An online stretching and coating manufacturing method for high-barrier film blowing

Abstract

The present invention relates to a method for manufacturing a high-barrier film by online stretching and coating during film blowing. The high-barrier film blowing online stretching and coating manufacturing equipment includes an extruder for extruding the film, a die, an air ring, an upper rotation traction device for stretching the film, a heating and stretching rotation device for heating the film, and a winder for winding the film. Between the heating and stretching rotation device and the winder, there are successively arranged a coating mechanism for coating a high-barrier coating on the surface of the film, an air-floating drying device for drying the film, and a shaping and cooling mechanism for shaping and cooling the film. The high-barrier coating is coated on the surface of the film through the coating mechanism, then dried through the air-floating drying device, and finally shaped and cooled through the shaping and cooling mechanism, so that the high-barrier coating can firmly adhere to the surface of the film without falling off, and the process is simple and easy to operate.

Description

Technical Field

[0001] The present invention relates to the technical field of thin film production and manufacturing, and particularly relates to an on-line stretching and coating manufacturing method for high-barrier thin film blowing. Background Art

[0002] Chinese Patent Document No. CN114770970A disclosed an on-line stretching and integrating production line for film blowing on July 22, 2022, which includes an extruder for extruding the film, a die, an air ring for cooling the film, an upper rotating traction device for stretching the film, a heating and stretching rotating device, and a winder for winding the film.

[0003] The applicant adds a process of coating a high-barrier coating on the film on the basis of the above production line. Summary of the Invention

[0004] The purpose of the present invention is to provide an on-line stretching and coating manufacturing method for high-barrier thin film blowing, which can coat a high-barrier coating on the film and improve the film performance.

[0005] An on-line stretching and coating manufacturing method for high-barrier thin film blowing, the on-line stretching manufacturing equipment for high-barrier thin film blowing includes an extruder for extruding the film, a die, an air ring for cooling the film, an upper rotating traction device for stretching the film, a heating and stretching rotating device for heating the film, and a winder for winding the film. A coating mechanism for coating a high-barrier coating on the surface of the film, an air-floating drying device for drying the film, and a shaping and cooling mechanism for shaping and cooling the film are sequentially arranged between the heating and stretching rotating device and the winder. It also includes a controller with a control program;

[0006] The electric control components of the extruder, the heating and stretching rotating device, the coating mechanism, the air-floating drying device, and the shaping and cooling mechanism are respectively electrically connected to the controller through wire harnesses. The manufacturing method includes the following steps:

[0007] After the extruder plasticizes the plastic particles, the plastic particles enter the die through a screen changer and an adapter. After the film bubble formed from the die is blown and expanded by internal cooling of the air ring to form a film, the film sequentially passes through the upper rotating traction device, the heating and stretching rotating device, the coating mechanism, the air-floating drying device, and the shaping and cooling mechanism;

[0008] Among them, the coating mechanism coats the high-barrier coating on the surface of the film through a rotating roller. The film coated with the high-barrier coating enters the air-floating drying device for drying. After the film is dried, it passes through the shaping and cooling mechanism for post-treatment of the film. After the above steps are completed, the film enters the winder through a traction device and a deviation rectifying device for winding to form a cylindrical film roll.

[0009] The drying temperature of the air flotation drying device is 70°C - 80°C.

[0010] The air flotation drying device includes a temperature sensor that transmits temperature detection information to the control program of the controller. By inputting a drying temperature set value on the control panel of the device, if the temperature sensor detects that the drying temperature value of the air flotation drying device is higher than the drying temperature set value, the controller controls the heater in the air flotation drying device to stop heating until the temperature in the air flotation drying device is lower than the drying temperature set value, and then the heater in the air flotation drying device restarts.

[0011] The air flotation drying device includes a drying box body and a number of first nozzles and second nozzles for jetting air arranged inside the drying box body. The jet orifices of the first nozzles and the second nozzles face each other, and a drying channel for the film to pass through is arranged between the first nozzles and the second nozzles. The air flotation drying device includes a blower for supplying gas ejected by the first nozzles and the second nozzles. By inputting a blower speed set value on the control panel of the device, the control program of the controller adjusts the speed of the blower in real time.

[0012] The high-barrier coating is a PVA material or a water-blocking material.

[0013] The shaping and cooling mechanism includes a number of rotating rollers. Oil for shaping the film is provided inside a part of the rotating rollers, and a coolant for cooling the film is provided inside another part of the rotating rollers. The film passes through a number of rotating rollers of the shaping and cooling mechanism under traction, and the number of rotating rollers is rotated by a first motor. By setting the speed of the first motor on the control panel of the device, the rotating speed of the rotating rollers is changed.

[0014] The temperature of the extruder screw is 170°C - 250°C, and the rotational speed of the extruder screw is 30 - 100 revolutions per minute.

[0015] When the shaping and cooling mechanism completes the post-treatment of the film, the operator extracts a part of the film for physical property testing. After the testing, if the operator finds that the testing of the film does not reach the expected testing value, the operator sets relevant temperature parameters and / or blower speed parameters on the control panel of the device.

[0016] The coating mechanism includes a roller coating box body for loading the high-barrier coating liquid, and a number of rotating drums rotatably arranged inside the roller coating box body and cooperating to traction the film. The film is coated with the high-barrier coating through the rotation of the rotating drums.

[0017] The number of rotating drums is rotated by a second motor. By setting the speed of the second motor on the control panel, the rotating speed of the rotating drums is changed.

[0018] The present invention is provided with a coating mechanism, an air-floating drying device and a shaping and cooling mechanism. The high-barrier coating is applied to the surface of the film through the coating mechanism, then dried through the air-floating drying device, and finally shaped and cooled through the shaping and cooling mechanism, so that the high-barrier coating can firmly adhere to the surface of the film without falling off, and the process is simple and easy to operate. The coating mechanism is composed of a roll coating box body, a plurality of rotating rollers and a motor. The air-floating drying device is composed of a drying box body, a nozzle and a heating device (heating tube). The shaping and cooling mechanism is composed of a rolling box body, a rotating roller and a motor. The structures of the three are very simple. The high-barrier coating is applied to the surface of the film to improve the mechanical properties and tensile strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is the front view of the high-barrier film blown film online stretching coating manufacturing equipment in an embodiment of the present invention.

[0020] Figure 2 It is the front view of the coating mechanism in an embodiment of the present invention.

[0021] Figure 3 It is the front view of the shaping and cooling mechanism in an embodiment of the present invention.

[0022] Figure 4 It is the front view of the air-floating drying device in an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The present invention will be further described below in conjunction with the drawings and embodiments.

[0024] A method for manufacturing a high-barrier film blown film online stretching coating. The high-barrier film blown film online stretching manufacturing equipment includes an extruder 2 for extruding a film 1, a die 3, an air ring 4 for cooling the film 1, an upper rotary traction device 5 for stretching the film, a heating and stretching rotary device 6 for heating the film 1, and a winder 7 for winding the film. Between the heating and stretching rotary device 6 and the winder 7, there are successively arranged a coating mechanism 8 for coating a high-barrier coating on the surface of the film 1, an air-floating drying device 9 for drying the film 1, and a shaping and cooling mechanism 10 for shaping and cooling the film 1. It also includes a controller with a control program.

[0025] The electric control components of the extruder 2, the heating and stretching rotary device 6, the coating mechanism 8, the air-floating drying device 9, and the shaping and cooling mechanism 10 are respectively electrically connected to the controller through wire harnesses. The manufacturing method includes the following steps:

[0026] After the extruder 2 plasticizes the plastic particles, the plastic particles enter the mold 3 through the screen changer and the adapter. After the film bubble formed from the mold 3 is inflated by the air ring 4 to form a film 1, the film 1 passes through the upward spinning traction device 5, the heating and stretching rotating device 6, the coating mechanism 8, the air floating drying device 9, and the shaping cooling mechanism 10 in sequence;

[0027] Among them, the coating mechanism 8 coats the high barrier coating on the surface of the film 1 through a rotating roller. The film 1 coated with the high barrier coating enters the air flotation drying device 9 for drying. After the film 1 is dried, it passes through the shaping cooling mechanism 10 for post-processing. After completing the above steps, the film 1 passes through the traction device and the correction device and enters the winder 7 for winding to form a cylindrical film roll.

[0028] The drying temperature of the air-floating drying device 9 is 70°C-80°C.

[0029] The air-floating drying device 9 includes a temperature sensor on a control program of the controller that transmits temperature detection information. By inputting a drying temperature setting value on the control panel of the device, if the temperature sensor detects that the drying temperature value of the air-floating drying device 9 is higher than the drying temperature setting value, the controller controls the heater in the air-floating drying device 9 to stop heating until the temperature in the air-floating drying device 9 is lower than the drying temperature setting value, and then the heater in the air-floating drying device 9 restarts.

[0030] The air-floating drying device 9 includes a drying box 13 and a plurality of first nozzles 14 and second nozzles 15 for jetting air arranged inside the drying box 13. The jet ports of the first nozzle 14 and the second nozzle 15 are arranged facing each other. A drying channel 16 for the film 1 to pass through is arranged between the first nozzle 14 and the second nozzle 15. The air-floating drying device 9 includes a fan for the first nozzle 14 and the second nozzle 15 to jet air. By inputting a fan speed setting value on the control panel of the device, the control program of the controller adjusts the fan speed in real time.

[0031] The high barrier coating is a PVA material or a water-blocking material.

[0032] The shaping and cooling mechanism 10 includes a plurality of rotating rollers, some of which are provided with oil for shaping the film 1, and other rotating rollers are provided with cooling liquid for cooling the film 1. The film 1 passes through the plurality of rotating rollers of the shaping and cooling mechanism 10 under traction, and the plurality of rotating rollers are connected to the first motor in transmission. The rotation speed of the rotating rollers can be changed by setting the rotation speed of the first motor on the control panel of the equipment.

[0033] The screw temperature of the extruder 2 is 170°C-250°C, and the screw speed of the extruder 2 is 30-100 revolutions per minute.

[0034] When the shaping cooling mechanism 10 completes the post-processing of the film 1, the operator extracts a portion of the film 1 for physical property testing. After the test, if the operator finds that the test of the film 1 does not reach the expected test value, the operator sets the relevant temperature parameters and / or fan speed parameters on the control panel of the equipment.

[0035] The coating mechanism 8 includes a roller coating box 11 for loading high-barrier coating liquid, and a plurality of rotating rollers 12 rotatably arranged inside the roller coating box 11 and cooperating with the pulling film 1. The film 1 is coated with the high-barrier coating by the rotation of the rotating rollers 12.

[0036] A plurality of rotating rollers are transmission-connected with the second motor, and the rotation speed of the rotating rollers can be changed by setting the rotation speed of the second motor on the control panel.

[0037] See also Figures 1 - 4 The high-barrier film blown film online stretching manufacturing equipment comprises an extruder 2 for extruding a film 1, a mold 3, an air ring 4 for cooling the film 1, an upward rotation traction device 5 for stretching the film, a heating and stretching rotating device 6 for heating the film 1 and a winder 7 for winding the film, and a coating mechanism 8 for coating the surface of the film 1 with a high-barrier coating, an air-floating drying device 9 for drying the film 1 and a shaping cooling mechanism 10 for shaping and cooling the film 1 are sequentially arranged between the heating and stretching rotating device 6 and the winder 7.

[0038] The coating mechanism 8 includes a roller coating box 11 for loading a high-barrier coating, a rotating roller 12 rotatably arranged inside the roller coating box 11 and used to pull the film 1, and a servo motor assembly that drives the rotating roller 12 to rotate through a transmission assembly (such as a gear). After the film 1 enters the roller coating box 11, the high-barrier coating is coated on the surface of the film 1 through the traction of the rotating roller 12, and the rotating roller 12 is immersed in the high-barrier coating solution.

[0039] The air-floating drying device 9 includes a drying box 13 and a plurality of first nozzles 14 and second nozzles 15 for jetting air, which are arranged inside the drying box 13. The jet ports of the first nozzle 14 and the second nozzle 15 are arranged facing each other, and a drying passage 16 for the film 1 to pass through is arranged between the first nozzle 14 and the second nozzle 15. A heating device (such as a heating tube) is also arranged inside the drying box 13. When the film 1 passes through the drying passage 16, the first nozzle 14 and the second nozzle 15 spray gas relative to each other, so that the film 1 floats in the drying box 13 and does not contact anything, so that the high barrier coating on the surface of the film 1 can be fully dried.

[0040] The drying channel 16 is in an inverted U shape, and the first nozzle 14 is not provided at the top of the U shape (because the gravity of the film 1 can offset the buoyancy of the second nozzle 15).

[0041] The first nozzle 14 and the second nozzle 15 are arranged at intervals from each other.

[0042] The shaping and cooling mechanism 10 includes a rolling box body 17, a second traction roller group 18 arranged inside the rolling box body 17 and used for pulling the film 1, and a servo motor assembly that drives the second traction roller group 18 to rotate through a transmission component (such as a gear). Inside the second traction roller group 18, there is a shaping liquid for shaping the film 1 and a cooling liquid for cooling the film 1. The shaping liquid is oil, and the cooling liquid is water. After the film 1 enters the rolling box body 17, through the traction of the second traction roller group 18, when the film 1 passes through the second traction roller group 18, the oil shapes the high-barrier coating on the surface of the film 1, and the water cools the high-barrier coating on the surface of the film 1.

[0043] The second traction roller group 18 includes a number of traction rollers 19 arranged vertically and staggeredly. The traction rollers 19 are of a hollow structure for loading the shaping liquid and the cooling liquid. One side of the traction roller 19 is provided with a liquid inlet 20 for introducing the shaping liquid and the cooling liquid.

[0044] At the bottom of the roller coating box body 11, there is a first guiding roller assembly 21 and a second guiding roller assembly 22. One end of the first guiding roller assembly 21 is butted against one end of the rotating drum 12, the other end of the first guiding roller assembly 21 is butted against one end of the drying channel 16, one end of the second guiding roller assembly 22 is butted against the other end of the drying channel 16, and the other end of the second guiding roller assembly 22 is butted against one end of the second traction roller group 18. The above structure is used for conveying the film 1.

[0045] At the bottom of the heating, stretching and rotating device 6, there is an up-and-down stretching and traction device 23. The up-and-down stretching and traction device 23 is butted against the other end of the rotating drum 12. At the top of the winding machine 7, there is a traction device 24. The other end of the second traction roller group 18 is butted against the traction device 24. The above structure is used for conveying the film 1.

[0046] For other structures of this high-barrier film blown film online stretching manufacturing equipment and the film preparation method, reference can be made to Patent CN114770970A and Patent CN114905728A.

[0047] The above is the preferred solution of the present invention, which shows and describes the basic principle, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for manufacturing a high-barrier film by in-line stretching and coating during blown film production. The high-barrier film in-line stretching and coating manufacturing equipment includes an extruder (2) for extruding a film (1), a die (3), an air ring (4) for cooling the film (1), an upper-rotation traction device (5) for stretching the film, a heating and stretching rotation device (6) for heating the film (1), and a winder (7) for winding the film. It is characterized in that: An extrusion machine (2), a heating and stretching rotary device (6), a coating mechanism (8) for coating a high-barrier coating on the surface of the film (1), an air-floating drying device (9) for drying the film (1), and a shaping and cooling mechanism (10) for shaping and cooling the film (1) are sequentially arranged between the heating and stretching rotary device (6) and the winding machine (7). It also includes a controller with a control program. The electrical control components of the extrusion machine (2), the heating and stretching rotary device (6), the coating mechanism (8), the air-floating drying device (9), and the shaping and cooling mechanism (10) are respectively electrically connected to the controller through wire harnesses. Its manufacturing method includes the following steps: After the extrusion machine (2) plasticizes the plastic particles, the plastic particles enter the die (3) through a screen changer and an adapter. After the film bubble formed from the die (3) is cooled and blown by the internal air ring (4) to form the film (1), the film (1) sequentially passes through the upper rotary traction device (5), the heating and stretching rotary device (6), the coating mechanism (8), the air-floating drying device (9), and the shaping and cooling mechanism (10). Among them, the coating mechanism (8) coats the high-barrier coating on the surface of the film (1) through a rotating roller. The film (1) after coating the high-barrier coating enters the air-floating drying device (9) for drying. After the film (1) is dried, it passes through the shaping and cooling mechanism (10) for post-treatment of the film (1). After completing the above steps, the film (1) enters the winding machine (7) through the traction device and the deviation rectifying device for winding to form a cylindrical film roll.

2. The online stretching and coating manufacturing method of the high-barrier thin film by blown film according to claim 1, characterized in that: The drying temperature of the air-floating drying device (9) is 70°C - 80°C.

3. The online stretching and coating manufacturing method of the high-barrier film by blown film according to claim 1, characterized in that: The air-floating drying device (9) includes a temperature sensor that transmits the temperature detection information to the control program of the controller. By inputting the drying temperature setting value on the control panel of the device, if the temperature sensor detects that the drying temperature value of the air-floating drying device (9) is higher than the drying temperature setting value, the controller controls the heater in the air-floating drying device (9) to stop heating until the temperature in the air-floating drying device (9) is lower than the drying temperature setting value, and then the heater in the air-floating drying device (9) restarts.

4. The method for manufacturing a high-barrier film by in-line stretching and coating during film blowing according to claim 1, characterized in that: The air-floating drying device (9) includes a drying box body (13) and a number of first nozzles (14) and second nozzles (15) for jetting air arranged inside the drying box body (13). The jet orifices of the first nozzles (14) and the second nozzles (15) face each other. A drying channel (16) for the film (1) to pass through is arranged between the first nozzles (14) and the second nozzles (15). The air-floating drying device (9) includes a blower for supplying the gas jetted by the first nozzles (14) and the second nozzles (15). By inputting the blower speed setting value on the control panel of the device, the control program of the controller adjusts the speed of the blower in real time.

5. The method for manufacturing a high-barrier thin film by in-line stretching and coating during blown film production according to claim 1, characterized in that: The high-barrier coating is a PVA material or a water-blocking material.

6. The method for manufacturing a high-barrier film by online stretching and coating during film blowing according to claim 1, wherein: The shaping and cooling mechanism (10) includes several rotating rollers. Oil for shaping the film (1) is provided inside some of the rotating rollers, and coolant for cooling the film (1) is provided inside the other part of the rotating rollers. The film (1) is drawn through several rotating rollers of the shaping and cooling mechanism (10). The several rotating rollers are drivingly connected to the first motor. By setting the rotation speed of the first motor on the control panel of the equipment, the rotation speed of the rotating rollers is changed.

7. The method for manufacturing a high-barrier film by online stretching and coating during film blowing according to claim 1, wherein: The temperature of the screw of the extruder (2) is 170°C - 250°C, and the rotation speed of the screw of the extruder (2) is 30 - 100 revolutions per minute.

8. The method for manufacturing a high-barrier film by online stretching and coating during film blowing according to claim 1, characterized in that: When the shaping and cooling mechanism (10) finishes the post-treatment of the film (1), the operator extracts a part of the film (1) for physical property detection. After the detection, if the operator finds that the detection of the film (1) does not reach the expected detection value, the operator sets the relevant temperature parameters and / or the fan rotation speed parameters on the control panel of the equipment.

9. The method for manufacturing a high-barrier thin film by in-line stretching and coating during blown film production according to claim 1, characterized in that: The coating mechanism (8) includes a roller coating box body (11) for loading the high-barrier coating liquid, and several rotating drums (12) rotatably arranged inside the roller coating box body (11) and cooperating to draw the film (1). The film (1) is coated with the high-barrier coating through the rotation of the rotating drums (12).

10. The method for manufacturing a high-barrier thin film by in-line stretching and coating during blown film production according to claim 9, wherein: The several rotating drums are drivingly connected to the second motor. By setting the rotation speed of the second motor on the control panel, the rotation speed of the rotating drums is changed.

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