Degradable paper lunch box with cover

Abstract

This utility model discloses a biodegradable paper lunch box with a lid, including a box body, a lid, and a locking connection structure between the two. The box body cavity is folded with three creases to form an inverted V-shaped partition, while the lid body is folded with five creases to form a W-shaped protrusion. The protrusion has a through groove for precise insertion of the partition, achieving a barrier-like connection between the lid and the box body, effectively solving the problem of leakage when holding soup-type foods. Extended reinforcing plates on the side walls of the box body enhance the side wall connection strength, and the partition is reinforced with reinforcing ribs that cooperate with the protrusion guide groove, improving load-bearing stability and assembly accuracy. The locking structure achieves a sealed connection through inserts and slots on the first and second flanges. The entire box is made of biodegradable coated paper, combining environmental friendliness, structural strength, and leak-proof performance.

Description

Technical Field

[0001] This utility model relates to the field of paper lunch box technology, specifically to a biodegradable paper lunch box with a lid. Background Technology

[0002] Paper food containers with lids are food packaging containers made of paper materials, usually equipped with removable or fixed lids, used to hold various foods. The surface is coated with a waterproof coating, such as polyethylene or polylactic acid, to improve durability and leak-proof performance. Paper food containers have emerged to replace traditional plastic food containers, especially as disposable tableware, being more environmentally friendly and portable, and are widely used in fast food, takeout, and other similar applications.

[0003] To facilitate temporary food preservation and prevent contamination, paper food containers are increasingly equipped with lids. When holding salads, bento boxes, or soups, the lids prevent leakage and ensure safe transportation. In addition, to avoid mixing different foods when holding multiple items, which would affect customer experience, existing paper food containers also have divider structures. However, current paper food containers, such as CN21595869U, only use partitions on the inside of the container to separate food, which can easily lead to cross-contamination of flavors. Furthermore, when containing sauces, sauces often splatter across the top of the partitions during delivery. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a biodegradable paper lunch box with a lid, effectively avoiding the single partition of existing paper lunch boxes.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0006] A biodegradable paper lunch box with a lid includes a box body with an opening, a lid that fits the opening, an opening containing a cavity, a partition inside the cavity of the box body, a protrusion on the lid that fits the partition, a through groove on the protrusion, the partition being inserted into the through groove, and a locking connection structure between the box body and the lid in the circumferential direction.

[0007] As a preferred technical solution, the partition is made by folding the box body through three parallel folds. The three folds include bottom edge folds and middle folds. The bottom edge folds on both sides are folded in a symmetrical direction along the middle fold, forming a structure with an inverted V-shaped cross section. The box body between each bottom edge fold and the middle fold forms one side of the partition.

[0008] As a preferred technical solution, the protrusion is made by folding the cover body through five parallel creases. The five creases include three bottom edge creases and two middle creases. The two middle creases and the three bottom edge creases are arranged alternately to form a W-shaped structure.

[0009] It is necessary to clarify that although the term "crease" is used here to describe the structure, it can be formed by die-cutting and folding finished paper or by directly obtaining it through pulp molding, rather than being a limitation on whether or not a folding process is actually used.

[0010] As a preferred technical solution, the locking connection structure includes a first flange on the outer periphery of the opening of the box body, a second flange on the outer periphery of the cover body that adapts to the first flange, a insertion groove on the first flange, and a insert on the second flange that adapts to the insertion groove.

[0011] As a preferred technical solution, the edge of the first flange is provided with a rolled edge.

[0012] As a preferred technical solution, the connection between the first flange and the second flange is made by step interlocking.

[0013] As a preferred technical solution, the partition is provided with reinforcing ribs, and the protrusion is provided with a guide groove adapted to the reinforcing ribs.

[0014] As a preferred technical solution, the box body includes a front side wall, a rear side wall, a left side wall and a right side wall. The left side wall extends to the front side wall and the rear side wall respectively and is provided with reinforcing pieces. The reinforcing pieces are respectively attached to the outer periphery of the front side wall and the rear side wall.

[0015] As a preferred technical solution, the box body and the cover body are connected as one unit by a connecting piece extending from their outer peripheries.

[0016] As a preferred technical solution, the box body and the cover body are made of coated paper.

[0017] The advantages and beneficial effects of this utility model are as follows: The partition in the lidded lunch box shown in this utility model is folded into an inverted V-shape through three creases in the box body, and the protrusion is folded into a W-shape through five creases in the lid body. The two are connected and separated by the partition being inserted into the through groove of the protrusion, allowing a single paper lunch box to hold foods including soup and sauces. The side wall of the box body is reinforced with extended reinforcing plates to enhance the connection strength; the partition is reinforced with additional ribs, and the protrusion is matched with guide grooves, which improves the load-bearing capacity while ensuring a precise and stable connection between the lid body and the partition of the box body. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the cross-sectional structure of this utility model;

[0020] Reference numerals: 1-box body, 2-lid body, 3-cavity, 4-partition, 5-protrusion, 6-through groove, 7-bottom edge crease, 8-middle crease, 9-first flange, 10-second flange, 11-insertion groove, 12-insertion piece, 13-rolled edge, 14-step, 15-reinforcing rib, 16-guide groove, 17-reinforcing piece, 18-connecting piece. Detailed Implementation

[0021] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0022] Example 1

[0023] A biodegradable paper lunch box with a lid includes a box body 1, a lid 2, and a locking connection structure. The box body 1 has an opening and a cavity 3, and the lid 2 can be fastened to the opening. A partition 4 is provided inside the cavity 3, and a protrusion 5 is provided on the lid 2. The partition 4 is inserted into the through groove 6 of the protrusion 5 to achieve a barrier connection.

[0024] The box body 1 is made of coated paper, with an opening forming a cavity 3 for holding food. A partition 4 is installed inside the cavity 3, formed by folding the box body 1 material. Specifically, at the bottom of the cavity 3, the box body 1 is folded along three parallel creases, including a middle crease 8 and two bottom edge creases 7. The folding direction is symmetrical along the middle crease, forming an inverted V-shaped cross-section. The portion of the box body between each bottom edge crease 7 and the middle crease 8 constitutes one side of the partition 4. In this way, the partition 4 divides the cavity 3 into multiple sections, preventing food odors from mixing.

[0025] The lid 2 fits the opening of the box 1 and is made of folded coated paper. The inside of the lid has protrusions 5, which are formed by folding the lid 2 material through five parallel creases. These five creases include three bottom edge creases 7 and two middle creases 8, arranged in an alternating pattern to form a W-shaped cross-section. A groove 6 is located in the center of the protrusion, and the top of the partition 4 is precisely inserted into this groove 6. This locks the lid 2 to the box 1, preventing leakage of soup.

[0026] The outer periphery of the opening of the box body 1 is provided with a first flange 9, and the outer periphery of the cover body 2 is provided with a matching second flange 10. The first flange 9 is provided with an insertion groove 11, and the second flange is provided with an insert 12. When connected, the insert 12 is inserted into the insertion groove 11 to achieve circumferential sealing and fastening.

[0027] The working principle of this embodiment is that the user first uses the cavity 3 of the box body 1 to hold food, and then folds the paper substrate of the box body 1 to form an inverted V-shaped partition; when the lid 2 is closed, the through groove 6 of the W-shaped protrusion is aligned with the top of the partition 4 and inserted to ensure that the partition 4 is inserted into the protrusion 5; finally, the locking connection structure is fastened to the insertion groove 11 through the insert 12 to complete the seal.

[0028] Example 2

[0029] A biodegradable paper lunch box with a lid is integrally molded using a molding process, based on Example 1. A reinforcing rib 15 is added to the partition 4, and a guide groove 16 is provided on the protrusion 5 to match the reinforcing rib 15. The side wall of the box is reinforced and connected by an extension reinforcing piece 17.

[0030] The partition 4, based on the inverted V-shaped structure formed by folding, is reinforced with a reinforcing rib 15. The reinforcing rib 15 is located on the surface of the partition 4 and is achieved through embossing. The W-shaped structure of the protrusion 5 has a guide groove 16, which is vertically opened to fit the shape of the reinforcing rib 15. When the partition 4 is inserted into the through groove 6 of the protrusion, the reinforcing rib 15 slides precisely into the guide groove 16, providing a guiding function and improving assembly accuracy and load-bearing capacity.

[0031] The box body 1 includes a front side wall, a rear side wall, a left side wall, and a right side wall. Reinforcing pieces 17 are provided on the left side wall extending from the front side wall and the rear side wall, respectively. These reinforcing pieces 17 are integrally formed from the box body material. When folded, the reinforcing pieces 17 are integrally connected to the outer periphery of the front side wall and the rear side wall to enhance the connection strength of the side walls and prevent leakage caused by deformation of the side walls during transportation.

[0032] During assembly, the box body 1 is first folded to form a partition 4 with reinforcing ribs 15, and the reinforcing piece 17 is attached to the side wall; after the lid 2 is folded, the guide groove 16 is aligned with the reinforcing ribs 15 and inserted, and the through groove 6 of the protrusion 5 receives the partition 4; finally, the locking structure is fastened. This design provides more stable load-bearing capacity when holding sauces or heavy objects.

[0033] Example 3

[0034] A biodegradable paper lunch box with a lid, in accordance with the technology of Embodiment 2, has a rolled edge 13 on the edge of the first flange 9, and the connection between the first flange 9 and the second flange 10 is fitted together by a step 14; and the box body 1 and the lid body 2 are connected as one unit by a connecting piece 18.

[0035] The first flange 9 has a rolled edge 13, which is formed by the flange material being rolled inward to enhance edge strength and prevent tearing. The first flange 9 and the second flange 10 are connected by a step 14, which has a concave-convex structure and forms a mechanical positioning when fitted to prevent loosening. After the insert 12 is inserted into the insertion slot 11, the step 14 provides a second seal, effectively preventing soup from overflowing.

[0036] The box body 1 and the lid body 2 are connected as one unit by a connecting piece 18 extending from their outer periphery. The connecting piece is integrally formed from coated paper and acts as a hinge when folded, allowing the lid to open and close without easily separating. This facilitates one-handed operation by the user and reduces assembly errors.

[0037] During production, the connecting piece 18 pre-connects the box body 1 and the cover 2; during use, the user unfolds the connecting piece 18, the cover 2 snaps onto the box body 1, and the partition 4 is inserted into the through groove 6 of the protrusion 5; the locking structure is connected by inserts, steps and rolled edges. Specifically, the insert 12 first enters the insertion groove 11, the step 14 is fitted and positioned, and the rolled edge 13 is used for edge blunting to prevent the user from cutting their fingers during use.

[0038] It is worth noting that the problem solved by the lidded paper lunch box of this utility model is the leakage of sauce between the multiple cavities of the lunch box. When the lunch box contains a sauce with strong fluidity, a layer of plastic wrap can be covered around the opening between the lid and the box body to prevent the sauce from leaking out of the opening of the lunch box.

[0039] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A biodegradable paper lunch box with a lid, comprising a box body (1) having an opening, wherein the box body (1) is provided with a lid (2) adapted to fit the opening, the opening being a cavity (3), characterized in that, A partition (4) is provided in the cavity (3) of the box body (1), and a protrusion (5) adapted to the partition (4) is provided in the cover body (2). The protrusion (5) is provided with a through groove (6), and the partition (4) is inserted into the inside of the through groove (6). A locking connection structure is provided in the circumference of the box body (1) and the cover body (2).

2. The biodegradable paper lunch box with lid according to claim 1, characterized in that: The partition (4) is made by folding the box (1) through three parallel folds. The three folds include the bottom edge fold (7) and the middle fold (8). The bottom edge folds (7) on both sides are folded in a direction symmetrical to each other along the middle fold (8), forming a structure with an inverted V-shaped cross section. The box (1) between each bottom edge fold (7) and the middle fold (8) forms one side of the partition (4).

3. The biodegradable paper lunch box with lid according to claim 1 or 2, characterized in that: The protrusion (5) is made by folding the cover (2) through five parallel creases. The five creases include three bottom edge creases (7) and two middle creases (8). The two middle creases (8) and the three bottom edge creases (7) are arranged alternately to form a W-shaped structure.

4. The biodegradable paper lunch box with lid according to any one of claims 1-3, characterized in that: The locking connection structure includes a first flange (9) on the outer periphery of the opening of the box body (1), a second flange (10) adapted to the first flange (9) on the outer periphery of the cover body (2), the first flange (9) being provided with a plug groove (11), and the second flange (10) being provided with a insert (12) adapted to the plug groove (11).

5. The biodegradable paper lunch box with lid according to claim 4, characterized in that: The first flange (9) has a rolled edge (13) on its edge.

6. The biodegradable paper lunch box with lid according to claim 4, characterized in that: The first flange (9) and the second flange (10) are connected by a step (14).

7. The biodegradable paper lunch box with lid according to any one of claims 1-3, characterized in that: The partition (4) is provided with reinforcing ribs (15), and the protrusion (5) is provided with guide grooves (16) adapted to the reinforcing ribs (15).

8. The biodegradable paper lunch box with lid according to any one of claims 1-3, characterized in that: The box body (1) includes a front side wall, a rear side wall, a left side wall and a right side wall. The left side wall extends to the front side wall and the rear side wall respectively and is provided with reinforcing pieces (17). The reinforcing pieces (17) are respectively attached to the outer periphery of the front side wall and the rear side wall.

9. The biodegradable paper lunch box with lid according to any one of claims 1-3, characterized in that: The box body (1) and the cover body (2) are connected as one unit by a connecting piece (18) extending from their outer periphery.

10. The biodegradable paper lunch box with lid according to any one of claims 1-3, characterized in that: The box body (1) and the cover body (2) are made of coated paper.

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