Corrugated carton with good waterproof performance

Abstract

The invention relates to a corrugated carton with good waterproof performance, which belongs to the technical field of corrugated cartons, and is characterized in that a water absorption expansion component is embedded into a similar triangular area formed by a wave trough and an adjacent wave crest of corrugated paper, and when the corrugated paper absorbs water, the component automatically expands by absorbing water, applies radial supporting force to the wave trough area and fills fiber gaps, so that the corrugated paper is waterproof. The moisture diffusion path is blocked, and the compressive strength loss caused by cellulose fiber hydrogen bond fracture is counteracted, so that the corrugated core is prevented from collapsing, the problem caused by long-term exposure of a corrugated carton in a low-temperature and high-humidity environment in cold-chain transportation is solved, mechanical support can be provided in time, the compressive strength of the corrugated paper is enhanced, and the service life of the corrugated paper is prolonged. And the corrugated core can be prevented from collapsing, interlayer stripping and compressive strength reduction, the corrugated core is suitable for frequent temperature fluctuation conditions in cold chain transportation, external intervention is not needed, and therefore the integrity of the carton structure and the safety of objects contained in the carton are guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of corrugated paper boxes, and in particular relates to a corrugated paper box with good waterproof performance. Background Art

[0002] Corrugated boxes have become the core packaging containers for modern logistics and transportation due to their lightness, strength, environmental friendliness and recyclability. Their structure is usually composed of an outer layer of paper, a wavy core paper (corrugated paper) and an inner layer of lining paper. The outer layer of paper provides external protection and beauty, the core paper disperses external forces through cushioning and support, and the lining paper is bonded to the outer and core paper to enhance overall strength.

[0003] However, during cold chain transportation, corrugated boxes may be exposed to low temperature and high humidity environments (such as 0-4°C refrigeration or -18°C freezing) for a long time. Especially when the corrugated boxes are being transported, due to the large temperature difference between the inside and outside of the box, the water vapor in the air will reach the dew point temperature due to the temperature drop when it contacts the surface of the box, and then condense into water droplets, that is, surface condensation. Surface condensation will cause moisture to invade the interior of the box through seams, openings and fiber capillary action. In addition, since the main component of the corrugated box itself is cellulose fiber, these fibers are connected by hydrogen bonds to form a network structure, providing strength and rigidity. When the cardboard absorbs water, moisture will enter between the fibers, destroying the hydrogen bonds, resulting in a weakening of the bonding force between the fibers, thereby causing the corrugated core to collapse, interlayer peeling and a significant decrease in compressive strength, causing the box to deform and even contaminate the contents. Therefore, there is an urgent need for a corrugated box with good waterproof performance. Summary of the Invention

[0004] In order to solve the above problems existing in the prior art, the present invention provides a corrugated paper box with good waterproof performance, which solves the problems of the prior art.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A corrugated paper box with good waterproof performance includes a plurality of outer layer papers, corrugated paper, inner layer papers and a water absorption expansion component. Each of the outer layer papers, corrugated paper and inner layer papers forms a group, and the corrugated paper is arranged between the outer layer papers and the inner layer papers. Several groups of the outer layer papers, corrugated paper and inner layer papers are interconnected to form an integral paper box. A quasi-triangular area is formed between the trough of the corrugated paper and two adjacent wave peaks. The water absorption expansion component is arranged in the quasi-triangular area. The water absorption expansion component automatically expands by absorbing moisture from the corrugated paper, thereby improving the compressive strength of the corrugated paper.

[0007] As a further solution of the present invention, the water absorption and expansion component includes a water absorption part, two telescopic parts and a supporting part. The adjacent two peaks of the corrugated paper are connected by the supporting part. The water absorption part is arranged between the trough of the corrugated paper and the two peaks connected to the supporting part. One of the telescopic parts is arranged between the trough of the corrugated paper and the water absorption part, and the other telescopic part is arranged between the supporting part and the water absorption part.

[0008] As a further solution of the present invention, the telescopic portion includes a main rod and a movable rod, and the main rod and the movable rod are connected by a spring.

[0009] As a further solution of the present invention, the trough angle of the corrugated paper is 119°-121°, the wave height of the corrugated paper is 3mm-5mm, and the ratio of the wave height to the length of the corrugated paper is between 1:10-1:20.

[0010] As a further solution of the present invention, the fibers at the joints of each group of outer layer paper, corrugated paper and inner layer paper are melted and interwoven by high-frequency vibration.

[0011] As a further solution of the present invention, three layers of corrugation are provided at the corners of the entire carton, and elastic waterproof corner protectors are formed by stacking the three layers of corrugation.

[0012] As a further solution of the present invention, the outer layer of the carton is provided with a hydrophobic coating, and the inner layer of the lining is provided with a PE coating or an aluminum foil composite layer.

[0013] As a further solution of the present invention, a grid support plate is provided at the bottom of the entire carton.

[0014] As a further solution of the present invention, the outer surface of the entire carton is provided with a V-shaped guide groove.

[0015] As a further solution of the present invention, the outer surface of the entire carton is laser engraved with micron-scale protrusions, and the height of the micron-scale protrusions is 10 to 50 μm.

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

[0017] By embedding the water-absorbing expansion component into the triangular area formed by the trough and adjacent peak of the corrugated paper, when the corrugated paper absorbs water, the component automatically expands by absorbing moisture, exerting radial support force on the trough area, filling the fiber gaps, blocking the diffusion path of moisture, and offsetting the loss of compressive strength caused by the breakage of cellulose fiber hydrogen bonds, thereby preventing the collapse of the corrugated core. It solves the problem caused by the long-term exposure of corrugated boxes to low temperature and high humidity environments in cold chain transportation. It can not only provide mechanical support in time and enhance the compressive strength of corrugated paper, but also prevent the collapse of the corrugated core, interlayer peeling and compressive strength reduction. It is suitable for frequent temperature fluctuations in cold chain transportation and does not require external intervention, thereby ensuring the integrity of the carton structure and the safety of the contents. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0019] Figure 1 This is a schematic diagram of the overall structure of the carton of the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of the corrugated paper of the present invention;

[0021] Figure 3 It is an enlarged view of point A of the present invention.

[0022] Description of main component symbols:

[0023] In the figure: 1. Outer layer of paper; 2. Corrugated paper; 3. Inner layer of paper; 4. Water absorption and expansion component; 41. Water absorption part; 42. Expansion part; 43. Support part; 5. Carton as a whole; 6. Wave crest; 7. Wave trough. DETAILED DESCRIPTION

[0024] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0025] See also Figure 1 - Figure 3, this embodiment provides a corrugated paper box with good waterproof performance, including several outer layer papers 1, corrugated paper 2, inner layer papers 3 and water absorption expansion components 4, each outer layer paper 1, corrugated paper 2 and inner layer papers 3 are a group, and the corrugated paper 2 is arranged between the outer layer paper 1 and the inner layer papers 3, and several groups of outer layer papers 1, corrugated paper 2 and inner layer papers 3 are connected to each other to form a carton as a whole 5; a quasi-triangular area is formed between the trough 7 of the corrugated paper 2 and the two adjacent crests 6, and the water absorption expansion component 4 is arranged in the quasi-triangular area. The water absorption expansion component 4 automatically expands by absorbing moisture on the corrugated paper 2 to improve the compressive strength of the corrugated paper 2. The quasi-triangular area here refers to the triangular area formed between the two points where the water absorption expansion component 4 connects with the corrugated paper 2 and the bottom of the trough 7 of the corrugated paper 2, but because the trough 7 of the corrugated paper 2 is a curved arc, it is a quasi-triangular area, such as Figure 1 shown.

[0026] One thing that needs to be explained is that the stress on the material is relatively concentrated at the trough 7. When external force acts on the corrugated structure, the pressure and bending moment borne by the trough 7 area are greater than those of the peak 6 area, so stress concentration is more likely to occur. In addition, because the material in the trough 7 area is subjected to greater tension and bending, its deformation capacity is relatively small and its bending strength is low. This makes the trough 7 area more likely to break or damage when subjected to a large external force. Compared with the peak 6, the supporting force of the trough 7 area is smaller. The peak 6 can provide better support and bending resistance, while the supporting force of the trough 7 is relatively weak due to the shape limitation. Therefore, the water absorption expansion component 4 is directly embedded in the mechanical weak area of the corrugated structure, and the fiber gaps are filled by expansion to block the diffusion path of moisture along the corrugated core. The water absorption expansion component 4 is automatically activated after absorbing water, and provides mechanical support immediately after the fiber absorbs water. No external intervention is required, which is suitable for frequent temperature fluctuations in cold chain transportation.

[0027] At present, in cold chain transportation, corrugated boxes may be exposed to low temperature and high humidity environment for a long time, especially when the corrugated boxes are being transported. Due to the large temperature difference between the inside and outside of the box, when the water vapor in the air contacts the surface of the box, it will reach the dew point temperature due to the decrease in temperature, and then condense into water droplets, that is, surface condensation. Surface condensation will cause moisture to invade the interior of the box through seams, openings and fiber capillary action. In addition, since the main component of the corrugated box itself is cellulose fiber, these fibers are connected by hydrogen bonds to form a network structure, providing strength and rigidity. When the cardboard absorbs water, moisture will enter between the fibers, destroying the hydrogen bonds, resulting in a weakening of the bonding force between the fibers, thereby causing the corrugated core to collapse, interlayer peeling and a significant decrease in compressive strength, causing the box to deform and even contaminate the contents.

[0028] In order to solve the above problems, in this embodiment, the water-absorbing expansion component 4 is embedded in the triangular area formed by the trough 7 and the adjacent peak 6 of the corrugated paper. When the corrugated paper absorbs water, the component automatically expands by absorbing moisture, exerts radial support force on the trough 7 area, fills the fiber gaps, blocks the diffusion path of moisture, and offsets the loss of compressive strength caused by the breakage of cellulose fiber hydrogen bonds, thereby preventing the collapse of the corrugated core. It solves the problem caused by the long-term exposure of corrugated boxes to low temperature and high humidity environment in cold chain transportation. It can not only provide mechanical support in time and enhance the compressive strength of the corrugated paper 2, but also prevent the collapse of the corrugated core, interlayer peeling and compressive strength reduction. It is suitable for frequent temperature fluctuations in cold chain transportation and does not require external intervention, thereby ensuring the integrity of the carton structure and the safety of the contents.

[0029] Furthermore, when the corrugated paper absorbs water, in order to better enable the water absorption and expansion component 4 to automatically expand by absorbing water, a radial supporting force is applied to the trough 7 area, the fiber gaps are filled, the diffusion path of water is blocked, and the compressive strength loss caused by the breakage of the hydrogen bonds of the cellulose fibers, in this regard, in one embodiment, the water absorption and expansion component 4 includes a water absorption part 41, two telescopic parts 42 and a support part 43. The two adjacent peaks 6 of the corrugated paper 2 are connected by the support part 43. The water absorption part 41 is arranged between the trough 7 of the corrugated paper 2 and the two peaks 6 connected by the support part 43. One of the telescopic parts 42 is arranged between the trough 7 of the corrugated paper 2 and the water absorption part 41, and the other telescopic part 42 is arranged between the support part 43 and the water absorption part 41. The telescopic part 42 includes a main rod and a movable rod. The main rod and the movable rod are connected by a spring. The spring provides elastic buffering to adapt to the deformation of the corrugated paper caused by changes in temperature and humidity, thereby avoiding The rigid structure breaks, and it can also maintain a close fit between the component and the corrugated paper to prevent micro cracks caused by deformation. The water-absorbing part 41 is a rod-shaped structure made of SAP resin. Through processing techniques such as extrusion, casting or molding, the SAP resin can be processed into different shapes, including rod-shaped structures. This processing needs to ensure that the SAP resin maintains its structural integrity during the processing without affecting its water absorption performance. Through the high water absorption of SAP resin, it quickly absorbs water and expands. The function of the telescopic part 42 is to allow the component to shrink when drying and stretch after absorbing water to avoid initial stress on the corrugated structure; the support part 43 is a connecting rod used to connect the wave crest 6 to ensure that the expansion force is evenly transmitted to the corrugated core. At the same time, the support part 43 also allows the corrugated corrugated paper 2, the water-absorbing part 41, the telescopic part 42 and the support part 43 to form a pressure-resistant whole. The whole is dynamically sealed through mechanical linkage to prevent interlayer peeling caused by moisture penetration;

[0030] In addition, it should be noted that the two ends of the water absorption part 41 are located at the midpoint of the arc area between the crest 6 and the trough 7 of the corrugated paper 2. This design can be evenly distributed on both sides of the arc area, thereby reducing local pressure concentration when subjected to external force and avoiding damage to the cardboard. The arc area provides a good buffering effect. The water absorption part 41 is located here to better absorb and disperse external impact force and protect internal items from damage. Since the water absorption part 41 is designed to absorb liquid, the midpoint between the crest 6 and the trough 7 can ensure that the liquid is more evenly distributed inside the cardboard during the absorption process, thereby improving the water absorption efficiency.

[0031] In order to achieve better waterproof effect, in one embodiment, the angle of the trough 7 of the corrugated paper 2 is 119°-121°, the wave height of the corrugated paper 2 is 3mm-5mm, and the ratio of the wave height to the length of the corrugated paper 2 is between 1:10-1:20. The design of the corrugated paper 2 can effectively prevent moisture penetration, especially when the trough 7 angle is set to 119°-121°, a relatively tight structure can be formed, making it difficult for moisture to penetrate. The trough 7 angle of 120° provides a relatively balanced structural strength, which can resist external pressure and impact while ensuring waterproof performance, thereby increasing the durability of the corrugated paper. The wave height is set between 3mm and 5mm, and the ratio to the corrugated length is between 1:10 and 1:20. Such a ratio can ensure that the use of materials is more efficient and will not cause waste of materials. The wave height is 3mm The wave height between 3mm and 5mm can provide sufficient support so that the corrugated paper will not be easily deformed when subjected to a certain load, thus ensuring its structural stability. Too high a wave height will lead to increased material usage and increased costs, while too low a wave height may affect the waterproof effect and structural strength. The wave height of 3mm to 5mm can find a balance between cost and performance. The wave height within this range is easier to achieve in the existing manufacturing process, which can not only meet production efficiency but also ensure product quality. In addition, different types of coatings and environmental conditions have different requirements for the waterproof performance of corrugated paper. The ratio of wave height to length is between 1:10 and 1:20, which can adapt to a variety of load requirements and application environments, such as packaging boxes, storage boxes, etc. Therefore, the ratio of wave height to corrugated length is approximately between 1:10 and 1:20. These designs are comprehensively considered in combination with coating type, environmental conditions, load requirements, etc.

[0032] In addition to solving the waterproof problem at the corrugated paper 2, there will be insufficient waterproofing at other positions of the corrugated paper box, which will weaken the function of the water-absorbing and expanding component 4. In order to avoid this problem, in one embodiment, the fibers at the joints of each group of outer layer paper 1, corrugated corrugated paper 2 and inner layer paper 3 are melted and interwoven by high-frequency vibration, and the fibers at the joints are melted and interwoven by ultrasonic or high-frequency vibration, so that the sealing of the joints is improved, the permeability is reduced, and the main channel of capillary action is blocked. Three layers of corrugation are set at the corners of the carton as a whole 5. Elastic waterproof corner guards are formed by superimposing the three layers of corrugation. The corners are superimposed with three layers of corrugation and coated with elastic material to form a local reinforcement structure, improve the compressive strength of the corners, avoid the rupture of the coating caused by stress concentration, and fill the gaps between layers with elastic material to block the intrusion of moisture along the corners. A hydrophobic coating is set on the outer layer paper 1 of the carton as a whole 5. The hydrophobic coating here can be fluorocarbon resin, so that the contact angle is greater than 110°, realizing surface self-cleaning, where the contact angle refers to the liquid contacting the solid surface. At the angle formed on the solid surface, a PE coating or aluminum foil composite layer is provided on the inner lining paper 3, which can fully seal and block water vapor and prevent condensation water from penetrating inward. The double-layer protection inside and outside takes into account both static waterproofness and dynamic moisture-proofness. The bottom of the carton 5 is provided with a grid support plate to form a ground clearance to avoid direct contact with the wet ground and reduce the water absorption of the bottom of the box. In addition, the grid structure evenly distributes the stacking load to prevent local buckling. The outer surface of the carton 5 is provided with a V-shaped guide groove to guide the water flow to quickly leave the box body. The outer surface of the carton 5 is laser-engraved with micron-level protrusions, and the height of the micron-level protrusions is 10 to 50 μm; the height of the micron-level protrusions is 10 to 50 μm. This size can mimic the microstructure of the lotus leaf surface. When the contact angle is greater than 150°, the liquid will hardly spread on the solid surface. Due to the super-hydrophobicity of the lotus leaf surface, water droplets will form an almost perfect sphere on the lotus leaf surface and carry away dust and dirt during the rolling process. This effect enables the lotus leaf to remain clean and achieve self-cleaning even in a polluted environment.

[0033] It is worth mentioning that this corrugated cardboard box has achieved good waterproof performance by forming a multi-level dynamic waterproof system. The outer hydrophobic coating, guide grooves, and micron protrusions cooperate with each other to actively drain water. The middle layer of water absorption and expansion component 4 cooperates with the optimization of corrugated parameter responsiveness to repair structural strength, and the inner layer of PE or aluminum foil statically blocks; the bottom grid tray isolates ground water, forming a multi-level protection from the outside to the inside. The water intrusion path is systematically blocked, and the water absorption and expansion component 4 is not only waterproof, but also improves the wet compressive strength through mechanical support, and then solves the sealing and structural stability problems simultaneously through high-frequency vibration seams and three-layer corner design.

[0034] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make some changes or modifications to equivalent embodiments using the technical contents disclosed above. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A corrugated paper box with good waterproof performance, characterized in that: The carton box comprises a plurality of outer layer papers, corrugated paper, inner layer papers and water-absorbing expansion components, wherein each of the outer layer papers, corrugated paper and inner layer papers forms a group, and the corrugated paper is arranged between the outer layer papers and the inner layer papers. The plurality of groups of outer layer papers, corrugated paper and inner layer papers are interconnected to form a carton box as a whole; a quasi-triangular area is formed between the trough of the corrugated paper and two adjacent wave peaks, and the water-absorbing expansion component is arranged in the quasi-triangular area. The water-absorbing expansion component automatically expands by absorbing moisture from the corrugated paper, thereby improving the compressive strength of the corrugated paper.

2. A corrugated paper box with good waterproof performance according to claim 1, characterized in that: The water absorption and expansion component includes a water absorption part, two telescopic parts and a supporting part. The adjacent two peaks of the corrugated paper are connected by the supporting part. The water absorption part is arranged between the two peaks connected to the trough of the corrugated paper and the supporting part. One of the telescopic parts is arranged between the trough of the corrugated paper and the water absorption part, and the other telescopic part is arranged between the supporting part and the water absorption part.

3. A corrugated paper box with good waterproof performance according to claim 2, characterized in that: The telescopic part includes a main rod and a movable rod, and the main rod and the movable rod are connected through a spring.

4. A corrugated paper box with good waterproof performance according to claim 1, characterized in that: The trough angle of the corrugated paper is 119°-121°, the wave height of the corrugated paper is 3mm-5mm, and the ratio of the wave height to the length of the corrugated paper is between 1:10-1:

20.

5. The corrugated paper box with good waterproof performance according to claim 1, characterized in that: The fibers at the joints of each group of outer layer paper, corrugated paper and inner layer paper are melted and interwoven through high-frequency vibration.

6. A corrugated paper box with good waterproof performance according to claim 1, characterized in that: The corners of the entire carton are provided with three layers of corrugation, and elastic waterproof corner guards are formed by stacking the three layers of corrugation.

7. The corrugated paper box with good waterproof performance according to claim 1, characterized in that: The outer layer of the carton is provided with a hydrophobic coating, and the inner layer of the carton is provided with a PE coating or an aluminum foil composite layer.

8. The corrugated paper box with good waterproof performance according to claim 1, characterized in that: The bottom of the entire carton is provided with a grid support plate.

9. The corrugated paper box with good waterproof performance according to claim 1, characterized in that: The outer surface of the entire carton is provided with a V-shaped guide groove.

10. The corrugated paper box with good waterproof performance according to claim 1, characterized in that: The outer surface of the entire carton is laser engraved with micron-level protrusions, and the height of the micron-level protrusions is 10 to 50 μm.

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