Non-uniform distribution steel roller for two-piece cans and glazing assembly for two-piece cans

Abstract

The utility model belongs to the technical field of manufacturing of two-piece cans, and particularly relates to a non-uniform distribution steel roller for two-piece cans and a glazing assembly for the two-piece cans. The glazing surface is used for coating gloss oil, the glazing surface is in a cylindrical surface shape, and a tank head area, a tank middle area and a tank tail area are sequentially arranged from one end to the other end of the glazing surface; ink cells with the same size are arranged on the glazing surface; the ink cell density of the tank head area and the tank tail area is larger than that of the tank middle area. According to the utility model, the glazing surface is divided into three areas, and the ink release amount of different areas is adjusted by changing the density of the ink cells under the condition of fixing the sizes of the ink cells, so that the partitioned coating of the gloss oil on the can body of the two-piece can is realized. And under the condition of ensuring the wear resistance of the two-piece can in long-distance transportation, the use amount of the gloss oil is reduced, so that the production cost is effectively reduced, and popularization and application in production practice are facilitated.

Description

Technical Field

[0001] This utility model belongs to the field of two-piece can manufacturing technology, specifically relating to a non-uniformly distributed steel roller for two-piece cans and a two-piece can polishing assembly. Background Technology

[0002] Two-piece cans are a common type of container in the beverage industry, consisting of a can body and a lid. The can body is made by stretching a thin sheet of metal, making the bottom and body a single unit. Because the can body is directly formed using a stamping process, it is leak-proof, eliminating the need for leak testing and ensuring product quality. Two-piece cans do not require welding for sealing, avoiding lead contamination from soldered cans, and are resistant to high-temperature sterilization, ensuring product hygiene. Furthermore, the seamless design of the can body results in an aesthetically pleasing appearance, and continuous decorative printing can be applied to achieve excellent results.

[0003] To improve grip and enhance can strength, two-piece cans typically extend outwards, creating a structure where the can body is larger than the lid and bottom. This results in two annular bends between the can body and the lid / bottom, which are highly susceptible to friction with other cans or devices during production and transportation. After the can design is printed, a layer of varnish is usually applied. This varnish's main function is to protect the design from damage caused by abrasion during high-speed conveyor belts and transportation. In traditional two-piece can manufacturing, the varnish is applied evenly to the can body. This leads to a problem: the more frequent friction at the bends causes the varnish to wear off completely, eventually wearing away the printed design; while other parts of the can body experience less friction, resulting in wasted varnish.

[0004] To address the aforementioned issues, an improved varnishing steel roller, as disclosed in patent 201620127665.3, modifies the amount of varnish by changing the size of the mesh openings on the steel roller. This solution divides the steel roller into five zones, with the mesh openings in the transition zones between the varnishing steel roller and the bottom and neck of the semi-finished product tank being larger than those in other zones. However, due to the viscosity of the varnish, different mesh sizes result in varying amounts of residual varnish during coating. After prolonged use, the actual coating amount in different zones will differ significantly from the set value. Utility Model Content

[0005] The present invention aims to overcome the shortcomings of existing technologies where steel rollers cannot specifically coat the easily worn areas of two cans, and provides a non-uniformly distributed steel roller for two cans and a two-can coating assembly to overcome the above-mentioned shortcomings.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0007] A two-piece non-uniformly distributed steel roller, comprising:

[0008] A coating surface for applying varnish, wherein the coating surface is cylindrical and the coating surface is divided into a can head area, a can middle area and a can tail area from one end to the other.

[0009] The polished surface is provided with mesh holes of the same size;

[0010] The mesh density in the head and tail areas of the tank is greater than that in the middle area.

[0011] In traditional two-piece can manufacturing, a layer of varnish is applied to the printed can body. This varnish not only makes the can surface smoother and glossier but also protects the printed design. Since two-piece cans undergo necking and capping processes after printing, the cans inevitably rub against other components or cans. Therefore, the primary purpose of applying varnish is to prevent wear and tear on the printed design, which could affect product quality. On two-piece cans commonly found in the beverage industry, two annular protrusions are typically present on the can body for better grip and increased strength. The protrusion at the tail is formed by stamping, while the protrusion at the head is formed by the subsequent necking process. These protrusions not only rub frequently against other components during manufacturing but also tend to rub against each other during transport. Therefore, it is necessary to increase the amount of varnish applied to these areas.

[0012] Traditional coating rollers have numerous uniformly distributed mesh holes, which evenly distribute varnish across the two cans during operation. However, to achieve sufficient varnish coverage for the two protruding areas, too much varnish is applied to the can body, resulting in waste and increased manufacturing costs. Furthermore, if the mesh holes on the roller are of varying sizes, the viscosity of the varnish makes smaller holes more prone to varnish residue, leading to inconsistent coating results on both cans and requiring frequent cleaning of the roller. Therefore, this invention features a steel roller with unevenly distributed, uniformly sized mesh holes. The varying mesh density divides the coating surface into three zones: the can head zone, the can middle zone, and the can tail zone. The mesh density in the can head and can tail zones is greater than that in the can middle zone. This three-zone design addresses the challenge of controlling varnish application with too many zones while also allowing for portioned varnish application, effectively saving costs.

[0013] Preferably, the ratio of cell density in the can head area, middle area, and tail area is 8:7:10 to 9:7:11. During transport, the tail area is more susceptible to wear than the head area; therefore, the cell density in the tail area is slightly increased. In practice, the preferred ink distribution is 24 BCM at the can opening, 21 BCM in the middle, and 30 BCM at the bottom.

[0014] Preferably, the area ratio of the can head area, the can middle area, and the can tail area is 3:10:4 to 4:10:5. Since the height of the two cans is usually less than the length of the steel roller during actual varnish application, the height of the can head area and the can tail area is slightly increased compared to the can body to ensure that the varnish can cover the annular protruding area, thereby expanding the coating area and ensuring the coating effect.

[0015] Preferably, the cells are regular hexagons. The hexagonal cells form a honeycomb-like mesh, which has the most compact arrangement, the largest ink storage capacity, and excellent ink release, while reducing edge effects. In practice, the bottom of the cells can be "V"-shaped or "U"-shaped, with "U"-shaped cells being preferred to improve the ink release rate.

[0016] Preferably, the polished surface is covered with a ceramic layer, and the mesh is disposed on the ceramic layer. The ceramic layer can reduce wear on the steel roller and prevent varnish from penetrating the base layer of the steel roller.

[0017] Preferably, it also includes end faces disposed at both ends of the glossy surface to support the glossy surface, thereby forming a cavity between the end faces and the glossy surface.

[0018] As a further preferred embodiment, each of the two end faces is provided with a bearing hole at its center, which can accommodate the bearing, and the bearing hole is provided with a limiting slot for fixing the bearing.

[0019] As a further preferred embodiment, the end face is provided with positioning holes for fixing the bearing around the bearing hole.

[0020] As a further preferred embodiment, the bearing hole and the limiting slot are provided with a thickened portion on the side near the cavity. In order to increase the connection stability between the bearing and the steel roller, the thickened portion is provided at the bearing hole and the limiting slot, which can not only strengthen the strength of this part, but also increase the contact area between the protrusion on the bearing and the limiting slot.

[0021] This utility model also discloses a two-piece can varnishing assembly, including the aforementioned non-uniformly distributed steel rollers for the two cans, and a rubber roller for coating the two cans, wherein the rubber roller is tangential to and in close contact with the varnishing surface. The varnish on the varnishing surface is first applied to the rubber roller according to the zones, and then applied to the can bodies of the two cans through the rubber roller.

[0022] Therefore, this utility model has the following beneficial effects:

[0023] (1) By dividing the gloss surface into three areas, this utility model reduces the amount of varnish used and the dry film weight by changing the coating distribution and thickness while ensuring the wear resistance of the can during long-distance transportation.

[0024] (2) In this invention, under the condition of determining the size of the mesh, the amount of ink released in different areas is adjusted by changing the mesh density, and the error caused by long-term use due to the viscosity of the varnish is reduced as much as possible.

[0025] (3) By changing the cell density, this utility model obtains a more suitable distribution of varnish on two cans, further reducing the consumption of varnish and effectively reducing production costs, which is conducive to its promotion and application in production practice. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the non-uniformly distributed steel roller structure of the two cans of this utility model.

[0027] Figure 2 This is a schematic cross-sectional view of the two non-uniformly distributed steel rollers of this utility model.

[0028] Figure 3 This is a front view of the two non-uniformly distributed steel rollers of this utility model.

[0029] Figure 4 This is a schematic diagram of the mesh of the two non-uniformly distributed steel rollers in Embodiment 1 of this utility model.

[0030] Figure 5 This is a photograph of the mesh of the two non-uniformly distributed steel rollers in Embodiment 1 of this utility model.

[0031] Figure 6 This is a schematic diagram of the operation of the two-piece can-lighting assembly in Embodiment 2 of this utility model.

[0032] In the figure: 1. Polished surface; 2. Can head area; 3. Can middle area; 4. Can tail area; 5. Rubber roller; 10. Mesh cavity; 11. Ceramic layer; 30. End face; 31. Cavity; 32. Bearing hole; 33. Limiting slot; 34. Positioning hole; 35. Thickened part. Detailed Implementation

[0033] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Those skilled in the art will be able to implement the present invention based on these descriptions. Furthermore, the embodiments of the present invention described below are generally only a part of the embodiments of the present invention, and not all of the embodiments. Therefore, all other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0034] Example 1:

[0035] In this embodiment, the two cans have non-uniformly distributed steel rollers, such as Figure 1 As shown, including the polished surface 1 and the end faces 30 at both ends that provide support, the steel roller is cylindrical in shape. Figure 3 As shown, pre-drilled holes are made on the end face 30, including bearing holes 32 for inserting bearings, limiting slots 33 for restricting relative rotation of bearings, and four positioning holes 34 for fixing bearings. For example... Figure 2 The diagram shows a cross-sectional view of the steel roller. A cavity 31 exists between the polished surface 1 and the end faces 30 at both ends to reduce the weight of the steel roller and decrease bearing pressure. Furthermore, the thickness of the bearing hole 32 and the limiting slot 33 within the cavity 31 is greater than the thickness of the end face 30, forming a thickened portion 35. During use, the bearing passes through the bearing hole 32, and the protrusion on the bearing is engaged within the limiting slot 33. The bearing is then fixed to the positioning hole 34 using positioning screws. Through this structure, when the bearing rotates, the presence of the limiting slot 33 allows the bearing to transmit rotational force to the steel roller via the thickened portion 35. The engagement of the positioning hole 34 and the positioning screws prevents the steel roller from shifting during rotation, thus creating a stable rotation structure for the steel roller.

[0036] like Figure 4 As shown, to ensure that the varnish adheres to the steel roller without corroding it, a ceramic layer 11 engraved with holes 10 is applied to the polished surface 1. All the holes 10 are closely arranged in regular hexagons, and the bottom of each hole 10 is U-shaped to prevent varnish residue. Many holes 10 combine to form a final shape. Figure 5 The honeycomb shape is shown. In this embodiment, all cells 10 are the same size. The key to achieving uneven coating is to follow the... Figure 2 The partitions shown have cells 10 engraved at different densities in the can head area 2, can middle area 3, and can tail area 4, with a cell density ratio of 8:7:10 and an area ratio of 3:10:4. After applying varnish to the coating surface 1, the varnish enters the cells 10, with areas of higher cell density holding more ink and areas of lower cell density holding less ink. As the steel roller rotates under the drive of the bearing, the coating surface 1 continuously contacts the surface to be coated, and the varnish in the cells 10 is absorbed by the surface. Different areas with different ink holding capacities correspond to different amounts of varnish applied to the surface, thus achieving continuous partitioned varnish coating.

[0037] Example 2:

[0038] This embodiment of a two-piece can coating assembly includes a steel roller and a rubber roller 5 that is in close contact with the coating surface 1 of the steel roller. The size of the rubber roller 5 matches the two cans to be coated. The specific structure of the steel roller is as follows: Figure 1-3As shown, the entire structure is a cylinder composed of a polished surface 1 and two end faces 30. The end faces 30 have pre-drilled holes, including bearing holes 32 for inserting bearings, limiting slots 33 for restricting relative rotation of the bearings, and four positioning holes 34 for fixing the bearings. A cavity 31 exists between the polished surface 1 and the end faces 30 to reduce the weight of the steel roller and decrease the pressure on the bearings. Furthermore, the thickness of the bearing holes 32 and the limiting slots 33 within the cavity 31 is greater than the thickness of the end faces 30, forming a thickened portion 35. During use, the bearing passes through the bearing holes 32, and the protrusions on the bearing are engaged within the limiting slots 33. The bearing is then fixed to the positioning holes 34 using positioning screws.

[0039] A ceramic layer 11 with engraved cells 10 is applied to the polished surface 1. To ensure that the amount of varnish remaining in the cells is similar and to minimize the impact of long-term use on the amount of varnish applied, all cells 10 are regular hexagons of the same size, with a "V"-shaped bottom. Figure 6 As shown, from top to bottom, the topcoat 1 is divided into the can head area 2, the middle area 3, and the can tail area 4, with an area ratio of 4:10:5. This area ratio takes into account that the roller 5 is often narrower than the topcoat 1. To ensure the coating effect, the areas of the can head area 2 and the can tail area 4 are increased. The key to achieving different coating amounts in different areas is the difference in cell density. The cell density ratio of the three areas is 9:7:11. Since the can tail area 4 is more susceptible to wear than the can head area 2 during transportation, the cell density of the can tail area 4 is slightly increased.

[0040] The rubber roller 5 is a roller-shaped product made of rubber through vulcanization. Its surface is in close contact with the polished surface 1, and the edge of the rubber roller 5 is within the can head area 2 and the can tail area 4, so that the polished surface 1 can completely cover the surface of the rubber roller 5 during rotation. Through the numerous notches on the end face 30, the bearing can transmit the rotational force to the steel roller through the thickened part 35 during rotation. Then, the positioning hole 34 and the positioning screw cooperate to prevent the steel roller from shifting during rotation, thus forming a structure for stable rotation of the steel roller. When the steel roller rotates, the friction causes the rubber roller 5 to rotate as well. At the same time, the varnish inside the cells 10 is continuously applied to the surface of the rubber roller 5 on the contact surface between the polished surface 1 and the rubber roller 5. Due to the partitioned design of the polished surface 1, the part of the rubber roller 5 corresponding to the can tail area 4 has the most varnish, followed by the parts corresponding to the can head area 2 and the middle area 3. By continuously rotating, three annular coating areas with different amounts of varnish are formed on the rubber roller 5. Then, the two can bodies to be coated are pressed tightly against the rubber roller 5, and different amounts of varnish are applied to the head, middle and tail of the two cans respectively. As the two cans rotate once, the varnish coating is completed. Finally, the can bodies achieve the effect that the tail protrusion has the most varnish, the head protrusion has the second most varnish, and the middle part has the least varnish.

[0041] The embodiments of this specification have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical applications, or technological improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A two-piece non-uniformly distributed steel roller, characterized in that: It includes a gloss surface (1) for applying varnish, the gloss surface (1) is cylindrical, and one end of the gloss surface (1) is sequentially divided into a can head area (2), a can middle area (3) and a can tail area (4). The polished surface (1) is provided with mesh holes (10) of the same size; The mesh density of the head area (2) and tail area (4) is greater than that of the middle area (3).

2. The non-uniformly distributed steel roller for two cans according to claim 1, characterized in that: The ratio of the mesh density of the head area (2), middle area (3) and tail area (4) is 8:7:10 to 9:7:

11.

3. The non-uniformly distributed steel roller for two cans according to claim 1, characterized in that: The area ratio of the head area (2), middle area (3) to tail area (4) is 3:10:4 to 4:10:

5.

4. The non-uniformly distributed steel roller for two cans according to claim 1, characterized in that: The mesh (10) is a regular hexagon.

5. A two-piece non-uniformly distributed steel roller according to claim 1, characterized in that: The polished surface (1) is covered with a ceramic layer (11), and the mesh (10) is disposed on the ceramic layer (11).

6. The non-uniformly distributed steel roller for two cans according to claim 1, characterized in that: It also includes end faces (30) provided at both ends of the glossy surface (1) to support the glossy surface (1), thereby forming a cavity (31) between the end faces (30) and the glossy surface (1).

7. A two-piece non-uniformly distributed steel roller according to claim 6, characterized in that: Both end faces (30) are provided with bearing holes (32) at the center to accommodate bearings, and the bearing holes (32) are provided with limiting slots (33) to fix the bearings.

8. A two-piece non-uniformly distributed steel roller according to claim 7, characterized in that: The end face (30) is provided with a positioning hole (34) for fixing the bearing around the bearing hole (32).

9. A two-piece non-uniformly distributed steel roller according to claim 7, characterized in that: The bearing hole (32) and the limiting slot (33) are provided with a thickened part (35) on the side near the cavity (31).

10. A two-piece can finishing assembly, comprising two non-uniformly distributed steel rollers for cans as described in any one of claims 1-9, characterized in that: It also includes a rubber roller (5) for coating the two cans, the rubber roller (5) being tangential to and in close contact with the polishing surface (1).

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