Lunch box forming die capable of reducing die parting surface opening loss

Abstract

The utility model discloses a lunch box forming die capable of reducing die parting surface opening loss, which belongs to the technical field of disposable lunch boxes and comprises a bottom die and a top die matched with the bottom die, a plurality of guide holes are arranged on the bottom die, guide columns matched with the guide holes are arranged on the top die, four groups of die cores are arranged on the bottom die, and the die cores are arranged on the bottom die. Four groups of mold cores are arranged on the bottom mold, molding cavities are formed in the four groups of mold cores, glue injection holes are formed in the bottom mold and are positioned at the four groups of molding cavities, lower concave surfaces are arranged on the bottom mold and are positioned on the four groups of mold cores, and the lower concave surfaces are positioned at a parting surface of the bottom mold. And the height of the difference part is 0.01 mm, so that the appearance of the molded product is not influenced, and the normal use of the product is not influenced.

Description

Technical Field

[0001] This utility model relates to the field of disposable lunch box technology, specifically a lunch box forming mold that reduces the loss at the parting surface of the mold. Background Technology

[0002] Disposable lunch boxes have shifted from foam containers to environmentally friendly ones. Foam containers, due to their poor heat resistance and the environmentally damaging nature of their production, have been phased out. They have been replaced by plastic, paper, wooden, and biodegradable containers, among others. Plastics, with their low toxicity, high melting point, strong plasticity, ease of production, and relatively low cost, have become the mainstream material for manufacturing disposable lunch boxes. PP (polypropylene) possesses both mechanical and thermal properties, making it suitable for food packaging. Lunch boxes are categorized into environmentally friendly types, primarily made of plastic, paper, starch, and rare metals.

[0003] The above-mentioned technical conditions also have defects: when the existing disposable lunch box forming mold is used, its forming surface is flat. During the product production process, this surface is subjected to greater pressure, resulting in more wear and tear during continuous production, which will reduce the service life of the mold.

[0004] Based on this, this utility model designs a lunchbox forming mold that reduces the loss at the mold parting surface, in order to solve the above problems. Utility Model Content

[0005] The purpose of this utility model is to provide a lunchbox forming mold that reduces the loss at the parting surface of the mold, so as to solve the above-mentioned technical problems.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a lunchbox forming mold that reduces wear at the parting surface of the mold, comprising a bottom mold and a top mold adapted thereto. The bottom mold has multiple guide holes, and the top mold has guide posts adapted to the guide holes. The bottom mold has four sets of mold cores, each of which has a forming cavity. The bottom mold has injection holes located at the four forming cavities, and the bottom mold has concave surfaces located at the parting surface of the bottom mold.

[0007] By adopting the above technical solution, the concave surface can reduce the pressure during the forming of the mold parting surface, thereby allowing the mold to be used for a longer period of time.

[0008] Preferably, there is a difference between the top of the mold core and the concave surface.

[0009] By adopting the above technical solution, the height of the difference section is the height difference between the concave surface and the top surface of the mold core.

[0010] Preferably, the height of the difference portion is 0.01 mm.

[0011] By adopting the above technical solution, its height will not affect the appearance and shape of the product.

[0012] In summary, this application has the following beneficial technical effects: the recessed part can reduce the pressure on the mold forming surface, thereby extending the service life of the mold; and the height of the differential part is 0.01mm, which has no impact on the appearance of the product after molding and will not affect the normal use of the product. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the bottom mold structure in this embodiment;

[0015] Figure 2 This is a partial structural cross-sectional view of the bottom mold in this embodiment;

[0016] Figure 3 for Figure 2 Enlarged view of the structure at point A in the middle;

[0017] Figure 4 for Figure 3 Enlarged view of the structure at point B in the middle.

[0018] The attached diagram lists the components represented by each number as follows:

[0019] 1. Bottom mold; 2. Guide hole; 3. Mold core; 4. Molding cavity; 5. Injection hole; 6. Concave surface; 7. Difference part. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0021] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0022] A lunchbox molding die for reducing wear at the parting surface includes a bottom mold 1 and a matching top mold (not shown). The bottom mold 1 and top mold work together to injection mold the lunchbox. Multiple guide holes 2 are provided on the bottom mold 1, and guide pillars matching the guide holes 2 are provided on the top mold, thereby reducing mold displacement during mold closing. Four sets of mold cores 3 are provided on the bottom mold 1, and molding cavities 4 are provided inside each of the four sets of mold cores 3, enabling simultaneous molding of four sets of lunchboxes, thus improving production efficiency. Injection holes 5 are provided on the bottom mold 1 at each of the four molding cavities 4 for conveying adhesive between the bottom mold 1 and the top mold, followed by cooling and molding. Concave surfaces 6 are provided on the bottom mold 1 and on each of the four sets of mold cores 3, located at the parting surface of the bottom mold 1. These concave surfaces reduce pressure on the mold during product molding, reduce mold wear, and extend the mold's service life.

[0023] Furthermore, there is a difference portion 7 between the top of the mold core 3 and the concave surface 6, which creates a height difference between the concave surface 6 and the top surface of the mold core 3, thereby dispersing the pressure at the forming surface of the mold and protecting the mold.

[0024] Furthermore, the height of the difference section 7 is 0.01 mm.

[0025] The implementation principle of this embodiment is as follows: During use, the top mold and bottom mold 1 are respectively installed on the driving structure. Then, during mold closing, the driving structure brings the top mold and bottom mold 1 closer together for mold closing. The guide post on the top mold enters the guide hole 2 on the bottom mold 1. After the mold is fully closed, an appropriate amount of glue is injected into the mold through the glue injection hole 5. During product molding, since the parting surface is provided with a concave surface 6, the pressure on the parting surface can be dispersed, thereby reducing the pressure on the mold and improving the service life of the mold. At the same time, the height of the difference part 7 is 0.01mm, which has no impact on the appearance and shape of the product and can improve the subsequent use effect.

[0026] In the description of this utility model, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "side", "top", "inner", "front", "center", "both ends", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] 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, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lunchbox forming mold for reducing wear at the parting line, comprising a bottom mold (1) and a matching top mold, characterized in that: The bottom mold (1) is provided with multiple guide holes (2), and the top mold is provided with guide pillars that are compatible with the guide holes (2). The bottom mold (1) is provided with four sets of mold cores (3), and each of the four sets of mold cores (3) is provided with a molding cavity (4). Each of the four sets of mold cores (3) is provided with a glue injection hole (5) on the bottom mold (1) and located at the four sets of molding cavities (4). Each of the four sets of mold cores (3) on the bottom mold (1) is provided with a concave surface (6), and the concave surface (6) is located at the parting surface on the bottom mold (1).

2. The lunchbox forming mold according to claim 1, characterized in that: The top of the mold core (3) has a difference (7) between the concave surface (6) and the bottom surface (7).

3. A lunchbox forming mold for reducing wear at the parting line of the mold according to claim 2, characterized in that: The height of the difference section (7) is 0.01 mm.

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