A packaging box with heat preservation function

Abstract

This utility model discloses a packaging box with heat preservation function, including a box body with an aluminum foil reflective layer on the inner wall and an insulating liner covering the aluminum foil reflective layer to maintain a stable temperature inside the box. A lid is fitted onto the box body, with a fatty acid eutectic plate nested inside the lid. A sealing strip is provided along the perimeter of the lid edge. A pearl cotton foam groove matching the bottom size is provided in the bottom of the box body for placing a condensation pack. An absorbent sponge board is covered on the pearl cotton foam groove, and a fixed inner support is provided above the absorbent sponge board. A filling layer is provided between the fixed inner support and the fatty acid eutectic plate. This utility model uses the aluminum foil reflective layer to shield heat radiation, multiple insulating liner to reduce heat conduction, the interference fit between the sealing strip and the groove to enhance the seal, and dual cold sources to extend the low temperature time, thus comprehensively improving the heat preservation and protection performance of the packaging box.

Description

Technical Field

[0001] This utility model relates to the technical field of insulated packaging boxes, and specifically to a packaging box with heat preservation function. Background Technology

[0002] In the fresh fruit supply chain, the insulation performance of packaging boxes is a key factor in ensuring product quality and reducing spoilage and operating costs. Mainstream corrugated cardboard boxes and foam boxes primarily rely on the static insulation properties of the materials themselves. For example, corrugated cardboard boxes slow down heat conduction through air layers within the cardboard, while foam boxes utilize the closed-cell structure of materials like polystyrene to block heat transfer. However, these materials generally have high thermal conductivity and lack temperature regulation capabilities. Consequently, even when used with ice packs, their insulation time is very limited in actual logistics scenarios. Especially in high summer temperatures or long-distance transportation, ice packs melt quickly, and the internal temperature of the packaging box may rise above the suitable temperature within two hours. The ideal storage temperature is 8-12℃, while ordinary packaging boxes experience a rapid temperature rise in an environment of 30℃. Considering the complexity of logistics transit and last-mile delivery, such as the possibility that multiple loading and unloading during transit may damage the sealing of the packaging box, and the vehicle parking location during last-mile delivery (such as exposure to the sun) will accelerate heat penetration. Once traditional packaging boxes are removed from the refrigerated environment, the time for temperature runaway will be significantly shortened. In scenarios where fresh fruits using ordinary packaging boxes have a transit time of more than 1 hour or a last-mile delivery time of more than 2 hours in summer, the spoilage rate can be as high as 15%-20%. The resulting returns and complaints not only directly increase the merchant's costs but also damage the brand reputation, creating a vicious cycle. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a packaging box with heat insulation function. An aluminum foil reflective layer on the inner wall of the box reflects external heat back, forming a heat radiation shield. This solves the problem of traditional packaging boxes relying on the static insulation properties of materials and lacking heat radiation shielding capabilities, thus slowing down the penetration of external heat into the box and reducing the impact of heat radiation on the internal temperature. The inner rock wool insulation layer reduces molecular heat transfer and lowers heat conduction efficiency; the middle polyurethane foam layer provides heat insulation and moisture protection; and the outer fiberglass cloth layer enhances the box's strength and prevents collapse. This addresses the problems of high thermal conductivity and insufficient strength of traditional materials, improving insulation performance and structural stability, and extending the box's pressure resistance and insulation life during logistics. A rubber or silicone sealing strip along the circumference of the lid fits tightly with the groove in the box body, forming a sealed connection. This solves the problem of easily damaged packaging box seals during transshipment, loading, unloading, or last-mile delivery, further reducing heat penetration and cold loss. This product enhances temperature stability within the box. A double-layered cold source, formed by a fatty acid eutectic plate nested inside the lid and a condensation pack at the bottom, solves the problems of rapid cold release and limited insulation time associated with traditional ice packs. It maintains a refrigerated temperature for over two hours after removal from the refrigeration system, extending the duration of low-temperature transportation. The combination of a condensation pack (ice pack) placed in a pearl cotton foam groove at the bottom of the box and an absorbent sponge absorbs condensation, preventing water accumulation from affecting the fruit storage environment and keeping the box dry, thus reducing the impact of humidity fluctuations on fruit quality. The grooves securing the inner tray and the breathable microporous EPE foam filling layer prevent damage from shaking during transportation, securing the fruit, reducing mechanical damage, and lowering the spoilage rate. The box and lid are secured with straps or tape, preventing the box from being easily opened during logistics and thus enhancing stability and sealing, ensuring temperature control and fruit protection during transport.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A heat-insulating packaging box includes a box body with an aluminum foil reflective layer on its inner wall to reflect heat from the external environment, forming a heat radiation shield. An insulating liner covers the aluminum foil reflective layer to maintain a stable temperature inside the box. A lid is fitted onto the box body, and a fatty acid eutectic plate is nested inside the lid to maintain the packaging box at a refrigeration temperature for at least two hours after removal from refrigeration. A sealing strip is provided along the circumference of the lid to seal the connection between the lid and the box body. The box includes a lid; a foam plastic tray with a diameter matching the bottom size is provided at the bottom of the box for holding a condensation pack; an absorbent sponge board is provided on the foam plastic tray to absorb condensation; a fixed inner tray is provided above the absorbent sponge board to wrap and secure the packaged items; the fixed inner tray has several recesses, which are semi-enclosed hemispherical or bowl-shaped; a filling layer is provided between the fixed inner tray and the fatty acid eutectic plate to fill the gaps in the box.

[0005] The box body and the lid are secured together by packing straps or adhesive tape.

[0006] The filling layer is an EPE foam filler with breathable micropores.

[0007] The box body is made of high-strength corrugated cardboard with a thickness of 10mm, and the aluminum foil reflective layer has a thickness of 0.1-0.3mm, which is fixed to the inner wall of the box body with polyurethane adhesive.

[0008] The thermal insulation lining includes an inner rock wool insulation layer, a middle polyurethane foam layer, and an outer fiberglass cloth layer. The rock wool insulation layer is used to reduce the transfer of molecular heat movement and reduce the heat conduction efficiency inside the box. The polyurethane foam layer is used for heat insulation and sealing and moisture prevention. The fiberglass cloth layer is used to enhance the strength of the box and prevent the box from collapsing.

[0009] The rock wool insulation layer, polyurethane foam layer, and fiberglass cloth layer are bonded and fixed together with adhesives.

[0010] The sealing strip is made of either rubber or silicone, and it is interference-fitted with the mounting groove of the box cover.

[0011] The dimensions (length × width × height) of the box body are 250mm × 150mm × 100mm, and the dimensions of the pearl cotton foam plastic trough are 225mm × 125mm × 20mm. It has two grooves inside, in which a condenser bag with dimensions of 100mm × 60mm × 15mm is placed. The thickness of the plate fixing the inner support is 50mm, and there are 6 recesses in total, with a diameter of 75mm and a depth of 20mm.

[0012] The dimensions (length × width × height) of the box body are 350mm×250mm×150mm, the dimensions of the pearl cotton foam plastic tank body are 325mm×225mm×25mm, and 4 grooves are arranged inside, and condensation packs with dimensions of 150mm×70mm×20mm are placed in the grooves, distributed in a "grid" shape. The plate thickness of the fixing inner support is 55mm, 4×4 totally 16 sockets are opened, the diameter of the socket is 78mm, and the depth is 24mm. A buffer partition plate is arranged on the fixing inner support, and the dimensions of the buffer partition plate are 326mm×226mm×10mm.

[0013] The dimensions (length × width × height) of the box body are 450mm×350mm×200mm, the dimensions of the pearl cotton foam plastic tank body are 425mm×325mm×30mm, and 6 grooves are arranged inside, and condensation packs with dimensions of 140mm×80mm×25mm are placed in the grooves. The plate thickness of the fixing inner support is 60mm, 4×8 totally 32 sockets are opened, the diameter of the socket is 80mm, and the depth is 25mm. A buffer partition plate is arranged on the fixing inner support, and the dimensions of the buffer partition plate are 426mm×326mm×15mm.

[0014] The beneficial effects of the present utility model are: 1. The aluminum foil reflective layer arranged on the inner wall of the box body reflects the heat of the external environment back to form a heat radiation shield, which achieves the effect of slowing down the penetration of external heat into the box, reduces the influence of heat radiation on the temperature inside the box. Through the inner rock wool insulation layer of the thermal insulation inner liner, the transmission of molecular thermal motion is reduced to lower the heat conduction efficiency, the middle polyurethane foam layer realizes heat insulation, thermal insulation, sealing and moisture protection, and the outer glass fiber cloth layer enhances the strength of the box body and prevents collapse, which achieves the effect of improving thermal insulation performance and structural stability, prolongs the pressure resistance and thermal insulation service life of the box body in logistics. The rubber or silica gel sealing strip arranged along the perimeter at the edge of the box cover forms a sealed connection through interference fit with the groove of the box body, which achieves the effect of reducing heat penetration and cold loss, and improves temperature stability; 2. The double-layer cold source formed by the fatty acid eutectic plate nested in the box cover and the condensation pack at the bottom of the box body achieves the effect of maintaining the refrigeration temperature for more than two hours after being separated from cold storage, and prolongs the low-temperature transportation time. The combination of the condensation pack (ice bag) placed in the pearl cotton foam plastic tank body at the bottom of the box body and the absorbent sponge plate that absorbs condensed water achieves the effect of keeping the inside of the box dry and reducing the influence of humidity changes on fruit quality; 3. The sockets of the fixing inner support and the breathable microporous EPE foam filler of the filling layer achieve the effect of fixing fruits and reducing mechanical damage, and reduce the rate of bad fruits; the box body and the box cover are fastened by packing straps or adhesive tape bonding, which achieves the effect of enhancing the stability and sealing performance of the packaging box, and ensures temperature control and fruit protection during transportation. Description of Drawings

[0015] Figure 1This is a perspective view of the present invention.

[0016] Figure 2 This is a cross-sectional view of the present invention.

[0017] Figure 3 This is an exploded view of one embodiment of this utility model.

[0018] Figure 4 This is a perspective view of the box lid of this utility model.

[0019] Figure 5 This is an exploded view of Embodiment 2 of this utility model.

[0020] Figure 6 This is an exploded view of Embodiment 3 of this utility model.

[0021] Explanation of icon numbers: 1-Box body, 10-Aluminum foil reflective layer, 2-Box cover, 20-Mounting groove, 21-Sealing strip, 3-Insulation lining, 30-Rock wool insulation layer, 31-Polyurethane foam layer, 32-Fiberglass cloth layer, 4-Fatty acid eutectic board, 5-Emulsion foam plastic tank, 50-Groove, 6-Condensation bag, 7-Water-absorbing sponge board, 8-Fixed inner support, 80-Groove, 9-Filling layer, 1A-Buffer partition. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings: like Figure 1-6As shown, this utility model relates to a packaging box with heat preservation function. In one embodiment, the packaging box is suitable for storing approximately 4-6 fruits weighing about 1 kg. The packaging box includes a box body 1 with dimensions (length × width × height) of 250mm × 150mm × 100mm. The box body 1 is made of high-strength corrugated cardboard with a thickness of 10mm. The inner wall of the box body 1 is provided with an aluminum foil reflective layer 10, which is used to reflect heat from the external environment to form a heat radiation shield. The aluminum foil reflective layer 10 has a thickness of 0.1-0.3mm and is fixed to the inner wall of the box body with polyurethane adhesive. An insulating liner 3 is wrapped around the aluminum foil reflective layer 10. The inner lining 3 is used to maintain a stable temperature inside the box. This insulating lining 3 includes an inner rock wool insulation layer 30, a middle polyurethane foam layer 31, and an outer fiberglass cloth layer 32. The rock wool insulation layer 30 reduces molecular heat transfer, lowering the heat conduction efficiency inside the box. The polyurethane foam layer 31 provides heat insulation and moisture protection. The fiberglass cloth layer 32 enhances the box's strength and prevents collapse. The rock wool insulation layer 30, polyurethane foam layer 31, and fiberglass cloth layer 32 are bonded together with adhesives. A lid 2 is fitted onto the box body 1, and a fatty acid eutectic plate 4 is nested inside the lid 2. The fatty acid eutectic plate 4 is used for... To ensure the packaging box maintains a refrigerated temperature for at least two hours after being removed from the refrigerator, a sealing strip 21 is provided along the circumference of the lid 2. This sealing strip 21 is used to seal and connect the box body 1 and the lid 2. The sealing strip 21 is made of either rubber or silicone and is press-fitted into the mounting groove 20 of the lid 2. A pearl cotton foam plastic groove 5, matching the dimensions of the box bottom, is provided inside the bottom of the box body 1. This pearl cotton foam plastic groove 5 is used to hold the condenser pack 6. The pearl cotton foam plastic groove 5 measures 225mm × 125mm × 20mm and has two recesses 50. Two sets of condenser packs measuring 100mm × 60mm × 15mm are placed in these recesses 50. The packaging consists of a condensation box 6; an absorbent sponge board 7 covers the pearl cotton foam plastic tank 5 to absorb condensation; a fixed inner support 8 is provided above the absorbent sponge board 7 to wrap and fix the packaged item; the fixed inner support 8 is 50mm thick and has 6 recesses 80 (2×3), each 75mm in diameter and 20mm deep, and is semi-enclosed in a hemispherical or bowl shape; a filling layer 9 is provided between the fixed inner support 8 and the fatty acid eutectic plate 4 to fill the gaps in the box body 1; the filling layer 9 is an EPE foam filler with breathable micropores; the box body 1 and the box lid 2 are fastened together by packing straps or tape.

[0023] like Figure 1-2As shown in Figs. 4-5, in the second embodiment, the packaging box is suitable for storing about 2.5 Kg of fruits, with the number of fruits ranging from about 16 to 32. The packaging box comprises a box body 1, wherein the size (length×width×height) of the box body 1 is 350mm×250mm×150mm, the box body 1 is made of high-strength corrugated cardboard with a thickness of 10 mm; the inner wall of the box body 1 is provided with an aluminum foil reflective layer 10, the aluminum foil reflective layer 10 is used for reflecting heat from the external environment to form a thermal radiation shield, and the aluminum foil reflective layer 10 has a thickness of 0.1-0.3 mm and is fixed on the inner wall of the box body through a polyurethane adhesive; a thermal insulation inner liner 3 is coated outside the aluminum foil reflective layer 10, the thermal insulation inner liner 3 is used for maintaining stable temperature inside the box body, the thermal insulation inner liner 3 comprises a rock wool thermal insulation layer 30 arranged on the inner layer, a polyurethane foam layer 31 arranged on the middle layer and a glass fiber cloth layer 32 arranged on the outer layer, the rock wool thermal insulation layer 30 is used for reducing the heat transfer by molecular thermal motion to lower the heat conduction efficiency inside the box body, the polyurethane foam layer 31 is used for heat insulation, thermal preservation, sealing and moisture protection, the glass fiber cloth layer 32 is used for enhancing the strength of the box body and preventing the box body from collapsing, and all layers of the rock wool thermal insulation layer 30, the polyurethane foam layer 31 and the glass fiber cloth layer 32 are bonded and fixed by an adhesive respectively; a box cover 2 is covered on the box body 1, a fatty acid eutectic plate 4 is nested in the box cover 2, the fatty acid eutectic plate 4 is used for enabling the packaging box to maintain a refrigerated temperature for more than two hours after being separated from cold storage; a sealing strip 21 is arranged along the perimeter of the cover edge of the box cover 2, the sealing strip 21 is used for sealing and connecting the box body 1 and the box cover 2, the sealing strip 21 is made of one of rubber and silica gel, and the sealing strip 21 is in interference fit with the mounting groove 20 of the box cover 2; an EPE pearl cotton foam plastic tank 5 matching the size of the box bottom is arranged at the inner bottom of the box body 1, the EPE pearl cotton foam plastic tank 5 is used for placing cold packs 6, the EPE pearl cotton foam plastic tank 5 has a size of 325mm×225mm×25mm and is provided with four grooves 50 inside, four groups of cold packs 6 with a size of 150mm×70mm×20mm in total are placed in the grooves 50 and distributed in a "grid (tian-shaped)" layout; a water-absorbent sponge plate 7 covers the EPE pearl cotton foam plastic tank 5, the water-absorbent sponge plate 7 is used for absorbing condensed water; two groups of stacked fixed inner supports 8 are arranged above the water-absorbent sponge plate 7, the fixed inner supports 8 are used for wrapping and fixing packaged objects, the fixed inner supports 8 have a plate thickness of 55 mm, and are provided with 4×4, a total of 16, nest grooves 80, the nest grooves 80 have a diameter of 78 mm and a depth of 24 mm, the nest grooves 80 are semi-enclosed hemispherical or bowl-shaped, a buffer partition plate 1A is arranged between the first layer of fixed inner support 8 and the second layer of fixed inner support 8, and the buffer partition plate 1A has a size of 326mm×226mm×10mm; a filling layer 9 is arranged on the second layer of fixed inner support 8, the filling layer 9 is used for filling the gap in the box body 1, and the filling layer 9 is an EPE foam filler with breathable micropores; the box body 1 and the box cover 2 are fastened by binding with packing belts or adhesive tape bonding.

[0024] As Figure 1-2As shown in Figures 4 and 6, in Embodiment 3, the packaging box is suitable for storing approximately 32-64 fruits weighing about 5 kg. The packaging box includes a box body 1 with dimensions (length × width × height) of 450mm × 350mm × 200mm. The box body 1 is made of high-strength corrugated cardboard with a thickness of 10mm. An aluminum foil reflective layer 10 is provided on the inner wall of the box body 1. This aluminum foil reflective layer 10 is used to reflect heat from the external environment back, forming a heat radiation shield. The thickness of the aluminum foil reflective layer 10 is 0.1-0.3mm, and it is fixed to the inner wall of the box body using polyurethane adhesive. An insulating liner 3 is wrapped around the aluminum foil reflective layer 10 to maintain a stable temperature inside the box. The insulating liner 3 includes… The box body 1 comprises an inner rock wool insulation layer 30, a middle polyurethane foam layer 31, and an outer fiberglass cloth layer 32. The rock wool insulation layer 30 reduces molecular heat transfer and lowers the heat conduction efficiency within the box. The polyurethane foam layer 31 provides heat insulation and moisture protection. The fiberglass cloth layer 32 enhances the box's strength and prevents collapse. Each of the rock wool insulation layer 30, polyurethane foam layer 31, and fiberglass cloth layer 32 is bonded together with adhesive. A lid 2 covers the box body 1, and a fatty acid eutectic plate 4 is nested inside the lid 2. The fatty acid eutectic plate 4 allows the packaging box to maintain a refrigerated temperature for at least two hours after being removed from the refrigeration unit. The lid 2 has a lid edge along... A sealing strip 21 is provided around the perimeter to seal the connection between the box body 1 and the box cover 2. The sealing strip 21 is made of either rubber or silicone and is press-fitted into the mounting groove 20 of the box cover 2. A pearl cotton foam plastic groove 5, matching the dimensions of the box bottom, is provided at the bottom of the box body 1. This groove 5 is used to place the condensate pack 6. The pearl cotton foam plastic groove 5 measures 425mm × 325mm × 30mm and has six recesses 50. Each recess 50 contains a condensate pack 6 measuring 140mm × 80mm × 25mm. An absorbent sponge board 7 covers the pearl cotton foam plastic groove 5 to absorb condensate. Above the cotton board 7 are two sets of stacked fixed inner trays 8, which are used to wrap and fix the packaged items. The fixed inner tray 8 is 60mm thick and has 32 recesses 80 (4×8). The recesses 80 are 80mm in diameter and 25mm deep. The recesses 80 are semi-enclosed hemispherical or bowl-shaped. A buffer partition 1A is provided between the first layer of fixed inner trays 8 and the second layer of fixed inner trays 8. The buffer partition 1A has dimensions of 426mm×326mm×15mm. A filling layer 9 is provided on the second layer of fixed inner trays 8. The filling layer 9 is used to fill the gaps in the box body 1. The filling layer 9 is EPE foam with breathable micropores. The box body 1 and the box lid 2 are fastened by packing straps or tape.

[0025] It should be noted that in the above embodiments, the fatty acid eutectic plate 4 achieves temperature regulation inside the box through the eutectic reaction of fatty acids. When the fatty acids in the fatty acid eutectic plate 4 are pre-cooled to below 0°C in the cold chamber, they are completely solidified, forming a double-layer cold source with the condenser pack 6 placed at the bottom of the box and the fatty acid eutectic plate 4. The aluminum foil reflective layer 10 blocks external heat from the outer layer of the box 1, and the remaining slowly penetrating heat is absorbed by the fatty acid eutectic plate 4. A stable cold source is formed inside the box with the fatty acid eutectic plate 4 and the condenser pack 6, so that the respiration heat of the fruit and the heat permeating through the wall are absorbed by the solid-liquid phase change of the fatty acids. Before the cold energy of the condenser pack 6 is completely released, the fruit temperature is always maintained at the refrigeration and preservation temperature, realizing low-temperature transportation without interruption for more than 2 hours. The condenser pack 6 is an ice pack, and the ice pack is sealed with dry ice or ice cubes.

[0026] The above description is only a preferred embodiment of the present utility model and is not intended to limit the scope of the present utility model. Therefore, without departing from the design spirit of the present utility model, any equivalent changes or modifications made by those skilled in the art to the structure, features and principles of the present utility model should fall within the protection scope of the patent application of the present utility model.

Claims

1. A packaging box with heat preservation function, comprising a box body, characterized in that: An aluminum foil reflection layer is arranged on the inner wall of the box body, and the aluminum foil reflection layer is used for reflecting heat from the external environment to form a thermal radiation shield; a heat preservation lining is coated outside the aluminum foil reflection layer, and the heat preservation lining is used for maintaining temperature stability inside the box body; a box cover is covered on the box body, a fatty acid eutectic plate is nested in the box cover, and the fatty acid eutectic plate is used for maintaining a refrigerated temperature for more than 2 hours after the packing box is separated from refrigeration; a sealing strip is arranged along the circumference at the edge of the box cover, and the sealing strip is used for sealing and connecting the box body and the box cover; an EPE pearl cotton foam plastic groove body matched with the size of the box bottom is arranged at the inner bottom of the box body, and the pearl cotton foam plastic groove body is used for placing condensation packages; a water-absorbing sponge plate covers the pearl cotton foam plastic groove body, and the water-absorbing sponge plate is used for absorbing condensed water; a fixing inner support is arranged above the water-absorbing sponge plate, the fixing inner support is used for wrapping and fixing a package, a plurality of nest grooves are formed in the fixing inner support, and the nest grooves are semi-enclosed hemispherical or bowl-shaped; a filling layer is arranged between the fixing inner support and the fatty acid eutectic plate, and the filling layer is used for filling gaps in the box body.

2. A packaging box with heat preservation function according to claim 1, characterized in that: The box body and the box cover are fastened by binding with a packing belt or bonding with an adhesive tape.

3. A packaging box with heat preservation function according to claim 1, characterized in that: The filling layer is an EPE foam filler with breathable micropores.

4. A packaging box with heat preservation function according to claim 1, characterized in that: The box body is made of high-strength corrugated cardboard with a thickness of 10mm, and the aluminum foil reflection layer has a thickness of 0.1-0.3mm and is fixed on the inner wall of the box body through a polyurethane adhesive.

5. A packaging box with heat preservation function according to claim 1, characterized in that: The heat preservation lining comprises a rock wool heat preservation layer arranged on an inner layer, a polyurethane foam layer arranged on a middle layer and a glass fiber cloth layer arranged on an outer layer, wherein the rock wool heat preservation layer is used for reducing molecular heat movement transfer to lower the heat conduction efficiency in the box body, the polyurethane foam layer is used for heat insulation, heat preservation, sealing and moisture protection, and the glass fiber cloth layer is used for enhancing the strength of the box body and preventing the box body from collapsing.

6. A packaging box with heat preservation function according to claim 5, characterized in that: The rock wool heat preservation layer, the polyurethane foam layer and the glass fiber cloth layer are bonded and fixed with each other through an adhesive respectively.

7. A packaging box with heat preservation function according to claim 1, characterized in that: The sealing strip is made of one of rubber and silica gel, and the sealing strip is in interference fit with an installation groove of the box cover.

8. A packaging box with heat preservation function according to claim 1, characterized in that: The size of the box body is 250mm×150mm×100mm, the size of the pearl cotton foam plastic groove body is 225mm×125mm×20mm, 2 grooves are arranged inside the groove body, the condensation packages with the size of 100mm×60mm×15mm are placed in the grooves, the plate thickness of the fixing inner support is 50mm, 2×3 that is 6 nest grooves are formed, the diameter of each nest groove is 75mm, and the depth of the nest groove is 20mm.

9. A packaging box with heat preservation function according to claim 1, characterized in that: The size of the box body is 350mm×250mm×150mm, the size of the pearl cotton foam plastic groove body is 325mm×225mm×25mm, 4 grooves are arranged inside the groove body, the condensation packages with the size of 150mm×70mm×20mm are placed in the grooves and distributed in a "field" shape, the plate thickness of the fixing inner support is 55mm, 4×4 that is 16 nest grooves are formed, the diameter of each nest groove is 78mm, the depth of the nest groove is 24mm, a buffer partition plate is arranged on the fixing inner support, and the size of the buffer partition plate is 326mm×226mm×10mm.

10. A packaging box with heat preservation function according to claim 1, characterized in that: The box body measures 450mm×350mm×200mm, and the pearl cotton foam plastic tank measures 425mm×325mm×30mm. It has 6 grooves inside, in which a condenser bag measuring 140mm×80mm×25mm is placed. The inner support plate is 60mm thick and has 32 recesses (4×8) with a diameter of 80mm and a depth of 25mm. The inner support plate is equipped with a buffer plate measuring 426mm×326mm×15mm.

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