A method for producing an antistatic bopet film

Abstract

The application discloses a production method of an antistatic BOPET film, and the BOPET film is composed of an outer surface layer, a middle core layer and an inner surface layer; the outer surface layer is composed of PET, PC, SBR, PE-g-MAH and an antistatic agent; the middle core layer is composed of PET, ECDP, PEG and an antistatic agent; and the inner surface layer is composed of PET, nano silicon dioxide and a silane coupling agent. The antistatic agent is added to the outer surface layer and the middle core layer, so that the antistatic effect of the film is good; the outer surface layer is blended by PET and PC, and SBR and PE-g-MAH are added, so that the impact resistance of the film can be improved; the middle core layer is blended by PET, ECDP and PEG, the addition of PEG can improve the moisture absorption and antistatic performance of the film, the antistatic effect is better after the antistatic agent is used, and the polyether connecting section in ECDP makes PEG more evenly dispersed in PET; the film width is detected by a width detection device, and compared with the manual measurement mode by a tape measure, the method is more accurate and saves time and effort.

Description

Technical Field

[0001] This invention relates to a method for producing an antistatic BOPET film. Background Technology

[0002] BOPET film is a biaxially oriented polyester film. After production, BOPET film needs to be tested for its dimensions and properties, such as its width. During testing, several samples need to be cut and placed one by one on the testing platform. The width is measured with a measuring tape. However, since the film is a thin product, it is easy for the film to "bulge" when measured with a measuring tape, resulting in inaccurate measurement results. The measurement is also time-consuming and laborious. Summary of the Invention

[0003] In view of the above-mentioned deficiencies of the prior art, the object of the present invention is to provide a method for producing antistatic BOPET film.

[0004] To solve the above problems, a method for producing an antistatic BOPET film is provided, wherein the BOPET film is composed of an outer outer layer, an intermediate core layer and an inner outer layer;

[0005] The outer layer is composed of PET, PC, SBR, PE-g-MAH, and antistatic agent;

[0006] The intermediate core layer is composed of PET, ECDP, PEG, and antistatic agent;

[0007] The inner surface layer is composed of PET, nano-silica, and silane coupling agent;

[0008] The production method includes the following steps:

[0009] (1) Weigh the raw materials according to the components of the outer outer layer, the middle core layer and the inner outer layer;

[0010] (2) The outer layer, middle core layer and inner surface layer raw materials are blended separately and fed into their respective extruders for mixing and plasticizing;

[0011] (3) The molten melt is fed into the die head respectively. After the melt merges in the die head, it forms a molten sheet through the flat die head opening.

[0012] (4) Use an air knife to attach the sheet to the cooling roller and cool it rapidly to form an unshaped sheet. Then, after cooling in a water bath, the sheet is shaped to form a cast sheet.

[0013] (5) The cast sheet is stretched to form a thin film;

[0014] (6) The film thickness is detected by infrared light and the corresponding thickness deviation is fed back to the die head. The thickness deviation of the film is corrected by micro-adjusting the heating power of the bolts at the corresponding positions.

[0015] (7) The corona surface is subjected to high-frequency high-voltage spark treatment;

[0016] (8) The size and properties of the film are tested, including width test, surface tension test, thermal shrinkage rate test, tensile strength test, and friction coefficient test. Width test is performed using a width test equipment.

[0017] (9) The tested film is wound up.

[0018] Furthermore, the components of the outer layer, the intermediate core layer, and the inner surface layer are in the following mass ratio: outer layer 20%, intermediate core layer 60%, and inner surface layer 20%.

[0019] Furthermore, the components of the outer layer are as follows by mass ratio: PET 75%, PC 15%, SBR 6%, PE-gMAH 2%, and antistatic agent 2%.

[0020] The components of the intermediate core layer are as follows by mass ratio: PET 75%, ECDP 20%, PEG 3%, and antistatic agent 2%.

[0021] The components of the inner surface layer, by mass ratio, are: 96% PET, 3% nano-silica, and 1% silane coupling agent.

[0022] Furthermore, the antistatic agents for both the outer layer and the intermediate core layer are ethoxylated coconut oil alkylamines.

[0023] Further, in step (8), the width detection device includes a frame, the top of the frame is a worktable, the top of the worktable is fixed with a vertically extending bracket, the front end of the bracket is fixed with a front-to-back extending support platform, a width measuring instrument is installed on the support platform above the worktable, a drive cylinder is fixed at the lower end of the frame along the vertical direction, the piston rod at the upper end of the drive cylinder is connected to a top plate, a vertically extending support rod is fixed at the top of the top plate, a lifting platform is fixed at the top of the support rod, a through hole is provided in the middle of the worktable, the lifting platform extends into the through hole, so that the top surface of the lifting platform and the top surface of the worktable are on the same horizontal plane, and the film to be tested is placed on the top of the lifting platform;

[0024] A roller that can roll back and forth and is used to contact the top surface of the film to be tested is installed on the top of the worktable;

[0025] The support rod includes a fixed rod that is fixed to the top of the top plate and a movable rod that is rotatably connected to the upper end of the fixed rod. The lifting platform is fixed to the top of the movable rod, and a recycling bin is placed at the front end of the frame.

[0026] Furthermore, the width measuring instrument includes a linear laser and an industrial camera located above the lifting platform. A lifting cylinder arranged in the vertical direction is fixed on the top of the support platform. An inclined platform is fixed at the piston rod end of the lower end of the lifting cylinder, and the industrial camera is tilted and fixed on the inclined platform.

[0027] Furthermore, a belt drive device is installed in the upper left and upper right ends of the frame. Both belt drive devices include a belt and a driven pulley and a driving pulley respectively set at the front and rear ends of the belt. A U-shaped frame is fixed at the top of the front end of the belt. A through hole is provided at both the left and right ends of the worktable. The through hole extends forward and backward. The upper end of the U-shaped frame passes through the through hole. The upper end of the U-shaped frame has a U-shaped groove. The roller extends left and right, and the left and right ends of the roller are respectively placed in a U-shaped groove. The roller is in contact with the top surface of the worktable.

[0028] Furthermore, the upper end of the fixed rod and the lower end of the movable rod are connected by a rotating shaft, and a drive motor is connected to the rotating shaft.

[0029] Furthermore, width detection includes the following steps:

[0030] (81) The worker places the cut film to be tested on the top of the lifting platform;

[0031] (82) The belt drive device drives the roller to move backward in a rolling manner. The roller flattens the film to be tested for the first time. Then the belt drive device controls the roller to reset. During the reset process, the roller flattens the film to be tested for the second time.

[0032] (83) A linear laser emits a laser beam that is parallel to the width of the thin film. An industrial camera captures an image of the thin film and captures a clear bright line on the film. The industrial camera then transmits the image of the bright line to a computer, which processes the image using an algorithm to obtain the width data of the thin film.

[0033] (84) After measuring the width, the piston rod of the drive cylinder retracts, causing the lifting platform to move down into the frame;

[0034] (85) Drive the motor to control the movable rod to rotate, so that the lifting platform tilts forward and downward, the film slides into the recycling bin for recycling, and then drive the motor to control the movable rod to reset;

[0035] (86) The piston rod of the drive cylinder extends, causing the lifting platform to reset, and the worker then places a new film to be tested on the top of the lifting platform.

[0036] The beneficial effects of this invention are as follows: the addition of antistatic agents to the outer layer and the intermediate core layer results in good antistatic properties of the film; the outer layer is made by blending PET and PC, and adding SBR and PE-g-MAH, which can improve the impact resistance of the film; the intermediate core layer is made by blending PET, ECDP, and PEG, and the addition of PEG can improve the moisture absorption and antistatic properties of the film. The antistatic effect is even better when used in conjunction with antistatic agents; ECDP contains polyether segments, which makes the PEG more uniformly dispersed in PET; the width of the film is measured by a width detection device, which is more accurate and saves more time and effort compared to manual measurement with a tape measure. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the structure of the BOPET film of the present invention;

[0038] Figure 2 This is a side view of the width detection device of the present invention;

[0039] Figure 3 This is a schematic diagram of the internal structure of the frame of the width detection device of the present invention;

[0040] Figure 4 This is a schematic diagram of the installation of the roller shaft of the present invention;

[0041] Figure 5 This is a schematic diagram of the belt drive device of the present invention.

[0042] In the diagram: 100—outer layer, 200—middle core layer, 300—inner surface layer, 400—width detection equipment, 1—frame, 2—workbench, 21—through hole, 22—long through hole, 3—bracket, 4—support platform, 5—drive cylinder, 6—top plate, 7—support rod, 71—fixed rod, 72—movable rod, 8—lifting platform, 9—roller, 10—recycling bin, 11—linear laser, 12—industrial camera, 13—lifting cylinder, 14—sloping platform, 15—belt drive device, 151—belt, 152—driven wheel, 153—drive wheel, 16—U-shaped frame, 17—rotating shaft, 18—drive motor. Detailed Implementation

[0043] To provide a more intuitive and complete understanding of the technical solution of this invention, the following non-limiting features are described in conjunction with the accompanying drawings:

[0044] like Figure 1 As shown, a method for producing an antistatic BOPET film is described. The BOPET film consists of an outer outer layer 100, a middle core layer 200, and an inner outer layer 300.

[0045] The outer layer 100 is composed of PET, PC, SBR, PE-g-MAH, and antistatic agent;

[0046] The intermediate core layer 200 is composed of PET, ECDP, PEG, and antistatic agent;

[0047] The inner surface layer 300 is composed of PET, nano-silica, and silane coupling agent;

[0048] The production method of BOPET film includes the following steps:

[0049] (1) Weigh the raw materials according to the components of outer layer 100, middle core layer 200 and inner surface layer 300 respectively;

[0050] (2) The outer layer 100, the middle core layer 200 and the inner surface layer 300 raw materials are blended separately and sent to their respective extruders for mixing and plasticizing;

[0051] (3) The molten melt is fed into the die head respectively. After the melt merges in the die head, it forms a molten sheet through the flat die head opening.

[0052] (4) Use an air knife to attach the sheet to the cooling roller and cool it rapidly to form an unshaped sheet. Then, after cooling in a water bath, the sheet is shaped to form a cast sheet.

[0053] (5) The cast sheet is stretched to form a thin film;

[0054] (6) The film thickness is detected by infrared light and the corresponding thickness deviation is fed back to the die head. The thickness deviation of the film is corrected by micro-adjusting the heating power of the bolts at the corresponding positions.

[0055] (7) The corona surface is subjected to high-frequency high-voltage spark treatment;

[0056] (8) The size and properties of the film are tested, including width test, surface tension test, thermal shrinkage rate test, tensile strength test, and friction coefficient test. Width test is performed using a width testing device 400.

[0057] (9) The tested film is wound up.

[0058] The components of the outer layer 100, the intermediate core layer 200, and the inner surface layer 300 are in the following mass ratio: outer layer 100 20%, intermediate core layer 200 60%, and inner surface layer 300 20%.

[0059] The components of the outer layer 100 by mass ratio are: PET 75%, PC 15%, SBR 6%, PE-g-MAH 2%, and antistatic agent 2%.

[0060] The components of the intermediate core layer 200 are as follows by mass ratio: PET 75%, ECDP 20%, PEG 3%, and antistatic agent 2%.

[0061] The components of the inner surface layer 300, by mass ratio, are: PET 96%, nano silica 3%, and silane coupling agent 1%.

[0062] The antistatic agent for both the outer layer 100 and the intermediate core layer 200 is ethoxycocylamine.

[0063] In step (8), such as Figure 2 — Figure 5 As shown, the width measuring device 400 includes a frame 1, with a worktable 2 at the top of the frame 1. A vertically extending bracket 3 is fixed to the top of the worktable 2, and a front-to-back extending support platform 4 is fixed to the front end of the bracket 3. A width measuring instrument is mounted on the support platform 4 above the worktable 2. A drive cylinder 5, arranged vertically, is fixed to the lower end of the frame 1. A top plate 6 is connected to the piston rod at the upper end of the drive cylinder 5. A vertically extending support rod 7 is fixed to the top of the top plate 6, and a lifting platform 8 is fixed to the top of the support rod 7. A vertically extending support platform 8 is provided in the middle of the worktable 2. A through hole 21 is provided, into which the lifting platform 8 extends, so that the top surface of the lifting platform 8 is on the same horizontal plane as the top surface of the workbench 2. The film to be tested is placed on the top of the lifting platform 8. A roller 9 that can roll back and forth and is used to contact the top surface of the film to be tested is installed on the top of the workbench 2. The support rod 7 includes a fixed rod 71 fixed to the top of the top plate 6 and a movable rod 72 rotatably connected to the upper end of the fixed rod 71. The lifting platform 8 is fixed to the top of the movable rod 72. A recycling bin 10 is placed at the front end of the frame 1, and the recycling bin 10 is located in front of and below the lifting platform 8.

[0064] like Figure 2 As shown, the width measuring instrument includes a linear laser 11 and an industrial camera 12 located above the lifting platform 8. A lifting cylinder 13, arranged vertically, is fixed to the top of the support platform 4. A ramp 14 is fixed to the piston rod end of the lower end of the lifting cylinder 13, and the industrial camera 12 is tilted and fixed on the ramp 14. The lifting cylinder 13 can drive the industrial camera 12 to move up and down, facilitating better shooting by the industrial camera 12.

[0065] like Figure 4 and Figure 5As shown, a belt drive device 15 is installed in the upper left and upper right ends of the frame 1. Each belt drive device 15 includes a belt 151 and a driven pulley 152 and a driving pulley 153 respectively located at the front and rear ends of the belt 151. The driving pulley 153 is driven by a motor (not shown). A U-shaped frame 16 is fixed to the top of the front end of the belt 151. A through hole 22 is provided at both the left and right ends of the worktable 2, extending forward and backward. The upper end of the U-shaped frame 16 extends through the through hole 22 and has a U-shaped groove at its upper end. A roller 9 extends left and right, with its left and right ends respectively placed into a U-shaped groove. The roller 9 contacts the top surface of the worktable 2. The roller 9 can roll because it contacts the top surface of the worktable 2 during movement. Since the film may bulge in some areas after being placed on the lifting platform 8, the roller 9 can flatten the film to a certain extent.

[0066] like Figure 3 As shown, the upper end of the fixed rod 71 and the lower end of the movable rod 72 are connected by a rotating shaft 17, and a drive motor 18 is connected to the rotating shaft 17.

[0067] Width detection includes the following steps:

[0068] (81) The worker places the cut film to be tested on the top of the lifting platform 8;

[0069] (82) When the motor connected to the drive wheel 153 rotates forward, the belt drive device 15 drives the roller 9 to move backward in a rolling manner. The roller 9 flattens the film to be tested for the first time. Then the belt drive device 15 controls the roller 9 to reset (the motor connected to the drive wheel 153 can be driven by reversing). The roller 9 flattens the film to be tested for the second time during the reset process.

[0070] (83) The linear laser 11 emits a laser beam that is parallel to the width direction of the thin film. The industrial camera 12 captures an image of the thin film and captures a clear bright line on the thin film. After capturing this bright line, the industrial camera 12 transmits it to the computer. The computer obtains the width data of the thin film through algorithm processing.

[0071] (84) After measuring the width, the piston rod of the drive cylinder 5 retracts, causing the lifting platform 8 to move down into the frame 1;

[0072] (85) Drive motor 18 controls movable rod 72 to rotate, so that lifting platform 8 tilts forward and downward, and film slides into recycling bin 10 for recycling. Then drive motor 18 controls movable rod 72 to reset.

[0073] (86) The piston rod of the drive cylinder 5 extends, so that the lifting platform 8 is reset, and the worker puts a new film to be tested on the top of the lifting platform 8.

[0074] The present invention incorporates antistatic agents into the outer layer 100 and the intermediate core layer 200, resulting in a film with good antistatic properties. The outer layer 100 is made by blending PET and PC, and adding SBR and PE-g-MAH, which can improve the impact resistance of the film. The intermediate core layer 200 is made by blending PET, ECDP, and PEG. The addition of PEG can improve the moisture absorption and antistatic properties of the film. The antistatic effect is even better when used with antistatic agents. ECDP contains polyether segments, which makes the PEG more uniformly dispersed in PET.

[0075] This invention uses a width detection device 400 to detect the width of the film. Once the width of a film is measured, it does not need to be manually removed from the lifting platform 8. The film will automatically fall into the recycling bin 10. Compared with the method of manually measuring with a tape measure, this method is more accurate and saves more time and effort.

Claims

1. A method for producing an antistatic BOPET film, characterized in that: BOPET film consists of an outer layer, a middle core layer, and an inner layer; The outer layer is composed of PET, PC, SBR, PE-g-MAH, and antistatic agent; The intermediate core layer is composed of PET, ECDP, PEG, and antistatic agent; The inner surface layer is composed of PET, nano-silica, and silane coupling agent; The production method includes the following steps: (1) Weigh the raw materials according to the components of the outer outer layer, the middle core layer and the inner outer layer; (2) The outer layer, middle core layer and inner surface layer raw materials are blended separately and fed into their respective extruders for mixing and plasticizing; (3) The molten melt is fed into the die head respectively. After the melt merges in the die head, it forms a molten sheet through the flat die head opening. (4) Use an air knife to attach the sheet to the cooling roller and cool it rapidly to form an unshaped sheet. Then, after cooling in a water bath, the sheet is shaped to form a cast sheet. (5) The cast sheet is stretched to form a thin film; (6) The film thickness is detected by infrared light and the corresponding thickness deviation is fed back to the die head. The thickness deviation of the film is corrected by micro-adjusting the heating power of the bolts at the corresponding positions. (7) The corona surface is subjected to high-frequency high-voltage spark treatment; (8) The size and properties of the film are tested, including width test, surface tension test, thermal shrinkage rate test, tensile strength test, and friction coefficient test. Width test is performed using a width test equipment. (9) The tested film is then wound up; In step (8), the width detection device includes a frame, the top of the frame is a worktable, the top of the worktable is fixed with a vertically extending bracket, the front end of the bracket is fixed with a front-to-back extending support platform, the support platform is mounted on the support platform and located above the worktable, the lower end of the frame is fixed with a drive cylinder arranged in the vertical direction, the piston rod at the upper end of the drive cylinder is connected to a top plate, the top of the top plate is fixed with a vertically extending support rod, the top of the support rod is fixed with a lifting platform, the middle of the worktable is provided with a vertically penetrating through hole, the lifting platform extends into the through hole so that the top surface of the lifting platform and the top surface of the worktable are on the same horizontal plane, and the film to be tested is placed on the top of the lifting platform; A roller that can roll back and forth and is used to contact the top surface of the film to be tested is installed on the top of the worktable; The support rod includes a fixed rod fixed to the top of the top plate and a movable rod rotatably connected to the upper end of the fixed rod. The lifting platform is fixed to the top of the movable rod, and a recycling bin is placed at the front end of the frame. The width measuring instrument includes a linear laser and an industrial camera located above the lifting platform. A lifting cylinder is fixed on the top of the support platform and is arranged in the vertical direction. A ramp is fixed at the piston rod end of the lower end of the lifting cylinder, and the industrial camera is fixed at an angle on the ramp. A belt drive device is installed in the upper left and upper right ends of the frame. Both belt drive devices include a belt and a driven pulley and a driving pulley respectively set at the front and rear ends of the belt. A U-shaped frame is fixed at the top of the front end of the belt. A through hole is provided at both the left and right ends of the worktable. The through hole extends back and forth. The upper end of the U-shaped frame passes through the through hole. The upper end of the U-shaped frame has a U-shaped groove. The roller extends left and right, and the left and right ends of the roller are respectively placed in a U-shaped groove. The roller is in contact with the top surface of the worktable.

2. The method for producing an antistatic BOPET film according to claim 1, characterized in that: The components of the outer layer, intermediate core layer, and inner surface layer are in the following mass ratio: outer layer 20%, intermediate core layer 60%, and inner surface layer 20%.

3. The method for producing an antistatic BOPET film according to claim 1, characterized in that: The outer layer is composed of the following components by mass ratio: PET 75%, PC 15%, SBR 6%, PE-g-MAH 2%, and antistatic agent 2%. The components of the intermediate core layer are as follows by mass ratio: PET 75%, ECDP 20%, PEG 3%, and antistatic agent 2%; The components of the inner surface layer, by mass ratio, are: 96% PET, 3% nano-silica, and 1% silane coupling agent.

4. The method for producing an antistatic BOPET film according to claim 1, characterized in that: The antistatic agents for both the outer layer and the middle core layer are ethoxylated coconut oil alkylamines.

5. The method for producing an antistatic BOPET film according to claim 1, characterized in that: The upper end of the fixed rod and the lower end of the movable rod are connected by a rotating shaft, which is connected to a drive motor.

6. The method for producing an antistatic BOPET film according to claim 5, characterized in that... Width detection includes the following steps: (81) The worker places the cut film to be tested on the top of the lifting platform; (82) The belt drive device drives the roller to move backward in a rolling manner. The roller flattens the film to be tested for the first time. Then the belt drive device controls the roller to reset. During the reset process, the roller flattens the film to be tested for the second time. (83) A linear laser emits a laser beam that is parallel to the width of the thin film. An industrial camera takes an image of the thin film and captures a clear bright line on the film. The industrial camera then transmits the image of the bright line to a computer, which processes the image using an algorithm to obtain the width data of the thin film. (84) After measuring the width, the piston rod of the drive cylinder retracts, causing the lifting platform to move down into the frame; (85) Drive the motor to control the movable rod to rotate, so that the lifting platform tilts forward and downward, the film slides into the recycling bin for recycling, and then drive the motor to control the movable rod to reset; (86) The piston rod of the drive cylinder extends, causing the lifting platform to reset, and the worker then places a new film to be tested on the top of the lifting platform.

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