Airtight small inner box with in-mold injection molding screen cloth ring and manufacturing method of airtight small inner box

Abstract

The invention discloses an airtight small inner box with an in-mold injection molding screen cloth ring and a manufacturing method of the airtight small inner box, and belongs to the technical field of packaging containers. The airtight small inner box is composed of a double-color inner cover, an inner bottom and an in-mold injection molding screen cloth ring, and high airtightness and fusion of the screen cloth and the PP ring are achieved through the unique structural design and the innovative in-mold injection molding (IMD) technology. Compared with a traditional airtight small powder box adopting ultrasonic wave to fuse the mesh cloth and the injection molding ring, the mesh cloth and the injection molding part are fused more sufficiently, the adhesion degree and firmness are higher, the positioning precision is improved, and the product quality stability is enhanced. Meanwhile, an ultrasonic jig and accessories are omitted, assembly procedures and workers are reduced, the production efficiency is improved, and the production cost is reduced. According to the invention, the problems of quality and cost of mesh cloth fusion of the traditional airtight small powder box are effectively solved, and remarkable economic benefits and market application prospects are achieved.

Description

Technical Field

[0001] The present invention relates to the field of packaging container technology, and in particular to a small inner box with an innovative structure and manufacturing process, which utilizes an in-mold injection-molded mesh ring to achieve high airtightness. The small inner box is widely used in packaging scenarios in the cosmetics, pharmaceutical, food and other industries that have strict requirements on product sealing and storage environment. Background Art

[0002] In the field of packaging, the airtightness of the small inner box plays a decisive role in the quality and shelf life of the packaged product. Traditional airtight small powder boxes and other products have significant defects in the fusion technology of mesh and injection molding ring: Quality defects: The ultrasonic fusion technology used in the past can achieve the combination of mesh and injection ring, but the fusion effect is poor. The adhesion and firmness of the mesh substrate and the injection molded part are difficult to achieve the ideal state. During long-term storage and transportation, the mesh is easily affected by vibration, temperature changes and other factors, and it is very easy for the mesh to fall off the injection ring, resulting in the loss of air tightness of the packaging. The product is easily affected by moisture and oxidation, which in turn affects the quality. Moreover, during the ultrasonic fusion process, the positioning accuracy depends on the operator's experience and the stability of the equipment. There are deviations in the relative position of the mesh and the injection ring between different batches of products, which makes the product quality uneven and difficult to meet the packaging consistency requirements of high-end products.

[0003] Cost disadvantage: The ultrasonic fusion process requires specially customized ultrasonic fixtures and a series of supporting accessories. The procurement cost of these equipment is high, and the subsequent maintenance and replacement costs are also high. In addition, the assembly process of this process is cumbersome and requires a lot of manual participation, which not only increases labor costs, but also easily affects product quality due to differences in human operations. From the perspective of production efficiency, the ultrasonic pen device can only process one product at a time, with a long production cycle and low production capacity, which makes it difficult to meet large-scale production needs, resulting in high unit product production costs and weakening the market competitiveness of the product. Summary of the invention

[0004] The present invention aims to overcome the technical difficulties of traditional airtight small powder boxes and provide a new airtight small inner box with an in-mold injection molded mesh ring. By optimizing the structural design and innovating the manufacturing process, the airtight performance of the small inner box and the product quality stability are significantly improved, while the production cost is greatly reduced, thereby enhancing the comprehensive competitiveness of the product in the market.

[0005] Component composition: The airtight small inner box consists of three core components: a two-color inner cover, an inner bottom, and an in-mold injection molded mesh ring. The two-color inner cover uses a two-color injection molding process of a PP one-color cover and a TPE sealing ring. The high elasticity of the TPE sealing ring is closely interfered with the inner bottom to initially build an airtight barrier. The in-mold injection molded mesh ring is an integrated molding of the PP ring and the nylon mesh through the in-mold injection molding (IMD) process, followed by a hot stamping aluminum foil sealing process to further enhance the sealing effect.

[0006] Assembly process: During assembly, first precisely fasten the two-color inner cover and the inner bottom through the rear button hinge. After closing the cover, the front button is firmly fastened by three carefully designed fastening points to ensure smooth opening and closing and reliable sealing. Among them, the front button can be opened and closed repeatedly, and the rear button hinge can rotate flexibly for opening and closing, which greatly facilitates the use of users. After filling the contents, precisely press the in-mold injection mesh cloth ring into the inner bottom and seal it with aluminum foil through annular interference fit to form a second airtight defense line with double insurance.

[0007] Process innovation: Different from the traditional ultrasonic fusion process, the present invention adopts the advanced in-mold injection (IMD) technology. When producing the in-mold injection mesh cloth ring, with the help of a manipulator, accurately place the nylon mesh cloth in the mold. The negative pressure vacuum device in the mold quickly adsorbs the mesh cloth to accurately position it, and then the injection molding machine injects PP material to complete the injection molding action, realizing the perfect fusion of the mesh cloth and the injection molded part and becoming a tight whole. Compared with the prior art, the beneficial effects of the present invention are: Significant quality improvement: The in-mold injection (IMD) process enables the full fusion of the mesh cloth and the injection molded part, resulting in a qualitative leap in the adhesion and firmness, effectively avoiding the problem of mesh cloth shedding, and ensuring the long-term stable airtight performance of the packaging. The high-precision characteristics of mold positioning ensure the high consistency of products in different batches, greatly improving the quality stability of products and meeting the strict requirements of the high-end market for packaging quality.

[0008] Substantial cost reduction: Cancel the expensive ultrasonic fixtures and accessories, reduce complex assembly processes and a large amount of manual input, and instead use the injection molding machine to assist the manipulator operation to simplify the production process. Moreover, the in-mold injection (IMD) process can produce multiple products (8 pcs or 16 pcs) at one time. Compared with the ultrasonic pen device, the production efficiency is increased several times, greatly reducing the production cost per unit product and improving the economic benefits of the enterprise. Description of the drawings

[0009] The 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 to the present invention. In the drawings: Figure 1 is the mesh cloth structure diagram of the present invention; Figure 2 is the partially enlarged view of the mesh cloth of the present invention; Figure 3 is the schematic structural diagram of the PP ring after in-mold injection of the mesh cloth of the present invention; Figure 4 is the partially enlarged view of the PP ring after in-mold injection of the mesh cloth of the present invention; Figure 5Schematic diagram of the internal injection molding mesh + aluminum foil sealing structure of the present invention; Figure 6 Partial enlarged view of the in-mold injection molding mesh + aluminum foil sealing of the present invention; Figure 7 Schematic diagram of the assembled small inner box structure of the present invention; Figure 8 Partial enlarged view of the assembled small inner box of the present invention. Detailed implementation manners

[0010] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention. Embodiment

[0011] As Figure 1-7 shown; An in-mold injection molding mesh ring airtight small inner box and its manufacturing method.

[0012] In this implementation manner: To solve the technical problems existing in this prior art, as disclosed in the background art above, "in the packaging field, the airtight performance of the small inner box plays a decisive role in the quality and shelf life of the packaged products. Traditional airtight small powder boxes and other products have significant defects in the technology of fusing the mesh and the injection molding ring". In combination with actual use, this problem is obviously a real and relatively difficult problem to solve. In view of this, to solve this technical problem, an in-mold injection molding mesh ring airtight small inner box is provided on this basis.

[0013] As Figure 1-7 shown in the figure; Combined with the above content, an in-mold injection molding mesh ring airtight small inner box includes a two-color inner cover, an inner bottom, and an in-mold injection molding mesh ring; the two-color inner cover is injection molded with two colors of a PP one-color cover and a TPE sealing ring, and the in-mold injection molding mesh ring is injection molded with a PP ring and a nylon mesh in the mold and is sealed by hot stamping aluminum foil; the two-color inner cover and the inner bottom are buckled by a rear button hinge, and after closing the cover, the front button is buckled by three buckling points. The TPE sealing ring of the inner cover interferes with the inner bottom to form a first airtight structure. After filling the content, the in-mold injection molding mesh ring is pressed into the inner bottom, and a second airtight structure is formed through annular interference and aluminum foil sealing.

[0014] The manufacturing process of the in-mold injection molding mesh ring is as follows: Use a manipulator to place the nylon mesh in the mold, adsorb the nylon mesh through the negative pressure vacuum device of the mold, and then inject PP material for injection molding to integrate the nylon mesh and the PP ring into one body.

[0015] The front button has a repeated opening and closing function, and the rear button hinge can be rotated to open and close.

[0016] A manufacturing method of an airtight small inner box with an in-mold injection-molded mesh cloth ring, comprising the following steps: Manufacturing a two-color inner cover: Using two-color injection molding process, injecting PP material and TPE material to form a two-color inner cover; Manufacturing an in-mold injection-molded mesh cloth ring: After pre-treating the nylon mesh cloth, use a manipulator to place it into the mold. After the mold negatively adsorbs the mesh cloth, inject PP material for injection molding, and then perform hot stamping of aluminum foil for sealing; Assembling the small inner box: First, snap the two-color inner cover and the inner bottom through the rear button hinge, then snap the front button. After filling the contents, press the in-mold injection-molded mesh cloth ring into the inner bottom; Quality inspection: Perform airtight inspection, appearance and dimension inspection, and opening and closing performance inspection on the assembled small inner box.

[0017] Component manufacturing: Manufacturing the two-color inner cover: Select high-quality PP material and TPE material, and produce through a high-precision two-color injection molding machine. During the injection molding process, strictly control parameters such as temperature, pressure, and injection speed to ensure the tight combination and precise dimensions of the PP single-color cover and the TPE sealing ring, and the elasticity and sealing performance of the TPE sealing ring reach the best state.

[0018] Manufacturing the in-mold injection-molded mesh cloth ring: Mesh cloth pre-treatment: According to the design requirements, cut and clean the nylon mesh cloth, remove impurities, and ensure that the quality and dimension accuracy of the mesh cloth meet the requirements of in-mold injection molding.

[0019] Mold preparation: Debug the mold, check the sealing performance of the mold, the suction of the negative pressure vacuum device, and the smoothness of the injection channel. Apply an appropriate amount of mold release agent on the mold surface to facilitate the subsequent product demolding.

[0020] Injection molding operation: Use a manipulator to accurately place the pre-treated nylon mesh cloth into the mold cavity, start the negative pressure vacuum device of the mold, and adsorb the mesh cloth to fix it in the predetermined position. Then, the injection molding machine injects the molten PP material into the mold at the set temperature, pressure, and speed to fill the gap between the mesh cloth and the mold, and complete the injection molding. After the injection molding is completed, maintain the mold pressure for a period of time to allow the product to fully cool and solidify, and then demold to take out the in-mold injection-molded mesh cloth ring.

[0021] Aluminum foil sealing: Use the hot stamping process to perform hot stamping of aluminum foil on the in-mold injection-molded mesh cloth ring. Adjust the temperature, pressure, and time parameters of the hot stamping aluminum foil equipment to ensure that the aluminum foil is tightly attached to the mesh cloth ring to form a good sealing layer.

[0022] Assembly of the small inner box: Pre-assembly inspection: Conduct visual inspection and dimensional measurement on the two-color inner cover, inner bottom, and in-mold injection-molded mesh ring to ensure that the components are defect-free and the dimensions meet the design requirements.

[0023] Hinge fastening: Align the rear button of the two-color inner cover accurately with the corresponding hinge structure on the inner bottom, gently press to make it fasten tightly, and check the rotational flexibility of the hinge to ensure that the rear button hinge can rotate smoothly for opening and closing.

[0024] Front button fastening: Close the two-color inner cover so that the three fastening points of the front button fit precisely with the fastening positions on the inner bottom, apply appropriate pressure to fasten it, and test the repeated opening and closing performance of the front button to ensure smooth opening and closing and firm fastening.

[0025] Mesh ring installation: After filling the contents, align the in-mold injection-molded mesh ring with the installation position on the inner bottom, and use special tooling or equipment to apply uniform pressure to press it into the inner bottom to ensure tight annular interference and intact aluminum foil seal, forming a reliable second seal.

[0026] Quality inspection: Airtightness inspection: Use airtightness inspection equipment to conduct airtightness tests on the assembled airtight small inner box. Fill the small inner box with gas at a certain pressure and detect whether there is gas leakage to ensure that the airtightness performance meets the relevant standards.

[0027] Appearance and dimensional inspection: Check the appearance of the small inner box to see if there are defects such as scratches, deformations, and aluminum foil peeling. Use measuring tools to measure key dimensions, such as the length, width, and height of the inner box, and the diameter of the mesh ring, to ensure that the dimensions are within the allowable tolerance range.

[0028] Opening and closing performance inspection: Conduct multiple opening and closing tests on the front button and rear button hinges, check whether the opening and closing are smooth and the fastening is firm, record the number of opening and closing times and the problems that occur, and screen and process unqualified products.

[0029] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An in-mold injection molded airtight small inner box with a mesh cloth ring, characterized in that, It includes a two-color inner cover, an inner bottom, and an in-mold injection molded mesh cloth ring; the two-color inner cover is injection molded in two colors with a PP one-color cover and a TPE sealing ring, and the in-mold injection molded mesh cloth ring is injection molded with a PP ring and a nylon mesh cloth in the mold and is sealed by hot stamping aluminum foil; the two-color inner cover and the inner bottom are buckled by a rear button hinge, and after the cover is closed, the front button is buckled by three buckling points. The TPE sealing ring of the inner cover interferes with the inner bottom to form the first airtight structure. After the in-mold injection molded mesh cloth ring is filled with the filling content, it is pressed into the inner bottom, and the second airtight structure is formed through annular interference and aluminum foil sealing.

2. The airtight small inner box with an in-mold injection molded mesh ring according to claim 1, characterized in that, The manufacturing process of the in-mold injection molded mesh cloth ring is as follows: use a manipulator to place the nylon mesh cloth in the mold, adsorb the nylon mesh cloth through the negative pressure vacuum device of the mold, and then inject PP material for injection molding to integrate the nylon mesh cloth and the PP ring into one body.

3. The airtight small inner box with an in-mold injection-molded mesh cloth ring according to claim 1, wherein The front button has a repeated opening and closing function, and the rear button hinge can be rotated to open and close.

4. A manufacturing method of an airtight small inner box with an in-mold injection-molded mesh cloth ring, characterized in that, It includes the following steps: Manufacture the two-color inner cover: adopt the two-color injection molding process to injection mold the PP material and the TPE material into the two-color inner cover; Manufacture the in-mold injection molded mesh cloth ring: after pre-treating the nylon mesh cloth, use a manipulator to put it into the mold, adsorb the mesh cloth by the negative pressure of the mold, inject the PP material for injection molding, and then perform hot stamping aluminum foil sealing; Assemble the small inner box: first buckle the two-color inner cover and the inner bottom by the rear button hinge, then buckle the front button, and press the in-mold injection molded mesh cloth ring into the inner bottom after filling the content; Quality inspection: conduct airtight inspection, appearance and dimension inspection, and opening and closing performance inspection on the assembled small inner box.

Images