Method and device for connecting a plastic bottle neck to a bottle body

Abstract

The application provides a plastic bottle mouth and bottle body connecting device, and relates to the field of plastic processing. The plastic bottle mouth and bottle body connecting device comprises a bottle mouth and a plastic film constituting a bottle body. The bottom end of the bottle mouth forms a connecting plane for connection. The plastic film is provided with a notch with a size smaller than the connecting plane. A preheating mechanism is used for preheating the connecting plane and the edge of the notch of the plastic film. The plastic bottle mouth and bottle body connecting device is characterized in that: the bottle mouth provided with the connecting plane is manufactured, the plastic film provided with the notch is manufactured, the connecting plane is covered at the notch, hot melt welding is performed through the hot melt mechanism, the bottle mouth and the plastic film are integrated, then the connecting plane is extruded into a three-dimensional shape through the shaping module, the plastic film is hot plasticized into a bottle body with a shape through the hot plastic module, the sealing edge of the plastic film is sealed by the sealing mechanism, the connection between the bottle mouth and the bottle body is completed, and the problem of inconvenient connection between the bottle mouth and the bottle body in the prior art is solved.

Description

Technical Field

[0001] This invention relates to the field of plastic processing, specifically to a device for connecting the mouth and body of a plastic bottle. Background Technology

[0002] The spout pouch mainly consists of two parts: the spout and the stand-up pouch. The stand-up pouch is similar in structure to a regular four-seal stand-up pouch, with a horizontal support structure at the bottom, allowing it to stand upright. The spout is similar to a bottle opening with a straw attached, fitting snugly to the stand-up pouch. The heat-sealing process between the spout and the pouch body provides excellent sealing, effectively preventing leakage, moisture, and spoilage of the contents. It can also be resealed for convenient reuse.

[0003] The existing patent CN211892199U describes a rotary welding machine for packaging bag nozzles. It includes a station turntable that rotates circumferentially via a divider and a bag compartment suspended on the turntable. The bottom of the turntable has vertically movable suction cups distributed circumferentially. The turntable also has circumferentially spaced suction cup holes for the suction cups to pass through vertically. The bottom of the bag compartment has a bag outlet hole with an outer contour smaller than the bottom of the compartment, and the outlet hole corresponds to the positions of the suction cups and the suction cup holes. This welding machine has a simple structure, allows for convenient and direct bag handling, and features smooth and cyclical station switching, making it highly suitable for fully automated production of packaging bag nozzle welding. It can completely replace manual welding, saving unnecessary human resources. In the welding process of this technical solution, as described in its instruction manual, "to insert the suction nozzle, the bag opening with the corners cut off first needs to be opened. For this purpose, a bag-opening suction cup 53 is fixed above the bag opening using a linear cylinder, corresponding vertically to the front suction cup 32, sucking the bag opening open from both above and below, and aligning the bag opening with the heat-pressing groove 52. The heat-pressing groove 52, located in front of the suction nozzle clamp 51, also includes an upper heat-pressing groove 521 and a lower heat-pressing groove 522 that are electrically heated. When the linear cylinder extends and retracts to open them relative to each other, the suction nozzle clamp 51 is driven forward by a horizontal linear cylinder to send the suction nozzle into the bag opening located in the middle of the heat-pressing groove 52. Then, the linear cylinder drives the upper heat-pressing groove 521 and..." The lower hot-pressing slot 522 moves up and down synchronously to achieve the initial welding of the nozzle and the bag opening. This synchronous movement ensures that the positions of the nozzle and the bag opening do not change, guaranteeing the welding effect. To further improve the welding effect, two additional welding processes are required. Therefore, two more sets of hot-pressing slots 52 are repeatedly installed at the next two workstations. Because the nozzle has an arc-shaped weld joint, welding it to the packaging bag is relatively difficult. After the initial welding, a second welding is necessary to ensure its seal. Furthermore, in this technical solution, the packaging bag is pre-thermoplasticized, making it prone to heat adhesion during welding. This adhesion, if inside the packaging bag, is not easily detected by external observation. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a device for connecting the mouth of a plastic bottle to the bottle body, which solves the problem of inconvenient welding of the nozzle to the bottle body mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a plastic bottle mouth and bottle body connection device, comprising a bottle mouth and a plastic film constituting the bottle body, wherein the bottom end of the bottle mouth forms a connection plane for connection, the plastic film has a notch smaller than the connection plane, a preheating mechanism for preheating the connection plane and the edge of the notch in the plastic film, a heat fusion mechanism for heat fusion welding the connection plane and the plastic film, and a sealing mechanism for sealing the edge of the plastic film after welding the bottle mouth to form the bottle body.

[0006] Preferably, the plastic film is composed of multiple layers of plastic with different functions, and the multiple plastic layers are bonded together as a whole.

[0007] Preferably, during the bonding process, a notch with a diameter larger than the inner ring of the bottle opening and smaller than the connecting plane is provided on the outermost plastic layer, and the notch diameter of the inner plastic layer is larger than the notch diameter of the outer plastic layer. After the bottle opening is fitted into the middle of the notch of the outer plastic layer, the inner plastic layer and the outer plastic layer are bonded into a whole.

[0008] Preferably, the plastic film is composed of multiple layers of plastic layers with different functions. The multiple plastic layers are not bonded at the gap. The outer plastic layer has a fracture groove at the gap. A bending mechanism is provided to bend the outer plastic layer and place the preheated connecting plane on the exposed plastic layer surface. The bending mechanism resets the outer plastic layer, and the hot-melt mechanism heat-melts the connecting plane and the multiple plastic layers together.

[0009] Preferably, it also includes a shaping module for extruding and shaping the connecting plane and the plastic film.

[0010] Preferably, the connecting plane is provided with magnetic metal, and the heating parts in both the preheating mechanism and the hot melting mechanism employ inductors that generate heat in the magnetic metal.

[0011] Preferably, the connecting plane and the plastic film are heated a second time using a preheating mechanism before extrusion and shaping.

[0012] Preferably, it also includes a thermoplastic module for heating and shaping the plastic film to form a sealing edge, the thermoplastic module being positioned in front of the sealing mechanism process.

[0013] Preferably, when the sealing mechanism seals the edge of the plastic film, it leaves one side open for secondary sealing.

[0014] Preferably, the hot-melting mechanism includes an extrusion section, which consists of two parts, one above the other, with hot-pressing protrusions and one hot-pressing depressions offset on the side of the two extrusion sections that are close to each other.

[0015] Preferably, each thermoplastic module is provided with a positioning post that fits onto the inner ring of the bottle opening.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. This plastic bottle mouth and bottle body connecting device manufactures a bottle mouth with a connecting plane and a plastic film with a notch. The connecting plane is covered at the notch, and the bottle mouth and plastic film are heat-fused and welded together by a heat-melting mechanism. Then, the connecting plane is extruded into a three-dimensional shape by a shaping module, and the plastic film is thermoformed into a bottle body with a shape by a thermoforming module. The sealing edge formed by the plastic film is sealed by a sealing mechanism, thus completing the connection between the bottle mouth and the bottle body and solving the problem of inconvenient connection between the bottle mouth and the bottle body in the prior art.

[0018] 2. The plastic bottle mouth and bottle body connection device consists of multiple layers of plastic film with different functions. The multiple plastic layers are not bonded at the notch. The outer plastic layer has a fracture groove at the notch. The outer plastic layer is bent and placed on the exposed plastic layer surface after the preheated connection plane is placed. Then the plastic film and the connection plane are welded. This setting can ensure the connection strength between the bottle mouth and the bottle body.

[0019] 3. The plastic bottle mouth and bottle body connection device has two extrusion parts, one above the other. The two extrusion parts are offset on the side that is close to each other, and hot-pressing protrusions and hot-pressing depressions are provided. By setting hot-pressing protrusions and hot-pressing depressions, the contact surface during the hot melting process can be increased, thereby increasing the connection strength.

[0020] 4. The plastic bottle mouth and bottle body connection device is a thermoplastic module that heats and shapes the plastic film to form a sealing edge. The thermoplastic module is set in front of the sealing mechanism process. The thermoplastic module is shaped according to the requirements of plastic film forming. With this setting, a whole piece of plastic film can be used for processing when producing polygonal packaging, thereby reducing welding edges.

[0021] 5. The plastic bottle mouth and bottle body connection device has a magnetic metal on the connection plane. The magnetic metal can be a heating wire pre-embedded in the connection plane, or it can be metal powder mixed into the adhesive used to bond the plastic film. The heating parts in the preheating mechanism and the hot melt mechanism both use inductors that generate heat from the magnetic metal. This setting can reduce the impact on the plastic film by heating from the inside out during the processing. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the bottle opening connection of the present invention;

[0023] Figure 2 This is a schematic diagram of the thermoplastic module connection of the present invention;

[0024] Figure 3 This is a schematic diagram of the fracture groove connection of the present invention;

[0025] Figure 4 This is a schematic diagram of the bending mechanism connection of the present invention;

[0026] Figure 5 This is a schematic diagram of the connection of the standardized module of the present invention;

[0027] Figure 6 This is a schematic diagram of the connection of the adsorption part of the present invention;

[0028] Figure 7 This is a schematic diagram of the connection of the preheating mechanism of the present invention;

[0029] Figure 8 This is a schematic diagram of the hot-melt mechanism connection of the present invention;

[0030] Figure 9 This is a half-sectional schematic diagram of the extrusion section of the present invention;

[0031] Figure 10 This is a schematic diagram of the sealing mechanism connection of the present invention;

[0032] Figure 11 This is a schematic diagram showing the connection between the plastic film and the bottle opening.

[0033] In the diagram: 1. Bottle mouth; 2. Plastic film; 3. Connecting plane; 4. Notch; 5. Preheating mechanism; 6. Hot-melt mechanism; 14. Extrusion section; 15. Hot-pressed protrusion; 16. Hot-pressed indentation; 7. Sealing mechanism; 8. Fracture groove; 9. Bending mechanism; 11. Magnetic metal; 12. Sensor; 122. Flow channel; 10. Shaping module; 101. Pressing part; 102. Extrusion block; 13. Thermoplastic module; 131. Collar; 17. Positioning post; 19. Transfer mechanism; 191. Clamping part; 192. Adsorption part. Detailed Implementation

[0034] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0035] It should be noted that all directional indications in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0036] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0037] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0038] like Figure 1-11 As shown, a plastic bottle mouth and bottle body connection device includes a bottle mouth 1 and a plastic film 2 constituting the bottle body. The bottom end of the bottle mouth 1 forms a connection plane 3 for connection, and the plastic film 2 has a notch 4 with a size smaller than the connection plane 3.

[0039] The preheating mechanism 5 is used to preheat the edge of the connecting plane 3 and the notch 4 of the plastic film 2. The preheating mechanism 5 is divided into a part for preheating the plastic film 2 and a part for connecting the connecting plane 3. The preheating mechanism 5 is divided into upper and lower sides, which preheat the mechanism from both sides. Preheating is a necessary pre-welding method for hot melt welding. The material to be melted reaches the processing temperature by uniform and slow heating.

[0040] The part that preheats the plastic film 2 is a heating plate covering the edge of the notch 4, and the part that heats the connecting plane 3 is a wrapping heating ring. Both the heating plate and the heating ring are divided into upper and lower groups. The lower one is fixed, and the upper part can move up and down. The part to be heated is placed between the upper and lower groups. After heating is completed, the upper part moves upward and the part to be heated is removed. Then, it is spliced ​​at the hot melt mechanism 6.

[0041] The hot-melt mechanism 6 is used to perform hot-melt welding on the connecting plane 3 and the plastic film 2. The hot-melt mechanism 6 includes a heating part and an extrusion part 14. The heating part is an integral heating part that covers the connecting plane 3 and the notch 4. It is sleeved on the outer surface of the bottle mouth 1 from top to bottom to heat the connecting plane 3 and the plastic film 2 from one side. The extrusion part 14 is divided into upper and lower parts. The two extrusion parts 14 are offset on the side that is close to each other, and hot-pressing protrusions 15 and hot-pressing recesses 16 are provided. The lower extrusion part 14 is fixed, and the upper extrusion part 14 replaces the position of the heating part. When rotated to the working position, the extrusion is performed from top to bottom to complete the hot-melt process.

[0042] The plastic film 2 after heat melting is still flat. After folding, the edges are aligned to form a seal. A simple folding method includes symmetrical folding with the bottle mouth 1 as the center to form two symmetrical seals and a bottom seal. First, seal the two symmetrical seals, and then seal the bottom seal. The sealing mechanism 7 is used to seal the edges of the plastic film 2 after welding the bottle mouth 1 to form the bottle body. The sealing method used is one of ultrasonic sealing machine, adhesive sealing or heat melting sealing.

[0043] The plastic film 2 is composed of multiple layers of plastic with different functions. The multiple plastic layers are bonded together as a whole. This solution only limits the material of the plastic film 2. By limiting the material, different storage effects can be achieved. For example, adding a light-blocking layer in the middle can reduce light transmission and can be used to store light-sensitive materials. Setting an antibacterial layer in the inner layer can improve the storage time of the stored materials.

[0044] Based on the previous embodiment, during the bonding process of the plastic film 2, a notch 4 with a diameter larger than the inner circle of the bottle mouth 1 and smaller than the connecting plane is set on the outermost plastic layer. The diameter of the notch 4 on the inner plastic layer is larger than the diameter of the notch 4 on the outer plastic layer. After the bottle mouth 1 is fitted into the middle of the notch 4 on the outer plastic layer, the inner plastic layer and the outer plastic layer are bonded into a whole. With this setting, the bottle mouth 1 and the plastic film 2 can be connected together during the production of the plastic film 2, and the connecting plane 3 is sealed between the multiple layers of plastic film 2. With this setting, the connection steps between the bottle body and the bottle mouth 1 can be reduced, and the multiple layers of plastic can be glued and rolled later.

[0045] Based on the previous embodiment, the plastic film 2 is composed of multiple layers of plastic layers with different functions. At least one layer of the multiple plastic layers is not bonded at the notch 4 to form two parts. The outer plastic layer has a fracture groove 8 at the notch 4. A bending mechanism 9 is provided. The bending mechanism 9 includes a mechanism for adsorbing the plastic film 2, such as a suction cup or electrostatic adsorption. Then, the plastic film 2 with the opening is rotated by a rotating unit to bend the outer plastic layer. After the preheated connecting plane 3 is placed on the exposed plastic layer surface, the bending mechanism 9 resets the outer plastic layer. The connecting plane 3 is provided with a magnetic metal 11. The magnetic metal 11 can be a heating wire pre-embedded in the connecting plane 3, or it can be metal powder mixed into the adhesive used to bond the plastic film 2. The heating parts in the preheating mechanism 5 and the hot melt mechanism 6 both use a sensor 12 to generate heat from the magnetic metal 11. In this embodiment, the heating parts of the preheating mechanism 5 and the hot-melt mechanism 6 are combined into one, and the lower extrusion part 14 is modified to have heating capability while maintaining the hot-pressing protrusion 15 and hot-pressing depression 16. The hot-melt mechanism 6 heat-melts the connecting plane 3 and the multiple plastic layers together. This arrangement ensures a thorough connection between the plastic film 2 and the bottle mouth 1, preventing air leakage. During preheating and hot-melt processes, the upper extrusion part 14 does not contact the heated material, while the lower extrusion part 14 does. The self-heating power of the lower extrusion part 14 is less than that of the upper extrusion part 14. After heating is complete, the extrusion part 14 moves downward, causing the heated material to adhere and cool and solidify through the flow channel 122 within the extrusion part 14.

[0046] Before extrusion molding, the connecting plane 3 and the plastic film 2 are subjected to secondary heating using a preheating mechanism 5. Since cooling has already occurred during the connection process, the extrusion molding temperature does not reach the standard. The extrusion molding temperature for PET plastic is approximately 80°C, while the optimal temperature for PE film is approximately 220°C. The melting temperature of PET material is approximately 250°C, therefore, secondary heating during heat deformation will not affect the sealing of the connection. In this embodiment, electromagnetic heating is used, which heats from the inside out, thereby allowing heating of the bottle mouth 1 and reducing heating of the bottle body.

[0047] It also includes a shaping module 10 for extruding and shaping the connecting plane 3 and the plastic film 2. The shaping module 10 includes a pressing part 101 for pressing the edge of the connecting plane 3 and an extrusion block 102 that is sleeved on the outside of the connecting plane 3 for expansion and contraction. The extrusion block 102 is designed into arc-shaped blocks of different shapes according to design requirements. The connecting plane 3 becomes a three-dimensional shape by extrusion after heating.

[0048] It also includes a thermoplastic module 13 for heating and shaping the plastic film 2 to form a sealing edge. The thermoplastic module 13 is set in front of the sealing mechanism 7 process. The thermoplastic module 13 is shaped according to the forming requirements of the plastic film 2, and heating wires are set at the edge to soften the plastic film 2. The thermoplastic module 13 is fixedly set, and a collar 131 that moves up and down is set above it to wrap the thermoplastic module 13. When the plastic film 2 is sleeved on the outside of the thermoplastic module 13, it moves downward through the collar 131, so that the plastic film 2 can be attached to the thermoplastic module 13.

[0049] When the sealing mechanism 7 seals the sealing edge of the plastic film 2, it leaves one side for secondary sealing. Before the secondary sealing, the packaged goods can be filled through the unsealed part. Compared with filling from the bottle mouth 1, the unsealed part has a larger cross section and the filling speed is faster.

[0050] Each thermoplastic module 13 is equipped with a positioning post 17 that fits into the inner ring of the bottle mouth 1. The positioning post 17 serves to limit the movement and prevent the plastic film 2 from falling off.

[0051] Throughout the process, a transport mechanism 19 is required. The transport mechanism 19 includes a clamping part 191 that clamps the bottle mouth 1 from both sides, and an adsorption part 192 that adsorbs the four corners of the plastic film 2 from above. Both the clamping part 191 and the adsorption part 192 can extend and retract vertically and move to the designated position according to the process route. In the figure, a track-driven mechanism is used, but in actual use, a rotating disc can be used to change the work position.

[0052] In use, a bottle mouth 1 with a connecting plane 3 is manufactured, and a plastic film 2 with a notch 4 is manufactured. The connecting plane 3 is covered at the notch 4, and the bottle mouth 1 and the plastic film 2 are heat-fused and welded by the hot-melt mechanism 6, so that the bottle mouth 1 and the plastic film 2 become one piece. Then, the connecting plane 3 is extruded into a three-dimensional shape by the shaping module 10, and the plastic film 2 is thermoformed into a bottle body with a shape by the thermoforming module 13. The sealing edge formed by the plastic film 2 is sealed by the sealing mechanism 7, thus completing the connection between the bottle mouth 1 and the bottle body, solving the problem of inconvenient connection between the bottle mouth 1 and the bottle body in the prior art.

[0053] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0054] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0055] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for connecting the mouth of a plastic bottle to the body of the bottle, characterized in that, Includes the following steps: Preparation steps: Provide a bottle mouth (1) and a plastic film (2) for forming the bottle body. Make a notch (4) on the plastic film (2) with a size smaller than the bottom connecting plane (3) of the bottle mouth (1), so that the connecting plane (3) is set to correspond to the edge of the notch in the plastic film (2); Preheating step: The preheating mechanism (5) is used to preheat the connecting plane (3) of the bottle mouth (1) and the notch edge of the plastic film (2) so that the connecting plane (3) and the notch edge of the plastic film (2) reach the preset heat melting temperature. Hot melt welding steps: Using a hot melt mechanism (6), the preheated connecting plane (3) and the notch edge of the plastic film (2) are hot melt welded together to make the bottle mouth (1) and the plastic film (2) firmly connected; Sealing and forming steps: Using a sealing mechanism (7), the edge of the plastic film (2) with the bottle mouth (1) welded on is sealed, so that the plastic film (2) is formed into a complete bottle body, and the connection between the bottle mouth and the bottle body is completed.

2. A plastic bottle neck and bottle body connection device, used in the method of claim 1, comprising a bottle neck (1) and a plastic film (2) constituting the bottle body, characterized in that: The bottom end of the bottle mouth (1) forms a connecting plane (3) for connection, and the plastic film (2) has a notch (4) with a size smaller than the connecting plane (3). A preheating mechanism (5) is used to preheat the edge of the notch between the connecting plane (3) and the plastic film (2); A hot melt mechanism (6) is used to perform hot melt welding on the connecting plane (3) and the plastic film (2); The sealing mechanism (7) is used to seal the edge of the plastic film (2) after welding the bottle mouth (1) to form the bottle body; The plastic film (2) is composed of multiple plastic layers with different functions. The multiple plastic layers are not bonded at the gap. The outer plastic layer has a fracture groove (8) at the gap (4). A bending mechanism (9) is set up to bend the outer plastic layer and place the preheated connecting plane (3) on the exposed plastic layer surface. The bending mechanism (9) resets the outer plastic layer. The hot melt mechanism (6) heat melts the connecting plane (3) and the multiple plastic layers together.

3. The plastic bottle mouth and bottle body connection device according to claim 2, characterized in that: The plastic film (2) is composed of multiple layers of plastic layers with different functions, and the multiple plastic layers are bonded together as a whole.

4. The plastic bottle mouth and bottle body connection device according to claim 3, characterized in that: During the bonding process, the plastic film (2) has a notch (4) with a diameter larger than that of the inner circle of the bottle mouth (1) and smaller than that of the connecting plane on the outermost plastic layer. The notch (4) of the inner plastic layer has a diameter larger than that of the notch (4) of the outer plastic layer. After the bottle mouth (1) is fitted into the middle of the notch (4) of the outer plastic layer, the inner plastic layer and the outer plastic layer are bonded together as a whole.

5. A plastic bottle neck and bottle body connecting device according to any one of claims 2-4, characterized in that: It also includes a shaping module (10) for extruding and shaping the connecting plane (3) and the plastic film (2).

6. The plastic bottle mouth and bottle body connection device according to claim 5, characterized in that: The connecting plane (3) is provided with magnetic metal (11), and the heating parts in the preheating mechanism (5) and the hot melting mechanism (6) are both made of inductors (12) that generate heat in the magnetic metal (11).

7. The plastic bottle neck and bottle body connection device according to claim 6, characterized in that: Before extrusion and shaping, the connecting plane (3) and the plastic film (2) are heated a second time using a preheating mechanism (5).

8. The plastic bottle neck and bottle body connection device according to claim 7, characterized in that: It also includes a thermoplastic module (13) for heating and shaping the plastic film (2) to form a sealing edge, the thermoplastic module (13) being positioned in front of the sealing mechanism (7) process.

9. The plastic bottle mouth and bottle body connection device according to claim 8, characterized in that: When the sealing mechanism (7) seals the sealing edge of the plastic film (2), it leaves one side open for secondary sealing.

10. The plastic bottle mouth and bottle body connection device according to claim 9, characterized in that: The hot melt mechanism (6) includes an extrusion part (14), which is divided into two parts, upper and lower. The two extrusion parts (14) are offset on one side of each other, with a hot-pressing protrusion (15) and a hot-pressing depression (16). The thermoplastic module (13) is provided with a positioning post (17) that is sleeved on the inner ring of the bottle mouth (1).

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