A square can for improving the quality of can sealing

Abstract

The present invention discloses a square can that is beneficial to improving the can sealing quality. An expanded opening is formed by expanding outward at the can mouth. Straight-edge expanded openings with the same depth are formed above the long-side can wall and the short-side can wall, and an arc-shaped expanded opening is formed above the arc-shaped can wall. The maximum depth of the arc-shaped expanded opening is greater than the depth of the straight-edge expanded opening. An outward-turned edge is provided at the top of the expanded opening. Among them, straight outward-turned edges with the same width are provided above the long-side can wall and the short-side can wall, and an arc-shaped outward-turned edge is provided above the arc-shaped can wall. The minimum width of the arc-shaped outward-turned edge is less than the width of the straight outward-turned edge. The square can of the present invention can significantly improve the double-seaming quality of high-draw can lids, thereby improving the safety performance and storage period of the packaged contents, and has high practical value.

Description

Technical Field

[0001] The present invention belongs to the technical field of packaging containers, and particularly relates to a square can that is beneficial to improving the can sealing quality. Background Art

[0002] The easy - opening pop - top can products have become increasingly popular in the market. The good sealing performance of metal packaging is a necessary condition for ensuring the long - term storage of the contents. Good can lid sealing quality is a key prerequisite for ensuring the sealing performance.

[0003] The sealing of the easy - opening can lid is achieved through double - seam sealing. The hook of the easy - opening lid and the hook of the easy - opening can body are gradually rolled in, and finally a sealing effect is formed. When the metal material is rolled and formed, due to the huge deformation pressure and extrusion shrinkage during rolling, there will inevitably be problems of instability and wrinkling and local material extrusion and stacking, resulting in a decrease in the sealing effect of the seal, affecting the safety performance and storage period of the packaged contents. For square easy - opening can lids, especially those with high stretch and small diameter, the degree of deformation of the can body is large. During double - seam sealing, the curvature changes greatly at the transition between the straight section and the arc angle. Therefore, there is a problem of material shrinkage and deformation in the fan - shaped area at the R position, and it is very easy to have can - sealing quality problems caused by material stacking. Therefore, designing a high - stretch can with excellent structure is beneficial to improving the double - seam sealing quality of the high - stretch can lid, thereby improving the safety performance and storage period of the packaged contents. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem that the existing easy - opening cans have poor sealing due to instability and wrinkling and local material extrusion and stacking during double - seam sealing, affecting the safety performance and storage period of the packaged contents. The present invention provides a square can that is beneficial to improving the can - sealing quality, which can significantly improve the double - seam sealing quality of the high - stretch can lid, thereby improving the safety performance and storage period of the packaged contents.

[0005] The technical solution adopted by the present invention to solve the above technical problems is a square can that is beneficial to improving the can sealing quality, including a can body. The can body includes a can bottom and a can body integrally formed. The upper end of the can body is open to form a can mouth. Both the can bottom and the can mouth are rectangular. The main body of the can body is a straight wall structure. The height of the can body is greater than the width of the main body of the can body. The long side wall of the can body and the short side wall of the can body are transitionally connected through an arc-shaped can wall. An expanded mouth is formed by expanding outward at the can mouth. The cross-sectional area of the expanded mouth is larger than the cross-sectional area of the main body of the can body. Among them, straight-edge expanded mouths with the same depth are formed above the long side wall and the short side wall, and an arc-shaped expanded mouth is formed above the arc-shaped can wall. The maximum depth of the arc-shaped expanded mouth is greater than the depth of the straight-edge expanded mouth, and the depth of the arc-shaped expanded mouth linearly decreases from the center of the arc-shaped expanded mouth to both sides and is smoothly connected to the straight-edge expanded mouths on both sides. An outward-turned edge is provided at the top of the expanded mouth. Among them, straight outward-turned edges with the same width are provided above the long side wall and the short side wall, and an arc-shaped outward-turned edge is provided above the arc-shaped can wall. The minimum width of the arc-shaped outward-turned edge is smaller than the width of the straight outward-turned edge, and the width of the arc-shaped outward-turned edge linearly increases from the center of the arc-shaped outward-turned edge to both sides and is smoothly connected to the straight outward-turned edges on both sides. The can body of the present invention is provided with an expanded mouth, and the size at the expanded mouth is larger than the size of the main body of the can body, which is beneficial to pouring out the contents of the can body. The depth of the straight-edge expanded mouth on the can body is H1, and the maximum depth in the middle (center line) area of the arc-shaped wall (R corner) is H2, and H1 < H2. Among them, a gradual transition and deformation occur between H1 and H2, gradually increasing from H1 to H2, that is, the total depth H3 of the expanded mouth at the straight-edge expanded mouth and the arc-shaped expanded mouth is equal, and the lower edge line of the expanded mouth is on the same horizontal line. This structure is beneficial to cooperating with an easy-open lid during sealing, providing space for the deformation of the easy-open lid during the double-seaming process, preventing extrusion deformation, and can significantly improve the can sealing quality. In addition, an outward-turned edge is provided at the top of the expanded mouth of the can body. The width of the straight outward-turned edge above the long side wall and the short side wall is W1, and the minimum width of the arc-shaped outward-turned edge at the center (center line) of the arc-shaped wall (R corner) is W2, and W1 > W2. Among them, a smooth transition occurs between W1 and W2. In this way, under the condition of equal mouth edge length (that is, the length of the can mouth edge), the inner surface areas at the arc-shaped expanded mouth and the straight-edge expanded mouth are basically close. During seaming, due to the shrinkage deformation and stacking increase of the arc-shaped (sector-shaped) area during sealing, the height consistency during sealing is realized, thereby greatly improving the sealing quality.

[0006] Preferably, the cross-sectional area of the expanded mouth of the can body is 1.1 - 1.15 times the cross-sectional area of the main body of the can body. The depth of the straight-edge expanded mouth is 5 - 8% of the height of the can body. The maximum depth of the arc-shaped expanded mouth is 1.2 - 1.5 times the depth of the straight-edge expanded mouth. The can mouth of the present invention significantly expands outward. In this way, when an easy-open lid is used to seal the can mouth, the cross-section of the can body below the can mouth is equivalent to the size of the tear opening of the easy-open lid, which is convenient for the smooth pouring out of the whole food in the can.

[0007] Preferably, the width of the straight outward flange is 1.1 - 1.3 times the width of the arc-shaped outward flange.

[0008] Preferably, convex edges protruding downward from the plane of the bottom of the can are provided on both sides of the long side of the bottom of the can. The height of the convex edge protruding from the plane of the bottom of the can is greater than the thickness of the pull ring of the easy-open lid. Notches are provided at both ends of the convex edge in the length direction of the bottom of the can, and a pull-ring avoidance surface is formed at the notch. The pull-ring avoidance surface is on the same plane as the plane of the bottom of the can. The convex edge protruding from the plane of the bottom of the can is used to raise the plane of the bottom of the can, so that the pull ring on the easy-open lid will not touch the plane of the bottom of the can when the canned food products are stacked, avoiding damage to the bottom of the can by the pull ring. The overall area of the pull-ring avoidance surface of the present invention is relatively large, which can meet the avoidance requirements of various forms of pull rings.

[0009] Preferably, a plurality of long-side reinforcing ribs are provided on the long-side can wall of the can body. The cross-section of the long-side reinforcing rib is arc-shaped and is evenly spaced on the long-side of the can body. The length direction of the long-side reinforcing rib is in the height direction of the can body. Providing a plurality of long-side reinforcing ribs on the long-side can wall is beneficial to improving the structural strength of the long-side can wall.

[0010] Preferably, short-side reinforcing ribs are provided on the short-side can wall. The cross-section of the short-side reinforcing rib is arc-shaped, and the length direction of the short-side reinforcing rib is in the height direction of the can body. Providing short-side reinforcing ribs on the short-side can wall is beneficial to improving the structural strength of the short-side can wall.

[0011] Preferably, the long-side reinforcing rib and the short-side reinforcing rib have the same length. The lower ends of the long-side reinforcing rib and the short-side reinforcing rib both extend to the convex edge of the bottom of the can. The lower ends of the long-side reinforcing rib and the short-side reinforcing rib intersect with the convex edge to form a recessed part. The upper ends of the long-side reinforcing rib and the short-side reinforcing rib are located below the flared part of the can body main body and are smoothly connected to the can body main body through a concave surface structure. The lower ends of the long-side reinforcing rib and the short-side reinforcing rib intersect with the convex edge to form a recessed part, which is beneficial to improving the structural strength of the convex edge.

[0012] Preferably, the can body main body is a symmetric structure. The height of the can body main body is 1.15 - 1.35 times the width of the can body main body, and the length of the can body main body is 1.8 - 2.2 times the width of the can body main body. The symmetrically structured can body is convenient for processing and for nesting empty cans, and is convenient for packaging and transportation.

[0013] Preferably, the inner surface area and length of the arc-shaped flared part of the can body are equal to the inner surface area of the straight-edge flared section with the same length as the arc-shaped flared edge length. Under the condition of the same edge length of the flared part, the inner surface area of the arc-shaped flared part is equal to the inner surface area of the straight-edge flared part. When performing the curling seal, due to the shrinkage deformation and stacking increase of the arc-shaped (sector-shaped) area during sealing, the height consistency during sealing is achieved, thereby further improving the sealing quality.

[0014] The beneficial effects of the present invention are as follows: It effectively solves the problems existing in the prior art that when an easy-open can is sealed by double-seam sealing, there are instability and wrinkling, as well as extrusion and stacking of local materials, resulting in poor sealing, which affects the safety performance and storage period of the packaged contents. The square can of the present invention can significantly improve the double-seam sealing quality of a high-tensile can lid, thereby improving the safety performance and storage period of the packaged contents, and has high practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 FIG. is a schematic perspective view of a square can of the present invention;

[0016] Figure 2 FIG. is a bottom view of a square can of the present invention;

[0017] Figure 3 FIG. is Figure 2 a schematic top view structure diagram of;

[0018] Figure 4 FIG. is Figure 3 a partial enlarged view of part A in;

[0019] Figure 5 FIG. is Figure 2 a schematic structure diagram in the direction of B-B of.

[0020] In the figure: 1. can mouth, 2. can body main body, 3. long side side wall of the can, 4. short side side wall of the can, 5. arc-shaped side wall of the can, 6. flared opening, 7. straight-edge flared opening, 8. arc-shaped flared opening, 9. straight outer turned edge, 10. arc-shaped outer turned edge, 11. can bottom plane, 12. convex edge, 13. notch, 14. long side reinforcing rib, 15. short side reinforcing rib, 16. recessed part, 17. concave surface structure, H. height of the can body, H1. depth of the straight-edge flared opening, H2. maximum depth of the arc-shaped flared opening, H3. total depth of the flared opening, W1. width of the straight outer turned edge, W2. minimum width of the arc-shaped outer turned edge. DETAILED DESCRIPTION OF THE INVENTION

[0021] The following is a further description of the specific implementation manner of the technical solution of the present invention through examples in combination with the drawings.

[0022] Example 1

[0023] In Example 1 as shown in Figure 1 Figure 2 , a square can beneficial to improving the can sealing quality includes a can body. The can body includes a can bottom and a can body integrally formed. The upper end of the can body is open to form a can mouth. The can bottom and the can mouth 1 are both rectangular. The can body main body 2 has a straight wall structure. The height H of the can body is greater than the width of the can body main body (see Figure 3), the long-side wall 3 of the can body is transitionally connected to the short-side wall 4 of the can body through an arc-shaped wall 5; an outwardly expanding flared opening 6 is formed at the can mouth, and the cross-sectional area of the flared opening is larger than the cross-sectional area of the main body of the can body. Among them, straight-edge flared openings 7 with the same depth are formed above the long-side wall and the short-side wall, an arc-shaped flared opening 8 is formed above the arc-shaped wall, the maximum depth H2 of the arc-shaped flared opening is greater than the depth H1 of the straight-edge flared opening, and the depth of the arc-shaped flared opening linearly decreases from the center of the arc-shaped flared opening to both sides and is smoothly connected to the straight-edge flared openings on both sides, that is, the total depth H3 of the flared opening at the straight-edge flared opening and the arc-shaped flared opening is equal, and the lower edge line of the flared opening is on the same horizontal line; an outward-turned edge is provided at the top of the flared opening. Among them, straight outward-turned edges 9 with the same width are provided above the long-side wall and the short-side wall, and an arc-shaped outward-turned edge 10 is provided above the arc-shaped wall. The minimum width W2 of the arc-shaped outward-turned edge is less than the width W1 of the straight outward-turned edge, and the width of the arc-shaped outward-turned edge linearly increases from the center of the arc-shaped outward-turned edge to both sides and is smoothly connected to the straight outward-turned edges on both sides.

[0024] The main body of the can body in this embodiment is a symmetric structure. The height of the main body of the can body is 1.25 times the width of the main body of the can body, and the length of the main body of the can body is 2 times the width of the main body of the can body; the cross-sectional area of the flared part of the can body is 1.12 times the cross-sectional area of the main body of the can body, the depth of the straight-edge flared opening is 6% of the height of the can body, and the maximum depth of the arc-shaped flared opening is 1.3 times the depth of the straight-edge flared opening; the width of the straight outward-turned edge is 1.2 times the width of the arc-shaped outward-turned edge. After adopting the above parameters, the inner surface area of the arc-shaped flared part of the can body and the inner surface area of the straight-edge flared section with the same length as the length of the arc-shaped flared edge are basically equal.

[0025] In this embodiment, convex edges 12 protruding downward from the bottom plane 11 of the can are provided on both long-side edges of the can bottom. The height of the convex edge protruding from the bottom plane of the can is greater than the thickness of the pull ring of the easy-open lid. Notches 13 are provided at both ends of the convex edge in the length direction of the can bottom, and a pull-ring avoidance surface is formed at the notch. The pull-ring avoidance surface is on the same plane as the bottom plane of the can. A plurality of long-side reinforcing ribs 14 are provided on the long-side wall of the can body. The cross-section of the long-side reinforcing rib is arc-shaped and is evenly spaced on the long-side of the can body. The length direction of the long-side reinforcing rib is in the height direction of the can body. Short-side reinforcing ribs 15 are provided on the short-side wall of the can body. The cross-section of the short-side reinforcing rib is arc-shaped, and the length direction of the short-side reinforcing rib is in the height direction of the can body. The long-side reinforcing rib and the short-side reinforcing rib have the same length. The lower ends of the long-side reinforcing rib and the short-side reinforcing rib both extend to the convex edge of the can bottom. The lower ends of the long-side reinforcing rib and the short-side reinforcing rib intersect with the convex edge to form a recessed part 16. The upper ends of the long-side reinforcing rib and the short-side reinforcing rib are located below the flared part of the main body of the can body and are smoothly connected to the main body of the can body through a concave surface structure 17.

[0026] As Figure 4 Figure 5As shown in the figure, the can body of the present invention has a flared opening, and the size of the flared opening is larger than that of the main body of the can body, which is beneficial to pouring out the contents of the can. The depth of the straight-edge flared opening on the can body is H1, and the maximum depth of the middle (center line) area of the arc wall (R corner) is H2, and H1 < H2; the transition between H1 and H2 is gradual, increasing from H1 to H2 gradually, that is, the total depth H3 of the flared opening at the straight-edge flared opening and the arc flared opening is equal, and the lower edge line of the flared opening is on the same horizontal line; this structure is beneficial to cooperate with the easy-open lid during sealing, provides space for the deformation of the easy-open lid during the double-seaming process, prevents extrusion deformation, and can significantly improve the can sealing quality. In addition, the top of the flared opening of the can body is provided with an outward-turned edge. The width of the straight outward-turned edge above the long-side can wall and the short-side can wall is W1, and the minimum width of the arc outward-turned edge at the center (center line) of the arc wall (R corner) is W2, and W1 > W2. The transition between W1 and W2 is smooth. In this way, under the condition of equal mouth edge length (that is, the length of the can mouth edge), the inner surface areas of the arc flared opening and the straight-edge flared opening are basically close. During seaming, due to the shrinkage deformation and stacking increase of the arc (sector) area during sealing, the height consistency during sealing is achieved, thus greatly improving the sealing quality and enhancing the market competitiveness of the can body product.

[0027] In addition to the above embodiments, within the scope disclosed in the claims and the specification of the present invention, the technical features or technical data of the present invention can be reselected and combined to form new embodiments, which can be achieved by those skilled in the art without creative labor. Therefore, these embodiments not detailedly described in the present invention should also be regarded as specific embodiments of the present invention and within the protection scope of the present invention.

Claims

1. A square can that is beneficial to improving the can-sealing quality, comprising a can body. The can body includes a can bottom and a can body that are integrally formed. The upper end of the can body is open to form a can mouth. Its characteristics are that, The bottom and the mouth (1) of the can are both rectangular. The main body (2) of the can body has a straight-wall structure. The height (H) of the can body is greater than the width of the main body of the can body. The long-side wall (3) of the can body and the short-side wall (4) of the can body are transitionally connected by an arc-shaped wall (5). An outward-expanded mouth (6) is formed at the mouth of the can. The cross-sectional area of the expanded mouth is greater than the cross-sectional area of the main body of the can body. Among them, a straight-edge expanded mouth (7) with the same depth is formed above the long-side wall and the short-side wall. An arc-shaped expanded mouth (8) is formed above the arc-shaped wall. The maximum depth (H2) of the arc-shaped expanded mouth is greater than the depth (H1) of the straight-edge expanded mouth, and the depth of the arc-shaped expanded mouth linearly decreases from the center of the arc-shaped expanded mouth to both sides and is smoothly connected to the straight-edge expanded mouths on both sides. The top of the expanded mouth is provided with an outward-turned edge. Among them, the long-side wall and the short-side wall are provided with straight outward-turned edges (9) with the same width above. The arc-shaped wall is provided with an arc-shaped outward-turned edge (10). The minimum width (W2) of the arc-shaped outward-turned edge is less than the width (W1) of the straight outward-turned edge, and the width of the arc-shaped outward-turned edge linearly increases from the center of the arc-shaped outward-turned edge to both sides and is smoothly connected to the straight outward-turned edges on both sides.

2. The square can which is beneficial to improving the can sealing quality according to claim 1, is characterized in that, The cross-sectional area of the expanded part of the can body is 1.1 - 1.15 times that of the cross-sectional area of the main body of the can body. The depth of the straight-edge expanded mouth is 5 - 8% of the height of the can body. The maximum depth of the arc-shaped expanded mouth is 1.2 - 1.5 times the depth of the straight-edge expanded mouth.

3. The square can that is beneficial to improving the can sealing quality according to claim 1, wherein The width of the straight outward-turned edge is 1.1 - 1.3 times the width of the arc-shaped outward-turned edge.

4. The square can which is beneficial to improving the can sealing quality according to claim 1, characterized in that, Convex edges (12) protruding downward from the plane of the bottom of the can (11) are provided on both edges of the long side of the bottom of the can. The height of the convex edge protruding from the plane of the bottom of the can is greater than the thickness of the pull ring of the easy-open lid. Notches (13) are provided at both ends of the convex edge in the length direction of the bottom of the can. A pull-ring avoidance surface is formed at the notch. The pull-ring avoidance surface is on the same plane as the plane of the bottom of the can.

5. The square can which is beneficial to improving the can sealing quality according to claim 1, characterized in that, A plurality of long-side reinforcing ribs (14) are provided on the long-side wall of the can body. The cross-section of the long-side reinforcing rib is arc-shaped and is evenly spaced on the long side of the can body. The length direction of the long-side reinforcing rib is in the height direction of the can body.

6. The square can according to claim 1, which is beneficial to improving the quality of can sealing, is characterized in that, Short-side reinforcing ribs (15) are provided on the short-side wall of the can body. The cross-section of the short-side reinforcing rib is arc-shaped. The length direction of the short-side reinforcing rib is in the height direction of the can body.

7. The square can which is beneficial to improving the can sealing quality according to claim 1, characterized in that, The long-side reinforcing rib and the short-side reinforcing rib have the same length. The lower ends of the long-side reinforcing rib and the short-side reinforcing rib both extend to the convex edge of the bottom of the can. The lower ends of the long-side reinforcing rib and the short-side reinforcing rib intersect with the convex edge to form a recessed part (16). The upper ends of the long-side reinforcing rib and the short-side reinforcing rib are located below the expanded mouth of the main body of the can body and are smoothly connected to the main body of the can body through a concave surface structure (17).

8. The square can which is beneficial to improving the can sealing quality according to any one of claims 1-7, characterized in that, The main body of the can body is a symmetric structure. The height of the main body of the can body is 1.15 - 1.35 times the width of the main body of the can body. The length of the main body of the can body is 1.8 - 2.2 times the width of the main body of the can body.

9. The square can for improving the can sealing quality according to any one of claims 1-7, characterized in that, The inner surface area and length of the part of the can body with the arc-shaped expanded mouth are equal to the inner surface area of the straight-edge expanded mouth section with the same length as the length of the edge of the arc-shaped expanded mouth.

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