Forming equipment for producing plastic cup with hollow layer

Abstract

The utility model discloses forming equipment for producing a plastic cup with a hollow layer, which comprises an upper die holder, a lower die holder, a material pressing ring, a forming die body and a cup ejecting module, the upper die holder is arranged above the lower die holder in a liftable manner, a first inner cavity is arranged in the upper die holder, the material pressing ring is inserted into an opening of the first inner cavity in a sliding manner, and the forming die body is arranged in the first inner cavity. The forming die body is arranged in the first inner cavity in a liftable mode, a positive pressure forming air chamber is arranged in the first inner cavity, positive pressure air flow is input into the positive pressure forming air chamber through an external air source, and the positive pressure air flow flows to the second inner cavity through the annular channel, so that a sheet is attached to the second inner cavity to form an outer cup body. And during secondary mold closing, the negative pressure part adsorbs the sheet on the forming mold body under the action of the negative pressure generator to form the inner cup body. Compared with the prior art, the plastic cup with the hollow layer is formed by two pressing procedures and the positive and negative pressure forming principle, and the plastic cup has the advantages of being simple and reasonable in structure, low in machining cost, high in working efficiency, good in stability, high in concentricity of the formed inner cup body and the formed outer cup body and good in visual effect.

Description

Technical Field

[0001] The utility model relates to the technical field of cup making machines, in particular to a forming device for producing plastic cups with hollow layers. Background Art

[0002] Double-layer plastic cups with a hollow insulation layer are widely used in hot beverage packaging (such as coffee and milk tea cups) due to their excellent heat insulation, scald protection, and pleasant grip. These cups typically consist of coaxially arranged inner and outer walls, forming a sealed hollow layer between them.

[0003] At present, the mainstream processes for producing such hollow cups on the market mainly rely on the following two methods:

[0004] Separate manufacturing followed by assembly: This process requires the separate production of the inner and outer cups. First, the inner cup is produced using a first cup-making machine; second, the outer cup is produced using a second cup-making machine. Finally, additional assembly equipment (such as manual or robotic) is required to precisely insert the inner cup into the outer cup. The inner and outer cups are then secured and sealed at the rim and / or bottom of the cup using methods such as heat fusion, bonding, or mechanical snap fastening to form a closed hollow layer. The main disadvantages of this process are:

[0005] 1. The equipment requirements are many and the process is complicated. At least two independent cup-making equipment and one set of assembly equipment are required, which results in large equipment investment and occupies a lot of space.

[0006] 2. Production efficiency is limited and costs are high. The production process involves multiple transfer, positioning and assembly steps. The process is long, production efficiency is difficult to improve significantly, and the cost of manual or automated assembly is high.

[0007] 3. Concentricity is difficult to precisely control: The inner and outer cups are manufactured separately and then assembled. Even with precise positioning fixtures, it is difficult to completely prevent slight eccentricity or tilt between the inner and outer cups during assembly. This concentricity deviation not only affects the product's appearance and user experience, but more importantly, it can lead to uneven thickness of the hollow layer, which in turn affects the stability of its thermal insulation performance and the structural strength of the cup body.

[0008] There are also complex co-extrusion blow molding / injection molding, however, this type of technical solution exists:

[0009] 1. The equipment and molds are extremely complex and expensive, requiring specially designed extruder heads or injection molds that can handle multiple layers of melt simultaneously, which are expensive to manufacture and maintain.

[0010] 2. The process control is difficult, and the requirements for the fluidity, temperature, and pressure matching of the multi-layer melt are extremely high. The process window is narrow, and the yield control is very challenging.

[0011] 3. Product design is limited, making it difficult to achieve a clear and reliable sealing structure between the cup mouth and the cup bottom, especially for cups that require a specific shape (such as a tapered cup) or a thin-walled design.

[0012] 4. It is also difficult to ensure high concentricity. Although it is formed in one go, during the complex melt flow and cooling process, the inner and outer wall layers may also have unsatisfactory concentricity due to factors such as uneven shrinkage.

[0013] In summary, the prior art lacks an equipment solution that can produce hollow cups efficiently and at low cost while ensuring high concentricity between the inner cup and the outer cup. Utility Model Content

[0014] The technical problem to be solved by the utility model is to provide a forming device for producing plastic cups with hollow layers.

[0015] In order to achieve the above-mentioned purpose, the utility model discloses a molding device for producing plastic cups with hollow layers, including an upper mold base, a lower mold base, a pressure ring, a molding mold body and a top cup module. The upper mold base can be raised and lowered above the lower mold base, and a first inner cavity is provided in the upper mold base. The pressure ring is slidably inserted at the opening of the first inner cavity, and the molding mold body is telescopically provided in the first inner cavity. A positive pressure molding air chamber is provided in the first inner cavity.

[0016] A second inner cavity is provided in the lower die seat, an annular channel communicating with the positive pressure forming air chamber and the second inner cavity is provided at the bottom of the press ring, and a negative pressure portion is provided on the outer wall of the forming die body.

[0017] The lower mold base is driven by the first lifting drive device to close the mold with the upper mold base, and the sheet is pressed against the top surface of the lower mold base by the pressure ring. The forming mold body is driven downward by the second lifting drive device to stretch the sheet into the second inner cavity. The positive pressure forming air chamber inputs positive pressure airflow through the external air source, and flows to the second inner cavity through the annular channel, so that the sheet is attached to the second inner cavity to form an outer cup body. During the second mold closing, the negative pressure part adsorbs the sheet onto the forming mold body under the action of the negative pressure generator to form an inner cup body. At the same time, the edge of the inner cup body is pressed against the edge of the outer cup body through the pressure ring, thereby forming a plastic cup with a hollow layer.

[0018] The cup-pushing module is movably arranged at the bottom of the second inner cavity, and the formed plastic cup is pushed upward out of the second inner cavity by the cup-pushing module.

[0019] Furthermore, the positive pressure forming air chamber is formed between the top of the pressing ring and the top of the first inner cavity.

[0020] Furthermore, an annular groove is provided on the inner circumference of the pressing ring, and the annular channel is communicated with the annular groove and is opposite to the second inner cavity in upper and lower directions.

[0021] Furthermore, a mold movable plate is vertically movable above the upper mold base, the mold movable plate is connected to the forming mold via a movable rod, and the second lifting drive module drives the mold movable plate to move vertically.

[0022] Furthermore, an exhaust channel is provided in the movable rod, a top end of the exhaust channel is communicated with the top of the mold movable plate, and the negative pressure portion is communicated with the exhaust channel.

[0023] Furthermore, an upper cutting edge plate is provided on the bottom surface of the upper die base, and a lower cutting edge plate is provided on the top surface of the lower die base. When the upper die base and the lower die base are closed, the material is sliced ​​by the upper cutting edge plate and the lower cutting edge plate. The pressure ring is slidably inserted into the first inner cavity and the upper cutting edge plate, and the bottom of the pressure ring protrudes from the bottom of the upper cutting edge plate.

[0024] Furthermore, the cup-lifting module includes a cup-lifting rod, which is liftably arranged in the second inner cavity, and a cup body cavity is formed between the top of the cup-lifting rod and the inner wall of the second inner cavity. The cup-lifting rod is driven to move vertically by the third lifting drive device.

[0025] Compared with the prior art, the beneficial effects of the present invention are: an annular channel and an annular groove are provided in the pressing ring and cooperate with the positive pressure molding air chamber of the upper mold base. When the upper mold base and the lower mold base are closed, positive pressure is formed in the cup molding cavity; the molding mold body is provided with a negative pressure part and cooperates with a movable rod with an exhaust channel, so that a negative pressure area is formed on the outer wall of the molding mold body. A two-step pressing process and positive and negative pressure molding principles are used to form a plastic cup with a hollow layer. The plastic cup has a simple and reasonable structure, low processing cost, high work efficiency and good stability, high concentricity of the inner and outer cup bodies after molding, and good visual effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a cross-sectional view of the overall structure of this embodiment;

[0027] Figure 2 for Figure 1 Enlarged view of part A in the middle;

[0028] Figure 3 This is a flow chart of the positive pressure forming process of this embodiment;

[0029] Figure 4 This is a flow chart of the negative pressure forming process of this embodiment;

[0030] Figure 5This is a schematic diagram of the cup ejecting module of this embodiment ejecting the formed plastic cup. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the present invention clearer, Figure 1-Figure 5 The utility model is further described in detail with reference to the accompanying drawings.

[0032] Reference Figure 1 As shown, a molding device for producing hollow plastic cups includes an upper mold base 1, a lower mold base 2, a press ring 3, a molding die 4, and a cup-lifting module 5. The upper mold base 1 is arranged above the lower mold base 2 in a liftable manner. The bottom surface of the upper mold base 1 is provided with an upper blade plate 11, and the top surface of the lower mold base 2 is provided with a lower blade plate 21.

[0033] The specific structures of the upper blade plate 11 and the lower blade plate 21 of this embodiment refer to the blade structure disclosed in a container forming device that is easy to control the cup rim thickness in Chinese Patent Publication No. "CN211307350U", which will not be elaborated here.

[0034] A first inner cavity 12 is provided in the upper die base 1 , and a second inner cavity 22 is provided in the lower die base 2 . Specifically, the first inner cavity 12 and the second inner cavity 22 are opposite to each other in upper and lower directions.

[0035] The outer contour of the forming mold 4 in this embodiment corresponds to the outer shape of the plastic cup after forming.

[0036] The binder ring 3 is slidably inserted into the first inner cavity 12 and the upper blade plate 11. Specifically, the bottom of the binder ring 3 protrudes from the bottom of the first blade plate 11. The lower die base 2 is driven by a first lift drive module (not shown) to move up and down so that the bottom of the binder ring 3 contacts or moves away from the top of the opening of the second inner cavity 22.

[0037] Furthermore, the top of the upper mold base 1 is fixedly set on the upper mold platform (not shown in the figure), and the bottom of the lower mold base 2 is fixedly set on the lower mold platform (not shown in the figure). The first lifting drive module drives the lower mold platform to perform a lifting action to drive the lower mold 2 to be molded with the upper mold base 1.

[0038] The forming die 4 is driven by a second lifting drive module (not shown in the figure) to move vertically, so that it is movably disposed in the first inner cavity 12 or moves vertically downward to the second inner cavity 22 .

[0039] Specifically, a mold movable plate 13 is vertically movable above the upper mold base 1 , and the mold movable plate 13 is connected to the forming mold 4 via a movable rod 14 . The second lifting drive module drives the mold movable plate 13 to move vertically.

[0040] The top of the movable rod 14 is fixedly connected to the bottom of the mold movable plate 13, and the other end thereof passes through the top of the upper mold base 1 and is fixedly connected to the top of the forming mold body 4. The outer periphery of the movable rod 14 is slidably connected to the top of the upper mold base 1 through a guide copper sleeve.

[0041] Furthermore, a negative pressure portion (not shown in the figure) is provided on the outer wall of the molding mold 4, and an exhaust channel 141 is provided in the movable rod 14. The top of the exhaust channel 141 is connected to the top of the mold movable plate 13, and the top of the exhaust channel 141 is externally connected to a negative pressure generating device, and the negative pressure portion is connected to the exhaust channel 141.

[0042] Reference Figure 1 and Figure 2 As shown, the upper half of the first inner cavity 12 serves as the positive pressure forming chamber 121. The inner circumference of the binder ring 3 is provided with an annular groove 31, and the bottom surface of the binder ring 3 is provided with an annular channel 32, which is in communication with the annular groove 31. In this embodiment, the annular channel 32 is vertically opposed to the second inner cavity 22 to ensure that the gas source in the positive pressure forming chamber 121 flows through the annular channel 32 to the second inner cavity 22.

[0043] In this embodiment, the gas source is input into the positive pressure molding chamber 121 through an external gas source device.

[0044] The cup-lifting module 5 includes a cup-lifting rod 51, a cup-lifting plate 52 and a third lifting drive device (not shown in the figure). The cup-lifting rod 51 is arranged in a liftable manner in the second inner cavity 22, and the outer periphery of the cup-lifting rod 51 is slidably connected to the bottom of the lower mold base 2 through a guide copper sleeve.

[0045] In the initial state, the top of the cup-lifting rod 51 is located at the bottom of the second inner cavity 22. A cup body cavity 6 is formed between the top of the cup-lifting rod 51 and the inner wall of the second inner cavity 22. In this embodiment, the outer contour of the top of the cup-lifting rod 51 corresponds to the bottom of the molded plastic cup.

[0046] A limit rod 23 is vertically provided at the bottom of the lower mold base 2. A cup-lifting plate 52 is vertically movable and disposed below the lower mold base 2. Specifically, one side of the cup-lifting plate 52 is slidably connected to the limit rod 23, and the bottom end of the cup-lifting rod 51 is fixedly connected to the cup-lifting plate 52. The third lifting drive device is used to drive the cup-lifting plate 52 to move vertically along the limit rod 23, so that the top end of the cup-lifting rod 51 moves vertically upward from the bottom of the second inner cavity 22 to the opening of the second inner cavity 22 or resets.

[0047] The lifting drive devices mentioned in this embodiment are all common drive structures such as cylinders that are commonly used to drive vertical motion and will not be elaborated here.

[0048] A limiting portion 231 is provided on the periphery of the bottom end of the limiting rod 23 , and a limiting recess 521 matching the limiting portion 231 is provided on the bottom of the top cup plate 52 . The limiting recess 521 is plugged into and matched with the limiting portion 231 to achieve a limiting effect.

[0049] Furthermore, a cooling unit 24 is provided within the lower mold base 2. The cooling unit 24 is arranged in a ring shape with the cup cavity 6 as the center. The cooling unit 24 cools the sheet material within the molding cavity during molding. The cooling unit 24 is connected to a liquid supply module via a pipe, and either a coolant or water is supplied to the cooling unit 24 through the liquid supply module.

[0050] Reference Figure 1-Figure 5 As shown, the working steps of this molding equipment are:

[0051] S1, the heated first sheet is transported between the upper die base 1 and the lower die base 2 and enters the positive pressure forming process;

[0052] S2, the first lifting drive device drives the lower die base 2 to move vertically toward the upper die base 1, so that the pressing ring 3 presses the sheet material onto the top surface of the lower die base 2, and at the same time, the upper blade plate 11 and the lower blade plate 21 are used to cut off excess sheet material;

[0053] S3, the second lifting drive device drives the forming die 4 to move downward from the first inner cavity 12 into the forming cavity. During the downward movement of the forming die 4, the sheet is synchronously stretched downward into the forming cavity.

[0054] S4. The positive pressure air source in the positive pressure molding chamber 121 flows through the annular groove 31 and the annular channel 32 into the cup body cavity 6 and acts on the sheet material so that it adheres to the inner wall of the cup body cavity 6. The sheet material is then cooled by the cooling unit 24 to form the outer cup body 7. At this point, the positive pressure molding process is completed.

[0055] S5, the forming die body 4 and the upper die base 1 are reset respectively;

[0056] S6, the heated second sheet is transported between the upper die base 1 and the lower die base 2 and enters the negative pressure forming process;

[0057] S7, repeating steps S2 and S3, and compounding the top surfaces of the first sheet and the second sheet under the action of the binder ring 3;

[0058] S8, the negative pressure part generates negative pressure so that the second sheet material is closely attached to the forming mold 4 to form the inner cup 8;

[0059] S9, the molding die 4 and the upper die base 1 are reset respectively, and the upper die base 1 is driven upward by the first lifting drive device so that the distance between the upper die body and the lower die body is greater than the height of a molded plastic cup, providing working space for the subsequent cup-lifting process;

[0060] S10, the third lifting drive device drives the cup-pushing plate 52 to move upward, so that the cup-pushing rod 51 moves upward from the bottom of the second inner cavity 22 to the opening of the second inner cavity 22, and then pushes the molded plastic cup 9 out of the second inner cavity 22.

[0061] This embodiment optimizes the equipment structure so that the same equipment can perform positive pressure molding and negative pressure molding processes respectively, so that the plastic cups after molding form a hollow layer. The plastic cups with the hollow layer have a scalding-proof effect.

[0062] Specifically, an annular channel and an annular groove are provided in the pressing ring and cooperate with the positive pressure molding air chamber of the upper mold base. When the upper mold base and the lower mold base are closed, positive pressure is formed in the cup molding cavity; the molding mold body is provided with a negative pressure part and cooperates with a movable rod with an exhaust channel, so that a negative pressure area is formed on the outer wall of the molding mold body. The two-step pressing process and the positive and negative pressure molding principle are used to form a plastic cup with a hollow layer. The plastic cup has a simple and reasonable structure, low processing cost, high work efficiency and good stability, high concentricity of the inner and outer cup bodies after molding, and good visual effect.

[0063] Of course, the above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with this technology to understand the content of the utility model and implement it accordingly. They cannot be used to limit the scope of protection of the utility model. Any modifications made according to the spirit of the main technical solution of the utility model should be included in the scope of protection of the utility model.

Claims

1. A forming device for producing a hollow layer plastic cup, characterized in that: The present invention comprises an upper die base (1), a lower die base (2), a pressure ring (3), a forming die body (4) and a top cup module (5), wherein the upper die base (1) is arranged above the lower die base (2) in a liftable manner, a first inner cavity (12) is arranged in the upper die base (1), the pressure ring (3) is slidably inserted in the opening of the first inner cavity (12), the forming die body (4) is arranged in the first inner cavity (12) in a telescopic manner, and a positive pressure forming air chamber (121) is arranged in the first inner cavity (12); A second inner cavity (22) is provided in the lower die base (2), an annular channel (32) communicating with the positive pressure forming air chamber (121) and the second inner cavity (22) is provided at the bottom of the pressure ring (3), and a negative pressure portion is provided on the outer wall of the forming die body (4); The lower die base (2) is driven by the first lifting drive device to close the mold with the upper die base (1), and the sheet is pressed against the top surface of the lower die base (2) by the pressure ring (3). The forming die body (4) is driven downward by the second lifting drive device to stretch the sheet into the second inner cavity (22). The positive pressure forming air chamber (121) inputs positive pressure airflow through the external air source and flows to the second inner cavity (22) through the annular channel (32) so that the sheet is attached to the second inner cavity (22) to form an outer cup body (7). During the second closing of the mold, the negative pressure part adsorbs the sheet onto the forming die body (4) under the action of the negative pressure generator to form an inner cup body (8). At the same time, the edge of the inner cup body (8) is pressed against the edge of the outer cup body (7) through the pressure ring (3), thereby forming a plastic cup (9) with a hollow layer. The cup-lifting module (5) is movably arranged at the bottom of the second inner cavity (22), and the formed plastic cup (9) is pushed upward out of the second inner cavity (22) through the cup-lifting module (5).

2. The forming equipment for producing a hollow plastic cup according to claim 1, characterized in that: The positive pressure forming air chamber (121) is formed between the top of the pressing ring (3) and the top of the first inner cavity (12).

3. The forming equipment for producing a hollow layer plastic cup according to claim 1 or 2, characterized in that: An annular groove (31) is provided on the inner circumference of the pressing ring (3), and the annular channel (32) is in communication with the annular groove (31) and is vertically opposed to the second inner cavity (22).

4. The forming equipment for producing a hollow layer plastic cup according to claim 1, characterized in that: A mold movable plate (13) is provided above the upper mold base (1) for vertical movement. The mold movable plate (13) is connected to the forming mold (4) via a movable rod (14). The mold movable plate (13) is driven to move vertically by a second lifting drive module.

5. The forming equipment for producing a hollow plastic cup according to claim 4, characterized in that: An exhaust channel (141) is provided in the movable rod (14), the top end of the exhaust channel (141) is in communication with the top of the mold movable plate (13), and the negative pressure portion is in communication with the exhaust channel (141).

6. The forming equipment for producing a hollow layer plastic cup according to claim 1, characterized in that: The bottom surface of the upper die base (1) is provided with an upper blade plate (11), and the top surface of the lower die base (2) is provided with a lower blade plate (21). When the upper die base (1) and the lower die base (2) are clamped, the material is sliced ​​by the upper blade plate (11) and the lower blade plate (21). The pressure ring (3) is slidably inserted into the first inner cavity (12) and the upper blade plate (11), and the bottom of the pressure ring (3) protrudes from the bottom of the upper blade plate (11).

7. The forming equipment for producing a hollow layer plastic cup according to claim 1, characterized in that: The cup-lifting module (5) comprises a cup-lifting rod (51), which is arranged in a liftable manner in the second inner cavity (22), and a cup-shaped cavity (6) is formed between the top end of the cup-lifting rod (51) and the inner wall of the second inner cavity (22), and the cup-lifting rod (51) is driven to move vertically by a third lifting drive device.

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