Multicolor injection molding bottle cap forming equipment
By introducing a preheating component and a pre-stirring structure into the multi-color injection molding bottle cap equipment, the problems of uneven temperature caused by unpreheated plastic particles and raw material accumulation in the hopper were solved. This enabled efficient and uniform raw material melting and synchronous feeding, improving the molding quality and production efficiency of multi-color bottle caps.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU OUBAIBO PACKAGING TECH CO LTD
- Filing Date
- 2025-05-19
- Publication Date
- 2026-04-17
AI Technical Summary
Existing multi-color injection molding bottle cap equipment lacks an effective preheating device, resulting in plastic granules not being preheated in advance, long heating and melting time, poor temperature uniformity, and easy generation of weld lines and uneven color mixing. At the same time, the smooth inner wall of the hopper can easily cause high-viscosity raw materials to adhere and accumulate, affecting the uniformity of material feeding and the synchronization of feeding.
Employing a preheating component and a pre-stirring structure, the material status inside the hopper is monitored in real time by temperature and humidity sensors. The controller regulates the electric heating tube for preheating and drying. Combined with an isolation insulation structure and a stirring rod, the material is prevented from adhering, ensuring that the material reaches a uniform temperature and humidity before entering the conveying pipe. The pre-stirring structure turns the material over to prevent accumulation and improves feeding synchronization.
It shortens the production cycle, reduces energy consumption, ensures uniformity of injection molding temperature, reduces defects such as weld lines and uneven color, and improves the molding quality and production efficiency of bottle caps.
Smart Images
Figure CN224130308U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of injection molding equipment technology, and in particular to a multi-color injection molding bottle cap molding equipment. Background Technology
[0002] Multi-color injection molding bottle cap equipment refers to specialized equipment that uses two or more hoppers to transport plastic raw materials of different colors and then uses injection molds to produce bottle caps with two-color or multi-color appearances in one step. Its core principle is to use multi-channel co-extrusion technology to simultaneously inject different colored raw materials into the mold cavity to achieve color combination. This technology is widely used in beverage, cosmetics, pharmaceutical and other fields to meet the market's diverse needs for the aesthetics and functionality of bottle caps.
[0003] However, existing traditional multi-color injection molding bottle cap equipment uses multiple independent hoppers to transport raw materials of different colors. However, the hoppers have a single function, only having the functions of material storage and feeding, and lack an effective preheating device. PE, PP and other plastic granular raw materials are often directly fed into the conveying pipe through the hopper in a normal temperature or slightly moist state. During the screw conveying process, they are heated and melted by the heater. Then, they are injected into the mold in the injection molding chamber at the same time as other molten raw materials of different colors through the injection nozzle. After mold closing, pressure holding and other processes, they are formed into bottle caps. Because there is no preheating, the heating and melting of the raw materials takes a long time, which not only increases the production cycle, but also causes local raw materials to be underheated due to poor temperature uniformity. This can easily lead to problems such as weld lines and uneven color mixing, affecting the quality and appearance of the bottle caps. In addition, the inner wall of the traditional hopper is smooth and lacks a stirring device. High-viscosity raw materials are easy to adhere and accumulate, resulting in uneven feeding and affecting the synchronous feeding of multi-color raw materials.
[0004] To address this, a multi-color injection molding equipment for bottle caps is proposed. Utility Model Content
[0005] The purpose of this invention is to provide a multi-color injection molding bottle cap forming equipment that solves the problems of existing traditional multi-color injection molding bottle cap equipment that uses multiple independent hoppers to transport raw materials of different colors. However, the hoppers have only single functions, including material storage and feeding, and lack an effective preheating device. In this equipment, PE, PP and other plastic granular raw materials are often directly fed into the conveying pipe through the hopper at room temperature or slightly damp. During the screw conveying process, they are heated and melted by a heater. Then, they are injected into the mold in the injection molding chamber in sync with other molten raw materials of different colors through the injection nozzle. After mold closing, pressure holding and other processes, the materials are formed into bottle caps. Because there is no preheating, the heating and melting of the raw materials takes a long time, which not only increases the production cycle, but also causes local insufficient heating of raw materials due to poor temperature uniformity, which easily leads to weld lines, uneven color mixing and other problems, affecting the quality and appearance of the bottle caps. In addition, the smooth inner wall of the traditional hopper and the lack of a stirring device make it easy for high-viscosity raw materials to adhere and accumulate, resulting in uneven feeding and affecting the synchronous feeding of multi-color raw materials.
[0006] To achieve the above objectives, this utility model provides the following technical solution: a multi-color injection molding bottle cap forming equipment, comprising a bottle cap injection molding machine body, wherein a conveying pipe is provided on the front and rear sides of the top right side of the bottle cap injection molding machine body, a screw rod and a heater are respectively provided inside and outside the conveying pipe, a hopper is connected to the top of the conveying pipe, a controller is provided on the top of the bottle cap injection molding machine body, an injection molding chamber is provided on the left side of the top of the bottle cap injection molding machine body, a preheating component is provided on the outside of the hopper, and a pre-stirring structure is provided inside the hopper;
[0007] The preheating component includes a temperature sensor and a humidity sensor located on the left side of the hopper. The sensing ends of the temperature sensor and the humidity sensor are both located inside the hopper. The temperature sensor and the humidity sensor are both electrically connected to the controller. An electric heating tube is embedded on the outside of the hopper and is electrically connected to the controller. An insulation structure is provided on the outside of the hopper.
[0008] Preferably, the pre-mixing structure includes a bracket bolted to the right side of the top of the hopper, a motor bolted to the top of the bracket, the motor being electrically connected to a controller, and the output end of the motor passing through the top of the bracket.
[0009] Preferably, the output end of the motor is fixedly connected to a shaft, and the shaft is located inside the hopper.
[0010] Preferably, a stirring rod is fixedly connected to the outer side of the shaft, and a diversion port is opened on the outer side of the stirring rod.
[0011] Preferably, the insulation structure includes a first insulation sleeve and a second insulation sleeve fitted on the front and rear sides of the hopper, the inner sides of the first insulation sleeve and the second insulation sleeve are bonded to each other, and the first insulation sleeve and the second insulation sleeve are located on the outside of the electric heating tube.
[0012] Preferably, a reinforcing ring is provided on the outer side of the first and second insulation sleeves, and the reinforcing ring is made of metal material.
[0013] Preferably, the interior of the hopper is coated with an anti-stick coating made of polytetrafluoroethylene.
[0014] Preferably, the bottom of the shaft is provided with a spiral feeding blade, which is located on the bottom side inside the hopper.
[0015] Compared with the prior art, the beneficial effects of this utility model are:
[0016] 1. This application sets up a preheating component and uses humidity and temperature sensors to monitor the humidity and temperature of the injection molding raw material in the hopper in real time, and feeds the data back to the controller. The controller adjusts the heating temperature of the electric heating tube in real time according to the feedback to preheat or dry the raw material, so that the plastic particles reach the preset temperature range before entering the conveying pipe, shortening the melting time in the conveying pipe, reducing the production cycle and energy consumption, while ensuring the uniformity of injection molding temperature and reducing the risk of defects such as bubbles and degradation caused by moisture.
[0017] 2. By setting a pre-stirring structure, this application can agitate and mix the plastic raw materials in the hopper, avoiding the formation of dead material due to gravity accumulation or adhesion to the wall surface of high-viscosity raw materials, ensuring uniform feeding, improving the synchronization of multi-color hopper feeding, and thus reducing appearance defects such as weld lines and uneven color mixing caused by inconsistent melting state of raw materials, thereby improving the quality of bottle cap molding. Attached Figure Description
[0018] Figure 1 This is an overall structural diagram of the multi-color injection molding bottle cap forming equipment of this utility model;
[0019] Figure 2 This is a structural diagram of the hopper of this utility model;
[0020] Figure 3 This is a structural diagram of the preheating component of this utility model;
[0021] Figure 4 This is a structural diagram of the pre-stirring structure of this utility model;
[0022] Figure 5 This is a structural diagram of the insulation structure of this utility model.
[0023] In the diagram, 1. Bottle cap injection molding machine body; 2. Conveying pipe; 3. Hopper; 4. Controller; 5. Injection molding chamber; 6. Preheating assembly; 61. Temperature sensor; 62. Humidity sensor; 63. Electric heating element; 64. Insulation structure; 641. First insulation sleeve; 642. Second insulation sleeve; 643. Reinforcing ring; 7. Pre-stirring structure; 71. Support; 72. Motor; 73. Shaft; 74. Stirring rod; 8. Anti-stick coating; 9. Spiral feeding blades. Detailed Implementation
[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0025] Please see Figure 1-5 The present invention provides the following technical solution:
[0026] A multi-color injection molding bottle cap forming equipment includes a bottle cap injection molding machine body 1. A conveying pipe 2 is provided on the front and rear sides of the top right side of the bottle cap injection molding machine body 1. A screw rod and a heater are respectively provided inside and outside the conveying pipe 2. A hopper 3 is connected to the top of the conveying pipe 2. A controller 4 is provided on the top of the bottle cap injection molding machine body 1. An injection molding chamber 5 is provided on the left side of the top of the bottle cap injection molding machine body 1. A preheating component 6 is provided on the outside of the hopper 3. A pre-stirring structure 7 is provided inside the hopper 3.
[0027] The heating assembly includes a temperature sensor 61 and a humidity sensor 62 located on the left side of the hopper 3. The sensing ends of the temperature sensor 61 and the humidity sensor 62 are both located inside the hopper 3. The temperature sensor 61 and the humidity sensor 62 are both electrically connected to the controller 4. An electric heating tube 63 is embedded in the outer side of the hopper 3. The electric heating tube 63 is electrically connected to the controller 4. An insulation structure 64 is provided on the outer side of the hopper 3.
[0028] In this embodiment: by setting up a preheating component 6 and a pre-stirring structure 7, after the plastic granules are fed into the hopper 3, the temperature sensor 61 and humidity sensor 62 continuously detect the temperature and humidity of the raw materials in the hopper 3 and transmit the data to the controller 4. If the raw material temperature is lower than the preset value, the controller 4 automatically activates the electric heating tube 63 to preheat the raw materials through the electric heating tube 63 on the outside of the hopper 3. At the same time, the insulation structure 64 reduces heat loss, so that the raw materials reach a uniform preheating temperature before entering the conveying pipe 2. If the raw material humidity is detected to be excessive, the controller 4 controls the electric heating tube 63 to operate in low-temperature mode to perform drying pretreatment on the raw materials and reduce the moisture content. At the same time, the pre-stirring structure 7 agitates and stirs the raw materials in the hopper 3, so that high-viscosity raw materials cannot accumulate or adhere due to gravity. The hopper 3 wall ensures that the raw materials remain loose and uniform at all times. During the mixing process, the preheated raw materials enter the conveying pipe 2 through the bottom of the hopper 3. Inside the conveying pipe 2, the shearing force generated by the rotation of the screw and the conductive heat from the outer heater work together to further heat the preheated raw materials to a molten state. Since the raw materials have already undergone preliminary temperature equalization and humidity control in the hopper 3, their heating path in the conveying pipe 2 is shortened, the melting efficiency is significantly improved, and the temperature uniformity is guaranteed. Finally, molten raw materials of different colors are simultaneously injected into the mold of the injection molding chamber 5 through the injection nozzle. After mold closing, pressure holding, and other processes, due to sufficient preheating, controllable humidity, and uniform feeding, defects such as weld lines, uneven color, and bubbles are effectively reduced, achieving efficient and high-quality molding of multi-color bottle caps.
[0029] Specifically, such as Figure 4As shown, the pre-mixing structure 7 includes a bracket 71 bolted to the right side of the top of the hopper 3. A motor 72 is bolted to the top of the bracket 71. The motor 72 is electrically connected to the controller 4. The output end of the motor 72 passes through the top of the bracket 71.
[0030] Specifically, such as Figure 4 As shown, the output end of the motor 72 is fixedly connected to a shaft 73, which is located inside the hopper 3.
[0031] Specifically, such as Figure 4 As shown, a stirring rod 74 is fixedly connected to the outer side of the shaft 73, and a flow divider is provided on the outer side of the stirring rod 74.
[0032] In this embodiment: by setting a pre-stirring structure 7, the motor 72 is fixed to the top of the hopper 3 by the bracket 71. After being powered on, the drive shaft 73 rotates, which drives the outer stirring rod 74 to tumble the raw materials in the hopper 3. The diversion port on the stirring rod 74 can cut the raw material accumulation layer when rotating, so that the material diffuses to the periphery of the hopper 3 under the action of centrifugal force. At the same time, a local vortex is formed through the diversion port to avoid high viscosity raw materials from adhering to the wall or compacting and agglomerating, ensuring continuous and stable feeding of the hopper 3, improving the feeding synchronization of the multi-color hopper 3, and reducing the difference in melting state and molding defects caused by uneven feeding.
[0033] Specifically, such as Figure 5 As shown, the insulation structure 64 includes a first insulation sleeve 641 and a second insulation sleeve 642 sleeved on the front and rear sides of the hopper 3. The inner sides of the first insulation sleeve 641 and the second insulation sleeve 642 are bonded to each other, and the first insulation sleeve 641 and the second insulation sleeve 642 are located on the outside of the electric heating tube 63.
[0034] Specifically, such as Figure 5 As shown, a reinforcing ring 643 is provided on the outer side of the first insulation sleeve 641 and the second insulation sleeve 642. The reinforcing ring 643 is made of metal material.
[0035] In this embodiment: by setting an isolation and heat preservation structure 64, the first heat preservation sleeve 641 and the second heat preservation sleeve 642 are wrapped around the front and rear sides of the hopper 3, and the inner side is bonded to form a complete heat preservation layer, which is tightly attached to the outside of the electric heating tube 63. The first heat preservation sleeve 641 and the second heat preservation sleeve 642 are made of polyurethane or ceramic fiber heat preservation material, which can effectively block heat loss to the outside, so that the heat generated by the electric heating tube 63 is concentrated on the raw materials inside the hopper 3, reducing energy loss. The outer metal reinforcing ring 643 enhances the stability of the first heat preservation sleeve 641 and the second heat preservation sleeve 642 on the outside of the hopper 3, and prevents the first heat preservation sleeve 641 and the second heat preservation sleeve 642 from falling off due to vibration of the hopper 3 or external collision, thus ensuring the stability and continuity of the preheating process.
[0036] Specifically, such as Figure 4 As shown, the inside of the hopper 3 is coated with an anti-stick coating 8, which is made of polytetrafluoroethylene.
[0037] Specifically, such as Figure 4 As shown, a spiral feeding blade 9 is provided at the bottom of the shaft 73, and the spiral feeding blade 9 is located on the bottom side inside the hopper 3.
[0038] In this embodiment: by coating the inner wall of the hopper 3 with a non-stick coating 8 of polytetrafluoroethylene material, the low surface energy of the coating makes it difficult for raw material particles to adhere. Combined with the agitation of the stirring rod 74, the dead corners of raw material accumulation can be completely eliminated. The spiral feeding blades 9 generate a downward axial thrust when rotating, pushing the raw material to the bottom outlet of the hopper 3 in a timely manner. At the same time, the spiral curved surface of the spiral feeding blades 9 guides the raw material to form a uniform flow layer at the bottom of the hopper 3, further avoiding raw material degradation or feeding pulse fluctuations caused by stagnation. This ensures that the preheated raw material enters the conveying pipe 2 at a stable flow rate, laying the foundation for subsequent melting uniformity and multi-color co-extrusion accuracy.
[0039] Working Principle: In the multi-color injection molding bottle cap forming equipment, firstly, after the plastic granules are fed into the hopper 3, the temperature sensor 61 and humidity sensor 62 monitor the temperature and humidity of the raw materials in the hopper 3 in real time and feed the data back to the controller 4. If the temperature is insufficient, the controller 4 activates the electric heating tube 63 to preheat the raw materials. At the same time, the insulation structure 64, composed of the first insulation sleeve 641 and the second insulation sleeve 642, reduces heat loss. If the humidity exceeds the standard, the low-temperature drying mode is activated. Simultaneously, the motor 72 drives the shaft 73 to rotate, which in turn drives the stirring rod 74 to agitate the raw materials. The flow outlet cuts through the accumulated layers and forms a vortex. Combined with the PTFE anti-stick coating 8 on the inner wall of hopper 3, this prevents the raw material from adhering or compacting. The spiral feeding blades 9 at the bottom of the shaft 73 spirally push the evenly mixed raw material to the bottom of hopper 3, and then into the conveying pipe 2. In the conveying pipe 2, the shearing force of the rotating spiral and the conductive heat from the outer heater work together to further heat the preheated raw material to a molten state. Because the raw material has already undergone temperature equalization, humidity control, and uniform mixing in hopper 3, it heats up faster and more uniformly in the conveying pipe 2, ultimately resulting in molten raw materials of different colors. The material is simultaneously injected into the mold of the injection molding chamber 5 through the injection nozzle. After processes such as mold closing and pressure holding, multi-color bottle caps are efficiently molded, effectively reducing defects such as weld lines, uneven color, and bubbles. The entire device, through intelligent linkage with controller 4, organically combines preheating, stirring, detection, and heating, optimizing injection molding process parameters from the raw material pretreatment stage, and systematically improving the production efficiency and product stability of multi-color injection molded bottle caps. It should be noted that the detection accuracy of humidity sensor 62 can reach ±0.05%, and its threshold setting refers to GB / T2951.12-2021. Industry standards such as "Plastics Polyethylene (PE) Molding and Extrusion Materials Part 12: Sample Preparation and Performance Determination" set the moisture content threshold for PE materials at 0.1%. In the drying mode, the power adjustment range of the electric heating tube 63 is 60-80℃. When the humidity sensor detects a value > 0.1%, the controller triggers the electric heating tube to heat at a constant temperature of 70℃. At the same time, the stirring rod 74 is controlled to continuously stir at a low speed of 10r / min for 30 minutes. The low-speed stirring ensures that the raw materials are heated evenly, ensuring that the raw materials are turned and mixed during the drying process, avoiding local moisture residue, and improving drying efficiency and uniformity.
[0040] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A multi-color injection molded bottle cap molding apparatus comprising a bottle cap injection molding machine main body (1), characterized by: The bottle cap injection molding machine body (1) is provided with a conveying pipe (2) on the front and rear sides of the top right side. The conveying pipe (2) is provided with a screw rod and a heater on the inside and outside respectively. The top of the conveying pipe (2) is connected to a hopper (3). The top of the bottle cap injection molding machine body (1) is provided with a controller (4). The left side of the top of the bottle cap injection molding machine body (1) is provided with an injection molding chamber (5). The outside of the hopper (3) is provided with a preheating component (6). The inside of the hopper (3) is provided with a pre-stirring structure (7). The preheating component (6) includes a temperature sensor (61) and a humidity sensor (62) located on the left side of the hopper (3). The sensing ends of the temperature sensor (61) and the humidity sensor (62) are both located inside the hopper (3). The temperature sensor (61) and the humidity sensor (62) are both electrically connected to the controller (4). An electric heating tube (63) is embedded in the outer side of the hopper (3). The electric heating tube (63) is electrically connected to the controller (4). An insulation structure (64) is provided on the outer side of the hopper (3).
2. A multi-color injection molded bottle cap forming apparatus according to claim 1, wherein: The pre-mixing structure (7) includes a bracket (71) bolted to the right side of the top of the hopper (3). A motor (72) is bolted to the top of the bracket (71). The motor (72) is electrically connected to the controller (4). The output end of the motor (72) passes through the top of the bracket (71).
3. A multi-color injection molded bottle cap forming apparatus according to claim 2, wherein: The output end of the motor (72) is fixedly connected to a shaft (73), which is located inside the hopper (3).
4. A multi-color injection molded bottle cap forming apparatus according to claim 3, wherein: A stirring rod (74) is fixedly connected to the outside of the shaft (73), and a flow divider is provided on the outside of the stirring rod (74).
5. A multi-color injection molded bottle cap forming apparatus according to claim 1, wherein: The insulation structure (64) includes a first insulation sleeve (641) and a second insulation sleeve (642) sleeved on the front and rear sides of the hopper (3). The inner sides of the first insulation sleeve (641) and the second insulation sleeve (642) are bonded to each other. The first insulation sleeve (641) and the second insulation sleeve (642) are located on the outside of the electric heating tube (63).
6. A multi-color injection molded bottle cap forming apparatus according to claim 5, wherein: The first insulation sleeve (641) and the second insulation sleeve (642) are provided with a reinforcing ring (643) on their outer sides, and the reinforcing ring (643) is made of metal material.
7. The multi-color injection molding bottle cap forming equipment according to claim 1, characterized in that: The inside of the hopper (3) is coated with an anti-stick coating (8), which is made of polytetrafluoroethylene material.
8. The multi-color injection molding bottle cap forming equipment according to claim 3, characterized in that: The bottom of the shaft (73) is provided with a spiral feeding blade (9), which is located on the bottom side inside the hopper (3).