A polyimide film colloidal stripping device

Abstract

The invention relates to the field of polyimide film processing, and in particular to a polyimide film colloidal stripping device. At least three belt rollers are rotatably arranged in a box body, and a plurality of steel belts are axially arranged and wound around the outside of the belt rollers. Two belt rollers stretch the upper part of the steel belts to form a horizontal bearing surface for coating a PAA solution to form a PAA film. A motor is connected to one of the belt rollers to drive the steel belt to conduct the PAA film. The steel belt conducts downward from the horizontal bearing surface as a reversing surface. An axle tube is rotatably arranged on the side of the reversing surface. The invention adopts a plurality of axially arranged steel belts to conduct the PAA film in a right-angled triangle profile. There is an angle difference of 90° between the adjacent positions and the two groups of aligning positions of the elliptical wheels, so that the adjacent steel belts have a continuously changing angle difference at the right-angle turning position, so that the PAA film is continuously stripped, and both sides of the vertically conducted PAA film can contact the airflow, accelerate the evaporation of the solvent for solidification, and also destroy the adhesion between the PAA film and the steel belt in advance, so that the PAA film can be easily separated from the steel belt after being completely solidified.

Description

Technical Field

[0001] The invention relates to the field of polyimide film processing, in particular to a polyimide film colloid stripping device. Background Art

[0002] Polyimide film is also called PI film, which has many uses, such as slot insulation of motors, cable wrapping materials, transparent polyimide film can be used as a soft solar cell base plate, polyimide fiber can be used for hot gas filtration, polyimide film production methods include impregnation, casting and drooling stretching;

[0003] The drooling method for producing PI film is to evenly coat the defoamed polyamic acid (PAA) solution on a conductive steel belt to form a liquid film of uniform thickness, and then enter the drying channel so that the temperature of the liquid film gradually increases during drying, and the solvent gradually evaporates. The polyamic acid film runs on the steel belt for a circle, and the solvent evaporates to become a solid film. The film peeled off from the steel belt is led to the imidization furnace by a guide roller. After high-temperature imidization, it is wound up by a winder to complete the processing.

[0004] The PAA solution coating and drying process is an important process in the formation of PI film. The PAA liquid film setting speed is directly related to the evaporation of solvent. In the traditional production process, the PAA liquid film is tightly attached to the surface of the steel belt, and the solvent evaporates only by relying on the outer surface of the liquid film. The setting efficiency needs to be improved, and the liquid film is attached to the surface of the steel belt throughout the solidification process, which easily causes wrinkles on the surface of the PAA formed film when it is peeled off from the steel belt, reducing the quality of the PI film. Summary of the invention

[0005] The purpose of the present invention is to solve the following problems existing in the prior art: in the traditional production process, the PAA liquid film is closely attached to the surface of the steel belt, and the solvent is evaporated only by the outer surface of the liquid film, and the shaping efficiency needs to be improved. In addition, the liquid film is attached to the surface of the steel belt during the entire solidification process, which easily causes wrinkles on the surface of the PAA molded film when it is peeled off from the steel belt, thereby reducing the quality of the PI film.

[0006] In order to solve the problems existing in the prior art, the present invention provides a polyimide film colloidal stripping device, comprising a box body, wherein at least three belt rollers are rotatably arranged in the box body, and a plurality of steel belts are axially arranged and wound around the outside of the belt rollers, wherein the upper part of the steel belts stretched by two belt rollers forms a horizontal bearing surface for coating a PAA solution to form a PAA film;

[0007] A motor, the motor transmission is connected to one of the belt rollers, driving the steel belt to conduct the PAA film;

[0008] The shaft tube is a steel belt with a horizontal bearing surface and a downward conducting surface as a reversing surface. A shaft tube is rotatably arranged on the side of the reversing surface. A number of elliptical wheels are axially arranged on the surface of the shaft tube. The angle difference of the elliptical wheels at adjacent positions is 90°. The arranged steel belts are aligned and wound around the outside of the elliptical wheels, so that the steel belt at the reversing surface is concave inward. The steel belts at adjacent positions are supported by the elliptical wheels and have a reversing angle difference.

[0009] Preferably, two groups of shaft tubes are vertically arranged on the side of the reversing surface, and the surfaces of the two groups of shaft tubes are provided with aligned elliptical wheels, the angle difference between the aligned elliptical wheels on the two groups of shaft tube surfaces is 90°, and the steel belt bypasses the elliptical wheels on the two groups of shaft tube surfaces.

[0010] Preferably, the belt roller of the reversing surface is vertically aligned so that the PAA film at the reversing surface is vertically conducted downwards, and a touch roller is rotated at the reversing surface inside the box, and the touch roller contacts the PAA film conducting downwards.

[0011] Preferably, a blower assembly is provided outside the box body, the blower assembly is transmission-connected to the motor, an air duct parallel to the inner wall of the box body is provided at the bottom of the box body, an exhaust end of the blower assembly is connected to the air duct, and an exhaust port is provided at the top of the box body.

[0012] Preferably, the elliptical wheel and the surface of the shaft tube are provided with a plurality of air holes penetrating the inner cavity of the shaft tube, and the exhaust end of the air blowing assembly is connected to the inner cavity of the shaft tube.

[0013] Preferably, a core tube is arranged inside the two shaft tubes, the core tube is fixed to the box body, and an axially extending strip is opened on the surface of the core tube. The strip on the surface of the upper core tube is aligned with the PAA membrane at the corner between the horizontal bearing surface and the reversing surface, and the strip on the surface of the lower core tube is aligned with the PAA membrane inside the reversing surface.

[0014] Preferably, a protruding strip is fixed on the surface of the steel belt contacting the belt roller, and a belt groove is opened on the surface of the steel belt, and the strip is adapted to be pressed into the belt groove.

[0015] Compared with the related art, the polyimide film colloid stripping device provided by the present invention has the following advantages:

[0016] Beneficial effects:

[0017] The present invention uses a plurality of axially arranged steel belts to conduct the PAA film in a right-angled triangle profile, and two rows of elliptical wheels are arranged on the side of the vertical surface to constrain the steel belt to conduct in a concave manner on the vertical surface. There is a 90° angle difference between the adjacent positions and the two groups of counter-positioned positions, so that the adjacent steel belts have a continuously changing angle difference at the right-angle turning position, thereby achieving continuous peeling of the PAA film, keeping both sides of the vertically conducted PAA film in contact with the airflow, accelerating the evaporation of the solvent for solidification, and also destroying the adhesion between the PAA film and the steel belt in advance, so that the PAA film is easy to separate from the steel belt after it is fully solidified, maintaining the complete shape of the PAA film, and improving the molding quality of the polyimide film. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is one of the overall external structure schematic diagrams of the present invention;

[0019] Figure 2 This is the second schematic diagram of the overall external structure of the present invention;

[0020] Figure 3 It is a schematic diagram of the internal structure of the box of the present invention;

[0021] Figure 4 It is a schematic diagram of the steel strip conduction path structure of the present invention;

[0022] Figure 5 This is a schematic diagram of the compression structure of the reversing surface steel strip of the present invention;

[0023] Figure 6 It is a schematic diagram of the contact structure between the elliptical wheel and the steel belt of the present invention;

[0024] Figure 7 It is a schematic diagram of the core barrel distribution structure of the present invention;

[0025] Figure 8 It is a schematic diagram of the steel belt and belt roller positioning structure of the present invention.

[0026] Numbers in the figure: 1. Box body; 11. Casting port; 12. Exhaust port; 13. Material port; 2. Motor; 3. Blower assembly; 31. Air duct; 4. Steel belt; 41. Belt roller; 42. Belt groove; 43. Belt strip; 5. PAA film; 51. Discharge roller; 6. Shaft tube; 61. Elliptical wheel; 62. Core tube; 63. Strip mouth; 64. Air hole; 7. Touch roller. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0028] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0029] Embodiment 1

[0030] like Figure 1-4 As shown, a polyimide film colloidal stripping device is provided, wherein three belt rollers 41 are rotatably installed in a box body 1, and the three belt rollers 41 are arranged in a right-angled triangle. A plurality of steel belts 4 are wound around the outside of the three belt rollers 41, and the steel belts 4 are arranged and distributed along the axial direction of the belt rollers 41, and the steel belts 4 are in a right-angled triangle shape. A right-angled side at the top of the steel belt 4 is a horizontal bearing surface, and another right-angled side of the steel belt 4 is a reversing surface vertically downward. A motor 2 is installed outside the box body 1, and the motor 2 is connected to one of the belt rollers 41 through a belt drive.

[0031] A casting port 11 is provided on the top of the box 1 to apply the PAA solution to the surface of the steel belt 4 at the horizontal bearing surface to form a PAA film 5. The motor 2 is turned on to drive the belt roller 41 to rotate so that the steel belt 4 conducts the PAA film 5 from the horizontal bearing surface to the reversing surface.

[0032] An air duct 31 is provided at the bottom of the box body 1, and the air duct 31 has an opening parallel to the vertical inner wall and the inclined inner wall of the box body 1. The air blowing assembly 3 is installed on the outer wall of the box body 1. The shaft end of the air blowing assembly 3 is connected to the motor 2 through a belt drive. The exhaust end of the air blowing assembly 3 is connected to the air duct 31 through a pipeline. An electric heating assembly is provided at the exhaust part of the air blowing assembly 3 for heating the air. An exhaust port 12 is provided at the top of the box body 1.

[0033] When the motor 2 drives the steel belt 4 to conduct the PAA film 5, the air blowing component 3 works synchronously, cooperates with the electric heating component to generate hot air to be introduced into the air duct 31, and the hot air is conducted along the inner wall of the box body 1 to heat the PAA film 5, so that the solvent in the PAA film 5 gradually evaporates, and the PAA film 5 gradually solidifies, and the gas with the evaporated solvent is discharged from the exhaust port 12 for centralized collection;

[0034] A material port 13 is provided at one end of the box body 1 away from the reversing surface, a discharge roller 51 is rotatably installed inside the material port 13, and the discharge roller 51 is connected to the belt roller 41 through a gear. The cured PAA film 5 is separated from the steel belt 4 at the portion of the discharge roller 51 and discharged through the material port 13, and the discharged PAA film 5 is sent to the imidization furnace;

[0035] like Figure 3-6 As shown, two shaft tubes 6 are vertically distributed and rotatably installed at the reversing surface inside the box body 1, and a plurality of elliptical wheels 61 are axially arranged and fixed on the surfaces of the two shaft tubes 6. The angle difference of the elliptical wheels 61 at adjacent positions is 90°, and the angle difference of the elliptical wheels 61 aligned on the surfaces of the two shaft tubes 6 is 90°. The width of a single elliptical wheel 61 is the same as the width of a single steel belt 4. The steel belts 4 are aligned and wound on the surfaces of the elliptical wheels 61, so that the steel belts 4 at the reversing surface position are concave inwards.

[0036] When the PAA film 5 is transferred from the horizontal bearing surface to the reversing surface, the solvent in the PAA film 5 is partially volatilized, and the PAA film 5 has a certain curing strength. After the PAA film 5 is reversed, due to the angle difference between the elliptical wheels 61 at adjacent positions, the steel belt 4 supported by the elliptical wheels 61 has a reversing angle difference, so that the overall surface of the steel belt 4 is separated, and the continuously rotating shaft tube 6 causes the reversing angle of the single steel belt 4 supported by the elliptical wheel 61 to change continuously, so that the adjacent steel belts 4 alternately peel off the PAA film 5, and the PAA film 5 is easily peeled off from the steel belt 4, and the peeled PAA film 5 is vertically conducted downward, and the PAA film 5 and the steel belt 4 at the entire reversing surface are in a separated state. At this time, the two surfaces of the PAA film 5 can fully volatilize the solvent, which accelerates the curing speed. After the PAA film 5 reaches the inclined surface of the steel belt 4, it is again attached to the steel belt 4 to continue to volatilize the solvent;

[0037] The angle difference between the elliptical wheels 61 on the surfaces of the two sets of shaft tubes 6 is 90°, so that the two sets of elliptical wheels 61 can balance the tension of the steel belt 4 during rotation, avoid excessive changes in the tension of the steel belt 4, and maintain stable conduction to the PAA film 5;

[0038] Embodiment 2

[0039] like Figure 1-4 As shown, three belt rollers 41 are rotatably installed in the box body 1, and the three belt rollers 41 are distributed in a right-angled triangle. A plurality of steel belts 4 are wound around the outside of the three belt rollers 41, and the steel belts 4 are arranged and distributed along the axial direction of the belt rollers 41. The steel belts 4 are in the shape of a right-angled triangle, and a right-angled side at the top of the steel belt 4 is a horizontal bearing surface, and another right-angled side of the steel belt 4 is vertically downward as a reversing surface. A motor 2 is installed outside the box body 1, and the motor 2 is connected to one of the belt rollers 41 through a belt drive;

[0040] A casting port 11 is provided on the top of the box 1 to apply the PAA solution to the surface of the steel belt 4 at the horizontal bearing surface to form a PAA film 5. The motor 2 is turned on to drive the belt roller 41 to rotate so that the steel belt 4 conducts the PAA film 5 from the horizontal bearing surface to the reversing surface.

[0041] An air duct 31 is provided at the bottom of the box body 1, and the air duct 31 has an opening parallel to the vertical inner wall and the inclined inner wall of the box body 1. The air blowing assembly 3 is installed on the outer wall of the box body 1. The shaft end of the air blowing assembly 3 is connected to the motor 2 through a belt drive. The exhaust end of the air blowing assembly 3 is connected to the air duct 31 through a pipeline. An electric heating assembly is provided at the exhaust part of the air blowing assembly 3 for heating the air. An exhaust port 12 is provided at the top of the box body 1.

[0042] When the motor 2 drives the steel belt 4 to conduct the PAA film 5, the air blowing component 3 works synchronously, cooperates with the electric heating component to generate hot air to be introduced into the air duct 31, and the hot air is conducted along the inner wall of the box body 1 to heat the PAA film 5, so that the solvent in the PAA film 5 gradually evaporates, and the PAA film 5 gradually solidifies, and the gas with the evaporated solvent is discharged from the exhaust port 12 for centralized collection;

[0043] A material port 13 is provided at one end of the box body 1 away from the reversing surface, a discharge roller 51 is rotatably installed inside the material port 13, and the discharge roller 51 is connected to the belt roller 41 through a gear. The cured PAA film 5 is separated from the steel belt 4 at the portion of the discharge roller 51 and discharged through the material port 13, and the discharged PAA film 5 is sent to the imidization furnace;

[0044] like Figure 3-6 As shown, two shaft tubes 6 are vertically distributed and rotatably installed at the reversing surface inside the box body 1, and a plurality of elliptical wheels 61 are axially arranged and fixed on the surfaces of the two shaft tubes 6. The angle difference of the elliptical wheels 61 at adjacent positions is 90°, and the angle difference of the elliptical wheels 61 aligned on the surfaces of the two shaft tubes 6 is 90°. The width of a single elliptical wheel 61 is the same as the width of a single steel belt 4. The steel belts 4 are aligned and wound on the surfaces of the elliptical wheels 61, so that the steel belts 4 at the reversing surface position are concave inwards.

[0045] When the PAA film 5 is transferred from the horizontal bearing surface to the reversing surface, the solvent in the PAA film 5 is partially volatilized, and the PAA film 5 has a certain curing strength. After the PAA film 5 is reversed, due to the angle difference between the elliptical wheels 61 at adjacent positions, the steel belt 4 supported by the elliptical wheels 61 has a reversing angle difference, so that the overall surface of the steel belt 4 is separated, and the continuously rotating shaft tube 6 causes the reversing angle of the single steel belt 4 supported by the elliptical wheel 61 to change continuously, so that the adjacent steel belts 4 alternately peel off the PAA film 5, and the PAA film 5 is easily peeled off from the steel belt 4, and the peeled PAA film 5 is vertically conducted downward, and the PAA film 5 and the steel belt 4 at the entire reversing surface are in a separated state. At this time, the two surfaces of the PAA film 5 can fully volatilize the solvent, which accelerates the curing speed. After the PAA film 5 reaches the inclined surface of the steel belt 4, it is again attached to the steel belt 4 to continue to volatilize the solvent;

[0046] The angle difference between the elliptical wheels 61 on the surfaces of the two sets of shaft tubes 6 is 90°, so that the two sets of elliptical wheels 61 can balance the tension of the steel belt 4 during rotation, avoid excessive changes in the tension of the steel belt 4, and maintain stable conduction to the PAA film 5;

[0047] The difference is: Figure 1 , 7 As shown, the interiors of the two shaft tubes 6 are both rotatably adapted to be provided with core barrels 62, the core barrels 62 are fixed to the housing 1, one end of the core barrel 62 passes through the housing 1, and is connected to the exhaust end of the blower assembly 3 through a pipeline, and the surfaces of the two core barrels 62 are both provided with axially extending strips 63, the strips 63 on the surface of the upper core barrel 62 are aligned with the PAA membrane 5 at the corner of the horizontal bearing surface and the reversing surface, and the strips 63 on the surface of the lower core barrel 62 are aligned with the PAA membrane 5 in the reversing surface, and a plurality of air holes 64 penetrating the inner cavity of the shaft tube 6 are provided on the surfaces of the elliptical wheel 61 and the shaft tube 6;

[0048] When the steel belt 4 conducts the PAA film 5, the airflow generated by the air blowing assembly 3 is introduced into the core tube 62. During the rotation of the elliptical wheel 61 and the shaft tube 6, the air holes 64 on the surface thereof are cyclically aligned with the strip openings 63. The air holes 64 on the surface of the upper elliptical wheel 61 pointing to the conversion angle of the PAA film 5 always pass through the strip openings 63. The airflow passes through the air holes 64 and rushes to the conversion angle of the PAA film 5, thereby promoting the separation of the PAA film 5 from the steel belt 4.

[0049] The air holes 64 on the surface of the lower elliptical wheel 61 blow up the inner surface of the vertically conductive PAA film 5 to promote the comprehensive evaporation of the solvent on the surface of the PAA film 5;

[0050] A touch roller 7 is rotated at the reversing surface inside the box 1, and the touch roller 7 contacts the PAA film 5 that conducts downwards. The touch roller 7 increases the stability of the vertical conduction of the PAA film 5, and prevents the PAA film 5 from being deflected by the airflow during the conduction process.

[0051] like Figure 8 As shown, a protruding strip 43 is fixed on the surface of the steel belt 4 contacting the belt roller 41, and a belt groove 42 is opened on the surface of the steel belt 4. The strip 43 is adapted to be pressed into the belt groove 42, so that the steel belt 4 always maintains a precise axial position when driven by the belt roller 41, so that the arranged steel belts 4 form a complete plane on the horizontal bearing surface and the inclined surface, which is used to flatly stick the PAA film 5.

Claims

1. A polyimide film colloid stripping device, characterized in that: include: A box body (1), wherein at least three belt rollers (41) are rotatably arranged inside the box body (1), and a plurality of steel belts (4) are axially arranged and wound around the outside of the belt rollers (41), wherein two belt rollers (41) stretch the upper part of the steel belts (4) to form a horizontal bearing surface for coating a PAA solution to form a PAA film (5); A motor (2), the motor (2) is connected to one of the belt rollers (41) to drive the steel belt (4) to conduct the PAA film (5); A shaft tube (6), wherein the steel belt (4) has a reversing surface as a downward conducting surface from a horizontal bearing surface, and a shaft tube (6) is rotatably arranged on the side of the reversing surface, and a plurality of elliptical wheels (61) are axially arranged on the surface of the shaft tube (6), and the angle difference between the elliptical wheels (61) at adjacent positions is 90°. The plurality of arranged steel belts (4) are aligned and wound around the outside of the elliptical wheels (61), so that the steel belt (4) at the reversing surface is concave inwardly, and the steel belts (4) at adjacent positions are supported by the elliptical wheels (61) to have a reversing angle difference; Two groups of shaft tubes (6) are arranged vertically on the side of the reversing surface, and the surfaces of the two groups of shaft tubes (6) are provided with elliptical wheels (61) in alignment, and the angle difference between the elliptical wheels (61) in alignment on the surfaces of the two groups of shaft tubes (6) is 90°. The steel belt (4) passes around the elliptical wheels (61) on the surfaces of the two groups of shaft tubes (6); An air blowing assembly (3) is disposed outside the box (1), the air blowing assembly (3) is drivingly connected to the motor (2), an air duct (31) parallel to the inner wall of the box (1) is disposed at the bottom of the box (1), an exhaust end of the air blowing assembly (3) is connected to the air duct (31), and an exhaust port (12) is disposed at the top of the box (1). The elliptical wheel (61) and the surface of the shaft tube (6) are provided with a plurality of air holes (64) penetrating the inner cavity of the shaft tube (6); the exhaust end of the air blowing assembly (3) is connected to the inner cavity of the shaft tube (6); A core tube (62) is arranged inside the two shaft tubes (6), the core tube (62) is fixed to the box body (1), and an axially extending strip (63) is opened on the surface of the core tube (62), the strip (63) on the surface of the upper core tube (62) is aligned with the PAA film (5) at the corner of the horizontal bearing surface and the reversing surface, and the strip (63) on the surface of the lower core tube (62) is aligned with the PAA film (5) inside the reversing surface; The belt roller (41) of the reversing surface is vertically aligned so that the PAA film (5) at the reversing surface is vertically conducted downwards. A touch roller (7) is rotated at the reversing surface inside the box (1), and the touch roller (7) contacts the PAA film (5) that is conducted downwards.

2. The polyimide film colloid stripping device according to claim 1, characterized in that: A protruding belt strip (43) is fixed to the surface of the steel belt (4) contacting the belt roller (41), and a belt groove (42) is provided on the surface of the steel belt (4), and the belt strip (43) is adapted to be pressed into the belt groove (42).

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