Preparation method of foaming buffer packaging bag and article packaging method

Abstract

The invention discloses a preparation method of a foaming buffer packaging bag and an article packaging method.The packaging bag comprises an air column main bag body and at least two foaming buffer bag bodies, the foaming buffer bag bodies are oppositely arranged at the inner bottom and the inner top of the air column main bag body, and a first reaction bag body and a second reaction bag body are arranged in each foaming buffer bag body; the first reaction bag body and the second reaction bag body are respectively filled with a first foaming reactant and a second foaming reactant, and the foaming buffer bag body is provided with a plurality of exhaust holes. Foaming and article packaging can be carried out in the air column bag, double buffering protection of internal foaming buffering and external air column inflation buffering is formed, the excellent article packaging buffering effect is achieved, the using amount of foaming reactants can be reduced, and the material cost is reduced; meanwhile, the foaming buffering packaging bag is easy to prepare, full-mechanized production can be achieved, special equipment and dependence on manpower are not needed, industrial production is met, and the production cost is greatly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of packaging, and in particular to a method for preparing a foaming cushioning packaging bag and a method for packaging articles. Background Art

[0002] During transportation, fragile items such as glass and ceramics, or electrical products such as home appliances, usually need to be protected with foam materials during packaging. At present, foam cushioning materials used for packaging are generally produced by pre-foaming in molds. However, with the development of the express and other transportation industries, the types of transported products are diverse and the quantity of some products is small. The cushioning materials pre-foamed in molds cannot adapt to the shapes of most transported products, and each product requires a mold, which is high in production cost.

[0003] In this regard, there is a related technology that mixes and foams the foaming material by attaching it to the surface of the product during product packaging. However, the related technology cannot control the foaming amount during the foaming process, and the size and distribution of the bubbles have a great impact on the physical properties of the cushioning material. Uneven foaming will cause the cushioning material to be too thin or too thick in some parts, resulting in a reduction in the actual cushioning protection effect and failure to achieve the packaging cushioning expectations. Summary of the invention

[0004] The invention provides a method for preparing a foaming cushioning packaging bag and an article packaging method, so as to solve the technical problem that the cushioning protection effect of the current foaming packaging bag fails to reach the expected level due to uneven foaming.

[0005] In order to solve the above technical problems, in the first aspect, the present invention provides a method for preparing a foaming cushioning packaging bag, wherein the foaming cushioning packaging bag comprises an air column main bag body and at least two foaming cushioning bag bodies, wherein the foaming cushioning bag bodies are relatively arranged at the inner bottom and the inner top of the air column main bag body, wherein a first reaction bag body and a second reaction bag body are arranged in the foaming cushioning bag body, wherein the first reaction bag body and the second reaction bag body are respectively filled with a first foaming reactant and a second foaming reactant, and wherein the foaming cushioning bag body is provided with a plurality of exhaust holes; The preparation method comprises: A bag-making machine is used to make a primary bag body with an opening on one side, and a middle position perpendicular to the opening of the primary bag body is heat-sealed to form a first reaction bag body and a second reaction bag body, and then a first foaming reactant and a second foaming reactant are respectively injected into the first reaction bag body and the second reaction bag body, and then the opening of the primary bag body is heat-sealed to obtain a target primary bag body; Cut a piece of plastic film with a plurality of vent holes, and use an adhesive to bond the target primary bag body to one side of the plastic film to obtain the target plastic film; The plane shape of the air column main bag body is made by using a heat sealing machine; The edge of the target plastic film is bonded to the preset position of the plane shape to form a foaming cushioning bag body, and then the plane shape of the air column main bag body is bonded into a three-dimensional shape to obtain a foaming cushioning packaging bag.

[0006] In some embodiments, the area of ​​the plastic film is 4 to 9 times the inner bottom area or the inner top area of ​​the air column main bag body.

[0007] In some embodiments, the method of using a bag making machine to make a primary bag body with an opening on one side, and heat-sealing the middle position perpendicular to the opening of the primary bag body to form a first reaction bag body and a second reaction bag body includes: A first hollow film with openings on both sides is manufactured by a film blowing machine, wherein the material tensile strength of the first hollow film is greater than the material tensile strength of the plastic film, and the material tensile strength of the first hollow film is less than the material tensile strength of the air column main bag body; Using a heat sealer to heat seal one side opening of the first hollow film to obtain an initial bag body with one side opening; A heat sealing machine is used to heat seal the middle position of the initial bag body perpendicular to the opening of the initial bag body at a preset heat sealing time and a preset heat sealing temperature that are less than the heat sealing time and temperature of the first hollow film to form a first reaction bag body and a second reaction bag body.

[0008] In some embodiments, the heat seal width between the first reaction bag body and the second reaction bag body is smaller than the heat seal width of the initial bag body opening, and / or the heat seal shape between the first reaction bag body and the second reaction bag body is a tooth shape.

[0009] In some embodiments, the primary bag body is bonded to the center of the plastic film.

[0010] In some embodiments, the planar shape of the air column main bag body is made by using a heat sealing machine, including: A second hollow film is produced by using a film blowing machine; The second hollow film is heat-sealed by using a heat-sealing piece of a preset shape of a heat-sealing machine to set a one-way check valve and form a plurality of air column cavities connected to the one-way check valve to obtain an air column film, wherein the heat-sealing piece is composed of a plurality of heat-sealing blocks arranged at intervals; The edges of the air column film are cut to obtain the plane shape of the air column main bag body.

[0011] In some embodiments, bonding the edge of the target plastic film to the preset position of the plane shape to form a foaming cushioning bag body includes: A heat sealing folding machine is used to vertically heat seal and fold the edge of the target plastic film, and the folded edge of the target plastic film is heat sealed to a preset position of the plane shape to form a foaming cushioning bag body, and the circumference of the folded edge of the target plastic film is equal to the inner bottom circumference or the inner top circumference of the air column main bag body.

[0012] In some of the embodiments, two target plastic films are heat-sealed at two preset positions of the planar shape, respectively.

[0013] In some of the embodiments, the air column main bag body is a Q-shaped air column bag, an L-shaped air column bag or a U-shaped air column bag.

[0014] In a second aspect, the present invention further provides an article packaging method, based on the foaming cushioning packaging bag prepared by the above preparation method, the article packaging method comprises: Inflate the air column cavity of the air column main bag body so that the air column main bag body is inflated into a three-dimensional state; The foaming buffer bag bodies at the inner bottom and inner top of the air column main bag body are squeezed respectively, so that the first foaming reactant and the second foaming reactant are mixed to generate foam, so as to fill the inner bottom and inner top of the air column main bag body; Putting the items to be packaged into the air column main bag body, and closing the air column main bag body until the foaming of the inner bottom and the inner top of the air column main bag body is solidified; Continue to inflate the air column cavity of the air column main bag body until the air column cavity is fully inflated to complete the packaging of the items.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention bonds the foaming cushioning bag body to the inside of the air column main bag body so that foaming and article packaging can be performed in the air column bag, forming a double cushioning protection of internal foaming cushioning and external air column inflation cushioning, thereby achieving excellent article packaging cushioning effect, and can reduce the amount of foaming reactant used and reduce material costs. At the same time, the foaming cushioning packaging bag of the present invention is simple to prepare and can achieve fully mechanized production without the need for special equipment and reliance on manual labor, which is in line with industrial production and greatly reduces production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic flow chart of a method for preparing a foaming cushioning packaging bag according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the three-dimensional structure of a foam cushioning packaging bag after being inflated with an air column according to an embodiment of the present invention; Figure 3 It is a schematic diagram of the cross-sectional structure of a foaming cushioning packaging bag after the air column is inflated and before foaming, shown in an embodiment of the present invention; Figure 4A schematic diagram of a plane shape of an air column main bag body shown in an embodiment of the present invention; Figure 5 The present invention is a flowchart of an article packaging method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0017] In order to make the above-mentioned purpose, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0018] The indefinite articles "a" and "an" before the elements or components of the present invention have no limitation on the quantity requirements (i.e. the number of occurrences) of the elements or components. Therefore, "a" or "an" should be interpreted as including one or at least one, and the elements or components in the singular form also include the plural form, unless the number is obviously intended to be in the singular form.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0020] As described in the background technology, current foaming cushioning packaging bags have the following problems: 1. The instant foaming packaging bag cannot control the amount of foaming, resulting in uneven foaming, which results in the cushioning effect failing to achieve the expected result; 2. The instant foaming packaging bag is not a square bag, resulting in the foaming shape being like a double cone, with many gaps between the four sides of the packaging box; 3. On the basis of being unable to control the amount of foaming, in order to ensure the fitting effect with the article, the amount of foaming reactant in the instant foaming packaging bag can only be increased, resulting in a high cost of the foaming packaging bag; 4. The air column bag cannot have a good cushioning effect on irregular articles; 5. Once the air column bag leaks, it completely loses its protection.

[0021] To this end, the present invention adheres the foaming cushioning bag body to the inside of the air column main bag body so that foaming and article packaging can be carried out in the air column bag, forming a double cushioning protection of internal foaming cushioning and external air column inflation cushioning, thereby achieving excellent article packaging cushioning effect, and can reduce the amount of foaming reactant used and reduce material costs; at the same time, the foaming cushioning packaging bag of the present invention is simple to prepare and can achieve fully mechanized production, without the need for special equipment and reliance on manual labor, which is in line with industrial production and greatly reduces production costs.

[0022] See also Figures 1 to 3 The foaming cushioning packaging bag comprises an air column main bag body 1 and at least two foaming cushioning bag bodies 2, wherein the foaming cushioning bag bodies 2 are relatively arranged at the inner bottom and inner top of the air column main bag body 1, and a first reaction bag body 21 and a second reaction bag body 22 are arranged in the foaming cushioning bag body, wherein the first reaction bag body 21 and the second reaction bag body 22 are respectively filled with a first foaming reactant and a second foaming reactant, and the foaming cushioning bag body 2 is provided with a plurality of exhaust holes 23; The preparation method comprises: Step S101, using a bag making machine to make a primary bag body with an opening on one side, heat-sealing the middle position perpendicular to the opening of the primary bag body to form a first reaction bag body and a second reaction bag body, and then injecting a first foaming reactant and a second foaming reactant into the first reaction bag body and the second reaction bag body respectively, and then heat-sealing the opening of the primary bag body to obtain a target primary bag body; Step S102, cutting a plastic film with a plurality of vent holes, and bonding the target primary bag body to one side of the plastic film with an adhesive to obtain a target plastic film; Step S103, using a heat sealing machine to make the plane shape of the air column main bag body; Step S104, bonding the edge of the target plastic film to the preset position of the plane shape to form a foaming cushioning bag body, and then bonding the plane shape of the air column main bag body into a three-dimensional shape to obtain a foaming cushioning packaging bag.

[0023] In this embodiment, one side of the air column main bag body is opened, and one side of the opening is connected to the edge of the cover body at the inner top, so that the cover can be flipped to put the items into the air column main bag body. The inner bottom and the inner top of the air column main bag body are both provided with foaming cushioning bags, so that foaming can be generated at the inner bottom and the inner top, so that regular items and irregular items can be fitted and packaged from both ends of the inner side of the air column main bag body, respectively, to achieve dual cushioning protection of internal foaming cushioning and external air-filled cushioning, thereby improving the cushioning protection effect.

[0024] The commercially available instant foaming packaging bags are placed in a packaging box for foaming and curing. In the case of uneven foaming, there are many gaps between the foaming material and the box body, and more foaming reagents are required to fill the gaps, resulting in increased material costs. The present invention uses the air column main bag body as the outer layer of the foaming material, which can fill and buffer the gaps of the foaming material, greatly reduce the amount of foaming reagents used, and reduce material costs.

[0025] It is understandable that before the air column main bag body of the foam cushioning packaging bag is inflated, its volume is relatively small, so that multiple foam cushioning packaging bags can be stacked and packaged for easy transportation and sale.

[0026] Alternatively, if Figure 4As shown, two target plastic films are heat-sealed at the edges of two preset positions A and B of the plane shape respectively.

[0027] Optionally, the air column main bag body is a Q-shaped air column bag, an L-shaped air column bag or a U-shaped air column bag to meet various specifications.

[0028] Optionally, the area of ​​the plastic film is 4 to 9 times the inner bottom area or inner top area of ​​the air column main bag body, so that the foaming material has sufficient expansion volume, and for irregular objects, there is sufficient foaming surface area to fit the irregular objects, thereby improving the fit between the foaming material and the objects.

[0029] In some embodiments, the method of using a bag making machine to make a primary bag body with an opening on one side, and heat-sealing the middle position perpendicular to the opening of the primary bag body to form a first reaction bag body and a second reaction bag body includes: A first hollow film with openings on both sides is manufactured by a film blowing machine, wherein the material tensile strength of the first hollow film is greater than the material tensile strength of the plastic film, and the material tensile strength of the first hollow film is less than the material tensile strength of the air column main bag body; Using a heat sealer to heat seal one side opening of the first hollow film to obtain an initial bag body with one side opening; A heat sealing machine is used to heat seal the middle position of the initial bag body perpendicular to the opening of the initial bag body at a preset heat sealing time and a preset heat sealing temperature that are less than the heat sealing time and temperature of the first hollow film to form a first reaction bag body and a second reaction bag body.

[0030] In this embodiment, the material tensile strength is: plastic film < first hollow film < air column main bag body. The three can be made of the same material but with different material thicknesses to achieve different material tensile strengths, or different materials can be used. In order to make the foaming material fit the article better, the plastic film is made of a soft material; and because the first reaction bag body and the second reaction bag body cannot be connected when not packaged, that is, the first foaming reactant and the second foaming reactant cannot be mixed, so in order to ensure that the heat seal strip between the first reaction bag body and the second reaction bag body will not separate and the bag body will not break during transportation, storage and sales, the first hollow film is made of a material with a stronger tensile strength than the plastic film; and in order to ensure that the air column main bag body has strong impact resistance and other properties, the air column main bag body is made of a material with a stronger tensile strength.

[0031] The film blowing machine blows the film to obtain a hollow long film with openings at both ends, cuts a corresponding section according to a preset size as a first hollow film, heat-seals the opening at one end of the first hollow film, and then heat-seals the middle position of the first hollow film, wherein the heat-sealing time and temperature of the opening are both greater than the heat-sealing time and temperature of the middle, so as to ensure that the heat-sealing strength of the opening is higher than that of the middle, so as to ensure that when the first reaction bag body and the second reaction bag body are extruded, the middle heat-sealing strip is separated before the heat-sealing strip of the opening, thereby connecting the first reaction bag body and the second reaction bag body, ensuring that the first foaming reactant and the second foaming reactant are mixed evenly before foaming, thereby improving the foaming uniformity.

[0032] Optionally, the heat seal width between the first reaction bag body and the second reaction bag body is smaller than the heat seal width of the initial bag body opening, and / or the heat seal shape between the first reaction bag body and the second reaction bag body is a tooth shape, so as to ensure that the first reaction bag body and the second reaction bag body are connected before the initial bag body and the foaming buffer bag body, wherein the tooth shape is heat-sealed by a tooth-shaped heat seal strip, and setting the heat seal shape to a tooth shape can make the heat seal strip more easily separated when the first reaction bag body and the second reaction bag body are squeezed, thereby connecting the first reaction bag body with the second reaction bag body.

[0033] Optionally, the primary bag body is bonded to the center of the plastic film so that the foaming generated by the mixture of the first foaming reactant and the second foaming reactant can be evenly spread to all sides, thereby improving the uniformity of the foaming density.

[0034] In some embodiments, the planar shape of the air column main bag body is made by using a heat sealing machine, including: A second hollow film is produced by using a film blowing machine; The second hollow film is heat-sealed by using a heat-sealing piece of a preset shape of a heat-sealing machine to set a one-way check valve 11 and form a plurality of air column cavities 12 connected to the one-way check valve to obtain an air column film, wherein the heat-sealing piece is composed of a plurality of heat-sealing blocks arranged at intervals; The edges of the air column film are cut to obtain the plane shape of the air column main bag body.

[0035] In this embodiment, if Figure 4 As shown in the figure, the one-way check valve is a valve flap that automatically opens and closes by the flow of gas itself, and is used to prevent gas from flowing back. It connects multiple gas column cavities to facilitate the inflation operation.

[0036] In some embodiments, bonding the edge of the target plastic film to the preset position of the plane shape to form a foaming cushioning bag body includes: A heat sealing folding machine is used to vertically heat seal and fold the edge of the target plastic film, and the folded edge of the target plastic film is heat sealed to a preset position of the plane shape to form a foaming cushioning bag body, and the circumference of the folded edge of the target plastic film is equal to the inner bottom circumference or the inner top circumference of the air column main bag body.

[0037] In this embodiment, the heat-sealing folding machine is a device that heat-seals while folding. Since the area of ​​the target plastic film is larger than the inner bottom and the inner top, the side length of the target plastic film is also longer than the side length of the inner bottom and the inner top. Therefore, in order to heat-seal the edge of the target plastic film with the edge of the inner bottom and the inner top, the target plastic film is folded so that the circumference of the edge of the target plastic film after folding is equal to the circumference of the inner bottom or the circumference of the inner top of the air column main bag body.

[0038] Optionally, the target plastic film is rectangular, circular or oval in shape to facilitate hemming operation.

[0039] See also Figure 5 , Figure 5 The present invention is a schematic flow chart of an article packaging method according to an embodiment of the present invention. The article packaging method is applied to the foaming cushioning packaging bag prepared by the above preparation method. The article packaging method includes: Step S501, inflating the air column cavity of the air column main bag body to inflate the air column main bag body into a three-dimensional state; Step S502, respectively squeezing the foaming buffer bag body at the inner bottom and inner top of the air column main bag body to mix the first foaming reactant with the second foaming reactant to generate foam, so as to fill the inner bottom and inner top of the air column main bag body; Step S503, placing the items to be packaged into the air column main bag body, and closing the air column main bag body until the foaming of the inner bottom and the inner top of the air column main bag body is solidified; Step S504, continue to inflate the air column cavity of the air column main bag body until the air column cavity is fully inflated, completing the packaging of the article.

[0040] In this embodiment, when the first reaction bag body and the second reaction bag body are squeezed, the heat seal strip between the first reaction bag body and the second reaction bag body is separated by stress, and the two are connected so that the first foaming reactant and the second foaming reactant are mixed to generate gas, and the gas bursts the first reaction bag body or the second reaction bag body, so that the foaming material enters the foaming buffer bag body. The present invention can perform foaming and article packaging in the air column bag by bonding the foaming buffer bag body to the inside of the air column main bag body, forming a double buffer protection with internal foaming buffer and external air column inflation buffer, achieving excellent article packaging buffer effect, and can reduce the amount of foaming reactant used, reducing material costs; at the same time, the article packaging method of the present invention is simple to operate, does not require additional tools, and improves article packaging efficiency.

[0041] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0042] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. It is particularly pointed out that for those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for preparing a foaming cushioning packaging bag, characterized in that: The foaming cushioning packaging bag comprises an air column main bag body and at least two foaming cushioning bag bodies, wherein the foaming cushioning bag bodies are relatively arranged at the inner bottom and inner top of the air column main bag body, wherein a first reaction bag body and a second reaction bag body are arranged in the foaming cushioning bag body, wherein the first reaction bag body and the second reaction bag body are respectively filled with a first foaming reactant and a second foaming reactant, and wherein the foaming cushioning bag body is provided with a plurality of exhaust holes; The preparation method comprises: A bag-making machine is used to make a primary bag body with an opening on one side, and a middle position perpendicular to the opening of the primary bag body is heat-sealed to form a first reaction bag body and a second reaction bag body, and then a first foaming reactant and a second foaming reactant are respectively injected into the first reaction bag body and the second reaction bag body, and then the opening of the primary bag body is heat-sealed to obtain a target primary bag body; Cut a piece of plastic film with a plurality of vent holes, and use an adhesive to bond the target primary bag body to one side of the plastic film to obtain the target plastic film; The plane shape of the air column main bag body is made by using a heat sealing machine; The edge of the target plastic film is bonded to the preset position of the plane shape to form a foaming cushioning bag body, and then the plane shape of the air column main bag body is bonded into a three-dimensional shape to obtain a foaming cushioning packaging bag.

2. The method for preparing a foaming cushioning packaging bag according to claim 1, characterized in that: The area of ​​the plastic film is 4 to 9 times the inner bottom area or the inner top area of ​​the air column main bag body.

3. The method for preparing a foaming cushioning packaging bag according to claim 1, characterized in that: The method of using a bag making machine to make a primary bag body with an opening on one side, and heat-sealing the middle position perpendicular to the opening of the primary bag body to form a first reaction bag body and a second reaction bag body comprises: A first hollow film with openings on both sides is manufactured by a film blowing machine, wherein the material tensile strength of the first hollow film is greater than the material tensile strength of the plastic film, and the material tensile strength of the first hollow film is less than the material tensile strength of the air column main bag body; Using a heat sealer to heat seal one side opening of the first hollow film to obtain an initial bag body with one side opening; A heat sealing machine is used to heat seal the middle position of the initial bag body perpendicular to the opening of the initial bag body at a preset heat sealing time and a preset heat sealing temperature that are less than the heat sealing time and temperature of the first hollow film to form a first reaction bag body and a second reaction bag body.

4. The method for preparing a foaming cushioning packaging bag according to claim 3, characterized in that: The heat-sealing width between the first reaction bag body and the second reaction bag body is smaller than the heat-sealing width of the first bag body opening, and / or the heat-sealing shape between the first reaction bag body and the second reaction bag body is a tooth shape.

5. The method for preparing a foaming cushioning packaging bag according to claim 1, characterized in that: The primary bag body is bonded to the center of the plastic film.

6. The method for preparing a foaming cushioning packaging bag according to claim 1, characterized in that: The planar shape of the air column main bag body is made by using a heat sealing machine, including: A second hollow film is produced by using a film blowing machine; The second hollow film is heat-sealed by using a heat-sealing piece of a preset shape of a heat-sealing machine to set a one-way check valve and form a plurality of air column cavities connected to the one-way check valve to obtain an air column film, wherein the heat-sealing piece is composed of a plurality of heat-sealing blocks arranged at intervals; The edges of the air column film are cut to obtain the plane shape of the air column main bag body.

7. The method for preparing a foaming cushioning packaging bag according to claim 1, characterized in that: The step of bonding the edge of the target plastic film to the preset position of the plane shape to form a foaming cushioning bag body comprises: A heat sealing folding machine is used to vertically heat seal and fold the edge of the target plastic film, and the folded edge of the target plastic film is heat sealed to a preset position of the plane shape to form a foaming cushioning bag body, and the circumference of the folded edge of the target plastic film is equal to the inner bottom circumference or the inner top circumference of the air column main bag body.

8. The method for preparing a foaming cushioning packaging bag according to claim 7, characterized in that: The two target plastic films are heat-sealed at two preset positions of the plane shape respectively.

9. The method for preparing a foaming cushioning packaging bag according to claim 1, characterized in that: The air column main bag body is a Q-shaped air column bag, an L-shaped air column bag or a U-shaped air column bag.

10. A method for packaging articles, characterized in that: Based on the foaming cushioning packaging bag prepared by the preparation method according to any one of claims 1 to 9, the article packaging method comprises: Inflate the air column cavity of the air column main bag body so that the air column main bag body is inflated into a three-dimensional state; The foaming buffer bag bodies at the inner bottom and inner top of the air column main bag body are squeezed respectively, so that the first foaming reactant and the second foaming reactant are mixed to generate foam, so as to fill the inner bottom and inner top of the air column main bag body; Putting the items to be packaged into the air column main bag body, and closing the air column main bag body until the foaming of the inner bottom and the inner top of the air column main bag body is solidified; Continue to inflate the air column cavity of the air column main bag body until the air column cavity is fully inflated to complete the packaging of the items.

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