Roof paper packaging box with sealed bottom

Abstract

The utility model discloses a roof paper packaging box with a sealed bottom, and belongs to the field of roof paper packaging boxes. The roof paper packaging box with the sealed bottom comprises a shell, second folding pieces are arranged on the two sides of the lower end of the shell, a first folding piece is arranged in the middle of the lower end of the shell, and double-layer first thermoplastic strips are formed at the lower ends of the first folding piece and the second folding pieces in a thermoplastic mode. The yoghurt packaging carton solves the problems that an existing yoghurt packaging carton is prone to causing thermoplastic failure at the folding position, prone to causing water leakage at the bottom and affecting the sealing effect, the second folding piece is convenient to bend through the reserved second thermoplastic strip, and after the second folding piece and the first folding piece are supported through the second supporting frame, the sealing effect is greatly improved. The first thermoplastic strip and the second thermoplastic strip can be prevented from being additionally bent, bending and folding are reduced, and gaps generated by folding of the first thermoplastic strip and the second thermoplastic strip at the thermoplastic position are avoided.

Description

Technical Field

[0001] This utility model relates to the field of roof-wrapped cardboard boxes, specifically a roof-wrapped cardboard box with a sealed bottom. Background Technology

[0002] Bottom-sealed gable-top cartons are a common type of carton used for yogurt packaging. These cartons are characterized by a bottom seal achieved through a pressing and thermoforming process, ensuring the yogurt won't leak during transportation and storage. The top is also sealed with a pressing and thermoforming process to create a unique gable shape, which is both easy to open and increases packaging stability. The gable shape design is not only aesthetically pleasing but also effectively prevents yogurt from spilling when poured. Bottom-sealed gable-top cartons combine sealing and convenience, and are widely used in the packaging of yogurt and other dairy products.

[0003] When folding the bottom of a yogurt carton after thermoforming, the bottom material is pre-pressed to form a rectangle in the middle and triangles on both sides. The fold is then made along the creases between the triangles and the rectangle. During this folding process, the creases have just been thermoformed, and there are two layers of packaging paper material at the folded thermoformed area, which is equivalent to folding and bending four layers of packaging paper material. This can easily cause the thermoforming at the folded area to fail, leading to water leakage at the bottom and affecting the sealing effect. Utility Model Content

[0004] The purpose of this utility model is to provide a bottom-sealed roof-wrapped cardboard box. The reserved second thermoplastic strip facilitates the bending of the second folding piece. After the second support frame supports the second folding piece and the first folding piece, it can avoid the need for additional bending of the first and second thermoplastic strips, reduce bending and folding, and prevent gaps from forming between the first and second thermoplastic strips at the thermoplastic position due to folding, thus solving the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a bottom-sealed roof-wrapped cardboard box, comprising an outer shell, second folding pieces on both sides of the lower end of the outer shell, and a first folding piece in the middle of the lower end of the outer shell. The lower ends of the first and second folding pieces are thermoformed into double-layer first thermoplastic strips. Second thermoplastic strips with grooves are provided on both sides of the first thermoplastic strips. Strip-shaped second support frames are provided at both the front and rear ends of the grooves. The second support frames are connected to the second folding pieces by adhesive. The second thermoplastic strips with grooves facilitate the bending of the second folding pieces.

[0006] Preferably, the groove is located at the lower end of the second folded piece, so that the second thermoplastic strip with the groove is in an active bending position, and the groove facilitates the sealing of the bottom of the outer casing.

[0007] Preferably, a bending piece is provided between the second folded piece and the first folded piece, and the bending piece is positioned between the second folded piece and the first folded piece due to the constraint of the first support frame.

[0008] Preferably, a gasket is provided at both the front and rear ends between the two second folded pieces. The gasket is fixed to the position of the first folded piece at the lower end of the outer shell by glue. After the gasket is used for support, the lower end of the second folded piece can be supported by the gasket.

[0009] Preferably, a first support frame is provided between the second folding piece and the outer shell, and the first support frame is connected to the outer shell and the first folding piece respectively by glue. The protruding first support frame can restrict the bending position of the second folding piece, and at the same time, the second folding piece can restrict and support the two sides of the outer shell, which can facilitate the user to grab and hold.

[0010] Preferably, the first support frame is C-shaped. The C-shaped first support frame prevents the grip from slipping off and provides additional support and anti-slip effect.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] This invention features a first support frame fixed to the upper end of the second folding piece and the side of the outer shell with adhesive. A second thermoplastic strip is formed by cutting a groove at the position of the first thermoplastic strip at the lower end of the second folding piece, which facilitates bending. The second support frame is also fixed to the lower end of the second folding piece with adhesive at both ends of the second thermoplastic strip. This eliminates the need for additional bending of the first and second thermoplastic strips after thermoplasticization. The first support frame restricts the second support frame to be parallel to both sides of the first thermoplastic strip, allowing the second support frame to directly support the gap between the second and first folding pieces. The groove position reduces the bending strength at the thermoplastic position. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall external structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the second folded piece of this utility model in a bent state;

[0015] Figure 3 For the present utility model Figure 2 Enlarged view of a portion of region A in the middle;

[0016] Figure 4 This is an exploded view of the connection position between the first support frame, the gasket, and the second support frame of this utility model.

[0017] Figure 5 This is a sectional view showing the positional relationship of the second support frame of this utility model;

[0018] Figure 6 This is a schematic diagram of the external structure of the second folded piece and the first folded piece in the prior art;

[0019] Figure 7 This is a cross-sectional view of the internal structure of the second folded piece in the prior art;

[0020] Figure 8 This is a schematic diagram of the bottom sealing state in the prior art.

[0021] In the figure: 1. Outer shell; 2. First folding piece; 3. Second folding piece; 4. Bending piece; 5. Gasket; 6. First support frame; 7. Roof structure; 8. First thermoplastic strip; 9. Groove; 10. Second support frame; 11. Second thermoplastic strip. Detailed Implementation

[0022] The present invention will be further described below with reference to specific embodiments.

[0023] like Figure 1 As shown, this embodiment of a bottom-sealed roofed cardboard box includes an outer shell 1. The upper end of the outer shell 1 is thermoformed to form a roof structure 7. The reserved roof structure 7 position facilitates the daily use of the roofed cardboard box. Referring to Chinese Patent No. CN202098602U, the roof shape is formed by folding. This application does not make any improvements to the roof structure or the pressing method. Furthermore, the splicing and thermoforming of the roof structure are conventional technologies, so they are not described in detail in this application.

[0024] In order to enhance the thermoplastic sealing effect at the lower end of the outer shell 1, the two sides of the lower end of the outer shell 1 are pressed to form a second folded piece 3. A first folded piece 2 is provided in the middle of the lower end of the outer shell 1. The first folded piece 2 is located between the two second folded pieces 3. The second folded pieces 3 can seal the bottom of the outer shell 1 after being bent towards the lower end of the first folded piece 2.

[0025] Furthermore, since the second folded piece 3 and the first folded piece 2 are formed by pressing and folding, the gap at the lower end of the first folded piece 2 and the second folded piece 3 is formed by thermoplastic forming of a double-layer first thermoplastic strip 8.

[0026] To prevent thermoplastic failure after bending at position 8 of the first thermoplastic strip, and to avoid gaps at the bending point of the first thermoplastic strip 8, such as... Figure 2 As shown, grooves 9 are formed on both sides of the first thermoplastic strip 8 by cutting. The grooves 9 are located at the lower end of the second folded piece 3. The reserved grooves 9 facilitate bending and folding, which can improve the bottom sealing effect.

[0027] The first thermoplastic strip 8 with the groove 9 is formed into the second thermoplastic strip 11 for subsequent bending, reducing the length of the second thermoplastic strip 11 and facilitating the subsequent bending of the second thermoplastic strip 11.

[0028] It is worth mentioning that a bending piece 4 is provided between the second folding piece 3 and the first folding piece 2. After the second folding piece 3 is bent at the lower end of the first folding piece 2, the bending piece 4 and the corresponding groove 9 are convenient for bending and support.

[0029] In this embodiment, as Figure 3 and Figure 5 As shown, strip-shaped second support frames 10 are provided at both the front and rear ends of the groove 9. The second support frames 10 are connected to the second folding piece 3 by glue. After the second folding piece 3 is folded, a pair of grooves 9 are parallel to the front and rear ends of the second thermoplastic strip 11. After the bending piece 4 is bent, the second support frames 10 are attached to the lower end of the first folding piece 2.

[0030] Both second folding pieces 3 are supported by the first folding piece 2 through the second support frame 10. Both the front and rear ends of the two second folding pieces 3 are provided with pads 5. The pads 5 are fixed to the position of the first folding piece 2 at the lower end of the outer shell 1 with glue. The folded second folding pieces 3 can be supported by the pads 5. The second folding pieces 3 and the pads 5 can jointly support the lower end of the outer shell 1.

[0031] To support the gap between the second folding piece 3 and the first folding piece 2, and to facilitate bending of the second folding piece 3 at the bending piece 4 position, the second support frame 10 is used. Figure 4 As shown, a first support frame 6 is provided between the second folding piece 3 and the outer shell 1, and the first support frame 6 is connected to the outer shell 1 and the first folding piece 2 respectively by glue. The first support frame 6 can ensure that the second folding piece 3 forms a bent piece 4 after bending.

[0032] Furthermore, the first support frame 6 is C-shaped, which can support the outer shell 1 and the first folding piece 2, and at the same time, it can also make it easy for the user to manually grasp the entire outer shell 1.

[0033] Working principle: After folding and thermoforming the packaging box, press the lower end of the outer shell 1 to form a double-layer structure. This creates double-layered second folded pieces 3 on both sides of the lower end of the outer shell 1, and a double-layered first folded piece 2 between the two second folded pieces 3. After pressing the lower end of the outer shell 1, clamp and thermoform the seam at the lower end of the outer shell 1 to form a double-layered strip-shaped first thermoplastic strip 8 structure. First support frames 6 for supporting and limiting bending positions are glued to both sides of the outer shell 1. Grooves 9 are formed on both sides of the first thermoplastic strip 8. The first thermoplastic strip 8 at the groove 9 position forms a second thermoplastic strip 11. Second support frames 10 for support are glued to the front and rear ends of the groove 9. The second fold... The stacked piece 3 is bent under the constraint of the first support frame 6 to form a C-shaped bent piece 4. The bending causes the second support frame 10 to wrap around both sides of the first thermoplastic strip 8, supporting the gap between the first folded piece 2 and the second folded piece 3. The cut groove 9 can reduce the bending strength of the first thermoplastic strip 8 and the second thermoplastic strip 11. Since the second support frame 10 supports the gap between the first folded piece 2 and the second folded piece 3, the first thermoplastic strip 8 and the second thermoplastic strip 11 do not need to be bent additionally before the second folded piece 3 is bent, reducing the bending position and providing a buffer area for the bending position, which can improve the sealing effect of the thermoplastic position. Finally, the pad 5 for buffering and supporting the bottom is glued between the two second folded pieces 3.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A bottom-sealed, roof-wrapped cardboard box, comprising a shell (1), characterized in that, The lower end of the outer shell (1) is provided with two second folding pieces (3) on both sides, and the lower end of the outer shell (1) is provided with a first folding piece (2) in the middle. The lower ends of the first folding piece (2) and the second folding piece (3) are formed with a double-layer first thermoplastic strip (8) by thermoplastic forming. The first thermoplastic strip (8) is provided with a second thermoplastic strip (11) with a groove (9) on both sides. The front and rear ends of the groove (9) are provided with a strip-shaped second support frame (10). The second support frame (10) is connected to the second folding piece (3) by glue.

2. A bottom-sealed roof-wrapped cardboard box according to claim 1, characterized in that, The groove (9) is located at the lower end of the second folded piece (3).

3. A bottom-sealed roof-wrapped cardboard box according to claim 2, characterized in that, A bent piece (4) is provided between the second folded piece (3) and the first folded piece (2).

4. A bottom-sealed roof-wrapped cardboard box according to claim 3, characterized in that, Gaskets (5) are provided at both ends between the two second folded pieces (3), and the gaskets (5) are fixed to the position of the first folded piece (2) at the lower end of the outer shell (1) by glue.

5. A bottom-sealed roof-wrapped cardboard box according to claim 4, characterized in that, A first support frame (6) is provided between the second folding piece (3) and the outer shell (1), and the first support frame (6) is connected to the outer shell (1) and the first folding piece (2) respectively by glue.

6. A bottom-sealed roof-wrapped cardboard box according to claim 5, characterized in that, The first support frame (6) is C-shaped.

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