A polyethylene terephthalate film material melt blending production system and method thereof

Abstract

The present application belongs to the technical field of film production, and particularly relates to a polyethylene terephthalate film material melting blending production system and a method thereof. The production system comprises a rack and a hot air supply unit, and a barrel is installed on the rack, and a screw rod is arranged in the barrel, and the screw rod is driven to rotate by a driving unit. A barrel body is arranged on the rack, and a first drying cavity, a second drying cavity and a mixing cavity are formed in the barrel body from top to bottom by a partition plate. A stirring mechanism and a screening mechanism are installed in the barrel body. The screening mechanism screens the granular material, so that the debris is screened and directly taken out of the barrel body by the hot air, thereby effectively avoiding the mixing of the debris into the molten material and affecting the film quality.

Description

Technical Field

[0001] This invention belongs to the field of thin film production technology, and particularly relates to a melt blending production system and method for polyethylene terephthalate thin film materials. Background Technology

[0002] Polyethylene terephthalate (PET) film is widely used as an insulating material for electrical equipment due to its excellent mechanical properties, heat resistance, dimensional stability, and electrical insulation properties. However, conventional PET film has a high surface resistivity, and its relative tracking index (CTI) is generally only 300-400V, resulting in limited insulation withstand voltage performance, which is difficult to meet the requirements of high-end electrical insulation applications. Currently, the preparation of high CTI (600W) polyester film usually involves directly compounding leakage-resistant inorganic powder fillers into the PET substrate, followed by slicing and drying, material premixing, screw melt extrusion, and casting and stretching. However, direct mixing of powders can easily lead to poor dispersion uniformity in the PET matrix, causing agglomeration and thus reducing product quality.

[0003] To address the shortcomings of direct powder mixing, the industry has gradually adopted the method of drying, premixing, and melt-blending PET matrix with pre-granulated modified masterbatch. However, during drying and premixing, powdery debris is easily generated between particles. This powdery debris will follow into the screw extruder to participate in melt blending. In the subsequent melt blending, the melting speed is faster, which can easily cause local filler enrichment and the formation of micro-agglomerates. These micro-agglomerates cannot be completely dispersed by screw shearing and will still affect the quality of the film. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned technical problems by providing a melt blending production system and method for polyethylene terephthalate (PET) film materials. This system effectively removes powdery debris generated during the drying and premixing of particles, preventing it from entering the screw extruder for melt blending and ensuring the quality of the film product.

[0005] In view of this, the present invention provides a melt blending production system for polyethylene terephthalate film materials, comprising: The frame is equipped with a material cylinder, and a screw is installed inside the material cylinder, with a drive unit connected to one end of the screw; The barrel is mounted on the frame and is equipped with a partition to form a first drying chamber, a second drying chamber and a mixing chamber from top to bottom inside the barrel. A first conveying channel is provided between the first drying chamber and the mixing chamber, a second conveying channel is provided between the second drying chamber and the mixing chamber, and a third conveying channel is provided between the mixing chamber and the barrel. The stirring mechanism, installed inside the tank, is used to agitate materials during drying and premixing. A hot air supply unit, connected to the barrel, is used to provide dry hot air to the barrel; The screening mechanism is installed in the first drying chamber, the second drying chamber and the mixing chamber respectively, and is used to screen the debris in the material; The barrel has an air inlet and an air outlet. Hot air from the hot air supply unit is introduced through the air inlet, passes through the screening mechanism, and is discharged through the air outlet, carrying the screened debris out of the barrel. The first conveying channel, the second conveying channel, and the third conveying channel are all equipped with opening and closing devices.

[0006] In the above technical solution, further: The screening mechanism includes a screen, a vibrating component installed below the screen, and an opening and closing component installed on the stirring mechanism; The opening and closing component is driven by the stirring mechanism and is used to intermittently open and close the vibrating component, as well as to lock or unlock the screen.

[0007] In the above technical solution, the vibration component further includes: The support column is installed on the partition and extends towards one side of the screen. The cylinder is slidably connected to the support column, with a spring between one end and the partition plate, and the other end connected to the screen. A ferromagnetic ring is fitted onto the support column and fixedly connected to it. An electromagnet ring is installed on the inner wall of the cylinder and is coaxially arranged with the ferromagnetic ring, located on the side of the ferromagnetic ring away from the screen. The opening and closing component is driven by the stirring mechanism to switch between the intermittent and continuous energization states of the electromagnet ring.

[0008] In the above technical solution, the stirring mechanism further includes: The stirring shaft is coaxially installed inside the tank, with one end extending out of the tank and equipped with a drive motor. The stirring rods are respectively installed in the first drying chamber, the second drying chamber, and the mixing chamber, and are connected to the stirring shaft; The stirring rod has an arc-shaped structure along the radial surface and is in clearance fit with the screen surface when the screen is locked by the opening and closing component.

[0009] In the above technical solution, the opening and closing components further include: The covers are installed in the first drying chamber, the second drying chamber, and the mixing chamber, respectively, and are located below the screen. An installation ring is fitted onto the stirring shaft, and a ratchet component is provided between the stirring shaft and rotatedly connected to the stirring shaft; The trigger plate is connected to the radial side of the mounting ring; 139 sets of electrode blocks are installed inside the cover, including two electrode blocks connected in series in the electromagnetic ring circuit, and a gap is formed between the two electrode blocks to match the trigger plate. In this system, static friction is generated between the trigger plate and the electrode block. When the ratchet is engaged, the trigger plate overcomes the static friction and rotates with the stirring shaft to intermittently contact the 139 sets of electrode blocks, which is used to intermittently turn the electromagnet on and off. When the ratchet is not engaged, the trigger plate cannot overcome the static friction and maintains continuous conduction between the two electrode blocks, which is used to continuously energize the electromagnet.

[0010] In the above technical solution, the ratchet component further includes: The pawls are provided at equal intervals around the circumference and are connected to the stirring shaft via a mounting bracket. A torsion spring is provided at the connection point with the mounting bracket. The inner wall of the mounting ring is provided with ratchet teeth that engage with the pawl.

[0011] In the above technical solution, further: The first conveying channel, the second conveying channel, and the third conveying channel all include an outgoing section and an incoming section, and the outgoing section and the incoming section form an angle greater than or equal to 90° and less than 180°. The opening and closing components are installed in the export segment, and both the export and import segments are set at an angle.

[0012] In the above technical solution, further: The opening and closing components include a piston head slidably connected within the outlet section, a piston rod connected to the piston head away from the barrel body, and a drive cylinder connected to the piston rod away from the piston head and used to drive the piston head to slide.

[0013] In the above technical solution, further: The barrel has a first feed hopper and a second feed hopper on its side, and the first feed hopper is connected to the first drying chamber, and the second feed hopper is connected to the second drying chamber.

[0014] This invention provides a production method for a polyethylene terephthalate (PET) film material melt blending production system, comprising the following steps: S1: The first conveyor channel, the second conveyor channel, and the third conveyor channel are closed; S2: Take polyethylene terephthalate chips and modified masterbatch in a preset ratio and pour them into the first drying chamber and the second drying chamber respectively. S3: Hot air at a preset temperature is supplied to the first drying chamber and the second drying chamber respectively through the hot air supply unit; S4: The stirring mechanism starts and drives the opening and closing component to intermittently open and close the vibrating component, causing the screen to jump and screen the debris in the material, so that the debris is discharged from the air outlet with the hot air. S5: After drying is complete, open the first and second conveying channels and reverse the stirring mechanism; S6: After the polyethylene terephthalate chips and modified masterbatch are both fed into the mixing chamber, the stirring mechanism switches to forward rotation to perform premixing; S7: During premixing, hot air at a preset temperature is supplied to the mixing chamber through the hot air supply unit. At the same time, the screening mechanism in the mixing chamber screens the debris, so that the debris is discharged from the air outlet along with the hot air. S8: After premixing is completed, open the third conveying channel to send the dried and premixed materials into the material cylinder for melt blending.

[0015] The beneficial effects of this invention are as follows: 1. The two independently designed drying chambers can be matched with the drying process conditions corresponding to polyethylene terephthalate chips and CTI modified masterbatch, respectively. Each chamber is equipped with a screening structure and a hot air conveying structure. Fine debris generated by the friction of particulate materials during the drying and mixing process can be separated by the screen and then carried out of the chamber directly by the hot air. The debris will not flow into the subsequent melt blending process and affect the polyester film product.

[0016] 2. By integrating the functions of polyethylene terephthalate (PET) chip drying, CTI modified masterbatch drying, material premixing, and debris screening into a single barrel, and setting up independent first drying chamber, second drying chamber, and mixing chamber, the space occupied by the production line is reduced. The first, second, and third conveying channels are all equipped with opening and closing devices, which can control the opening and closing of material conveying separately, ensuring the switching between drying and premixing modes. The overall structure of the equipment is simple.

[0017] 3. By rotating the stirring shaft in both directions and using a ratchet-type opening and closing assembly, the screen can be automatically switched between two working states: intermittent vibration screening and screen locking. During drying, the intermittent vibration of the screen not only ensures the drying effect but also facilitates the screening of fine debris, allowing hot air to directly carry it out of the container. During feeding, the screen locking ensures the stability of the feeding process and prevents the screen vibration from affecting the feeding. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a partial schematic diagram of the barrel body of the present invention; Figure 3 This is a top view of the barrel body of the present invention; Figure 4 This is the present invention. Figure 3 Sectional view at point AA; Figure 5 This is the present invention. Figure 4Enlarged view of point C in the middle; Figure 6 This is the present invention. Figure 4 Enlarged view at point D; Figure 7 This is the present invention. Figure 4 Sectional view at point BB; Figure 8 This is the present invention. Figure 7 Enlarged view at point E in the middle; The markings in the diagram represent: 1. Frame; 2. Cylinder; 3. Drive unit; 4. Barrel; 5. Baffle; 6. First drying chamber; 7. Second drying chamber; 8. Mixing chamber; 9. First conveying channel; 90. Outlet section; 91. Inlet section; 10. Second conveying channel; 11. Third conveying channel; 12. Stirring mechanism; 120. Stirring shaft; 121. Drive motor; 122. Stirring rod; 13. Screening mechanism; 130. Screen; 131. Support column ; 132. Cylinder; 133. Spring; 134. Ferromagnetic ring; 135. Electromagnetic ring; 136. Cover; 137. Mounting ring; 138. Trigger plate; 139. Electrode block; 14. Air inlet; 15. Air outlet; 16. Opening and closing component; 160. Piston head; 161. Piston rod; 162. Drive cylinder; 17. Ratchet component; 170. Pawl; 171. Mounting bracket; 172. Ratchet tooth; 18. First feed hopper; 19. Second feed hopper. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0020] Example 1:

[0021] This embodiment provides a melt blending production system for polyethylene terephthalate (PET) film materials, including: The frame 1 is equipped with a material cylinder 2, and a screw is installed inside the material cylinder 2, with a drive unit 3 connected to one end of the screw; The barrel 4 is installed on the frame 1 and is provided with a partition 5 to form a first drying chamber 6, a second drying chamber 7 and a mixing chamber 8 from top to bottom inside the barrel 4. A first conveying channel 9 is provided between the first drying chamber 6 and the mixing chamber 8, a second conveying channel 10 is provided between the second drying chamber 7 and the mixing chamber 8, and a third conveying channel 11 is provided between the mixing chamber 8 and the material cylinder 2. The stirring mechanism 12 is installed inside the barrel 4 and is used to stir the materials during drying and premixing. A hot air supply unit is connected to the barrel 4 and is used to provide dry hot air to the barrel 4; The screening mechanism 13 is installed in the first drying chamber 6, the second drying chamber 7 and the mixing chamber 8 respectively, and is used to screen the debris in the material; The barrel 4 has an air inlet 14 and an air outlet 15. The hot air from the hot air supply unit is introduced from the air inlet 14, passes through the screening mechanism 13 and is discharged from the air outlet 15, and the screened debris is carried out of the barrel 4. The first conveying channel 9, the second conveying channel 10 and the third conveying channel 11 are all equipped with opening and closing parts 16. Meanwhile, the hot air supply unit can use devices such as air blowers, electric heating devices, and filters, which are conventional structures of traditional hot air supply devices and are known to those skilled in the art from traditional hot air supply devices, so they will not be described in detail here. The drive unit 3 is the drive motor 121 of the screw extruder used to drive the screw to rotate. The production system also includes subsequent casting, biaxial stretching and shaping, slitting and winding equipment or devices, which are all traditional film production equipment or devices. These are known to those skilled in the art from traditional film production equipment or devices, and will not be described in detail here. It should be noted that the drying hot air temperature of the first drying chamber 6 is adapted to the drying temperature requirements of the material in the first drying chamber 6, and the drying hot air temperature of the second dryer is adapted to the drying temperature requirements of the material in the second drying chamber 7. The drying hot air temperature in the mixing chamber 8 is lower than the temperature in the first drying chamber 6 and the second drying chamber 7. Therefore, the hot air in the mixing chamber 8 mainly plays the role of secondary auxiliary drying and removing the debris generated in the mixing chamber 8.

[0022] As can be seen from this embodiment, when the CTI masterbatch and PET chips are dried separately, the screening mechanism 13 screens out the smaller debris generated when the stirring mechanism 12 agitates the granular material. Then, the hot air supplied by the hot air supply unit blows in from the air inlet 14 and out from the air outlet 15, carrying the debris out. During drying and premixing, the debris can be removed, preventing the debris from entering the subsequent melt blending and affecting the quality of the film product. The first drying chamber 6, the second drying chamber 7, and the mixing chamber 8 are arranged from top to bottom inside the barrel 4. The drying and premixing of various materials can be integrated into one barrel 4, which effectively simplifies the equipment and improves space utilization. Furthermore, the first drying chamber 6 and the second drying chamber 7 can dry PET chips and CTI modified masterbatch separately to adapt to different drying conditions and avoid the drying effect being affected by different drying conditions when drying together.

[0023] Example 2:

[0024] This embodiment provides a melt blending production system for polyethylene terephthalate (PET) film materials. In addition to the technical solutions of the above embodiments, it also has the following technical features: The screening mechanism 13 includes a screen 130, a vibration assembly installed below the screen 130, and an opening and closing assembly installed on the stirring mechanism 12; The opening and closing component is driven by the stirring mechanism 12 and is used to intermittently open and close the vibrating component, as well as to lock or unlock the screen 130. Meanwhile, the screen 130 can be formed by a metal mesh and a support, with the support providing structural strength to the screen 130.

[0025] As can be seen from this embodiment, the opening and closing component is driven by the stirring mechanism 12. When the stirring mechanism 12 rotates to turn the material, the vibration component can be started intermittently by the opening and closing component, so that the screen 130 vibrates. This makes it easier for the generated debris to fall off the screen 130 and be carried away by the hot air. When the stirring mechanism 12 reverses to feed the material, the screen 130 can be locked to prevent the screen 130 from jumping, thereby ensuring the effect and efficiency of feeding.

[0026] Example 3:

[0027] This embodiment provides a melt blending production system for polyethylene terephthalate (PET) film materials. In addition to the technical solutions described in the above embodiments, it also has the following technical features: the vibration component includes: The support column 131 is installed on the partition 5 and extends toward the screen 130; The cylinder 132 is slidably connected to the support column 131, and a spring 133 is provided between one end and the partition plate 5, and the other end is connected to the screen 130. A ferromagnetic ring 134 is sleeved on the support column 131 and fixedly connected to the support column 131; An electromagnet ring 135 is installed on the inner wall of the cylinder 132 and is coaxially arranged with the ferromagnetic ring 134, and is located on the side of the ferromagnetic ring 134 away from the screen 130. The opening and closing component is driven by the stirring mechanism 12 to switch between the intermittent energization state and the continuous energization state of the electromagnet ring 135. Meanwhile, the specific structure of the electromagnet ring 135 is a mature existing technology, which is known and applied by those skilled in the art from the traditional electromagnet structure, and will not be described in detail here.

[0028] As can be seen from this embodiment, by using the support column 131 and the cylinder 132, the up-and-down jumping of the screen 130 is guided. Furthermore, by setting the spring 133, under the intermittent adsorption and de-adsorption force between the electromagnet and the ferromagnetic ring 134, the screen 130 can jump up and down, thereby throwing the material up. This makes it easier for the debris to settle at the bottom and then be carried away by the hot air after passing through the screen 130, ensuring the screening effect of the debris. Moreover, the overall structure is simple, and it is only necessary to control the on and off of the electromagnet ring 135, making the control method convenient.

[0029] Example 4:

[0030] This embodiment provides a melt blending production system for polyethylene terephthalate (PET) film materials. In addition to the technical solutions described in the above embodiments, it also has the following technical features: the stirring mechanism 12 includes: A stirring shaft 120 is coaxially installed inside the barrel 4, and one end of the shaft extends out of the barrel 4 and is equipped with a drive motor 121. The stirring rod 122 is installed in the first drying chamber 6, the second drying chamber 7 and the mixing chamber 8 respectively, and is connected to the stirring shaft 120; The stirring rod 122 has an arc-shaped structure along the radial surface and is in clearance fit with the surface of the screen 130 when the screen 130 is locked by the opening and closing component. Meanwhile, the specific structure of the drive motor 121 is a mature existing technology, which can be selected and used by those skilled in the art from the traditional drive motor 121, and will not be described in detail here; The stirring rod 122 has chamfers on both sides along the direction of rotation.

[0031] As can be seen from this embodiment, the drive motor 121 drives the stirring shaft 120 and drives the stirring rod 122 to rotate with the stirring shaft 120, so that the stirring rod 122 disperses the material, making it easier for hot air to enter the material pile and improve the drying effect of the material. At the same time, in conjunction with the jumping screen 130, it can further ensure that the debris sinks to the bottom and that the debris is carried away by the hot air after passing through the screen 130. The stirring rod 122 is designed with an arc shape, which can push the particles towards the axis when the material is dispersed, thus avoiding the screen 130 being unbalanced and improving the smoothness and stability of the screen 130's movement. Conversely, when the material is fed, the particles can be pushed away from the axis, making it easier to push the material into the first conveying channel 9 and the second conveying channel 10, so that the material enters the mixing chamber 8. The chamfered opening prevents the particles from turning up, reducing jamming and squeezing of the particles.

[0032] Example 5:

[0033] This embodiment provides a melt blending production system for polyethylene terephthalate (PET) film materials. In addition to the technical solutions described in the above embodiments, it also has the following technical features: the opening and closing components include: The cover 136 is installed in the first drying chamber 6, the second drying chamber 7 and the mixing chamber 8 respectively, and is located below the screen 130; Mounting ring 137 is sleeved on stirring shaft 120, and ratchet part 17 is provided between stirring shaft 120 and rotatably connected to stirring shaft 120; The trigger piece 138 is connected to the radial side of the mounting ring 137; The electrode block 139 group is installed inside the cover 136 and includes two electrode blocks 139 connected in series in the circuit of the electromagnet ring 135, and a gap is formed between the two electrode blocks 139 to be adapted to the trigger piece 138. In this process, static friction is generated between the trigger piece 138 and the electrode block 139. When the ratchet 17 is engaged, the trigger piece 138 overcomes the static friction and rotates with the stirring shaft 120 to intermittently contact the electrode block 139 group, which is used to intermittently turn the electromagnet on and off. When the ratchet 17 is not engaged, the trigger piece 138 cannot overcome the static friction and maintains continuous conduction between the two electrode blocks 139, which is used to continuously energize the electromagnet. Meanwhile, the two electrode blocks 139 are connected in series in the electromagnet circuit. The specific structure is not shown in the accompanying drawings of this application. It is a conventional circuit arrangement and connection, which is obtained and applied by those skilled in the art from traditional series circuit arrangements, and will not be described in detail here.

[0034] As can be seen in this embodiment, by setting the mounting ring 137 and ratchet 17, the trigger plate 138 connected to the mounting ring 137 rotates unidirectionally as it follows the stirring shaft 120. With the ratchet 17 engaged, the rotation of the stirring shaft 120 drives the trigger plate 138 to rotate, causing it to intermittently pass through the electrode block 139 group, thus intermittently energizing the two electrode blocks 139 and intermittently switching the electromagnet ring 135 on and off. This, in turn, achieves intermittent adsorption of the screen 130. With the help of the spring 133, the screen 130 jumps, completing the process. The system screens the debris generated in pairs. When the ratchet 17 is not engaged, the reverse rotation of the stirring shaft 120 causes static friction between the trigger plate 138 and the two electrode blocks 139, ensuring that the trigger plate 138 is always in contact with the electrode blocks 139 and is energized. This ensures the adsorption and fixation of the screen 130. Then, under the action of the stirring rod 122, the granular material is pushed out. The system only requires forward and reverse rotation of a single drive motor 121, which is simple in structure, convenient in control, and can achieve continuous jumping or continuous locking of the screen 130, ensuring the efficiency of screening and feeding.

[0035] Example 6:

[0036] This embodiment provides a melt blending production system for polyethylene terephthalate film materials. In addition to the technical solutions described in the above embodiments, it also has the following technical features: the ratchet component 17 includes: The pawl 170 is provided with multiple pawls at equal intervals around its circumference and is connected to the stirring shaft 120 via a mounting bracket 171. A torsion spring is provided at the connection point with the mounting bracket 171. Among them, the inner wall of the mounting ring 137 is provided with ratchet teeth 172 that mesh with the pawl 170; Meanwhile, the torsion spring provided at the connection between the pawl 170 and the mounting bracket 171 is not shown in the accompanying drawings of this application. It is a conventional structure of the traditional ratchet component 17, which is known to those skilled in the art from the traditional ratchet component 17, and will not be described again here.

[0037] As can be seen in this embodiment, by employing a pawl 170 and a ratchet 172 that meshes with it on the inner wall of the mounting ring 137, the forward and reverse rotation of the stirring shaft 120 can be used to select whether the pawl 170 and the ratchet 172 are engaged, thereby controlling the rotation of the trigger plate 138. When engaged, the trigger plate 138 overcomes static friction and rotates accordingly. When not engaged, the trigger plate 138 cannot overcome static friction and maintains continuous power supply to the electromagnet ring 135, ensuring the locking of the screen 130. Furthermore, when the stirring rod 122 reverses and becomes stuck (i.e., during material feeding), the stirring rod 122 is switched back to its small angle. When the screen 130 is rotated forward, the contact between the trigger plate 138 and the two electrode blocks 139 is released, the screen 130 is released from locking, and the screen 130 falls to compress the spring 133 and generates a brief jump, effectively eliminating jamming. Therefore, it can be combined with the current detection technology of the prior art to realize the automatic elimination of jamming during discharge. For example, by monitoring the current of the drive motor 121, when the stirring rod 122 is jammed, it will be transmitted to the output shaft of the drive motor 121 through the stirring shaft 120, and the jamming current of the drive motor 121 will be detected. Then, the stirring rod 122 will be switched to rotate forward at a small angle to realize the automatic elimination of jamming during discharge. The mounting bracket 171 can improve the stability of the connection between the pawl 170 and the stirring shaft 120.

[0038] Example 7:

[0039] This embodiment provides a melt blending production system for polyethylene terephthalate (PET) film materials. In addition to the technical solutions of the above embodiments, it also has the following technical features: The first conveying channel 9, the second conveying channel 10, and the third conveying channel 11 each include an outgoing section 90 and an incoming section 91, and the outgoing section 90 and the incoming section 91 form an angle greater than or equal to 90° and less than 180°. The opening and closing component 16 is installed in the export section 90, and both the export section 90 and the import section 91 are tilted.

[0040] As can be seen from this embodiment, by setting both the outlet section 90 and the inlet section 91 to an angle greater than or equal to 90° and less than 180°, and by setting both the outlet section 90 and the inlet section 91 to be inclined, it is convenient for the particulate material to enter from the inclined outlet section 90 and enter the mixing chamber 8 through the inclined inlet section 91 under the push of the stirring rod 122. The particulate material can be automatically transported into the mixing chamber 8 by gravity, which ensures production efficiency and reduces manufacturing costs. Furthermore, the opening and closing element 16 is set in the outlet section 90 to prevent some particulate material from accumulating in the outlet section 90 during drying or premixing, thus avoiding affecting the drying or mixing effect of this section.

[0041] Example 8:

[0042] This embodiment provides a melt blending production system for polyethylene terephthalate (PET) film materials. In addition to the technical solutions of the above embodiments, it also has the following technical features: The opening and closing component 16 includes a piston head 160 slidably connected in the outlet section 90, a piston rod 161 connected to the piston head 160 away from the barrel 4, and a drive cylinder 162 connected to one end of the piston rod 161 away from the piston head 160 and used to drive the piston head 160 to slide. The drive cylinder 162 can be an electric push cylinder, a pneumatic push cylinder, or a hydraulic push cylinder, and the surface of the piston head 160 near the barrel 4 can be configured to have the same shape as the inner wall of the barrel 4.

[0043] As can be seen from this embodiment, by adopting the structure of piston head 160 and piston rod 161, it is convenient for piston head 160 to slide in outlet section 90 under the drive of drive cylinder 162. The surface of piston head 160 near barrel 4 can be set to have the same shape as the inner wall of barrel 4, thereby avoiding interference with the rotation of stirring rod 122. At the same time, it eliminates the problem of particulate material being embedded in the end of outlet section 90 near barrel 4, which would affect the drying and premixing effect of this part of the particulate material.

[0044] Example 9:

[0045] This embodiment provides a melt blending production system for polyethylene terephthalate (PET) film materials. In addition to the technical solutions of the above embodiments, it also has the following technical features: The barrel body 4 is provided with a first feed hopper 18 and a second feed hopper 19 on its side, and the first feed hopper 18 is connected to the first drying chamber 6, and the second feed hopper 19 is connected to the second drying chamber 7.

[0046] As can be seen from this embodiment, the arrangement of the first feed hopper 18 and the second feed hopper 19 facilitates the classified addition of PET chips and CTI modified masterbatch, improves the convenience of feeding, and makes it easier to add different particulate materials into the first drying chamber 6 and the second drying chamber 7 respectively.

[0047] Example 10:

[0048] This embodiment provides a production method for a polyethylene terephthalate (PET) film material melt blending production system, including the following steps: S1: First conveying channel 9, second conveying channel 10 and third conveying channel 11 are closed; S2: Take polyethylene terephthalate chips and modified masterbatch in a preset ratio and pour them into the first drying chamber 6 and the second drying chamber 7 respectively. S3: Hot air at a preset temperature is supplied to the first drying chamber 6 and the second drying chamber 7 respectively through the hot air supply unit; S4: The stirring mechanism 12 is started and drives the opening and closing component to intermittently open and close the vibrating component, causing the screen 130 to jump and screen the debris in the material, so that the debris is discharged from the air outlet 15 with the hot air. S5: After drying is completed, the first conveying channel 9 and the second conveying channel 10 are opened, and the stirring mechanism 12 is reversed; S6: After the polyethylene terephthalate chips and modified masterbatch are both conveyed to the mixing chamber 8, the stirring mechanism 12 switches to forward rotation to perform premixing; S7: During premixing, hot air at a preset temperature is supplied to the mixing chamber 8 through the hot air supply unit. At the same time, the screening mechanism 13 in the mixing chamber 8 screens the debris, so that the debris is discharged from the air outlet 15 along with the hot air. S8: After premixing is completed, the third conveying channel 11 is opened to send the dried and premixed material into the material cylinder 2 for melt blending.

[0049] As can be seen from this embodiment, the step-by-step process of partitioned closed drying, dynamic screening and impurity removal, subsequent feeding and mixing, and final feeding and melting is adapted to the differentiated drying process requirements of PET chips and CTI modified masterbatch, and avoids the problem of uneven drying caused by mixed drying. At the same time, by utilizing the coordinated control of the stirring forward and reverse rotation linkage screening mechanism 13 and the opening and closing of the conveying channel, the automatic switching of screening and impurity removal, smooth feeding and uniform premixing is realized. Throughout the process, hot air is used to remove material debris in real time, eliminating the potential impact of debris on subsequent melt blending from the source. Furthermore, it eliminates the need for multiple equipment to transfer materials, reducing material loss and external pollution, effectively improving the accuracy of material pretreatment and production efficiency, providing high-quality raw materials for subsequent melt blending and film forming, and ensuring the flatness, uniformity, and yield of the finished polyester film.

[0050] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A melt blending production system for polyethylene terephthalate (PET) film materials, characterized in that, include: The frame (1) is equipped with a material cylinder (2), and a screw is provided inside the material cylinder (2), and a drive unit (3) is connected to one end of the screw. The barrel (4) is installed on the frame (1) and is provided with a partition (5) to form a first drying chamber (6), a second drying chamber (7) and a mixing chamber (8) from top to bottom inside the barrel (4). A first conveying channel (9) is provided between the first drying chamber (6) and the mixing chamber (8), a second conveying channel (10) is provided between the second drying chamber (7) and the mixing chamber (8), and a third conveying channel (11) is provided between the mixing chamber (8) and the barrel (2). A stirring mechanism (12) is installed inside the barrel (4) for stirring materials during drying and premixing; A hot air supply unit is connected to the barrel (4) and is used to provide dry hot air to the barrel (4); The screening mechanism (13) is installed in the first drying chamber (6), the second drying chamber (7) and the mixing chamber (8) respectively, and is used to screen the debris in the material; The barrel (4) is provided with an air inlet (14) and an air outlet (15). The hot air from the hot air supply unit is introduced from the air inlet (14), passes through the screening mechanism (13), and is discharged from the air outlet (15), which carries the screened debris out of the barrel (4). The first conveying channel (9), the second conveying channel (10), and the third conveying channel (11) are all provided with opening and closing parts (16).

2. The polyethylene terephthalate film material melt blending production system according to claim 1, characterized in that: The screening mechanism (13) includes a screen (130), a vibration assembly installed below the screen (130), and an opening and closing assembly installed on the stirring mechanism (12); The opening and closing component is driven by the stirring mechanism (12) and is used to intermittently open and close the vibration component, as well as to lock or unlock the screen (130).

3. The polyethylene terephthalate film material melt blending production system according to claim 2, characterized in that, The vibration assembly includes: The support column (131) is mounted on the partition (5) and extends toward the screen (130); The cylinder (132) is slidably connected to the support column (131), and a spring (133) is provided between one end and the partition plate (5), and the other end is connected to the screen (130); A ferromagnetic ring (134) is sleeved on the support column (131) and fixedly connected to the support column (131); An electromagnet ring (135) is installed on the inner wall of the cylinder (132) and is coaxially arranged with the ferromagnetic ring (134), and is located on the side of the ferromagnetic ring (134) away from the screen (130); The opening and closing component is driven by the stirring mechanism (12) to switch between the intermittent energization state and the continuous energization state of the electromagnet ring (135).

4. The polyethylene terephthalate film material melt blending production system according to claim 3, characterized in that, The stirring mechanism (12) includes: A stirring shaft (120) is coaxially installed inside the barrel (4), and one end extends out of the barrel (4) and is equipped with a drive motor (121). The stirring rod (122) is installed in the first drying chamber (6), the second drying chamber (7) and the mixing chamber (8) respectively, and is connected to the stirring shaft (120); The stirring rod (122) has an arc-shaped structure on the radial surface and is in clearance fit with the surface of the screen (130) when the screen (130) is locked by the opening and closing assembly.

5. The polyethylene terephthalate film material melt blending production system according to claim 4, characterized in that, The opening / closing component includes: The cover (136) is installed in the first drying chamber (6), the second drying chamber (7) and the mixing chamber (8) respectively, and is located below the screen (130); A mounting ring (137) is fitted onto the stirring shaft (120), and a ratchet (17) is provided between the stirring shafts (120) and is rotatably connected to the stirring shafts (120); A trigger piece (138) is connected to the radial side of the mounting ring (137); The electrode block assembly is installed inside the cover (136) and includes two electrode blocks (139) connected in series in the circuit of the electromagnet ring (135), and a gap is formed between the two electrode blocks (139) to be adapted to the trigger piece (138). In this process, static friction is formed between the trigger piece (138) and the electrode block (139). When the ratchet (17) is engaged, the trigger piece (138) overcomes the static friction and rotates with the stirring shaft (120) to intermittently contact the electrode block (139) group, which is used to intermittently turn the electromagnet on and off. When the ratchet (17) is not engaged, the trigger piece (138) cannot overcome the static friction and maintains continuous conduction between the two electrode blocks (139), which is used to continuously energize the electromagnet.

6. The polyethylene terephthalate film material melt blending production system according to claim 5, characterized in that, The ratchet component (17) includes: The pawl (170) is provided with multiple pawls at equal intervals around its circumference and is connected to the stirring shaft (120) by means of a mounting bracket (171), and a torsion spring is provided at the connection with the mounting bracket (171); The inner wall of the mounting ring (137) is provided with ratchet teeth (172) that engage with the pawl (170).

7. The polyethylene terephthalate film material melt blending production system according to claim 1, characterized in that: The first conveying channel (9), the second conveying channel (10) and the third conveying channel (11) each include a leading section (90) and an introducing section (91), and the leading section (90) and the introducing section (91) form an angle greater than or equal to 90° and less than 180°. The opening and closing component (16) is installed in the exit section (90), and both the exit section (90) and the inlet section (91) are inclined.

8. The polyethylene terephthalate film material melt blending production system according to claim 7, characterized in that: The opening and closing component (16) includes a piston head (160) slidably connected in the outlet section (90), a piston rod (161) connected to the piston head (160) away from the barrel (4), and a drive cylinder (162) connected to one end of the piston rod (161) away from the piston head (160) and used to drive the piston head (160) to slide.

9. The polyethylene terephthalate film material melt blending production system according to claim 1, characterized in that: The barrel body (4) is provided with a first feed hopper (18) and a second feed hopper (19) on its side, and the first feed hopper (18) is connected to the first drying chamber (6), and the second feed hopper (19) is connected to the second drying chamber (7).

10. A production method applied to the polyethylene terephthalate film material melt blending production system according to any one of claims 1-9, characterized in that, Includes the following steps: S1: The first conveying channel (9), the second conveying channel (10), and the third conveying channel (11) are closed; S2: Take polyethylene terephthalate chips and modified masterbatch in a preset ratio and pour them into the first drying chamber (6) and the second drying chamber (7) respectively. S3: Hot air at a preset temperature is supplied to the first drying chamber (6) and the second drying chamber (7) respectively through the hot air supply unit; S4: The stirring mechanism (12) is started and drives the opening and closing component to intermittently open and close the vibration component, causing the screen (130) to jump and screen the debris in the material, so that the debris is discharged from the air outlet (15) with the hot air. S5: After drying is completed, open the first conveying channel (9) and the second conveying channel (10), and reverse the stirring mechanism (12); S6: After the polyethylene terephthalate chips and modified masterbatch are both fed into the mixing chamber (8), the stirring mechanism (12) switches to forward rotation to perform premixing; S7: During premixing, hot air at a preset temperature is supplied to the mixing chamber (8) through the hot air supply unit. At the same time, the screening mechanism (13) in the mixing chamber (8) screens the debris, so that the debris is discharged from the air outlet (15) along with the hot air. S8: After premixing is completed, the third conveying channel (11) is opened to send the dried and premixed material into the material cylinder (2) for melt blending.

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