Plastic product forming device and method

Abstract

The invention discloses a plastic product forming device and method which are applied to the technical field of plastic product forming, the plastic product forming device 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, a supporting channel is arranged in the extrusion die head, the filling needle is connected into the supporting channel, and the filling needle is connected into the main die. The filling needle comprises a liquid inlet channel arranged in the center, a gas channel arranged on the periphery of the liquid inlet channel, a cooling water inlet channel and a cooling water return channel, and a liquid outlet of the liquid inlet channel and a gas outlet of the gas channel are formed in the lower end of the filling needle. And the lower ends of the cooling water inlet channel and the cooling water return channel are communicated to form a cooling loop. According to the plastic product forming device and method, 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] The present invention relates to the technical field of plastic product molding, and particularly to a plastic product molding device and method. Background Art

[0002] A BFS (Blow-Fill-Seal) device refers to a device that forms a plastic preform by heating and fusing with an extruder screw, then molds and fills it in a mold, and seals it using the residual heat of the preform after filling. It can complete the processes of bottle making, filling, and sealing in one device.

[0003] The BFS device includes a continuous BFS device and a reciprocating BFS device. Continuity means that during the normal operation of the device, the preform will not be cut by a hot cutting knife, and the entire process is continuously extruded without interruption, and the filling needle is inside the preform. Reciprocation means that during the normal operation of the device, the preform will be cut by a hot cutting knife, and it will be cut once whenever the preform length reaches a cycle length, and usually the filling needle and the preform are in two workstations at different positions.

[0004] Currently, container molding uses a continuous BFS device and a continuous molding process, and the molding of its products adopts the principle of mold vacuum adsorption molding. During the container molding process, a head mold clamp and a main mold clamp are configured, and the container is molded by the vacuum of the main mold and the head mold. The existing filling needle has a three-layer structure with a liquid medicine channel and a cooling channel, but no gas channel, and cannot achieve the functions of blowing and exhausting. The vacuum molding process is mostly used for the molding of small-diameter bottles with small capacities, and for plastic products larger than 20 ml, the molding effect is usually poor or impossible to mold, which greatly limits the capacity of the containers produced by continuous devices and cannot meet the production of some large-capacity, large-diameter or special bottle shapes.

[0005] In the prior art, the molding of products with a volume greater than 30 ml usually adopts the molding process of a reciprocating BFS device. This type of device has the characteristics of low production capacity, poor aseptic safety, and high scrap rate, which severely restricts the application of BFS technology in the industry.

[0006] In summary, how to effectively solve the problems such as the continuous BFS device being unable to meet the production requirements of special bottle shapes and full molding of large-capacity bottle shapes is an urgent problem for those skilled in the art currently. Summary of the Invention

[0007] The object of the present invention is to provide a plastic product forming device, which combines the main mold vacuum suction and filling needle blowing technologies to meet the production requirements of full forming of special bottle types and large-capacity bottle types; another object of the present invention is to provide a plastic product forming method using the above plastic product forming device, and its beneficial effects are the same as those of the plastic product forming device.

[0008] To solve the above technical problems, the present invention provides the following technical solutions.

[0009] A plastic product forming device includes an extrusion mechanism with an extrusion die head, a filling mechanism with a filling needle, a fixture mechanism, and a forming mold with a head mold and a main mold. A support channel is provided in the extrusion die head, and the filling needle is connected in the support channel. The filling needle includes a liquid inlet channel provided at the central position, a gas channel provided on the outer periphery of the liquid inlet channel, a cooling water inlet channel, and a cooling water return channel. The liquid outlet of the liquid inlet channel and the gas outlet of the gas channel are provided at the lower end of the filling needle, and the cooling water inlet channel and the cooling water return channel are connected at the lower end to form a cooling circuit.

[0010] Optionally, the gas channel, the cooling water inlet channel, and the cooling water return channel are arranged in sequence from the inside to the outside. The liquid inlet of the liquid inlet channel is provided 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 port of the cooling water return channel are provided on the side wall of the filling needle and arranged from high to low in sequence. The liquid outlet of the liquid inlet channel is located below the gas outlet of the gas channel.

[0011] Optionally, the side wall of the filling needle has a tapered inclined surface at the lower end. When the filling needle is inserted into the preform, the inclined surface of the filling needle intersects and contacts the mold opening of the main mold.

[0012] Optionally, an annular gap is formed between the support channel and the outer wall of the filling needle. Sterile gas is introduced into the support channel, and the sterile gas sprays out from the upper end of the annular gap to form a sterile chamber, and the sterile gas moves downward along the annular gap and enters the preform.

[0013] Optionally, it further includes a punching mechanism, which includes a female die pressing plate, a male die pressing plate, a punching female die, and a punching male die. The female die pressing plate and the male die pressing plate are respectively installed on the bottom surfaces of the left and right molds of the main mold. The punching female die is fixedly connected to the female die pressing plate, and the punching male die can move horizontally relative to the male die pressing plate to be combined with the punching female die for punching.

[0014] Optionally, it further includes a conveying mechanism provided below the punching female die, and the conveying mechanism includes a conveyor belt and a guardrail.

[0015] It also includes a blanking channel connecting the conveying mechanism and the punching mechanism, the blanking channel includes an inclined slide connected to the end of the mold cavity of the punching die and a vertical slide arranged above the conveying mechanism, the upper end of the vertical slide is provided with a feed port, the plastic products sliding down the inclined slide slide into the feed port of the vertical slide, and the vertical slide coincides with the projection of the guardrail on the conveyor belt.

[0016] Optionally, the concave die pressing plate and / or the convex die pressing plate are provided with a water cooling channel, and a coolant flows into the water cooling channel.

[0017] The present invention provides a method for forming a plastic product using any of the above-mentioned plastic product forming devices, comprising the steps of: Continuously extrude the hollow hot melt parison; The parison is sealed, and the parison is tightened and moved downward until it moves to the closing position of the main mold; The main mold is closed, the filling needle is moved downward, the filling needle is fitted with the mold opening of the main mold to form a seal, and high-pressure gas is introduced into the gas channel of the filling needle to form a plastic product; Opening the gas channel to discharge the high-pressure gas in the parison and injecting liquid medicine into the liquid inlet channel of the filling needle; The filling needle is moved upward, and the head mold is closed to seal the plastic product; The head mold clamps the product chain and opens the main mold and the head mold.

[0018] Optionally, the punching mechanism is installed on the bottom surface of the main mold, and after opening the molding mold, it also includes: opening the upper clamp so that the lower clamp pulls the product chain to move to the punching station, and the punching mechanism follows the main mold to close the mold to press the product chain and punch the plastic products off the product chain.

[0019] Optionally, before continuously extruding the hollow hot-melt parison, the method further includes: introducing sterile gas into the supporting channel.

[0020] The beneficial effects of the present invention are as follows. The plastic product forming device provided by the present invention has a filling needle including a liquid inlet channel, a gas channel, and a cooling water channel. The liquid outlet of the liquid inlet channel is located at the bottom surface of the filling needle, ensuring that the liquid medicine can be accurately injected into the plastic product. The gas channel is arranged on the outer periphery of the liquid inlet channel, and its gas outlet is located at the bottom surface of the filling needle. During the forming process of the plastic product, high-pressure gas is blown into the parison through the gas channel, making the parison film bubble fully fit with the mold cavity to form a plump bottle body. The cooling water inlet channel and the cooling water return channel are connected at the lower end of the filling needle to form a cooling loop. The cooling water enters through the cooling water inlet channel, flows out through the cooling water return channel after passing through the cooling loop, taking away heat, ensuring that the parison is quickly and evenly cooled and solidified, avoiding bubbles and defects, and improving the forming efficiency and product quality. The four-layer structure of the filling needle realizes the precise transportation of the liquid medicine, the efficient forming of the bottle body, and the rapid cooling during the forming process, significantly improving the forming efficiency and product quality.

[0021] The forming mold includes a head mold and a main mold, which together constitute the mold cavity of the plastic product. During the forming process, when the parison extruded by the extrusion die head reaches the main mold closing position, the main mold closes, and the parison at the corresponding position of the main mold is pressed. While pressing, the vacuum pipeline of the forming mold is connected to the vacuum gas, and the vacuum gas adsorbs the parison film bubble to stick to the mold cavity. At the same time, the lower end of the filling needle is docked with the cavity, and the gas channel of the filling needle is filled with blowing high-pressure gas. The high-pressure gas exerts an outward force on the parison, making the parison film bubble fully fit with the main mold cavity, thereby forming a plastic product with a plump bottle body.

[0022] After the forming is completed, the gas channel of the filling needle is opened, and the high-pressure gas in the plastic product starts to exhaust through the gas channel. After the exhaust is completed, the liquid inlet channel of the filling needle is connected, and the liquid medicine is injected into the plastic product to achieve filling. After the filling is completed, the filling needle moves upward, and the head mold closes to achieve sealing of the plastic product.

[0023] The plastic product forming device provided by the present invention has the functions of inflating and blow molding and exhausting and filling for the filling needle. It can not only blow air into the parison to form a bubble that fully fits with the bottle cavity of the main mold to form a plump bottle body, but also discharge the gas in the container before filling, balance the pressure difference inside and outside the container, and ensure smooth filling of the liquid medicine.

[0024] When producing large-capacity containers (such as containers larger than 20 ml) or special bottle types, the forming mold sucks vacuum and the filling needle blows air simultaneously to ensure that the parison closely fits the mold cavity, meet the forming requirements of special bottle types and large-capacity bottle types, realize diversified production requirements, and provide reliable technical support for the wide application of continuous BFS equipment.

[0025] The present invention also provides a method for forming a plastic product, using any one of the above plastic product forming devices. Since the above plastic product forming device has the above technical effects, the plastic product forming method using this plastic product forming device should also have corresponding technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1 It is a schematic structural diagram of a plastic product forming device provided by a specific embodiment of the present invention.

[0028] Figure 2 It is another view of the plastic product forming device.

[0029] Figure 3 For Figure 1 It is an enlarged view of the filling needle in

[0030] Figure 4 It is a schematic diagram of parison discharging and initial parison sealing in the plastic product forming method.

[0031] Figure 5 It is a schematic diagram of hollow bottle forming in the plastic product forming method.

[0032] Figure 6 It is a schematic diagram of filling and sealing in the plastic product forming method.

[0033] Figure 7 It is a schematic diagram of mold opening in the plastic product forming method.

[0034] Figure 8 It is a schematic diagram of the upper clamp opening in the plastic product forming method.

[0035] Figure 9 It is a schematic diagram of the lower clamp pulling the product chain down in the plastic product forming method.

[0036] Figure 10 It is a schematic diagram of the punching mechanism following the closing of the forming mold in the plastic product forming method.

[0037] Figure 11 It is a schematic diagram of the upper cycle punching and the lower cycle canning in the plastic product forming method.

[0038] Figure 12 It is a schematic diagram of the upper cycle plastic product blanking and the lower cycle sealing in the plastic product forming method.

[0039] Figure 13 It is a schematic diagram of mold opening in the next cycle in the plastic product forming method.

[0040] Figure 14 It is a flow chart of the plastic product forming method.

[0041] Reference numerals.

[0042] 1 - Extrusion mechanism; 101 - Parison; 102 - Support channel; 103 - Annular seam; 2 - Filling needle; 201 - Gas channel; 202 - Liquid inlet channel; 203 - Cooling water inlet channel; 204 - Cooling water return channel; 3 - Clamping mechanism; 301 - Upper clamp; 302 - Lower clamp; 4 - Forming mold; 401 - Head mold; 402 - Main mold; 403 - Positioning press hole; 5 - Product chain; 501 - Plastic product; 502 - Positioning block; 503 - Scrap; 6 - Punching mechanism; 601 - Die pressing plate; 602 - Punch pressing plate; 603 - Punching die; 604 - Punching punch; 605 - Die positioning hole; 606 - Punch positioning hole; 607 - Inclined slideway; 608 - Water cooling channel; 609 - Vertical slideway; 7 - Conveying mechanism; 701 - Conveyor belt; 702 - Guardrail. Detailed implementation manners

[0043] The core of the present invention is to provide a plastic product forming device, which combines the main mold vacuum suction and filling needle blowing technologies to meet the production requirements for the full formation of special bottle shapes and large - capacity bottle shapes; another core of the present invention is to provide a plastic product forming method using the above - mentioned plastic product forming device, and its beneficial effects are the same as those of the plastic product forming device.

[0044] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0045] Please refer to Figure 1 、 Figure 2 and Figure 3 , which is a schematic structural diagram of the plastic product forming device provided by a specific implementation manner in the present invention.

[0046] In a specific embodiment, the plastic product forming device provided by the present invention includes an extrusion mechanism 1 with an extrusion die head, a filling mechanism with a filling needle 2, a fixture mechanism 3, and a forming die 4 with a head die 401 and a main die 402. A support channel 102 is provided in the extrusion die head, and the filling needle 2 is connected to the support channel 102. The filling needle 2 includes a liquid inlet channel 202 provided at the central position, a gas channel 201 provided on the outer periphery of the liquid inlet channel 202, a cooling water inlet channel 203, and a cooling water return channel 204. The liquid outlet of the liquid inlet channel 202 and the gas outlet of the gas channel 201 are provided at the lower end of the filling needle 2, and the cooling water inlet channel 203 and the cooling water return channel 204 are connected at the lower end to form a cooling loop.

[0047] In the above structure, the plastic product forming device realizes the efficient forming and processing of plastic products through the coordinated work of the extrusion mechanism 1, the filling mechanism, the forming die 4, and the fixture mechanism 3.

[0048] The extrusion mechanism 1 includes an extrusion die head, a hopper, and an extrusion screw. Plastic particles fall from the hopper into the screw channel, are melted and plasticized under the dual action of the heating system and the shearing force of the rotating screw, and then the molten plastic is extruded into the extrusion die head through the extrusion action of the screw. Finally, the molten plastic is extruded from the die gap of the extrusion die head to form an oval hollow hot-melt preform 101.

[0049] The filling mechanism includes a filling needle 2 and a lifting mechanism for driving the filling needle 2 to move up and down. The extrusion die head is provided with a support channel 102, and the support channel 102 is arranged vertically to provide an installation and positioning space for 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 transportation of liquid and gas.

[0050] The filling needle 2 has a four-layer structure, including a liquid inlet channel 202, a gas channel 201, and a cooling water channel. The liquid outlet of the liquid inlet channel 202 is located at the bottom surface of the filling needle 2 to ensure that the liquid medicine can be accurately injected into the plastic product 501.

[0051] The gas channel 201 is provided on the outer periphery of the liquid inlet channel 202, and its gas outlet is located at the bottom surface of the filling needle 2. During the forming process of the plastic product 501, high-pressure gas is blown into the preform 101 through the gas channel 201 to make the film bubble of the preform 101 fully fit with the mold cavity to form a plump bottle body, which helps the plastic product to be better formed in the mold.

[0052] The cooling water channel includes an inlet cooling water channel 203 and a return cooling water channel 204. The inlet cooling water channel 203 and the return cooling water channel 204 communicate at the lower end of the filling needle 2 to form a cooling loop. 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 to form a cooling cycle. The cooling water enters through the inlet cooling water channel 203, passes through the cooling loop, and then flows out through the return cooling water channel 204, taking away heat to ensure that the preform 101 is quickly and evenly cooled and solidified, avoiding bubbles and defects, and improving the molding efficiency and product quality.

[0053] The four-layer structure of the filling needle 2 realizes the precise delivery of the liquid medicine, the efficient molding of the bottle body, and the rapid cooling of the molding process, significantly improving the molding efficiency and product quality.

[0054] The molding die 4 includes a head die 401 and a main die 402, which together constitute the mold cavity for plastic products. During the molding process, when the preform 101 extruded from the extrusion die head reaches the mold closing position of the main die 402, the main die 402 closes the mold and presses the preform 101 at the corresponding position of the main die 402. While pressing, the vacuum pipeline of the molding die 4 is connected to the vacuum gas, and the vacuum gas adsorbs the preform 101 film bubble against the mold cavity. At the same time, the lower end of the filling needle 2 is docked with the cavity, and the gas channel 201 of the filling needle 2 is introduced with the high-pressure blowing gas for the bottle. The high-pressure gas exerts an outward force on the preform 101, causing the preform 101 film bubble to completely fit the cavity of the main die 402, thereby molding a plastic product 501 with a full bottle body.

[0055] After the molding is completed, the gas channel 201 of the filling needle 2 is opened, and the high-pressure gas in the plastic product 501 starts to exhaust through the gas channel 201. After the exhaust is completed, the liquid inlet channel 202 of the filling needle 2 is connected, and the liquid medicine is injected into the plastic product 501 to achieve filling. After the filling is completed, the filling needle 2 moves upward, and the head die 401 closes the mold to achieve the sealing of the plastic product 501. It should be noted that during the blowing process, the gas channel 201 is the blowing channel, and during the exhaust process, the gas channel 201 is the exhaust channel, and the intake and outlet ports are interchanged in both processes.

[0056] The fixture mechanism 3 includes an upper fixture 301 and a lower fixture 302. The upper fixture 301 is located on the top surface of the head die 401, and the lower fixture 302 is initially located on the bottom surface of the main die 402, avoiding the mold closing position. During the molding process, the fixture mechanism 3 is used to fix the preform 101 or the product chain 5 to ensure that the preform 101 and the product chain 5 can maintain a stable position during the molding and punching processes, avoiding a decrease in molding quality caused by movement or vibration.

[0057] The filling needle 2 of the plastic product forming device provided by the present invention has the functions of inflation blow molding and exhaust canning. It can not only blow air into the preform 101 to form the film bubble and the bottle cavity of the main mold 402 to completely fit together to form a full bottle body; it can also exhaust the gas in the container before filling, balance the pressure difference between the inside and outside of the container, and ensure smooth filling of the liquid medicine.

[0058] When producing large-capacity (such as containers larger than 20 ml) or special bottle shapes, the forming mold 4 vacuums 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 wide application of continuous BFS equipment.

[0059] Based on the above-mentioned specific embodiments, the gas channel 201, the cooling water inlet channel 203, and the cooling water return channel 204 are arranged in sequence from the inside to the outside, the liquid inlet of the liquid inlet channel 202 is arranged on the top surface of the filling needle 2, the air inlet of the gas channel 201, the water inlet of the cooling water inlet channel 203, and the water return port of the cooling water return channel 204 are arranged on the side wall of the filling needle 2 and are arranged in sequence from high to low, and the liquid outlet of the liquid inlet channel 202 is located below the air outlet of the gas channel 201.

[0060] In a specific embodiment, the filling needle 2 adopts a four-layer structure, which is composed 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 to the outside. The thermal conductivity of gas is smaller than that of liquid, and the heat transfer capacity of gas is lower than that of liquid. The gas channel 201 is arranged between the liquid inlet channel 202 and the cooling water channel, which can reduce the transfer of heat from gas to liquid, thereby 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, so that the cooling water can be closer to the liquid, quickly take away the heat of the liquid, and ensure that the liquid maintains an appropriate temperature when entering the mold cavity.

[0061] The liquid inlet channel 202 is located at the central axis and is used to accurately deliver the liquid medicine to the mold cavity. The liquid inlet of the liquid inlet channel 202 is set on the top surface of the filling needle 2, and the liquid medicine is vertically injected into the liquid inlet channel 202 to reduce the flow resistance of the liquid medicine. The liquid outlet of the liquid inlet channel 202 is located on the bottom surface of the filling needle 2, and the position of the liquid outlet is lower than the position of the gas outlet of the gas channel 201, so that the liquid medicine can flow more smoothly when entering the mold cavity; the liquid medicine injection process is accompanied by the exhaust process, and the liquid medicine injection and gas exhaust are horizontally and vertically staggered to reduce mutual interference.

[0062] The gas channel 201 is used for blow molding to make the preform 101 film bubble fully conform to the mold cavity, forming a plump bottle body. The gas channel 201 is an annular channel that surrounds the outer periphery of the liquid inlet channel 202. The gas inlet is provided on the upper side wall of the filling needle 2, and the gas outlet is provided on the bottom surface of the filling needle 2. The position of the gas outlet is higher than the liquid outlet position of the liquid inlet channel 202, and the position of the gas outlet is close to the mold opening position of the mold cavity. The gas diffuses uniformly along the mold cavity from the mold opening position during the blowing process, ensuring that the preform 101 film bubble can expand smoothly and completely conform to the mold cavity.

[0063] The water inlet of the cooling water inlet channel 203 is provided on the side wall of the filling needle 2 and is lower than the gas inlet of the gas channel 201. The water return port of the cooling water return channel 204 is provided on the side wall of the filling needle 2 and is lower than the water inlet of the cooling water inlet channel 203. Preferably, when it does not affect the normal up and down movement of the filling needle 2, the water return port position of the cooling water return channel 204 is set at the position closest to the lower end to the maximum extent, and the water inlet position of the cooling water inlet channel 203 is set at the position closest to the upper edge to the maximum extent, so that the cooling water flows through the entire height of the filling needle 2 to the maximum extent, enabling the hot water after cooling to be discharged through a shorter path, increasing the cooling range of the cooling water, reducing the heat conduction of the hot water to the cooling water, and maintaining the efficient cooling of the cooling water.

[0064] In the above embodiments, the heat conduction characteristics of gas and liquid are fully utilized, the thermal management of the molding process is optimized, and the molding efficiency and product quality are improved.

[0065] In a preferred embodiment, the filling needle 2 adopts a four-layer structure, which is the liquid inlet channel 202, the cooling water inlet channel 203, the cooling water return channel 204, and the gas channel 201 from the inside to the outside in sequence. The liquid inlet of the liquid inlet channel 202 is provided on the top surface of the filling needle 2, and the openings of the cooling water inlet channel 203, the cooling water return channel 204, and the gas channel 201 are provided on the side wall of the filling needle 2 and are arranged from high to low in sequence. The liquid outlet of the liquid inlet channel 202 is lower than the gas outlet of the gas channel 201.

[0066] In the above embodiments, the gas channel 201 is relatively close to the mold cavity, and the action distance of the high-pressure gas on the preform 101 is relatively close, shortening the fitting time between the preform 101 film bubble and the mold cavity and improving the molding efficiency of the plastic product 501.

[0067] On the basis of the above specific embodiments, the side wall of the filling needle 2 has a tapered inclined surface at the lower end. When the filling needle 2 is inserted into the preform 101, the inclined surface of the filling needle 2 intersects and contacts the mold opening of the main mold 402.

[0068] In a specific embodiment, the side wall of the filling needle 2 has a tapered inclined surface at the lower end position, that is, the lower end of the filling needle 2 gradually tapers to form a conical fitting 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 the resistance and friction during the insertion process.

[0069] During the insertion process, the lower end inclined surface of the filling needle 2 intersects and contacts the mold opening of the mold cavity. The conical fitting 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 are closely fitted to ensure the sealing between the filling needle 2 and the mold cavity, preventing the 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.

[0070] Based on the above various specific embodiments, an annular gap 103 is formed between the support channel 102 and the outer wall of the filling needle 2. Sterile gas (such as sterilized and filtered compressed air) is introduced into the support channel 102. The sterile gas sprays out from the upper end of the annular gap 103. The sterile gas forms a sterile chamber above the part of the filling needle 2 that extends beyond the support channel 102. The sterile chamber wraps the upper part of the filling needle 2, effectively isolating external contamination and achieving sterile protection for the filling needle 2.

[0071] At the same time, the sterile gas moves downward along the annular gap 103 and enters the preform 101, forming a positive pressure support inside the preform 101 to effectively support the hollow film bubble, prevent the hollow film bubble from collapsing, and ensure the stable shape of the preform 101.

[0072] In a preferred embodiment, the multiple support channels 102 are connected through a transverse channel. A total air inlet channel is connected to the transverse channel. The sterile gas is distributed to each support channel 102 through the total air inlet channel and the transverse channel. The structure is simple and the sterile gas is easy to control. In order to ensure uniform distribution of the sterile gas in each support channel 102, a control valve can be provided at the air inlet position of each support channel 102.

[0073] Furthermore, the inner diameter of the transverse channel connecting each support channel 102 can be set to different diameters, such as the diameter near the total air inlet channel is smaller than the diameter far from the total air inlet channel, to ensure that the sterile gas can reach each support channel 102 simultaneously and the sterile gas is evenly distributed in each support channel 102.

[0074] Based on the above specific embodiments, it further includes a punching mechanism 6. The punching mechanism 6 includes a female die pressing plate 601, a male die pressing plate 602, a punching female die 603 and a punching male die 604. The female die pressing plate 601 and the male die pressing plate 602 are respectively installed on the bottom surfaces of the left and right dies of the main die 402. The punching female die 603 is fixedly connected to the female die pressing plate 601, and the punching male die 604 can move horizontally relative to the male die pressing plate 602 to close the die with the punching female die 603 for punching.

[0075] In a specific embodiment, after the plastic product is formed, the punching mechanism 6 performs punching on the product chain 5 to remove the scraps at the corners of the redundant product chain 5 or perform specific shape trimming, and punches out the plastic product that meets the final size and appearance requirements.

[0076] The punching mechanism 6 is installed at the bottom of the main die 402, and the female die pressing plate 601 and the male die pressing plate 602 are respectively installed on the lower end surfaces of the left and right dies of the main die 402. The pressing plates move synchronously with the main die 402, so as to realize the positioning and pressing of the product chain 5 while the plastic bottle is being formed. After pressing, the plastic product 501 is punched off under the action of the punch.

[0077] The punching female die 603 and the punching male die 604 are the punches of the punching mechanism 6, and a punching cavity is provided in the punching female die 603 and the punching male die 604. The punching female die 603 plays a role in forming and positioning during the punching process, and the punching male die 604 plays a role in cutting and forming during the punching process, ensuring that the plastic product after punching reaches the required shape and size.

[0078] The top surface of the punching female die 603 is fixedly connected to the bottom surface of the female die pressing plate 601. The female die pressing plate 601 provides stable support and positioning for the punching female die 603, ensuring the accuracy of the punching process. Preferably, the punching female die 603 and the female die pressing plate 601 can be an integral structure, omitting the connection process.

[0079] The punching male die 604 can move horizontally relative to the male die pressing plate 602 to close the die with the punching female die 603 for punching. Since the matching accuracy of the punching female die 603 and the punching male die 604 directly affects the quality of the plastic product after punching, the top surface of the punching male die 604 is slidably connected to the bottom surface of the male die pressing plate 602. Guide rails that cooperate with each other are provided on the top surface of the punching male die 604 and the bottom surface of the male die pressing plate 602. The punching male die 604 moves along the guide rails, and the movement trajectory is accurate, ensuring the high precision and stability of the punching process, reducing the resistance and wear during the punching process, and improving the matching accuracy of the punching female die 603 and the punching male die 604.

[0080] After the product chain 5 is formed, the punching mechanism 6 starts to work. The pressing plates on both sides approach each other following the mold closing movement of the main mold 402. The punching female die 603 and the punching male die 604 move synchronously with the pressing plates. When the main mold 402 is fully closed, the pressing plates clamp the positioning part of the product chain 5. The punching male die 604 moves towards the punching female die 603 under the action of the driving mechanism, and cooperates with the punching female die 603 to punch the plastic product. This process makes good use of the repeated mold closing action of the main mold 402, synchronously realizes the clamping and punching of the product chain 5, improves the accuracy during punching, ensures the quality of the plastic product after punching, reduces the scrap rate, and improves the production efficiency.

[0081] The punching mechanism 6 is installed on the forming mold 4, with a compact structure; the punching mechanism 6 and the forming mold 4 share a set of mold closing driving mechanisms, which simplifies the structure and reduces the cost.

[0082] It should be noted that since the punching mechanism 6 and the forming mold 4 are an integral structure, during the forming process, the lower fixture 302 is initially located below the punching mechanism 6 to avoid mold closing. The lower fixture 302 can move up and down. After the plastic product 501 is formed and canned, the lower fixture 302 moves up to the position of the main mold 402, tightens the plastic product 501 and moves it down, moves to below the punching mechanism 6, avoids the mold closing position, and then closes the mold. The forming process of the next cycle and the punching of the previous cycle are carried out synchronously, improving the forming efficiency.

[0083] In a preferred embodiment, the main mold 402 is provided with positioning pressing holes 403. During the process of the main mold 402 pressing and forming the plastic product 501, the positioning pressing holes 403 form positioning blocks 502 on the preform 101. The punching female die 603 and the punching male die 604 are provided with female die positioning holes 605 and male die positioning holes 606 that match the positioning blocks 502. The positioning structure for the punching process is machined on the preform 101 through the positioning pressing holes 403 to ensure the correct punching position and prevent punching failure caused by the incorrect position of the product chain 5.

[0084] Based on the above various specific embodiments, it further includes a conveying mechanism 7 provided below the punching female die 603. The conveying mechanism 7 includes a conveyor belt 701 and a guardrail 702.

[0085] It further includes a blanking channel connecting the conveying mechanism 7 and the punching mechanism 6. The blanking channel includes an inclined slideway 607 connected to the end of the mold cavity of the punching female die 603 and a vertical slideway provided above the conveying mechanism 7. The upper end of the vertical slideway is provided with a feed inlet. The plastic product sliding down from the inclined slideway 607 slides into the feed inlet of the vertical slideway, and the vertical slideway coincides with the projection of the guardrail 702 on the conveyor belt 701.

[0086] In a specific embodiment, the conveying mechanism 7 is disposed below the punching die 603 to receive the punched plastic products and convey the punched plastic products to a subsequent processing or packaging process. The conveying mechanism 7 includes a conveyor belt 701 and a guardrail 702. The guardrail 702 is disposed on both sides of the conveyor belt 701 to prevent the plastic products from deflecting or falling.

[0087] The blanking channel includes an inclined slide 607 and a vertical slide. There is a gap between the inclined slide 607 and the vertical slide 609, which is reserved for the mold to move up and down. The inclined slide 607 is arranged at the end of the mold cavity of the punching die 603, and has an inclined surface that is inwardly connected to the feed port at the upper end of the vertical slide. The vertical slide is arranged above the conveying mechanism 7, along the vertical direction, for receiving the plastic products that slide out from the inclined slide 607.

[0088] The plastic product slides along the inclined slide 607 into the vertical slide, and then falls onto the conveyor belt 701 along the vertical slide. The inclined slide 607 has a guiding function to guide the sliding direction of the plastic product. The vertical slide has a positive positioning effect on the plastic product, keeping the plastic product falling on the conveyor belt 701 in the vertical direction, ensuring that the punched plastic product can be smoothly transferred from the punching die 603 to the conveying mechanism 7.

[0089] In a preferred embodiment, the maximum distance between the inclined slide 607 and the vertical slide 609 is smaller than the height of the plastic product. When the lower end of the plastic product slides into the vertical slide 609, the upper end is still supported on the inclined slide 607. The inclined slide 607 and the vertical slide 609 limit the sliding path of the plastic product, guide the moving direction of the plastic product, and prevent the plastic product from falling from the distance between the inclined slide 607 and the vertical slide 609, thereby ensuring that the punched plastic product can be smoothly transferred from the punching die 603 to the conveying mechanism 7.

[0090] On the basis of the above-mentioned specific embodiments, a water cooling channel 608 is provided on the concave die pressing plate 601 and / or the convex die pressing plate 602 , and a coolant is passed through the water cooling channel 608 .

[0091] In a specific embodiment, the temperature of the product chain 5 just out of the mold is relatively high, and it is easy to produce adverse consequences such as wire drawing during punching. Therefore, a water cooling channel 608 is provided on the punching plate, and coolant is passed into the water cooling channel 608 to achieve cooling of the product chain 5.

[0092] During the punching process, the pressure plate is fixed in position and relatively close to the product chain 5. The water cooling channel 608 can be provided on the concave die pressure plate 601 and / or the convex die pressure plate 602. The water cooling channel 608 is conveniently connected to the water channel joint, and the connection sealing is better.

[0093] In addition to the above plastic product forming device, the present invention also provides a plastic product forming method, which can use the above plastic product forming device. This plastic product forming method is used to form plastic products. Please refer to Figure 14 , and includes the following steps: Step S100: Continuously extrude a hollow and hot-melt preform 101; Step S110: Seal the preform 101, tighten the preform 101 and move it downward until it reaches the mold closing position of the main mold 402; Step S120: Close the main mold 402, lower the filling needle 2 so that the filling needle 2 fits with the mold opening of the main mold 402 to form a seal, and introduce high-pressure gas into the gas passage 201 of the filling needle 2 to form the plastic product 501; Step S130: Open the gas passage 201, discharge the high-pressure gas in the preform 101, and inject the liquid medicine into the liquid inlet passage 202 of the filling needle 2; Step S140: Raise the filling needle 2, close the head mold 401 to seal the plastic product 501; Step S150: The head mold 401 clamps the product chain 5, and opens the main mold 402 and the head mold 401.

[0094] For the convenience of description, the above several steps will be combined and described below.

[0095] In practical applications, the plastic product forming method integrates the preform 101 forming, blow molding, filling and sealing in a continuous production process. The process of forming plastic products is as follows.

[0096] Preform 101 discharging: As Figure 4 shown, the extrusion die head extrudes a hot-melt and hollow preform 101, and the preform 101 is continuously extruded until it reaches an appropriate length. During the discharging process of the preform 101, it should be ensured that the preform 101 has sufficient length and uniform wall thickness to provide a basis for subsequent forming and filling.

[0097] Initial sealing of the preform 101: As Figure 4 shown, the lower fixture 302 closes the mold to seal the hot-melt preform 101, and tightens and moves the hot-melt preform 101 downward. Repeat 1-3 cycles. Through the sealing and tightening operations, it is ensured that the preform 101 remains stable during the subsequent forming process. During the process of tightening and moving the hot-melt preform 101 downward, there is supporting gas inside the preform 101 to ensure that the preform 101 maintains its shape during the blow molding process.

[0098] Empty bottle forming: As Figure 5As shown, when the hot-melt parison 101 moves down to the mold closing position of the main mold 402, the main mold 402 closes, and the parison 101 at the corresponding position of the main mold 402 is pressed. While pressing, the vacuum pipeline of the forming mold 4 is connected to the vacuum gas, and the vacuum gas adsorbs the parison 101 film bubble against the mold cavity.

[0099] Meanwhile, the filling needle 2 moves down, and the lower end of the filling needle 2 fits and docks with the cavity to achieve a sealed connection, preventing gas leakage, ensuring a relatively high pressure and sterility during the forming process. High-pressure gas is introduced into the gas passage 201 of the filling needle 2, and the high-pressure gas exerts an outward force on the parison 101, causing the parison 101 film bubble to completely fit against the cavity of the main mold 402, thereby forming a plastic product 501 with a plump bottle body.

[0100] In the formation of an empty bottle, under the dual action of vacuum and high-pressure gas, the film bubble closely adheres to the mold cavity, forming the required bottle body shape, and the forming quality of the plastic bottle is relatively high.

[0101] Filling: As Figure 6 shown, the gas passage 201 is opened to discharge the high-pressure gas inside the bottle, maintaining the internal and external pressure balance. The liquid medicine enters the plastic product 501 through the liquid inlet passage 202 to achieve liquid medicine filling. When the filling liquid level is reached, the filling ends.

[0102] The filling liquid level can be controlled by setting a flow detection mechanism, such as a flowmeter, in the liquid inlet passage 202 of the filling needle 2, thereby precisely controlling the consistency and accuracy of the liquid medicine.

[0103] Sealing: As Figure 6 shown, after the 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 501. By sealing the plastic product 501 with the head mold 401, the sealing performance and stability of the plastic product 501 are ensured, preventing liquid medicine leakage and external contamination.

[0104] Mold opening: As Figure 7 shown, after the sealing is completed, the upper clamp 301 and the lower clamp 302 simultaneously clamp the product chain 5. The upper clamp 301 clamps above the head mold 401, and the lower clamp 302 rises to the main mold 402 and clamps below the plastic product 501. The forming mold 4 is opened, and the upper clamp 301 is opened. Through the coordinated action of the upper clamp 301 and the lower clamp 302, it is ensured that the formed plastic bottle can be smoothly removed from the forming mold 4, preparing for subsequent punching and conveying.

[0105] Repeating the steps of empty bottle forming, filling, sealing, and mold opening can achieve the processes of forming, filling, and sealing of the large-capacity plastic product 501.

[0106] In the above embodiments, the BFS process integrates the preform 101 forming, blow molding, filling, and sealing in a continuous production process, with a high degree of automation, reducing manual intervention and improving production efficiency. During the forming process, the main mold 402 sucks vacuum and the filling needle 2 blows air simultaneously, ensuring that the preform 101 closely adheres to the mold cavity, meeting the forming requirements of special bottle shapes and large-capacity bottle shapes, meeting diverse production needs, and providing reliable technical support for the wide application of continuous BFS equipment. Before filling, the gas in the plastic product 501 is discharged to balance the pressure difference inside and outside the container, ensuring smooth liquid medicine filling.

[0107] In some embodiments, the punching mechanism 6 is installed on the bottom surface of the main mold 402. After the forming mold 4 is opened, it further includes: opening the upper clamp 301, enabling the lower clamp 302 to pull the product chain 5 to move to the punching station, and the punching mechanism 6 follows the closing of the main mold 402 to press the product chain 5, punching the plastic product from the product chain 5, as Figure 8 、 Figure 9 、 Figure 10 shown.

[0108] In practical applications, after the forming mold 4 is opened, the plastic product forming method further includes: a punching step.

[0109] After the product chain 5 is formed, the punching mechanism 6 starts to work. The product chain 5 moves to the punching station under the traction of the lower clamp 302, and at the same time, the plastic bottle forming process of the next cycle begins. The pressure plates on both sides move closer following the closing action of the main mold 402, and the punching female die 603 and the punching male die 604 move synchronously with the pressure plates. When the main mold 402 is fully closed, the pressure plates press the positioning part of the product chain 5. The punching male die 604 moves towards the punching female die 603 under the action of the driving mechanism, and cooperates with the punching female die 603 to punch the plastic product. The plastic product punched from the product chain 5 falls into the conveyor belt 701 along the blanking channel. The waste 503 remains between the punching female die 603 and the punching male die 604 and continues to move downward. Through the punching operation, the formed plastic product 501 is separated from the product chain 5 and transferred to the conveyor belt 701 through the blanking channel, completing the entire production process, as Figure 11 、 Figure 12 、 Figure 13 shown.

[0110] This process makes good use of the repeated closing action of the main mold 402, synchronously realizing the pressing and punching of the product chain 5, improving the accuracy during punching, ensuring the quality of the plastic product after punching, reducing the rejection rate, and improving production efficiency.

[0111] It should be noted that during the processes of empty bottle forming, filling, sealing, and mold opening, the mold moves downward according to the blanking speed of the preform 101 to match the blanking speed of the preform 101, avoiding the accumulation of the preform 101 during continuous blanking. After punching, the mold rises to cycle the next cycle of plastic bottle forming process.

[0112] In a preferred embodiment, the lower fixture 302 is used to tow the product chain 5 to the punching station, and the method further includes the steps of: detecting whether the positioning block 502 on the product chain 5 is aligned with the female die positioning hole 605 and the male die positioning hole 606 of the punching mechanism 6. If so, stop the downward movement of the product chain 5, and clamp the female die positioning hole 605 and the male die positioning hole 606 on the positioning block 502; if not, continue to tow the product chain 5 downward until the positioning block 502 on the product chain 5 is aligned with the female die positioning hole 605 and the male die positioning hole 606 of the punching mechanism 6.

[0113] In practical applications, when the lower fixture 302 is used to tow the product chain 5 to the punching station, the following steps are further included: there is a positioning block 502 on the product chain 5, and there are a female die positioning hole 605 and a male die positioning hole 606 on the punching mechanism 6. Detect whether the positioning block 502 is aligned with the female die positioning hole 605 and the male die positioning hole 606, that is, detect whether the plastic product on the product chain 5 is aligned with the mold cavity in the punching mechanism 6. If the position is detected to be aligned, stop the downward movement of the product chain 5, clamp the female die positioning hole 605 and the male die positioning hole 606 on the positioning block 502, determine that the punching process can be carried out, and separate the plastic product from the product chain 5 to form the final product.

[0114] If it is detected that the positioning block 502 on the product chain 5 is not aligned with the positioning holes in the punching mechanism 6, the position of the product chain 5 needs to be adjusted. When the height position is not aligned, continue to tow the product chain 5 downward until the positioning block 502 on the product chain 5 is aligned with the positioning holes of the punching mechanism 6. If the height position is aligned but the lateral position is offset, the lateral position of the product chain 5 can be adjusted so that the plastic product can be accurately aligned with the mold cavity of the punching mechanism, ensuring that the plastic product can accurately cooperate with the punching die during the punching process and avoiding incomplete punching or damage caused by position deviation.

[0115] Specifically, to detect whether the positioning block 502 is aligned with the female die positioning hole 605 and the male die positioning hole 606, the position of the positioning block 502 can be detected in real time by a vision detection unit such as a high-precision industrial camera, or a position sensor or a photoelectric sensor, ensuring the accurate position of the positioning block 502 and realizing the alignment of the positioning block 502 with the positioning holes.

[0116] The detection unit, position sensor, or photoelectric sensor can be installed on the bottom surfaces of the female die positioning hole 605 and the male die positioning hole 606, facing the positioning block 502, to monitor the position of the positioning block 502 in real time, promptly detect and correct position deviations, and reduce the rejection rate.

[0117] The lateral position adjustment can finely adjust the position of the product chain 5 through mechanical mechanisms such as a fine adjustment mechanism to ensure that the plastic product is accurately aligned with the die cavity of the punching mechanism. During the adjustment process of the mechanical mechanism, multi-directional and multi-angle sensors can also be combined for detection to achieve detection and adjustment, ensuring that the plastic product can be accurately aligned with the punching die during the punching process, improving the punching accuracy and product quality.

[0118] In some embodiments, before continuously extruding the hollow and hot-melt parison 101, it further includes: introducing sterile gas into the support channel 102.

[0119] In practical applications, before continuously extruding the hollow and hot-melt parison 101, sterile gas is introduced into the support channel 102. The sterile gas can be introduced from the start of equipment startup and continuously introduced during the operation of the equipment to provide sterile protection for the filling needle 2.

[0120] Using sterile gas (usually compressed air that has been sterilized and filtered) to provide internal support for the parison 101, preventing the parison 101 from collapsing during movement and forming, and maintaining the complete shape of the parison 101; at the same time, the sterile gas forms a sterile chamber above the support channel 102 where the filling needle 2 extends, wrapping a part of the external environment of the filling needle 2, effectively isolating external contamination, and achieving sterile protection for the filling needle 2.

[0121] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other.

[0122] The plastic product forming device and method provided by the present invention have been introduced in detail above. Specific examples are used herein to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and modifications can still be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A plastic product forming device, characterized in that: The invention comprises an extrusion mechanism (1) having an extrusion die head, a filling mechanism having a filling needle (2), a clamp mechanism (3), and a molding die (4) having a head die (401) and a main die (402). The extrusion die head is provided with a support channel (102), the filling needle (2) is connected to the support channel (102), the filling needle (2) comprises a liquid inlet channel (202) arranged at a central position, a gas channel (201) arranged at the periphery of the liquid inlet channel (202), a cooling water inlet channel (203) and a cooling water return channel (204), the liquid outlet of the liquid inlet channel (202) and the gas outlet of the gas channel (201) are arranged at the lower end of the filling needle (2), and the cooling water inlet channel (203) and the cooling water return channel (204) are connected at the lower end to form a cooling circuit.

2. The plastic product forming device according to claim 1, characterized in that: The gas channel (201), the cooling water inlet channel (203), and the cooling water return channel (204) are arranged in sequence from the inside to the outside; the liquid inlet of the liquid inlet channel (202) is arranged on the top surface of the filling needle (2); the air inlet of the gas channel (201), the water inlet of the cooling water inlet channel (203), and the water return port of the cooling water return channel (204) are arranged on the side wall of the filling needle (2) and are arranged in sequence from high to low; the liquid outlet of the liquid inlet channel (202) is located below the air outlet of the gas channel (201).

3. The plastic product forming device according to claim 2, characterized in that: The side wall of the filling needle (2) has a gradually tapering slope at the lower end, and when the filling needle (2) is inserted into the parison (101), the slope of the filling needle (2) intersects and contacts with the die opening of the main die (402).

4. The plastic product forming device according to claim 1, characterized in that: An annular gap (103) is formed between the support channel (102) and the outer wall of the filling needle (2), sterile gas is introduced into the support channel (102), the sterile gas is ejected from the upper end of the annular gap (103) to form a sterile chamber, and the sterile gas moves downward along the annular gap (103) and enters the parison (101).

5. The plastic product forming device according to claim 1, characterized in that: The invention also comprises a punching mechanism (6), wherein the punching mechanism (6) comprises a die pressing plate (601), a punch pressing plate (602), a punching die (603) and a punching punch (604), wherein the die pressing plate (601) and the punch pressing plate (602) are respectively mounted on the bottom surfaces of the left and right molds of the main mold (402), the punching die (603) is fixedly connected to the die pressing plate (601), and the punching punch (604) can move laterally relative to the punch pressing plate (602) so as to engage in punching with the punching die (603).

6. The plastic product forming device according to claim 5, characterized in that: It also includes a conveying mechanism (7) disposed below the punching die (603), the conveying mechanism (7) including a conveying belt (701) and a guardrail (702); It also includes a blanking channel connecting the conveying mechanism (7) and the punching mechanism (6), the blanking channel including an inclined slide (607) connected to the end of the mold cavity of the punching die (603) and a vertical slide arranged above the conveying mechanism (7), a feed port being provided at the upper end of the vertical slide, the plastic product sliding down the inclined slide (607) sliding into the feed port of the vertical slide, the vertical slide and the projection of the guardrail (702) on the conveyor belt (701) coincide with each other.

7. The plastic product forming device according to claim 5, characterized in that: The concave die pressing plate (601) and / or the convex die pressing plate (602) are provided with a water cooling channel (608), and a cooling liquid flows into the water cooling channel (608).

8. A method for forming a plastic product using the plastic product forming device according to any one of claims 1 to 7, characterized in that: Includes steps: Continuously extruding a hollow hot melt parison (101); The preform (101) is sealed, and the preform (101) is pulled tight and moved downward until it moves to the mold closing position of the main mold (402); The main mold (402) is closed, the filling needle (2) is moved downward, the filling needle (2) is fitted with the mold opening of the main mold (402) to form a seal, and high-pressure gas is introduced into the gas channel (201) of the filling needle (2) to form a plastic product (501); Opening the gas channel (201), discharging the high-pressure gas in the preform (101), and injecting liquid medicine into the liquid inlet channel (202) of the filling needle (2); The filling needle (2) is moved upward, and the head mold (401) is closed to seal the plastic product (501); The head mold (401) clamps the product chain (5), and the main mold (402) and the head mold (401) are opened.

9. The plastic product forming method according to claim 8, characterized in that: The punching mechanism (6) is installed on the bottom surface of the main mold (402), and after the molding mold (4) is opened, it also includes: The upper clamp (301) is opened, and the lower clamp (302) pulls the product chain (5) to move to the punching station. The punching mechanism (6) follows the main mold (402) to close the mold to press the product chain (5), and punches the plastic product off the product chain (5).

10. The plastic product forming method according to claim 8, characterized in that: Before continuously extruding the hollow hot-melt parison (101), the method further includes: introducing sterile gas into the supporting channel (102).

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