A plastic box and its preparation method

Abstract

A plastic box includes a main structure, integrally molded, comprising an inner molding area, a molding base surface, and an outer molding area. The molding base surface includes a base surface periphery distributed in a ring shape, with the inner molding area surrounded by the base surface periphery and the outer molding area surrounding the base surface periphery. The inner molding area is recessed relative to the molding base surface, forming a receiving cavity. The outer molding area extends relative to the molding base surface towards the receiving cavity, forming a sidewall. The integral molding of the main structure forms a double-layered plastic box with the receiving cavity as the inner layer and the sidewall as the outer layer. Only a flat back panel is needed to complete the double-layered plastic box, eliminating the cumbersome process of creating a complex recessed outer shell fitted over the inner cavity. Furthermore, it avoids the problem of a structurally weak area caused by the connection between the recessed outer shell and the single-layer recessed inner liner at the opening of the double-layered box, thus improving overall strength.

Description

Technical Field

[0001] This invention relates to the field of vacuum forming technology, and in particular to a plastic box and its preparation method. Background Technology

[0002] Vacuum forming is a plastic processing technology. The main principle is to heat a flat, rigid plastic sheet until it softens, then use a vacuum to adhere it to the surface of a mold. After cooling, it is formed. The main process flow is: plastic sheet - cutting - sheet fixing - heating - forming - demolding - trimming - finished product.

[0003] Existing vacuum forming processes are used to create simple single-layer containers. When a double-layer container is needed, only the inner part can be made. After the inner part is made, it needs to be connected and installed to another integral outer shell with an opening. Double-layer containers made in this way require the creation of a complex outer shell, resulting in a complicated manufacturing process, higher costs, and lower structural strength.

[0004] Therefore, a double-layered plastic box with a relatively simple manufacturing process is needed. Summary of the Invention

[0005] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of this invention is to provide a plastic box with a double-layer structure and a relatively simple manufacturing process.

[0006] The technical solution adopted by this invention to solve its technical problem is:

[0007] A plastic box body includes a main structure, which is integrally formed and includes an inner forming area, a forming base surface, and an outer forming area.

[0008] The forming base surface includes a base surface periphery that is distributed in a ring shape, the inner forming area is surrounded by the base surface periphery, and the outer forming area is surrounded by the base surface periphery.

[0009] The inner forming area is recessed relative to the forming base surface to form a receiving cavity; the outer forming area extends relative to the forming base surface toward one side of the receiving cavity to form a sidewall.

[0010] By adopting the above technical solution, the main structure is integrally molded into a double-layered plastic box with the inner cavity as the inner layer and the side walls as the outer layer. Only a flat back panel needs to be added to complete a complete double-layered plastic box, eliminating the cumbersome process of making a complex recessed outer shell that fits over the inner cavity. In addition, it also avoids the problem of a structurally weak area caused by the connection between the recessed outer shell and the single-layer recessed inner liner at the opening of the double-layered box, thus improving the overall strength.

[0011] Preferably, with the molding base surface as the reference plane, the distance from the inner molding area to the furthest point of the molding base surface is less than the distance from the outer molding area to the furthest point of the molding base surface. This arrangement allows the flat back plate to be directly installed on the sidewalls formed by the main structure, without worrying about the receiving cavity protruding from the sidewalls.

[0012] As an improvement, the molding base surface includes multiple adjacent base surface partitions, each base surface partition being a closed ring, and the non-connected sidewalls of the multiple adjacent base surface partitions forming the periphery of the base surface.

[0013] By adopting the above technical solution, multiple isolated and independent cavities can be directly manufactured in one piece, which is convenient for making blister plastic boxes that can simultaneously pack and store different types of items.

[0014] As an improvement, the molding base surface is further provided with a base surface isolation area that is isolated from the periphery of the base surface.

[0015] By adopting the above technical solution, it is possible to more easily install auxiliary mounting side walls and mounting rods within the cavity.

[0016] As an improvement, the junction between the molding base surface and the inner molding area / outer molding area is chamfered / rounded.

[0017] By adopting the above technical solutions, the structural strength of the opening of the plastic box can be strengthened, and its durability can be improved.

[0018] As an improvement, a back plate is also included, the edge of which is connected to the edge of the outer forming area.

[0019] As an improvement, the main structure is provided with filler in the area between the inner molding area and the outer molding area.

[0020] By adopting the above technical solution, it is possible to further enhance the structural strength, thermal insulation, and sound insulation and absorption effects by adding filler material inside the double-layered plastic box to meet actual needs.

[0021] A method for manufacturing a plastic box as described above includes the following steps:

[0022] S1: Place the plastic sheet on the mold and fix the plastic sheet in place;

[0023] S2: Softening plastic sheets by heating;

[0024] S3: Turn on the suction pump to suction the plastic sheet until it fits against the mold, then turn off the suction pump;

[0025] S4: Turn on the air pump to separate the plastic sheet from the template and obtain the main structure;

[0026] The mold includes a base surface area that matches the forming base surface, a cavity forming plate area that matches the inner forming area, and a wall forming plate area that matches the outer forming area.

[0027] By adopting the above technical solution, the main structure containing the inner and outer two-layer structure of the cavity and sidewalls can be manufactured by only one molding process. In contrast, the existing technology requires molding with a concave mold and a convex mold, which means that it needs to be processed twice to make such a structure. This reduces the production steps and equipment required for preparation and simplifies the production process.

[0028] As an improvement, the mold is provided with several vents in the cavity forming area and the wall forming area, which are connected to a suction pump and an air pump.

[0029] As an improvement, the maximum distance between the cavity forming area of ​​the mold and the base surface area is less than the minimum distance between the wall forming area and the base surface area.

[0030] Compared with the prior art, the beneficial effects of the present invention are:

[0031] The main structure is integrally molded to form a double-layered plastic box with the inner cavity as the inner layer and the side walls as the outer layer. Only a flat back panel is needed to complete the double-layered plastic box, eliminating the cumbersome process of making a complex recessed outer shell that fits over the inner cavity. Furthermore, it avoids the problem of a structurally weak area created by the connection between the recessed outer shell and the single-layered recessed inner liner at the opening of the double-layered box, thus improving overall strength. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of a plastic box according to the present invention;

[0033] Figure 2 This is a side sectional view of the overall structure of a plastic box according to the present invention;

[0034] Figure 3 This is a side sectional view of a plastic box body from another angle according to the present invention;

[0035] Figure 4 This is a schematic diagram of the structure of a mold used for a plastic box body according to the present invention;

[0036] Among them, 1: main structure; 2: molding base surface; 3: inner molding area; 4: outer molding area; 5: receiving cavity; 6: side wall; 7: back plate; 8: base surface area; 9: cavity molding area; 10: wall molding area; 11: vent hole. Detailed Implementation

[0037] The present invention will now be further described in conjunction with the accompanying drawings and embodiments:

[0038] The present invention will be further described below with reference to specific embodiments. It should be understood that the following embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0039] It should be noted that when a component / part is referred to as being "set on" another component / part, it can be directly set on the other component / part or there may be an intervening component / part. When a component / part is referred to as being "connected / linked" to another component / part, it can be directly connected / linked to the other component / part or there may be an intervening component / part. The term "connected / linked" as used herein can include electrical and / or mechanical physical connections / links. The term "including / comprises" as used herein means the presence of a feature, step, or component / part, but does not exclude the presence or addition of one or more other features, steps, or components / parts. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. Furthermore, in the description of this application, the terms "first," "second," etc., are used for descriptive purposes and to distinguish similar objects only; there is no order between them, nor should they be construed as indicating or implying relative importance. Additionally, in the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0041] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0042] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0043] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0044] Variations in the shapes shown in the accompanying drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that may occur during manufacturing.

[0045] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application.

[0046] Implementation Case 1:

[0047] As attached Figure 1-4 As shown, a plastic box includes a main structure 1, which is integrally formed and includes an inner forming area 3, a forming base surface 2, and an outer forming area 4.

[0048] The molding base surface 2 includes a base surface periphery that is distributed in a ring shape, the inner molding area 3 is surrounded by the base surface periphery, and the outer molding area 4 is surrounded by the base surface periphery.

[0049] The inner forming area 3 is recessed relative to the forming base surface 2 to form a receiving cavity 5; the outer forming area 4 extends relative to the forming base surface 2 toward one side of the receiving cavity 5 to form a side wall 6.

[0050] The main structure 1 is integrally molded to form a double-layered plastic box with the inner cavity 5 as the inner layer and the side walls 6 as the outer layer. Only a flat back panel 7 is needed to complete the double-layered plastic box, eliminating the cumbersome process of making a complex recessed outer shell that fits over the inner cavity. In addition, it avoids the problem of a structurally weak area caused by the connection between the recessed outer shell and the single-layer recessed inner liner at the opening of the double-layered box, thus improving the overall strength.

[0051] Preferably, with the molding base surface 2 as the reference plane, the distance from the inner molding area 3 to the furthest point of the molding base surface 2 is less than the distance from the outer molding area 4 to the furthest point of the molding base surface 2. This arrangement allows the flat back plate 7 to be directly installed on the side wall 6 formed by the main structure 1 without worrying about the receiving cavity 5 protruding from the side wall 6.

[0052] The formed base surface 2 includes multiple adjacent base surface partitions, each base surface partition is a closed ring, and the non-connected sidewalls 6 of the multiple adjacent base surface partitions are connected to form the periphery of the base surface.

[0053] The plastic box can be molded in one piece to directly produce multiple isolated and independent storage cavities 5, which makes it easy to make blister plastic boxes that can simultaneously pack and store different types of items.

[0054] The molded base surface 2 also has a base surface isolation area that is isolated from the outer periphery of the base surface.

[0055] It allows for easier installation of auxiliary mounting sidewalls 6 and mounting rods within the accommodating cavity 5.

[0056] The junction between the molding base surface 2 and the inner molding area 3 / outer molding area 4 is chamfered / rounded.

[0057] It can strengthen the structural strength of the opening of the plastic box and improve its durability.

[0058] It also includes a back plate 7, the edge of which is connected to the edge of the outer forming area 4.

[0059] The main structure 1 is provided with filler in the area between the inner molding area 3 and the outer molding area 4.

[0060] By adding filler material inside the double-layered plastic box, the structural strength, thermal insulation, and sound insulation / absorption effects can be further enhanced to meet actual needs.

[0061] A method for manufacturing a plastic box as described above includes the following steps:

[0062] S1: Place the plastic sheet on the mold and fix the plastic sheet in place;

[0063] S2: Softening plastic sheets by heating;

[0064] S3: Turn on the suction pump to suction the plastic sheet until it fits against the mold, then turn off the suction pump;

[0065] S4: Turn on the air pump to cool the plastic sheet and separate it from the template to obtain the main structure 1;

[0066] The mold includes a base surface area 8 that matches the forming base surface 2, a cavity forming plate area 9 that matches the inner forming area 3, and a wall forming plate area 10 that matches the outer forming area 4.

[0067] The main structure 1, which includes an inner and outer two-layer structure containing a cavity 5 and a sidewall 6, can be manufactured by vacuum forming only once using a mold. In contrast, existing technologies require forming once with a concave mold and once with a convex mold, which means that a total of two processes are needed to make such a structure. This reduces the production steps and equipment required for preparation and simplifies the production process.

[0068] The mold has several vents 11 in the cavity forming area 9 and the wall forming area 10, which are connected to the suction pump and the air delivery pump.

[0069] The maximum distance between the cavity forming area 9 of the mold and the base surface area 8 is less than the minimum distance between the wall forming area 10 and the base surface area 8.

[0070] In summary, those skilled in the art, after reading this invention document, can make various other corresponding modifications to the technical solutions and concepts based on this invention without creative mental effort. Different application scenarios all fall within the scope of protection of this invention.

Claims

1. A plastic tank characterized in that, The main structure (1) is integrally formed and includes an inner forming area (3), a forming base surface (2), and an outer forming area (4). The forming base surface (2) includes a base surface periphery that is annular in shape, the inner forming area (3) is enclosed by the base surface periphery, and the outer forming area (4) is enclosed by the base surface periphery. The inner forming area (3) is recessed relative to the forming base surface (2) to form a receiving cavity (5), and the outer forming area (4) extends relative to the forming base surface (2) to the side of the receiving cavity (5) to form a side wall (6). The forming base surface (2) includes a plurality of adjacent base surface sub-areas, each base surface sub-area is annular in shape, and the side walls (6) of the adjacent base surface sub-areas that are not connected to each other form the base surface periphery. The junction between the forming base surface (2) and the inner forming area (3) / outer forming area (4) is chamfered / rounded, and the main structure (1) further includes a back plate (7) whose edge is connected to the edge of the outer forming area (4). With the forming base surface (2) as a reference plane, the distance from the inner forming area (3) to the farthest point of the forming base surface (2) is less than the distance from the outer forming area (4) to the farthest point of the forming base surface (2), so that the back plate (7) can be directly installed in the side wall (6) formed by the main structure (1).

2. The plastic tank of claim 1, wherein, The forming base surface (2) further includes base surface isolated areas that are isolated from the base surface periphery.

3. The plastic tank of claim 1, wherein, The main structure (1) is provided with a filler in the area between the inner forming area (3) and the outer forming area (4).

4. A method of manufacturing a plastic tank according to any one of claims 1-3, characterized in that, The method includes the following steps: S1: placing a plastic plate on a mold and fixing the plastic plate; S2: heating and softening the plastic plate; S3: turning on a suction pump to adsorb the plastic plate to the mold, and turning off the suction pump; S4: turning on a gas feeding pump to cool the plastic plate and separate the plastic plate from the mold to obtain the main structure (1). The mold includes a base surface area (8) that matches the forming base surface (2), a cavity forming piece area (9) that matches the inner forming area (3), and a wall forming piece area (10) that matches the outer forming area (4).

5. The method of claim 4, wherein the step of forming the plastic box includes the step of: The mold is provided with a plurality of air holes (11) connected to the suction pump and the gas feeding pump in the cavity forming piece area (9) and the wall forming piece area (10). ​ 6. The method of manufacturing a plastic tank of claim 5, wherein, The maximum distance from the cavity forming piece area (9) to the base surface area (8) is less than the minimum distance from the wall forming piece area (10) to the base surface area (8).

Images