Heat-resistant light environment-friendly PLA coffee durable cup mold

Abstract

The utility model provides a heat-resistant light environment-friendly PLA coffee durable cup mould which comprises an upper mould core arranged on an upper mould and a lower mould core arranged on a lower mould, a first forming surface is arranged at the lower end of the upper mould core, and a second forming surface is arranged at the upper end of the lower mould core. The upper mold core and the lower mold core can be closed, so that a forming cavity is formed between the first forming surface and the second forming surface; the upper mold is provided with a hot nozzle which is communicated with the forming cavity and is used for injecting materials and an inflation port which is used for inflating nitrogen to foam the materials in the forming cavity, the side wall of the upper mold is provided with an air source interface which is used for being connected with a nitrogen source, the air source interface is communicated with the inflation port through an air channel, and the inflation port is provided with a one-way valve which can allow the nitrogen to enter the forming cavity in a one-way mode. The end face of the one-way valve is flush with the upper forming face. The heat-resistant light environment-friendly PLA coffee durable cup mold is compact in structure, low in manufacturing cost, capable of achieving rapid and light-weight manufacturing of products, high in production efficiency and good in product quality.

Description

Technical Field

[0001] This utility model relates to a mold, and more particularly to a heat-resistant, lightweight, environmentally friendly, durable PLA coffee cup mold. Background Technology

[0002] Injection molds are tools used to produce plastic products, and they also give plastic products a complete structure and precise dimensions. Injection molding is a processing method used to mass-produce certain complex-shaped parts. Specifically, it refers to injecting heated and molten plastic into the mold cavity under high pressure by an injection molding machine, and obtaining the molded product after cooling and solidification.

[0003] A heat-resistant, lightweight, environmentally friendly, durable PLA coffee cup has a gradually changing wall thickness, ranging from approximately 0.8 mm in the thinnest part to approximately 2.5 mm in the thickest part. The significant difference in wall thickness means that using ordinary injection molding cannot ensure the flowability and uniformity of the PLA material during the injection molding process, thus affecting the molding quality. At the same time, using ordinary injection molding, due to the large wall thickness, will make the entire cup too heavy, affecting the comfort of use. Utility Model Content

[0004] Technical problems to be solved

[0005] The technical problem to be solved by this utility model is to provide a heat-resistant, lightweight, environmentally friendly, durable PLA coffee cup mold that is compact in structure, easy to assemble, can generate internal foam, and has good injection molding effect.

[0006] Technical solutions to the problem

[0007] This utility model provides a heat-resistant, lightweight, environmentally friendly, durable PLA coffee cup mold, including an upper mold core 3 disposed on an upper mold 1 and a lower mold core 4 disposed on a lower mold 2. The lower end of the upper mold core 3 is provided with a first molding surface, and the upper end of the lower mold core 4 is provided with a second molding surface. The upper mold core 3 can be closed with the lower mold core 4 to form a molding cavity 340 for inverting the cup body between the first molding surface and the second molding surface. The upper mold 1 is provided with a hot nozzle that communicates with the molding cavity 340 and is used for material injection, and an air inlet for filling nitrogen gas to make the material in the molding cavity foam. The side wall of the upper mold 1 is provided with an air source interface for connecting a nitrogen gas source. The air source interface is connected to the air inlet through an air passage. The air inlet is provided with a one-way valve 7 that allows nitrogen gas to enter the molding cavity 340 in one direction. The end face of the one-way valve 7 is flush with the upper molding surface.

[0008] Furthermore, there are at least two air inlets, which are evenly distributed around the circumference of the heating nozzle.

[0009] Furthermore, the heating nozzle and the air inlet are located at the top of the molding cavity.

[0010] Furthermore, the thickness of the molding cavity 340 is greater than or equal to 0.5 mm and less than or equal to 3 mm.

[0011] Furthermore, the upper mold 1 is provided with a positioning seat with a circular cross-section, the bottom surface of the positioning seat serves as the upper forming surface, and the hot nozzle is installed on the positioning seat; the bottom surface of the positioning seat is provided with a circular hole to form the air inlet, the one-way valve 7 is interference-fitted into the air inlet, and the positioning seat is formed with an internal air passage communicating with the air inlet.

[0012] Furthermore, the axis of the air inlet is parallel to the axis of the heating nozzle.

[0013] Furthermore, the positioning seat includes an upper seat body 5 and a lower seat body 6 fixed to the lower end of the upper seat body 5 by bolts. The upper seat body 5 has an upper hot nozzle mounting hole through which a hot nozzle passes, and the lower seat body 6 has a lower hot nozzle mounting hole for inserting the end of the hot nozzle. The bottom surface of the lower hot nozzle mounting hole has an injection hole communicating with the molding cavity 340. The air inlet is located on the bottom surface of the lower seat body 6, and the top surface of the lower seat body 6 has an inner air passage II 60 communicating with the air inlet. The upper seat body 5 has an inner air passage I 50 communicating with the inner air passage II 60. The inner air passage I 50 communicates with the outer air passage 10 in the upper mold.

[0014] Furthermore, the lower end of the upper seat 5 is provided with a positioning boss 51, and the inner air passage I 50 and the upper hot nozzle mounting hole penetrate the end face of the positioning boss 51; the top surface of the lower seat 6 is provided with a positioning groove 6a for inserting the positioning boss 51 and achieving axial positioning, and the inner air passage II 60 and the lower hot nozzle mounting hole are disposed in the positioning groove 6a.

[0015] Furthermore, a positioning component for radial positioning is provided between the side wall of the positioning boss 51 and the inner wall of the positioning groove 6a.

[0016] Furthermore, the positioning component includes a limiting groove 53 disposed on the side wall of the positioning boss 51 and a limiting protrusion 63 disposed on the inner wall of the positioning groove 6a and corresponding to the limiting groove.

[0017] Furthermore, the upper mold includes an upper mold base plate, an upper mold frame, and an upper mold core 3 arranged sequentially from top to bottom. The upper seat 5 is located inside the upper mold frame, and the lower seat 6 is located inside the upper mold core 3.

[0018] Furthermore, the end face of the positioning boss 51 is provided with a sealing ring mounting groove 52, which is coaxial with the air passage 50Ⅰ and is used to install the sealing ring.

[0019] Furthermore, the sidewall of the positioning boss 51 is an inclined plane and the angle between it and the axis is greater than or equal to 3 degrees and less than or equal to 8 degrees.

[0020] Furthermore, the one-way valve 7 includes a cylindrical valve body, in which a valve cavity 720 is formed. The upper end of the valve cavity 720 serves as an air inlet, and the lower end serves as an air outlet. A valve stem 73 is slidably mounted inside the valve cavity 720. The end of the valve stem 73 is provided with a tapered first sealing surface 734, which is smaller at the top and larger at the bottom. The end of the valve cavity 720 is provided with a second sealing surface that can fit with the first sealing surface to achieve a seal. An elastic component is provided inside the valve cavity 720 to give the valve stem 73 an upward movement tendency so that the first sealing surface fits with the second sealing surface to achieve a seal.

[0021] Furthermore, when the valve stem 73 is in the upper limit position, the end of the valve stem 73 is flush with the bottom surface of the valve body.

[0022] Furthermore, a recessed hole is provided on the top of the valve body to form an air inlet 710. The bottom surface of the air inlet 710 is provided with a central hole and an air inlet that communicate with the valve cavity. The valve stem is provided with a valve core 74 that can fit against the top surface of the valve cavity and thus block the air inlet. The upper end of the valve stem 73 is provided with a guide rod 733. The guide rod passes through the central hole and extends into the air inlet 710. The end of the guide rod 733 is provided with a limiting bolt 76 for axial limiting.

[0023] Beneficial effects

[0024] This utility model relates to a heat-resistant, lightweight, environmentally friendly, durable PLA coffee cup mold. An air inlet is provided on the side wall of the molding cavity, allowing high-pressure nitrogen to be injected during molding. This causes the molten material within the molding cavity to foam, uniformly filling the entire cavity and improving product quality while reducing weight. Furthermore, the degree of foaming can be controlled by adjusting the pressure of the high-pressure nitrogen to accommodate products of different specifications and densities. The multi-inlet structure increases air intake and foaming efficiency while reducing internal stress in the molten material, resulting in a more uniform and robust product. This structure also helps shorten the molding cycle and improve production efficiency. A positioning seat serves as the mounting carrier for the hot nozzle and air inlets, significantly reducing manufacturing difficulty and costs, improving product precision, facilitating assembly, and simplifying maintenance, while also reducing usage and maintenance costs. The positioning seat adopts a split structure, further reducing manufacturing costs and improving manufacturing precision, while also facilitating maintenance. This utility model of a heat-resistant, lightweight, environmentally friendly, durable PLA coffee cup mold features a compact structure, low manufacturing cost, and enables rapid and lightweight manufacturing of products with high production efficiency and good product quality. Attached Figure Description

[0025] Figure 1This is a schematic diagram of the structure of the heat-resistant, lightweight, environmentally friendly, durable PLA coffee cup mold of this utility model;

[0026] Figure 2 This is a cross-sectional view of the heat-resistant, lightweight, environmentally friendly, durable PLA coffee cup mold of this utility model;

[0027] Figure 3 for Figure 2 Enlarged view of section A in the middle;

[0028] Figure 4 for Figure 2 Enlarged view of section B in the middle;

[0029] Figure 5 This is a schematic diagram of the upper mold structure of the heat-resistant, lightweight, environmentally friendly, durable PLA coffee cup mold of this utility model;

[0030] Figure 6 for Figure 5 Enlarged view of section C;

[0031] Figure 7 This is a schematic diagram of the lower body of the heat-resistant, lightweight, environmentally friendly, durable PLA coffee cup mold of this utility model;

[0032] Figure 8 This is a schematic diagram of the one-way valve in the heat-resistant, lightweight, environmentally friendly, durable PLA coffee cup mold of this utility model.

[0033] Figure 9 This is a cross-sectional view of the upper mold of the heat-resistant, lightweight, environmentally friendly, durable PLA coffee cup mold of this utility model. Detailed Implementation

[0034] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0035] See Figures 1-9 This utility model provides a heat-resistant, lightweight, environmentally friendly, durable PLA coffee cup mold, including an upper mold 1 and a lower mold 2. The lower mold 2 is located directly below the upper mold, and the two are connected by guide pillars, which can move them closer together or further apart to achieve mold closing or mold opening. The upper mold is a fixed mold, and the lower mold is a movable mold, that is, the lower mold can move. An upper mold core 3 is provided at the lower end of the upper mold 1, and a lower mold core 4 is provided at the upper end of the lower mold 2. A first forming surface is provided at the lower end of the upper mold core 3, and a second forming surface is provided at the upper end of the lower mold core 4. The upper mold core 3 can close with the lower mold core 4, thereby forming a forming cavity 340 between the first forming surface and the second forming surface. The forming cavity 340 is used for cup body inversion forming. The thickness of the forming cavity 340 is greater than or equal to 0.5 mm and less than or equal to 3 mm, and the thickness gradually changes.

[0036] In this application, the upper mold 1 is provided with a hot nozzle and an air inlet communicating with the molding cavity 340. The hot nozzle is used to inject molten material into the molding cavity 340, and the air inlet is used to fill high-pressure nitrogen gas to make the material in the molding cavity foam, so that the material can fully fill the molding cavity and reduce the product density, thereby reducing the overall weight. At the same time, an air source interface is provided on the side wall of the upper mold 1. The air source interface is a screw thread for connecting a nitrogen gas source. The air source interface is connected to the air inlet through an air passage to realize nitrogen gas supply. A one-way valve 7 is provided on the air inlet. The one-way valve 7 allows nitrogen gas to enter the molding cavity 340 unidirectionally from the air passage, and the end face of the one-way valve 7 is flush with the upper molding surface.

[0037] To improve foaming efficiency and effect, in this application, there are at least two air inlets, which are evenly distributed around the circumference of the hot nozzle, preferably two; and the hot nozzle and the two air inlets are located at the top of the molding cavity, that is, at one end of the bottom molding surface of the cup. The air inlets are close to the hot nozzle, resulting in a good molding effect. The diameter of the air inlets is 10mm-20mm.

[0038] To reduce processing difficulty and manufacturing costs, and to facilitate overall assembly, this application includes a positioning seat inside the upper mold 1. The positioning seat has a circular cross-section, i.e., it is cylindrical in shape. The bottom surface of the positioning seat serves as the upper forming surface, or is part of the upper forming surface. The hot nozzle is installed on the positioning seat. Two circular holes are opened on the bottom surface of the positioning seat to form an air inlet. The axis of the air inlet is parallel to the axis of the hot nozzle. A one-way valve 7 is interference-fitted into the air inlet. An internal air passage is formed inside the positioning seat, which communicates with the air inlet for supplying air.

[0039] Specifically, the positioning base includes an upper body 5 and a lower body 6 coaxially arranged, both coaxial with the molding cavity. The lower body 6 is fixed to the lower end of the upper body 5 by several hexagonal socket head cap screws. A central hole is opened on the upper body 5, passing through both ends of the upper body 5, allowing the hot nozzle to pass through. At the same time, a lower hot nozzle mounting hole is opened on the top of the lower body 6, which is coaxial with and connected to the upper hot nozzle mounting hole, allowing the end (head) of the hot nozzle to be inserted. An injection hole is opened on the bottom surface of the lower hot nozzle mounting hole, which is connected to the molding cavity 340, for the hot nozzle to inject material into the molding cavity. An air inlet is located at... The bottom surface of the lower body 6 has an inner air passage II 60 on its top surface. The number of inner air passages II 60 is the same as the number of air inlets, and they correspond one-to-one and are connected. At the same time, an inner air passage I 50 is formed on the upper body 5. The number of inner air passages I 50 is the same as the number of inner air passages II 60, and they correspond one-to-one and are connected. Meanwhile, an outer air passage 10 is formed in the upper mold, with one end extending to the outside of the upper mold and having an internal thread to form an air source interface. There is one outer air passage 10. At the same time, two process holes are set in the upper mold to realize the connection between the outer air passage and the inner air passage, which facilitates processing and manufacturing, and reduces process difficulty and manufacturing cost.

[0040] To facilitate quick and accurate assembly, this application provides a circular boss at the lower end of the upper body 5, forming a positioning boss 51. The sidewall of the positioning boss 51 is sloped, forming a truncated cone structure with a larger lower end and a larger upper end. The angle between the sidewall of the positioning boss 51 and the axis of the hot nozzle is greater than or equal to 3 degrees and less than or equal to 8 degrees. The inner air passage I 50 and the upper hot nozzle mounting hole penetrate the end face of the positioning boss 51. Simultaneously, a positioning groove 6a is provided on the top surface of the lower body 6. The positioning groove 6a has the same shape and size as the positioning boss 51, which can just accommodate the insertion of the positioning boss 51, thereby achieving axial positioning. The inner air passage II 60 and the lower hot nozzle mounting hole are provided with... The positioning boss 51 is placed in the positioning groove 6a. At the same time, a positioning component is provided between the outer wall of the positioning boss 51 and the inner wall of the positioning groove 6a. The positioning component is used for radial positioning between the upper and lower seats. The positioning component includes a limiting groove 53 provided on the side wall of the positioning boss 51 and a limiting protrusion 63 provided on the inner wall of the positioning groove 6a and corresponding to the limiting groove. Through the above structure, the two can be quickly radially positioned, so that the air passage can be quickly connected and misalignment can be avoided. In order to improve air tightness, an annular groove is provided on the end face of the positioning boss 51. The annular groove is coaxial with the air passage 50Ⅰ and is used to install the sealing ring, forming the sealing ring installation groove 52.

[0041] In this application, the upper mold includes an upper mold base plate, an upper mold frame, and an upper mold core 3, and the upper mold base plate, upper mold frame, and upper mold core 3 are arranged sequentially from top to bottom. The upper seat 5 is located inside the upper mold frame, and the lower seat 6 is located inside the upper mold core 3. It is easy to manufacture and process, has low cost, and can achieve precise and fast assembly. Its whole body is set inside, with high pressure resistance and good performance.

[0042] The following describes the check valve in this application:

[0043] See Figure 8 The one-way valve 7 includes a valve body, which is cylindrical and can be interference-fitted into the air inlet. A valve cavity 720 is formed within the valve body, with the upper end serving as the air inlet and the lower end as the air outlet. A valve stem 73 is provided within the valve cavity 720, coaxial with the valve cavity and slidingly fitted within it. A first sealing surface 734, smaller at the upper end and larger at the lower end, is provided at the lower end of the valve stem 73. This first sealing surface 734 has a conical structure. Meanwhile, within the valve cavity 720… The end of the valve stem 73 is provided with a second sealing surface, which is also conical and has the same inclination angle as the first sealing surface. It can fit with the first sealing surface to achieve a seal. An elastic component, which is a compression spring, is provided in the valve cavity 720. The elastic component causes the valve stem 73 to have an upward movement tendency so that the first sealing surface fits with the second sealing surface, thereby blocking the air passage and achieving a seal. When the valve stem 73 is in the upper limit position, the end of the valve stem 73 is flush with the bottom surface of the valve body.

[0044] Specifically, a recessed hole is provided on the top of the valve body. This recessed hole is a blind hole, forming an air inlet 710. A central hole and an air inlet are provided on the bottom surface of the air inlet 710, which communicate with the valve cavity. The axis of the central hole is coaxial with the valve body. There are multiple air inlets, which are evenly distributed around the central hole. The top surface of the valve cavity is a plane. At the same time, a valve core 74 is provided on the valve stem. The top surface of the valve core 74 is a plane, which serves as a third sealing surface. A rubber layer 75 is provided on the third sealing surface to form a buffer and seal, which can adhere to the surface of the valve. The valve core (with valve stem) is positioned at the top of the valve cavity, thus blocking the air inlet from connecting to the valve cavity. High-pressure nitrogen gas can pass through the air inlet and push the valve core (with valve stem) downward, causing the third sealing surface to separate from the top surface of the valve cavity, forming an air inlet gap. Simultaneously, the first sealing surface at the lower end of the valve stem separates from the second sealing surface, forming an air outlet gap. In this application, a bolt body 731 is provided at the upper end of the valve stem 73. The valve core is cylindrical and threaded onto the bolt body. The center of the bolt body extends upward to form a guide rod 733. This guide rod 733 connects to the valve... The rod 73 is coaxial, and the guide rod passes through the central hole and extends into the air inlet 710. A limiting bolt 76 is provided at the end of the guide rod 733. The head diameter of the limiting bolt is larger than the diameter of the guide rod, which serves to limit the axial movement. The diameters of the guide rod, bolt body, and valve rod increase sequentially, and the diameter of the valve core is larger than the diameter of the valve rod. Therefore, the valve core has a downward stepped surface. At the same time, an upward stepped surface is provided in the valve cavity. The compression spring is provided between the two stepped surfaces, so that the valve rod has an upward movement tendency. When the valve rod is at the upper limit position, the first sealing surface is in contact with the second sealing surface, and the third sealing surface is in contact with the air inlet and blocks the air inlet. In this application, the valve body includes a first valve body 71 and a second valve body 72 coaxially arranged. The valve cavity passes through the upper and lower ends of the second valve body. The first valve body is located at the upper end of the first valve body and is welded together. The air inlet 710 is opened on the top of the first valve body 71. The bottom surface of the first valve body forms a sealing surface for contacting the top surface of the valve core to achieve sealing.

[0045] This utility model relates to a heat-resistant, lightweight, environmentally friendly, durable PLA coffee cup mold. An air inlet is provided on the side wall of the molding cavity, allowing high-pressure nitrogen to be injected during molding. This causes the molten material within the molding cavity to foam, uniformly filling the entire cavity and improving product quality while reducing weight. Furthermore, the degree of foaming can be controlled by adjusting the pressure of the high-pressure nitrogen to accommodate products of different specifications and densities. The multi-inlet structure increases air intake and foaming efficiency while reducing internal stress in the molten material, resulting in a more uniform and robust product. This structure also helps shorten the molding cycle and improve production efficiency. A positioning seat serves as the mounting carrier for the hot nozzle and air inlets, significantly reducing manufacturing difficulty and costs, improving product precision, facilitating assembly, and simplifying maintenance, while also reducing usage and maintenance costs. The positioning seat adopts a split structure, further reducing manufacturing costs and improving manufacturing precision, while also facilitating maintenance. This utility model of a heat-resistant, lightweight, environmentally friendly, durable PLA coffee cup mold features a compact structure, low manufacturing cost, and enables rapid and lightweight manufacturing of products with high production efficiency and good product quality.

[0046] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A heat-resistant, lightweight, environmentally friendly, durable PLA coffee cup mold, characterized in that: The device includes an upper mold core mounted on an upper mold and a lower mold core mounted on a lower mold. The lower end of the upper mold core has a first forming surface, and the upper end of the lower mold core has a second forming surface. The upper mold core can close with the lower mold core to form a forming cavity for inverting a cup body between the first forming surface and the second forming surface. The upper mold has a hot nozzle that communicates with the forming cavity and is used for material injection, and an air inlet for filling with nitrogen to foam the material in the forming cavity. The side wall of the upper mold has an air source interface for connecting to a nitrogen gas source. The air source interface is connected to the air inlet through an air passage. The air inlet has a one-way valve that allows nitrogen to enter the forming cavity in one direction. The end face of the one-way valve is flush with the first forming surface.

2. The heat-resistant, lightweight, environmentally friendly, durable PLA coffee cup mold as described in claim 1, characterized in that: The air inlets are at least two and are evenly distributed around the circumference of the heating nozzle.

3. The heat-resistant, lightweight, environmentally friendly, durable PLA coffee cup mold as described in claim 1, characterized in that: The heating nozzle and the air inlet are located at the top of the molding cavity.

4. The heat-resistant, lightweight, environmentally friendly, durable PLA coffee cup mold as described in claim 1, characterized in that: The thickness of the molding cavity is greater than or equal to 0.5 mm and less than or equal to 3 mm.

5. The heat-resistant, lightweight, environmentally friendly, durable PLA coffee cup mold as described in claim 1, characterized in that: The upper mold is provided with a positioning seat with a circular cross-section. The bottom surface of the positioning seat serves as the upper forming surface. The hot nozzle is installed on the positioning seat. The bottom surface of the positioning seat has a circular hole that forms the air inlet. The one-way valve is interference-fitted into the air inlet. The positioning seat has an internal air passage that communicates with the air inlet.

6. The heat-resistant, lightweight, environmentally friendly, durable PLA coffee cup mold as described in claim 1, characterized in that: The axis of the air inlet is parallel to the axis of the heating nozzle.

7. The heat-resistant, lightweight, environmentally friendly, durable PLA coffee cup mold as described in claim 5, characterized in that: The positioning seat includes an upper seat body and a lower seat body fixed to the lower end of the upper seat body by bolts. The upper seat body has an upper hot nozzle mounting hole through which a hot nozzle passes. The lower seat body has a lower hot nozzle mounting hole for inserting the end of the hot nozzle. The bottom surface of the lower hot nozzle mounting hole has an injection hole communicating with the molding cavity. The air inlet is located on the bottom surface of the lower seat body. The top surface of the lower seat body has an inner air passage II communicating with the air inlet. The upper seat body has an inner air passage I communicating with the inner air passage II. The inner air passage I communicates with the outer air passage in the upper mold.

8. The heat-resistant, lightweight, environmentally friendly, durable PLA coffee cup mold as described in claim 7, characterized in that: The lower end of the upper body is provided with a positioning boss, and the inner air passage I and the upper heating nozzle mounting hole pass through the end face of the positioning boss; the top surface of the lower body is provided with a positioning groove for inserting the positioning boss and achieving axial positioning, and the inner air passage II and the lower heating nozzle mounting hole are located in the positioning groove.

9. The heat-resistant, lightweight, environmentally friendly, durable PLA coffee cup mold as described in claim 8, characterized in that: A positioning component for radial positioning is provided between the side wall of the positioning boss and the inner wall of the positioning groove.

10. The heat-resistant, lightweight, environmentally friendly, durable PLA coffee cup mold as described in claim 7, characterized in that: The upper mold includes an upper mold base plate, an upper mold frame, and an upper mold core arranged sequentially from top to bottom. The upper seat body is located inside the upper mold frame, and the lower seat body is located inside the upper mold core.

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