CN114887854A - Powder spraying process for container - Google Patents
Powder spraying process for container Download PDFInfo
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- CN114887854A CN114887854A CN202210537060.1A CN202210537060A CN114887854A CN 114887854 A CN114887854 A CN 114887854A CN 202210537060 A CN202210537060 A CN 202210537060A CN 114887854 A CN114887854 A CN 114887854A
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- Prior art keywords
- container
- powder
- room
- flour
- spraying process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/36—Successively applying liquids or other fluent materials, e.g. without intermediate treatment
- B05D1/38—Successively applying liquids or other fluent materials, e.g. without intermediate treatment with intermediate treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
- B05D1/12—Applying particulate materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0254—After-treatment
- B05D3/0263—After-treatment with IR heaters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
- B05D3/0406—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases the gas being air
- B05D3/0413—Heating with air
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/52—Two layers
- B05D7/54—No clear coat specified
- B05D7/546—No clear coat specified each layer being cured, at least partially, separately
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention belongs to the technical field of container spraying, and particularly relates to a powder spraying process of a container. The powder spraying process of the container comprises the following steps: powder spraying is carried out on the container by a spray gun of the bottom powder room; and a spray gun of the flour powder room is used for spraying powder on the container. The spraying of the base powder and the flour is respectively carried out on the outer side surface and the inner side surface of the container, the whole container and the local complex structure of the container are coated at one time, and the coating of all the coatings is good. The base powder and the flour of the container are baked in the spraying process, so that the base powder and the flour are attached and solidified on the outer side surface and the inner side surface of the container. Compared with the traditional container paint coating process, the powder spraying process has the advantages of higher automation degree, stronger corrosion resistance of the container, lower environmental pollution and lower production cost, and is suitable for popularization and application in related fields.
Description
Technical Field
The invention belongs to the technical field of container spraying, and particularly relates to a powder spraying process of a container.
Background
The container is a kind of combined tool which can be loaded with packaged or unpacked goods for transportation and is convenient for loading, unloading and carrying by mechanical equipment. The container is composed of a steel structure main body, wood floors and other accessories, and specifically comprises a top plate, side plates, a front end, a door end, a bottom frame and the wood floors arranged on the bottom frame. In the using process of the container, the range of the service environment of the container is wide, and the variation range of the humidity and the temperature of the working environment of the container is wide, so that special coating operation needs to be carried out on the main steel structure part of the container.
The traditional container protective paint coating consumes a large amount of organic solvent, generates a large amount of waste water and waste residues, and has a problem of pollution which always troubles the industry. According to the measurement and calculation of 300 ten thousand TEU of the annual production container, if the powder coating process is adopted to replace the current water-based paint coating process, the annual consumption of the coating in the whole industry is expected to be reduced to about 7.5 ten thousand tons, and the three wastes can be reduced each year: VOCs about 1.2 ten thousand tons, paint spraying waste water about 70.31 ten thousand tons and waste paint slag about 4.17 ten thousand tons. It has been found through research that powder spraying of containers is the only feasible solution to the problem.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides the following solution.
The equipment required by the powder spraying process of the container comprises a bottom powder room and a flour room, wherein one side of the bottom powder room is provided with a box-entering hanging crane, the other side of the bottom powder room is provided with a bottom powder drying room and a bottom powder cooling room, one side of the flour room is provided with a box-exiting hanging crane, the other side of the flour room is provided with a flour drying room and a flour cooling room, and the bottom powder room and the flour room are both provided with spray guns.
The powder spraying process of the container specifically comprises the following steps:
the method comprises the following steps: the container is hoisted by the container-entering hoisting crane and is moved to the bottom powder room;
step two: powder spraying is carried out on the container by a spray gun of the bottom powder room;
step three: transporting the container to a bottom powder drying room, and baking the bottom powder of the container to enable the bottom powder to be attached and solidified on the outer side surface and the inner side surface of the container;
step four: after baking the base powder, transporting the container to a base powder cooling room for cooling;
step five: the cooled container is transported to a flour powder room;
step six: powder spraying is carried out on the container by a spray gun of the flour powder room;
step seven: transporting the container to a flour drying room, and baking the flour in the container to enable the flour to be attached and solidified on the outer side surface and the inner side surface of the container;
step eight: after baking the flour, transporting the container to a flour cooling room for cooling;
step nine: and (4) conveying the cooled container to a container outlet, and moving the container after spraying to a ground guide rail by a container outlet overhead crane.
Preferably, in the second step, the spray gun of the bottom powder room respectively performs powder spraying on the outer side surface and the inner side surface of the container, wherein the thickness of the powder sprayed on the outer side of the container is 30-60 microns; the thickness of the powder sprayed on the inside of the container is 30-80 microns.
Preferably, in the third step, the time period of baking the base powder of the container by the base powder baking room is set to be 10-20 minutes, and the baking temperature is set to be 90-150 ℃.
Preferably, in the sixth step, the spray gun of the flour powder room respectively performs powder spraying on the outer side surface and the inner side surface of the container, wherein the thickness of the powder sprayed on the outer side of the container is 40-100 microns; the thickness of the powder sprayed on the inside of the container is 30-80 microns.
Preferably, in the seventh step, the time period for baking the flour of the container by the flour baking room is set to be 20-40 minutes, and the baking temperature is set to be 160-220 ℃.
Preferably, in the baking process of the container bottom powder and the flour, the part of the steel structure plate of the container, the thickness of which is more than 4.5 mm, is subjected to supplementary heating, and the supplementary heating time is set to be 2.5-6 minutes.
Preferably, the bottom powder drying room and the flour drying room both adopt natural gas as a heat source to carry out hot air circulation heating on the container.
Preferably, the bottom powder drying room and the flour drying room both adopt natural gas as a heat source to carry out natural gas infrared heating on the container.
Preferably, in the fourth step, the container is transported to a bottom powder cooling room for cooling, and the surface temperature of the cooled container body is lower than 80 ℃.
Preferably, in the step eight, the container is transported to a flour cooling room for cooling, and the surface temperature of the cooled container body is lower than 90 ℃.
The container powder spraying process changes the severe working environment of the traditional container coating line, and the powder is odorless, clean and sanitary, and the environmental quality is obviously improved. The technological process of the present invention has the outer surface and the inner surface of the container painted with base powder and flour separately, and the container is painted in once step with local complicated structure and has excellent coating. The base powder and the flour of the container are baked in the spraying process, so that the base powder and the flour are attached and solidified on the outer side surface and the inner side surface of the container.
The powder spraying process has high automation degree, improves the corrosion resistance of the container, reduces the pollution to the environment, saves the production cost, and is suitable for popularization and application in related fields.
Drawings
In order to more clearly explain the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that for those skilled in the art, other related drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic view of powder spraying of the present invention;
FIG. 2 is a schematic view of the flour powder spray of the present invention;
fig. 3 is a schematic diagram of the powder spraying process for the container of the present invention.
In the figure: 1. entering a box and hanging; 2. a base powder chamber; 21. a base powder drying room; 22. a bottom powder cooling room; 3. a flour powder room; 31. a flour drying room; 32. a flour cooling room; 4. a spray gun; 5. and (5) taking out the box and hanging the box.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
To make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.
Thus, the following detailed description of the embodiments of the present application, as presented in the figures, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments obtained by a person skilled in the art without any inventive step based on the embodiments in this application belong to the present application
The scope of protection.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and thus should not be considered limiting.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Example one
As shown in fig. 1 and 2, the equipment required by the powder spraying process of the container of the invention comprises a bottom powder room 2 and a flour powder room 3, wherein one side of the bottom powder room 2 is provided with a box-entering hanging crane 1, the other side of the bottom powder room 2 is provided with a bottom powder drying room 21 and a bottom powder cooling room 22, one side of the flour powder room 3 is provided with a box-exiting hanging crane 5, the other side of the flour powder room 3 is provided with a flour drying room 31 and a flour cooling room 32, and the bottom powder room 2 and the flour powder room 3 are both provided with a spray gun 4.
And (5) carrying out shot blasting treatment on the welding seam part after the whole container steel structure is assembled. The welding seam of the whole container after shot blasting treatment is more firm and corrosion resistant.
As shown in fig. 3, the powder spraying process of the container specifically includes the following steps:
the method comprises the following steps: the container is hoisted by the container-entering hoisting crane and is moved to the bottom powder room;
step two: powder spraying is carried out on the container by a spray gun of the bottom powder room;
step three: transporting the container to a bottom powder drying room through suspension type conveying equipment, and baking the bottom powder of the container to enable the bottom powder to be attached and solidified on the outer side surface and the inner side surface of the container;
step four: after the base powder is baked, the container is transported to a base powder cooling room by a suspension type conveying device for cooling;
step five: the cooled container is transported to a flour powder room through a suspension type conveying device;
step six: powder spraying is carried out on the container by a spray gun of the flour powder room;
step seven: the container is conveyed to a flour drying room by the suspension type conveying equipment, and the flour of the container is dried to be adhered and solidified on the outer side surface and the inner side surface of the container;
step eight: after baking the flour, conveying the container to a flour cooling room by using suspension type conveying equipment for cooling;
step nine: and the cooled container is conveyed to a container outlet through a suspension type conveying device, and the container outlet is hoisted to move the container after being sprayed to a ground guide rail.
It should be noted that the suspension conveyor apparatus mentioned in this embodiment refers to various apparatuses that can convey containers, including but not limited to a stacking chain.
Example two
As shown in fig. 1 and 2, the equipment required by the powder spraying process of the container of the invention comprises a bottom powder room 2 and a flour powder room 3, wherein one side of the bottom powder room 2 is provided with a box-entering hanging crane 1, the other side of the bottom powder room 2 is provided with a bottom powder drying room 21 and a bottom powder cooling room 22, one side of the flour powder room 3 is provided with a box-exiting hanging crane 5, the other side of the flour powder room 3 is provided with a flour drying room 31 and a flour cooling room 32, and the bottom powder room 2 and the flour powder room 3 are both provided with a spray gun 4.
And (5) carrying out shot blasting treatment on the welding seam part after the whole container steel structure is assembled. The welding seam of the whole container after shot blasting treatment is more firm and corrosion resistant.
As shown in fig. 3, the powder spraying process of the container specifically includes the following steps:
the method comprises the following steps: and the container is lifted by the container-entering hoisting crane and moved to the bottom powder room.
Step two: and a spray gun of the bottom powder room is used for spraying powder on the container.
Specifically, a spray gun of the bottom powder room is used for respectively spraying powder on the outer side surface and the inner side surface of the container, wherein the thickness of the powder sprayed on the outer side of the container is 30-60 microns; the thickness of the powder sprayed on the inside of the container is 30-80 microns.
Step three: and the container is transported to a bottom powder drying room by the accumulating chain, and the bottom powder of the container is dried to be adhered and solidified on the outer side surface and the inner side surface of the container.
Specifically, the time period of baking the bottom powder of the container by the bottom powder baking room is set to be 10-20 minutes, and the baking temperature is set to be 90-150 ℃.
Further, the bottom powder drying room adopts natural gas as a heat source to heat the container in a hot air circulation manner.
Furthermore, the bottom powder drying room can also adopt natural gas as a heat source to carry out natural gas infrared heating on the container.
In addition, in the process of baking the container bottom powder, the part of the steel structure plate of the container, the thickness of which is more than 4.5 mm, is subjected to supplementary heating, and the supplementary heating time is set to be 2.5-6 minutes.
Step four: and after the bottom powder is baked, the container is transported to a bottom powder cooling room by the accumulating and releasing chain to be cooled.
Specifically, the container is transported to a bottom powder cooling room for cooling, and the surface temperature of the cooled container body is lower than 80 ℃.
Step five: and the cooled container is transported to a flour powder room through a stacking chain.
Step six: and a spray gun of the flour powder room is used for spraying the powder on the container.
Specifically, a spray gun of the flour powder room is used for respectively spraying powder on the outer side surface and the inner side surface of the container, wherein the thickness of the powder sprayed on the outer side of the container is 40-100 microns; the thickness of the powder sprayed on the inside of the container is 30-80 microns.
Step seven: the container is transported to a flour drying room by the accumulating chain, and the flour of the container is baked, so that the flour is adhered and solidified on the outer side surface and the inner side surface of the container.
Specifically, the flour baking time of the flour baking room for the container is set to be 20-40 minutes, and the baking temperature is set to be 160-220 ℃.
Furthermore, the flour drying room adopts natural gas as a heat source to heat the container in a hot air circulation manner.
Furthermore, the flour drying room can also adopt natural gas as a heat source to carry out natural gas infrared heating on the container.
In addition, in the baking process of the container flour, the part of the steel structure plate of the container with the thickness more than 4.5 mm is subjected to supplementary heating, and the supplementary heating time is set to be 2.5-6 minutes.
Step eight: after the flour is baked, the container is transported to a flour cooling room by the accumulating and releasing chain for cooling.
Specifically, the container is transported to a flour cooling room for cooling, and the surface temperature of the cooled container body is lower than 90 ℃.
Step nine: and the cooled container is transported to a container outlet through a stacking chain, and the container outlet is hoisted to move the container after being sprayed to a ground guide rail.
By adopting the powder spraying process, the total thickness of the base powder and the flour on the outer surface of the container is not less than 90 microns; the total thickness of the base powder and the flour on the inner side surface of the container is not less than 90 microns.
The powder spraying process of the invention is used for respectively spraying the base powder and the flour on the outer side surface and the inner side surface of the container, and the whole container and the local complex structure of the container are coated at one time, so that the coating of the whole coating is good. The base powder and the flour of the container are baked in the spraying process, so that the base powder and the flour are attached and solidified on the outer side surface and the inner side surface of the container.
The powder spraying process has high automation degree, improves the corrosion resistance of the container, reduces the pollution to the environment, saves the production cost, and is suitable for popularization and application in related fields.
Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the embodiments. Thus, the present embodiments are not intended to be limited to the embodiments shown herein but are to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention shall be included in the scope of the present invention.
Claims (10)
1. A powder spraying process for a container is characterized by comprising the following steps: the equipment required by the powder spraying process comprises a bottom powder room and a flour powder room, wherein the bottom powder room is provided with a box-in and box-out overhead crane, the bottom powder room is matched with a bottom powder drying room and a bottom powder cooling room, the flour powder room is provided with a box-in and box-out overhead crane, the flour powder room is matched with a flour drying room and a flour cooling room, and the bottom powder room and the flour powder room are both provided with a spray gun and a powder recovery system;
the powder spraying process of the container specifically comprises the following steps:
the method comprises the following steps: the container is lifted by the in-out box crane and moved into the ground powder room;
step two: powder spraying is carried out on the container by a spray gun of the bottom powder room;
step three: transporting the container to a bottom powder drying room, and baking the bottom powder of the container to enable the bottom powder to be attached and solidified on the outer side surface and the inner side surface of the container;
step four: after baking the base powder, transporting the container to a base powder cooling room for cooling;
step five: the cooled container is transported to a flour powder room;
step six: powder spraying is carried out on the container by a spray gun of the flour powder room;
step seven: transporting the container to a flour drying room, and baking the flour in the container to enable the flour to be attached and solidified on the outer side surface and the inner side surface of the container;
step eight: after baking the flour, transporting the container to a flour cooling room for cooling;
step nine: and (4) conveying the cooled container to a container outlet, and moving the sprayed container to a ground guide rail by the container in and out overhead crane.
2. The powder spraying process for the container as claimed in claim 1, wherein in the second step, the spray gun of the bottom powder room is used for respectively performing powder spraying on the outer side surface and the inner side surface of the container, wherein the thickness of the powder sprayed on the outer side of the container is 30-60 microns; the thickness of the powder sprayed on the inside of the container is 30-80 microns.
3. The powder spraying process for the container as claimed in claim 1, wherein in the third step, the baking time of the bottom powder baking room for the container is set to 10-20 minutes, and the baking temperature is set to 90-150 ℃.
4. The powder spraying process for the container as claimed in claim 1, wherein in the sixth step, the spray guns of the flour powder room respectively perform powder spraying on the outer side surface and the inner side surface of the container, wherein the thickness of the powder sprayed on the outer side of the container is 40-100 microns; the thickness of the powder sprayed on the inside of the container is 30-80 microns.
5. The powder spraying process for the container as claimed in claim 1, wherein in the seventh step, the baking time of the flour for the container by the flour baking room is set to be 20-40 minutes, and the baking temperature is set to be 160-220 ℃.
6. The powder spraying process for the container as claimed in claim 3 or 5, wherein in the baking process of the container base powder and the flour, the part of the steel structure plate of the container with the thickness of more than 4.5 mm is subjected to supplementary heating, and the supplementary heating time is set to be 2.5-6 minutes.
7. The powder spraying process for the container as claimed in claim 3 or 5, wherein the bottom powder drying room and the flour drying room both adopt natural gas as a heat source to carry out hot air circulation heating on the container.
8. The powder spraying process for the container as claimed in claim 7, wherein the bottom powder drying room and the flour drying room both use natural gas as a heat source to carry out natural gas infrared heating on the container.
9. The powder spraying process for the container as claimed in claim 1, wherein in the fourth step, the container is transported to a base powder cooling room for cooling, and the surface temperature of the cooled container body is lower than 80 ℃.
10. The powder spraying process for the container as claimed in claim 1, wherein in the step eight, the container is transported to a flour cooling room for cooling, and the surface temperature of the cooled container body is lower than 90 ℃.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210537060.1A CN114887854A (en) | 2022-05-18 | 2022-05-18 | Powder spraying process for container |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210537060.1A CN114887854A (en) | 2022-05-18 | 2022-05-18 | Powder spraying process for container |
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| CN114887854A true CN114887854A (en) | 2022-08-12 |
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