Roll-to-roll PET pressure-sensitive adhesive film double-sided UV curing production line

Abstract

The invention relates to the technical field of pressure-sensitive adhesive film production, and discloses a roll-to-roll PET pressure-sensitive adhesive film double-sided UV curing production line, which comprises an assembly frame, and the assembly frame is sequentially provided with an unreeling roller, a UV curing roller, a UV curing roller, a UV curing roller and a UV curing roller from top to bottom in the vertical direction, and the unreeling roller is used for continuously releasing a PET pressure-sensitive adhesive base material; the straightening assembly comprises two groups of fixed rollers and two groups of movable rollers which are arranged in the vertical direction of the assembly frame, and the two groups of movable rollers are synchronously driven in the horizontal direction and are used for keeping perpendicularity calibration in the feeding process of the PET pressure-sensitive adhesive base material; according to the scheme, the double-sided UV curing assembly driven in a reciprocating mode is adopted, a guide plate switching mechanism is combined to enable the scraper to automatically complete separation and pressing actions in the ascending and descending process, frequent positioning and leveling are not needed in the high-speed movement process, high-precision equipment is not needed, the requirements for the tensioning mechanism, the scraper mechanism and the UV curing mechanism are lower, and the production efficiency is improved. And redundant glue is recycled by utilizing the spiral blade, so that the thickness and uniformity of glue layers on the two surfaces and the consistency of curing conditions are accurately controlled when the two surfaces of the PET pressure-sensitive adhesive film are synchronously coated.

Description

Technical Field

[0001] The present invention relates to the technical field of the production of pressure-sensitive adhesive films, in particular to a roll-to-roll double-sided UV curing production line for PET pressure-sensitive adhesive films. Background Art

[0002] PET (polyethylene terephthalate) pressure-sensitive adhesive film is a functional composite material with a PET film as the base material and a pressure-sensitive adhesive coated on the surface. Based on the high mechanical strength, heat resistance, transparency, and dimensional stability of the PET base material, combined with the viscoelastic properties of the pressure-sensitive adhesive, rapid adhesion can be achieved under slight pressure and persistent adhesion can be maintained.

[0003] Currently, during the production process of double-sided PET pressure-sensitive adhesive films, after single-sided coating is completed, the base material needs to be flipped for reverse coating. During the flipping process, the uncompletely cured adhesive layer may contact the guide roller or the equipment, causing contamination. If the two-sided adhesive layers are coated synchronously, however, due to the increased weight of the film after coating in the traditional horizontal conveying production line of pressure-sensitive adhesive films, inevitable production differences occur between the upper and lower sides due to the factor of sinking under its own gravity. For example, uncured glue droplets drip from the lower side of the base material or glue accumulates on the upper side of the base material. It is necessary to repeatedly unwind and rewind to adjust the position of the base material and process it, which requires higher requirements for the tensioning mechanism, doctor blade mechanism, and UV curing mechanism. It is difficult to meet the precise control of the adhesive layer thickness, uniformity, and the consistency of curing conditions on both sides during the synchronous coating of both sides of the PET pressure-sensitive adhesive film, and it is even more difficult to ensure the production efficiency. Summary of the Invention

[0004] The purpose of the present invention is to provide a roll-to-roll double-sided UV curing production line for PET pressure-sensitive adhesive films, aiming to solve the consistency problem that the traditional PET pressure-sensitive adhesive film production line is difficult to meet during synchronous coating and curing on both sides.

[0005] The present invention is realized as follows. The roll-to-roll double-sided UV curing production line for PET pressure-sensitive adhesive films includes an assembly frame, which is successively provided from top to bottom in the vertical direction with: An unwind roller for continuously releasing the PET pressure-sensitive adhesive base material; A straightening assembly, including two groups of fixed rollers and moving rollers arranged along the vertical direction of the assembly frame. The two groups of moving rollers are synchronously driven in the horizontal direction for maintaining the perpendicularity calibration of the PET pressure-sensitive adhesive base material during the feeding process; A guide roller for guiding the folding of the feeding path of the PET pressure-sensitive adhesive base material; Two groups of compound rollers, arranged symmetrically above and below the PET pressure-sensitive adhesive base material, for synchronously thermocompounding the release film on both sides of the PET pressure-sensitive adhesive base material; A winding roller for winding the pressure-sensitive adhesive finished film after compounding; A double-sided treatment unit, including: The UV curing assembly includes curing shells oppositely arranged on both sides of the PET pressure-sensitive adhesive substrate. The working surfaces of the two curing shells are integrally provided with, from top to bottom: a plasma pretreatment assembly, a plurality of horizontally distributed coating nozzles, a doctor blade assembly, and a curing lamp holder; A reciprocating assembly for driving the two groups of UV curing assemblies to perform bidirectional linear motion synchronously along the traveling direction of the PET pressure-sensitive adhesive substrate; A guiding assembly includes outer guide plates and inner guide plates distributed on both sides of the curing shell. The guide heads arranged on both sides of the curing shell respectively form sliding pairs with the outer guide plates and the inner guide plates during reciprocation, and dynamically maintain a set distance between the curing shell and the PET pressure-sensitive adhesive substrate during reciprocating motion.

[0006] Preferably, the straightening assembly further includes a straightening telescoping machine horizontally installed at the rear of the assembly frame. Its telescoping part is connected with a C-shaped sliding frame. The two moving rollers are respectively connected through the rotating shafts at the ends of the sliding frame, and the two fixed rollers are respectively connected through rotating shafts to the assembly frame in the traveling direction of the moving rollers.

[0007] Preferably, the guiding assembly further includes a fixing frame. Both the upper and lower parts on both sides of the fixing frame are connected with adjusting rods through rotating shafts, and the four adjusting rods are synchronously driven by an adjusting motor belt; Both ends of the adjusting rod are sleeved with connecting blocks externally. The upper and lower parts of the outer guide plates and the inner guide plates distributed on both sides of the curing shell are fixed through the connecting blocks on one side of the fixing frame, and a cross frame is further arranged between the outer guide plates on both sides of the curing shell.

[0008] Preferably, the two ends of the adjusting rod are respectively provided with a forward thread and a reverse thread, and threaded grooves meshing with the forward thread and the reverse thread are respectively opened inside the connecting blocks at both ends; The adjusting rod is used to adjust the distance between the outer guide plates on the outer sides of the two curing shells.

[0009] Preferably, the cross-section of the outer guide plate on one side of the curing shell is C-shaped, and the lower end of the outer guide plate is longer than the upper end; The lower end of the inner guide plate on one side of the curing shell is connected with a retaining piece through a spring shaft, and a limiting block is further arranged on the inner guide plate. The limiting block is used to limit the rotation of the retaining piece towards the outer guide plate.

[0010] Preferably, the reciprocating assembly further includes a reciprocating telescoping machine vertically installed on the surface of the assembly frame. The telescoping part of the reciprocating telescoping machine is connected with a fixing plate, and both sides of the fixing plate are installed with vertically arranged opening and closing brackets; Two vertically distributed guide rails are further arranged on the surface of the assembly frame, and sliding blocks sliding on the guide rails are installed on the fixing plate.

[0011] Preferably, guide rods are fixedly installed on both of the opening and closing brackets, and springs are sleeved outside the guide rods; Guide blocks are respectively arranged on both sides of the top of the two curing shells. The guide rods penetrate through the guide blocks on one side of the two curing shells, and both ends of the springs abut against the two guide blocks respectively.

[0012] Preferably, electromagnetic solenoid valves are respectively arranged on several of the coating spray heads. The lower part of the curing lamp holder is inclined, and several LED-UV lamps are evenly distributed on the surface of the curing lamp holder. A lamp cover is also clamped outside the inclined part of the curing lamp holder; The scraper assembly includes a scraper bolted below the coating spray head. The cross-section of the scraper is semicircular and includes a leveling part arranged vertically and a glue-returning part arranged in an arc shape.

[0013] Preferably, the scraper assembly further includes a transmission shaft connected to the inside of the glue-returning part through a bearing, and spiral pushing blades are arranged outside the transmission shaft; A ratchet is coaxially installed on the guide head, and a driving wheel is unidirectionally driven by the ratchet. The wheel shaft of the driving wheel is connected to the transmission shaft through a belt drive.

[0014] Preferably, positioning sensors are arranged between the working surfaces of the two curing shells. One of the curing shells is an infrared signal sending end, and the other curing shell is an infrared signal receiving end.

[0015] The beneficial effects of the disclosed roll-to-roll PET pressure-sensitive adhesive film double-sided UV curing production line of the present invention are as follows: 1. By vertically arranging and integrating the unwinding, straightening, plasma pretreatment, intelligent coating, dynamic scraping, UV curing, and compound winding modules, this solution can avoid the problems caused by gravity factors during traditional coating and curing, and achieve efficient continuous production operations; 2. This solution adopts a reciprocating-driven double-sided UV curing assembly, combined with a guide plate switching mechanism, enabling the scraper to automatically complete the detachment and pressing actions during the up and down movements. During the high-speed movement process, there is no need for frequent positioning and leveling, and there is no need to rely on high-precision equipment, with lower requirements for the tensioning mechanism, scraper mechanism, and UV curing mechanism. The spiral blades are used to recover the excess glue to meet the precise control of the glue layer thickness, uniformity, and curing condition consistency on both sides of the PET pressure-sensitive adhesive film during simultaneous coating on both sides; 3. The synchronous adjustment system dynamically controls the coating thickness and curing distance through sensor feedback. Combined with the inclined LED-UV low-temperature curing technology, while improving the double-sided coating uniformity and adhesion, it avoids the thermal deformation of the substrate, solving the problems of large pollution and unstable quality in the traditional process. Description of the Drawings

[0016] Figure 1It is a schematic diagram of a roll-to-roll double-sided UV curing production line for PET pressure-sensitive adhesive film provided by an embodiment of the present invention; Figure 2 It is a rear schematic view of a roll-to-roll double-sided UV curing production line for PET pressure-sensitive adhesive film provided by an embodiment of the present invention; Figure 3 It is a partial schematic diagram of a roll-to-roll double-sided UV curing production line for PET pressure-sensitive adhesive film provided by an embodiment of the present invention; Figure 4 It is a schematic diagram of another perspective of a part of a roll-to-roll double-sided UV curing production line for PET pressure-sensitive adhesive film provided by an embodiment of the present invention; Figure 5 It is a schematic diagram of a guiding component of a roll-to-roll double-sided UV curing production line for PET pressure-sensitive adhesive film provided by an embodiment of the present invention; Figure 6 It is a roll-to-roll double-sided UV curing production line for PET pressure-sensitive adhesive film provided by an embodiment of the present invention Figure 5 Partial structure schematic diagram; Figure 7 It is a schematic diagram of a straightening component of a roll-to-roll double-sided UV curing production line for PET pressure-sensitive adhesive film provided by an embodiment of the present invention; Figure 8 It is a partial schematic diagram of a UV curing component of a roll-to-roll double-sided UV curing production line for PET pressure-sensitive adhesive film provided by an embodiment of the present invention; Figure 9 It is a roll-to-roll double-sided UV curing production line for PET pressure-sensitive adhesive film provided by an embodiment of the present invention Figure 8 Partial internal view structure schematic diagram; Figure 10 It is a side view schematic diagram of a curing shell of a roll-to-roll double-sided UV curing production line for PET pressure-sensitive adhesive film provided by an embodiment of the present invention; Figure 11 It is a roll-to-roll double-sided UV curing production line for PET pressure-sensitive adhesive film provided by an embodiment of the present invention Figure 10 Partial enlarged structure schematic diagram at position A in the middle.

[0017] Legend description: 1. Assembly frame; 2. Unwinding roller; 3. Rewinding roller; 4. PET pressure-sensitive adhesive substrate; 5. Straightening component; 6. Guiding component; 7. Reciprocating component; 8. UV curing component; 11. Guide roller; 12. Release film; 13. Composite roller; 51. Straightening telescoping machine; 52. Slide carriage; 53. Fixed roller; 54. Movable roller; 61. Fixed frame; 62. Adjusting motor; 63. Adjusting rod; 64. Connecting block; 65. Outer guide plate; 66. Inner guide plate; 67. Flap; 68. Limit block; 71. Reciprocating telescoping machine; 72. Guide rail; 73. Slide block; 74. Fixed plate; 75. Opening and closing bracket; 76. Guide rod; 77. Spring; 81. Curing housing; 82. Plasma pretreatment assembly; 83. Guide head; 84. Positioning sensor; 85. Electromagnetic solenoid valve; 86. Scraper assembly; 87. Curing lamp holder; 88. Guide block; 831. Ratchet; 832. Driving wheel; 851. Coating nozzle; 861. Scraper; 862. Transmission shaft; 863. Spiral pushing blade; 871. LED-UV lamp; 872. Lamp cover; 8611. Smoothing part; 8612. Glue-returning part. Detailed implementation manners

[0018] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to 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 used to limit the present invention.

[0019] In the drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0020] The implementation of the present invention will be described in detail below with reference to specific embodiments.

[0021] The present solution aims to solve the problem that in a traditional horizontal conveying production line for pressure-sensitive adhesive films, due to the factor of the film sinking under its own gravity after coating, the production difference between the upper and lower surfaces will inevitably occur. This requires higher requirements for the tensioning mechanism, scraper mechanism and UV curing mechanism, and it is difficult to meet the problem of accurately controlling the thickness, uniformity of the adhesive layers on both sides and the consistency of curing conditions when synchronously coating both sides of the PET pressure-sensitive adhesive film.

[0022] In this embodiment: Refer to Figures 1-3 As shown, a preferred embodiment is provided by the present invention.

[0023] The roll-to-roll PET pressure-sensitive adhesive film double-sided UV curing production line of this embodiment includes an assembly rack 1, which is sequentially arranged from top to bottom in the vertical direction as follows: Unwinding roller 2 is used to continuously release the PET pressure-sensitive adhesive substrate 4 and provide real-time feedback on the tension at the unwinding end through a sensor; Straightening assembly 5 includes two groups of fixed rollers 53 and moving rollers 54 arranged along the vertical direction of the mounting frame 1. The two groups of moving rollers 54 are driven synchronously in the horizontal direction to maintain the verticality calibration of the PET pressure-sensitive adhesive substrate 4 during the feeding process. By the synchronous horizontal movement of the two groups of moving rollers 54, a force is applied to one side of the PET pressure-sensitive adhesive substrate 4 to keep the feeding path of the PET pressure-sensitive adhesive substrate 4 vertical and centered relative to the UV curing assembly 8; Guide roller 11 is used for the folding guide of the feeding path of the PET pressure-sensitive adhesive substrate 4; Two groups of composite rollers 13 are arranged symmetrically above and below the PET pressure-sensitive adhesive substrate 4 to synchronously thermocompound the release film 12 on both sides of the PET pressure-sensitive adhesive substrate 4; Rewinding roller 3 is used to wind up the pressure-sensitive adhesive finished film after compounding; Double-sided treatment unit includes: UV curing assembly 8, which includes curing shells 81 arranged oppositely on both sides of the PET pressure-sensitive adhesive substrate 4. The working surfaces of the two curing shells 81 are integrally provided with: a plasma pretreatment assembly 82, a number of horizontally distributed coating nozzles 851, a scraper assembly 86, and a curing lamp holder 87 from top to bottom; The plasma pretreatment assembly 82 generates active particles through atmospheric pressure glow discharge to bombard the surface of the PET pressure-sensitive adhesive substrate 4, which can decontaminate its surface, break the chemical inertness of the PET surface, enhance the chemical bonding with the glue. At the same time, the wettability of the PET surface after plasma pretreatment is improved, the glue is more likely to spread, reducing coating defects and the risk of delamination. The PET plasma pretreatment operation is a well-known prior art in the field and will not be explained here; A number of horizontally distributed coating nozzles 851 are used to coat the surface of the PET pressure-sensitive adhesive substrate 4, and electromagnetic solenoid valves 85 are respectively arranged on the a number of coating nozzles 851, so that each coating nozzle 851 can be independently controlled to work for the supplementary coating operation of uneven coating parts of the PET pressure-sensitive adhesive substrate 4; Scraper assembly 86, the scraper assembly 86 includes a scraper 861 bolted below the coating nozzle 851. The cross-section of the scraper 861 is semicircular and includes a leveling part 8611 arranged vertically and a glue-returning part 8612 arranged in an arc shape. The leveling part 8611 is used to scrape the coating glue on the surface of the PET pressure-sensitive adhesive substrate 4 flat, and the excess glue will flow into the glue-returning part 8612; Reciprocating assembly 7, at Figure 4 and Figure 8It is used to drive the two groups of the UV curing components 8 to perform a two-way linear motion synchronously along the traveling direction of the PET pressure-sensitive adhesive substrate 4; the reciprocating component 7 further includes a reciprocating telescoping machine 71 vertically installed on the surface of the assembly frame 1, a fixed plate 74 is connected to the telescoping part of the reciprocating telescoping machine 71, and two vertically arranged opening and closing brackets 75 are installed on both sides of the fixed plate 74; two vertically distributed guide rails 72 are further arranged on the surface of the assembly frame 1, a slider 73 sliding on the guide rails 72 is installed on the fixed plate 74, and driven by the telescoping part of the reciprocating telescoping machine 71, the UV curing component 8 installed on the fixed plate 74 can reciprocate on the guide rails 72 through the slider 73. Guide rods 76 are fixedly installed on both of the opening and closing brackets 75, and springs 77 are sleeved outside the guide rods 76; guide blocks 88 are respectively arranged on both sides of the top of the two curing shells 81, the guide rods 76 penetrate through the guide blocks 88 on one side of the two curing shells 81, and both ends of the spring 77 abut against the two guide blocks 88 respectively, which enables the two curing shells 81 to slide on the guide rods 76 through the guide blocks 88, and at the same time, due to the action of the spring 77, the outer guide plate 65 and the inner guide plate 66, the two curing shells 81 can always maintain symmetrical and equidistant synchronous movement.

[0024] The guiding component 6 includes an outer guide plate 65 and an inner guide plate 66 distributed on both sides of the curing shell 81. The guide heads 83 arranged on both sides of the curing shell 81 respectively form sliding pairs with the outer guide plate 65 and the inner guide plate 66 during the reciprocating process, and dynamically maintain a set distance between the curing shell 81 and the PET pressure-sensitive adhesive substrate 4 during the reciprocating motion; It should be noted that in Figures 9-11 the doctor blade assembly 86 further includes a transmission shaft 862 bearing-connected in the glue-returning part 8612, and a spiral pushing blade 863 is arranged outside the transmission shaft 862; a ratchet wheel 831 is coaxially installed on the guide head 83, and a driving wheel 832 is unidirectionally driven by the ratchet wheel 831, and the wheel shaft of the driving wheel 832 is connected to the transmission shaft 862 through a belt drive. When the curing shell 81 reciprocates alternately on the outer guide plate 65 and the inner guide plate 66 of the guiding component 6 through the guide head 83, the doctor blade assembly 86 between the two curing shells 81 will perform a clutch movement, and the doctor blade 861 will level the coating layer on the surface of the PET pressure-sensitive adhesive substrate 4 through the leveling part 8611, keep the glue on both sides fully attached to the substrate, and keep the same thickness, and the excess coating glue will be scraped into the glue-returning part 8612; The cross-section of the outer guide plate 65 located on one side of the curing shell 81 is C-shaped, and the lower end of the outer guide plate 65 is longer than the upper end. The lower end of the inner guide plate 66 located on one side of the curing shell 81 is connected to a retaining piece 67 through a spring shaft, and a limiting block 68 is further arranged on the inner guide plate 66, and the limiting block 68 is used to limit the rotation of the retaining piece 67 towards the outer guide plate 65.

[0025] Specifically, referring to Figure 6 As shown, when the curing shell 81 moves downward along the X direction with the guide head 83, due to the action of the spring 77, the two curing shells 81 will be pushed to move away from each other along the Y direction. Therefore, at this time, the guide head 83 will enter between the outer guide plate 65 and the inner guide plate 66 and move downward while adhering to the outer guide plate 65. At this time, the two scraper assemblies 86 do not contact the coating layer on the surface of the PET pressure-sensitive adhesive substrate 4; When the guide head 83 moves downward along the X direction to the end of the outer guide plate 65, it will be squeezed by the bending part at the lower end of the outer guide plate 65, causing the guide head 83 to move along the Y direction. Then, the guide head 83 drives the two scraper assemblies 86 to approach. During the process of the guide head 83 approaching, it will push open the retaining piece 67, and under the action of the spring shaft, the retaining piece 67 will reset, blocking the path for the guide head 83 to return between the outer guide plate 65 and the inner guide plate 66. At this time, when the reciprocating assembly 7 pulls the guide head 83 to move upward along the X direction, it will move along the side of the inner guide plate 66 away from the outer guide plate 65. While keeping the two scraper assemblies 86 in contact with the coating layer on the surface of the PET pressure-sensitive adhesive substrate 4, it moves upward to complete the scraping operation on the coating layer on the surface of the PET pressure-sensitive adhesive substrate 4; During the high-speed movement process, there is no need for frequent positioning and leveling, improving the scraping accuracy and efficiency.

[0026] At the same time, referring to Figure 9 As shown, during the movement of the guide head 83 on the side of the inner guide plate 66 away from the outer guide plate 65, its coaxial ratchet wheel 831 will push the driving wheel 832 to rotate. Then, the driving wheel 832 drives the transmission shaft 862 to rotate through the axle belt. The spiral pushing blade 863 outside the transmission shaft 862 will recover the excess glue that enters the glue return part 8612, avoiding the dripping situation on the surface of the PET pressure-sensitive adhesive substrate 4 due to gravity factors, and also preventing the equipment and the environment from being polluted.

[0027] Moreover, during Figure 5Among them, the guiding component 6 further includes a fixing frame 61. Both the upper and lower parts on both sides of the fixing frame 61 are connected with adjusting rods 63 through rotating shafts. The four adjusting rods 63 are synchronously driven by a belt of an adjusting motor 62. Connecting blocks 64 are sleeved outside both ends of the adjusting rods 63. The upper and lower parts of the outer guide plates 65 and inner guide plates 66 distributed on both sides of the curing shell 81 are fixed through the connecting blocks 64 on one side of the fixing frame 61. A cross frame is further arranged between the outer guide plates 65 on both sides of the curing shell 81. Positive threads and reverse threads are respectively arranged at both ends of the adjusting rod 63, and threaded grooves meshing with the positive threads and reverse threads are respectively opened inside the connecting blocks 64 at both ends thereof. The adjusting rod 63 is used to adjust the distance between the outer guide plates on both sides of the two curing shells 81. When coating PET pressure-sensitive adhesive substrates 4 with different coating layer thickness specifications, the four adjusting rods 63 are driven to rotate synchronously by the belt of the adjusting motor 62, so that the adjusting rod 63 drives the connecting blocks 64 meshing with the positive threads and reverse threads at both ends thereof to achieve reverse synchronous transmission, thereby realizing the adjustment of the distance between the two groups of guide plates, so as to adjust the distance between the two groups of scraper assemblies 86 when moving upward along Figure 6 the X direction of Figure 6 , and the distance between the scraper assemblies 86 is adjusted to realize the function of adjusting the coating layer thickness.

[0028] In this embodiment, referring to Figure 7 as shown, the straightening component 5 further includes a straightening telescoping machine 51 horizontally installed at the rear of the assembly frame 1. Its telescoping part is connected with a C-shaped sliding frame 52. The two moving rollers 54 are respectively connected through the rotating shafts at the ends of the sliding frame 52. The two fixed rollers 53 are respectively connected to the assembly frame 1 in the advancing direction of the moving roller 54 through rotating shafts. By synchronously connecting and driving the moving roller 54 to move horizontally through the sliding frame 52, the PET pressure-sensitive adhesive substrate 4 can be pushed by the moving roller 54 to adjust its vertical part passing through the UV curing component 8 to be centered between the two groups of scraper assemblies 86, reducing the situation that the coating layer pressures on both sides of the PET pressure-sensitive adhesive substrate 4 are inconsistent when scraping and coating the coating layer, and improving the coating uniformity.

[0029] In Figures 8-9 among them, the lower part of the curing lamp holder 87 is inclined, and a plurality of LED-UV lamps 871 are evenly distributed on the surface of the curing lamp holder 87. The inclined plurality of LED-UV lamps 871 can improve the irradiation angle. At the same time, the LED-UV lamps 871 can avoid generating high temperature on the coating layer, reducing the situation that the PET pressure-sensitive adhesive substrate 4 overheats and undergoes deformation. A lamp cover 872 is also clamped outside the inclined part of the curing lamp holder 87; At the same time, positioning sensors 84 are arranged between the working surfaces on both sides of the two curing shells 81. One of the curing shells 81 is an infrared signal sending end, and the other curing shell 81 is an infrared signal receiving end, so as to monitor the distance between the two groups of curing shells 81 in real time and adjust the distance between the two groups of guide plates according to the coating layer thickness.

[0030] This solution integrates the unwinding, straightening, plasma pretreatment, intelligent coating, dynamic scraping, UV curing, and compound winding modules through vertical layout, which can avoid the problems caused by gravity during traditional coating curing and achieve efficient continuous production operations; This solution adopts a reciprocating-driven double-sided UV curing component 8, combined with a guide plate switching mechanism, enabling the scraper 861 to automatically complete the detachment and pressing actions during the up and down movements. During the high-speed movement process, there is no need for frequent positioning and leveling, and no need to rely on high-precision equipment, with lower requirements for the tensioning mechanism, scraper mechanism, and UV curing mechanism. It also uses a spiral blade to recover excess glue to precisely control the glue layer thickness, uniformity, and consistency of curing conditions on both sides during the synchronous coating of both sides of the PET pressure-sensitive adhesive film; The synchronous adjustment system dynamically controls the coating thickness and curing distance through sensor feedback. In combination with the inclined LED-UV low-temperature curing technology, while improving the uniformity and adhesion of double-sided coating, it avoids thermal deformation of the substrate and solves the problems of large pollution and unstable quality in the traditional process.

[0031] Based on the above embodiments, the straightening telescopic machine 51 and the reciprocating telescopic machine 71 can be selected from structures such as cylinders, oil cylinders, motors with lifting rods, etc., and are not limited in this embodiment.

[0032] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. Roll-to-roll PET pressure-sensitive adhesive film double-sided UV curing production line, characterized in that, It includes an assembly rack (1), which is successively provided with the following from top to bottom in the vertical direction: An unwinding roller (2) for continuously releasing the PET pressure-sensitive adhesive substrate (4); A straightening assembly (5), which includes two groups of fixed rollers (53) and moving rollers (54) arranged along the vertical direction of the assembly rack (1). The two groups of moving rollers (54) are synchronously driven in the horizontal direction to keep the verticality calibration of the PET pressure-sensitive adhesive substrate (4) during the feeding process; A guiding roller (11) for guiding the folding of the feeding path of the PET pressure-sensitive adhesive substrate (4); Two groups of compound rollers (13), which are arranged symmetrically above and below the PET pressure-sensitive adhesive substrate (4), and are used to synchronously thermocompound the release film (12) on both sides of the PET pressure-sensitive adhesive substrate (4); A winding roller (3) for winding the pressure-sensitive adhesive finished film after compounding; A double-sided treatment unit, including: A UV curing assembly (8), which includes curing shells (81) arranged oppositely on both sides of the PET pressure-sensitive adhesive substrate (4). The working surfaces of the two curing shells (81) are integrally provided with the following from top to bottom: a plasma pretreatment assembly (82), a plurality of horizontally distributed coating nozzles (851), a scraper assembly (86), and a curing lamp holder (87); A reciprocating assembly (7) for driving the two groups of UV curing assemblies (8) to perform a two-way linear motion synchronously along the traveling direction of the PET pressure-sensitive adhesive substrate (4); A guiding assembly (6), which includes outer guide plates (65) and inner guide plates (66) distributed on both sides of the curing shell (81). The guide heads (83) arranged on both sides of the curing shell (81) respectively form sliding pairs with the outer guide plates (65) and the inner guide plates (66) alternately during the reciprocating process, and dynamically maintain the set distance between the curing shell (81) and the PET pressure-sensitive adhesive substrate (4) during the reciprocating motion.

2. The roll-to-roll PET pressure-sensitive adhesive film double-sided UV curing production line according to claim 1, wherein The straightening assembly (5) further includes a straightening telescoping machine (51) horizontally installed at the rear of the assembly rack (1), and its telescoping part is connected with a C-shaped sliding frame (52). The two groups of moving rollers (54) are respectively connected by the end shafts of the sliding frame (52), and the two fixed rollers (53) are respectively connected by shafts to the assembly rack (1) in the traveling direction of the moving rollers (54).

3. The roll-to-roll PET pressure-sensitive adhesive film double-sided UV curing production line according to claim 1, wherein, The guiding assembly (6) further includes a fixing frame (61), and both the upper and lower parts on both sides of the fixing frame (61) are connected with adjusting rods (63) by shafts. The four adjusting rods (63) are synchronously driven by a belt of an adjusting motor (62); Both ends of the adjusting rod (63) are sleeved with connecting blocks (64) outside. The upper and lower parts of the outer guide plates (65) and the inner guide plates (66) distributed on both sides of the curing shell (81) are fixed by the connecting blocks (64) on one side of the fixing frame (61), and a cross frame is further arranged between the outer guide plates (65) on both sides of the curing shell (81).

4. The roll-to-roll PET pressure-sensitive adhesive film double-sided UV curing production line according to claim 3, characterized in that, Both ends of the adjusting rod (63) are respectively provided with a forward thread and a reverse thread, and the inner parts of the connecting blocks (64) at both ends are respectively provided with thread grooves meshing with the forward thread and the reverse thread; The adjusting rod (63) is used to adjust the distance between the outer guide plates on the outer sides of the two curing shells (81).

5. The roll-to-roll PET pressure-sensitive adhesive film double-sided UV curing production line according to claim 3, wherein The cross-section of the outer guide plate (65) located on one side of the curing shell (81) is C-shaped, and the lower end of the outer guide plate (65) is longer than the upper end. A retaining piece (67) is connected to the lower end of the inner guide plate (66) located on one side of the curing shell (81) through a spring shaft. A limiting block (68) is also arranged on the inner guide plate (66), and the limiting block (68) is used to limit the rotation of the retaining piece (67) towards the outer guide plate (65).

6. The roll-to-roll PET pressure-sensitive adhesive film double-sided UV curing production line according to claim 1, wherein, The reciprocating assembly (7) further includes a reciprocating telescoping machine (71) vertically installed on the surface of the assembly frame (1). The telescoping part of the reciprocating telescoping machine (71) is connected to a fixing plate (74), and vertical opening and closing brackets (75) are installed on both sides of the fixing plate (74). Two vertically distributed guide rails (72) are further arranged on the surface of the assembly frame (1), and sliders (73) sliding on the guide rails (72) are installed on the fixing plate (74).

7. The roll-to-roll PET pressure-sensitive adhesive film double-sided UV curing production line according to claim 6, characterized in that, Guide rods (76) are fixedly installed on both of the opening and closing brackets (75), and springs (77) are sleeved outside the guide rods (76). Guide blocks (88) are respectively arranged on both sides of the tops of the two curing shells (81). The guide rods (76) penetrate through the guide blocks (88) on one side of the two curing shells (81), and both ends of the spring (77) abut against the two guide blocks (88) respectively.

8. The roll-to-roll PET pressure-sensitive adhesive film double-sided UV curing production line according to claim 1, characterized in that, Electromagnetic solenoid valves (85) are respectively arranged on several coating nozzles (851). The lower part of the curing lamp holder (87) is inclined, and a number of LED-UV lamps (871) are evenly distributed on the surface of the curing lamp holder (87). A lamp cover (872) is also clamped on the outer side of the inclined part of the curing lamp holder (87). The doctor blade assembly (86) includes a doctor blade (861) bolted below the coating nozzle (851). The cross-section of the doctor blade (861) is semicircular and includes a leveling part (8611) arranged vertically and a glue-returning part (8612) arranged in an arc shape.

9. The roll-to-roll PET pressure-sensitive adhesive film double-sided UV curing production line according to claim 8, characterized in that, The doctor blade assembly (86) further includes a transmission shaft (862) connected to the glue-returning part (8612) through a bearing, and spiral pushing blades (863) are arranged outside the transmission shaft (862). A ratchet wheel (831) is coaxially installed on the guide head (83), and a driving wheel (832) is unidirectionally driven by the ratchet wheel (831). The wheel shaft of the driving wheel (832) is connected to the transmission shaft (862) through a belt drive.

10. The roll-to-roll PET pressure-sensitive adhesive film double-sided UV curing production line according to claim 1, wherein Position sensors (84) are arranged between the working surfaces of the two curing shells (81). One of the curing shells (81) is an infrared signal sending end, and the other curing shell (81) is an infrared signal receiving end.

Images