CN111822309A - Two-piece can and processing method thereof - Google Patents
Two-piece can and processing method thereof Download PDFInfo
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- CN111822309A CN111822309A CN201910326938.5A CN201910326938A CN111822309A CN 111822309 A CN111822309 A CN 111822309A CN 201910326938 A CN201910326938 A CN 201910326938A CN 111822309 A CN111822309 A CN 111822309A
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Classifications
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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
- B05D7/22—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 to internal surfaces, e.g. of tubes
- B05D7/227—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 to internal surfaces, e.g. of tubes of containers, cans or the like
-
- 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
- B05D3/0209—Multistage baking
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
- B65D1/10—Jars, e.g. for preserving foodstuffs
-
- 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
- B05D2504/00—Epoxy polymers
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention provides a two-piece can and a processing method thereof, wherein the processing method comprises the following steps: coating spraying is carried out on the inner walls of the two tank bodies in the autorotation state by adopting a first spray gun and a second spray gun at the same time, the coating spraying time is 110-150ms, the spraying flow of the first spray gun and the second spray gun is 0.094-0.103GPM, and the nozzle aperture is 0.0134 inch; different areas have the same coating material spraying amount in the nozzle width direction of the first spray gun; in the width direction of the nozzle of the second spray gun, different areas have different coating spraying amounts, and the coating spraying amount of the middle area is larger than that of the two end areas. The two-piece tank has a uniform and compact inner film layer attached to the inner wall, so that the two-piece tank has extremely strong corrosion resistance.
Description
Technical Field
The invention relates to a two-piece can and a processing method thereof, belonging to the technical field of metal container manufacturing.
Background
Since the 20 th century 60 th American world appeared, aluminum two-piece pop cans were widely used in the carbonated beverage and beer industries due to their light weight, thin wall, high strength, light resistance, oxidation resistance, long shelf life, environmental friendliness, attractive appearance, easy refrigeration, convenient storage by consumers and ready use, and the protective layer coated inside the two-piece can bodies to ensure fresh and fresh mouthfeel, freshness, quality and flavor of the filled beverage. Meanwhile, with the national emphasis on environmental protection and food safety, because the aluminum two-piece can uses the environmental protection advantage of water-based paint coating and the production cost advantage, and with the continuous innovation and development of the spraying technology and the filling technology, many well-known brands are trying to convert the traditional tinplate three-piece can package into the aluminum two-piece can package, and the aluminum two-piece pop can has slowly permeated into more and more beverage fine classification products such as protein beverage, functional beverage and the like.
When liquid filling is performed by using two-piece cans, low-temperature filling and high-temperature filling are divided according to different canned objects, namely, liquid filling is performed at low temperature (2-4 ℃) and liquid filling is performed at high temperature (85-95 ℃), wherein carbonated beverages and beer need to be filled at low temperature, and functional beverages and protein beverages need to be sterilized at high temperature and filled at high temperature due to excessive nutrient media. The filling and storage of the beverage need to meet the food sanitation and safety regulations, so the inner wall of the used tank body is coated with a corresponding protective layer, the adhesion degree and the uniformity of the inner wall protective layer, especially the adhesion degree of the protective layer at the concave part at the bottom of the two-piece tank body reach the standard, and the production difficulty of the two-piece tank is the difficulty. In actual production, although the liquid filled at low temperature has a certain corrosion resistance, the liquid filled at high temperature often suffers from liquid deterioration and even liquid extravasation due to high temperature and high content of nutrient medium, because the properties of the inner wall protection layer, such as uniformity and adhesion, are difficult to ensure, so that the contents directly act on the tank body, and the contents are polluted and the tank body is corroded. Therefore, the technical problem to be solved by those skilled in the art is how to improve the performance of the inner wall protection layer of the tank body and enhance the corrosion resistance of the two-piece tank.
Disclosure of Invention
The invention provides a two-piece tank body, wherein the inner walls of the two-piece tank body are coated with a complete and uniform inner film layer, the inner film layer can effectively improve the corrosion resistance of the two-piece tank body, and the two-piece tank body can be applied to filling of high-temperature liquid.
The invention also provides a processing method of the two-piece tank body, which controls parameters of a coating spraying process, and can enable the coating to form a compact and uniform inner film layer on the inner wall of the two-piece tank body, thereby improving the corrosion resistance of the two-piece tank body.
The invention provides a processing method of a two-piece tank body, which comprises the following steps:
coating spraying is carried out on the inner walls of the two tank bodies in the autorotation state by adopting a first spray gun and a second spray gun at the same time, the coating spraying time is 110-150ms, the spraying flow of the first spray gun and the second spray gun is 0.094-0.103GPM, and the nozzle aperture is 0.0134 inch;
different areas have the same coating material spraying amount in the nozzle width direction of the first spray gun;
in the width direction of the nozzle of the second spray gun, different areas have different coating spraying amounts, and the coating spraying amount of the middle area is larger than that of the two end areas.
The method of processing a two-piece can as described above, wherein the amount of spray in the first region is 30% and the amount of spray in the second region is 70% in the nozzle width direction of the second spray gun; the first area is an area from the position with the highest spraying amount to the first end of the second spray gun in the width direction, and the second area is an area from the position with the highest spraying amount to the second end of the second spray gun in the width direction.
The processing method of the two-piece tank comprises the following steps that an included angle between the first spray gun and the central axis of the two-piece tank body is 6-12 degrees, and an included angle between the second spray gun and the central axis of the two-piece tank body is 14-23 degrees;
the first spray gun and the second spray gun are positioned on the same side of the central axes of the two tank bodies.
The method for processing the two-piece can comprises the step of spraying the first spray gun and the second spray gun at a spray pressure of 600 +/-50 psi.
The processing method of the two-piece can is characterized in that the linear distance between the nozzle of the first spray gun and the plane where the openings of the two-piece can body are located is 15-30mm,
the linear distance between the nozzle of the second spray gun and the plane where the openings of the two tank bodies are located is 20-40 mm.
The method for processing a two-piece can as described above, wherein the coating is a water-based epoxy coating.
The method for processing the two-piece can, wherein the temperature of the coating is 32-38 ℃.
The processing method of the two-piece can comprises the steps of sequentially carrying out first drying treatment, second drying treatment and third drying treatment on the two-piece can body sprayed with the coating;
wherein the temperature of the first drying process is lower than the temperature of the second drying process, and the temperature of the second drying process is lower than the temperature of the third drying process.
The processing method of the two-piece can comprises the steps of drying the first can at 90-110 ℃ for 65-145 s;
the temperature of the second drying treatment is 145-165 ℃, and the time is 65-145 s;
the temperature of the third drying treatment is 205-225 ℃, and the time is 65-145 s.
The invention also provides a two-piece can obtained by the processing method.
The two-piece can inner wall can form a protective film layer which is completely coated, uniform in thickness and excellent in bonding degree with the can wall, the protective film layer can isolate liquid and a metal wall, and has strong corrosion resistance to acidic liquid and high-temperature liquid, so that the two-piece can inner wall is suitable for low-temperature filling of carbonated beverage and beer, is more suitable for high-temperature filling of functional beverage and protein beverage, and is suitable for great application and popularization in the beverage packaging industry.
According to the processing method of the two-piece tank, the coating uniformity, the coating integrity and the compactness of the inner film layer and the combination degree of the inner film layer and the tank wall can be obviously improved by controlling the spraying process of the inner film layer of the tank body, so that the corrosion resistance level of the inner film layer to high-temperature liquid and acidic liquid is effectively improved, and the processing method is simple and is suitable for popularization in the industry.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. 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.
The invention provides a processing method of a two-piece can, which comprises the following steps:
coating spraying is carried out on the interiors of the two tank bodies in the autorotation state by adopting a first spray gun and a second spray gun at the same time, the coating spraying time is 110-150ms, the spraying flow of the first spray gun and the second spray gun is 0.094-0.103GPM, and the nozzle aperture is 0.0134 inch;
different areas have the same coating material spraying amount in the nozzle width direction of the first spray gun;
in the width direction of the nozzle of the second spray gun, different areas have different coating spraying amounts, and the coating spraying amount of the middle area is larger than that of the two end areas.
GPM refers to gallons per minute.
The two can bodies are obtained by punching and drawing the metal base plate, and the side walls and the bottom wall of each can body are of an integral structure and are seamless, so that the can is better in airtightness and suitable for packaging liquid. The metal substrate is an aluminum substrate, and the thickness of the aluminum substrate can be 0.250-0.270 mm.
The interior of the two-piece can body can then be sprayed with paint.
During specific spraying, the two tank bodies are horizontally placed on a spraying platform (namely, the height direction of the two tank bodies is parallel to the horizontal plane) so that the two tank bodies rotate. The nozzles of the first spray gun and the second spray gun are respectively positioned outside the tank body and face the interior of the tank body, and when the first spray nozzle and the second spray nozzle spray the coating to the interior of the tank body, the coating from the first spray nozzle and the second spray nozzle can be gradually distributed on the inner walls of the two tank bodies along with the rotation of the two tank bodies.
The inventor researches the structure of the spray gun, and finds that after the first spray gun and the second spray gun with the spraying characteristics are combined, a larger area can be covered in unit time, so that the spraying efficiency can be improved, the effective utilization rate of the coating is improved, the coating coverage maximization of the inner walls of the two tanks can be ensured, and the protection area of the film layer on the inner walls of the two tanks can be effectively increased after the coating is formed.
Specifically, the nozzle width direction of the first spray gun and the second spray gun refers to a direction perpendicular to a direction in which the coating material is ejected outward. Wherein the amount of the coating material is the same at each position along the width direction of the nozzle on the coating material beam sprayed by the first spray gun; the amount of coating material varies from place to place along the nozzle width direction on the coating material beam ejected from the second spray gun, and the smaller the amount of coating material at the areas closer to the two ends of the coating material beam, the larger the amount of coating material at the area closer to the middle of the coating material beam. It will be appreciated that the spray characteristics of the spray gun described above are related to the composition of the internal structure of the nozzle.
On the basis of the above, the invention also defines the flow rate and the nozzle aperture of the first spray gun, the flow rate and the nozzle aperture of the second spray gun, and the spraying time.
When the flow of the first spray gun is 0.094-0.103GPM, the aperture of the nozzle is 0.0134 inch, the flow of the second spray gun is 0.094-0.103GPM, and the aperture of the nozzle is 0.0134 inch, the coating sprayed on the inner walls of the two tanks at the flow of the nozzle can be sufficiently leveled and diffused under certain pressure along with the autorotation of the two tanks, when the spraying time is 110 plus 150ms, the coating can be ensured to be adhered to each corner (plane, convex part and concave part) of the inner walls of the two tanks with certain thickness, and after the coating is dried into a protective film layer, the protective film layer can comprehensively protect the inner walls of the two tanks, even the concave part of the inner walls of the tanks can be completely protected, so that the phenomenon that the tank body is likely to leak is avoided, and the corrosion resistance of the two tanks is further improved. And the protective film layer has a certain thickness, so that the protective film layer is suitable for canning of high-temperature liquid, can resist the corrosive force of the high-temperature liquid to a certain degree, avoids the possibility of direct contact between the liquid and metal on the tank wall, and avoids the phenomena of deterioration and even liquid seepage.
Further, when the spraying amount of the first region is 30% and the spraying amount of the second region is 70% in the nozzle width direction of the second spray gun, the coating uniformity of the coating material on the bottom recess of the can be further increased. The first area is an area from the position with the highest spraying amount to the first end of the second spray gun along the width direction, and the second area is an area from the position with the highest spraying amount to the second end of the second spray gun along the width direction.
The first and second lances having the above parameters are commercially available in general, and the present invention is not limited to specific manufacturers of the first and second lances. For example,
the first spray gun may be Nordson Dome Nozzle 122000; the second spray gun may be Nordson domeonozle 122335.
According to the invention, the structure of the spray gun, the flow rate of the spray gun and the time of the spray gun for spraying the coating on the two tank bodies are limited, so that the integrity of the coating attached to the inner walls of the two tank bodies can be effectively ensured, and the phenomenon that the two tank bodies are corroded due to the fact that the coating is not covered is avoided.
Furthermore, the included angle between the first spray gun and the central axis of the two tank bodies is 6-12 degrees, and the included angle between the second spray gun and the central axis of the two tank bodies is 14-23 degrees;
the first spray gun and the second spray gun are positioned on the same side of the central axes of the two tank bodies.
The included angle is an included angle between a central axis of the spray gun body of the spray nozzle and central axes of the two tank bodies in the height direction.
By setting the included angles between the first spray gun and the second spray gun and the two tank bodies respectively, the uniformity of the distribution of the coating inside the two tank bodies can be further ensured, the uniformity of the coating can be further realized on the basis of carrying out full coverage on the inner walls of the two tank bodies, and the uniformity of the coating at each position of the inner walls of the two tank bodies is ensured, namely, after the coating is dried into a protective film, the thickness of the protective film at each position of the inner walls of the two tank bodies is basically consistent, so that the balanced protection of the inner walls of the two tank bodies is further realized, the inner walls of the two tank bodies all have equivalent corrosion resistance, and the weak point of corrosion resistance can not occur.
In the present invention, in order to further enhance the corrosion resistance of the two-piece can, the inner wall of the can body may be sprayed with an aqueous epoxy resin coating.
For example, Valspa 4020 WM may be used.
In addition, the invention also limits the coating temperature so as to improve the corrosion resistance of the two-piece can body.
Specifically, the inventor finds that when the temperature of the coating is 32-38 ℃, the adhesion performance of the coating on the inner walls of the two tanks can be effectively enhanced on the premise of not influencing the film forming performance of the coating, so that the tightness between the coating and the inner walls of the two tanks is enhanced, and after the coating is dried to form a film layer, the film layer can be uniformly and tightly adhered to the inner walls of the tanks, so that the corrosion resistance of the two tanks is further optimized.
Further, the spray pressure of the first spray gun and the second spray gun is 600 ± 50psi, wherein the pressure of the first spray gun and the second spray gun can be the same or different.
The result shows that the coating pressure is utilized to spray the inner walls of the two tanks, the leveling property of the coating on the inner walls can be further improved, and the coating can flow along the tank walls under the action of inertia after being contacted with the inner walls of the two tanks under certain pressure, so that the coating is favorably and uniformly and smoothly attached to the inner walls of the tanks, and the protection force of the coating on the inner walls of the tanks after being dried into a protection film is further enhanced.
When the spray gun is used for spraying, along with the reduction of the distance between the spray gun and the two tank bodies, the coating area of the coating of unit volume on the inner wall of the two tank bodies is smaller, but when the distance between the spray gun and the two tank bodies is too large, part of the coating cannot enter the two tank bodies, so that the coating is wasted, even the coating is too dispersed in the two tank bodies, and the spraying range and the spraying area are not easy to control. Thus, the present invention further defines the distance between the first and second lances and the two-piece canister.
Specifically, the linear distance between the nozzle of the first spray gun and the plane where the openings of the two tank bodies are located is 15-30mm,
the linear distance between the nozzle of the second spray gun and the plane where the openings of the two tank bodies are located is 20-40 mm.
In a preferred embodiment, the linear distance between the nozzle of the first spray gun and the plane of the opening of the two-piece can body is 20mm, and the linear distance between the nozzle of the second spray gun and the plane of the opening of the two-piece can body is 25 mm.
By using the processing method of the two-piece tank, the coating can be sprayed on the inner walls of the two-piece tank bodies with the models of 204-type 330 and 211-type 250, the quality of the protective film layers on the inner walls of the two-piece tank with the model of 204-type 330 is larger than 140mg and smaller than or equal to 165mg, the uniformity of the protective layer is 3.0-6.5 g/square meter, the quality of the protective film layers on the inner walls of the two-piece tank with the model of 211-type 250 is larger than 140mg and smaller than or equal to 165mg, the uniformity of the protective layer is 3.0-6.5 g/square meter, all corners of the inner walls of the two-piece tank can be comprehensively protected, and the improvement of the anti-corrosion performance of the two-piece tank can be realized by optimizing the uniformity and the thickness of the protective film layers.
Wherein, the 204-330 pot type refers to an aluminum two-piece pot with an outer diameter of about 57.50mm and a volume of 330ml, and the 211-250 pot type refers to an aluminum two-piece pot with an outer diameter of about 66.24mm and a volume of 250 ml.
After the two tank bodies are sprayed with the paint, the tank bodies need to be dried so that the paint forms a protective film layer with a protective function on the inner walls of the tank bodies.
On the basis of the above embodiment, the present invention also performs parameter limitation on the drying process.
Specifically, the two tank bodies with the inner film layer are sequentially subjected to first drying treatment, second drying treatment and third drying treatment; wherein the temperature of the first drying process is lower than the temperature of the second drying process, and the temperature of the second drying process is lower than the temperature of the third drying process.
By limiting the drying treatment to a three-section stage heating mode, the coating can be uniformly dried from outside to inside to form a film, and the possibility of generating bubbles in the coating in the drying process can be reduced, so that the compactness of the coating after film formation is optimized, and the corrosion resistance of the two tanks is improved.
In the specific operation, the mesh belt dryer can be used for drying, the temperatures of the first zone, the second zone and the third zone of the mesh belt dryer are respectively set according to the first drying temperature, the second drying temperature and the third drying temperature, and the temperature and the time of the first drying treatment and the temperatures and the times of the second drying treatment and the third drying treatment are realized by adjusting the running speed of the drying mesh belt.
In concrete drying process, can also set up convulsions between second drying process and third drying process and handle in order to improve the volatilization of solvent, can produce a large amount of volatile gas after first stoving, second drying, help gas outgoing through convulsions to further reduce the possibility that the film forming in-process produced the bubble. This air draft treatment can be realized through setting up exhaust device in two districts and three districts.
In one embodiment, the temperature of the first drying treatment is 90-110 ℃ and the time is 65-145 s; the temperature of the second drying treatment is 145-165 ℃, and the time is 65-145 s; the temperature of the third drying treatment is 205-225 ℃, and the time is 65-145 s.
In addition, when a cup is punched on a metal substrate using a punching die, in order to make the punching die easily separated from a can body, a squaring process and a lubricating oil coating process are generally performed on the surface of the punching die, wherein the squaring process means that small squares are scribed on the surface of the punching die, so that air can enter between the punching die and the can body during punching, and the separation of the punching die is facilitated. Therefore, after the cup punching die is separated from the tank body, oil stains and metal powder are attached to the surface of the inner wall of the tank body, and the surface of the inner wall of the tank body also has stretching textures. In the prior art, paint is sprayed after the inner wall of the tank body is simply cleaned by using a common cleaning agent, but the cleaning treatment is further limited in order to increase the adhesive force between the paint and the inner wall of the tank body.
Before the paint is sprayed on the two tank bodies, the two tank bodies are cleaned, and the cleaning agent comprises hydrofluoric acid and sulfuric acid. After the cleaning process is completed, the cleaning agent is removed by rinsing it with water, such as deionized water. And finally, drying the tank body to dry the moisture on the surface of the tank body, so that the coating spraying treatment can be carried out. The drying method is not particularly limited in the present invention.
In the cleaning process, the tank body is washed and cleaned by the acidic cleaning agent, and the attachments on the tank body can be cleaned in a targeted and efficient manner, so that the cleanliness of the tank body is ensured, the adhesive force of the coating on the inner wall of the tank body can be effectively improved, the coating is tightly attached to the inner wall of the tank body, and after the coating is dried to form a film layer, the film layer cannot fall off from the inner wall of the tank body, so that the inner wall of the tank body can be protected in an efficient manner, and the corrosion resistance of the two tanks is increased.
Furthermore, when the temperature of the cleaning agent is 50-62 ℃, the cleaning effect can be optimized, and the cleaning efficiency of the tank body is improved.
After the two tank bodies are treated, the tank bodies and the tank covers can be hermetically connected through a seaming process.
The processing method of the present invention will be described below with reference to specific examples.
Example 1
The processing method of the two-piece can of the embodiment comprises the following steps:
1) performing cup punching and stretching on the aluminum substrate to obtain two tank bodies with the models of 204 and 330;
2) cleaning, deoiling and drying the two formed tank bodies to dry the moisture on the surfaces of the tank bodies;
3) paint spraying
Horizontally placing the two tank bodies on a spraying platform for autorotation, wherein nozzles of a first spray gun and a second spray gun are respectively positioned outside the tank bodies and spray paint towards the interior of the tank bodies, the paint is Valspa 4020 WM, and the paint temperature is 35 ℃;
wherein different areas have the same coating material spraying amount in the nozzle width direction of the first spray gun; in the width direction of the nozzle of the second spray gun, different areas have different coating spraying amounts, and the coating spraying amount of the middle area is larger than that of the two end areas, specifically, the spraying amount of the first area is 30%, the spraying amount of the second area is 70%, the first area is an area from the highest point of the spraying amount to the first end of the second spray gun in the width direction, and the second area is an area from the highest point of the spraying amount to the second end of the second spray gun in the width direction.
The flow of the first spray gun is 0.098GPM, the aperture of the spray nozzle is 0.0134 inch, the included angle between the first spray gun and the central axes of the two tank bodies is 9 degrees, the spraying pressure of the first spray gun is 600psi, and the linear distance between the spray nozzle of the first spray gun and the plane of the opening of the two tank bodies is 20 mm;
the flow of the second spray gun is 0.098GPM, the aperture of the spray nozzle is 0.0134 inches, the included angle between the second spray gun and the central axes of the two tank bodies is 16 degrees, the second spray gun and the first spray gun are positioned on the same side of the central axes of the tank bodies, the spraying pressure of the second spray gun is 600psi, and the linear distance between the spray nozzle of the second spray gun and the plane where the openings of the two tank bodies are positioned is 30 mm;
the first lance was Nordson Dome Nozzle 122000; the second lance was Nordson Dome Nozzle 122335.
4) Drying by baking
Performing three-stage heating and drying treatment by using a mesh belt dryer, wherein the temperature of a first zone is 105 ℃, and the time is 105 s; the temperature of the second zone is 150 ℃ and the time is 105 s; the temperature in the third zone was 210 ℃ and the time was 105 s.
Two-piece can # 1 of this example was obtained.
Example 2
The processing method of the two-piece can of the embodiment comprises the following steps:
1) the aluminum substrate is subjected to cup punching and stretching to obtain two tanks with the models of 211 and 250;
2) cleaning, deoiling and drying the two formed tank bodies to dry the moisture on the surfaces of the tank bodies;
3) paint spraying
Horizontally placing the two tank bodies on a spraying platform for autorotation, wherein nozzles of a first spray gun and a second spray gun are respectively positioned outside the tank bodies and spray paint towards the interior of the tank bodies, the paint is Valspa 4020 WM, and the paint temperature is 35 ℃;
wherein different areas have the same coating material spraying amount in the nozzle width direction of the first spray gun; in the width direction of the nozzle of the second spray gun, different areas have different coating spraying amounts, and the coating spraying amount of the middle area is larger than that of the two end areas, specifically, the spraying amount of the first area is 30%, the spraying amount of the second area is 70%, the first area is an area from the highest point of the spraying amount to the first end of the second spray gun in the width direction, and the second area is an area from the highest point of the spraying amount to the second end of the second spray gun in the width direction.
The flow of the first spray gun is 0.098GPM, the aperture of the spray nozzle is 0.0134 inch, the included angle between the first spray gun and the central axes of the two tank bodies is 8 degrees, the spraying pressure of the first spray gun is 600psi, and the linear distance between the spray nozzle of the first spray gun and the plane of the opening of the two tank bodies is 20 mm;
the flow of the second spray gun is 0.098GPM, the aperture of the spray nozzle is 0.0134 inches, the included angle between the second spray gun and the central axes of the two tank bodies is 16 degrees, the second spray gun and the first spray gun are positioned on the same side of the central axes of the tank bodies, the spraying pressure of the second spray gun is 600psi, and the linear distance between the spray nozzle of the second spray gun and the plane where the openings of the two tank bodies are positioned is 25 mm;
the first lance was Nordson Dome Nozzle 122000; the second lance was Nordson Dome Nozzle 122335.
4) Drying by baking
Carrying out three-stage heating and drying treatment by using a mesh belt dryer, wherein the temperature of a first zone is 100 ℃ and the time is 85 s; the temperature of the second zone is 150 ℃ and the time is 85 s; the temperature in the three zones was 210 ℃ and the time was 85 s.
Two-piece can # 2 of this example was obtained.
Example 3
The processing method of the two-piece can in the embodiment is basically the same as the method in the embodiment 1, and the difference is that only secondary drying is adopted in the drying in the step 4), the drying temperature in the first area is 100 ℃, and the drying time is 210 s; the drying temperature in the second zone is 205 ℃ and the drying time is 105 s.
Two-piece can # 3 of this example was obtained.
Comparative example 1
The method of processing the two-piece can of this comparative example was substantially the same as that of example 1, except that in step 3), different regions in the nozzle width direction of the first spray gun and the second spray gun had the same paint application amount.
The flow rate of the first spray gun is 0.098GPM, the aperture of the spray nozzle is 0.0134 inch, the included angle between the first spray gun and the central axes of the two tank bodies is 9 degrees, the spraying pressure of the first spray gun is 600psi, and the linear distance between the spray nozzle of the first spray gun and the plane of the opening of the two tank bodies is 20 mm;
the flow of the second spray gun is 0.044GPM, the aperture of the spray nozzle is 0.0089 inch, the included angle between the second spray gun and the central axes of the two tank bodies is 16 degrees, the second spray gun and the first spray gun are positioned at the same side of the central axes of the tank bodies, the spraying pressure of the second spray gun is 600psi, and the linear distance between the spray nozzle of the second spray gun and the plane of the opening of the two tank bodies is 30 mm.
Two-piece can 4# of this comparative example was obtained.
The two-piece cans in the above examples and comparative examples were tested, including the distribution of the protective film layer, the quality of the protective film layer, and the adhesion of the protective film layer.
1. Distribution of protective film
A Sencon SI9600 distribution instrument is adopted, two tank bodies to be detected are taken, an electric crocodile mouth clamp is clamped at the tank opening of a measuring tank, and the electric crocodile mouth clamp is moved slightly to ensure that the electric clamp cuts a coating. The uniformity of 3 points (the mass of the protective film layer per square meter) is respectively measured from outside to inside according to the division points or marks of the metal rings, and then 3 points are measured every 120 degrees of rotation. And after finishing measuring 9 points of internal coating distribution, removing the pot, cutting the pot by using scissors, and measuring the uniformity of one point at the center of the pot bottom.
For each example, 5 two-piece cans were taken for measurement, each of which had 10 measurements, and the measurements are shown in Table 1.
TABLE 1
As can be seen from Table 1:
1. as is clear from comparison of examples 1 to 3 with comparative example 1, the method of the present example is suitable for canning of high-temperature liquids because the uniformity of the protective film layer on the inner wall of the two-piece can is high and the protective film layer is thick.
2. Quality of protective film
In the processing process, weighing and recording the tank body before coating spraying by using an electronic analytical balance; after the processing is finished, weighing and recording the tank body after the coating is dried and formed into a film; and the difference of the two weighing is the mass of the protective film layer. Wherein the tank weight before spraying is recorded as m0And the tank weight after the paint is dried and formed into a film is recorded as m1The weight m of the protective film is m1-m0。
For each example, 5 two-piece cans were taken for measurement and the results are shown in Table 2.
TABLE 2
As can be seen from Table 2:
1. as is clear from comparison of examples 1 to 3 with comparative example 1, the two-piece can obtained by the method of the present example had a large mass of the protective film layer on the inner wall and a thick protective film layer, and thus was suitable for canning of high-temperature liquid.
2. The quality of the protective film layer of example 3 was higher than that of the protective film layer of example 1 because the drying manner of example 3 resulted in partial solvent non-volatilization to result in higher quality, as evidenced by the presence of bubbles in the protective film layer of the 3# can and poor adhesion.
3. Adhesion of protective film
The can body is cut, one half of the sidewall is subtracted, and the entire bottom and one half of the sidewall are retained. The water temperature in the water bath kettle reaches 95 +/-2 ℃. The cut pot is soaked in water at the temperature of 95 +/-2 ℃ for boiling for 30 minutes, then the detection piece is wiped clean by absorbent paper, parallel cross lines are drawn on the pot opening, the pot body, the bottom of the pot body and the center of the pot bottom by blades respectively, the line distance (two line distances) is 1mm, the drawn lines are drawn to penetrate through the film coating degree, the drawn film is brushed off by a writing brush, 3M610 adhesive tapes are pasted on a square grid line, the compression is carried out by translation of the abdomen of a forefinger, 15-20 mm adhesive tapes are kept for holding, one end of a sample piece is pressed by fingers on a desktop, and the adhesive tapes are quickly torn off from the film coating in an oblique upper direction. And checking the torn area of the coating in the grid, wherein the torn area is qualified if the torn area is less than 10 percent, and the torn area is unqualified if the torn area is not more than 10 percent.
Through detection, the adhesive force of No. 1, No. 2 and No. 4 is qualified, the adhesive force of the tank opening and the tank body of No. 3 is qualified, and the adhesive force of the tank bottom and the center of the tank bottom of No. 5 is unqualified.
It can be found by analysis that the reason for the failure of the 3# can is probably that the drying process of example 3 makes it difficult for part of the solvent to volatilize and accumulate in the protective film layer, thereby reducing the adhesion between the protective film layer and the inner wall of the can body.
4. Integrity of the protective film layer
And adding the electrolyte to a position 2 mm away from the tank opening by using a Sencon SI9100 inner film integrity tester, pressing the electrode bar in place, starting timing for 4 seconds by using the tester, and displaying the conductivity after 4 seconds.
For each example, 25 two-piece cans were taken and measured, and the results are shown in Table 3.
TABLE 3
As can be seen from Table 3:
1. as is clear from comparison of examples 1-2 with comparative example 1, the two-piece can obtained by the method of this example has a protective film layer with excellent integrity on the inner wall, and thus is suitable for canning of high-temperature liquids.
2. The integrity of the protective film layer of example 3 is relatively deviated, because the drying manner of example 3 can lead to that part of the solvent can not be volatilized, so that bubbles exist in the protective film layer, and the conductivity is increased.
5. Appearance of protective film
Through visual observation, the protective film layers in the tank bodies of No. 1, No. 2 and No. 4 have no spots and no bubbles; the protective film layer in the 3# tank body has no spots and has fine bubbles.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for processing a two-piece can, comprising the steps of:
coating spraying is carried out on the inner walls of the two tank bodies in the autorotation state by adopting a first spray gun and a second spray gun at the same time, the coating spraying time is 110-150ms, the spraying flow of the first spray gun and the second spray gun is 0.094-0.103GPM, and the nozzle aperture is 0.0134 inch;
different areas have the same coating material spraying amount in the nozzle width direction of the first spray gun;
in the width direction of the nozzle of the second spray gun, different areas have different coating spraying amounts, and the coating spraying amount of the middle area is larger than that of the two end areas.
2. The method of processing a two-piece can according to claim 1, wherein the amount of spray applied to the first region is 30% and the amount of spray applied to the second region is 70% in the nozzle width direction of the second spray gun; the first area is an area from the position with the highest spraying amount to the first end of the second spray gun in the width direction, and the second area is an area from the position with the highest spraying amount to the second end of the second spray gun in the width direction.
3. The processing method of the two-piece can according to claim 2, wherein the included angle between the first spray gun and the central axis of the two-piece can body is 6-12 degrees, and the included angle between the second spray gun and the central axis of the two-piece can body is 14-23 degrees;
the first spray gun and the second spray gun are positioned on the same side of the central axes of the two tank bodies.
4. The method of processing a two-piece can according to claim 3, wherein the spray pressure of the first and second spray guns is 600 ± 50 psi.
5. The method for processing the two-piece can according to claim 4, wherein the linear distance between the nozzle of the first spray gun and the plane of the opening of the two-piece can body is 15-30mm,
the linear distance between the nozzle of the second spray gun and the plane where the openings of the two tank bodies are located is 20-40 mm.
6. The method of processing a two-piece can according to claim 1, wherein the coating is a water-borne epoxy coating.
7. The method of processing a two-piece can according to claim 6, wherein the temperature of the coating is 32-38 ℃.
8. The method for processing the two-piece can according to any one of claims 1 to 7, wherein the two-piece can body sprayed with the paint is sequentially subjected to a first drying treatment, a second drying treatment and a third drying treatment;
wherein the temperature of the first drying process is lower than the temperature of the second drying process, and the temperature of the second drying process is lower than the temperature of the third drying process.
9. The method for processing a two-piece can according to claim 8, wherein the temperature of the first drying treatment is 90-110 ℃ and the time is 65-145 s;
the temperature of the second drying treatment is 145-165 ℃, and the time is 65-145 s;
the temperature of the third drying treatment is 205-225 ℃, and the time is 65-145 s.
10. A two-piece can obtained by the process according to any one of claims 1 to 9.
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Cited By (1)
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| CN113857021A (en) * | 2021-09-30 | 2021-12-31 | 广州市东鹏食品饮料有限公司 | Metal beverage can spraying method and application thereof |
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