Environment-friendly food packaging box structure with degradable buffer liner

Abstract

The application relates to the field of food packaging boxes, in particular to an environment-friendly food packaging box structure with degradable buffer inner liner, which comprises a paper box and four folding ears, the four folding ears are integrally formed and installed around the top of the paper box, the paper box is sealed by folding the folding ears, supporting mechanisms are uniformly installed at the bottom of the inner cavity of the paper box, the supporting mechanisms are used for storing food with different volumes, locators are installed at the surface edges of the two folding ears on the left and right sides, a traction member is installed at the top of the rear side of the paper box, a tensile mechanism is embedded in the top of the front side of the paper box, the traction member is wound back and forth on the two locators, the traction member is fixed with the tensile mechanism, and the paper box is sealed. The self-adaptive buffering and fixed protection of food with different sizes and different volumes can be realized, special inner liners are not needed, the packaging requirements of multiple categories and complete sets of food can be met, the packaging form is flexible and various, and the packaging adaptability and practicability are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of food packaging box technology, specifically to an environmentally friendly food packaging box structure with a biodegradable cushioning liner. Background Technology

[0002] Food packaging boxes serve as the core protective carrier for food transportation and storage. Their pressure resistance and shock resistance directly ensure the integrity of food during logistics handling and long-distance transportation. For glass bottled food, an inner lining structure needs to be added to the packaging box to separate and fix the bottle body, preventing damage caused by collisions between the bottles during transportation and handling.

[0003] The lining of existing food packaging boxes mainly uses pearl cotton and grid cardboard as the core materials. Such lining has significant limitations: it can only be used with food glass bottles of uniform size, and cannot meet the flexible packaging needs of selling in sets or selecting and matching multiple categories. The packaging form is monotonous and it is difficult to match diversified consumption scenarios and personalized purchasing needs.

[0004] In terms of sealing methods, existing packaging boxes generally use tape to stick flaps to achieve sealing. When removing the tape, the flaps are easily torn and the box body is damaged, making the packaging boxes unusable. At the same time, the extensive use of tape and non-degradable linings not only wastes packaging resources but also causes environmental pollution. Neither environmental protection nor reusability can meet the development requirements of green packaging. Summary of the Invention

[0005] The purpose of this invention is to provide an environmentally friendly food packaging box structure with a biodegradable cushioning liner, in order to solve the problems mentioned in the background art, such as the limited variety of packaged foods, difficulty in meeting consumer needs, the risk of damage from the sealing method, and the inability to reuse the packaging box.

[0006] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions: An environmentally friendly food packaging box structure with a biodegradable cushioning liner includes a cardboard box and four flaps. The four flaps are integrally formed and installed around the top of the cardboard box. The cardboard box is sealed by folding the flaps. Support mechanisms are evenly installed at the bottom of the inner cavity of the cardboard box to store food of different volumes. Positioners are installed on the edges of the two flaps on the left and right sides. A traction component is installed on the top rear side of the cardboard box, and an anti-tensile mechanism is embedded in the top front side of the cardboard box. The traction component winds back and forth on the two positioners and fixes the traction component to the anti-tensile mechanism to achieve sealing of the cardboard box. The support mechanism includes a box body installed at the bottom of the inner cavity of the carton. Clamping components are installed on all four sides of the inner wall of the box body. A base plate is installed at the bottom of the inner wall of the box body. Through holes perpendicular to the inner wall of the carton are opened on all four sides of the upper surface of the base plate. A driving component is inserted into the center of the base plate. The driving component supports the food and can pull the clamping components at the same time.

[0007] As a further embodiment of the present invention, the clamping assembly includes a supporting cardboard installed on the inner wall of the carton, an inner liner installed on the top inner side of the supporting cardboard, and a top plate installed on the bottom end of the supporting cardboard; The folded support cardboard provides clamping force to hold and protect food glass bottles, preventing damage during transportation or handling.

[0008] As a further embodiment of the present invention, the supporting cardboard is provided with multiple creases at equal intervals from top to bottom, and the topmost crease on the outer wall of the supporting cardboard is installed with the inner lining.

[0009] As a further embodiment of the present invention, the driving component includes a limiting post inserted into the center of the base plate. A locking block is installed on the outer wall of the limiting post, which is locked onto the upper surface of the base plate to prevent the limiting post from descending. A base is installed at the top of the limiting post to support the food. One end of a first connecting rod is installed around the bottom of the outer wall of the limiting post via a pin. A second connecting rod is installed around the bottom of the inner cavity of the box via a pin. One end of the second connecting rod is connected to the other end of the first connecting rod via a pin, and the other end of the second connecting rod is connected to the bottom of the top plate via a pin. Using the weight of the food as the clamping force not only makes it easier to place food glass bottles, but also automatically controls the clamping force according to the weight of the food.

[0010] As a further embodiment of the present invention, the second connecting rod shaft contact point is close to the limiting post.

[0011] As a further embodiment of the present invention, the locator includes a positioning strip mounted on the upper surface of the folded ear, the upper surface of the positioning strip having a plurality of grooves from front to back, and a plug being installed in the inner cavity of the groove.

[0012] As a further embodiment of the present invention, the traction component includes one end of a pull rope tied to the top rear side of the carton, the pull rope being wound around the outer wall of the plug to lock two opposing left and right folding ears, and a plurality of pull beads being installed at equal intervals on the other end of the pull rope.

[0013] As a further embodiment of the present invention, the tensile mechanism includes a mounting plate embedded in the top front side of the carton. Several expansion rods are installed sequentially from top to bottom on the left and right sides of the mounting plate. The expansion rods enhance the tensile strength of the mounting plate. The front of the mounting plate has two symmetrical slide rails. Clamping components are slidably connected to the inner cavity of the slide rails, and the two clamping components are symmetrical. The pull cord is positioned to replace the traditional tape sealing, allowing the cardboard boxes to be reused and making them more environmentally friendly.

[0014] As a further embodiment of the present invention, the slide rails are distributed obliquely outward from top to bottom on the outer wall of the mounting plate.

[0015] As a further embodiment of the present invention, the clamping assembly includes a slider slidably connected to the inner cavity of the slide, a clamping plate is installed on the outer wall of the slider, a through groove is opened on the inner side of the clamping plate for clamping the pull rope, and positioning grooves communicating with the through grooves are opened at equal intervals from top to bottom on the inner side of the clamping plate, and the positioning grooves are for storing pull beads.

[0016] As a further embodiment of the present invention, the lining is made of toughened modified polylactic acid foam biodegradable cushioning material. The toughened modified polylactic acid foam material uses L-polylactic acid with a molecular weight of 80,000-120,000 as the matrix resin, adds 8%-12% polybutylene adipate / terephthalate (PBAT) as a bio-based toughening agent, 2%-4% nanocellulose whiskers as a nucleating reinforcing agent, and 0.8%-1.5% tributyl acetylacetate as an environmentally friendly plasticizer, and is prepared by supercritical carbon dioxide intermittent foaming process.

[0017] Compared with the prior art, the beneficial effects of the embodiments of the present invention are: 1. This invention adopts a gravity-driven adaptive clamping structure. After the food is placed, it presses down on the base by its own weight. Through the linkage of the first and second connecting rods, the top plate moves upward, causing the creased support cardboard to gradually fold along the creases and increase in width. This pushes the inner liner closer to the center and fits against the outer wall of the food. It can achieve adaptive buffering and fixed protection for foods of different sizes and volumes. There is no need to customize special inner liners. It can meet the packaging needs of multi-category and set combination foods. The packaging form is flexible and diverse, greatly improving the adaptability and practicality of the packaging.

[0018] 2. This invention uses a pull rope wrapped around the left and right side latches and a pull bead inserted into the positioning groove. With the help of the sealing traction force, the clamping plate slides and closes along the slide. The pull rope is clamped by the through groove to achieve a firm seal, completely replacing the traditional tape sealing method. This effectively avoids damage to the ear flaps when the tape is torn off, allowing the packaging box to be recycled and reused multiple times, reducing packaging costs. At the same time, it eliminates tape and non-degradable materials, and with the all-paper biodegradable structure, it significantly improves the environmental friendliness of the packaging, which is in line with the concept of green packaging development. Attached Figure Description

[0019] Figure 1 This is a perspective view of the present invention; Figure 2 This is a perspective view of the packaging of the present invention; Figure 3 This is a front sectional view of the support mechanism of the present invention; Figure 4 This is a perspective view of the clamping component of the present invention; Figure 5 For the present invention Figure 2 Enlarged view of point A in the middle; Figure 6 This is a perspective view of the traction component of the present invention; Figure 7 This is a perspective view of the tensile strength mechanism of the present invention; Figure 8 This is a perspective view of the clamping component of the present invention.

[0020] In the diagram: 1. Carton; 2. Folding ear; 3. Support mechanism; 4. Positioner; 5. Traction component; 6. Tensile mechanism; 31. Box body; 32. Clamping assembly; 33. Base plate; 34. Through hole; 35. Drive assembly; 321. Supporting cardboard; 322. Liner; 323. Top plate; 351. Limiting post; 352. Locking block; 353. Base; 354. First connecting rod; 355. Second connecting rod; 41. Positioning strip; 42. Groove; 43. Bolt; 51. Pull rope; 52. Pull bead; 61. Mounting plate; 62. Expansion rod; 63. Slide rail; 64. Clamping assembly; 641. Slider; 642. Clamping plate; 643. Through groove; 644. Positioning groove. Detailed Implementation

[0021] The technical solution of this patent will be further described in detail below with reference to specific embodiments.

[0022] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0023] Please see Figures 1-8 In this embodiment of the invention, an environmentally friendly food packaging box structure with a biodegradable cushioning liner includes a cardboard box 1 and four flaps 2. The four flaps 2 are integrally formed and installed around the top of the cardboard box 1. The cardboard box 1 is sealed by folding the flaps 2. Support mechanisms 3 are evenly installed at the bottom of the inner cavity of the cardboard box 1. The support mechanisms 3 are used to store food of different volumes. Positioners 4 are installed on the edges of the two flaps 2 on the left and right sides. A traction member 5 is installed on the top rear side of the cardboard box 1. A tensile mechanism 6 is embedded in the top front side of the cardboard box 1. The traction member 5 is wound back and forth on the two positioners 4 and fixed to the tensile mechanism 6 to achieve sealing of the cardboard box 1. The support mechanism 3 includes a box body 31 installed at the bottom of the inner cavity of the carton 1. Clamping components 32 are installed around the inner wall of the box body 31. A base plate 33 is installed at the bottom of the inner wall of the box body 31. Through holes 34 perpendicular to the inner wall of the carton 1 are opened around the upper surface of the base plate 33. A drive component 35 is inserted into the center of the base plate 33. The drive component 35 supports the food and can pull the clamping components 32. The box body 31, clamping components 32, base plate 33 and drive component 35 are all made of paper environmentally friendly materials.

[0024] Furthermore, the clamping assembly 32 includes a support cardboard 321 installed on the inner wall of the carton 1. An inner liner 322 is installed on the top inner side of the support cardboard 321. The inner liner 322 has a certain elasticity to cushion the food glass bottle. A top plate 323 is installed at the bottom of the support cardboard 321. The support cardboard 321 has multiple folds evenly spaced from top to bottom. The topmost fold on the outer wall of the support cardboard 321 is installed with the inner liner 322. As the top plate 323 presses the support cardboard 321 upward, the support cardboard 321 gradually folds under the action of the folds. The purpose is to increase the width of the support cardboard 321 and allow the inner liner 322 to move inward.

[0025] When the top plate 323 is subjected to upward pressure, the support cardboard 321 is gradually folded along the preset crease. During the folding process, the lateral width of the support cardboard 321 continues to increase, which in turn drives the inner lining 322 at the top crease to move towards the center of the box until the inner lining 322 is tightly attached to the outer wall of the food, thus completing the adaptive clamping and buffering fixation of the food.

[0026] The support cardboard 321 features an equidistant crease design, ensuring a controllable deformation path and stable clamping action. It can achieve adaptive clamping without external power. The inner liner 322 is located at the top crease of the support cardboard 321, providing higher precision in food contact and better cushioning protection. It can effectively prevent glass bottle food from being damaged during transportation. It can automatically adjust the clamping range according to the shape and size of the food, making it compatible with different specifications and multiple types of food packaging, significantly improving its versatility and adaptability.

[0027] Furthermore, the drive assembly 35 includes a limiting post 351 inserted into the center of the base plate 33. The limiting post 351 is rectangular to improve movement stability. A locking block 352 is installed on the outer wall of the limiting post 351, which locks onto the upper surface of the base plate 33 to prevent the limiting post 351 from descending. A base 353 is installed at the top of the limiting post 351. The base 353 is horizontally positioned and has an anti-slip pad on its upper surface for stable support of the food. The bottom of the outer wall of the limiting post 351 is equipped with a first pin on all four sides. One end of the connecting rod 354 and the bottom of the inner cavity of the box 31 are all equipped with a second connecting rod 355 by means of a pin. One end of the second connecting rod 355 is connected to the other end of the first connecting rod 354 by means of a pin. The other end of the second connecting rod 355 is connected to the bottom end of the top plate 323 by means of a pin. The shaft contact of the second connecting rod 355 is close to the limiting post 351. When the limiting post 351 drives the first connecting rod 354 to descend, the first connecting rod 354 moves a small distance, which amplifies the distance that the second connecting rod 355 pulls the top plate 323 to rise.

[0028] After the food is placed on the base 353, it presses down on the base 353 by its own weight, causing the limiting post 351 to move vertically downward. The limiting post 351 drives the first connecting rod 354 to move downward. The first connecting rod 354 pulls the second connecting rod 355 to swing upward around the fulcrum. Through the mechanical amplification effect, the small downward movement of the limiting post 351 is transformed into a large upward movement of the top plate 323, thereby driving the clamping assembly 32 to complete the adaptive clamping of the food.

[0029] Furthermore, the locator 4 includes a locating strip 41 installed on the upper surface of the folded ear 2. The upper surface of the locating strip 41 has several grooves 42 from front to back. A bolt 43 is installed in the inner cavity of the groove 42. The groove 42 is used to hide the bolt 43, so that the locating strip 41 and the folded ear 2 are in the same plane.

[0030] Furthermore, the traction component 5 includes one end of a pull rope 51 that is tied to the top rear side of the carton 1. The pull rope 51 is wrapped around the outer wall of the bolt 43 to lock the two left and right opposite flaps 2 to seal the carton 1. The other end of the pull rope 51 is equipped with several pull beads 52 at equal intervals. The pull beads 52 are spherical and easy to enter and exit the anti-tension mechanism 6.

[0031] Furthermore, the tensile mechanism 6 includes a mounting plate 61 embedded in the top front side of the carton 1. Several expansion rods 62 are installed sequentially from top to bottom on both sides of the mounting plate 61. The expansion rods 62 increase the tensile strength of the mounting plate 61 and prevent the mounting plate 61 from shifting. The front of the mounting plate 61 has two symmetrical slide rails 63. The inner cavity of the slide rail 63 is dovetail-shaped or T-shaped to prevent the clamping component 64 from disengaging from the slide rail 63. The clamping component 64 is slidably connected to the inner cavity of the slide rail 63, and the two clamping components 64 are symmetrical. The slide rail 63 is distributed on the outer wall of the mounting plate 61 from top to bottom outward. During the lifting and lowering of the clamping component 64, the two clamping components 64 can be closed or separated.

[0032] When the box is sealed under force, the expansion rod 62 provides lateral support to the mounting plate 61, significantly improving tensile strength and preventing deformation and displacement of the mounting plate. The traction component transmits the tension to the clamping plate 642, causing the clamping plate 642 to slide upward along the outward-inclined slide rail 63. The two clamping plates 642 gradually close towards each other, achieving self-locking clamping of the pull rope 51. After the box is opened and the force is released, the clamping plate 642 slides downward along the slide rail 63, and the two clamping components 64 automatically separate in opposite directions, quickly releasing the clamping of the pull rope 51 and completing the opening of the box.

[0033] The expansion rod 62 enhances structural strength, while the mounting plate 61 exhibits excellent tensile and deformation resistance, ensuring stable and uninterrupted sealing. The inclined slide 63 enables automatic closing or opening of the clamping components, forming a mechanical self-locking mechanism with the traction component 5, replacing tape sealing. Symmetrical clamping ensures uniform force distribution, resulting in high sealing strength and adaptability to sealing requirements with varying tension levels.

[0034] Furthermore, the clamping assembly 64 includes a slider 641 slidably connected to the inner cavity of the slide rail 63. A clamping plate 642 is installed on the outer wall of the slider 641. A through groove 643 is provided on the inner side of the clamping plate 642 for clamping the pull rope 51. Positioning grooves 644 communicating with the through grooves 643 are provided at equal intervals from top to bottom on the inner side of the clamping plate 642. The positioning grooves 644 store the pull beads 52.

[0035] Furthermore, the inner lining 322 is made of toughened modified polylactic acid foam biodegradable cushioning material. The toughened modified polylactic acid foam material uses L-polylactic acid with a molecular weight of 80,000-120,000 as the matrix resin, adds 8%-12% polybutylene adipate / terephthalate (PBAT) as a bio-based toughening agent, 2%-4% nanocellulose whiskers as a nucleating reinforcing agent, and 0.8%-1.5% tributyl acetylacetonate as an environmentally friendly plasticizer, and is prepared by supercritical carbon dioxide intermittent foaming process. The apparent density of toughened modified polylactic acid foam is controlled between 0.06 and 0.10 g / cm³. 3 Closed-cell ratio ≥85%, foaming ratio 20-28 times, 25% compressive stress 0.03-0.06MPa, 25% compression set ≤4%, drop ball impact rebound rate ≥45%; The inner liner 322 is an integrally molded structure that is heat-pressed and bonded to the top fold of the supporting cardboard 321. Its surface in contact with food has hemispherical buffer bumps evenly distributed. The diameter of the hemispherical buffer bumps is 3-6mm, the height is 2-4mm, and the center-to-center distance between adjacent bumps is 10-12mm.

[0036] Working principle: Step 1: Place the food on the base 353. Under the weight of the food, the limiting post 351 is pressed down. The limiting post 351 pulls one end of the first connecting rod 354 downward. The other end of the first connecting rod 354 pulls the second connecting rod 355 to swing. The second connecting rod 355 pushes the top plate 323 upward, shortening the length of the supporting cardboard 321. The supporting cardboard 321 gradually folds. As the width of the supporting cardboard 321 increases, the inner liner 322 moves inward until it contacts the outer packaging of the food. The inner liner 322 protects the food from all sides, realizing the food packaging. Since the inner liner 322 is limited by the weight of the food, it is suitable for clamping and protecting food of various sizes. Step 2: When it is time to remove the food, lift the food up. The weight of the food will no longer press down on the base 353, and the inner liner 322 will reduce the clamping force on the food, so the food can be removed from the box 31. Step 3: When sealing the box, close the flap 2, cross the pull rope 51 around the bolts 43 on both sides, and press the pull bead 52 into the positioning groove 644. Since the pull rope 51 bears the pulling force of the flap 2 closing, when the pull bead 52 presses upward into the positioning groove 644, it causes the slider 641 to slide along the slide rail 63. The two clamps 642 close together, and the through groove 643 locks the pull rope 51, thereby locking the pull rope 51. The pull rope 51 is used to seal the box, replacing the traditional tape sealing method, avoiding damage to the flap 2, and allowing the carton 1 to be reused. Step 4: When it is necessary to open, pull down the pull rope 51 to make the pull bead 52 move downward. The pull bead 52 no longer squeezes the clamp plate 642. Under the gravity of the clamp plate 642, the slider 641 slides down the slide rail 63. The two clamp plates 642 separate, and the through groove 643 no longer clamps the pull rope 51. The restriction on the pull rope 51 and the pull bead 52 is released, and the pull bead 52 can be taken out. Pull the pull rope 51 to get off the bolt 43, and the folding ear 2 can be opened.

[0037] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these should also be considered within the scope of protection of the present invention. These will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. An environmentally friendly food packaging box structure with a biodegradable cushioning liner, comprising a cardboard box (1) and four flaps (2), the four flaps (2) being integrally formed and installed around the top of the cardboard box (1), and the cardboard box (1) being sealed by folding the flaps (2), characterized in that, The bottom of the inner cavity of the carton (1) is uniformly equipped with a support mechanism (3). The support mechanism (3) is used to store food of different volumes. The two flaps (2) on the left and right sides are equipped with locators (4). The top of the rear side of the carton (1) is equipped with a traction component (5). The top of the front side of the carton (1) is embedded with an anti-tension mechanism (6). The traction component (5) winds back and forth on the two locators (4) and fixes the traction component (5) to the anti-tension mechanism (6) to seal the carton (1). The support mechanism (3) includes a box body (31) installed at the bottom of the inner cavity of the carton (1). Clamping components (32) are installed around the inner wall of the box body (31). A base plate (33) is installed at the bottom of the inner wall of the box body (31). Through holes (34) perpendicular to the inner wall of the carton (1) are opened around the upper surface of the base plate (33). A drive component (35) is inserted into the center of the base plate (33). The drive component (35) supports the food while pulling the clamping component (32).

2. The environmentally friendly food packaging box structure with a biodegradable cushioning liner according to claim 1, characterized in that, The clamping assembly (32) includes a support cardboard (321) installed on the inner wall of the carton (1), with an inner liner (322) installed on the top inner side of the support cardboard (321) and a top plate (323) installed on the bottom end of the support cardboard (321).

3. The environmentally friendly food packaging box structure with a biodegradable cushioning liner according to claim 2, characterized in that, The support cardboard (321) has multiple creases at equal intervals from top to bottom, and the topmost crease on the outer wall of the support cardboard (321) is installed with the inner lining (322).

4. The environmentally friendly food packaging box structure with a biodegradable cushioning liner according to claim 3, characterized in that, The drive assembly (35) includes a limiting post (351) inserted into the center of the base plate (33). A locking block (352) is installed on the outer wall of the limiting post (351). The locking block (352) is locked on the upper surface of the base plate (33) to prevent the limiting post (351) from descending. A base (353) is installed on the top of the limiting post (351). The base (353) supports the food. One end of a first connecting rod (354) is installed around the bottom of the outer wall of the limiting post (351) through a pin. A second connecting rod (355) is installed around the bottom of the inner cavity of the box body (31) through a pin. One end of the second connecting rod (355) is connected to the other end of the first connecting rod (354) through a pin. The other end of the second connecting rod (355) is connected to the bottom of the top plate (323) through a pin. The shaft joint of the second connecting rod (355) is close to the limiting post (351).

5. The environmentally friendly food packaging box structure with a biodegradable cushioning liner according to claim 4, characterized in that, The locator (4) includes a locating strip (41) installed on the upper surface of the folded ear (2). The upper surface of the locating strip (41) has several grooves (42) from front to back, and a plug (43) is installed in the inner cavity of the groove (42).

6. The environmentally friendly food packaging box structure with a biodegradable cushioning liner according to claim 5, characterized in that, The traction component (5) includes one end of a pull rope (51) tied to the top of the rear side of the carton (1). The pull rope (51) is wrapped around the outer wall of the plug (43) to lock the two left and right opposite folding ears (2). The other end of the pull rope (51) is equipped with several pull beads (52) at equal intervals.

7. The environmentally friendly food packaging box structure with a biodegradable cushioning liner according to claim 6, characterized in that, The tensile mechanism (6) includes a mounting plate (61) embedded in the top front side of the carton (1). Several expansion rods (62) are installed on the left and right sides of the mounting plate (61) from top to bottom. The expansion rods (62) increase the tensile strength of the mounting plate (61). The front of the mounting plate (61) has two symmetrical slides (63). The inner cavity of the slides (63) is slidably connected to a clamping assembly (64), and the two clamping assemblies (64) are symmetrical.

8. The environmentally friendly food packaging box structure with a biodegradable cushioning liner according to claim 7, characterized in that, The slide rails (63) are distributed on the outer wall of the mounting plate (61) from top to bottom and outward.

9. The environmentally friendly food packaging box structure with a biodegradable cushioning liner according to claim 8, characterized in that, The clamping assembly (64) includes a slider (641) slidably connected to the inner cavity of the slide (63). A clamping plate (642) is installed on the outer wall of the slider (641). A through groove (643) is opened on the inner side of the clamping plate (642). The through groove (643) is used to clamp the pull rope (51). A positioning groove (644) communicating with the through groove (643) is opened at equal intervals from top to bottom on the inner side of the clamping plate (642). The positioning groove (644) stores the pull beads (52).

10. The environmentally friendly food packaging box structure with a biodegradable cushioning liner according to claim 9, characterized in that, The inner lining (322) is made of toughened modified polylactic acid foam biodegradable cushioning material. The toughened modified polylactic acid foam material uses L-polylactic acid with a molecular weight of 80,000-120,000 as the matrix resin, adds 8%-12% poly(butylene adipate / terephthalate) as a bio-based toughening agent, 2%-4% nanocellulose whiskers as a nucleating reinforcing agent, and 0.8%-1.5% tributyl acetylacetate as an environmentally friendly plasticizer, and is prepared by supercritical carbon dioxide intermittent foaming process.

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