A fragile packaging paper box with a buffer structure

Abstract

The present invention discloses a fragile goods packaging paper box with a buffer structure, which belongs to the technical field of packaging boxes and comprises a paper box body and a buffer layer. The paper box body comprises the following structures: a paper box body, a paper box top plate extending upward is provided on the top of the paper box body, and a paper box bottom plate extending downward is provided on the bottom of the paper box body, the paper box top plate and the paper box bottom plate are folded to seal the paper box body so that a sealed packaging space is formed inside the paper box body; the buffer layer is arranged on the inner side of the paper box body, the buffer layer is composed of a plurality of buffer strips extending from the paper box top plate to the paper box body, a sealed expansion cavity is formed inside the buffer strip, a tightening belt is sleeved on the surface of the buffer strip, the tightening belt divides the expansion cavity into a liquid cavity and a solid cavity distributed up and down, the liquid cavity is filled with an expansion solution, and the solid cavity is filled with an expansion material; the packaging paper box of the present invention forms a buffer structure between the fragile goods and the paper box body through the expanded buffer layer, thereby improving the protective effect of the packaging paper box on the fragile goods.

Description

Technical Field

[0001] The present invention relates to the technical field of packaging boxes, and in particular to a fragile goods packaging paper box with a buffer structure. Background Art

[0002] In daily life or industrial transportation, in order to prevent fragile or valuable products from being damaged by mechanical loads such as impact and vibration, it is usually necessary to package and protect the products through cushioning packaging. At present, common cushioning packaging is made of materials such as foam cotton, bubble film, corrugated cardboard, honeycomb cardboard, etc. Foam cotton and bubble film have good toughness and elasticity, good cushioning performance, durability, and waterproofness, and can protect the products well. Both corrugated cardboard and honeycomb cardboard have many cavities inside and have certain cushioning performance, and the surface impact resistance is strong; bubble cotton or bubble film is usually used in combination with corrugated cardboard or honeycomb cardboard, that is, after wrapping the bubble cotton or bubble film on the surface of the product, the product is packaged in a packaging box made of corrugated cardboard or honeycomb cardboard. Bubble cotton or bubble film is usually wrapped on the surface of the product by winding, but the wrapping efficiency is low. Bubble cotton or bubble film can also be made into a packaging bag to wrap the product and put it into the packaging box, but the packaging bag is relatively thin and there is a gap between the packaging bag and the packaging box, which affects the protection effect of the packaging on the product.

[0003] Based on the above situation, a Chinese patent with announcement number CN106697584A discloses a packaging box for fragile objects, comprising an inner box, an outer box and a buffer layer arranged between the inner box and the outer box, the buffer layer is filled with buffer units spaced apart from each other, the buffer units include airbag units and buffer particles, the inner box comprises an outer shell and a buffer object arranged in the outer shell and tightly fitted with the fragile objects; the packaging box is provided with a buffer layer between the inner box and the outer box to improve the overall impact resistance of the packaging box, the packaging box packages the fragile objects through the inner box, and fills the buffer objects between the fragile objects and the inner box, but the buffer objects are difficult to fix the fragile objects inside the inner box, and during transportation, the fragile objects inside the packaging box are easily displaced inside the inner box under the influence of external factors such as vibration and impact, thereby impacting the inner wall of the inner box, and the packaging box is difficult to form stable and good protection for the fragile objects inside, so there is still room for improvement. Summary of the invention

[0004] In view of the technical defects existing in the background technology, the present invention proposes a fragile product packaging paper box with a buffer structure, which solves the above technical problems and meets the actual needs. The specific technical solution is as follows:

[0005] A fragile goods packaging paper box with a buffer structure comprises a paper box body and a buffer layer, wherein the paper box body comprises the following structures: a paper box body, wherein the top and bottom of the paper box body are both provided with openings, the top opening of the paper box body is provided with a paper box top plate extending upward, and the bottom opening is provided with a paper box bottom plate extending downward, wherein the paper box top plate and the paper box bottom plate are folded to seal the opening of the paper box body so that a sealed packaging space is formed inside the paper box body;

[0006] The buffer layer is arranged on the inner side of the paper box body, and the buffer layer is composed of a plurality of buffer strips extending from the top plate of the paper box to the body of the paper box. A sealed expansion cavity is formed inside the buffer strip, and a tightening band is sleeved on the surface of the buffer strip. The tightening band divides the expansion cavity into a liquid cavity and a solid cavity distributed up and down. The liquid cavity is filled with an expansion solution, and the solid cavity is filled with an expansion material.

[0007] As a further technical solution of the present invention, the expansion material is composed of water-absorbing resin particles and viscose fibers, and the mass ratio of the water-absorbing resin particles to the viscose fibers is 1:(0.5~2).

[0008] As a further technical solution of the present invention, the expansion solution is an acidic solution capable of releasing hydrogen ions, the water-absorbing resin particles are wrapped with reactive particles, and the reactive particles are selected from bicarbonate, carbonate or a mixture of the two.

[0009] As a further technical solution of the present invention, the acidic solution is selected from one or more of acetic acid solution, citric acid solution and malic acid solution.

[0010] As a further technical solution of the present invention, a plurality of hollow expansion balloons are provided on the surface of the buffer strip, the expansion balloons are connected to the solid cavity, and the expansion balloons are located on the side of the buffer strip away from the inner wall of the paper box body.

[0011] As a further technical solution of the present invention, a bottom padding strip extending along the bottom plate of the paper box and having a hollow interior is provided at the bottom of the buffer strip, and the bottom padding strip is communicated with the solid cavity.

[0012] As a further technical solution of the present invention, the bottom pad is filled with expansion material.

[0013] As a further technical solution of the present invention, the tightening band is located at the intersection of the carton top plate and the carton body, one side of the tightening band is close to the surface of the buffer strip and makes the buffer strip close to the inner side of the carton top plate, and the other side of the tightening band passes through the outer side of the carton top plate.

[0014] As a further technical solution of the present invention, the paper box body is made of composite paperboard, which is composed of a surface paper layer, a three-dimensional paper layer, and a surface paper layer in sequence in the thickness direction, and the shape of the three-dimensional paper layer is wavy or honeycomb.

[0015] As a further technical solution of the present invention, the surface paper layer is composed of a waterproof barrier layer, a base paper layer, and a waterproof barrier layer in sequence in the thickness direction.

[0016] The beneficial effects of the present invention are:

[0017] The packaging carton of the present invention improves the protection of fragile goods through the inner buffer layer, and the buffer layer is composed of a plurality of buffer strips. After the fragile goods are placed in the packaging space, the tightening band is loosened to allow the expansion solution to be injected into the solid cavity and absorbed by the expansion material, so that the expansion material gradually expands until the surface of the buffer strip abuts against the fragile goods. At the same time, the liquid cavity, the expansion balloon, and the bottom cushion layer are expanded by releasing carbon dioxide. The fragile goods can be easily placed in the packaging space before the buffer layer expands. The expanded buffer layer forms a buffer structure between the fragile goods and the carton body. The buffer layer improves the protection effect of the packaging carton on the fragile goods by wrapping the fragile goods in all directions. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The present invention is a cross-sectional view of a fragile packaging paper box with a buffer structure.

[0019] Figure 2 The present invention is a cross-sectional view of a fragile product packaging paper box with a buffer structure after the buffer layer is expanded.

[0020] Figure 3 It is a three-dimensional diagram of a fragile packaging box with a cushioning structure.

[0021] Figure 4 yes Figure 1 Partial schematic diagram at point A in the middle.

[0022] Figure 5 The diagram is a schematic diagram of an unfolded paper box for packaging fragile goods with a buffer structure.

[0023] Figure 6 The present invention is a cross-sectional view of water-absorbing resin particles of a fragile goods packaging paper box with a cushioning structure.

[0024] Figure 7 yes Figure 1 A partial schematic diagram of point B in the middle.

[0025] Figure 8 yes Figure 1 Partial schematic diagram of point C in the middle.

[0026] Among them: 1-carton body, 11-carton body, 12-carton top plate, 13-carton bottom plate, 14-packaging space, 2-buffer strip, 21-expansion cavity, 211-liquid cavity, 212-solid cavity, 22-tightening belt, 23-expansion balloon, 24-bottom pad strip, 3-water-absorbing resin particles, 31-reaction particles. DETAILED DESCRIPTION

[0027] The implementation modes of the present invention are described below in conjunction with the accompanying drawings and relevant embodiments. The implementation modes of the present invention are not limited to the following embodiments, and the present invention relates to relevant necessary components in the technical field, which should be regarded as the known technology in the technical field and can be known and mastered by the technical personnel in the technical field.

[0028] like Figure 1 , 2 As shown in Figures 3, 4 and 5, a fragile packaging paper box with a buffer structure comprises a paper box body 1 and a buffer layer. The paper box body 1 comprises the following structure: a paper box body 11, the top and bottom of the paper box body 11 are both provided with openings, the top opening of the paper box body 11 is provided with a paper box top plate 12 extending upward, and the bottom opening is provided with a paper box bottom plate 13 extending downward, the paper box top plate 12 and the paper box bottom plate 13 are folded to cover the opening of the paper box body 11 so that a sealed packaging space 14 is formed inside the paper box body 11;

[0029] The buffer layer is arranged on the inner side of the paper box body 1, and the buffer layer is composed of a plurality of buffer strips 2 extending from the top plate 12 of the paper box to the paper box body 11. A sealed expansion cavity 21 is formed inside the buffer strip 2, and a tightening belt 22 is sleeved on the surface of the buffer strip 2. The tightening belt 22 separates the expansion cavity 21 into a liquid cavity 211 and a solid cavity 212 distributed up and down. The liquid cavity 211 is filled with an expansion solution, and the solid cavity 212 is filled with an expansion material.

[0030] The packaging paper box of the present invention is mainly used for packaging fragile items. The paper box body 1 serves as the surface structure of the packaging paper box. The paper box body 1 can be made by cutting and folding high-strength paperboards such as cardboard, cardboard, corrugated paperboard, honeycomb paperboard, etc., which is beneficial to improving the strength and impact resistance of the packaging paper box surface. The shape of the paper box body 1 is a rectangular parallelepiped or a cube. The paper box body 11 is formed by connecting and fixing the paperboards end to end, and a rectangular or cube packaging space 14 is formed inside, and rectangular openings are formed at the top and the bottom. The paper box body Four carton top panels 12 are provided at the top opening edge of the carton body 11, and four carton bottom panels 13 are provided at the bottom edge of the carton body 11. The carton top panels 12 and the carton bottom panels 13 are folded to close the two openings of the carton body 11, so that the packaging space 14 is sealed. The packaging space 14 is used to accommodate fragile items to be packaged. After the fragile items are packaged inside the packaging space 14 and the packaging space 14 is closed, the carton body 11 is fixed to the carton top panels 12 and the carton bottom panels 13 by sealing tape, thereby completing the operation of packaging the fragile items inside the packaging carton.

[0031] The buffer layer of the present invention is arranged on the inner wall of the packaging paper box. The buffer layer can provide good protection for fragile items inside the packaging paper box through buffering. The buffer layer is composed of a plurality of buffer strips 2 extending in the vertical direction. The buffer strips 2 are made of high-pressure polyethylene as raw material, which is conducive to forming a buffer strip 2 with light texture, good transparency, non-toxicity, tastelessness and excellent buffer, shockproof and moisture-proof properties; in the production process of the buffer strip 2, high-pressure polyethylene can be extruded, cooled and cut to form a tubular material through an extrusion molding process, and the space inside the tubular material is the expansion cavity 21. The tubular material is tightened at about the middle position by a tightening belt 22 so that the expansion cavity 21 forms two independent spaces, namely a liquid cavity 211 and a solid cavity 212. An expansion solution is injected into the interior through the opening of the liquid cavity 211 and an expansion material is filled into the interior through the opening of the solid cavity 212. The openings at both ends of the tubular material are closed by a hot pressing process, so that the buffer strip 2 filled with the expansion solution and the expansion material can be obtained. Finally, a plurality of buffer strips 2 are bonded to the inner side of the paper box body 1 to form a buffer layer, thereby obtaining the packaging paper box of the present invention.

[0032] After adopting the above structure, it needs to be further explained that the expansion solution in the liquid cavity 211 can be water, and the solid cavity 212 is filled with an expansion material, and the expansion material is preferably a water-absorbing resin. After the carton bottom plate 13 is folded and adhered and fixed to the carton body 11 by sealing tape, the packaging carton can be loaded with fragile items. When the fragile items are loaded into the packaging carton, the expansion material does not absorb water and the solid cavity 212 presents a relatively flat state. The outer surface of the solid cavity 212 will not contact the surface of the fragile items. After the fragile items are loaded into the packaging carton, the tightening belt 22 is loosened to connect the solid cavity 212 in each buffer strip 2 with the liquid cavity 211, so that the expansion solution in the liquid cavity 211 flows into the solid cavity 212. , then the top plate 12 of the carton is folded and fixed to the carton body 11 by sealing tape, a sealed packaging space 14 is formed inside the packaging carton and fragile items are placed in the packaging space 14, the expansion material in the solid cavity 212 will gradually expand after absorbing the expansion solution and the outer surface of the solid cavity 212 will expand synchronously, so that the surface of the buffer strip 2 will gradually expand until it abuts against the surface of the fragile items, the expansion material is soft and elastic after absorbing water and swelling, and has a good buffering effect, the packaging carton protects the fragile items through a plurality of internal buffer strips 2 that abut against the surface of the fragile items after expansion, the fragile items are not easily displaced inside the packaging carton, and the packaging carton can well prevent the fragile items from being damaged during transportation.

[0033] Furthermore, the expansion material can be mixed with an adhesive and then filled into the solid cavity 212, so that the expansion material is fixed in the solid cavity 212. The expansion material can be fixed in the solid cavity 212 and expand during the water absorption process, so that the outer surface of the solid cavity 212 can be stably expanded and abut against the surface of the fragile product. In addition, in the current use of cushioning packaging, the bubble cotton or bubble film is wrapped around the surface of the fragile product, and the efficiency of wrapping is low. If the bubble cotton or bubble film is made into a packaging bag, in order to prevent the fragile product from separating from the packaging bag, the inner wall of the packaging bag needs to be close to the surface of the fragile product, which makes it difficult for the fragile product to be stuffed into the packaging bag. In the present invention, since the expansion material has a small volume before swelling by absorbing water, the fragile product can be easily loaded into the packaging box, and the expansion material will expand the surface of the buffer strip 2 and abut against the fragile product only after swelling by absorbing water, which can improve the convenience of packaging the fragile product into the packaging box and provide good protection for the fragile product.

[0034] As one of the preferred embodiments of the present invention, the expansion material is composed of water-absorbing resin particles 3 and viscose fibers, the mass ratio of the water-absorbing resin particles 3 to the viscose fibers is 1:(0.5~2), and the mass ratio of the water-absorbing resin particles 3 to the viscose fibers is preferably 1:1; the water-absorbing resin is selected from one or more of polyacrylamide, polyacrylic acid, and acrylamide copolymer. The water-absorbing resin particles 3 have strong hydrophilicity and absorb more than 100 times their own weight of water, and when they expand into hydrogel after absorbing water, it is difficult to separate the water even under pressure, so that the expansion material in the solid cavity 212 absorbs liquid and expands the surface of the buffer strip 2 to abut against the surface of the fragile product, and the expanded material after expansion is difficult to be flattened under the action of external force, thereby improving the protective effect of the buffer strip 2 on the fragile product; the viscose fiber has good water absorption and the viscose fiber after absorbing water has a certain hardness, and cooperates with the soft and elastic water-absorbing resin after absorbing water, so that the expanded material after absorbing water has a certain supporting strength and is elastic, thereby improving the buffering effect of the buffer strip 2 and the protective effect on the fragile product.

[0035] like Figure 6 As shown, as one of the preferred embodiments of the present invention, the expansion solution is an acidic solution that can release hydrogen ions, and the acidic solution is selected from one or more of acetic acid solution, citric acid solution, and malic acid solution. The water-absorbing resin particles 3 are wrapped with reactive particles 31, and the reactive particles 31 are selected from one or a mixture of bicarbonate and carbonate. When the expansion material absorbs the expansion solution, since the expansion material is fixed in the solid cavity 212 by an adhesive, the expansion material will only expand at the location of the solid cavity 212, and the position of the buffer strip 2 relative to the liquid cavity 211 will be in a flat state. When the expansion solution is an acidic solution that can release hydrogen ions and the water-absorbing resin particles 3 are wrapped with one or a mixture of bicarbonate and carbonate, after the water-absorbing resin particles 3 absorb the expansion solution into the interior, the reactive particles 31 will gradually dissolve in the expansion solution and react with hydrogen ions to release carbon dioxide, and the carbon dioxide will gradually fill the liquid cavity 211 to expand the liquid cavity 211, so that a plurality of bubble strips filled with gas are formed on the inner side of the top plate 12 of the paper box, thereby improving the protection effect of the top position of the paper box body 1 on fragile items.

[0036] It should be noted that the water-absorbing resin particles 3 can be produced by one of the methods of aqueous solution polymerization, reverse solution polymerization, and reverse suspension polymerization. During the production process, the reaction particles 31 are mixed in an aqueous solution or an aqueous phase. After the reaction is completed, during the drying process of the solid product, bicarbonate or carbonate will precipitate inside the water-absorbing resin particles 3 to form reaction particles 31, thereby obtaining water-absorbing resin particles 3 with the reaction particles 31 wrapped inside.

[0037] like Figure 1 , 2As shown in Figures 3, 5 and 7, as one of the preferred embodiments of the present invention, the surface of the buffer strip 2 is provided with a plurality of hollow expansion balloons 23, the expansion balloons 23 are connected to the solid cavity 212, and the expansion balloons 23 are located on the side of the buffer strip 2 away from the inner wall of the paper box body 11; the expansion balloons 23 can be formed by a blister process after the buffer strip 2 is extruded and formed, when the expansion material is filled into the solid cavity 212, part of the expansion material may be filled into the expansion balloons 23, after the expansion material absorbs the liquid, the surface of the expansion balloon 23 can be expanded until it abuts against the surface of the fragile product, and after the water-absorbent resin particles 3 absorb the expansion solution, the acidic solution reacts with the reaction particles 31 to release carbon dioxide, and the carbon dioxide is also filled into the expansion balloon 23 to expand it, and the buffer strip 2 can better abut against the recessed position of the fragile product through the plurality of expandable expansion balloons 23 on the surface, thereby increasing the contact area between the fragile product and the buffer layer, and improving the protective effect of the buffer layer on the fragile product.

[0038] Furthermore, an appropriate amount of thermoplastic elastomer or thermoplastic polyurethane can be added to the raw material high-pressure polyethylene for making the buffer strip 2, which is beneficial to improving the tensile elasticity of the buffer strip 2. When the water-absorbent resin particles 3 absorb the expansion solution and the expansion solution reacts with the reaction particles 31 to release carbon dioxide, the carbon dioxide fills the expansion cavity 21 and the expansion balloon 23, so that the surface of the buffer strip 2 and the expansion balloon 23 can be expanded to a certain extent. During the expansion process, the buffer strip 2 and the expansion balloon 23 can be stretched by their own elasticity, thereby achieving expansion through elastic deformation.

[0039] like Figure 1 , 2 As shown in Figures 5 and 8, as one of the preferred embodiments of the present invention, a bottom cushion strip 24 extending along the carton bottom plate 13 and having a hollow interior is provided at the bottom of the buffer strip 2, and the bottom cushion strip 24 is interconnected with the solid cavity 212; when the water-absorbing resin particles 3 absorb the swelling solution, the acidic solution reacts with the reactive particles 31 to release carbon dioxide, and the carbon dioxide can gradually fill into the bottom cushion strip 24 to expand its surface. By expanding the bottom cushion strip 24 arranged on the inner side of the carton bottom plate 13, i.e., the bottom of the packaging space 14, the buffering effect of the bottom of the packaging carton can be improved, a larger protection range can be provided for the fragile items in the packaging space 14, and the protective effect of the packaging carton on the fragile items can be improved.

[0040] As one of the preferred embodiments of the present invention, the bottom pad strip 24 is filled with an expansion material. After the expansion material absorbs liquid and expands, it has good elasticity and supporting strength. Compared with filling carbon dioxide into the bottom pad strip 24 to expand it, the expansion material expands by absorbing liquid in the bottom pad strip 24, which can better support the fragile goods from the bottom. Even if the buffer strip 2 is accidentally punctured, the bottom pad strip 24 can maintain its expanded structure, thereby improving the protective effect of the packaging carton on fragile goods.

[0041] like Figure 1 , 3 As shown in Figure 4, as one of the preferred embodiments of the present invention, the tightening band 22 is located at the intersection of the carton top plate 12 and the carton body 11, one side of the tightening band 22 is in close contact with the surface of the buffer strip 2 and makes the buffer strip 2 in close contact with the inner side of the carton top plate 12, and the other side of the tightening band 22 passes through the outer side of the carton top plate 12; by passing the tightening band 22 through the outer side of the carton top plate 12, the buffer strip 2 can be fixed to the carton body 1, and when it is necessary to inject the expansion solution in the liquid cavity 211 into the solid cavity 212 to absorb the expansion material, the tightening band 22 can be loosened or cut off from the outside of the carton body 1, thereby improving the convenience of the process of loosening the tightening band 22, or avoiding scratching the buffer strip 2 when cutting the tightening band 22.

[0042] As one of the preferred embodiments of the present invention, the paper box body 1 is made of a composite paperboard, which is composed of a surface paper, a three-dimensional paper layer, and a surface paper in sequence in the thickness direction, and the shape of the three-dimensional paper layer is wavy or honeycomb; when the shape of the three-dimensional paper layer is wavy, the composite paperboard adopts corrugated paperboard or similar paperboard, and the corrugated paperboard has good elasticity and extensibility. The paper box body 1 made of corrugated paperboard has good cushioning performance and strength, which is beneficial to improving the protective effect of the packaging carton on fragile items; when the shape of the three-dimensional paper layer is honeycomb, the composite paperboard adopts honeycomb paperboard or similar paperboard, and the honeycomb paperboard has good impact resistance and cushioning performance, high strength, and is not easy to deform, which is also beneficial to improving the protective effect of the packaging carton on fragile items.

[0043] As one of the preferred embodiments of the present invention, the surface paper is composed of a waterproof barrier layer, a base paper layer, and a waterproof barrier layer in sequence in the thickness direction. The base paper layer is preferably made of kraft paper. The waterproof barrier layer is preferably formed by coating a starch-based barrier material on the surface of the base paper layer and then curing it. The waterproof barrier layer can improve the waterproofness, sealing, toughness and other properties of the surface paper, thereby improving the waterproofness, sealing, toughness and other properties of the surface of the paper box body 1, so that the packaging carton can provide better protection for fragile items in the packaging space 14.

[0044] To summarize, the packaging carton of the present invention improves the protection of fragile goods through the inner buffer layer. The buffer layer is composed of a plurality of buffer strips 2. After the fragile goods are loaded into the packaging space 14, the tightening band 22 is loosened to allow the expansion solution to be injected into the solid cavity 212 and absorbed by the expansion material, so that the expansion material gradually expands until the surface of the buffer strip 2 abuts against the fragile goods. At the same time, the liquid cavity 211, the expansion balloon 23, and the bottom pad 24 are expanded by releasing carbon dioxide. The fragile goods can be easily loaded into the packaging space 14 before the buffer layer expands. The expanded buffer layer forms a buffer structure between the fragile goods and the carton body 1. The buffer layer improves the protection effect of the packaging carton on the fragile goods by wrapping the fragile goods in all directions.

[0045] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A fragile goods packaging paper box with a buffer structure, comprising a paper box body (1) and a buffer layer, characterized in that: The paper box body (1) comprises the following structure: a paper box body (11), the top and bottom of the paper box body (11) are both provided with openings, the top opening of the paper box body (11) is provided with a paper box top plate (12) extending upwards, and the bottom opening is provided with a paper box bottom plate (13) extending downwards, the paper box top plate (12) and the paper box bottom plate (13) are folded to seal the opening of the paper box body (11) so that a sealed packaging space (14) is formed inside the paper box body (11); The buffer layer is arranged on the inner side of the paper box body (1), and the buffer layer is composed of a plurality of buffer strips (2) extending from the top plate (12) of the paper box to the paper box body (11), and a sealed expansion cavity (21) is formed inside the buffer strip (2), and a tightening belt (22) is sleeved on the surface of the buffer strip (2), and the tightening belt (22) divides the expansion cavity (21) into a liquid cavity (211) and a solid cavity (212) distributed in an upper and lower manner, and the liquid cavity (211) is filled with an expansion solution, and the solid cavity (212) is filled with an expansion material; The expansion material is composed of water-absorbing resin particles (3) and viscose fibers, and the mass ratio of the water-absorbing resin particles (3) to the viscose fibers is 1:(0.5-2); The swelling solution is an acidic solution capable of releasing hydrogen ions. The water-absorbing resin particles (3) are encapsulated with reactive particles (31). The reactive particles (31) are selected from bicarbonate, carbonate, or a mixture of the two.

2. The fragile product packaging paper box with a buffer structure according to claim 1, characterized in that: The acidic solution is selected from one or more of acetic acid solution, citric acid solution and malic acid solution.

3. The fragile goods packaging paper box with a buffer structure according to claim 1, characterized in that: A plurality of hollow expansion balloons (23) are provided on the surface of the buffer strip (2), the expansion balloons (23) being in communication with the solid cavity (212), and the expansion balloons (23) are located on a side of the buffer strip (2) away from the inner wall of the paper box body (11).

4. The fragile product packaging paper box with a buffer structure according to claim 1, characterized in that: A bottom cushion strip (24) extending along the bottom plate (13) of the paper box and having a hollow interior is provided at the bottom of the buffer strip (2), and the bottom cushion strip (24) is in communication with the solid cavity (212).

5. The fragile product packaging paper box with a buffer structure according to claim 4, characterized in that: The bottom cushion strip (24) is filled with expansion material.

6. The fragile product packaging paper box with a buffer structure according to claim 1, characterized in that: The tightening band (22) is located at the intersection of the paper box top plate (12) and the paper box body (11), one side of the tightening band (22) is in close contact with the surface of the buffer strip (2) so that the buffer strip (2) is in close contact with the inner side of the paper box top plate (12), and the other side of the tightening band (22) passes through to the outer side of the paper box top plate (12).

7. The fragile product packaging paper box with a buffer structure according to claim 1, characterized in that: The paper box body (1) is made of composite paperboard, which is composed of a surface paper layer, a three-dimensional paper layer, and a surface paper layer in the thickness direction, and the shape of the three-dimensional paper layer is wavy or honeycomb.

8. The fragile product packaging paper box with a buffer structure according to claim 7, characterized in that: The surface paper (41) is composed of a waterproof barrier layer, a base paper layer, and a waterproof barrier layer in sequence in the thickness direction.

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