Composite inner cup manufacturing method and composite double-layer cup manufacturing method

Abstract

The invention relates to a manufacturing method of a composite inner cup and a manufacturing method of a composite double-layer cup, which mainly comprises the following steps of: prefabricating a metal cup body with a top convex ring, firstly putting a lower ring into a mold, then putting the metal cup body into the mold so that the lower ring is positioned at the bottom edge of the top convex ring, and then arranging an upper ring on the inner side of the top convex ring, the upper ring and the lower ring are clamped when the mold is closed, the top convex ring of the metal cup body is positioned by the upper ring and the lower ring, and then injection processing is performed on the mold corresponding to the periphery of the top convex ring of the metal cup body, so that the cup edge part is injected and integrated with the upper ring and the lower ring to wrap the top convex ring, and the manufacturing of the inner cup is completed; therefore, the outer cup made of the same material as the cup edge part of the inner cup is processed and combined into the composite double-layer cup through ultrasonic welding, so that the composite double-layer cup has the advantages and effects of reducing processing procedures and being safe, non-toxic and sanitary in use.

Description

Technical Field

[0001] The present invention relates to a composite inner cup and a double-layer cup manufacturing method, and in particular to a manufacturing method of a composite double-layer cup using a metal inner cup and a plastic outer cup. Background Art

[0002] Existing thermos cups are mostly made of plastic, stainless steel or ceramic. Plastic thermos cups are not heat-resistant and easily release toxic components when heated, making them unsuitable for holding beverages such as tea and coffee. Stainless steel thermos cups are mostly made of double-layer cups using vacuum technology, which has high production costs. In addition, in recent years, ceramic thermos cups have good texture, good heat preservation effect, and do not release heavy metals or toxic components when used to hold hot drinks, and are widely favored by consumers.

[0003] Current eco-friendly and thermos cups, designed for holding hot beverages like coffee and tea, all utilize a double-layer structure. This space between the inner and outer cups reduces heat transfer, allowing the heat from the inner cup to reach the outer cup more slowly or even involuntarily, thus preventing the cup from being too hot to hold. The most pressing challenge with double-layer cups is connecting the two cups, followed by ensuring that liquid does not seep into the gap between them. Using the same plastic material for both cups and injection molding can lead to uneven wall thicknesses, resulting in different shrinkage rates after injection molding, leading to dimensional misalignment between the two cups and affecting the precision and quality of the finished double-layer cup. Consequently, most plastic double-layer cups utilize high-frequency welding to bond the inner and outer cups, or, as in Taiwan Patent Publication No. TWM639368U, which discloses a screw-type assembly that allows for easy separation and assembly of the inner and outer cups.

[0004] However, the aforementioned plastic inner cups are not heat-resistant and easily release toxic substances when heated. Furthermore, the screw-on, detachable cup body does not provide adequate insulation. Consequently, the industry has been actively developing composite double-layer cups that utilize a plastic ring glued to the open end of the metal inner cup, securing it to the plastic outer cup. However, this technology has the following drawbacks, as explained below:

[0005] 1. Complex processing procedures - a plastic ring must first be prepared with a groove that fits into the metal inner cup. An adhesive that can bond with the metal outer cup is then applied to the groove, and then the ring is fixed by manual gluing. This process is complex and wastes labor costs and processing time.

[0006] 2. Frequent use of the metal inner cup between hot and cold temperatures can easily cause the adhesive to deteriorate or dissolve. Relatively speaking, the dissolved adhesive is harmful to the human body.

[0007] 3. When the adhesive deteriorates or dissolves, the gaps created are easy to harbor dirt and are difficult to clean, making it unhygienic to use.

[0008] Therefore, in view of this, the inventors, based on their rich experience in design, development and actual production in the relevant industry for many years, provide a method for manufacturing a composite inner cup and a double-layer cup, in order to achieve the purpose of better practical value. Summary of the Invention

[0009] The main purpose of the present invention is to provide a method for manufacturing a composite inner cup and a composite double-layer cup, especially a method for manufacturing a composite double-layer cup with a metal inner cup and a plastic outer cup.

[0010] The main purpose and effect of the composite inner cup and double-layer cup manufacturing method of the present invention are achieved by the following specific technical means:

[0011] The invention mainly prefabricates a metal cup body with a top protruding ring, first places a lower ring in a mold, and then places the metal cup body so that the lower ring is located at the bottom edge of the top protruding ring, and then places an upper ring on the inner side of the top protruding ring. When the mold is closed, the upper ring and the lower ring are clamped, and the top protruding ring of the metal cup body is positioned by the upper ring and the lower ring. Then, the mold is subjected to injection molding corresponding to the circumference of the top protruding ring of the metal cup body to inject the cup rim and integrate it with the upper ring and the lower ring to cover the top protruding ring, thereby completing the production of an inner cup; thereby, the outer cup made of the same material as the rim of the inner cup can be ultrasonically welded to form a composite double-layer cup, thereby achieving the advantages and functions of reducing processing procedures and being safe, non-toxic and hygienic in use.

[0012] The preferred embodiment of the composite inner cup and double-layer cup manufacturing method of the present invention, wherein the composite double-layer cup mainly includes an inner cup and an outer cup, the inner cup and the outer cup are made of different materials and are combined together.

[0013] The preferred embodiment of the composite inner cup and double-layer cup manufacturing method of the present invention is that the inner cup is manufactured by S1 prefabricating a metal cup body, S2 preparing a mold, S3 inserting upper and lower rings, S4 closing the mold, and S5 injection molding.

[0014] In a preferred embodiment of the method for manufacturing a composite inner cup and a double-layer cup of the present invention, a metal cup body is prefabricated in the step S1 of prefabricating a metal cup body, and an annular top protrusion ring is formed at the opening of the metal cup body.

[0015] A preferred embodiment of the method for manufacturing a composite inner cup and a double-layer cup of the present invention, wherein a female mold and a corresponding male mold are provided in the mold preparation step S2, the female mold having a mold cavity for the metal cup body to be placed in, a cup rim space forming the cup rim portion is provided in the mold cavity corresponding to the top convex ring of the metal cup body, and a stepped bottom edge is formed between the cup rim space and the mold cavity, the male mold having a module corresponding to the mold cavity, the module forming a stepped pressing edge at the cup rim space.

[0016] A preferred embodiment of the method for manufacturing a composite inner cup and a double-layer cup of the present invention, wherein in the step S3 of inserting the upper and lower rings, an upper ring and a lower ring made of the same material as the cup rim are prefabricated, the lower ring is inserted at the bottom edge of the mold cavity, and the metal cup body is inserted into the mold cavity of the mother mold, so that the top protruding ring of the metal cup body is pressed against the lower ring, and then the upper ring is inserted on the inner end face of the top protruding ring.

[0017] In a preferred embodiment of the method for manufacturing a composite inner cup and a double-layer cup of the present invention, in the mold closing step S4, the male mold is closed correspondingly to the female mold so that the pressing edge thereof presses against the upper ring.

[0018] In a preferred embodiment of the composite inner cup and double-layer cup manufacturing method of the present invention, in the S5 injection molding step, plastic is injected into the cup edge space and fused with the upper ring and the lower ring to form the cup edge portion, and the cup edge portion is allowed to cover the top protruding ring to complete the inner cup production.

[0019] In a preferred embodiment of the composite inner cup and double-layer cup manufacturing method of the present invention, the rim of the inner cup and the outer cup are combined together through the S6 outer cup prefabrication step and the S7 double cup combination step, and the rim of the outer cup and the rim of the inner cup are combined by ultrasonic welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the drawings are merely illustrative and are used to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to specific circumstances under the guidance of the present invention.

[0021] Figure 1 Schematic diagram of the process flow of the present invention;

[0022] Figure 2 This is a schematic diagram of the inner cup composition and mold structure of the present invention;

[0023] Figure 3 This is a schematic sectional view of the inner cup components and mold structure of the present invention;

[0024] Figure 4Schematic diagram of the mold closing steps of the present invention;

[0025] Figure 5 Schematic diagram of the injection molding steps of the present invention;

[0026] Figure 6 This is a schematic diagram of the appearance of the inner cup of the present invention;

[0027] Figure 7 This is a schematic cross-sectional view of the inner cup of the present invention;

[0028] Figure 8 This is a schematic diagram of the inner cup and outer cup of the present invention (prefabricated outer cup);

[0029] Figure 9 Schematic diagram of the steps of combining two cups of the present invention.

[0030] Description of Reference Numerals

[0031] 1: Inner cup

[0032] 10:Metal cup body

[0033] 101: Top convex ring

[0034] 11: Cup rim

[0035] 12: Sheung Wan

[0036] 13: Lower Ring

[0037] 2:Outer cup

[0038] 3:Mold

[0039] 31: Master mold

[0040] 311:Mold cavity

[0041] 312: Cup rim space

[0042] 313: bottom edge

[0043] 32:Male model

[0044] 321:Module

[0045] 322: Pressing edge DETAILED DESCRIPTION

[0046] In order to make the technical content, inventive objectives and effects achieved by the present invention more complete and clear, the following detailed description is given, and please refer to the accompanying drawings and figure numbers:

[0047] First, see Figure 1 、 Figure 6 and Figure 8FIG. 1 is a flow chart of the steps of a method for manufacturing a composite inner cup and a double-layer cup according to the present invention. The composite double-layer cup mainly comprises an inner cup 1 and an outer cup 2. The inner cup 1 and the outer cup are made of different materials and are bonded together. The inner cup 1 is mainly formed by injection molding a metal cup body 10 with a cup rim 11 through a mold 3. The steps are as follows:

[0048] S1) Prefabricating a metal cup body - a metal cup body 10 is prefabricated, and an annular top protrusion ring 101 is formed at the opening of the metal cup body 10;

[0049] S2) Preparing a mold - a female mold 31 and a corresponding male mold 32 are provided. The female mold 31 has a mold cavity 311 for receiving the metal cup 10. A cup rim space 312 is provided in the mold cavity 311 corresponding to the top protruding ring 101 of the metal cup 10 to form the cup rim 11. A stepped bottom edge 313 is formed between the cup rim space 312 and the mold cavity 311. The male mold 32 has a module 321 corresponding to the mold cavity 311. The module 321 forms a stepped pressing edge 322 at the cup rim space 312.

[0050] S3) Inserting the Upper and Lower Rings - Prefabricate an upper ring 12 and a lower ring 13 made of the same material as the cup rim 11 , insert the lower ring 13 into the bottom edge 313 of the mold cavity 311 , and insert the metal cup 10 into the mold cavity 311 of the mother mold 31 , allowing the top protruding ring 101 of the metal cup 10 to abut against the lower ring 13 , and then insert the upper ring 12 onto the inner end surface of the top protruding ring 101 ;

[0051] S4) Mold closing—closing the male mold 32 to correspond to the female mold 31 so that the pressing edge 322 presses against the upper ring 12;

[0052] S5) Injection molding - performing injection molding to inject plastic into the cup rim space 312 and fuse it with the upper ring 12 and the lower ring 13 to form the cup rim portion 11, and allow the cup rim portion 11 to cover the top protruding ring 101 to complete the inner cup 1.

[0053] After the inner cup 1 is completed, the outer cup 2 is made in the following steps:

[0054] S6) Prefabricating the outer cup: The outer cup 2 is made of a plastic material different from the metal cup body 10 of the inner cup 1;

[0055] S7) Double cup combination - the inner cup 1 is placed in the outer cup 2 and the opening of the outer cup 2 is combined with the cup edge 11 of the inner cup 1 to complete the production of the double-layer cup.

[0056] Please refer to Figures 1 to 9As shown, when actually operating, a preferred embodiment is listed below for illustration, wherein the inner cup 1 is made of a metal cup body made of stainless steel or titanium metal material, and the outer cup 2 is made of a plastic material such as PP, PE, PA, PET, etc.; when executing the process of the present invention, the inner cup 1 is first made, and the inner cup 1 first undergoes step S1, first using the above-mentioned material to pre-make a metal cup body 10, and the metal cup body 10 is forged at the opening to form an annular top protrusion ring 101; then, because the inner cup 1 and the outer cup 2 are made of different materials and are not easy to combine or have difficulty in combining, a protrusion is made on the edge of the opening of the inner cup 1 that can be combined with the outer cup 2 The cup rim 11 is combined with each other, and forming the cup rim 11 requires preparing a mold 3 through step S2. The mold 3 includes a female mold 31 and a male mold 32. The shape of the inner cup 1 is constructed in the mold 3, that is, a mold cavity 311 that can be placed in the metal cup body 10 is constructed in the female mold 31. Relatively speaking, the male mold 32 is provided with a module 321 corresponding to the mold cavity 311, and then a cup rim space 312 for forming the cup rim 11 is made in the mold cavity 311. After the cup rim space 312 is formed, a stepped bottom edge 313 is formed between the mold cavity 311, and the module 321 forms a stepped pressing edge 322 corresponding to the cup rim space 312.

[0057] Before the metal cup 10 is placed in the mold 3, a lower ring 13 is first placed at the bottom edge 313 of the mold cavity 311. The lower ring 13 is made of the same material as the cup rim 11 and is pre-formed. The metal cup 10 is then placed in the mold cavity 311 of the female mold 31, and the top protruding ring 101 of the metal cup 10 is pressed against the lower ring 13. Then, an upper ring 12 is placed on the inner end face of the top protruding ring 101. The upper ring 12 is made of the same material as the cup rim 11 and is pre-formed as the above-mentioned lower ring 13. This completes step S3. Continuing in the injection molding process, the male mold 32 is aligned with the female mold 31 to complete step S4 of the mold closing process, so that the pressing edge 322 presses against the upper ring 12.

[0058] After the mold is closed, step S5 is performed. Plastic is injected into the cup edge space 312 through injection molding technology. The high-temperature hot-melt plastic fuses with the upper ring 12 and the lower ring 13 to form the cup edge portion 11. The cup edge portion 11 covers the top protruding ring 101 of the metal cup body 10. After demolding, the inner cup 1 is completed (such as Figure 6 、 Figure 7 shown).

[0059] The open end of the finished inner cup 1 has a cup rim 11 made of the same material as the outer cup 2, and can be combined with the outer cup 2 through the cup rim 11. The step is S6, in which an outer cup 2 is prefabricated. The outer cup 2 and the metal cup body 10 of the inner cup 1 are made of different materials, and the outer cup 2 is made of plastic. Then, the inner and outer cups are combined. In step S7, the inner cup 1 is placed in the outer cup 2 and combined with the cup rim 11 of the inner cup 1 at the opening of the outer cup 2. Here, the cup rims 11 of the outer cup 2 and the inner cup 1 are both made of plastic. They can be combined by processing to combine the inner cup 1 and the outer cup 2 to complete the production of a composite double-layer cup (such as Figure 9 shown).

[0060] The above experiments demonstrate the practical application scope of the present invention, but are not intended to limit the scope of the present invention in any form. However, the aforementioned embodiments and drawings do not limit the product structure or usage of the present invention. Any appropriate changes or modifications by those skilled in the art should be considered as not departing from the scope of protection of the present invention.

[0061] The technical features of the present invention can produce the following advantages:

[0062] 1. The inner cup and double-layer cup manufacturing method of the present invention, through the design of the upper and lower rings, can be directly wrapped around the cup rim through injection molding, eliminating the need for manual gluing and assembly, thereby reducing processing procedures, human resources, and costs.

[0063] 2. The manufacturing method of the inner cup and double-layer cup of the present invention is the same as that described above, but does not require the use of glue, and is safe, non-toxic, and hygienic in use.

[0064] 3. The inner cup and double-layer cup manufacturing method of the present invention, through the design of the upper and lower rings, enables the pressing edge of the male mold to press against the upper ring when the mold is closed, and the metal cup body applies pressure to the lower ring. The closing pressure falls on the upper and lower rings, and will not cause deformation of the metal cup body or leakage problems caused by poor sealing in the future.

[0065] In summary, the embodiments of the present invention can indeed achieve the expected efficacy. The specific structure disclosed therein has not only never been seen in similar products, but has also not been disclosed before the application, and thus fully complies with the provisions and requirements of the Patent Law.

Claims

1. A method for manufacturing a composite inner cup, characterized in that: The rim of a metal cup is injection molded through a mold. The steps are as follows: S1) Prefabricating a metal cup: Prefabricate a metal cup, and form an annular top protrusion ring at the opening of the metal cup; S2) preparing a mold: providing a female mold and a corresponding male mold, the female mold having a mold cavity for receiving the metal cup body, a cup rim space for forming a cup rim portion in the mold cavity corresponding to the top protruding ring of the metal cup body, and a stepped bottom edge formed between the cup rim space and the mold cavity, and a module corresponding to the mold cavity in the male mold, the module forming a stepped pressing edge at the cup rim space; S3) Inserting the upper and lower rings: Prefabricate an upper ring and a lower ring, insert the lower ring into the bottom edge of the mold cavity, and insert the metal cup into the mold cavity of the mother mold, allowing the top protruding ring of the metal cup to abut against the lower ring, and then insert the upper ring onto the inner end surface of the top protruding ring; S4) closing the mold: closing the male mold with the female mold so that the pressing edge presses against the upper ring; S5) Injection molding: performing injection molding to inject plastic into the cup rim space, and allowing the plastic to fuse with the upper ring and the lower ring to form the cup rim portion, and allowing the cup rim portion to cover the top protruding ring.

2. The method for manufacturing a composite inner cup according to claim 1, wherein: The upper ring, the lower ring and the cup edge are made of the same material.

3. A method for manufacturing a composite double-layer cup, characterized in that: The composite double-layer cup comprises an inner cup and an outer cup. The inner cup is made by the method according to claim 1 or 2, and the steps are as follows: S6) Prefabricating the outer cup: The outer cup is made of a plastic material different from the metal cup body of the inner cup; S7) Double cup combination: Place the inner cup into the outer cup and combine the outer cup opening with the inner cup rim to complete the double-layer cup.

4. The method for manufacturing a composite double-layer cup according to claim 3, wherein: The cup rims of the outer cup and the inner cup are made of the same material.

5. The method for manufacturing a composite double-layer cup according to claim 3, wherein: The outer cup and the inner cup are connected by ultrasonic welding.

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