Packaging method for annular product

Abstract

The invention provides an annular product packaging method which comprises the following steps: (1) carrying out semi-vacuum sealed packaging on an annular product to obtain a first packaged product; (2) first anti-collision cotton, the first packaging product obtained in the step (1) and an anti-collision cotton plate are sequentially placed in a hollow box, and a second packaging product is obtained; and the density of the first anti-collision cotton is 32-36 kg / m < 3 >. By adopting a specific packaging process and combining with a specific packaging material, the problems of collision, extrusion deformation and the like cannot occur in the transportation process or the carrying process of the ring-shaped product, and the stability of the quality of the product in the transportation process or the carrying process is facilitated.

Description

Technical Field

[0001] The invention belongs to the technical field of product packaging and relates to a packaging method for annular products. Background Art

[0002] Packaging is a performance feature that can effectively contain, protect, store, sell, and provide assurance and convenience for consumption of products, and bring material benefits to society. One of the purposes of packaging is to use an economical and effective way to deliver products from the place of production to the user in good condition. In order to prevent damage to products during circulation and distribution, packaging must have appropriate protection to resist vibration and impact from transportation and handling.

[0003] CN118701432A discloses a vacuum leakage and lossless rebound retail packaging method, comprising: packing each product in an independent vacuum bag, and then vacuuming and compressing the package; stacking a fixed number of products together as a group and restraining and reinforcing them with restraints; punching holes in the vacuum bag to leak air so that air can enter the independent vacuum bag of each product; packing one or more groups of products and transporting them; after the boxed products arrive at the customer's warehouse or retail store, the restraints are removed and the products packed in the independent vacuum bags gradually become fluffy again.

[0004] CN114506501A discloses a vacuum packaging method, comprising: placing a product to be packaged on a lower roll film by a feeding mechanism; pulling the lower roll film, an upper roll film located above the lower roll film and the product to be packaged along a specific direction by a film pulling mechanism; fusing a portion of the lower roll film and a portion of the upper roll film by a heat sealing mechanism to form a fusion band surrounding the product to be packaged; cutting a receiving bag with an opening formed by a plurality of fusion bands surrounding the product to be packaged from the lower roll film and the upper roll film by a cutting mechanism; and extracting the air in the receiving bag and sealing the opening of the receiving bag by a vacuuming and sealing mechanism.

[0005] At present, when vacuum packaging products, most of them adopt full vacuuming, which can easily cause deformation of low-hardness products, and there are no corresponding anti-deformation measures, resulting in deformation and damage of products during transportation or handling. Summary of the invention

[0006] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a packaging method for ring-shaped products. By adopting a specific packaging process and combining specific packaging materials, the ring-shaped products will not have problems such as collision and deformation during transportation or handling, which is conducive to the stability of the quality of the products during transportation or handling.

[0007] In order to achieve the purpose of the invention, the present invention adopts the following technical solutions:

[0008] The present invention provides a packaging method for a ring-shaped product, the packaging method comprising the following steps:

[0009] (1) performing semi-vacuum sealing packaging on the ring-shaped product to obtain a first packaged product;

[0010] (2) placing the first anti-collision cotton, the first packaging product obtained in step (1), and the anti-collision cotton plate in the hollow box in sequence to obtain a second packaging product;

[0011] The density of the first anti-collision cotton is 32-36kg / m 3 , for example, it can be 32kg / m 3 、32.5kg / m 3 、33kg / m 3 、33.5kg / m 3 、34kg / m 3 、34.5kg / m 3 、35kg / m 3 、35.5kg / m 3 or 36kg / m 3 The above values ​​are not limited to the above values, and other values ​​not listed in the above values ​​are also applicable.

[0012] The packaging method provided by the present invention, by adopting a specific packaging process and combining specific packaging materials, ensures that the ring-shaped product will not have problems such as collision, extrusion deformation, etc. during transportation or handling, which is beneficial to the stability of the quality of the product during transportation or handling.

[0013] It is worth mentioning that the ring-shaped product is first semi-vacuum sealed and packaged, and then anti-collision cotton materials with different density ranges are placed on the upper and lower surfaces of the first packaged product respectively, to provide differentiated protection for different parts of the product. This can not only provide stronger cushioning protection and better support and stability, but also avoid deformation of the ring-shaped product during transportation or handling, and can also reduce the overall packaging cost.

[0014] As a preferred technical solution of the present invention, the material of the annular product in step (1) includes aluminum.

[0015] In the present invention, since the hardness of aluminum material is relatively low and the product is hollow in the middle, it is very easy to deform during transportation. Therefore, the inventor improves the product packaging method in the prior art to increase the safety factor of aluminum ring-shaped products during transportation.

[0016] As a preferred technical solution of the present invention, in step (1), a plastic film is used to perform semi-vacuum sealing packaging on the annular product.

[0017] It should be noted that the present invention does not specifically limit the material of the plastic film, and those skilled in the art can select it according to actual needs. In addition, since the plastic film is relatively thin, its thickness can be ignored.

[0018] Preferably, the vacuum degree in the first packaged product in step (1) is -0.06 to -0.02 MPa, for example, it can be -0.06 MPa, -0.05 MPa, -0.04 MPa, -0.03 MPa or -0.02 MPa, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0019] It is worth mentioning that by controlling the vacuum range in the packaging bag, the product can be effectively protected from external contamination and damage, and the product can be protected from extrusion and pressure change to avoid affecting performance.

[0020] As a preferred technical solution of the present invention, in step (2), a second anti-collision cotton matching the size of the first packaged product is pre-installed in the side of the hollow box.

[0021] In the present invention, the size of the assembled second anti-collision cotton and the size of the gap around the hollow box are exactly matched to ensure that the second anti-collision cotton and the hollow box fit perfectly and avoid relative movement of the annular product in the hollow box during transportation.

[0022] Preferably, the density of the second anti-collision cotton is 18-25kg / m 3 , for example, it can be 18kg / m 3 , 18.5kg / m 3 , 19kg / m 3 , 19.5kg / m 3 , 20kg / m 3 , 20.5kg / m 3 , 21kg / m 3 , 22kg / m 3 , 23kg / m 3 , 24kg / m 3 or 25kg / m 3 The above values ​​are not limited to the above values, and other values ​​not listed in the above values ​​are also applicable.

[0023] Preferably, the material of the second anti-collision cotton includes PP material or PE material.

[0024] In the present invention, the PP material or PE material can be selected from EPE pearl cotton material, polyester fiber material or foam material, etc., and those skilled in the art can make a selection according to actual needs.

[0025] Preferably, the bending strength of the box body material of the hollow box in step (2) is ≥25 MPa, for example, it can be 25 MPa, 26 MPa, 27 MPa, 28 MPa, 29 MPa, 30 MPa, 31 MPa, 32 MPa, 33 MPa, 34 MPa, 35 MPa, 36 MPa, 37 MPa, 38 MPa, 39 MPa or 40 MPa, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0026] It should be noted that the present invention does not impose any specific limitation on the material of the hollow box, as long as the strength of the material meets the requirements.

[0027] As a preferred technical solution of the present invention, in step (2), the material of the first anti-collision cotton includes PP material or PE material.

[0028] Preferably, a through hole is provided at the center of the first anti-collision cotton.

[0029] In the present invention, a through hole is arranged at the center of the first anti-collision cotton, so that the staff can take it easily.

[0030] As a preferred technical solution of the present invention, in step (2), the diameter of the first anti-collision cotton is 96%-98% of the inner diameter of the circular product, for example, it can be 96%, 96.2%, 96.5%, 96.6%, 96.8%, 97%, 97.2%, 97.5%, 97.6%, 97.8% or 98%, etc., but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0031] Preferably, in step (2), the thickness of the first anti-collision cotton is 97%-102% of the depth of the circular ring product, for example, it can be 97%, 97.5%, 98%, 98.5%, 99%, 99.5%, 100%, 100.5%, 101%, 101.5% or 102%, etc., but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0032] In the present invention, in order to prevent the first anti-collision cotton from squeezing and deforming the annular product, the diameter and thickness of the first anti-collision cotton need to be controlled to be slightly smaller than the inner diameter and depth of the annular product. However, the size of the first anti-collision cotton cannot be too small, otherwise the annular product will move relative to each other in the hollow box during transportation.

[0033] As a preferred technical solution of the present invention, the density of the anti-collision cotton board in step (2) is 18-25kg / m 3 , for example, it can be 18kg / m 3 , 18.5kg / m 3 , 19kg / m 3 、19.5kg / m 3, 20kg / m 3 , 20.5kg / m 3 , 21kg / m 3 , 22kg / m 3 , 23kg / m 3 , 24kg / m 3 or 25kg / m 3 The above values ​​are not limited to the above values, and other values ​​not listed in the above values ​​are also applicable.

[0034] In the present invention, since the impact force on the upper surface of the product is relatively small, the density of the anti-collision cotton board is controlled at 18-25kg / m 3 The use requirements can be met within the range.

[0035] Preferably, the material of the anti-collision cotton plate in step (2) includes PP material or PE material.

[0036] As a preferred technical solution of the present invention, the thickness of the anti-collision cotton board in step (2) is 3-4 cm, for example, it can be 3 cm, 3.1 cm, 3.2 cm, 3.3 cm, 3.4 cm, 3.5 cm, 3.6 cm, 3.7 cm, 3.8 cm, 3.9 cm or 4 cm, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0037] Preferably, the length and width of the anti-collision cotton plate in step (2) are the same as the length and width of the hollow box.

[0038] As a preferred technical solution of the present invention, the packaging method also includes step (3): hard plates are assembled on the top and bottom of the second packaging product obtained in step (2) and tied tightly, and then hard corner guards are arranged at the side corners of the second packaging product and wrapped with film.

[0039] In the present invention, the tightening is performed using a plurality of cable ties.

[0040] In the present invention, a hollow box with a specific strength is used during the packaging process and the outer surface of the hollow box is further assembled, thereby further improving the stability of the quality of the ring-shaped product during the transportation or handling process.

[0041] As a preferred technical solution of the present invention, the packaging method comprises the following steps:

[0042] (1) using a plastic film to perform semi-vacuum sealing packaging on the annular product to obtain a first packaged product with a vacuum degree of -0.02 to -0.06 MPa;

[0043] The material of the annular product includes aluminum;

[0044] (2) pre-installing a second anti-collision cotton with a size matching that of the first packaged product in the side of the hollow box, and then placing the first anti-collision cotton, the first packaged product obtained in step (1) and the anti-collision cotton plate in the hollow box in sequence to obtain a second packaged product;

[0045] The bending strength of the box body sheet of the hollow box is ≥25MPa; the density of the second anti-collision cotton is 18-25kg / m 3 ;

[0046] The density of the first anti-collision cotton is 32-36kg / m 3 ; A through hole is provided at the center of the first anti-collision cotton; the diameter of the first anti-collision cotton is 96%-98% of the inner diameter of the annular product; the thickness of the first anti-collision cotton is 97%-102% of the depth of the annular product;

[0047] The density of the anti-collision cotton board is 18-25kg / m 3 ; The thickness of the anti-collision cotton board is 3-4cm; the length and width of the anti-collision cotton board are the same as the length and width of the hollow box;

[0048] The materials of the first anti-collision cotton, the second anti-collision cotton and the anti-collision cotton plate all include PP material or PE material;

[0049] (3) Hard plates are assembled on the top and bottom of the second packaged product obtained in step (2) and tied tightly, and then hard corner guards are arranged on the side corners of the second packaged product and wrapped with film.

[0050] Compared with the prior art, the present invention has the following beneficial effects:

[0051] The packaging method provided by the present invention first performs semi-vacuum sealing packaging on the ring-shaped product, combines the use of anti-collision cotton materials with different densities and structures on the upper and lower surfaces of the first packaging product, and finally assembles the outer surface of the hollow box to provide differentiated protection for different parts of the product. It can not only provide stronger cushioning protection and better support and stability, avoid the problems of collision and deformation of the ring-shaped product during transportation or handling, but also reduce the overall packaging cost; wherein, the safety factor of the ring-shaped product during transportation is improved by more than 95%. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 is a photograph of the first packaged product provided by the present invention;

[0053] Figure 2 This is a photo of the first anti-collision cotton and the first packaging product placed in the hollow box provided by the present invention;

[0054] Figure 3This is a photo of the present invention after placing an anti-collision cotton board in the hollow box;

[0055] Figure 4 is a photo of the second packaged product provided by the present invention. DETAILED DESCRIPTION

[0056] The technical solution of the present invention is further described below by specific implementation methods. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0057] A specific embodiment of the present invention provides a packaging method for a ring-shaped product, the packaging method comprising the following steps:

[0058] (1) The annular product is semi-vacuum sealed to obtain a first packaged product (such as Figure 1 shown);

[0059] The material of the annular product includes aluminum;

[0060] (2) A second anti-collision cotton having a size matching that of the first packaged product is pre-installed in the side of the hollow box, and then the first anti-collision cotton, the first packaged product obtained in step (1) (such as Figure 2 As shown) and anti-collision cotton plate (as Figure 3 As shown), a second packaged product (as shown Figure 4 shown);

[0061] The density of the second anti-collision cotton is 18-25kg / m 3 ;

[0062] The density of the first anti-collision cotton is 32-36kg / m 3 ; A through hole is provided at the center of the first anti-collision cotton; the diameter of the first anti-collision cotton is 96%-98% of the inner diameter of the annular product; the thickness of the first anti-collision cotton is 97%-102% of the depth of the annular product;

[0063] The density of the anti-collision cotton board is 18-25kg / m 3 ; The thickness of the anti-collision cotton board is 3-4cm; the length and width of the anti-collision cotton board are the same as the length and width of the hollow box.

[0064] In the following examples and comparative examples, the packaging materials used are all commercially available materials. The ring-shaped products are packaged for long-distance transportation, and the quality of the ring-shaped products before and after transportation is tracked to verify the stability of the packaging method provided by the present invention.

[0065] Example 1

[0066] This embodiment provides a packaging method for a ring-shaped product, the packaging method comprising the following steps:

[0067] (1) using a plastic film to perform semi-vacuum sealing packaging on the aluminum ring-shaped product to obtain a first packaged product with a vacuum degree of -0.04 MPa;

[0068] (2) pre-installing a second anti-collision cotton with a size matching that of the first packaged product in the side of the hollow box, and then placing the first anti-collision cotton, the first packaged product obtained in step (1) and the anti-collision cotton plate in the hollow box in sequence to obtain a second packaged product;

[0069] The bending strength of the box body sheet of the hollow box is 32MPa; the density of the second anti-collision cotton is 22kg / m 3 ;

[0070] The density of the first anti-collision cotton is 35kg / m 3 ; A through hole is provided at the center of the first anti-collision cotton; the diameter of the first anti-collision cotton is 97% of the inner diameter of the annular product; the thickness of the first anti-collision cotton is 98% of the depth of the annular product;

[0071] The density of the anti-collision cotton board is 22kg / m 3 ; The thickness of the anti-collision cotton board is 3.5 cm; the length and width of the anti-collision cotton board are the same as the length and width of the hollow box;

[0072] The first anti-collision cotton, the second anti-collision cotton and the anti-collision cotton plate are all made of EPE pearl cotton material;

[0073] (3) Hard plates are installed on the top and bottom of the second packaged product obtained in step (2) and are fastened with cable ties. Then, hard corner guards are arranged at the side corners of the second packaged product and wrapped with film.

[0074] In this embodiment, it is found by comparison that the ring-shaped product does not deform when transported to the destination, and its quality is basically equivalent to the quality of the product before transportation, that is, the packaging method of the present invention has good stability.

[0075] Example 2

[0076] This embodiment provides a packaging method for a ring-shaped product, the packaging method comprising the following steps:

[0077] (1) using a plastic film to perform semi-vacuum sealing packaging on the aluminum ring-shaped product to obtain a first packaged product with a vacuum degree of -0.06 MPa;

[0078] (2) pre-installing a second anti-collision cotton with a size matching that of the first packaged product in the side of the hollow box, and then placing the first anti-collision cotton, the first packaged product obtained in step (1) and the anti-collision cotton plate in the hollow box in sequence to obtain a second packaged product;

[0079] The bending strength of the box body sheet of the hollow box is 35MPa; the density of the second anti-collision cotton is 18kg / m 3 ;

[0080] The density of the first anti-collision cotton is 32kg / m 3 ; A through hole is provided at the center of the first anti-collision cotton; the diameter of the first anti-collision cotton is 96% of the inner diameter of the annular product; the thickness of the first anti-collision cotton is 101% of the depth of the annular product;

[0081] The density of the anti-collision cotton board is 18kg / m 3 ; The thickness of the anti-collision cotton board is 4cm; the length and width of the anti-collision cotton board are the same as the length and width of the hollow box;

[0082] The first anti-collision cotton, the second anti-collision cotton and the anti-collision cotton plate are all made of EPE pearl cotton material;

[0083] (3) Hard plates are installed on the top and bottom of the second packaged product obtained in step (2) and are fastened with cable ties. Then, hard corner guards are arranged at the side corners of the second packaged product and wrapped with film.

[0084] In this embodiment, it is found by comparison that the ring-shaped product does not deform when transported to the destination, and its quality is basically equivalent to the quality of the product before transportation, that is, the packaging method of the present invention has good stability.

[0085] Example 3

[0086] This embodiment provides a packaging method for a ring-shaped product, the packaging method comprising the following steps:

[0087] (1) using a plastic film to perform semi-vacuum sealing packaging on the aluminum ring-shaped product to obtain a first packaged product with a vacuum degree of -0.02 MPa;

[0088] (2) pre-installing a second anti-collision cotton with a size matching that of the first packaged product in the side of the hollow box, and then placing the first anti-collision cotton, the first packaged product obtained in step (1) and the anti-collision cotton plate in the hollow box in sequence to obtain a second packaged product;

[0089] The bending strength of the box body sheet of the hollow box is 25MPa; the density of the second anti-collision cotton is 25kg / m 3 ;

[0090] The density of the first anti-collision cotton is 36kg / m 3 ; A through hole is provided at the center of the first anti-collision cotton; the diameter of the first anti-collision cotton is 98% of the inner diameter of the annular product; the thickness of the first anti-collision cotton is 97% of the depth of the annular product;

[0091] The density of the anti-collision cotton board is 25kg / m 3 ; The thickness of the anti-collision cotton board is 3cm; the length and width of the anti-collision cotton board are the same as the length and width of the hollow box;

[0092] The first anti-collision cotton, the second anti-collision cotton and the anti-collision cotton plate are all made of EPE pearl cotton material;

[0093] (3) Hard plates are installed on the top and bottom of the second packaged product obtained in step (2) and are fastened with cable ties. Then, hard corner guards are arranged at the side corners of the second packaged product and wrapped with film.

[0094] In this embodiment, it is found by comparison that the ring-shaped product does not deform when transported to the destination, and its quality is basically equivalent to the quality of the product before transportation, that is, the packaging method of the present invention has good stability.

[0095] Example 4

[0096] This embodiment provides a packaging method for a ring-shaped product. Except that the vacuum degree in the first packaged product in step (1) is -0.8 MPa, other conditions are the same as those in Embodiment 1.

[0097] In this embodiment, since the annular product is fully vacuumed, the first packaged product is deformed and cannot meet the use requirements.

[0098] Example 5

[0099] This embodiment provides a packaging method for a ring-shaped product. Except that the vacuum degree in the first packaged product in step (1) is -0.01 MPa, other conditions are the same as those in Embodiment 1.

[0100] In this embodiment, since the vacuum degree is high during semi-vacuum sealing packaging, it is not conducive to reducing the residual gas in the film. In addition, the ring-shaped product collides with the gas molecules in the film, and the adhesion of the formed film decreases. By comparison, it is found that although the ring-shaped product does not deform when transported to the destination, its surface quality is lower than that of the product before transportation and cannot meet the use requirements.

[0101] Example 6

[0102] This embodiment provides a packaging method for annular products, except that in step (2), the density of the second anti-collision cotton and the anti-collision cotton board is 10kg / m3 Except for this, other conditions are the same as those in Example 1.

[0103] In this embodiment, because the density of the second anti-collision cotton and the anti-collision cotton board is too low, their buffering performance and mechanical properties are reduced. By comparison, it is found that the ring-shaped product has collision and deformation problems when transported to the destination, and its quality is lower than that of the product leaving the factory before transportation.

[0104] Example 7

[0105] This embodiment provides a packaging method for annular products, except that in step (2), the density of the second anti-collision cotton and the anti-collision cotton board is 32kg / m 3 Except for this, other conditions are the same as those in Example 1.

[0106] In this embodiment, because the density of the second anti-collision cotton and the anti-collision cotton board is too high, their cushioning performance is reduced. By comparison, it is found that the ring-shaped product has collision problems when transported to the destination, and its quality is lower than the quality of the product before transportation. In addition, the packaging cost is also increased.

[0107] Example 8

[0108] This embodiment provides a packaging method for a ring-shaped product. Except that in step (2), the thickness of the first anti-collision cotton is 90% of the depth of the ring-shaped product, other conditions are the same as those in Embodiment 1.

[0109] In this embodiment, because the first anti-collision cotton does not match the size of the circular ring-shaped product, the circular ring-shaped product will experience relative movement in the hollow box during transportation. By comparison, it is found that the circular ring-shaped product will have collision problems when transported to the destination, and its quality is lower than that of the product before transportation.

[0110] Example 9

[0111] This embodiment provides a packaging method for a ring-shaped product. Except that in step (2), the thickness of the first anti-collision cotton is 110% of the depth of the ring-shaped product, other conditions are the same as those in Embodiment 1.

[0112] In this embodiment, when the thickness of the first anti-collision cotton is too large, because the first anti-collision cotton does not match the size of the ring-shaped product and the density of the first anti-collision cotton is relatively high, there is a problem that the first anti-collision cotton squeezes the film during transportation, causing the film to be damaged. By comparison, it is found that the quality of the ring-shaped product when transported to the destination is lower than the quality of the product before transportation, that is, when it leaves the factory.

[0113] Comparative Example 1

[0114] This comparative example provides a packaging method for a ring-shaped product. Except that the first anti-collision cotton in step (2) is replaced by the second anti-collision cotton, other conditions are the same as those in Example 1.

[0115] In this comparative example, when the anti-collision cotton is all made of the second anti-collision cotton with lower density, it is unable to provide differentiated protection for different parts of the product, resulting in a decrease in cushioning performance, support and stability. By comparison, it is found that the ring-shaped product has collision and deformation problems when transported to the destination, and its quality is lower than that of the product leaving the factory before transportation.

[0116] Comparative Example 2

[0117] This comparative example provides a packaging method for a ring-shaped product, except that in step (2), the density of the first anti-collision cotton is 25 kg / m 3 Except for this, other conditions are the same as those in Example 1.

[0118] In this comparative example, when the density of the first anti-collision cotton is low, it cannot provide stronger cushioning protection and better support and stability for the product. By comparison, it is found that the ring-shaped product has collision and deformation problems when transported to the destination, and its quality is lower than that of the product leaving the factory before transportation.

[0119] Comparative Example 3

[0120] This comparative example provides a packaging method for a ring-shaped product, except that in step (2), the density of the first anti-collision cotton is 40 kg / m 3 Except for this, other conditions are the same as those in Example 1.

[0121] In this comparative example, when the density of the first anti-collision cotton is high, it cannot provide better cushioning protection for the product. By comparison, it is found that the ring-shaped product has collision problems when transported to the destination, and its quality is lower than that of the product before transportation. In addition, the packaging cost is also increased.

[0122] The applicant declares that the above is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention shall fall within the protection scope and disclosure scope of the present invention.

Claims

1. A method for packaging a ring-shaped product, characterized in that: The packaging method comprises the following steps: (1) performing semi-vacuum sealing packaging on the ring-shaped product to obtain a first packaged product; (2) placing the first anti-collision cotton, the first packaging product obtained in step (1), and the anti-collision cotton plate in the hollow box in sequence to obtain a second packaging product; The density of the first anti-collision cotton is 32-36kg / m 3 .

2. The packaging method according to claim 1, characterized in that: The material of the annular product in step (1) includes aluminum.

3. The packaging method according to claim 1 or 2, characterized in that: In step (1), the annular product is semi-vacuum sealed and packaged with a plastic film; Preferably, the vacuum degree in the first packaged product in step (1) is -0.06 to -0.02 MPa.

4. The packaging method according to any one of claims 1 to 3, characterized in that: In step (2), a second anti-collision cotton matching the size of the first packaged product is pre-installed in the side of the hollow box; Preferably, the density of the second anti-collision cotton is 18-25kg / m 3 ; Preferably, the material of the second anti-collision cotton includes PP material or PE material; Preferably, the bending strength of the box body material of the hollow box in step (2) is ≥25 MPa.

5. The packaging method according to any one of claims 1 to 4, characterized in that: Step (2) The material of the first anti-collision cotton includes PP material or PE material; Preferably, a through hole is provided at the center of the first anti-collision cotton.

6. The packaging method according to any one of claims 1 to 5, characterized in that: Step (2) the diameter of the first anti-collision cotton is 96%-98% of the inner diameter of the annular product; Preferably, in step (2), the thickness of the first anti-collision cotton is 97%-102% of the depth of the annular product.

7. The packaging method according to any one of claims 1 to 6, characterized in that: The density of the anti-collision cotton board in step (2) is 18-25kg / m 3 ; Preferably, the material of the anti-collision cotton plate in step (2) includes PP material or PE material.

8. The packaging method according to any one of claims 1 to 7, characterized in that: The thickness of the anti-collision cotton board in step (2) is 3-4 cm; Preferably, the length and width of the anti-collision cotton plate in step (2) are the same as the length and width of the hollow box.

9. The packaging method according to any one of claims 1 to 8, characterized in that: The packaging method further comprises step (3): assembling hard plates on the top and bottom of the second packaging product obtained in step (2) and tying them tightly, and then configuring hard corner guards on the side corners of the second packaging product and wrapping them with film.

10. The packaging method according to any one of claims 1 to 9, characterized in that: The packaging method comprises the following steps: (1) using a plastic film to perform semi-vacuum sealing packaging on the annular product to obtain a first packaged product with a vacuum degree of -0.06 to -0.02 MPa; The material of the annular product includes aluminum; (2) pre-installing a second anti-collision cotton with a size matching that of the first packaged product in the side of the hollow box, and then placing the first anti-collision cotton, the first packaged product obtained in step (1) and the anti-collision cotton plate in the hollow box in sequence to obtain a second packaged product; The bending strength of the box body sheet of the hollow box is ≥25MPa; the density of the second anti-collision cotton is 18-25kg / m 3 ; The density of the first anti-collision cotton is 32-36kg / m 3 ; A through hole is provided at the center of the first anti-collision cotton; the diameter of the first anti-collision cotton is 96%-98% of the inner diameter of the annular product; the thickness of the first anti-collision cotton is 97%-102% of the depth of the annular product; The density of the anti-collision cotton board is 18-25kg / m 3 ; The thickness of the anti-collision cotton board is 3-4cm; the length and width of the anti-collision cotton board are the same as the length and width of the hollow box; The materials of the first anti-collision cotton, the second anti-collision cotton and the anti-collision cotton plate all include PP material or PE material; (3) Hard plates are assembled on the top and bottom of the second packaged product obtained in step (2) and tied tightly, and then hard corner guards are arranged on the side corners of the second packaged product and wrapped with film.

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