Aluminum ring-pull can and machining process thereof

Abstract

The invention provides an aluminum ring-pull can and a machining process thereof, and relates to the technical field of ring-pull can production. The aluminum zip-top can comprises a zip-top can body, a zip-top can cover body, a pull ring and a film covering protection layer, the top of the zip-top can body is fixedly connected with the zip-top can cover body in a sealed mode, the pull ring is riveted to the middle of the upper surface of the zip-top can cover body, and the outer surfaces of the zip-top can body, the zip-top can cover body and the pull ring are jointly sleeved with the film covering protection layer. And a tearable cross-linking part is arranged at the position, corresponding to the pull ring, of the laminating protective layer. By adopting the mode that the surface of the finished ring-pull can is coated with the film, dust can be prevented from being accumulated in gaps of the cover body of the ring-pull can, a user can tear off the film while opening the ring-pull, bacteria and dirt stained on the cover body of the ring-pull can in the transportation and storage process are prevented from being sucked in, the ring-pull can is cleaner and more sanitary in use, and meanwhile, the ring-pull can is more convenient to use. The zip-top can with the characteristic is more suitable for market requirements and easier to popularize.

Description

Technical Field

[0001] The invention relates to the technical field of can production, in particular to an aluminum can and a mechanical processing technology thereof. Background Art

[0002] A can is a lightweight metal container, usually made of aluminum or tinplate. It is mainly used to package beverages and foods, such as carbonated drinks, beer, etc. The design of the can makes it very easy to open, and users can easily open the can lid by simply pulling the ring. The invention of the can can be traced back to 1959, when Ernie C. Fraze (Emar Clinian Fraze) of DRT Company in Deaton, Ohio, USA, invented the can, which is to use the material of the can lid itself to form a rivet, a pull ring is covered and riveted, and a corresponding notch is added to form a complete can lid.

[0003] This invention made a historic breakthrough for metal containers after 50 years of long development. At the same time, it also laid a solid foundation for the development of canning and beverage industries. This invention made a historic breakthrough in metal container technology and quickly became popular in the European and American markets.

[0004] The pull rings on existing cans of various shapes and sizes are all processed and installed on the upper cover of the can. The biggest disadvantage is that it is very unhygienic. Because the circular groove on the upper surface and the circular gap on the edge of the groove are easy to accumulate dust, it is not easy to clean. In the hot summer, a large number of thirsty people will at most wipe it with dirty fingers or outer clothes, open the pull ring and put it in their mouths;

[0005] What's more, the push-in design is unhygienic. The mouth of the can is exposed to the outside air for a long time, and it is inevitably contaminated with bacteria and dirt during storage and transportation. The push-in design makes it easier for dirt from the bottle mouth to be brought into the drink. The bacteria in the dust on the can will naturally enter the human body along with the drink or food sucked into the mouth.

[0006] Therefore, we proposed a new aluminum can and its machining process. Summary of the invention

[0007] 1. Technical issues to be resolved

[0008] In view of the deficiencies in the prior art, the present invention provides an aluminum can and a mechanical processing technology thereof, which solves the problem that the existing push-in design of various shapes and sizes of cans in the prior art is unhygienic, the mouth of the can is exposed to the outside air for a long time, and it is inevitable to be contaminated with bacteria and dirt during storage and transportation, and the push-in design makes it easier for dirt at the bottle mouth to be brought into the beverage, and the bacteria in the dust on the can naturally enter the human body along with the beverage or food sucked into the mouth.

[0009] (II) Technical solution

[0010] To achieve the above objectives, the present invention is implemented through the following technical scheme: an aluminum can, comprising a can body, a can cover, a pull ring and a coating protective layer, the top of the can body is sealed and fixedly connected to the can cover, the pull ring is riveted to the middle of the upper surface of the can cover, and the outer surfaces of the can body, the can cover and the pull ring are jointly covered with a coating protective layer, and the coating protective layer is provided with a tearable cross-link at the position of the pull ring corresponding to the position of the pull ring.

[0011] A mechanical processing technology for aluminum cans includes the following specific steps:

[0012] Step 1: Production of can body: First, the aluminum raw material is punched into a 0.3mm thick round aluminum sheet using a large punching machine, and then the round aluminum sheet is pulled into a thin-walled cup using a cup punching machine and a drawing machine, and the bottom of the cup is punched into a concave arch shape. Subsequently, the top of the thin-walled cup is necked to form a can mouth;

[0013] Step 2, production of can lid: the aluminum raw material is punched and stretched into a lid blank by a punching machine, and then the lid blank is curled by a curling machine, and a sealing hook edge is rolled out to form a basic lid, and a sealant is applied on the lid groove, dried, and cured, and then the basic lid is subjected to the steps of blister formation, rivet buckle formation, notching, riveting, and lettering to form a finished lid;

[0014] Step 3: Assembling the can body and the cover body: rolling the top opening of the can body and the edge of the finished cover together to form an airtight cavity for sealing, thereby forming a finished can to be packaged;

[0015] Step 4, coating: coating the outer surface of the finished can, the film protection layer is divided into two parts: a protective layer body and a tearing part, the protective layer body is sleeved and attached to the main part of the can body and the cover body, the tearing part is attached to the upper surface of the pull ring, and the protective layer body and the tearing part are segmented and multi-point cross-linked.

[0016] Preferably, a method for laminating finished cans to be packaged is provided: a layer of safety film is applied to the finished cans to be packaged by using hot air blowing, and the safety film is attached to the upper surface to form a heat shrinkable film similar to a reverse blow molding process, and the finished cans to be packaged are wrapped.

[0017] Preferably, a method for coating finished cans to be packaged is provided: a layer of food-grade gel coat is sprayed on the surface of the finished cans to be packaged by a masking spraying method, and then the torn opening of the cans is point pressed at the same time, thereby achieving cross-linking of the film protective layer.

[0018] Preferably, a method for coating finished cans to be packaged is provided: using a mold compatible with the cans to be packaged, and using the mold to press the plastic film to adhere to the surface of the cans to be packaged.

[0019] (III) Beneficial effects

[0020] The present invention provides an aluminum can and a mechanical processing technology thereof, which has the following beneficial effects:

[0021] 1. This type of aluminum can and its machining process can prevent dust from accumulating in the gap of the can cover by coating the surface of the finished can. The user can tear off the coating while opening the pull ring to avoid inhaling bacteria and dirt contaminated by the can cover during transportation and storage, making the can cleaner and more hygienic when used. At the same time, the can with this feature is more adaptable to market demand and easier to promote.

[0022] 2. This type of aluminum can and its mechanical processing technology can achieve the coating of the finished cans by adopting three methods. The factory can make a choice according to its own production conditions when carrying out the final packaging of the cans, which is easier to promote the coating technology of the cans. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The present invention is a production process flow chart of the aluminum can. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Embodiment: The embodiment of the present invention provides an aluminum can, comprising a can body, a can cover, a pull ring and a coating protective layer, the top of the can body is sealed and fixedly connected to the can cover, the pull ring is riveted to the middle of the upper surface of the can cover, and the outer surfaces of the can body, the can cover and the pull ring are jointly covered with a coating protective layer, and the coating protective layer is provided with a tearable cross-link at the position of the pull ring corresponding to the position of the pull ring.

[0026] A mechanical processing technology for aluminum cans includes the following specific steps:

[0027] Step 1: Production of can body: First, the aluminum raw material is punched into a 0.3mm thick round aluminum sheet using a large punching machine, and then the round aluminum sheet is pulled into a thin-walled cup using a cup punching machine and a drawing machine, and the bottom of the cup is punched into a concave arch shape. Subsequently, the top of the thin-walled cup is necked to form a can mouth;

[0028] Step 2, production of can lid: the aluminum raw material is punched and stretched into a lid blank by a punching machine, and then the lid blank is curled by a curling machine, and a sealing hook edge is rolled out to form a basic lid, and a sealant is applied on the lid groove, dried, and cured, and then the basic lid is subjected to the steps of blister formation, rivet buckle formation, notching, riveting, and lettering to form a finished lid;

[0029] Step 3: Assembling the can body and the cover body: rolling the top opening of the can body and the edge of the finished cover together to form an airtight cavity for sealing, thereby forming a finished can to be packaged;

[0030] Step 4, coating: coating the outer surface of the finished can, the film protection layer is divided into two parts: a protective layer body and a tearing part, the protective layer body is sleeved and attached to the main part of the can body and the cover body, the tearing part is attached to the upper surface of the pull ring, and the protective layer body and the tearing part are segmented and multi-point cross-linked.

[0031] Specifically, a method for laminating a finished can to be packaged is provided: a safety film is applied to the finished can to be packaged to cover a layer by hot air blowing, and the safety film is attached to the upper surface to form a heat shrink film similar to a reverse blow molding process, and the finished can to be packaged is wrapped;

[0032] Among them, after the safety film is attached to the easy-open cover, a punching needle should be used to contact the safety film to punch holes to expel the bubbles between the safety film and the easy-open cover.

[0033] Specifically, a method for coating finished cans to be packaged is provided: a layer of food-grade gel coat is sprayed on the surface of the finished cans to be packaged by a masking spraying method, and then a point pressure is applied to the torn opening of the cans to achieve cross-linking of the film protective layer;

[0034] Among them, a layer of gel coat is sprayed on it and then torn off when used. The bending process of the pull ring will pull the edge apart, and then the gel coat can be torn off to reveal the clean finished can inside.

[0035] Specifically, a method for laminating finished cans to be packaged is provided: using a mold adapted to the cans to be packaged, and using the mold to press a plastic film to adhere to the surface of the cans to be packaged;

[0036] Among them, a mold is used to correspond to the surface composite film protective layer to thermoplasticize this layer of film. This mode is still coating, but the biggest difference from the first method is that it is not blown but pressed on, which can also achieve the effect of coating the cans.

[0037] In the present application, by adopting the method of coating the surface of the finished cans, dust can be prevented from accumulating in the gaps of the cans' covers. Users can tear off the coating while opening the pull ring, thereby avoiding inhaling bacteria and dirt contaminated on the cans' covers during transportation and storage, making the cans cleaner and more hygienic when in use. At the same time, cans with this feature are more adaptable to market demand and easier to promote. At the same time, all three methods can be used to coat the finished cans. Factories can make choices based on their own production conditions when performing the final packaging of the cans, which makes it easier to promote the coating process of the cans.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An aluminum can, characterized in that: It comprises a can body, a can cover, a pull ring and a coating protective layer, wherein the top of the can body is sealed and fixedly connected to the can cover, the pull ring is riveted to the middle of the upper surface of the can cover, and the outer surfaces of the can body, the can cover and the pull ring are jointly covered with a coating protective layer, and the coating protective layer is provided with a tearable cross-link corresponding to the position of the pull ring.

2. The machining process of aluminum cans according to claim 1, characterized in that: The specific steps include: Step 1: Production of can body: First, the aluminum raw material is punched into a 0.3mm thick round aluminum sheet using a large punching machine, and then the round aluminum sheet is pulled into a thin-walled cup using a cup punching machine and a drawing machine, and the bottom of the cup is punched into a concave arch shape. Subsequently, the top of the thin-walled cup is necked to form a can mouth; Step 2, production of can lid: the aluminum raw material is punched and stretched into a lid blank by a punching machine, and then the lid blank is curled by a curling machine, and a sealing hook edge is rolled out to form a basic lid, and a sealant is applied on the lid groove, dried, and cured, and then the basic lid is subjected to the steps of blister formation, rivet buckle formation, notching, riveting, and lettering to form a finished lid; Step 3: Assembling the can body and the cover body: rolling the top opening of the can body and the edge of the finished cover together to form an airtight cavity for sealing, thereby forming a finished can to be packaged; Step 4, coating: coating the outer surface of the finished can, the film protection layer is divided into two parts: a protective layer body and a tearing part, the protective layer body is sleeved and attached to the main part of the can body and the cover body, the tearing part is attached to the upper surface of the pull ring, and the protective layer body and the tearing part are segmented and multi-point cross-linked.

3. The machining process of aluminum cans according to claim 2, characterized in that: Provided is a method for laminating finished cans to be packaged: using hot air blowing to cover the finished cans with a safety film and adhere it to the upper surface to form a heat shrink film similar to a reverse blow molding process to wrap the finished cans to be packaged.

4. The machining process of aluminum cans according to claim 3, characterized in that: Provided is a method for coating finished cans to be packaged: spraying a layer of food-grade gel coat on the surface of the finished cans to be packaged by a masking spraying method, and then simultaneously performing point pressure on the torn opening of the cans to achieve cross-linking of the film protective layer.

5. The machining process of aluminum cans according to claim 4, characterized in that: Provided is a method for laminating finished cans to be packaged: using a mold matched with the cans to be packaged, and using the mold to press a plastic film to adhere to the surface of the cans to be packaged.

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