Barrel body

Abstract

The utility model relates to the field of packaging, in particular to a barrel body. The barrel comprises a barrel body, a barrel opening and a barrel bottom are arranged at the two opposite ends of the barrel body respectively, and a barrel side wall is arranged between the barrel opening and the barrel bottom. The length L of the barrel body ranges from 155 mm to 165 mm, the width W of the barrel body ranges from 105 mm to 115 mm, and the height H of the barrel body ranges from 285 mm to 295 mm. The can side walls comprise the first side wall and the second side wall, the first side wall extends in the width direction of the can body, and the second side wall extends in the length direction of the can body. A first fillet structure is arranged between the first side wall and the barrel bottom, the radius of the first fillet structure is R1, and R1 is equal to 18-22 mm; the first side wall is arranged to be an arc-shaped side wall, the radius of the arc-shaped side wall is R2, and R2 is equal to 240-260 mm. According to the barrel body provided by the utility model, the pressure bearing performance of the barrel body can be improved on the basis of reducing the raw material input.

Description

Technical Field

[0001] The utility model relates to the field of packaging, in particular to a barrel. Background Art

[0002] In modern industry and daily life, barrels, as a fundamental and versatile container, are widely used, from the storage of chemical raw materials to the packaging of food. In the packaging industry in particular, barrels not only fulfill the basic function of containing goods, but also play a key role in protecting them from the external environment and ensuring their safety and stability during transportation and storage.

[0003] The manufacture of packaging barrels primarily relies on polymer materials, with polyethylene (PE) and polypropylene (PP) being the most commonly used raw materials due to their excellent physical properties, chemical stability, and processing capabilities. Polyethylene, with its excellent flexibility and low-temperature resistance, is suitable for barrels that must withstand certain pressures and possess a certain degree of toughness. Polypropylene, with its high heat resistance and hardness, excels in applications requiring higher strength or long-term exposure to high temperatures. Blow molding is a primary method for manufacturing packaging barrels. This process heats the polymer raw material to a molten state, injects it into a mold, and uses high-pressure gas to inflate the melt into the desired barrel shape.

[0004] The pressure-bearing capacity of packaging drums is a key indicator of their quality. During product transportation, loading and unloading, and stacking, the drums must withstand various pressures, including their own weight, pressure from drums above when stacked, and vibration and impact during transportation. Inadequate pressure-bearing capacity can lead to cosmetic defects such as deformation and collapse during stacking, and even cause leakage, seriously impacting the product's presentation in the end market. Therefore, improving the pressure-bearing capacity of packaging drums is crucial for ensuring the safe transportation and storage of goods.

[0005] Currently, the traditional method for improving the pressure-bearing performance of packaging barrels is to increase the amount of raw materials used to increase the minimum wall thickness of the barrel. However, while this method can improve the strength of the barrel to a certain extent, it also brings a series of problems. First, the increase in raw materials directly leads to increased barrel costs, reducing the market competitiveness of the product. Second, the excessive use of raw materials also increases resource consumption, which is not conducive to environmental protection and sustainable development.

[0006] Therefore, how to improve the pressure-bearing performance of the barrel while reducing the input of raw materials has become an important technical problem to be solved by those skilled in the art. Utility Model Content

[0007] The utility model provides a barrel body, which can improve the pressure bearing performance of the barrel body on the basis of reducing raw material input.

[0008] The utility model provides a barrel body, comprising a barrel body, wherein opposite ends of the barrel body are respectively provided with a barrel mouth and a barrel bottom, and a barrel side wall is provided between the barrel mouth and the barrel bottom;

[0009] The barrel body has a length L of 155-165 mm, a width W of 105-115 mm, and a height H of 285-295 mm;

[0010] The barrel sidewall includes a first sidewall and a second sidewall, wherein the first sidewall extends along the width direction of the barrel body, and the second sidewall extends along the length direction of the barrel body;

[0011] A first rounded corner structure is provided between the first side wall and the bottom of the barrel, and the radius of the first rounded corner structure is R1, wherein R1=18-22 mm;

[0012] The first side wall is configured as an arc-shaped side wall, and the radius of the arc-shaped side wall is R2, wherein:

[0013] R2 = 240-260 mm.

[0014] Beneficial effects:

[0015] The barrel body provided by the utility model has specific length, width, and height dimensions. Based on these dimensions, a first rounded corner structure is provided between the first sidewall and the barrel bottom, with a radius R1 of 18-22 mm. The first sidewall is configured as an arc-shaped sidewall, with a radius R2 of 240-260 mm. This configuration helps disperse the pressure when the barrel body is subjected to pressure, avoids stress concentration, and improves the barrel body's pressure-bearing capacity. This can further improve the barrel body's pressure-bearing capacity while reducing raw material input.

[0016] The barrel provided by the utility model also includes:

[0017] A handle, wherein a recessed surface is provided on the first sidewall near the bung opening, a first end of the handle is connected to an end of the recessed surface near the bung opening, and a second end of the handle is connected to an end of the recessed surface away from the bung opening, forming a gripping space between the handle and the recessed surface;

[0018] The concave surface is configured as a curved surface, and a section of the concave surface close to an edge of the second side wall forms an angle a1 with the second side wall, wherein a1 = 101°-120°.

[0019] According to the barrel body provided by the present invention, the handle includes a shoulder and a gripping portion connected to each other, the shoulder is connected to the end of the concave surface close to the barrel mouth, the gripping portion is connected to the end of the concave surface away from the barrel mouth, and the gripping portion is for human hand gripping;

[0020] The included angle between the shoulder and the end face of the barrel mouth is a2, wherein a2 = 22°-30°.

[0021] According to the barrel body provided by the present invention, the surface of the second side wall is a plane, and the second rounded corner structure is provided between the second side wall and the barrel bottom.

[0022] According to the barrel body provided by the present invention, the radius of the second rounded corner structure is equal to the radius of the first rounded corner structure.

[0023] According to the barrel body provided by the present invention, the barrel body is made of polyethylene material, and the barrel body is formed by a blow molding process.

[0024] According to the barrel body provided by the present invention, along the width direction of the barrel body, rounded corner structures are provided between both ends of the recessed surface and the second side wall.

[0025] According to the barrel body provided by the present invention, the surface of the recessed surface is configured as an arc surface convex toward the handle.

[0026] According to the barrel body provided by the present invention, the cross section of the handle is set to be square, and rounded corner structures are provided between each surface.

[0027] According to the barrel body provided by the utility model, the barrel body is a milk packaging barrel. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 This is a schematic diagram of the main structure of the barrel body of an embodiment of the utility model;

[0030] Figure 2 This is a schematic diagram of the top view of the barrel body of an embodiment of the utility model;

[0031] Figure 3 This is a comparison diagram of the barrel wall thickness of Examples 1, 2, 3 and the comparative example of the present utility model;

[0032] Figure 4 This is a comparison chart of the barrel load pressure of Examples 1, 2, 3 and a comparative example of the present invention.

[0033] Description of reference numerals:

[0034] 11. Barrel body; 111. Second side wall; 112. Barrel bottom; 113. Barrel mouth; 114. First chamfered corner structure; 115. Second chamfered corner structure; 116. First side wall; 12. Handle; 121. Shoulder; 122. Grip; 13. Concave surface. DETAILED DESCRIPTION

[0035] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are 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 those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0036] In the prior art, the main approach to improving the pressure-bearing performance of packaging barrels is to increase the amount of raw materials used to increase the minimum wall thickness of the barrel. However, while this approach can improve the strength of the barrel to a certain extent, it also brings a series of problems. First, the increase in raw materials directly leads to increased barrel costs, reducing the market competitiveness of the product. Second, the excessive use of raw materials also increases resource consumption, which is not conducive to environmental protection and sustainable development.

[0037] In view of this, the present embodiment provides a barrel that can be used as a packaging barrel. The barrel provided in this embodiment aims to significantly improve the pressure-bearing performance of the barrel while reducing the input of raw materials through optimized structural design.

[0038] like Figure 1 and Figure 2 As shown, in this embodiment, the barrel body includes a barrel body 11, which is the main part of the barrel body. The barrel body 11 is respectively provided with a barrel mouth 113 and a barrel bottom 112 at its opposite ends, and the barrel mouth 113 and the barrel bottom 112 are connected by the barrel side wall.

[0039] Specifically, the length L of the barrel body 11 is set to 155-165 mm, for example, 155 mm, 160 mm, or 165 mm. The width W is set to 105-115 mm, for example, 105 mm, 110 mm, or 115 mm. The height H is set to 285-295 mm, for example, 285 mm, 290 mm, or 295 mm. The barrel provided in this embodiment can be used as a milk packaging barrel. This size range ensures the barrel's capacity while being easy for users to carry and store.

[0040] The barrel sidewall includes a first sidewall 116 and a second sidewall 111 . The first sidewall 116 extends along the width direction of the barrel body, and the second sidewall 111 extends along the length direction of the barrel body.

[0041] The first sidewall 116 is designed as a curved sidewall with a radius R2 set to 240-260 mm. This configuration helps disperse pressure and avoid stress concentration, thereby improving the pressure-bearing capacity of the barrel. Furthermore, the curved sidewall also gives the barrel a more rounded and aesthetically pleasing appearance.

[0042] In addition, this embodiment provides a first rounded corner structure 114 between the first sidewall 116 and the bottom 112, with a radius R1 set to 18-22 mm. This design not only avoids stress concentration between the first sidewall 116 and the bottom 112, but also further improves the pressure-bearing performance of the barrel.

[0043] In a further embodiment, a second rounded corner structure 115 is provided between the second sidewall 111 and the bottom 112, with a radius equal to that of the first rounded corner structure 114. This arrangement makes the barrel structure more streamlined and aesthetically pleasing, while also avoiding stress concentration between the second sidewall 111 and the bottom 112 and improving the connection strength.

[0044] To facilitate user transport of the barrel, this embodiment features a handle 12 on the first sidewall 116 of the barrel. Handle 12 is located near the barrel opening 113 on the first sidewall 116, specifically on a recessed surface 13. Recessed surface 13 is designed as a curved surface, with the angle a1 between the section of the recessed surface near the edge of the second sidewall 111 and the second sidewall 111 set to 101°-120°. This angle range prevents stress concentration at this location.

[0045] In this embodiment, the handle 12 includes a shoulder portion 121 and a grip portion 122, wherein the shoulder portion 121 is connected to the end of the recessed surface 13 near the barrel opening 113, and the grip portion 122 is connected to the end of the recessed surface 13 away from the barrel opening 113. The grip portion 122 is designed to be gripped by a human hand, ensuring that the user can easily grasp it and it is not easy to slip.

[0046] In this embodiment, the angle a2 between the shoulder 121 and the end surface of the barrel opening 113 is set to 22°-30°. It should be noted that when stacking barrels, the shoulder 121 of the handle 12 is prone to deformation under pressure. In this embodiment, by setting the angle a2 between the shoulder 121 and the end surface of the barrel opening 113 to 22°-30°, the shoulder 121 of the handle 12 is more firmly connected and helps distribute the pressure during stacking.

[0047] In a further embodiment, the cross-section of the handle 12 is designed to be square, with rounded corners between each surface. This design not only enhances the structural strength of the handle 12 but also prevents injuries to the user from sharp corners. Furthermore, the square cross-section makes the handle 12 easier to grip and operate.

[0048] The surface of the recessed surface 13 is configured as a curved arc that convexly projects toward the handle 12. This design not only makes the handle 12 more securely mounted but also enhances the overall aesthetics of the barrel. Furthermore, the curved arc helps disperse pressure, further improving the barrel's pressure-bearing capacity.

[0049] In a further embodiment, the barrel is made of polyethylene. Polyethylene has excellent properties such as lightness, high strength, and corrosion resistance, making it suitable for manufacturing barrels and other container products. Polyethylene also has good processability, allowing it to be easily formed into desired shapes and sizes through processes such as blow molding.

[0050] The barrel is formed through a blow molding process. The blow molding process involves injecting molten plastic into a mold, then using high-pressure gas to inflate the plastic and conform it to the mold's inner walls. Finally, it cools and solidifies into the desired shape and size. Blow molding offers advantages such as high production efficiency, low cost, and the ability to achieve a high degree of product complexity, making it suitable for manufacturing barrels and other container products.

[0051] In this embodiment, when the barrel is under pressure, the curved sidewall of the first sidewall 116 can effectively disperse the pressure and avoid stress concentration. At the same time, the first rounded corner structure 114 and the second rounded corner structure 115 can also play a similar role, further enhancing the pressure-bearing performance of the barrel.

[0052] The barrel's structural design allows it to withstand significant pressure in all directions. The first sidewall 116 and the second sidewall 111 extend perpendicularly to each other, forming a stable structural framework. Furthermore, the angle a2 between the shoulder 121 of the handle 12 and the end surface of the barrel mouth 113 further enhances the barrel's structural stability.

[0053] By optimizing the structural design of the barrel, this embodiment can improve the pressure-bearing performance of the barrel while reducing the input of raw materials. Specifically, the structural design of the barrel reduces unnecessary material usage while maintaining sufficient strength.

[0054] It should be noted that the barrel provided in this embodiment can be used for product packaging and transportation, for example, specifically for packaging and transportation of milk products. Of course, in other embodiments, the barrel can also be used in scenes such as material handling and storage in the industrial field.

[0055] The following content is described in detail with reference to Examples 1, 2, 3 and Comparative Examples.

[0056] Example 1

[0057] The barrel provided in this embodiment includes a barrel body 11 and a handle 12. The barrel body is made of polyethylene and is formed by a blow molding process. The barrel body 11 has a barrel mouth 113 and a barrel bottom 112 at opposite ends, respectively, and a barrel sidewall is provided between the barrel mouth 113 and the barrel bottom 112.

[0058] The barrel sidewalls include a first sidewall 116 and a second sidewall 111. The first sidewall 116 extends along the width of the barrel, while the second sidewall 111 extends along the length of the barrel. A first rounded corner 114 is provided between the first sidewall 116 and the barrel bottom 112. The radius of the first rounded corner 114 is R1 = 18 mm. The first sidewall 116 is configured as an arcuate sidewall with a radius of R2 = 240 mm.

[0059] A recessed surface 13 is provided on the first sidewall 116 near the mouth 113. A first end of the handle 12 is connected to the end of the recessed surface 13 near the mouth 113, and a second end of the handle 12 is connected to the end of the recessed surface 13 away from the mouth 113. A gripping space is formed between the handle 12 and the recessed surface 13. The surface of the recessed surface 13 is configured as a circular curved surface that is convex toward the handle 12. The angle a1 = 101° is formed between the section of the recessed surface 13 near the edge of the second sidewall 111 and the second sidewall 111.

[0060] The handle 12 includes a shoulder 121 and a grip 122. The shoulder 121 is connected to the end of the recessed surface 13 near the barrel opening 113, and the grip 122 is connected to the end of the recessed surface 13 away from the barrel opening 113. The grip 122 is intended for grasping by a hand. The angle between the shoulder 121 and the end surface of the barrel opening 113 is a2 = 22°.

[0061] The second sidewall 111 is flat, and a second rounded corner structure 115 is provided between the second sidewall 111 and the bottom 112. The radius of the second rounded corner structure 115 is equal to the radius of the first rounded corner structure 114. Rounded corner structures are provided between both ends of the recessed surface 13 and the second sidewall 111 along the width of the barrel. The handle 12 has a square cross-section, with rounded corners between each surface.

[0062] Example 2

[0063] The barrel provided in this embodiment includes a barrel body 11 and a handle 12. The barrel body is made of polyethylene and is formed by a blow molding process. The barrel body 11 has a barrel mouth 113 and a barrel bottom 112 at opposite ends, respectively, and a barrel sidewall is provided between the barrel mouth 113 and the barrel bottom 112.

[0064] The barrel sidewalls include a first sidewall 116 and a second sidewall 111. The first sidewall 116 extends along the width of the barrel, while the second sidewall 111 extends along the length of the barrel. A first rounded corner 114 is provided between the first sidewall 116 and the barrel bottom 112. The radius of the first rounded corner 114 is R1 = 20 mm. The first sidewall 116 is configured as an arcuate sidewall with a radius of R2 = 250 mm.

[0065] A recessed surface 13 is provided on the first sidewall 116 near the mouth 113. A first end of the handle 12 is connected to the end of the recessed surface 13 near the mouth 113, and a second end of the handle 12 is connected to the end of the recessed surface 13 away from the mouth 113. A gripping space is formed between the handle 12 and the recessed surface 13. The surface of the recessed surface 13 is configured as a circular curved surface that convexly projects toward the handle 12. The section of the recessed surface 13 near the edge of the second sidewall 111 forms an angle a1 = 110° with the second sidewall 111.

[0066] The handle 12 includes a shoulder 121 and a grip 122. The shoulder 121 is connected to the end of the recessed surface 13 near the barrel opening 113, and the grip 122 is connected to the end of the recessed surface 13 away from the barrel opening 113. The grip 122 is intended for grasping by a hand. The angle between the shoulder 121 and the end surface of the barrel opening 113 is a2 = 26°.

[0067] The second sidewall 111 is flat, and a second rounded corner structure 115 is provided between the second sidewall 111 and the bottom 112. The radius of the second rounded corner structure 115 is equal to the radius of the first rounded corner structure 114. Rounded corner structures are provided between both ends of the recessed surface 13 and the second sidewall 111 along the width of the barrel. The handle 12 has a square cross-section, with rounded corners between each surface.

[0068] Example 3

[0069] The barrel provided in this embodiment includes a barrel body 11 and a handle 12. The barrel body is made of polyethylene and is formed by a blow molding process. The barrel body 11 has a barrel mouth 113 and a barrel bottom 112 at opposite ends, respectively, and a barrel sidewall is provided between the barrel mouth 113 and the barrel bottom 112.

[0070] The barrel sidewalls include a first sidewall 116 and a second sidewall 111. The first sidewall 116 extends along the width of the barrel, while the second sidewall 111 extends along the length of the barrel. A first rounded corner 114 is provided between the first sidewall 116 and the barrel bottom 112. The radius of the first rounded corner 114 is R1 = 22 mm. The first sidewall 116 is configured as an arcuate sidewall with a radius of R2 = 260 mm.

[0071] A recessed surface 13 is provided on the first sidewall 116 near the mouth 113. A first end of the handle 12 is connected to the end of the recessed surface 13 near the mouth 113, and a second end of the handle 12 is connected to the end of the recessed surface 13 away from the mouth 113. A gripping space is formed between the handle 12 and the recessed surface 13. The surface of the recessed surface 13 is configured as a circular curved surface that convexly projects toward the handle 12. The section of the recessed surface 13 near the edge of the second sidewall 111 forms an angle a1 = 120° with the second sidewall 111.

[0072] The handle 12 includes a shoulder 121 and a grip 122. The shoulder 121 is connected to the end of the recessed surface 13 near the barrel opening 113, and the grip 122 is connected to the end of the recessed surface 13 away from the barrel opening 113. The grip 122 is intended to be grasped by a hand. The angle between the shoulder 121 and the end surface of the barrel opening 113 is a2 = 30°.

[0073] The second sidewall 111 is flat, and a second rounded corner structure 115 is provided between the second sidewall 111 and the bottom 112. The radius of the second rounded corner structure 115 is equal to the radius of the first rounded corner structure 114. Rounded corner structures are provided between both ends of the recessed surface 13 and the second sidewall 111 along the width of the barrel. The handle 12 has a square cross-section, with rounded corners between each surface.

[0074] Comparative Example

[0075] A barrel body in the comparative example has a barrel body 11 whose length, width, and height dimensions are substantially the same as those of the barrel body 11 provided in this embodiment, and the barrel body 11 in the related art is provided with a barrel mouth 113 and a barrel bottom 112 at opposite ends, respectively, and a barrel side wall is provided between the barrel mouth 113 and the barrel bottom 112. The barrel side wall includes a first side wall 116 and a second side wall 111, the first side wall 116 extending along the width direction of the barrel body, and the second side wall 111 extending along the length direction of the barrel body. A first chamfered corner structure 114 is provided between the first side wall 116 and the barrel bottom 112, and the radius of the first chamfered corner structure 114 is R1 = 15 mm. The first side wall 116 is provided as an arcuate side wall, and the radius of the arcuate side wall is R2 = 400 mm.

[0076] In this comparative example, a recessed surface 13 is provided on the first side wall 116 of the barrel body 11 near the barrel opening 113. The first end of the handle 12 is connected to the end of the recessed surface 13 near the barrel opening 113, and the second end of the handle 12 is connected to the end of the recessed surface 13 away from the barrel opening 113. A gripping space is formed between the handle 12 and the recessed surface 13. The handle 12 includes a shoulder 121 and a gripping portion 122. The shoulder 121 is connected to the end of the recessed surface 13 near the barrel opening 113, and the gripping portion 122 is connected to the end of the recessed surface 13 away from the barrel opening 113. The gripping portion 122 is for a person to hold. The angle between the shoulder 121 and the end surface of the barrel opening 113 is a2 = 19°.

[0077] Under the condition of the same gram weight and equal length, width and height, 5 barrels in the comparative example and 5 barrels in Examples 1, 2 and 3 were taken, and the wall thickness of the samples was measured multiple times using a wall thickness detector. The minimum wall thickness was selected and recorded. The comparative data are shown as follows: Figure 3 As shown in the figure, the minimum wall thickness of the comparative example is 0.40, the minimum wall thickness of Example 1 is 0.45, the minimum wall thickness of Example 2 is 0.50, and the minimum wall thickness of Example 3 is 0.48. The wall thickness of the comparative example is the smallest, while the minimum wall thickness values ​​of Examples 1, 2, and 3 are all higher than that of the comparative example. It can be seen that the barrel provided by this application has a thicker wall under the same gram weight and size, which helps it withstand a larger load pressure.

[0078] Furthermore, under the condition of the same gram weight and equal length, width and height, 5 barrels in the comparative example and 5 barrels in Examples 1, 2 and 3 were taken, and the samples were placed vertically on the pressure testing machine. Pressure was applied at a constant relative speed of 10 mm / min±3 mm / min. The maximum load pressure of each group of samples was recorded for the first time, and the average value was taken. The load pressure of each group of empty barrels and the load pressure of full barrels were compared. The comparative data are shown as follows: Figure 4As shown in the figure, the vertical load pressure of the empty barrel in the comparative example is 420, and the full barrel load pressure is 450; the empty barrel load pressure of Example 1 is 430, and the full barrel load pressure is 500; the empty barrel load pressure of Example 2 is 450, and the full barrel load pressure is 600; and the empty barrel load pressure of Example 3 is 440, and the full barrel load pressure is 525. The vertical load pressure value of the comparative example is the smallest, while the vertical load pressure values ​​of Examples 1, 2, and 3 are all higher than those of the comparative example. This shows that the barrel body provided by this application can withstand a higher load pressure under the same gram weight and size.

[0079] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. A barrel, characterized in that: The barrel body (11) comprises a barrel mouth (113) and a barrel bottom (112) respectively provided at opposite ends of the barrel body (11), and a barrel side wall is provided between the barrel mouth (113) and the barrel bottom (112); The barrel body (11) has a length L=155-165 mm, a width W=105-115 mm, and a height H=285-295 mm; The barrel side wall comprises a first side wall (116) and a second side wall (111), wherein the first side wall (116) extends along the width direction of the barrel body, and the second side wall (111) extends along the length direction of the barrel body; A first rounded corner structure (114) is provided between the first side wall (116) and the barrel bottom (112), and the radius of the first rounded corner structure (114) is R1, wherein R1=18-22 mm; The first side wall (116) is configured as an arc-shaped side wall, and the radius of the arc-shaped side wall is R2, wherein R2=240-260 mm.

2. The barrel according to claim 1, characterized in that: Also includes: A handle (12), wherein a recessed surface (13) is provided at a position of the first side wall (116) close to the barrel opening (113), a first end of the handle (12) is connected to an end of the recessed surface (13) close to the barrel opening (113), and a second end of the handle (12) is connected to an end of the recessed surface (13) away from the barrel opening (113), forming a gripping space between the handle (12) and the recessed surface (13); The recessed surface (13) is configured as a curved surface, and a section of the recessed surface (13) close to an edge of the second side wall (111) forms an angle a1 with the second side wall (111), wherein a1 = 101°-120°.

3. The barrel according to claim 2, characterized in that: The handle (12) comprises a shoulder (121) and a gripping portion (122) connected to each other, wherein the shoulder (121) is connected to an end of the recessed surface (13) close to the barrel opening (113), and the gripping portion (122) is connected to an end of the recessed surface (13) away from the barrel opening (113), and the gripping portion (122) is for a person to hold; The included angle between the shoulder (121) and the end surface of the barrel mouth (113) is a2, wherein a2 = 22°-30°.

4. The barrel according to claim 1, characterized in that: The surface of the second side wall (111) is a plane, and a second rounded corner structure (115) is provided between the second side wall (111) and the barrel bottom (112).

5. The barrel according to claim 4, characterized in that: The radius of the second rounded corner structure (115) is equal to the radius of the first rounded corner structure (114).

6. The barrel according to any one of claims 1 to 4, characterized in that: The barrel body is made of polyethylene and is formed by a blow molding process.

7. The barrel according to claim 2, characterized in that: Along the width direction of the barrel body, rounded corner structures are provided between both ends of the recessed surface (13) and the second side wall (111).

8. The barrel according to claim 2, characterized in that: The surface of the recessed surface (13) is configured as a circular arc surface convex toward the handle (12).

9. The barrel according to claim 3, characterized in that: The cross section of the handle (12) is arranged to be square, and a rounded corner structure is arranged between each surface.

10. The barrel according to claim 1, characterized in that: The barrel body is a milk packaging barrel.

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