Plastic product forming device

Abstract

The utility model discloses a plastic product forming device, which is applied to the technical field of plastic product forming and comprises an extrusion mechanism with an extrusion die head, a filling mechanism with a filling needle, a clamp mechanism and a forming die with a head die and a main die. The filling needle is provided with a gas channel and is connected into the supporting channels, a circular seam is formed between the supporting channels and the outer wall of the filling needle, the supporting channels are communicated through transverse channels, the transverse channels are connected with a total gas inlet channel, and a gas inlet of the total gas inlet channel is connected with a sterile gas source. According to the plastic product forming device, the main mold vacuum suction technology and the filling needle blowing technology are combined, and the production requirement for full forming of special bottle types and large-volume bottle types is met.

Description

Technical Field

[0001] This utility model relates to the field of plastic product molding technology, and in particular to a plastic product molding device. Background Technology

[0002] BFS (Blow-Fill-Seal) equipment refers to equipment that uses an extruder screw to heat and fuse plastic preforms, then molds and fills them in a mold, and finally seals them using the residual heat of the preform. All of the above processes—bottle making, filling, and sealing—can be completed in one machine.

[0003] BFS (Breakfast From Slot) equipment includes continuous BFS and reciprocating BFS. Continuous BFS means that during normal operation, the parison is not cut by the hot cutter; the entire process is continuous extrusion, and the filling needle is inside the parison. Reciprocating BFS means that during normal operation, the parison is cut by the hot cutter. It is cut once every time the parison length reaches a cycle length, and the filling needle and parison are usually located at two different stations.

[0004] Currently, container forming utilizes continuous BFS (Browser-First-Flight) equipment, employing a continuous forming process where the product is formed using a mold vacuum adsorption forming principle. The container forming process involves a head mold fixture and a main mold fixture; the container is formed under vacuum through the main mold and head mold. Existing technology uses a three-layer filling needle structure, featuring a liquid channel and a cooling channel, but lacking a gas channel, thus failing to achieve blowing and venting functions. Vacuum forming processes are mostly used for forming small-capacity, small-diameter bottles; for plastic products larger than 20ml, the forming effect is usually poor or impossible. This severely limits the capacity of containers produced by continuous equipment, making it unsuitable for producing large-capacity, large-diameter, or special bottle shapes.

[0005] In the existing technology, the molding process of products with a volume greater than 30ml is usually carried out using reciprocating BFS equipment. This type of equipment has the characteristics of low production capacity, poor aseptic safety and high waste rate, which seriously restricts the application of BFS technology in the industry.

[0006] In summary, how to effectively solve the problem that continuous BFS equipment cannot meet the production requirements of full forming of special bottle shapes and large-capacity bottles is an urgent problem that needs to be solved by those skilled in the art. Utility Model Content

[0007] The purpose of this invention is to provide a plastic product molding device that combines vacuum suction from the main mold and air blowing technology from the filling needle to meet the production needs of full molding of special bottle shapes and large-capacity bottle shapes.

[0008] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0009] A plastic product molding apparatus includes an extrusion mechanism with an extrusion die, a filling mechanism with a filling needle, a clamping mechanism, and a molding die with a head die and a main die. The extrusion die has a support channel, the filling needle has a gas channel and is connected to the support channel, and an annular seam is formed between the support channel and the outer wall of the filling needle. Multiple support channels are connected to each other through transverse channels, and a main air inlet channel is connected to the transverse channels. The air inlet of the main air inlet channel is connected to a sterile gas source.

[0010] Optionally, each of the support channels is provided with an air inlet location for controlling the ventilation volume, the control mechanism comprising:

[0011] A flow detection unit for detecting the air intake at the air inlet of each of the support channels;

[0012] A control valve connected to the flow detection unit for controlling the air intake volume of all the support channels to be equal.

[0013] Optionally, one end of the transverse channel is connected to the main air inlet channel, and the inner diameter of the transverse channel is not less than the outer diameter of the annular seam.

[0014] Optionally, the filling needle includes a filling tube, an inner tube, a middle tube, and an outer tube that are sequentially connected from the inside to the outside. A liquid inlet channel is formed inside the filling tube. Three annular channels are formed between the filling tube and the inner tube, between the inner tube and the middle tube, and between the middle tube and the outer tube. The annular channels include a gas channel, a cooling water inlet channel, and a cooling water return channel. The outlet of the cooling water inlet channel is connected to the inlet of the cooling water return channel.

[0015] Optionally, a gas passage is formed between the filling pipe and the inner pipe, a cooling water inlet passage is formed between the inner pipe and the middle pipe, and a cooling water return passage is formed between the middle pipe and the outer pipe;

[0016] Alternatively, a cooling water inlet channel may be formed between the filling pipe and the inner pipe, a cooling water return channel may be formed between the inner pipe and the middle pipe, and a gas channel may be formed between the middle pipe and the outer pipe.

[0017] Optionally, the pipe wall between the cooling water inlet channel and the cooling water return channel is provided with multiple connecting holes.

[0018] Optionally, the liquid outlet of the liquid inlet channel and the gas outlet of the gas channel are located at the lower end of the filling needle, the gas outlet of the gas channel is located at the lower edge of the mold opening of the main mold, and the liquid outlet of the liquid inlet channel is lower than the gas outlet of the gas channel.

[0019] Optionally, the liquid inlet of the liquid inlet channel is located on the top surface of the filling needle, and the gas inlet of the gas channel, the water inlet of the cooling water inlet channel, and the water return outlet of the cooling water return channel are located on the side wall of the filling needle.

[0020] Optionally, the sidewall of the filling needle has a tapered slope at its lower end, and when the filling needle is inserted into the blank, the slope of the filling needle intersects and contacts the mold opening of the main mold.

[0021] Optionally, the lower ends of the cooling water inlet channel and the cooling water return channel have openings, and the filling needle further includes plugs for sealing the lower openings of the cooling water inlet channel and the cooling water return channel.

[0022] The beneficial effect of this utility model is that the plastic product molding device provided by this utility model includes a gas channel in the filling needle and an air outlet located on the bottom surface of the filling needle. During the plastic product molding process, high-pressure gas is blown into the preform through the gas channel, so that the preform bubble and the mold cavity are completely fitted together to form a full bottle body, which helps the plastic product to be better molded in the mold.

[0023] The molding die consists of a head die and a main die, which together form the mold cavity for the plastic product. During the molding process, when the preform extruded from the extrusion die reaches the closing position of the main die, the main die closes, pressing the preform at the corresponding position. Simultaneously, the vacuum lines of the molding die are connected to vacuum gas, which draws the preform bubble towards the mold cavity. At the same time, the lower end of the filling needle engages with the cavity, and high-pressure blow molding gas is introduced through the filling needle's gas channel. This high-pressure gas exerts an outward force on the preform, causing the preform bubble to completely adhere to the main mold cavity, thus forming a full-bodied plastic product.

[0024] After molding is complete, the gas channel of the filling needle opens, allowing the high-pressure gas inside the plastic product to be expelled. Once expulsion is complete, the liquid inlet channel of the filling needle connects, injecting the liquid into the plastic product, thus completing the filling process. After filling, the filling needle moves upward, the mold head closes, and the plastic product is sealed.

[0025] An annular seam is formed between the support channels and the outer wall of the filling needle. Multiple support channels are connected by transverse channels, which are connected to a main air inlet channel. The air inlet of the main air inlet channel is connected to a sterile gas source. Sterile gas is introduced into the support channels and ejected from the upper end of the annular seam. The sterile gas forms a sterile chamber above the filling needle, which encloses the upper part of the filling needle, effectively isolating it from external contamination and achieving sterile protection for the filling needle. Simultaneously, the sterile gas moves downward along the annular seam into the preform, forming a positive pressure support within the preform. This effectively supports the hollow bubble, preventing it from collapsing and ensuring the stability of the preform's shape.

[0026] The plastic product molding device provided by this utility model has a filling needle that can be used for both inflatable blow molding and degassing filling. It can not only blow air into the preform to form a full bottle body, so that the bubble can fit completely with the main mold bottle cavity; it can also expel the gas in the container before filling, balance the pressure difference inside and outside the container, and ensure smooth filling of the medicine.

[0027] When producing large-capacity (e.g., containers larger than 20ml) or special bottle shapes, the molding die vacuuming and filling needle blowing are carried out simultaneously to ensure that the preform fits tightly into the mold cavity, meeting the molding requirements of special bottle shapes and large-capacity bottle shapes, realizing diversified production needs, and providing reliable technical support for the widespread application of continuous BFS equipment. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of a plastic product molding device provided in a specific embodiment of the present invention.

[0030] Figure 2 Another view of the plastic product molding apparatus;

[0031] Figure 3 for Figure 1 Enlarged view of the filling needle.

[0032] Figure label:

[0033] 1-Extrusion mechanism; 101-Preform; 102-Support channel; 103-Circumferential seam; 2-Filling needle; 201-Gas channel; 202-Liquid inlet channel; 203-Cooling water inlet channel; 204-Cooling water return channel; 205-Filling pipe; 206-Inner tube; 207-Middle tube; 208-Outer tube; 209-Plug; 3-Clamping mechanism; 4-Forming mold; 401-Head mold; 402-Main mold. Detailed Implementation

[0034] The core of this utility model is to provide a plastic product molding device that combines main mold vacuum suction and filling needle air blowing technology to meet the production needs of full molding of special bottle shapes and large-capacity bottle shapes.

[0035] 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.

[0036] Please refer to Figures 1 to 3 , Figure 1 This is a schematic diagram of the structure of a plastic product molding device provided in a specific embodiment of the present invention. Figure 2 Another view of the plastic product molding apparatus; Figure 3 for Figure 1 Enlarged view of the filling needle.

[0037] In one specific embodiment, the plastic product molding apparatus provided by this utility model includes an extrusion mechanism 1 with an extrusion die head, a filling mechanism with a filling needle 2, a clamping mechanism 3, and a molding die 4 with a head die 401 and a main die 402. The extrusion die head is provided with a support channel 102. The filling needle 2 has a gas channel 201 and is connected to the support channel 102. An annular seam 103 is formed between the support channel 102 and the outer wall of the filling needle 2. Multiple support channels 102 are connected to each other through a transverse channel. A total air inlet channel is connected to the transverse channel. The air inlet of the total air inlet channel is connected to a sterile gas source.

[0038] In the above structure, the plastic product molding device achieves efficient molding and processing of plastic products through the coordinated work of the extrusion mechanism 1, the filling mechanism, the molding die 4 and the clamping mechanism 3.

[0039] The extrusion mechanism 1 includes an extrusion die, a hopper, and an extrusion screw. Plastic particles fall from the hopper into the screw channel and are melted and plasticized under the dual action of the heating system and the shearing force of the screw rotation. The molten plastic is then extruded into the extrusion die through the extrusion action of the screw. Finally, the molten plastic is extruded from the die gap of the extrusion die to form an elongated hollow hot melt preform 101.

[0040] The filling mechanism includes a filling needle 2 and a lifting mechanism that drives the filling needle 2 to move up and down. The extrusion die head is provided with a support channel 102, which is vertical and provides space for the installation and positioning of the filling needle 2. The filling needle 2 moves up and down along the support channel 102 to ensure that the filling needle 2 can be stably inserted into the preform 101 to realize the delivery of liquid and gas.

[0041] The filling needle 2 includes a gas channel 201, with the gas outlet located on the bottom surface of the filling needle 2. During the molding process of plastic products, high-pressure gas is blown into the preform 101 through the gas channel 201, so that the preform 101 film bubble is completely attached to the mold cavity to form a full bottle body, which helps the plastic products to be better molded in the mold.

[0042] The molding die 4 includes a head die 401 and a main die 402, which together form the mold cavity for the plastic product. During the molding process, when the preform 101 extruded from the extrusion die reaches the closing position of the main die 402, the main die 402 closes, pressing the preform 101 at the corresponding position on the main die 402. Simultaneously, the vacuum pipeline of the molding die 4 is connected to vacuum gas, which adsorbs the preform 101 bubble and adheres it to the mold cavity. At the same time, the lower end of the filling needle 2 connects to the cavity, and the gas channel 201 of the filling needle 2 introduces high-pressure blow molding gas. The high-pressure gas applies an outward force to the preform 101, causing the preform 101 bubble to completely adhere to the cavity of the main die 402, thereby forming a full-bodied plastic product.

[0043] After molding, the gas channel 201 of the filling needle 2 opens, and the high-pressure gas inside the plastic product begins to exhaust through the gas channel 201. After exhausting, the liquid inlet channel 202 of the filling needle 2 connects, injecting the liquid into the plastic product to achieve filling. After filling, the filling needle 2 moves upward, and the head mold 401 closes, sealing the plastic product. It should be noted that during the blowing process, the gas channel 201 is a blowing channel, and during the exhaust process, the gas channel 201 is an exhaust channel; the inlet and outlet are interchanged during these processes.

[0044] A ring seam 103 is formed between the support channel 102 and the outer wall of the filling needle 2. Multiple support channels 102 are connected by a transverse channel, and a main air inlet channel is connected to the transverse channel. The air inlet of the main air inlet channel is connected to a sterile gas source. Multiple support channels 102 are connected by a transverse channel, and a single air source supplies air, resulting in a simple structure.

[0045] Sterile gas (such as sterile filtered compressed air) is introduced into the support channel 102. The sterile gas is ejected from the upper end of the annular seam 103. The sterile gas forms a sterile chamber above the filling needle 2 that extends beyond the support channel 102. The sterile chamber covers the upper part of the filling needle 2, effectively isolating it from external contamination and achieving sterile protection for the filling needle 2.

[0046] At the same time, sterile gas moves downward along the annular seam 103 into the preform 101, forming a positive pressure support inside the preform 101, effectively supporting the hollow membrane bubble, preventing the hollow membrane bubble from collapsing, and ensuring the shape stability of the preform 101.

[0047] The clamping mechanism 3 includes an upper clamp and a lower clamp. The upper clamp is located on the top surface of the head mold 401, and the lower clamp is initially located on the bottom surface of the main mold 402, avoiding the mold closing position. During the molding process, the clamping mechanism 3 is used to fix the preform 101 or the product chain, ensuring that the preform 101 and the product chain can maintain a stable position during molding and punching processes, and avoiding a decrease in molding quality due to movement or vibration.

[0048] In practical applications, the plastic product molding method integrates preform 101 molding, blow molding, filling, and sealing into a continuous production process. The process of molding plastic products is as follows:

[0049] Parison 101 Extrusion: The extrusion die extrudes the hot-melt hollow parison 101, which continues to be extruded until the appropriate length is reached. During the parison 101 extrusion process, it should be ensured that the parison 101 has sufficient length and uniform wall thickness to provide a foundation for subsequent molding and filling.

[0050] Initial sealing of preform 101: The lower clamp closes the mold to seal the hot-melt preform 101 and pulls it downwards, repeating this process 1-3 times. Through sealing and pulling operations, the preform 101 remains stable during subsequent molding. During the downward movement of the hot-melt preform 101, supporting gas inside ensures that the preform 101 maintains its shape during blow molding.

[0051] Empty bottle forming: When the hot-melted preform 101 moves down to the closing position of the main mold 402, the main mold 402 closes, pressing the preform 101 at the corresponding position of the main mold 402. At the same time as pressing, the vacuum pipeline of the forming mold 4 is connected to vacuum gas, and the vacuum gas adsorbs the preform 101 membrane bubble and adheres it to the mold cavity.

[0052] Simultaneously, the filling needle 2 moves downward, and its lower end fits and connects with the cavity to achieve a sealed connection, preventing gas leakage and ensuring high pressure and sterility during the molding process. High-pressure gas is introduced into the gas channel 201 of the filling needle 2. The high-pressure gas exerts an outward force on the preform 101, causing the preform 101 bubble to fit completely with the cavity of the main mold 402, thereby forming a full-bodied plastic product.

[0053] In empty bottle molding, the membrane bubble is tightly fitted to the mold cavity by the dual action of vacuum and high-pressure gas to form the desired bottle shape, resulting in high-quality plastic bottle molding.

[0054] Filling: Gas channel 201 opens to release high-pressure gas from inside the bottle, maintaining internal and external pressure balance. Liquid medicine enters the plastic product through inlet channel 202, completing the filling process. Filling is complete when the filling level is reached.

[0055] The filling liquid level can be controlled by setting a flow detection mechanism, such as a flow meter, in the liquid inlet channel 202 of the filling needle 2, thereby precisely controlling the consistency and accuracy of the liquid.

[0056] Sealing: After filling is completed, the filling needle 2 rises. When the filling needle 2 leaves the head mold 401, the head mold 401 seals the plastic product. The sealing of the plastic product by the head mold 401 ensures the sealing and stability of the plastic product and prevents leakage of the liquid and external contamination.

[0057] Mold Opening: After sealing, the upper and lower clamps simultaneously hold the product chain. The upper clamp is held on top of the head mold 401, while the lower clamp rises to the main mold 402 and holds the plastic product from below. The molding mold 4 opens, and the upper clamp opens as well. Through the coordinated action of the upper and lower clamps, the molded plastic bottle can be smoothly ejected from the molding mold 4, preparing for subsequent punching and conveying.

[0058] Repeating the steps of empty bottle forming, filling, sealing, and mold opening can realize the forming, filling, and sealing process of large-capacity plastic products.

[0059] In the above embodiments, the BFS process integrates preform 101 forming, blow molding, filling, and sealing into a continuous production process, achieving a high degree of automation, reducing manual intervention, and improving production efficiency. During the forming process, the main mold 402 simultaneously draws vacuum and the filling needle 2 blows air, ensuring that the preform 101 fits tightly into the mold cavity, meeting the forming requirements of special bottle shapes and large-capacity bottles, satisfying diverse production needs, and providing reliable technical support for the widespread application of continuous BFS equipment. Before filling, the gas inside the plastic product is expelled, balancing the pressure difference inside and outside the container, ensuring smooth filling of the liquid medicine.

[0060] The plastic product molding device provided by this utility model has a filling needle 2 which has the functions of inflating blow molding and degassing filling. It can not only blow air into the preform 101 to form a full bottle body so that the film bubble fits completely with the bottle cavity of the main mold 402; it can also expel the gas in the container before filling, balance the pressure difference inside and outside the container, and ensure smooth filling of the medicine.

[0061] When producing large-capacity (such as containers larger than 20ml) or special bottle shapes, the molding die 4 performs vacuum suction and the filling needle 2 blows air simultaneously to ensure that the preform 101 fits tightly into the mold cavity, meeting the molding requirements of special bottle shapes and large-capacity bottle shapes, realizing diversified production needs, and providing reliable technical support for the widespread application of continuous BFS equipment.

[0062] Based on the above specific embodiments, each support channel 102 is provided with a control mechanism for controlling the ventilation volume at its air inlet position. The control mechanism includes:

[0063] A flow detection unit for detecting the air intake at the air inlet of each support channel 102;

[0064] A control valve connected to the flow detection unit for controlling the air intake volume of all support channels 102 to be equal.

[0065] In one specific embodiment, each support channel 102 is provided with a control mechanism at its air inlet position to control the air volume. The control mechanism can precisely adjust the gas flow rate and pressure entering the support channel 102 to ensure that sterile gas can enter each support channel 102 evenly during the molding process, thereby ensuring the quality of the plastic product.

[0066] The start and end times of gas injection can be set via the control mechanism. For example, sterile gas can be started after a set time following equipment startup. Sterile gas can be introduced from the moment the equipment is turned on and continuously introduced during equipment operation to provide sterile protection for the filling needle 2.

[0067] Each support channel 102 has a detection channel at its air inlet, connected to a flow detection unit. The flow detection unit can be a high-precision gas flow sensor, which detects the gas flow rate in real time and converts the flow signal into an electrical signal, transmitting it to the control valve. The control valve can be a solenoid valve, capable of automatically adjusting its opening based on the signal feedback from the flow detection unit. When the flow detection unit detects that the air intake of a certain support channel 102 is inconsistent with the set value, the control valve automatically adjusts its opening to increase or decrease the air intake of that channel. Specifically, when the air intake of a certain support channel 102 is lower than the set value, the control valve automatically increases its opening to increase the air intake; when the air intake of a certain support channel 102 is higher than the set value, the control valve automatically decreases its opening to decrease the air intake, thereby ensuring that the air intake of all support channels 102 remains consistent, achieving uniform gas distribution.

[0068] In the above embodiment, the control mechanism can precisely control the air intake of each support channel 102 to ensure uniform gas distribution, thereby improving molding quality.

[0069] Based on the above specific embodiments, one end of the transverse channel is connected to the main air intake channel, and the inner diameter of the transverse channel is not less than the outer diameter of the circumferential seam 103.

[0070] In one specific embodiment, the transverse channel can be connected to the main air inlet channel at one end, resulting in a simple structure; alternatively, it can be connected to the main air inlet channel at both ends or even at multiple points, allowing for simultaneous air supply from multiple points. This ensures that each support channel 102 is close to the main air inlet channel, and that each support channel 102 receives a sufficient amount of gas in a short time, further guaranteeing uniform gas distribution across all support channels 102. Combined with gas flow control, precise control of the air intake volume in each support channel 102 can be achieved, ensuring that the air intake volume in each support channel 102 is equal, thereby improving the stability and consistency of molding quality.

[0071] The inner diameter of the transverse channel is not less than the outer diameter of the circumferential seam 103, ensuring that sufficient support gas can be provided for each support channel 102; at the same time, it can reduce the flow resistance of gas in the transverse channel, ensuring that gas can smoothly pass through the transverse channel to reach each support channel 102.

[0072] Based on the above specific embodiments, the filling needle 2 includes a filling tube 205, an inner tube 206, a middle tube 207, and an outer tube 208 that are sequentially connected from the inside to the outside. A liquid inlet channel 202 is formed inside the filling tube 205. Three annular channels are formed between the filling tube 205 and the inner tube 206, between the inner tube 206 and the middle tube 207, and between the middle tube 207 and the outer tube 208. The annular channels include a gas channel 201, a cooling water inlet channel 203, and a cooling water return channel 204. The outlet of the cooling water inlet channel 203 is connected to the inlet of the cooling water return channel 204.

[0073] In one specific embodiment, the filling needle 2 has a four-layer structure consisting of a filling tube 205, an inner tube 206, a middle tube 207, and an outer tube 208, forming a liquid inlet channel 202, a gas channel 201, a cooling water inlet channel 203, and a cooling water return channel 204.

[0074] The outlet of the liquid inlet channel 202 is located on the bottom surface of the filling needle 2, ensuring that the liquid can be accurately injected into the plastic product.

[0075] The gas channel 201 is located on the outer periphery of the liquid inlet channel 202, and its outlet is located on the bottom surface of the filling needle 2. During the molding process of plastic products, high-pressure gas is blown into the preform 101 through the gas channel 201, so that the preform 101 film bubble is completely attached to the mold cavity to form a full bottle body, which helps the plastic products to be better molded in the mold.

[0076] The cooling water channel includes an inlet cooling water channel 203 and a return cooling water channel 204, which are connected at the filling pin 2 to form a cooling circuit. The inlet cooling water channel 203 is used to transport cooling water to cool the molding process. The return cooling water channel 204 is used to return the cooled water, forming a cooling cycle. Cooling water enters through the inlet cooling water channel 203, flows out through the cooling circuit and then out through the return cooling water channel 204, carrying away heat and ensuring that the preform 101 cools and solidifies quickly and uniformly, avoiding bubbles and defects, and improving molding efficiency and product quality.

[0077] In the above structure, the four-layer structure of the filling needle 2 enables precise delivery of the liquid medicine, efficient molding of the bottle body, and rapid cooling during the molding process, which significantly improves molding efficiency and product quality.

[0078] The above content includes at least two schemes. In the first case, a gas passage 201 is formed between the filling pipe 205 and the inner pipe 206, a cooling water inlet passage 203 is formed between the inner pipe 206 and the middle pipe 207, and a cooling water return passage 204 is formed between the middle pipe 207 and the outer pipe 208.

[0079] In one specific embodiment, the filling needle 2 adopts a four-layer structure, consisting of a liquid inlet channel 202, a gas channel 201, a cooling water inlet channel 203, and a cooling water return channel 204, from the inside out. The thermal conductivity of gas is lower than that of liquid, and the heat transfer capacity of gas is lower than that of liquid. The gas channel 201, located between the liquid inlet channel 202 and the cooling water channel, reduces heat transfer from gas to liquid, thus preventing the liquid from being overheated before entering the mold cavity. The cooling water inlet channel 203 is closer to the liquid inlet channel 202, allowing the cooling water to be closer to the liquid, quickly removing heat and ensuring the liquid maintains an appropriate temperature when entering the mold cavity.

[0080] In the above embodiments, the thermal conductivity characteristics of gases and liquids are fully utilized, the thermal management of the molding process is optimized, and the molding efficiency and product quality are improved.

[0081] In the second scenario, a cooling water inlet channel 203 is formed between the filling pipe 205 and the inner pipe 206, a cooling water return channel 204 is formed between the inner pipe 206 and the middle pipe 207, and a gas channel 201 is formed between the middle pipe 207 and the outer pipe 208.

[0082] In one specific embodiment, the filling needle 2 adopts a four-layer structure, consisting of a liquid inlet channel 202, a cooling water inlet channel 203, a cooling water return channel 204, and a gas channel 201 from the inside out. The liquid inlet of the liquid inlet channel 202 is located on the top surface of the filling needle 2. The openings of the cooling water inlet channel 203, the cooling water return channel 204, and the gas channel 201 are located on the side wall of the filling needle 2 and are arranged in order from high to low. The liquid outlet of the liquid inlet channel 202 is lower than the liquid outlet of the gas channel 201.

[0083] In the above embodiments, the gas channel 201 is close to the mold cavity, and the high-pressure gas acts on the preform 101 at a shorter distance, which shortens the bonding time between the preform 101 bubble and the mold cavity and improves the molding efficiency of plastic products.

[0084] Based on the above specific embodiments, multiple connecting holes are provided on the pipe wall between the cooling water inlet channel 203 and the cooling water return channel 204.

[0085] In one specific embodiment, the presence of connecting holes allows cooling water to circulate between the cooling water inlet channel 203 and the cooling water return channel 204. When the cooling water inlet channel 203 is full, the cooling water can enter the cooling water return channel 204 from the multiple connecting holes between the inlet and return channels, breaking the single path of cooling water flow, enhancing the turbulence of the cooling water, and allowing the cooling water to be more evenly distributed in the cooling channel, thereby improving cooling efficiency.

[0086] The vertical and / or circumferential directions may include multiple connecting holes, allowing the cooling water inlet channel 203 and the cooling water return channel 204 to better adapt to cooling needs at different heights and locations. By rationally designing the distribution of the connecting holes, precise cooling of different areas can be achieved, improving the overall cooling effect.

[0087] In a preferred embodiment, the inlet cooling water channel 203 and the return cooling water channel 204 are connected at their lower ends to form a cooling circuit, that is, the connecting hole is located at the lowest end of the pipe wall between the inlet cooling water channel 203 and the return cooling water channel 204. Cooling water enters from the upper inlet of the inlet cooling water channel 203 and flows to the lower end of the inlet cooling water channel 203, enters the return cooling water channel 204 through the connecting hole at the lower end, and flows out from the return outlet of the return cooling water channel 204.

[0088] In the above embodiments, the flow path of cooling water in the channel is longer, which increases the residence time of cooling water in the system and is conducive to more complete heat absorption; to a certain extent, it balances the pressure of inlet and outlet water and reduces the uneven water flow caused by position differences.

[0089] Based on the above specific embodiments, the liquid outlet of the liquid inlet channel 202 and the gas outlet of the gas channel 201 are located at the lower end of the filling needle 2, the gas outlet of the gas channel 201 is located at the lower edge of the mold opening of the main mold 402, and the liquid outlet of the liquid inlet channel 202 is lower than the gas outlet of the gas channel 201.

[0090] In one specific embodiment, the liquid inlet of the liquid inlet channel 202 is located on the top surface of the filling needle 2, and the air inlet of the gas channel 201, the water inlet of the cooling water inlet channel 203, and the water return outlet of the cooling water return channel 204 are located on the side wall of the filling needle 2, which effectively utilizes space and reduces the impact on the main structure of the filling needle.

[0091] The liquid inlet channel 202 is located at the central axis and is used to precisely deliver the liquid to the mold cavity. The inlet of the liquid inlet channel 202 is located on the top surface of the filling needle 2, and the top surface has a conical annular groove. The liquid is injected vertically into the liquid inlet channel 202, reducing the flow resistance of the liquid. The outlet of the liquid inlet channel 202 is located on the bottom surface of the filling needle 2, and the outlet position is lower than the air outlet position of the gas channel 201, so that the liquid can flow more smoothly when entering the mold cavity.

[0092] Gas channel 201 is used for blow molding, ensuring that the preform 101 bubble completely fits the mold cavity to form a full bottle body. Gas channel 201 is an annular channel surrounding the liquid inlet channel 202. The air inlet is located on the upper side wall of the filling needle 2, and the air outlet is located on the bottom surface of the filling needle 2. The air outlet is positioned higher than the liquid outlet of the liquid inlet channel 202 and close to the mold opening of the mold cavity to prevent the liquid from flooding the air outlet and preventing the gas from being discharged. During the blowing process, the gas diffuses evenly along the mold cavity from the mold opening, ensuring that the preform 101 bubble can expand smoothly and completely fit the mold cavity.

[0093] The inlet of the cooling water inlet channel 203 is located on the side wall of the filling needle 2 and is lower than the air inlet of the gas channel 201. The return inlet of the cooling water return channel 204 is located on the side wall of the filling needle 2 and is lower than the inlet of the cooling water inlet channel 203. Preferably, without affecting the normal up-and-down movement of the filling needle 2, the return inlet of the cooling water return channel 204 is positioned as close to the lower end as possible, and the inlet of the cooling water inlet channel 203 is positioned as close to the upper edge as possible. This allows the cooling water to flow through the entire height of the filling needle 2 to the maximum extent, and allows the cooled hot water to be discharged through a shorter path, increasing the cooling range of the cooling water, reducing the heat conduction from the hot water to the cooling water, and maintaining efficient cooling.

[0094] Based on the above specific embodiments, the air inlet of the gas channel 201 and the water inlet of the cooling water channel 203 include a straight section and a conical section. The straight section is directly connected to the gas source channel or the water source channel. The lower annular opening of the straight section is connected to the large annular inlet of the conical section, and the small annular outlet of the conical section is connected to the upper annular opening of the vertical channel.

[0095] In one specific embodiment, the straight section directly connects to the gas source channel or water source channel, facilitating easy connection and ensuring smooth inflow of gas or cooling water. The lower annular opening of the straight section connects to the large annular inlet of the conical section, and the small annular outlet of the conical section connects to the upper annular opening of the vertical channel. The conical section guides the fluid smoothly to the vertical channels of the gas channel 201 and the cooling water inlet channel 203, reducing turbulence when the fluid enters the vertical channels; the smaller flow cross-section increases the pressure, ensuring uniform distribution and efficient delivery of gas or cooling water.

[0096] Based on the above specific embodiments, the sidewall of the filling needle 2 has a tapered slope at the lower end. When the filling needle 2 is inserted into the blank 101, the slope of the filling needle 2 intersects and contacts the mold opening of the main mold 402.

[0097] In one specific embodiment, the sidewall of the filling needle 2 has a tapered slope at its lower end, meaning the lower end of the filling needle 2 gradually tapers to form a conical contact surface. When the filling needle 2 is inserted into the mold cavity, the conical structure smoothly guides the filling needle 2 into the mold cavity, reducing resistance and friction during the insertion process.

[0098] During insertion, the lower inclined surface of the filling needle 2 intersects and contacts the mold opening of the mold cavity. The conical contact surface can better adapt to the shape of the mold cavity. The filling needle 2 and the mold opening form a tight sealing interface. The filling needle 2 and the mold cavity fit tightly together to ensure the sealing between the filling needle 2 and the mold cavity, preventing high-pressure gas from leaking from the gap between the filling needle 2 and the mold cavity during the blowing process, thereby ensuring the blowing pressure.

[0099] Based on the above specific embodiments, the lower ends of the cooling water inlet channel 203 and the cooling water return channel 204 have openings, and the filling needle 2 also includes a plug 209 for sealing the lower openings of the cooling water inlet channel 203 and the cooling water return channel 204.

[0100] In one specific embodiment, the cooling water inlet channel 203 and the cooling water return channel 204 are straight pipes with openings at the lower ends, making them easy to manufacture. A plug 209 seals the lower openings of the cooling water inlet channel 203 and the cooling water return channel 204, preventing cooling water leakage and ensuring the airtightness of the cooling system. Furthermore, if the plug 209 fails to seal properly, it can be replaced individually without disassembling the entire filling pin, making maintenance and replacement of the cooling water channels more convenient.

[0101] Preferably, a tapered slope is provided on the plug 209. The tapered slope is machined on the side wall of the plug 209, and the cooling water inlet channel 203 and the cooling water return channel 204 are straight pipes, which is convenient for processing.

[0102] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0103] The plastic product molding apparatus provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model. Therefore, this utility model is not limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A plastic article forming apparatus characterized by comprising: The device includes an extrusion mechanism (1) with an extrusion die, a filling mechanism with a filling needle (2), a clamping mechanism (3), and a molding die (4) with a head die (401) and a main die (402). The extrusion die has a support channel (102). The filling needle (2) has a gas channel (201) and is connected to the support channel (102). An annular seam (103) is formed between the support channel (102) and the outer wall of the filling needle (2). Multiple support channels (102) are connected to each other through a transverse channel. A total air inlet channel is connected to the transverse channel. The air inlet of the total air inlet channel is connected to a sterile gas source.

2. The plastic article forming apparatus according to claim 1, wherein Each of the support channels (102) is provided with a control mechanism for controlling the ventilation volume at its air inlet position, the control mechanism comprising: A flow detection unit for detecting the air intake at the air inlet of each of the support channels (102); A control valve connected to the flow detection unit for controlling the air intake volume of all the support channels (102) to be equal.

3. The plastic article forming apparatus according to claim 2, wherein One end of the transverse channel is connected to the main air intake channel, and the inner diameter of the transverse channel is not less than the outer diameter of the annular seam (103).

4. The plastic article forming apparatus according to claim 1, wherein The filling needle (2) includes a filling tube (205), an inner tube (206), a middle tube (207), and an outer tube (208) that are sequentially connected from the inside to the outside. A liquid inlet channel (202) is formed inside the filling tube (205). Three annular channels are formed between the filling tube (205) and the inner tube (206), between the inner tube (206) and the middle tube (207), and between the middle tube (207) and the outer tube (208). The annular channels include a gas channel (201), a cooling water inlet channel (203), and a cooling water return channel (204). The outlet of the cooling water inlet channel (203) is connected to the inlet of the cooling water return channel (204).

5. The plastic product molding apparatus according to claim 4, characterized in that, A gas passage (201) is formed between the filling pipe (205) and the inner pipe (206), a cooling water inlet passage (203) is formed between the inner pipe (206) and the middle pipe (207), and a cooling water return passage (204) is formed between the middle pipe (207) and the outer pipe (208). Alternatively, a cooling water inlet channel (203) is formed between the filling pipe (205) and the inner pipe (206), a cooling water return channel (204) is formed between the inner pipe (206) and the middle pipe (207), and a gas channel (201) is formed between the middle pipe (207) and the outer pipe (208).

6. The plastic article forming apparatus according to claim 4, wherein Multiple connecting holes are provided on the pipe wall between the cooling water inlet channel (203) and the cooling water return channel (204).

7. The plastic article molding apparatus according to claim 4, wherein The liquid outlet of the liquid inlet channel (202) and the gas outlet of the gas channel (201) are located at the lower end of the filling needle (2). The gas outlet of the gas channel (201) is located at the lower edge of the mold opening of the main mold (402). The liquid outlet of the liquid inlet channel (202) is lower than the gas outlet of the gas channel (201).

8. The plastic article molding apparatus according to claim 4, wherein The liquid inlet of the liquid inlet channel (202) is located on the top surface of the filling needle (2), and the gas inlet of the gas channel (201), the water inlet of the cooling water inlet channel (203), and the water return outlet of the cooling water return channel (204) are located on the side wall of the filling needle (2).

9. The plastic article molding apparatus according to claim 4, wherein The sidewall of the filling needle (2) has a tapered slope at the lower end. When the filling needle (2) is inserted into the blank (101), the slope of the filling needle (2) intersects and contacts the mold opening of the main mold (402).

10. The plastic product molding apparatus according to claim 4, characterized in that, The lower ends of the cooling water inlet channel (203) and the cooling water return channel (204) have openings, and the filling needle (2) also includes a plug (209) for sealing the lower openings of the cooling water inlet channel (203) and the cooling water return channel (204).

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