A corona treatment device for BOPET film production

Abstract

The present invention relates to the technical field of BOPET film production and processing, and specifically discloses a corona treatment device for BOPET film production, comprising a device seat, wherein a film roller and a winding roller are respectively installed at the front and rear of the device seat, two guide rollers are arranged between the film roller and the winding roller, the two guide rollers are installed in the device seat, and two corona rollers are arranged on the upper side between the two guide rollers, and the two corona rollers are installed in the device seat, and a corona mechanism is arranged on the upper side between the two corona rollers. The corona mechanism designed by the present invention adjusts the intensity of the high-voltage AC electric field by increasing or decreasing the return of the conductive fine wire in the corona seat, and cooperates with multiple discharge electrodes on the spacing seat to stably control the number and spacing of electrodes, ensure uniform electric field distribution, and adjust the electrode distribution form to adapt to different corona treatment intensities according to the thickness of different film characteristics, so as to have excellent electric field regulation ability and avoid regional differences in treatment.

Description

Technical Field

[0001] The invention relates to the technical field of BOPET film production and processing, in particular to a corona treatment device for BOPET film production. Background Art

[0002] BOPET film, or biaxially oriented polyester film, is a plastic film widely used in packaging and industrial fields. BOPET film has excellent mechanical properties, such as high strength, abrasion resistance and tear resistance, excellent optical properties, including high transparency and excellent gloss, good chemical stability, chemical corrosion resistance and high temperature resistance. Due to its excellent printability and high-quality surface properties, BOPET film can be used for the outer layer of packaging to enhance the appearance texture and printing effect of the packaging.

[0003] Untreated plastic surfaces (such as BOPET) have low surface energy, and coatings or inks are difficult to adhere to the surface evenly, and are prone to falling off or uneven problems. Corona treatment of BOPET film is a common surface treatment method used to enhance the adhesion and printability of the film surface and improve the adhesion of the coating. This treatment method is widely used in packaging, printing and industrial applications to ensure the reliability and quality of products during production and use.

[0004] However, in the actual corona treatment process of the film, there is a situation of uneven film surface treatment. This is because the type characteristics and thickness of the film are different, the size of the corona AC electric field required is also different, and the motor design in the corona system is not reasonable enough, the electric field distribution is uneven, and the electrode spacing cannot be quickly and adaptively adjusted, resulting in inconsistent treatment effects on the film surface and regional differences. Therefore, the present invention proposes a corona treatment device for BOPET film production to solve the problems mentioned in the above background technology. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a corona treatment device for BOPET film production.

[0006] In order to achieve the above-mentioned object, the present invention adopts the following technical scheme: a corona treatment device for BOPET film production, comprising a device seat, wherein a film roller and a winding roller are respectively installed at the front and rear of the device seat, two guide rollers are arranged between the film roller and the winding roller, the two guide rollers are installed in the device seat, and two corona rollers are arranged on the upper side between the two guide rollers, and the two corona rollers are installed in the device seat, and a corona mechanism is arranged on the upper side between the two corona rollers;

[0007] The corona mechanism includes a corona seat, one side of the corona seat is rotatably connected to the device seat, a number of fixed guide wheels are evenly installed on both sides of the surface of the corona seat, and a number of adjustment seats are arranged on both the left and right sides of the corona seat, and the aforenamed adjustment seats and the fixed guide wheels are distributed alternately;

[0008] An activity guide wheel is installed on the surface of the adjustment seat, and a matching guide wheel installed on the adjustment seat is arranged outside the activity guide wheel. A number of spacing seats are evenly arranged on the lower side of the corona seat. A clamping seat is rotatably connected to the lower side of the spacing seat. A number of discharge electrodes are evenly arranged on the lower side of the clamping seat. Two wire winding columns are arranged at one end of the lower side of the corona seat. A conductive thin wire is connected between the two wire winding columns. The conductive thin wire respectively bypasses the fixed guide wheels and the activity guide wheels on both sides, and the conductive thin wire passes through between a number of spacing seats and the clamping seat. The bent and folded conductive thin wire cooperates with the discharge electrode to form a corona high-voltage alternating current electric field with controllable spacing.

[0009] Preferably, a number of activity guide rails corresponding to the adjustment seats are arranged inside the corona seat, and the activity guide rails are rotatably connected to the corona seat, and a torsion spring is arranged at the connection between the activity guide rails and the corona seat.

[0010] Preferably, a cylinder is movably connected to the lower side of the adjustment seat, and an activity clamping block is fixed to the lower end of the cylinder. A limit rotating block corresponding to the activity clamping block is rotatably connected to one end inside the activity guide rail. A protrusion for restricting the rotation of the limit rotating block is arranged on the lower side of the activity guide rail. A torsion spring is arranged at the connection between the limit rotating block and the activity guide rail, and a notch corresponding to the activity clamping block is arranged at the outer end of the activity guide rail.

[0011] Preferably, a number of abutting blocks corresponding to the activity guide rails are arranged inside the corona seat. The abutting blocks slide left and right between the activity guide rails and the corona seat, and a compression spring is arranged inside between the abutting blocks and the corona seat.

[0012] Preferably, a number of corresponding wire threading grooves are opened on the inner sides of the spacing seats and the clamping seats, and a current-carrying sheet is fixed in the wire threading grooves. The current-carrying sheet inside the clamping seat is electrically connected to the corresponding discharge electrode outside.

[0013] Preferably, the spacing seats slide left and right on the corona seat, and a torsion spring is arranged at the connection between the clamping seat and the spacing seat.

[0014] Preferably, positioning blocks are rotatably connected to both ends of the spacing seat, and a torsion spring is arranged at the connection between the positioning blocks and the spacing seat. Locking buckles are connected to both sides of the outer end of the clamping seat, and limiting blocks corresponding to the locking buckles are arranged on both sides of the outer end of the spacing seat.

[0015] Preferably, an inverted U-shaped frame fixed to the device seat is arranged on the upper side between the take-up roller and the rear guiding roller. A rotating seat is rotatably connected to the middle of the inverted U-shaped frame, and a torsion spring is arranged at the connection between the rotating seat and the inverted U-shaped frame;

[0016] Two electrostatic rods are connected to the lower side of the rotating seat. The two electrostatic rods are located above the two sides of the shaped frame, and gears are fixed to the inner ends of the two electrostatic rods, and the two gears are meshed with each other.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. The corona mechanism designed by the present invention can increase or decrease the number of turns of the conductive thin wire in the corona seat, adjust the intensity of the high voltage AC electric field, cooperate with the discharge electrodes on the several spacing seats thereon, and achieve stable control of the number and spacing of electrodes, while ensuring uniform electric field distribution. According to the characteristic thickness of the film, the electrode distribution form adapted to the corona treatment intensity is adjusted, so that the electrode system has good electric field regulation ability, regional differences can be avoided, and the uniformity of the treatment effect is improved;

[0018] 2. The present invention designs a corona mechanism, wherein the movable guide rail and the corresponding adjustment seat structure can realize the rapid adjustment and fixation of the guide wheel position on the adjustment seat, and cooperate with the movable spacing seat structure to quickly obtain the electrode distribution state required for the actual treatment of the film. Compared with the traditional fixed single corona system, the present corona mechanism is not only flexible, has a wide range of applications, but also has rapid and reliable adjustment. In combination with strict control of electrode treatment parameters, such as voltage, frequency, etc., it can achieve a consistent corona treatment effect on the film surface;

[0019] In summary, the corona mechanism designed in the present invention adjusts the high-voltage AC electric field strength by increasing or decreasing the return of the conductive fine wire in the corona seat, and cooperates with the multiple discharge electrodes on the spacing seat to stably control the number and spacing of the electrodes to ensure uniform electric field distribution. According to the thickness of different film characteristics, the electrode distribution pattern is adjusted to adapt to different corona treatment intensities, thereby having excellent electric field regulation capabilities, avoiding regional differences in treatment, and improving the uniformity of treatment effects. The static electricity elimination structure of the electrostatic rod designed in addition can adapt the distribution angle of the electrostatic rod according to the corona intensity to ensure that the electrostatic rod achieves the best static electricity removal effect under specific conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural schematic diagram of a corona treatment device for BOPET film production proposed by the present invention;

[0021] Figure 2 A side cross-sectional structural schematic diagram of a corona treatment device for BOPET film production proposed by the present invention;

[0022] Figure 3 This is a schematic diagram of the front structure of a corona treatment device for BOPET film production proposed by the present invention;

[0023] Figure 4A schematic diagram of the structure of the corona mechanism in a corona treatment device for BOPET film production proposed by the present invention Figure 1 ;

[0024] Figure 5 A schematic diagram of the structure of the corona mechanism in a corona treatment device for BOPET film production proposed by the present invention Figure 2 ;

[0025] Figure 6 A schematic diagram of the structure of the corona mechanism in a corona treatment device for BOPET film production proposed by the present invention Figure 3 ;

[0026] Figure 7 A schematic diagram of the structure of the corona mechanism in a corona treatment device for BOPET film production proposed by the present invention Figure 4 ;

[0027] Figure 8 This is a schematic diagram of the connection structure of a spacing seat in a corona treatment device for BOPET film production proposed by the present invention.

[0028] In the figure: 1. Device seat; 2. Film roller; 3. Winding roller; 4. Guide roller; 5. Corona roller;

[0029] 6. Corona mechanism; 601. Corona seat; 602. Conductive thin wire; 603. Discharge electrode; 604. Spacing seat; 605. Clamp seat; 606. Current-carrying sheet; 607. Positioning block; 608. Lock buckle; 609. Limit block; 610. Adjustment seat; 611. Fixed guide wheel; 612. Movable guide wheel; 613. Matching guide wheel; 614. Movable guide rail; 615. Stop block; 616. Extrusion spring; 617. Winding column; 618. Limiting rotating block; 619. Movable clamping block;

[0030] 7. Frame; 8. Rotating stand; 9. Static electric stick. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0032] Reference Figure 1-8A corona treatment device for BOPET film production comprises a device seat 1, a film roller 2 and a winding roller 3 are respectively installed at the front and rear of the device seat 1, two guide rollers 4 are arranged between the film roller 2 and the winding roller 3, the two guide rollers 4 are installed in the device seat 1, and two corona rollers 5 are arranged on the upper side between the two guide rollers 4, and the two corona rollers 5 are installed in the device seat 1, a corona mechanism 6 is arranged on the upper side between the two corona rollers 5, the front and rear corona rollers 5 provide path conditions for the upper corona mechanism 6 to perform corona treatment on the film passing through, the front film roller 2 unwinds the film, and the rear winding roller 3 is connected with an active device to wind up the film;

[0033] Furthermore, reference Figure 4 , 6 The corona mechanism 6 includes a corona seat 601, one side of the corona seat 601 is rotatably connected to the device seat 1, a plurality of fixed guide wheels 611 are evenly installed on both sides of the surface of the corona seat 601, and a plurality of adjustment seats 610 are arranged on both sides of the corona seat 601, and the plurality of adjustment seats 610 and the fixed guide wheels 611 are staggered, a plurality of movable guide rails 614 corresponding to the adjustment seats 610 are arranged in the corona seat 601, and the movable guide rails 614 are rotatably connected to the corona seat 601, and a movable guide wheel 612 is installed on the surface of the adjustment seat 610 , and a matching guide wheel 613 installed on the adjustment seat 610 is arranged on the outer side of the movable guide wheel 612, a plurality of spacing seats 604 are evenly arranged on the lower side of the corona seat 601, a clamping seat 605 is connected to the lower side of the spacing seat 604, and a plurality of discharge electrodes 603 are evenly arranged on the lower side of the clamping seat 605. Two winding posts 617 are arranged at one end of the lower side of the corona seat 601, and a conductive thin wire 602 is connected between the two winding posts 617. The conductive thin wire 602 bypasses the fixed guide wheels 611 and the movable guide wheel 612 on both sides respectively, and the conductive thin wire 602 passes through the plurality of spacing seats 604 and the clamping seat 605. The bent and folded conductive thin wire 602 cooperates with the discharge electrode 603 to form a corona high-voltage AC electric field with controllable spacing. After the conductive thin wire 602 is bent, the winding post 617 can be restricted from rotating so that it no longer rotates and tightens the adjusted conductive thin wire 602;

[0034] Furthermore, reference Figure 4 , 8, the conductive thin wire 602 bypasses several fixed guide wheels 611 and movable guide wheels 612 on the corona seat 601 to form several sections of reciprocating bending corona fields, and by sliding the adjustment seat 610 in the movable guide rail 614, the position of the adjustment seat 610 and the movable guide wheel 612 thereon is changed, so that the bending of the conductive thin wire 602 passing through is increased or reduced, and the inner sides of the spacing seat 604 and the clamp seat 605 are provided with several corresponding threading grooves, and the threading grooves are fixed with power-carrying sheets 606, and the power-carrying sheets 606 in the clamp seat 605 are electrically connected to the corresponding discharge electrodes 603 on the outside. When the number of bending line segments is more, the AC electric field is stronger, and vice versa, the AC electric field is smaller, and the actual corona effect is also different. The specific distribution of the conductive thin wire 602 depends on the type, characteristics and thickness of the film;

[0035] Furthermore, reference Figure 5 , 7 A torsion spring is provided at the junction of the movable guide rail 614 and the corona seat 601, a cylinder is movably connected to the lower side of the adjustment seat 610, and a movable clamping block 619 is fixed to the lower end of the cylinder, a limit rotating block 618 corresponding to the movable clamping block 619 is connected to one end of the inner part of the movable guide rail 614, a protrusion for limiting the rotation of the limit rotating block 618 is provided on the lower side of the movable guide rail 614, and a torsion spring is provided at the junction of the limit rotating block 618 and the movable guide rail 614, and a notch corresponding to the movable clamping block 619 is provided at the outer end of the movable guide rail 614, After the adjustment seat 610 in the corona seat 601 is removed from the movable guide rail 614, the movable guide rail 614 in the corona seat 601 is turned downward, and the movable block 619 on the lower side of the adjustment seat 610 is pulled downward, rotated at a 90-degree angle, and corresponds to the notch at the outer end of the downwardly rotated movable guide rail 614. After the movable guide rail 614 is released, the outer end of the movable guide rail 614 is tightly attached to the lower side of the rotated movable block 619 due to the action of the torsion spring, which plays a role in limiting the adjustment seat 610 inside the corona seat 601.

[0036] Furthermore, when it is necessary to slide the adjustment seat 610 into the movable guide rail 614 to increase the return of the conductive thin wire 602, the above-mentioned movable block 619 can be reset, and the movable guide rail 614 is released from the restriction and is pressed against the lower side of the corona seat 601 by the torsion spring. The movable guide rail 614 is flush with the surface of the corona seat 601, and the adjustment seat 610 slides into the corresponding movable guide rail 614 until it slides into the innermost end of the movable guide rail 614 and squeezes through the limit rotating block 618 on the lower side of the movable guide rail 614. When the adjustment seat 610 passes completely, the limit rotating block 618 will automatically rotate back, and the corona A plurality of stoppers 615 corresponding to the movable guide rail 614 are arranged inside the seat 601, and the stoppers 615 slide left and right between the movable guide rail 614 and the corona seat 601, and an extrusion spring 616 is arranged inside the stoppers 615 and the corona seat 601, and the stoppers 615 located at the innermost end of the movable guide rail 614 are subjected to the elastic force of the rear extrusion spring 616, which will squeeze the sliding adjustment seat 610, so that the adjustment seat 610 is closely attached to the rotating stoppers 615, thereby locking the adjustment seat 610 sliding into the movable guide rail 614, and thereby fixing the position of the movable guide wheel 612 on the adjustment seat 610;

[0037] Furthermore, reference Figure 8 , the spacing seat 604 slides left and right on the corona seat 601, and a torsion spring is provided at the junction of the clamp seat 605 and the spacing seat 604, both ends of the spacing seat 604 are rotatably connected with positioning blocks 607, and a torsion spring is provided at the junction of the positioning block 607 and the spacing seat 604. Accordingly, according to the type characteristics and thickness of the film, the number and distribution position of the energized spacing seats 604 also need to be carefully considered, the clamp seat 605 on the spacing seat 604 is turned off, and the conductive thin wire 602 passes through the corresponding threading groove and contacts the energized sheet 606 in the threading groove;

[0038] Furthermore, after adjusting the left and right positions of the spacing seat 604 on the corona seat 601, the clamp seat 605 on the spacing seat 604 is turned flat, and the outer ends of the clamp seat 605 are connected with lock buckles 608 on both sides, and the outer ends of the spacing seat 604 are provided with limit blocks 609 corresponding to the lock buckles 608 on both sides, and the lock buckles 608 and the limit block 609 structures on both sides of the outer ends are used to complete the locking of the clamp seat 605 on the spacing seat 604. Since the clamp seat 605 is flat against the surface of the spacing seat 604, the positioning blocks 607 at both ends thereof are squeezed and rotated, and the lower ends of the positioning blocks 607 are tightly against and squeezed on the surface of the corona seat 601, thereby realizing the relative fixation of the position of the corona mechanism 6 on the corona seat 601;

[0039] Furthermore, reference Figure 1, above the middle of the winding roller 3 and the rear guiding roller 4, there is a C-shaped frame 7 fixed to the device base 1. A rotating seat 8 is rotatably connected in the middle of the C-shaped frame 7, and a torsion spring is arranged at the connection between the rotating seat 8 and the C-shaped frame 7. Two static electricity bars 9 are rotatably connected to the lower side of the rotating seat 8. The two static electricity bars 9 are located above both sides of the C-shaped frame 7, and gears are fixed to the inner ends of the two static electricity bars 9, and the two gears are meshed with each other. Since the plasma generated during the corona treatment process will cause the surface to be charged, there are usually short-term excess negative charges. The left and right static electricity bars 9 provided can eliminate the static electricity on the film surface. Similarly, according to the actual intensity of the front corona field, the quantity of subsequent negative charges can be judged, and the unfolding angle of the static electricity bars 9 can be adjusted to ensure that the static electricity bars 9 achieve the best static electricity elimination effect under specific conditions. The actual adjustment operation is as follows: turn up the rotating seat 8 on the C-shaped frame 7, and then directly rotate and adjust the angle of the static electricity bars 9. After confirmation, let go of the rotating seat 8, so that the two static electricity bars 9 are pressed against both sides of the C-shaped frame 7 under the action of the torsion spring, playing a role in fixing the position and angle of the static electricity bars 9 after adjustment.

[0040] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A corona treatment device for BOPET film production, comprising a device base (1), characterized in that: A film roller (2) and a winding roller (3) are respectively installed at the front and rear of the device seat (1), two guide rollers (4) are arranged between the film roller (2) and the winding roller (3), the two guide rollers (4) are installed in the device seat (1), and two corona rollers (5) are arranged on the upper side between the two guide rollers (4), and the two corona rollers (5) are installed in the device seat (1), and a corona mechanism (6) is arranged on the upper side between the two corona rollers (5), and the corona mechanism (6) comprises a corona seat (601), one side of the corona seat (601) is rotatably connected to the device seat (1), a plurality of fixed guide wheels (611) are evenly installed on both sides of the surface of the corona seat (601), and a plurality of adjustment seats (610) are arranged on both sides of the left and right sides of the corona seat (601), and the plurality of adjustment seats (610) and the fixed guide wheels (611) are staggered; A movable guide wheel (612) is installed on the surface of the adjustment seat (610), and a matching guide wheel (613) installed on the adjustment seat (610) is arranged outside the movable guide wheel (612); a plurality of spacing seats (604) are evenly arranged on the lower side of the corona seat (601); a clamping seat (605) is connected to the lower side of the spacing seat (604); a plurality of discharge electrodes (603) are evenly arranged on the lower side of the clamping seat (605); two winding posts (617) are arranged at one end of the lower side of the corona seat (601); a conductive thin wire (602) is connected between the two winding posts (617); the conductive thin wire (602) respectively passes around the fixed guide wheels (611) and the movable guide wheel (612) on both sides; the conductive thin wire (602) passes through the plurality of spacing seats (604) and the clamping seat (605); A plurality of movable guide rails (614) corresponding to the adjustment seat (610) are arranged inside the corona seat (601), and the movable guide rails (614) are rotatably connected to the corona seat (601), and a torsion spring is arranged at the transition point between the movable guide rails (614) and the corona seat (601); a cylinder is movably connected to the lower side of the adjustment seat (610), and a movable clamping block (619) is fixed at the lower end of the cylinder; a limit rotating block (618) corresponding to the movable clamping block (619) is transferred to one end inside the movable guide rail (614), a protrusion for limiting the rotation of the limit rotating block (618) is arranged on the lower side of the movable guide rail (614), and a torsion spring is arranged at the transition point between the limit rotating block (618) and the movable guide rail (614); Inside the corona seat (601), there are several abutting blocks (615) corresponding to the movable guide rail (614). The abutting blocks (615) slide left and right between the movable guide rail (614) and the corona seat (601), and an extrusion spring (616) is arranged inside between the abutting blocks (615) and the corona seat (601). A number of corresponding wire passing grooves are provided on the inner sides of the spacing seat (604) and the clamping seat (605), and electric conduction pieces (606) are fixed in the wire passing grooves. The electric conduction pieces (606) inside the clamping seat (605) are electrically connected to the corresponding discharge electrodes (603) on the outside. The spacing seat (604) slides left and right on the corona seat (601), and a torsion spring is arranged at the connection between the clamping seat (605) and the spacing seat (604). Positioning blocks (607) are rotatably connected to both ends of the spacing seat (604), and torsion springs are arranged at the connections between the positioning blocks (607) and the spacing seat (604). Locking buckles (608) are connected to both sides of the outer end of the clamping seat (605), and limiting blocks (609) corresponding to the locking buckles (608) are arranged on both sides of the outer end of the spacing seat (604).

2. The corona treatment device for BOPET film production according to claim 1, characterized in that: Above the middle of the winding roller (3) and the rear guiding roller (4), there is a U-shaped frame (7) fixed on the device base (1). A rotating seat (8) is rotatably connected in the middle of the U-shaped frame (7), and a torsion spring is arranged at the connection between the rotating seat (8) and the U-shaped frame (7); Two static electricity bars (9) are connected to the lower side of the rotating seat (8). The two static electricity bars (9) are located above both sides of the U-shaped frame (7), and gears are fixed to the inner ends of the two static electricity bars (9), and the two gears are meshed with each other.

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