CN113445104A - Long-tail ticket folder color electrophoretic paint treatment process - Google Patents
Long-tail ticket folder color electrophoretic paint treatment process Download PDFInfo
- Publication number
- CN113445104A CN113445104A CN202110798472.6A CN202110798472A CN113445104A CN 113445104 A CN113445104 A CN 113445104A CN 202110798472 A CN202110798472 A CN 202110798472A CN 113445104 A CN113445104 A CN 113445104A
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- long
- tail ticket
- tail
- binder
- ticket holder
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000003973 paint Substances 0.000 title claims abstract description 15
- 239000011230 binding agent Substances 0.000 claims abstract description 46
- 238000001035 drying Methods 0.000 claims abstract description 31
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 30
- 238000001962 electrophoresis Methods 0.000 claims abstract description 26
- 239000002253 acid Substances 0.000 claims abstract description 20
- 239000004576 sand Substances 0.000 claims abstract description 18
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000004140 cleaning Methods 0.000 claims abstract description 11
- 239000011248 coating agent Substances 0.000 claims abstract description 9
- 238000000576 coating method Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000005507 spraying Methods 0.000 claims abstract description 6
- 229910052742 iron Inorganic materials 0.000 claims abstract description 3
- 239000007788 liquid Substances 0.000 claims description 16
- 239000007921 spray Substances 0.000 claims description 6
- 229910019142 PO4 Inorganic materials 0.000 claims description 3
- 241000221535 Pucciniales Species 0.000 claims description 3
- 239000008367 deionised water Substances 0.000 claims description 3
- 229910021641 deionized water Inorganic materials 0.000 claims description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 3
- 239000010452 phosphate Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 238000005498 polishing Methods 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 3
- 238000007127 saponification reaction Methods 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 abstract description 3
- -1 simultaneously Substances 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 23
- 238000003756 stirring Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 230000003472 neutralizing effect Effects 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000004401 flow injection analysis Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D13/00—Electrophoretic coating characterised by the process
- C25D13/12—Electrophoretic coating characterised by the process characterised by the article coated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B31/00—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor
- B24B31/02—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor involving rotary barrels
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
- C23G1/19—Iron or steel
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D13/00—Electrophoretic coating characterised by the process
- C25D13/20—Pretreatment
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Electrochemistry (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses a process for treating a binder of a long-tail ticket by using a color electrophoretic paint, which sequentially comprises the working procedures of pretreatment, acid liquor removal, drying, sorting, phosphorization, drying and preheating, electrophoresis, cleaning and coating curing, wherein fine sand is used for polishing the binder of the long-tail ticket to remove foreign matters and iron rust, a large number of binders of the long-tail ticket can be processed simultaneously, the polishing is uniform, the binder of the long-tail ticket is not easy to damage, in addition, the fine sand can be recycled, the binder is green and environment-friendly, cavitation jet is used for spraying sodium hydroxide solution to remove the fine sand, simultaneously, oil stains on the surface of the binder of the long-tail ticket can be subjected to saponification reaction, oil stains can be conveniently removed, unqualified products can be sorted, the waste of subsequent processing materials can be prevented, the temperature of the dried binder of the long-tail ticket is cooled to electrophoresis, the electrophoresis treatment can be prevented from being influenced when the binder of the long-tail ticket is subjected to electrophoresis, the temperature of the electrophoresis can be conveniently controlled, and when the coating is cured, drying water firstly and curing the coating to ensure the smoothness of the paint surface.
Description
Technical Field
The invention relates to the technical field of processing of long-tail ticket folders, in particular to a long-tail ticket folder color electrophoretic paint treatment process.
Background
The long-tail ticket holder is a metal file holder, generally formed by assembling a bent folded metal sheet and two bent metal strips, and is commonly used in offices and other occasions to arrange and fix files and conveniently fix a plurality of pieces of paper together.
When going on the japanning through the electrophoresis to the binder of long tail, because it is less to buckle inside gap, be difficult for removing rust polishing to can influence the holistic japanning effect of binder of long tail, in addition, when carrying out large batch binder processing, get rid of operations such as the foreign matter on its surface, rust and oil stain more troublesome, moreover, during the electrophoresis, the temperature that large batch binder of long tail got into the electrophoresis tank and can directly influence the electrophoresis liquid influences the japanning effect.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention discloses a long-tail ticket holder color electrophoretic paint treatment process which can solve the defect that the operations of surface rust removal, cleaning and drying are inconvenient when the long-tail ticket holder is painted.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme:
a long-tail ticket-holder color electrophoretic paint treatment process comprises the following steps: step 1, pretreatment: a. the long-tail ticket holder is placed in a roller filled with fine sand, and the fine sand and the long-tail ticket holder rub when the roller rotates, so that the long-tail ticket holder is polished to remove foreign matters and iron rust attached to the surface; b. placing the polished long tail ticket holder in a collecting device with a filter screen and conveying the long tail ticket holder through a conveying belt, and removing fine sand and oil stains attached to the surface of the long tail ticket holder by using a cavity jet nozzle right above the conveying belt, wherein the cavitation jet is sprayed by a sodium hydroxide solution, and the concentration of the sodium hydroxide solution is 5% -8%; c. immersing the collecting device with the long-tail ticket holder into an acid solution, stirring simultaneously, and further removing rust on the surface of the long-tail ticket holder, wherein the pH value of the acid solution is 4 +/-0.2, and the immersion time is 1-2 min;
step 2, removing acid liquor: carrying out cavitation jet spraying twice to remove residual acid liquor on the surface of the long-tail ticket holder, wherein deionized water is sprayed out by the cavitation jet spraying twice;
and step 3, drying: the long-tail ticket clip collecting device sprays hot air to the long-tail ticket clip through a drying channel to remove the moisture on the surface of the long-tail ticket clip, and the temperature in the drying channel is 80-90 ℃;
step 4, sorting: picking out the long tail ticket holder with the surface attached with the stains or rusts, and repeating the steps 1, 2 and 3;
and step 5, phosphorization: fixing the sorted long-tail ticket folder on a hanger, conveying and immersing the long-tail ticket folder in phosphate solution to form a phosphating film on the surface of the long-tail ticket folder, wherein free acid is 0.8-1.0 point, total acid is 18-20 points, and phosphating time is 30-60 s;
step 6, drying and preheating: passing the phosphatized long-tail ticket holder through a drying channel, drying the moisture on the surface of the long-tail ticket holder, standing and cooling to the temperature of the electrophoretic liquid, wherein the temperature in the drying channel is 120 ℃;
and 7, electrophoresis: immersing the long-tail ticket holder into an electrophoresis tank and conveying the long-tail ticket holder under the fixation of a hanger, wherein the conveying direction of the long-tail ticket holder is opposite to the circulating flow direction of liquid in the electrophoresis tank, a paint surface is formed on the surface of the long-tail ticket holder, the temperature of the electrophoresis liquid is 25-30 ℃, and the electrophoresis time is 2-3 min;
step 8, cleaning: d. carrying out UF1 and UF2 spray rinsing on the long tail ticket holder; e. then, carrying out two times of pure water cleaning on the long tail ticket holder, and matching with stirring the long tail ticket holder in the cleaning process;
step 9, curing the coating: the binder passes through a drying channel, the moisture on the surface of the binder is dried, and the coating on the surface of the binder is solidified, the solidification process is divided into two steps, firstly, the binder passes through the drying channel with the temperature of 180 ℃ for 2min, the moisture is dried, and then, the coating is solidified through the drying channel with the temperature of 220 ℃.
(III) advantageous effects
The invention discloses a long-tail ticket-holder color electrophoretic paint treatment process, which has the following advantages:
1. the binder is ground by the fine sand in the step 1, foreign matters and rust are removed, a large number of binder can be processed simultaneously, the binder is ground uniformly and is not easy to damage, and in addition, the fine sand can be recycled, so that the binder is green and environment-friendly.
2. Through the cavitation jet-flow injection sodium hydroxide solution in step 1, when getting rid of the fine sand, can make the greasy dirt on long tail ticket holder surface take place saponification, conveniently get rid of the greasy dirt, polish through the fine sand and use with the cooperation of cavitation jet-flow degreasing, can prevent that the foreign matter on long tail ticket holder surface from polluting subsequent acid solution, promote acid solution's result of use.
3. And (3) removing oil stains in the step (1), then carrying out acid washing, and neutralizing the sodium hydroxide solution attached to the surface of the long-tail ticket holder while removing the residual rust.
4. The unqualified products processed in the step 1 can be taken out in time through the step 4, and waste of subsequent processing materials is prevented.
5. The dried binder clips are cooled to the temperature of the electrophoretic liquid in the step 6 and then subjected to electrophoretic treatment, so that the temperature of the electrophoretic liquid is prevented from being influenced when a large number of binder clips are subjected to electrophoresis, and the function of conveniently controlling the temperature of the electrophoretic liquid is achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a flow chart of an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments.
All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the long-tailed ticket-holder color electrophoretic paint treatment process according to the embodiment of the present invention includes the following steps: step 1, pretreatment: a. arrange the binder of long tail in the cylinder that is equipped with the fine sand, the friction of fine sand and binder of long tail when rotating through the cylinder is polished the binder of long tail, gets rid of surface adhesion foreign matter and rust, can polish a large amount of binders of long tail simultaneously, improves machining efficiency, and after polishing the completion, can retrieve reuse, green prevents the follow-up solution of binder of long tail surface adhesion's foreign matter pollution simultaneously to the fine sand.
b. The long tail ticket holder after being polished is placed in a collecting device with a filter screen and is conveyed through the conveyor belt, fine sand and oil stains attached to the surface of the long tail ticket holder are removed through a cavity jet nozzle right above the conveyor belt, the cavitation jet is sprayed with a sodium hydroxide solution, the concentration of the sodium hydroxide solution is 5% -8%, the cavitation jet provides certain impact force for the long tail ticket holder, the fine sand attached to the surface of the long tail ticket holder is convenient to remove, meanwhile, the surface of the long tail ticket holder is not prone to damage, saponification reaction is carried out on the sodium hydroxide solution and the oil stains, and the oil stains are convenient to remove.
c. And immersing the collecting device with the long-tail ticket holder into an acid solution, stirring simultaneously, further removing rust on the surface of the long-tail ticket holder, wherein the pH value of the acid solution is 4 +/-0.2, the immersion time is 1-2 min, and simultaneously neutralizing the sodium hydroxide solution attached to the surface of the long-tail ticket holder.
Step 2, removing acid liquor: and performing cavitation jet spraying twice to remove residual acid liquor on the surface of the long tail ticket holder, wherein deionized water is sprayed out of the cavitation jet twice, so that fine impurities on the surface of the long tail ticket holder are removed while the acid liquor is removed, and the long tail ticket holder is convenient to perform subsequent processing.
And step 3, drying: the binder collecting device sprays hot air to the binder through the drying channel to remove moisture on the surface of the binder, the temperature in the drying channel is 80-90 ℃, and the hot air can guide the moisture while accelerating the evaporation of the moisture on the surface of the binder and keep the drying in the drying channel dry.
Step 4, sorting: and (3) sorting out the long tail ticket holder with the surface adhered with the stains or rusts, repeating the step (1), the step (2) and the step (3), timely taking out unqualified products, and re-processing the products, and meanwhile, preventing the waste of subsequent processing materials.
And step 5, phosphorization: the sorted long-tail ticket clamp is fixed on a hanging tool and is conveyed to be immersed in phosphate solution, a phosphating film is formed on the surface of the long-tail ticket clamp, the free acid is 0.8-1.0 point, the total acid is 18-20 points, the phosphating time is 30-60 s, and the phosphating film can improve the anti-corrosion capability of the long-tail ticket clamp and can improve the adhesive force of the subsequent electrophoretic paint surface.
Step 6, drying and preheating: the phosphatized binder passes through a drying channel, the moisture on the surface of the binder is dried, the binder is kept stand and cooled to the temperature of the electrophoretic liquid, the temperature in the drying channel is 120 ℃, the binder is preheated, the temperature of the electrophoretic liquid is prevented from being influenced when a large number of binders are subjected to electrophoresis, the temperature of the electrophoretic liquid is convenient to control, and the energy is saved.
And 7, electrophoresis: and (3) immersing the long-tail ticket holder into the electrophoresis tank and conveying the long-tail ticket holder under the fixation of a hanger, wherein the conveying direction of the long-tail ticket holder is opposite to the circulating flow direction of the liquid in the electrophoresis tank, a painted surface is formed on the surface of the long-tail ticket holder, the temperature of the electrophoresis liquid is 25-30 ℃, the electrophoresis time is 2-3 min, the flowing concentration of the electrophoresis liquid is kept balanced, and the conveying direction of the long-tail ticket holder is opposite to the flowing direction of the electrophoresis liquid, so that the adhesion of the painted surface is accelerated.
Step 8, cleaning: d. carrying out UF1 and UF2 spray rinsing on the long tail ticket holder; e. then, carrying out two times of pure water cleaning on the long tail ticket holder, and matching with stirring the long tail ticket holder in the cleaning process;
step 9, curing the coating: the binder passes through a drying channel, moisture on the surface of the binder is dried, and paint on the surface of the binder is solidified, the solidification process is divided into two steps, firstly, the binder passes through the drying channel with the temperature of 180 ℃ for 2min, the moisture is dried, then, the binder is solidified through the drying channel with the temperature of 220 ℃, the moisture is dried firstly, the paint is solidified, and the smoothness of the paint surface is ensured.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (1)
1. A long-tail ticket-holder color electrophoretic paint treatment process comprises the following steps: step 1, pretreatment: a. the long-tail ticket holder is placed in a roller filled with fine sand, and the fine sand and the long-tail ticket holder rub when the roller rotates, so that the long-tail ticket holder is polished to remove foreign matters and iron rust attached to the surface; b. placing the polished long tail ticket clip in a collecting device with a filter screen and conveying the long tail ticket clip through a conveyor belt, and removing fine sand and oil stains attached to the surface of the long tail ticket clip by using a cavity jet nozzle right above the conveyor belt, wherein the cavitation jet is sprayed by sodium hydroxide solution; c. immersing the collecting device with the binder of the long tail into an acid solution to further remove rust on the surface of the binder of the long tail;
step 2, removing acid liquor: carrying out cavitation jet spraying twice to remove residual acid liquor on the surface of the long-tail ticket holder, wherein deionized water is sprayed out by the cavitation jet spraying twice;
and step 3, drying: the long tail ticket clip collecting device sprays hot air to the long tail ticket clip through the drying channel to remove the moisture on the surface of the long tail ticket clip;
step 4, sorting: picking out the long tail ticket holder with the surface attached with the stains or rusts, and repeating the steps 1, 2 and 3;
and step 5, phosphorization: fixing the sorted long tail ticket clamp on a hanger, conveying and immersing the long tail ticket clamp into phosphate solution, and forming a phosphating film on the surface of the long tail ticket clamp;
step 6, drying and preheating: passing the phosphatized long-tail ticket holder through a drying channel, drying the moisture on the surface of the long-tail ticket holder, standing and cooling to the temperature of the electrophoretic liquid;
and 7, electrophoresis: under the fixation of a hanger, a long-tail ticket holder is immersed into an electrophoresis tank and is conveyed, wherein the conveying direction of the long-tail ticket holder is opposite to the circulating flow direction of liquid in the electrophoresis tank, and a painted surface is formed on the surface of the long-tail ticket holder;
step 8, cleaning: d. carrying out UF1 and UF2 spray rinsing on the long tail ticket holder; e. then, carrying out two times of pure water cleaning on the long-tail ticket folder; the long tail ticket holder is matched and stirred in the cleaning process;
step 9, curing the coating: and (4) the binder of the long tail passes through the drying channel, and the moisture on the surface of the binder of the long tail is dried and the coating on the surface of the binder of the long tail is solidified.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110798472.6A CN113445104A (en) | 2021-07-15 | 2021-07-15 | Long-tail ticket folder color electrophoretic paint treatment process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110798472.6A CN113445104A (en) | 2021-07-15 | 2021-07-15 | Long-tail ticket folder color electrophoretic paint treatment process |
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| Publication Number | Publication Date |
|---|---|
| CN113445104A true CN113445104A (en) | 2021-09-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110798472.6A Pending CN113445104A (en) | 2021-07-15 | 2021-07-15 | Long-tail ticket folder color electrophoretic paint treatment process |
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| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114505211A (en) * | 2022-01-14 | 2022-05-17 | 宁波沣发新材料有限公司 | Long-tail ticket holder surface coating process |
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| CN114505211A (en) * | 2022-01-14 | 2022-05-17 | 宁波沣发新材料有限公司 | Long-tail ticket holder surface coating process |
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