CN110667999A

CN110667999A - Metal can and manufacturing method thereof

Info

Publication number: CN110667999A
Application number: CN201911062271.9A
Authority: CN
Inventors: 黄伟刚
Original assignee: Guangdong Daweiye Environmental Protection Packaging Technology Co Ltd
Current assignee: Guangdong Daweiye Environmental Protection Packaging Technology Co Ltd
Priority date: 2019-11-02
Filing date: 2019-11-02
Publication date: 2020-01-10

Abstract

A metal can and its preparation method, the metal can includes the outer barrel with outer barrel cover, outer barrel cover and outer barrel adopt the metal to make respectively, also include the plastic bag set up in outer barrel, there are eye ring and second pilot hole on the outer barrel cover, there are plastic pipe joints on the plastic bag, the outer barrel cover seals the opening part in the outer barrel, the plastic pipe joint is worn out and fixed in the second pilot hole, the outer wall of the plastic bag after aerating is hugged closely with the part of the inner wall of outer barrel, the area that the outer wall of the plastic bag and part of the inner wall of outer barrel are hugged closely, exceed half of the total internal surface area of the inner wall of outer barrel. A method of making a metal can comprising the steps of: welding a rectangular tinplate cut into a cylinder, stretching the cylinder into a square outer barrel body through an expansion mould, and finally respectively bending and forming the top and bottom ends of the outer barrel body through a flanging mould. The invention has the characteristics of aesthetic property, falling resistance and corrosion resistance.

Description

Metal can and manufacturing method thereof

Technical Field

The invention relates to a metal can and a manufacturing method thereof.

Background

The metal package, paint is tinplate package because of its good leakproofness, storability, light-shading, sturdiness and special metal decorative charm, has determined that it has extensive coverage in the packaging container industry, is the universal packing variety in the world. With the continuous abundance of various CC materials, DR materials and ferrochromium plating materials of the tinplate, the development of packaging products and technologies is promoted, and the tinplate packaging is completely innovative. The tinplate packaging container has strong oxidation resistance, various styles and exquisite printing, is deeply favored by customers, and is widely applied to the aspects of food packaging, medicine packaging, commodity packaging, instrument and meter packaging, industrial product packaging and the like.

The prospective industry research institute points out in the market prospective and investment strategy planning analysis report of the Chinese tin plate packaging container industry in 2014-plus 2018: the tinplate packaging container has many advantages of high strength, good formability, strong compatibility with products and the like, and establishes a good 'public praise' in the international market. Therefore, the packaging container is generally regarded by all countries, and is a metal packaging plate with the largest usage in the world. The research group of the tinplate packaging container industry of the prospective industry research institute shows that the continuous and rapid development of the food industry brings wide market development space for the tinplate packaging container industry.

Even though tinplate packaging has many excellent properties, the obvious limitation still exists, and the tinplate packaging is not generally used for substances which have corrosiveness or are easy to react with metal. Glass and plastic are preferred for packaging, but the falling resistance of the glass and the plastic is poor, so that inconvenience is brought to product transportation, the recycling difficulty is high, the glass and the plastic are hardly degradable in the natural world, and the glass and the plastic are not environment-friendly.

Chinese patent document No. CN 201658970U discloses an enamel reactor in 2010, 12 months and 01 days, which comprises an iron shell, an enamel inner container, a plastic bucket and a support strip, wherein the plastic bucket is sleeved in the enamel inner container. The plastic barrel is fixedly connected with the enamel inner container by a support strip. The circular arc bottom and the cylinder of plastic drum go up drilling, the sieve mesh distributes: drilling phi at the bottom of the arc to be 1 centimeter, and densely distributing small holes; the cylinder is drilled in two parts: the upper part phi is 5 cm and occupies the height of the barrel 1/3; the lower part phi is 3 cm and occupies the height of the barrel 2/3. The enamel reaction kettle has a complex structure and high manufacturing cost and needs to be improved.

Disclosure of Invention

The invention aims to provide a drop-resistant and corrosion-resistant metal can and a manufacturing method thereof, so as to overcome the defects in the prior art.

The metal can is characterized by further comprising a plastic bag arranged in the outer can body, the outer can cover is provided with a handle and a second assembly hole, a plastic pipe joint is arranged on the plastic bag, the outer can cover is packaged at the opening of the outer can body, the plastic pipe joint penetrates out of and is fixed in the second assembly hole, the outer wall of the inflated plastic bag is tightly attached to the part of the inner wall of the outer can body, and the area of the outer wall of the plastic bag tightly attached to the part of the inner wall of the outer can body is more than half of the total inner surface area of the inner wall of the outer can body.

Furthermore, the plastic bag comprises at least two plastic films which are arranged oppositely, wherein a first assembly hole is formed in one plastic film, and the plastic pipe joint is welded on the first assembly hole through ultrasonic welding.

Further, the thickness of the plastic film is greater than or equal to 15 μm; the thicknesses of the outer barrel cover and the outer barrel body are respectively 0.16 mm-0.40 mm.

Further, the plastic bag is in any one or the combination of any two or more of a square shape, a triangular shape, a circular shape and an oval shape; the cross section of the outer barrel body is in any one or the combination of more than any two of square, triangle, circle and ellipse; the outer barrel cover is arranged corresponding to the outer barrel cover.

Further, the inner wall of the outer barrel body comprises a front inner wall, a rear inner wall, a left inner wall, a right inner wall and a bottom inner wall; the area of the outer wall of the plastic bag, which is tightly attached to the local part of the inner wall of the outer barrel body, exceeds three-fourths of the total inner surface area of the inner wall of the outer barrel body.

Furthermore, the inner wall of the outer barrel body is provided with a convex rib or a groove.

Furthermore, the outer wall of the inflated plastic bag is tightly attached to the local part of the inner wall of the outer barrel body and is welded into a whole through ultrasonic waves.

Further, the metal includes tinplate, galvanized iron, stainless steel, aluminum, base plate iron, or chrome-plated iron.

A method for manufacturing a metal can, comprising the steps of:

firstly, welding a metal plate cut into a rectangle into a cylinder, then stretching the cylinder into an outer barrel body with a square, triangular, circular or oval cross section through an expansion mould, and finally respectively bending the top and bottom ends of the outer barrel body into bending edges through a flanging mould;

step two, connecting a square, triangular, circular or elliptical outer barrel bottom and an outer barrel body with a square, triangular, circular or elliptical cross section into a whole through a bent edge by using can sealing equipment, thereby manufacturing an outer barrel body;

step three, placing the plastic bag with the plastic pipe joint into the outer barrel body, and injecting air into the plastic bag through the plastic pipe joint to enable the expanded outer wall of the plastic bag to be tightly attached to the local part of the inner wall of the outer barrel body; obtaining a first semi-finished product;

step four, connecting the outer barrel cover with the lifting handle and the second assembling hole with the outer barrel body into a whole through a can sealing device; the plastic pipe joint penetrates out of and is fixed at the second assembling hole; obtaining a second semi-finished product;

and step five, sequentially sleeving the outer joint and the outer cover on the plastic pipe joint to obtain a finished product.

And further, a sixth step is arranged between the third step and the fourth step, and in the sixth step, the outer wall of the expanded plastic bag tightly attached to the inflated plastic bag is welded with the local part of the inner wall of the outer barrel body into a whole through ultrasonic welding equipment.

Further, the step four, the plastic pipe joint and the second assembling hole are welded into a whole through ultrasonic waves.

When the plastic bag is used, the outer cover is opened, liquid is filled into the plastic bag through the outer joint and the plastic pipe joint, and then the outer cover is covered.

The plastic bag is arranged in the metal outer barrel body, the handle and the second assembly hole are formed in the metal outer barrel cover, the plastic pipe joint is arranged on the plastic bag, the outer barrel cover is sealed at the opening of the outer barrel body, the plastic pipe joint penetrates out of and is fixed in the second assembly hole, and the outer wall of the inflated plastic bag is tightly attached to the local part of the inner wall of the outer barrel body; the area of the outer wall of the plastic bag, which is tightly attached to the local part of the inner wall of the outer barrel body, exceeds half of the total inner surface area of the inner wall of the outer barrel body; the metal includes tinplate, galvanized iron, stainless steel, aluminum, base plate iron or chrome-plated iron. Because the traditional tinplate package is generally only applied to liquid or solid which can not generate chemical reactions such as corrosion, rusting and the like on metal; the plastic can make up the defects of the tinplate package, but has the defects of falling resistance and environmental protection. Through the combination of the two, can keep the beautiful outward appearance and the resistant performance of tinplate package, can also keep the stability of plastics on the packing, be difficult for producing the reaction with the packing object to and reduce in the use amount of plastics, thereby make the range of application of tinplate package wider.

In order to further improve the product quality, the outer wall of the inflated plastic bag and the local part of the inner wall of the outer barrel body can be welded into a whole through ultrasonic waves. The ultrasonic welding is that 50/60 Hz current is converted into high-frequency electric energy of 15, 20, 30 or 40kHz by an ultrasonic generator, the converted high-frequency electric energy is converted into mechanical motion with the same frequency again by a transducer, then the mechanical motion is transmitted to a welding head by a set of amplitude transformer device capable of changing amplitude, the welding head transmits the received vibration energy to a joint to be welded, namely a local clinging part of the outer wall of the inflated plastic bag and the inner wall of the outer barrel body, in the area, the vibration energy is converted into heat energy by a friction mode, the plastic is melted, and the outer wall of the plastic bag and the inner wall of the outer barrel body are welded into a whole.

The invention not only has the aesthetic property of metal package and the falling resistance brought by high strength, but also can perfectly solve the corrosion problem of corrosive liquid to metal, and the leakage problem of welding seams, winding wires and the like in the can making process can be effectively solved because the outer barrel body is not directly contacted; moreover, after the technical scheme is adopted, the thicknesses of the outer barrel cover and the outer barrel body are respectively 0.16-0.40 mm, the thickness of the plastic film is more than or equal to 15 mu m, the material cost is much less than that of a common metal barrel, particularly a traditional tinplate barrel, and the manufacturing cost is greatly reduced.

In conclusion, the invention not only retains the advantages of common metal packaging, but also utilizes the plastic to make up the defects of common metal, especially tinplate packaging, simultaneously reduces the use of the plastic and the tinplate, and improves the drop-resistant and corrosion-resistant properties of the product.

Drawings

Fig. 1 is a schematic view illustrating a manufacturing process of an outer tub according to an embodiment of the present invention.

Fig. 2 is a front enlarged view of the outer tub.

FIG. 3 is a schematic view of the manufacturing process of the outer tub.

Fig. 4 is a schematic view of a manufacturing process of the first semi-finished product.

Fig. 5 is a schematic view of a manufacturing process from a first semi-finished product to a second semi-finished product.

Fig. 6 is an enlarged schematic view of a portion a in fig. 5.

Fig. 7 is a schematic view of the manufacturing process from the second semi-finished product to the finished product.

Fig. 8 is a schematic view of a plastic bag before fitting of a plastic tubing joint.

Fig. 9 is an assembly view of the plastic pipe joint, the outer joint and the outer cover.

In the figure: 1 is the tinplate, 2 is outer ladle body, 2.1 is the limit of bending, 3 is outer barrel head, 4 is outer ladle body, 5 is the plastic bag, 5.1 is the plastic union, 5.2 is first pilot hole, 5.3 is the welding strip, 6 is first semi-manufactured goods, 7 is outer ladle lid, 7.1 is the second pilot hole, 8 is second semi-manufactured goods, 9.1 is the enclosing cover, 9.2 is the outer joint, 10 is the finished product.

Detailed Description

The invention is further described with reference to the following figures and examples.

First embodiment

Referring to fig. 1-9, the metal can comprises an outer can body 4 with an outer can cover 7, wherein the outer can cover 7 and the outer can body 4 are made of metal respectively, the metal can further comprises a plastic bag 5 arranged in the outer can body 4, a handle and a second assembly hole 7.1 are arranged on the outer can cover 7, a plastic pipe joint 5.1 is arranged on the plastic bag 5, the outer can cover 7 is packaged at an opening of the outer can body 4, the plastic pipe joint 5.1 penetrates out of and is fixed in the second assembly hole 7.1, the outer wall of the inflated plastic bag 5 is tightly attached to the part of the inner wall of the outer can body 4, and the area of the outer wall of the plastic bag 5 tightly attached to the part of the inner wall of the outer can body 4 is more than half of the total inner. The metal includes tinplate, galvanized iron, stainless steel, aluminum, base plate iron or chrome-plated iron.

Preferably, the area of the outer wall of the inflated plastic bag 5, which is tightly attached to the local part of the inner wall of the outer barrel body 4, exceeds three-quarters of the total inner surface area of the inner wall of the outer barrel body 4.

In this embodiment, the volume of the inflated plastic bag 5 should be not less than the volume of the outer barrel 4, and may be greater than or equal to the volume.

The plastic bag 5 comprises at least two plastic films which are arranged oppositely, wherein a first assembly hole 5.2 is formed in one plastic film, and the plastic pipe joint 5.1 is welded on the first assembly hole 5.2 through ultrasonic welding. The plastic film can be made of environment-friendly PP materials.

The thickness of the plastic film is greater than or equal to 15 μm. In the present embodiment, the thicknesses of the outer tub cover 7 and the outer tub 4 are 0.16mm to 0.40mm, respectively.

The plastic bag 5 is in any one of a square shape, a triangular shape, a circular shape and an oval shape or a combination of any two or more. The cross section of the outer barrel body 3 is any one or the combination of more than any two of square, triangle, circle and ellipse; the outer barrel cover 7 is arranged corresponding to the outer barrel cover.

The inner wall of the outer barrel body 4 comprises a front inner wall, a rear inner wall, a left inner wall, a right inner wall and a bottom inner wall.

In order to further improve the product quality, the outer wall of the inflated plastic bag 5 and the inner wall of the outer barrel body 4 can be welded into a whole by ultrasonic waves.

In order to further improve the product quality, a rib or a groove can be arranged on the inner wall of the outer barrel body 4.

The following description will be made by taking a product in a square shape as an example.

A method of making a metal can, comprising the steps of:

firstly, welding a metal plate 1 cut into a rectangle into a cylinder, then stretching the cylinder into a square outer barrel body 2 through an expansion mould, and finally respectively bending two ends of the top and bottom of the outer barrel body 2 into bending edges 2.1 through a flanging mould;

step two, the square outer barrel bottom 3 and the square outer barrel body 2 are connected into a whole through a bent edge 2.1 through can sealing equipment, so that an outer barrel body 4 is manufactured;

step three, placing the plastic bag 5 with the plastic pipe joint 5.1 into the outer barrel body 4, injecting air into the plastic bag 5 through the plastic pipe joint 5.1, and enabling the expanded outer wall of the plastic bag 5 to be tightly attached to the local part of the inner wall of the outer barrel body 4; obtaining a first semi-finished product 6;

step four, connecting the outer barrel cover 7 with a handle and a second assembling hole 7.1 with the outer barrel body 4 into a whole through a tank sealing device; the plastic pipe joint 5.1 penetrates out of and is fixed at the second assembling hole 7.1; obtaining a second semi-finished product 8;

and step five, sequentially sleeving the outer joint 9.2 and the outer cover 9.1 on the plastic pipe joint 5.1 to obtain a finished product 10.

In order to further improve the product quality, a sixth step is further arranged between the third step and the fourth step, and in the sixth step, the expanded outer wall of the inflated plastic bag 5 which is tightly attached together is welded with the local part of the inner wall of the outer barrel body 4 into a whole through ultrasonic welding equipment.

During the ultrasonic welding, the plastic bag 5 needs to be kept in the inflated state all the time, for example, the plastic bag 5 can be kept in the inflated state all the time until the welding is finished by always inflating the plastic bag, or after the plastic bag 5 is inflated and expanded, the plastic pipe joint 5.1 is plugged by using an auxiliary cap plug or other plugging components to keep the plastic bag 5 in the inflated state all the time until the welding is finished. Of course, other methods of maintaining the plastic bag 5 in its inflated condition until the welding is complete may be used.

Step four, welding the plastic pipe joint 5.1 and the second assembling hole 7.1 into a whole through ultrasonic waves

In use, the outer cover 9.1 is opened, the plastic bag is filled with liquid through the outer joint 9.2 and the plastic pipe joint 5.1, and then the outer cover 9.1 is closed.

The plastic pipe joint 5.1 and the plastic bag 5 can be bonded or ultrasonically welded into a whole.

Second embodiment

In this embodiment, when it is desired to make triangular, circular or oval shaped products,

firstly, welding a rectangular metal plate 1 into a cylinder, then stretching the cylinder into an outer barrel body 2 with a triangular, circular or oval cross section through an expansion mould, and finally respectively bending and forming bending edges 2.1 at the top and bottom ends of the outer barrel body 2 through a flanging mould.

And step two, connecting the outer barrel bottom 3 with the cross section of a triangle, a circle or an ellipse with the outer barrel body 2 of a triangle, a circle or an ellipse into a whole through a bending edge 2.1 by a can sealing device, thereby manufacturing the outer barrel body 4.

Step three, placing the plastic bag 5 with the plastic pipe joint 5.1 into the outer barrel body 4, injecting air into the plastic bag 5 through the plastic pipe joint 5.1, and enabling the expanded outer wall of the plastic bag 5 to be tightly attached to the local part of the inner wall of the outer barrel body 4; a first semifinished product 6 is obtained.

Step four, connecting the triangular, circular or elliptical outer barrel cover 7 with the handle and the second assembling hole 7.1 with the outer barrel body 4 into a whole through a can sealing device; the plastic pipe joint 5.1 penetrates out of and is fixed at the second assembling hole 7.1; a second semi-finished product 8 is obtained.

The rest of the parts which are not described in the first embodiment are not described in detail.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A metal can comprises an outer can body (4) with an outer can cover (7), wherein the outer can cover (7) and the outer can body (4) are respectively made of metal, and the metal can is characterized by also comprising a plastic bag (5) arranged in the outer can body (4), the outer can cover (7) is provided with a lifting handle and a second assembly hole (7.1), the plastic bag (5) is provided with a plastic pipe joint (5.1), the outer can cover (7) is packaged at an opening of the outer can body (4), and the plastic pipe joint (5.1) penetrates out and is fixed on the second assembly hole (7.1); the outer wall of the inflated plastic bag (5) is tightly attached to the local inner wall of the outer barrel body (4), and the area of the outer wall of the plastic bag (5) tightly attached to the local inner wall of the outer barrel body (4) is more than half of the total inner surface area of the inner wall of the outer barrel body (4).

2. Metal can according to claim 1, wherein the plastic bag (5) comprises at least two oppositely arranged plastic films, wherein one of the plastic films is provided with a first fitting hole (5.2), and the plastic pipe connector (5.1) is ultrasonically welded to the first fitting hole (5.2).

3. The metal can according to claim 2, wherein the plastic film has a thickness of 15 μm or more; the thicknesses of the outer barrel cover (7) and the outer barrel body (4) are respectively 0.16 mm-0.40 mm.

4. The metal can according to claim 1, wherein the plastic bag (5) has any one of or a combination of two or more of a square shape, a triangular shape, a circular shape and an oval shape; the cross section of the outer barrel body (3) is in any one or the combination of more than any two of square, triangle, circle and ellipse; the outer barrel cover (7) is arranged corresponding to the outer barrel cover.

5. The metal can according to claim 1, wherein the inner wall of the outer can body (4) comprises a front inner wall, a rear inner wall, a left inner wall, a right inner wall, and a bottom inner wall; the area of the outer wall of the plastic bag (5) and the local part of the inner wall of the outer barrel body (4) which are tightly attached exceeds three-fourths of the total inner surface area of the inner wall of the outer barrel body (4).

6. A metallic tank as in claim 1, characterized in that the inner wall of the outer tank body (4) is provided with ribs or grooves.

7. The metal can as defined in any of claims 1 to 6, wherein the outer wall of said inflated plastic bag (5) is closely attached to a part of the inner wall of said outer can body (4) and is welded integrally by ultrasonic welding; the metal includes tinplate, galvanized iron, stainless steel, aluminum, base plate iron or chrome-plated iron.

8. A method of manufacturing a metal can according to claim 1, comprising the steps of:

firstly, welding a metal plate (1) cut into a rectangle into a cylinder, then stretching the cylinder into an outer barrel body (2) with a square, triangular, circular or oval cross section through an expansion mould, and finally respectively bending two ends of the top and the bottom of the outer barrel body (2) into bending edges (2.1) through a flanging mould;

secondly, connecting a square, triangular, circular or elliptical outer barrel bottom (3) and an outer barrel body (2) with a square, triangular, circular or elliptical cross section into a whole through a bent edge (2.1) by using can sealing equipment, so as to obtain an outer barrel body (4);

step three, placing the plastic bag (5) with the plastic pipe joint (5.1) into the outer barrel body (4), and injecting air into the plastic bag (5) through the plastic pipe joint (5.1) to enable the expanded outer wall of the plastic bag (5) to be tightly attached to the local part of the inner wall of the outer barrel body (4); obtaining a first semi-finished product (6);

step four, connecting an outer barrel cover (7) with a handle and a second assembling hole (7.1) with the outer barrel body (4) into a whole through a tank sealing device; the plastic pipe joint (5.1) penetrates out of and is fixed on the second assembly hole (7.1); obtaining a second semi-finished product (8);

and step five, sequentially sleeving the outer joint (9.2) and the outer cover (9.1) on the plastic pipe joint (5.1) to obtain a finished product (10).

9. The method for manufacturing a metal can according to claim 8, wherein a sixth step is further provided between the third step and the fourth step, and in the sixth step, the outer wall of the expanded plastic bag (5) tightly adhered to the inflated plastic bag is welded to the local part of the inner wall of the outer can body (4) into a whole by ultrasonic welding equipment.

10. The method of manufacturing a metal can according to claim 8, wherein the fourth step further comprises welding the plastic pipe joint (5.1) and the second fitting hole (7.1) as one body by ultrasonic waves.