving wheel 3 can be separated from the sample tube 4 by pulling the pressure lever 1 upwards. The end of the driving wheel connecting shaft 14 connected with the driven wheel 9 is pivoted on the carrier.
The support rod 13 and the sample tube 4 are coaxially arranged, the reciprocating transverse moving component is used for driving the support rod 13 to move in a reciprocating mode along the length direction of the sample tube 4, and the reciprocating transverse moving component can be a screw rod sliding rail mechanism or an air cylinder. The support rod 13 includes an aerosol inlet tube 12 and a tail gas outlet tube 11 for respectively leading in and leading out aerosol atomization solution. The end of the supporting rod 13 extending into the sample tube 4 is a spraying unit with a fan-shaped section, the spraying unit comprises a fan-shaped shell, a heating element 8, a heat-insulating filling layer 7, an aerosol nozzle 6 and a tail gas absorption inlet 5, the aerosol nozzle 6 and the tail gas suction inlet 5 are positioned at two corners of the fan-shaped shell and have narrow rectangular sections, the heating element 8 is positioned at the top of the fan-shaped shell, the heat-insulating filling layer 7 is positioned at the inner side of the heating element 8, one end of the aerosol lead-in tube 12 is connected with an atomization source, the other end of the aerosol nozzle 6 is connected with one end of the tail gas absorption inlet 5, the other end of the aerosol nozzle extends out of the supporting rod 13, and a lead of the heating element 8 is also led out of the hollow supporting rod 13. The gas sprayed out from the aerosol nozzle 6 enters the tail gas suction inlet 5 along the space between the heating element 8 and the inner wall of the sample tube 4 to form a fan-shaped backflow channel.
One surface of the heating element 8 corresponding to the sample tube 4 is arc-shaped, and the distance between the arc surface at the top of the heating element 8 and the inner wall of the sample tube 4 is a uniform gap of 2 +/-0.5 mm. The circumferential angle of the sector-shaped housing is between 30 and 45 deg..
The heating element 8 comprises a temperature thermocouple. Is a commercially available product that is currently used to monitor the temperature of the heating element 8.
The working principle is as follows: after the sample tube 4 is clamped and fixed, the driving wheel 3 drives the sample tube to rotate at a certain angular speed by the friction force between the driving wheel and the outer wall of the sample tube 4 under the driving of the driving motor 10, and the rotating direction is as shown in fig. 1. A carrier gas is supplied at a predetermined flow rate along the aerosol inlet pipe 12, and the exhaust gas outlet pipe 11 is operated simultaneously. When the temperature reaches the predetermined process temperature, the aerosol introduction tube 12 starts to receive aerosol (the aerosol is liquid aerosol and comes from the atomization source), aerosol particles are transported to the exhaust gas delivery tube 11 in the crevice formed between the heating element 8 and the inner wall of the sample tube 4, and due to the temperature effect, the aerosol particles are subjected to solvent evaporation and solute thermal decomposition reaction, and the reacted solid products are adsorbed and deposited on the inner wall of the sample tube 4 to form a thin film. The tail gas after the reaction is discharged through a tail gas delivery pipe 11. The tail gas suction inlet 5 and the aerosol nozzle 6 are in a bell mouth shape near the inner part of the sample tube 4, the gap between one side edge of the tail gas suction inlet 5 and the aerosol nozzle 6 far away from the heating element 8 and the inner wall of the sample tube 4 is far smaller than the gap between the heating element 8 and the inner wall of the sample tube 4, and the gap is 0.4-0.7mm (the thickness of a finally deposited film needs to be considered, and the film is prevented from being scraped). Usually, the length of the sample tube 4 is greater than that of the spraying unit, and the spraying unit moves at a constant speed along the axis of the sample tube 4 along with the support rod 13 to form spiral line-like scanning on the inner wall of the sample tube 4. According to the actual product requirements, the axial reciprocating times and the axial reciprocating speed of the supporting rod 13 along the sample tube 4 can be set within a certain range.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A device for coating the inner wall of a tubular substrate is characterized in that: the device comprises a sample tube (4), a driving assembly, a reciprocating transverse moving assembly and a hollow supporting rod (13), wherein the driving assembly can fix the sample tube (4) and drive the sample tube (4) to rotate, the supporting rod (13) and the sample tube (4) are coaxially arranged, the reciprocating transverse moving assembly is used for driving the supporting rod (13) to reciprocate along the length direction of the sample tube (4), the supporting rod (13) internally comprises an aerosol lead-in tube (12) and a tail gas lead-out tube (11), the end part of the supporting rod (13) extending into the sample tube (4) is a spraying unit with a fan-shaped section, the spraying unit comprises a fan-shaped shell, a heating element (8), a heat insulation filling layer (7), an aerosol nozzle (6) and a tail gas absorption inlet (5), the aerosol nozzle (6) and the tail gas suction inlet (5) are positioned at two corners of the fan-shaped shell and are narrow rectangular sections, heating element (8) are located the top of fan-shaped casing, thermal-insulated filling layer (7) are located the inboard of heating element (8), the atomizing source is connected to the one end of aerosol induction tube (12), and aerosol spout (6) are connected to the other end, tail gas absorbs the one end of entry (5) and connects tail gas sunction inlet (5), and the other end extends to outside bracing piece (13), aerosol spout (6) spun gas gets into tail gas sunction inlet (5) and forms sectorial return channel along between heating element (8) and sample tube (4) inner wall.
2. The apparatus for coating the inner wall of the tubular substrate according to claim 1, wherein: one surface of the heating element (8) corresponding to the sample tube (4) is arc-shaped, and the distance between the arc surface at the top of the heating element (8) and the inner wall of the sample tube (4) is 2 +/-0.5 mm.
3. The apparatus for coating the inner wall of the tubular substrate according to claim 2, wherein: the circumferential angle of the sector-shaped housing is between 30 and 45 degrees.
4. The apparatus for coating the inner wall of the tubular substrate according to claim 1, wherein: the heating element (8) comprises a temperature thermocouple.
5. The apparatus for coating the inner wall of the tubular substrate according to claim 1, wherein: the driving assembly comprises two groups of wheels, each group of wheels comprises two driven wheels (9) and one driving wheel (3), the sample tube (4) is erected between the two driven wheels (9) and the driving wheel (3), the two adjacent driving wheels (3) and the driven wheels (9) are connected through a driving wheel connecting shaft (14), and the driving wheels (3) are coaxially connected with a driving motor (10).
6. The apparatus for coating the inner wall of the tubular substrate according to claim 5, wherein: the driving wheel (3) is pressed on the outer wall of the sample tube (4) with certain pressure through the compression rod (1) and the extension spring (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110979674.0A CN113786961A (en) | 2021-08-25 | 2021-08-25 | Device for coating inner wall of tubular substrate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110979674.0A CN113786961A (en) | 2021-08-25 | 2021-08-25 | Device for coating inner wall of tubular substrate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113786961A true CN113786961A (en) | 2021-12-14 |
Family
ID=79182101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110979674.0A Pending CN113786961A (en) | 2021-08-25 | 2021-08-25 | Device for coating inner wall of tubular substrate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113786961A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2624404A1 (en) * | 1987-12-15 | 1989-06-16 | Commissariat Energie Atomique | Method for covering a long cylindrical surface with a uniform layer of particles |
| CN1143544A (en) * | 1995-05-12 | 1997-02-26 | 埃尔帕特朗尼股份公司 | Method and apparatus for coating container bodies internally |
| CN2590322Y (en) * | 2002-12-17 | 2003-12-03 | 乐清市新型技术研究所 | Heating type electro thermal film warming pipe film spraying machine |
| CN106423649A (en) * | 2016-11-01 | 2017-02-22 | 重庆理工大学 | Continuous production-type ultrasonic atomization spraying film-coating equipment |
| CN111545391A (en) * | 2020-05-13 | 2020-08-18 | 中国海洋大学 | Device for spraying oxide film on outer side surface of circular tube |
| CN112024309A (en) * | 2020-09-22 | 2020-12-04 | 瑞思泰环保科技(南通)有限公司 | Anticorrosive coating device for inner pipe wall of metal pipeline |
-
2021
- 2021-08-25 CN CN202110979674.0A patent/CN113786961A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2624404A1 (en) * | 1987-12-15 | 1989-06-16 | Commissariat Energie Atomique | Method for covering a long cylindrical surface with a uniform layer of particles |
| CN1143544A (en) * | 1995-05-12 | 1997-02-26 | 埃尔帕特朗尼股份公司 | Method and apparatus for coating container bodies internally |
| CN2590322Y (en) * | 2002-12-17 | 2003-12-03 | 乐清市新型技术研究所 | Heating type electro thermal film warming pipe film spraying machine |
| CN106423649A (en) * | 2016-11-01 | 2017-02-22 | 重庆理工大学 | Continuous production-type ultrasonic atomization spraying film-coating equipment |
| CN111545391A (en) * | 2020-05-13 | 2020-08-18 | 中国海洋大学 | Device for spraying oxide film on outer side surface of circular tube |
| CN112024309A (en) * | 2020-09-22 | 2020-12-04 | 瑞思泰环保科技(南通)有限公司 | Anticorrosive coating device for inner pipe wall of metal pipeline |
Non-Patent Citations (1)
| Title |
|---|
| 罗以喜: "非织造布的金属化整理", 《非织造布》 * |
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Application publication date: 20211214 |
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| RJ01 | Rejection of invention patent application after publication |