Eco-friendly double-piece packaging box for improved freshness retention

Abstract

The present invention relates to a packaging material for the storage and transportation of fresh food, for which maintaining freshness is essential. More specifically, the invention discloses a technical field regarding an eco-friendly double-layered packaging box for enhancing freshness preservation, wherein fresh food is stored inside, and ice packs are installed to supply cold air from all sides of the fresh food, thereby allowing the freshness of the fresh food to be maintained for a long time during storage and transportation through the cold air supplied from the ice packs.

Description

Technology Field

[0001] The present invention relates to a packaging material for the storage and transportation of fresh food, where the maintenance of freshness is essential. More specifically, it relates to an eco-friendly double-layered packaging box for improving freshness preservation, in which fresh food is stored inside, and ice packs are installed to supply cold air from all sides of the fresh food, thereby allowing the freshness of the fresh food to be maintained for a long time during storage and transportation through the cold air supplied from the ice packs. Background Technology

[0003] Generally, packaging boxes are widely used to maintain the freshness of products that require freezing or refrigeration, such as agricultural products, seafood, livestock products, and dairy products.

[0004] Packaging boxes made of expanded polystyrene, known as Styrofoam, are widely used for refrigerated or frozen products. These boxes typically consist of a box body with an open top for storing contents and a box lid with a body insertion section protruding by a certain thickness around the bottom perimeter to allow for a snug seal on the top of the box body. Ice packs are also sometimes placed inside the packaging box along with the product.

[0005] However, the foamed resin packaging box mentioned above has the problem of being bulky and difficult to recycle.

[0006] Consequently, as awareness of plastic use has recently risen, eco-friendly trends are spreading globally. Furthermore, as the number of consumers seeking value consumption for a sustainable and healthy future environment increases, the zero-waste movement—which aims to minimize waste generated in daily life and increase recycling—is gaining prominence, leading to a growing demand for eco-friendly packaging boxes.

[0007] Eco-friendly packaging boxes include those made of paper or cardboard.

[0008] Packaging boxes typically used when gifting expensive meat or fish are constructed using paper or cardboard instead of styrofoam to express the sender's thoughtfulness, printed with high-quality covers on the surface of the box, and designed to maintain the freshness of the meat or fish by inserting a cooling pack inside.

[0009] In ambient temperatures, ice packs are placed inside the packaging box, and in sub-zero temperatures, hot packs are placed inside to maintain the freshness of the products within the box. Typically, hot packs or ice packs stored inside the packaging box are referred to as cooling and heating packs, and their effectiveness may vary depending on the quantity of products stored inside the box and the arrangement method.

[0010] However, conventional packaging boxes made of paper or cardboard as described above had a problem in that the cold or warm air from the cooling pack was not efficiently transferred to the food, making it difficult to maintain the freshness of the food. Prior art literature

[0012] Republic of Korea Registered Patent No. 10-2319485 (Oct. 25, 2021) Republic of Korea Published Patent Application No. 10-2023-0150085 (Oct. 30, 2023) Republic of Korea Published Patent Application No. 10-2024-0159288 (Nov. 5, 2024) Republic of Korea Published Patent Application No. 10-2024-0159287 (Nov. 5, 2024) The problem to be solved

[0013] The present invention is a technology devised to solve the problems associated with the aforementioned prior art. Conventional packaging boxes made of paper or cardboard have a problem in that the cold or warm pack is installed only on the bottom and sides of the fresh food, so the cold or warm air from the pack is not efficiently transferred to the fresh food, making it difficult to maintain the freshness of the food.

[0014] The main purpose is to provide an eco-friendly double-walled packaging box for improving freshness preservation, wherein fresh food is stored inside the body, ice packs are installed on all sides of the fresh food to supply cold air from all sides, and the fresh food is prevented from coming into direct contact with the ice packs, while a base, internal partitions, and a fixing box are installed to stably maintain the preservation state of the fresh food. means of solving the problem

[0016] To achieve the above-mentioned intended purpose, the present invention comprises: a body (100) having a receiving space (110) with an open top formed therein, in which at least one pair of food packs (10) vacuum-packed with food are stored in the receiving space (110); a cover (200) attached and coupled from the lower surface of the body (100) to the rear, and having a length formed to cover the upper part of the receiving space (110) and the front of the body (100); and an inner cover (300) having a lower part attached and coupled to the rear of the receiving space (110) of the body (100), and having a length formed to cover the upper part of the receiving space (110). The present invention provides an eco-friendly double-walled packaging box for improving freshness preservation, characterized by comprising: a pair of internal partitions (400) that are respectively attached to the front and rear of the receiving space (110) of the body (100) and formed a buffer space (420) on one side and the other side of the receiving space (110).

[0017] In addition, the present invention comprises: a pair of lower ice packs (20) installed by being seated on one side and the other side of the lower portion of the receiving space (110); and a pair of side ice packs (30) inserted into buffer spaces (420) formed on one side and the other side of the receiving space (110). The device is characterized by comprising: a folding portion (502) formed in the center, and six support wings (510) formed by being folded downwards on one side front and rear and on the other side front and rear and on the other side after being folded by the folding portion (502), and the lower portions of the six support wings (510) are installed in contact with the lower surface of the receiving space (110), with the lower ice pack (20) positioned inside the lower side and the lower side respectively, and a support base (500) on which a food pack (10) is placed.

[0018] In addition, the present invention is characterized in that the inner partition (400) is configured to include a first ventilation opening (410) formed through the center through which cold air passes, and the base (500) is configured to include a plurality of second ventilation openings (520) through which cold air passes.

[0019] In addition, the present invention is characterized in that the other side of the support wing (510) located at the front and rear of the support wing (510) is formed to tilt toward the one side as it moves downward, and the one side of the support wing (510) located at the front and rear of the other side is formed to tilt toward the other side as it moves downward.

[0020] In addition, the present invention is characterized in that the support wing (510) comprises: a fitting hole (512) formed through a direction perpendicular to one side or the other side; and a fitting projection (514) formed protruding from the other side or one side to correspond to the fitting hole of the adjacent support wing (510), with the upper surface and lower surface formed to tilt downward as they move toward the other side or one side, and a plurality of sawtooth-shaped locking projections (514a) formed on the upper surface and lower surface to tilt upward toward one side or the other side.

[0021] In addition, the present invention is characterized in that the eco-friendly double-layered packaging box for improving freshness preservation comprises: a pair of auxiliary covers (600) having one side or the other side attached and coupled to the upper part of one side of the interior of the body (100) or the upper part of the other side of the interior of the body (100), with the length formed to cover the upper part of the buffer space (420); and the other side or one side attached and coupled to the upper part of one side of the interior partition (400) or the upper part of the other side of the interior partition (400), and attached and coupled so as to be positioned higher than the one side or the other side.

[0022] In addition, the present invention is characterized in that the eco-friendly double-layered packaging box for improving freshness preservation comprises: a pair of upper boxes (700) installed to be positioned on one side and the other side of the upper portion of the receiving space (110), and positioned on the upper portion of the food pack (10); and an upper ice pack (40) installed inside the upper box (700).

[0023] In addition, the present invention is characterized in that the upper box (700) comprises a plurality of third ventilation holes (710) through which cold air passes on the lower surface; and a plurality of gripping holes (720) formed to be foldable on the upper surface and forming handle holes when folded.

[0024] In addition, the present invention is characterized in that the eco-friendly double-layer packaging box for improving freshness preservation comprises: a horizontal fixing box (800) installed to be positioned at one or more of the front or rear of the receiving space (110) and positioned at the front or rear of the food pack (10); and a vertical fixing box (810) installed to be positioned at the upper side of the food pack (10) and positioned in the receiving space (110).

[0025] In addition, the present invention is characterized in that a coating layer made of a composition is formed on the inner side, inner other side, and inner lower surface of the body (100), the inner side and other side of the inner partition (400), and the outer and inner surfaces of the upper box (700) to improve water resistance. Effects of the invention

[0027] The eco-friendly double-walled packaging box for improving freshness preservation according to the present invention, as described above, has ice packs installed on the inner lower and upper sides and on one side and the other side of the body so that cold air generated from the ice packs moves to the inner center of the body, thereby evenly and efficiently supplying cold air to the food pack stored in the inner center of the body, so as to obtain the effect of improving the freshness preservation of the food inside the food pack. Brief explanation of the drawing

[0029] FIG. 1 is a perspective view (a) and a side view (b) showing a packaging box according to a preferred embodiment of the present invention. FIG. 2 is a perspective view (a) and a side view (b) showing a packaging box with the lid open according to a preferred embodiment of the present invention. FIG. 3 is a perspective view (a) and a side view (b) showing a packaging box with an open inner cover according to a preferred embodiment of the present invention. FIG. 4 is an exploded perspective view showing a body and a cover according to a preferred embodiment of the present invention. FIG. 5 is an exploded perspective view showing the assembly of an inner cover according to a preferred embodiment of the present invention. FIG. 6 is an exploded perspective view showing the combination of an internal gap and a side ice pack according to a preferred embodiment of the present invention. FIG. 7 is an exploded perspective view showing the assembly of an auxiliary cover according to a preferred embodiment of the present invention. FIG. 8a is an exploded perspective view showing the combination of a lower ice pack and a base according to a preferred embodiment of the present invention. Fig. 8b is a cross-sectional view of Fig. 9a. FIG. 9 is an exploded perspective view showing the combination of a food pack and a fixing box according to a preferred embodiment of the present invention. FIG. 10 is an exploded perspective view showing the combination of an upper ice pack and an upper box according to a preferred embodiment of the present invention. FIG. 11 is a perspective view showing an inner cover according to another embodiment of the present invention. FIG. 12 is an unfolded view showing a base (a) according to a preferred embodiment of the present invention and a base (b) according to another embodiment. Specific details for implementing the invention

[0030] The present invention relates to a packaging material for the storage and transportation of fresh food, where maintaining freshness is essential. More specifically, the invention relates to an eco-friendly double-layered packaging box for improving freshness preservation, wherein fresh food is stored inside a body (100), that is, in a receiving space (110), and a pair of upper ice packs (40), lower ice packs (20), and side ice packs (30) are installed on the upper and lower parts and on one side and the other side of the receiving space (110) respectively so that cold air can be supplied from all sides of the fresh food, thereby allowing the freshness of the fresh food to be maintained for a long time during storage and transportation through the cold air supplied from the pair of upper ice packs (40), lower ice packs (20), and side ice packs (30).

[0032] The eco-friendly double-layered packaging box for improving freshness preservation according to the present invention as described above comprises: a body (100) having a receiving space (110) with an open top formed therein, in which at least one pair of food packs (10) vacuum-packed with food are stored in the receiving space (110); a cover (200) attached and connected from the lower surface to the rear of the body (100), with a length formed to cover the upper part of the receiving space (110) and the front of the body (100); and an inner cover (300) with a lower part attached and connected to the rear of the receiving space (110) of the body (100), with a length formed to cover the upper part of the receiving space (110). The device is characterized by comprising: a pair of internal partitions (400) that are respectively attached to the front and rear of the receiving space (110) of the body (100) and form a buffer space (420) on one side and the other side of the receiving space (110).

[0033] In addition, the present invention comprises: a pair of lower ice packs (20) installed by being seated on one side and the other side of the lower portion of the receiving space (110); and a pair of side ice packs (30) inserted into buffer spaces (420) formed on one side and the other side of the receiving space (110). The device is characterized by comprising: a folding portion (502) formed in the center, and six support wings (510) formed by being folded downwards on one side front and rear and on the other side front and rear and on the other side after being folded by the folding portion (502), and the lower portions of the six support wings (510) are installed in contact with the lower surface of the receiving space (110), with the lower ice pack (20) positioned inside the lower side and the lower side respectively, and a support base (500) on which a food pack (10) is placed.

[0034] In addition, the present invention is characterized in that the inner partition (400) is configured to include a first ventilation opening (410) formed through the center through which cold air passes, and the base (500) is configured to include a plurality of second ventilation openings (520) through which cold air passes.

[0035] In addition, the present invention is characterized in that the other side of the support wing (510) located at the front and rear of the support wing (510) is formed to tilt toward the one side as it moves downward, and the one side of the support wing (510) located at the front and rear of the other side is formed to tilt toward the other side as it moves downward.

[0036] In addition, the present invention is characterized in that the support wing (510) comprises: a fitting hole (512) formed through a direction perpendicular to one side or the other side; and a fitting projection (514) formed protruding from the other side or one side to correspond to the fitting hole of the adjacent support wing (510), with the upper surface and lower surface formed to tilt downward as they move toward the other side or one side, and a plurality of sawtooth-shaped locking projections (514a) formed on the upper surface and lower surface to tilt upward toward one side or the other side.

[0037] In addition, the present invention is characterized in that the eco-friendly double-layered packaging box for improving freshness preservation comprises: a pair of auxiliary covers (600) having one side or the other side attached and coupled to the upper part of one side of the interior of the body (100) or the upper part of the other side of the interior of the body (100), with the length formed to cover the upper part of the buffer space (420); and the other side or one side attached and coupled to the upper part of one side of the interior partition (400) or the upper part of the other side of the interior partition (400), and attached and coupled so as to be positioned higher than the one side or the other side.

[0038] In addition, the present invention is characterized in that the eco-friendly double-layered packaging box for improving freshness preservation comprises: a pair of upper boxes (700) installed to be positioned on one side and the other side of the upper portion of the receiving space (110), and positioned on the upper portion of the food pack (10); and an upper ice pack (40) installed inside the upper box (700).

[0039] In addition, the present invention is characterized in that the upper box (700) comprises a plurality of third ventilation holes (710) through which cold air passes on the lower surface; and a plurality of gripping holes (720) formed to be foldable on the upper surface and forming handle holes when folded.

[0040] In addition, the present invention is characterized in that the eco-friendly double-layer packaging box for improving freshness preservation comprises: a horizontal fixing box (800) installed to be positioned at one or more of the front or rear of the receiving space (110) and positioned at the front or rear of the food pack (10); and a vertical fixing box (810) installed to be positioned at the upper side of the food pack (10) and positioned in the receiving space (110).

[0041] In addition, the present invention is characterized in that a coating layer made of a composition is formed on the inner side, inner other side, and inner lower surface of the body (100), the inner side and other side of the inner partition (400), and the outer and inner surfaces of the upper box (700) to improve water resistance.

[0043] Hereinafter, the present invention will be described in detail with reference to Drawings 1 to 12 illustrating embodiments of the present invention.

[0045] The body (100), which is a major component of the present invention, is

[0046] A receiving space (110) with an open top is formed, and a food pack (10) with vacuum-packed food is stored in the receiving space (110). An upper ice pack (40), a lower ice pack (20), and a pair of side ice packs (30), which will be described in detail later, are installed in the receiving space (110) together with the food pack (10) so that cold air is delivered to the food pack (10), thereby maintaining the freshness of the food packaged in the food pack (10).

[0047] The body (100) of the present invention is made of paper material, specifically hard cardboard, and is formed with an open top so that a receiving space (110) with an open top is formed inside.

[0048] At this time, the body (100) of the present invention is configured to include a magnet (not shown in the drawing) embedded in the lower front part, and the magnet corresponds to a magnet embedded in the end of a cover (200) which will be described in detail later, thereby realizing the effect of stably maintaining the upper part of the receiving space (110) in a closed state when the cover (200) covers the upper part and the front part.

[0050] The cover (200), which is a major component of the present invention, is

[0051] The above body (100) is attached and joined from the lower surface to the rear surface via an adhesive, and is formed with a length that can cover the upper part of the receiving space (110), that is, the upper part of the body (100) and the front of the body (100). A magnet described above is embedded in the front that covers the front of the body (100), and as the front corresponds to the magnet embedded in the body (100), the front is detachably connected to the front of the body (100), thereby stably maintaining a closed state of the upper part of the body (100), that is, the upper part of the receiving space (110), or opening the upper part of the receiving space (110).

[0052] The cover (200) of the present invention is made of paper material, similar to the body (100), but is made of hard cardboard and is formed with a width greater than the width of the body (100) to stably cover and protect the lower surface, rear surface, upper surface, and front surface of the body (100).

[0053] At this time, the reason the cover (200) of the present invention is attached to the lower surface and rear of the body (100) is to protect the lower and rear parts, where the most impact occurs during the transport of the packaging box of the present invention.

[0055] The inner cover (300), which is a major component of the present invention, is

[0056] The lower part is attached to and connected to the rear of the receiving space (110) of the body (100), and the length is formed so as to cover the upper part of the receiving space (110). This allows the receiving space (110) to be closed first before the previously described cover (200) closes the receiving space (110), and then the upper part is pressed by the cover (200) so that the receiving space (110) can be closed more stably and firmly in a double closure, thereby allowing the food pack (10) to be stored more safely.

[0057] The inner cover (300) of the present invention is made of paper material, but is made of soft cardboard, which is softer than the body (100) and the cover (200), so as to more flexibly close the upper part of the receiving space (110).

[0058] At this time, the inner cover (300) of the present invention may further include an insertion wing (310) formed by being bent downward on one side and the other side, wherein the insertion wing (310) is inserted between the auxiliary cover (200), which will be described in detail later, and the body (100) to improve the airtightness of the upper one side and the other side of the receiving space (110), thereby enabling stable maintenance of the freshness of the food pack (10).

[0059] In addition, the inner cover (300) of the present invention has a waterproof sheet (not shown in the drawing) attached to its surface or a coating layer, which will be described in detail later, formed thereon to prevent the durability of the body (100) from being reduced by condensation caused by the transmitted cold.

[0060] In addition, it is preferable that the lower surface of the inner cover (300) of the present invention and the surface in contact with the inner lower surface of the body (100) be bonded using an adhesive or double-sided adhesive tape.

[0061] In addition, the reason the lower part of the inner cover (300) of the present invention is attached to the rear of the receiving space (110) of the body (100) is to ensure that the rear of the stored food pack (10) is protected once more by the inner cover (300).

[0063] The internal partition (400), which is a major component of the present invention, is

[0064] The front and rear portions are respectively attached and combined to the front and rear portions of the receiving space (110) of the body (100), and a buffer space (420) is formed on one side and the other side of the receiving space (110), thereby forming a pair. A side ice pack (30), which will be described in detail later, is inserted and installed in the buffer space (420), so that the side of the vacuum-packaged food (hereinafter collectively referred to as 'food pack (10)') can maintain its freshness through the cold air generated from the side ice pack (30).

[0065] The inner partition (400) of the present invention is made of paper material, but is made of a rigid cardboard that is more flexible than the body (100) and cover (200) and more rigid than the inner cover (300), so that the cushioning space (420) can be formed stably.

[0066] At this time, the hard, hard, and soft mentioned in the present invention are hardness levels determined by the thickness of the cardboard-type paper, with the highest hardness being referred to as hard, the next highest hardness as hard, and the lowest hardness as soft. The hard has the hardness of a cardboard called hardboard among cardboards made of paper material.

[0067] In addition, the internal partition (400) of the present invention is configured to include a first ventilation opening (410) formed through the center, through which cold air generated from the side ice pack (30), which will be described in detail later, passes.

[0068] The size and shape of the first vent (410) are not specifically limited, but a large rectangular shape is preferred so that the entire cold air generated from the side ice pack (30) can be sufficiently transferred to the food pack (10), and it is obvious that the size and shape of the first vent (410) can be formed in various ways.

[0069] Meanwhile, the present invention comprises a lower ice pack (20) installed by being seated in the lower part of the receiving space (110), and a pair of side ice packs (30) installed by being inserted into a buffer space (420) formed by the internal partition (400) on one side and the other side of the receiving space (110).

[0070] In addition, the present invention comprises a base (500) having a folding portion (502) formed in the center, and six support wings (510) formed by being folded downward on one side front and rear and on the other side front and rear and on the other side after being folded by the folding portion (502), with the lower portions of the six support wings (510) installed in contact with the lower surface of the receiving space (110), and installed so that a lower ice pack (20) is positioned inside the lower side and the lower side respectively, and a food pack (10) is placed on the upper portion.

[0071] In connection with the above, the base (500) is made of paper material, specifically hard cardboard, and is configured to include a plurality of second ventilation holes (520) through which cold air generated from the lower ice pack (20) passes.

[0072] That is, the present invention allows cold air generated from the lower ice pack (20) to move upward through the second ventilation opening (520) of the base (500) to lower the temperature of the lower part of the food pack (10), and cold air generated from the side ice pack (30) to move inward through the first ventilation opening (410) of the inner partition (400) to lower the temperature of the side of the food pack (10), thereby maintaining the freshness of the food.

[0073] In addition, the base (500) and the internal partition (400) prevent the food pack (10) from coming into direct contact with the lower ice pack (20) and the side ice pack (30), thereby preventing spoilage and damage to the food due to excessive temperature drop.

[0074] In addition, the above-mentioned base (500) may be provided as a pair so as to be installed on one side and the other side of the receiving space (110), but in the present invention, the base (500) is made of a single cardboard so that the folding part (502) formed in the center is folded, thereby making it easy to install the base (500).

[0075] In addition, the above-mentioned base (500) can obtain the effect of being more firmly supported in the center as the above-mentioned folding part (502) is folded, thereby enabling it to stably withstand the load of the food pack (10) placed on top and the upper ice pack (40), which will be described in detail later.

[0076] At this time, the other side of the support wing (510) located at the front and rear of the support wing (510) of the base (500) is formed to tilt toward the one side as it moves downward, and the one side of the support wing (510) located at the front and rear of the support wing (510) of the base (500) is formed to tilt toward the other side as it moves downward. This is so that when the folding part (502) is folded, the other side of the support wing (510) located at the front and rear of the support wing (510) and the one side of the support wing (510) located at the front and rear of the support wing (510) come into contact, thereby preventing the folding of the folding part (502) from being obstructed.

[0077] Additionally, the support base (500) is formed by bending the support wing (510), so the support wing (510) has a restoring force that causes it to unfold, making installation difficult. Accordingly, the support wing (510) of the present invention is configured to include a fitting hole (512) formed through a vertical direction on one side or the other side, and a fitting projection (514) formed protruding on the other side or one side to correspond to the fitting hole of an adjacent support wing (510), with the upper and lower surfaces formed to tilt downwards as they move toward the other side or one side, and a plurality of saw-tooth shaped locking projections (514a) formed on the upper and lower surfaces to tilt upwards toward one side or the other side.

[0078] That is, the support wing (510) is inserted into the fitting hole (512) of an adjacent support wing (510) and then caught in the fitting hole (512) by the catch projection (514a), thereby preventing the restoring force that would cause it to unfold, and thus enabling the effect of easy installation on the lower part of the receiving space (110), that is, on the inner lower surface of the body (100).

[0080] The auxiliary cover (600), which is a major component of the present invention, is

[0081] One side or the other side is attached and coupled to the upper part of one side of the interior of the body (100) or the upper part of the other side of the interior of the body (100), and is formed with a length to cover the upper part of the buffer space (420), and the other side or the other side is attached and coupled to the upper part of one side of the interior partition (400) or the upper part of the other side of the interior partition (400), but is attached and coupled so as to be located lower than the one side or the other side, and is formed as a pair, and not only closes the upper part of the buffer space (420) before the inner cover (300) and the cover (200) close it, but also improves the airtightness of the buffer space (420) so that cold air generated from the side ice pack (30) can smoothly move into the interior of the receiving space (110) through the first ventilation opening (410).

[0082] These auxiliary covers (600) are made of paper material, but are made of soft cardboard to enable easy installation.

[0083] At this time, the auxiliary cover (600) is formed such that the length of the other side or the one side attached to the inner partition (400) is shorter than the length of the one side or the other side attached to the inner side of the body (100). This is to allow the auxiliary cover (600) to be attached to the body (100) first, then the side ice pack (30) to be inserted into the buffer space (420) and installed, and then the auxiliary cover (600) to be attached to the inner partition (400) more easily.

[0085] The upper box (700), which is a major component of the present invention, is

[0086] It is installed so as to be located on one side and the other side of the upper portion of the above-mentioned receiving space (110), and is installed so as to be located on the upper portion of the food pack (10). It is formed as a pair and supports the upper portion of the food pack (10) to minimize movement of the food pack (10). Additionally, an upper ice pack (40), which will be described in detail later, is installed inside, and the upper temperature of the food pack (10) is lowered by the cold air generated from the upper ice pack (40), thereby maintaining the freshness of the food.

[0087] The upper box (700) of the present invention is made of paper material, specifically hard cardboard, and is configured to include a plurality of third ventilation holes (710) through which cold air passes on the lower surface, thereby allowing cold air generated from the upper ice pack (40), which will be described in detail later, to move to the upper part of the food pack (10), while simultaneously separating the upper ice pack (40) from the food pack (10) to protect the food.

[0088] In addition, the present invention comprises an upper ice pack (40) installed inside the upper box (700), wherein the upper ice pack (40) is installed inside the upper box (700) so that the cold air generated can be transferred to the food pack (10) through the third ventilation opening (710) of the upper box (700).

[0089] Meanwhile, the upper box (700) of the present invention is configured to include a plurality of gripping holes (720) formed to be foldable on the upper surface and forming handle holes (not shown in the drawing) when folded, and the gripping holes (720) are configured to make it easy for a consumer who receives the packaging box of the present invention to easily insert their fingers into the upper box (700) to place it or remove it.

[0090] The above-mentioned gripping hole (720) has a technical feature and structure such that one side is folded and the other side has a semicircular cut-out section formed so that when a finger is inserted, the cut-out section is folded inward into the upper box (700), and when the finger is removed, the cut-out section is formed in a semi-open state. Therefore, the cold air of the upper ice pack (40) placed in the upper box (700) is discharged to the upper side of the upper box (700) minimally, and most of the cold air can be transferred to the food pack (10) through the third ventilation opening (710) of the upper box (700).

[0091] In addition, the present invention comprises a horizontal fixing box (800) installed to be located at one or more of the front or rear of the receiving space (110) and positioned at the front or rear of the food pack (10), and a vertical fixing box (810) installed to be located in the receiving space (110) and positioned above the pair of food packs (10).

[0092] The above horizontal fixing box (800) can be installed at one or more of the front or rear of the receiving space (110) depending on the size of the food pack (10), and if necessary, it can be installed at both the front and rear of the food pack (10) with a smaller thickness to realize the effect of separating the food pack (10) from the inner surface of the body (100) together with the upper box (700), base (500), and internal partition (400) so that it can be stored more safely.

[0093] The above vertical fixing box (810) is installed in the center of the food packs (10) stored on one side and the other side of the receiving space (110), respectively, to minimize movement of the food packs (10) and prevent collisions between the food packs (10) so that the food packs (10) are not damaged.

[0094] The use of the above horizontal fixing box (800) and vertical fixing box (810) is determined according to the size of the food pack (10). If the internal area of ​​the two food packs (10) matches the internal area of ​​the receiving space (110), they are omitted. If the internal area of ​​the two food packs (10) is smaller than the internal area of ​​the receiving space (110), they are installed and used in one or more of the front or rear.

[0095] In addition, the above food pack (10) can be stored by stacking at least one or two pairs between the base (500) and the upper box (700).

[0097] Meanwhile, it is preferable that a coating layer (not shown in the drawing) be formed on the inner side, inner other side, and inner lower surface of the body (100), the inner side and other side of the inner partition (400), the outer and inner surfaces of the upper box (700), and the surface of the inner cover (300) to improve water resistance. The coating layer minimizes the absorption of condensation, i.e., water droplets, caused by the cold air generated from the upper ice pack (40), lower ice pack (20), and side ice pack (30) described above, thereby preventing the durability of the body (100), inner cover (300), inner partition (400), and upper box (700) from deteriorating.

[0098] At this time, the coating layer may also be additionally formed on the base (500), that is, the coating layer may be formed on all components included inside the receiving space (110) and on the inner surface of the body (100) forming the receiving space (110), and accordingly, components whose durability may be reduced as condensation occurs and is absorbed are protected from condensation, i.e., moisture, thereby ensuring stable transportation and storage of the food pack (10).

[0099] The above coating layer is composed of Chitosan, PVOH (Poly Vinyl Alcohol), SiNPs (Silica Nanoparticles), HDIT (Hexamethylene Diisocyanate Trimer), and PDMS (Polydimethylsiloxane). At this time, the Mw of PVOH is 13,000.

[0100] Specifically, the coating layer is prepared by mixing 0.745g of chitosan, 30mL of water, and 0.372mL of acetic acid and stirring for 24 hours to make a 1.85% wt / vol chitosan solution, mixing PDMS (Polydimethylsiloxane) with acetone to make a 13.2% wt / vol PDMS (Polydimethylsiloxane) solution, mixing HDIT (Hexamethylene Diisocyanate Trimer) with acetone to make a 26.6% wt / vol HDIT (Hexamethylene Diisocyanate Trimer) solution, adding SiNPs (Silica Nanoparticles) to the chitosan solution, adding the HDIT (Hexamethylene Diisocyanate Trimer) and PDMS (Polydimethylsiloxane) solutions and stirring vigorously, and then using a mixture consisting of the SiNPs, chitosan solution, HDIT solution, and PDMS solution and 4% wt / vol A coating solution is prepared by adding PVOH (Poly Vinyl Alcohol) made with the concentration of at a 5:5 ratio, and the coating layer is formed by applying it to the surface of the composition requiring the coating layer and drying it for 24 hours.

[0101] To further explain, the HDIT constituting the coating layer plays an important role in forming urethane bonds, and the HDIT has an isocyanate group, which reacts with an amino group to form urethane bonds. The urethane bonds generated in this process provide strength and flexibility to the coating solution, thereby enabling the formation of a flexible coating layer that adheres firmly to the surface of the paper.

[0102] The coating layer of the present invention, when applied to paper, exhibits excellent hydrophobicity, can prevent moisture absorption by the paper for a long time, and enables the recycling of the paper.

[0103] The method for recycling involves cutting the paper into small pieces, soaking it in warm water for about 30 minutes, then grinding it finely using a blender, placing it in a solution of water-HCl and water-Acetic acid mixed in a 5:5 ratio, and then stirring and ultrasonic treatment to remove the coating solution from the surface of the paper.

[0104] Accordingly, the packaging box of the present invention can not only maintain the freshness of food more effectively but also be recyclable, thereby achieving an eco-friendly effect.

[0106] The above description refers to preferred embodiments of the present invention, and the present invention is not limited to the above embodiments. A person skilled in the art to which the present invention pertains may implement the invention with various modifications within the scope of the gist of the present invention without departing from the above embodiments. Explanation of the symbols

[0108] 10 : Food pack 20 : Bottom ice pack 30 : Side ice packs 40 : Top ice packs 100 : Body 110 : Storage space 200 : Cover 300 : Inner cover 310 : Insert wing 400 : Internal bulkhead 410: First ventilation opening 420: Buffer space 500 : Base 502 : Folding part 510 : Support wing 512 : Insertion hole 514 : Insertion projection 514a : Locking projection 520 : Second ventilation opening 600 : Auxiliary cover 700 : Upper box 710 : Third ventilation opening 720 : Grip hole 800 : Horizontal fixing box 810 : Vertical fixing box

Claims

Claim 1 A body (100) having an open top receiving space (110) formed therein, in which at least one pair of food packs (10) vacuum-packed with food are stored in the receiving space (110); a cover (200) attached and connected from the lower surface to the rear of the body (100), with a length formed to cover the upper part of the receiving space (110) and the front of the body (100); and an inner cover (300) with a lower part attached and connected to the rear of the receiving space (110) of the body (100), with a length formed to cover the upper part of the receiving space (110). and a pair of internal partitions (400) are attached to the front and rear of the receiving space (110) of the body (100), respectively, and form a buffer space (420) on one side and the other side of the receiving space (110), respectively; wherein the internal partitions (400) include a first ventilation opening (410) formed through the center through which cold air passes; wherein the internal partitions (400) are formed in a large rectangular shape so that the entire cold air generated from the side ice pack (30) of the first ventilation opening (410) can move directly to the food pack (10); and the inner one side, inner other side, and inner lower surface of the body (100), the one side and other side of the internal partitions (400), and the outer and inner surfaces of the upper box (700) are formed with a coating layer composed of a composition to improve water resistance, and the coating layer is composed of 0.745g of Chitosan, 30mL of water, and 0.372 A 1.85% wt / vol Chitosan solution is prepared by mixing mL of Acetic acid and stirring for 24 hours, a 13.2% wt / vol PDMS (Polydimethylsiloxane) solution is prepared by mixing PDMS (Polydimethylsiloxane) and acetone, and 26. Hexamethylene Diisocyanate Trimer (HDIT) and acetone are mixed.An eco-friendly double-layered packaging box for improving freshness preservation, characterized by preparing a 6% wt / vol HDIT (Hexamethylene Diisocyanate Trimer) solution, adding SiNPs (Silica Nanoparticles) to the Chitosan solution, adding the HDIT (Hexamethylene Diisocyanate Trimer) and PDMS (Polydimethylsiloxane) solutions and stirring vigorously, and then coating with a coating solution comprising a mixture of the SiNPs, Chitosan solution, HDIT solution, and PDMS solution, and PVOH (Poly Vinyl Alcohol) prepared at a concentration of 4% wt / vol in a 5:5 ratio. Claim 2 In claim 1, the eco-friendly double-layered packaging box for improving freshness preservation comprises: a pair of lower ice packs (20) installed by being seated on one side and the other side of the lower portion of the receiving space (110); and a pair of side ice packs (30) inserted into buffer spaces (420) formed on one side and the other side of the receiving space (110). An eco-friendly double-sided packaging box for improving freshness preservation, characterized by comprising: a folding portion (502) formed in the center, and six support wings (510) formed by being folded downwards on one side front and rear and on the other side front and rear and on the other side after being folded by the folding portion (502), and the lower portions of the six support wings (510) are installed in contact with the lower surface of the receiving space (110), wherein a lower ice pack (20) is installed so as to be positioned inside the lower side and the lower side respectively, and a food pack (10) is seated on the upper portion. Claim 3 delete Claim 4 An eco-friendly double-sided packaging box for improving freshness preservation, characterized in that, in paragraph 2, the other side of the support wing (510) located at the front and rear of one side of the support wing (510) is formed to tilt toward one side as it moves downward, and the other side of the support wing (510) located at the front and rear of the other side of the support wing (510) is formed to tilt toward the other side as it moves downward. Claim 5 In claim 1, the eco-friendly double packaging box for improving freshness preservation is characterized by comprising: a pair of auxiliary covers (600) which are attached and connected so as to be positioned higher than the one side or the other side, wherein one side or the other side is attached and connected to the upper part of the inner side of the body (100) or the upper part of the inner side of the body (100), and the length is formed to cover the upper part of the buffer space (420), and the other side or the one side is attached and connected to the upper part of the inner partition (400) or the upper part of the inner partition (400). Claim 6 An eco-friendly double packaging box for improving freshness preservation according to claim 1, characterized in that it comprises: a pair of upper boxes (700) installed to be positioned on one side and the other side of the upper portion of the receiving space (110), and installed to be positioned on the upper portion of the food pack (10); and an upper ice pack (40) installed inside the upper box (700). Claim 7 An eco-friendly double-layered packaging box for improving freshness preservation, characterized in that, in claim 6, the upper box (700) comprises a plurality of third ventilation holes (710) through which cold air passes on the lower surface; and a plurality of gripping holes (720) formed to be foldable on the upper surface and forming handle holes when folded. Claim 8 The eco-friendly double packaging box for improving freshness preservation according to claim 1 is characterized by comprising: a horizontal fixing box (800) installed to be positioned at one or more of the front or rear of the receiving space (110) and positioned at the front or rear of the food pack (10); and a vertical fixing box (810) installed to be positioned at the upper side of the food pack (10) and positioned in the receiving space (110). Claim 9 delete

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