Airtight small inner box adopting in-mold injection molding mesh cloth and ultrasonic blanching

Abstract

The invention discloses an airtight small inner box adopting in-mold injection molding screen cloth and ultrasonic blanching. The airtight small inner box is composed of a double-color inner cover, an inner bottom, the in-mold injection molding screen cloth and an inner ring. The in-mold injection molding screen is characterized in that direct fusion of the PP ring and the nylon screen cloth is achieved through the IMD technology, and a PET base material is omitted; the in-mold injection molding screen and the inner ring are ultrasonically assembled to form a high-strength assembled ring, and the top of the high-strength assembled ring is sealed by hot ironing aluminum foil; a TPE sealing ring of the double-color inner cover interferes with the inner bottom to form secondary air tightness, and a rear button hinge structure replaces a nailing process. According to the scheme, the bonding firmness and air tightness are improved, the structure is simplified, cost is reduced, and the high-sealing-performance packaging requirement is met.

Description

Technical Field

[0001] The present invention relates to the technical field of packaging containers, and in particular to an airtight small inner box using an in-mold injection-molded mesh and ultrasonic hot stamping, which is suitable for containers of products such as cosmetics and medicines that require high airtightness packaging. Background Art

[0002] In the existing technology, the fusion of mesh cloth and injection-molded parts of packaging containers such as airtight powder boxes usually relies on an additional substrate (such as a PET substrate) for bonding. This method has the following defects: First, the use of PET substrate increases material costs and procurement processes; second, the bonding strength between the mesh cloth and the injection-molded part is insufficient, which can easily cause problems such as falling off or decreased sealing; third, the assembly of the inner cover and the inner bottom in traditional structures often uses complex processes such as nailing, resulting in low assembly efficiency and high cost; fourth, the airtightness is guaranteed by relying on a single sealing structure, and the sealing reliability needs to be improved.

[0003] The previous two generations of airtight powder compacts had room for improvement in the mesh fusion method and overall structural design, making it difficult to simultaneously meet high-quality sealing requirements and cost control needs. A new technical solution is urgently needed to solve the above problems. Summary of the Invention

[0004] The present invention aims to provide an airtight small inner box using an in-mold injection-molded mesh and ultrasonic hot stamping technology. By improving the fusion method of the mesh and the injection-molded parts, optimizing the assembly process and sealing structure, the airtight performance and structural strength of the packaging container are improved, while reducing production costs.

[0005] An airtight small inner box using in-mold injection molding mesh and ultrasonic hot stamping, characterized by the following innovative technical features: In-mold Molded Screen Structure: This in-mold molded screen is made by fusing PP rings and nylon mesh through the in-mold molding (IMD) process. This eliminates the need for a traditional PET backing material, allowing the mesh to be directly integrated with the PP rings for enhanced adhesion. The mesh roll is placed directly into the mold, and the PP rings are then die-cut to form the mesh.

[0006] Ultrasonic assembly process: The in-mold injection molded screen and the inner ring are assembled through ultrasonic technology to form an ultrasonic assembly ring. This assembly method is the first of its kind in China and significantly improves the structural firmness after assembly.

[0007] Double sealing structure: The top of the ultrasonic assembly ring is sealed to the aluminum foil through a hot stamping process to form the first seal; The two-color inner cover is made of a PP single-color cover and a TPE sealing ring by two-color injection molding. The TPE sealing ring and the inner bottom interfere with each other to form a second airtight structure.

[0008] Optimized assembly structure: The inner cover and inner bottom rear buttons are hinged and opened and closed by rotating the axis, replacing the traditional nailing structure to improve assembly efficiency. The front button of the inner cover is fastened to the inner bottom through three buckle points, making the fit more compact and enhancing the airtight effect.

[0009] Overall structure: The airtight small inner box consists of four parts: a two-color inner cover, an inner bottom, an in-mold injection-molded screen, and an inner ring. The inner ring is a combination of PP injection molding and hot-stamped aluminum foil. Compared with the prior art, the present invention has the following beneficial effects: Improved quality: The mesh is directly integrated with the injection molded part, which significantly improves adhesion and firmness. The ultrasonic assembly ring structure enhances overall stability, and the double sealing design ensures high airtightness.

[0010] Cost reduction: Eliminate PET substrate and directly purchase roll mesh, simplify structural design, and reduce material and assembly costs.

[0011] Improved efficiency: The rear button hinge rotation structure replaces the nailing process, greatly improving assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 This is a structural diagram of the in-mold injection-molded mesh fabric of the present invention, showing the in-mold injection molding method of combining the PP ring and the nylon mesh fabric; Figure 2 This is a structural diagram of the ultrasonic assembly ring of the present invention, showing the overall shape of the ultrasonic assembly of the in-mold injection-molded screen and the inner ring; Figure 3 This is a partial enlarged view of the ultrasonic assembly ring of the present invention, highlighting the ultrasonic connection position between the inner ring and the in-mold injection screen; Figure 4 This is a process diagram of the ultrasonic assembly ring + hot stamping aluminum foil of the present invention, showing the structure of hot stamping aluminum foil sealing on the top of the ultrasonic assembly ring; Figure 5 This is a partial enlarged view of the ultrasonic assembly ring + hot stamping aluminum foil process of the present invention, detailing the combination details of the inner ring, ultrasonic position, in-mold injection screen and aluminum foil; Figure 6 This is an assembly diagram of the small inner box of the present invention (before the assembly ring is pressed in), showing the relative positions of the two-color cover, the inner bottom, and the unpressed ultrasonic assembly ring with aluminum foil; Figure 7 This is an assembly diagram of the small inner box of the present invention (after the assembly ring is pressed in), showing the complete airtight structure formed after the assembly ring is pressed into the inner bottom. DETAILED DESCRIPTION

[0013] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example

[0014] like Figure 1-7 As shown; The utility model relates to a small airtight inner box which adopts in-mold injection mesh and ultrasonic hot stamping.

[0015] In this embodiment, in order to solve the technical problems existing in the prior art, as disclosed in the background technology above, "In the prior art, the fusion of the mesh cloth of the packaging container such as the airtight powder compact and the injection molded part usually relies on an additional substrate (such as a PET substrate) for bonding. This method has the following defects: First, the use of the PET substrate increases the material cost and procurement process; second, the bonding strength between the mesh cloth and the injection molded part is insufficient, which easily causes the problem of falling off or the sealing performance being reduced; third, the assembly of the inner cover and the inner bottom in the traditional structure often adopts a complex process such as nailing, resulting in low assembly efficiency and high cost; fourth, the airtightness is guaranteed by relying on a single sealing structure, and the sealing reliability needs to be improved.

[0016] The previous two generations of airtight compacts had room for improvement in the mesh fusion method and overall structural design, making it difficult to simultaneously meet high-quality sealing requirements and cost control needs. In actual use, this problem is clearly a real and difficult one to solve. In view of this, to address this technical issue, an airtight inner compact using in-mold injection mesh and ultrasonic hot stamping is provided.

[0017] like Figure 1-7 As shown in the figure; Component preparation Preparation of two-color inner cover: Using two-color injection molding process, first inject the PP one-color cover, and then inject the TPE sealing ring on its edge to form a two-color structure with elastic sealing function.

[0018] Insole preparation: Through PP injection molding, the insole edge is designed to have an interference fit structure with the TPE sealing ring.

[0019] In-mold injection molding screen preparation: Cut the nylon mesh roll into appropriate size and place it in the specific position of the mold; Inject PP raw materials into the mold and form a PP ring by injection molding, so that the PP ring and the mesh are fully integrated in the mold; The molded part is taken out and excess material is punched out to obtain the in-mold injection molding screen.

[0020] Inner ring preparation: Injection molded PP inner ring, with an aluminum foil hot stamping area reserved on its top.

[0021] Assembly process Preparation of ultrasonic assembly ring: Align the in-mold injection screen with the PP inner ring, and weld them at the predetermined position using ultrasonic welding equipment to form a strong ultrasonic assembly ring.

[0022] Aluminum foil hot stamping sealing: Cover the top of the ultrasonic assembly ring with aluminum foil, and use the hot stamping process to melt the aluminum foil and the edge of the assembly ring to form an aluminum foil sealed assembly ring.

[0023] Inner cover and inner bottom assembly: The rear button of the two-color inner cover is fastened to the rear button of the inner bottom through a hinge structure to form a rotatable connection; After closing the cover, the front button of the inner cover is buckled with the inner bottom through three buckle points, so that the TPE sealing ring interferes with the inner bottom to form a preliminary airtightness.

[0024] Final sealing assembly: After filling the contents, the aluminum foil sealing assembly ring is pressed into the inner bottom, forming a double sealing structure through the annular interference fit and the aluminum foil sealing layer. Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An airtight small inner box using in-mold injection molding mesh and ultrasonic hot stamping, characterized in that: It includes a two-color inner cover, an inner bottom, an in-mold injection-molded screen and an inner ring. The in-mold injection-molded screen is formed by fusing a PP ring and a nylon mesh through an in-mold injection molding process. The in-mold injection-molded screen and the inner ring are assembled through an ultrasonic process to form an ultrasonic assembly ring. The top of the ultrasonic assembly ring is sealed with aluminum foil through a hot stamping process. The two-color inner cover is formed by two-color injection molding of a PP one-color cover and a TPE sealing ring. The TPE sealing ring and the inner bottom interfere with each other to form an airtight structure.

2. The airtight small inner box using in-mold injection molding mesh and ultrasonic hot stamping according to claim 1, characterized in that: The preparation process of the in-mold injection molded screen is as follows: a roll of nylon mesh is placed in a mold, and a PP ring is injection-molded and combined with the mesh before punching and forming, thereby eliminating the PET substrate.

3. The airtight small inner box using in-mold injection molding mesh and ultrasonic hot stamping according to claim 1, characterized in that: The inner ring is a PP injection molded part, and the top of the inner ring is sealed and connected to the aluminum foil through a hot stamping process.

4. The airtight small inner box using in-mold injection molding mesh and ultrasonic hot stamping according to claim 1, characterized in that: The rear button of the two-color inner cover and the rear button of the inner bottom are fastened together through a hinge to form a rotatable opening and closing structure, replacing the traditional nailing process.

5. The airtight small inner box using in-mold injection molding mesh and ultrasonic hot stamping according to claim 1, characterized in that: The front button of the two-color inner cover is buckled with the inner bottom through three buckling points, thereby enhancing the compactness of the fit.

6. The airtight small inner box using in-mold injection molding mesh and ultrasonic hot stamping according to claim 1, characterized in that: The airtight small inner box forms a double airtight structure through interference fit between the TPE sealing ring and the inner bottom and hot sealing between the ultrasonic assembly ring and the aluminum foil.

7. The airtight small inner box using in-mold injection molding mesh and ultrasonic hot stamping according to claim 1, characterized in that: The ultrasonic assembly process of the in-mold injection-molded screen and the inner ring is the first assembly method in China.

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