Local flow-casting coating device for plastic regenerated alumite hot stamping foil release layer and coating method of local flow-casting coating device

Abstract

The invention relates to the technical field of casting coating, in particular to a local casting coating device for a plastic regenerated alumite hot stamping foil release layer and a coating method thereof.The local casting coating device comprises a support, a protection frame and a fixing plate, the protection frame and the fixing plate are fixed to the support, and a coating head is fixed to the interior of the protection frame; the two-way translation mechanism is arranged on the fixing plate, a deflection assembly is arranged on the two-way translation mechanism, the deflection assembly comprises scraping plates which are symmetrically arranged, and the two-way translation mechanism can drive the two scraping plates to move in the direction close to each other or away from each other through the deflection assembly; the follow-up lifting mechanism is arranged on the fixing plate and connected with the deflection assembly, the follow-up lifting mechanism can adjust the height of the scraper plate through the deflection assembly when the scraper plate translates, controls the scraper plate to execute deflection action, and controls the scraper plate to perform the deflection action by controlling the translation, lifting and deflection action of the scraper plate. And the thickened area on the edge of the material can be stricken.

Description

Technical Field

[0001] The present invention relates to the technical field of overflow coating, and specifically to a local overflow coating device for a release layer of recycled plastic hot stamping foil and a coating method thereof. Background Art

[0002] The release layer of recycled plastic hot stamping foil is a key functional layer in the hot stamping process, and its core function is to achieve precise separation of the pattern and the substrate during hot stamping.

[0003] The release agent is the core material for preparing the release layer, usually composed of silicone compounds, fluorides, polyester compounds, etc. After the release agent is prepared, it can be evenly coated on the surface of the carrier by coating, and a thin and smooth film is formed. After coating, it can be scratched by infrared drying.

[0004] During the coating process, roll coating or spraying methods can be used. However, if the roll coating method is used, roller marks are likely to be formed on the coating surface. If the spraying method is used, there will be a problem of low material utilization rate.

[0005] In this regard, the coating process can be improved by overflow coating. Overflow coating mainly controls the flow of the fluid on the surface of the substrate, which can achieve high-precision coating, high material utilization rate, and reduce material waste. However, during the actual coating process, the edge coating area is prone to edge bulging due to the Marangoni effect (surface tension gradient), forming a "coffee ring" defect at the microscale, and the shear rate distribution is uneven during the overflow process, ultimately resulting in thickening of the coating in the edge area and causing uneven coating. Summary of the Invention

[0006] The purpose of the present invention is to provide a local overflow coating device for a release layer of recycled plastic hot stamping foil and a coating method thereof to solve the problems raised in the above background art.

[0007] To achieve the above purpose, the present invention provides the following technical solutions: A local overflow coating device for a release layer of recycled plastic hot stamping foil, comprising: A bracket, and a protective frame and a fixing plate fixed on the bracket, wherein a coating head is fixed inside the protective frame; It further includes: A bidirectional translation mechanism arranged on the fixing plate, a yaw assembly is arranged on the bidirectional translation mechanism, the yaw assembly includes symmetrically arranged scrapers, and the bidirectional translation mechanism can drive the two scrapers to move towards each other or away from each other through the yaw assembly; The follow-up lifting mechanism is arranged on the fixed plate and connected to the yaw assembly. When the scraper translates, the follow-up lifting mechanism can adjust the height of the scraper through the yaw assembly and control the scraper to perform a yaw action.

[0008] As a further solution of the present invention: The bidirectional translation mechanism includes a second motor fixed on the fixed plate. A bidirectional lead screw connected to the output shaft of the second motor is rotatably installed on the fixed plate. Symmetrically arranged threaded sleeves are threadedly connected to the bidirectional lead screw. A guiding assembly connected to the threaded sleeve is arranged on the fixed plate.

[0009] As a further solution of the present invention: The guiding assembly includes guiding columns fixed on the fixed plate. Symmetrically arranged guiding sleeves are slidably installed on the guiding columns. A connecting plate fixedly connected to the threaded sleeve is fixed on the side wall of the guiding sleeve.

[0010] As a further solution of the present invention: The yaw assembly includes follower rods symmetrically arranged and fixed on the side wall of the threaded sleeve. A spiral groove and a vertical groove are formed on the circumferential outer wall of the follower rod. A sliding sleeve fixedly connected to the scraper is slidably installed on the follower rod. A limiting block slidably fitted with the spiral groove and the vertical groove is fixed on the inner wall of the sliding sleeve.

[0011] As a further solution of the present invention: The follow-up lifting mechanism includes a sliding block axially sliding along the follower rod and in abutting cooperation with the sliding sleeve. A support column slidably connected to the sliding block is fixed on the guiding sleeve. A limiting column is fixed on the side wall of the sliding block; It further includes a guiding assembly arranged on the fixed plate for guiding the limiting column to move in the vertical direction.

[0012] As a further solution of the present invention: The guiding assembly includes a support plate fixed on the fixed plate. Symmetrically arranged guiding grooves slidably fitted with the limiting column are formed on the support plate.

[0013] As a further solution of the present invention: The guiding assembly further includes guiding rods symmetrically arranged and rotatably installed on the support plate. A first fixing block and a second fixing block in abutting cooperation with the guiding rods are fixed on the support plate.

[0014] As a further solution of the present invention: A conveying assembly and a pumping assembly are further arranged on the bracket. Among them, the conveying assembly includes conveying rollers symmetrically arranged and rotatably installed on the bracket. A conveyor belt is sleeved on the conveying rollers. A first motor is fixed on the bracket. The output shaft of the first motor is connected to one of the conveying rollers.

[0015] As a further solution of the present invention: the pumping assembly includes a storage tank fixed on the protective frame, and a delivery pipe connected to the bottom of the storage tank and communicating with the coating head.

[0016] The local flow coating method for the release layer of plastic recycled hot stamping foil includes the following steps: Step 1: Place the material to be coated on the conveying assembly, and control the movement of the material towards the coating head direction through the conveying assembly; Step 2: When the material moves to the position where it cooperates with the coating head, under the action of the pumping assembly, control the coating liquid to be sprayed on the surface of the material through the coating head; Step 3: Under the action of the bidirectional translation mechanism, control the two scraping plates to move towards the central area along the side of the material through the yaw assembly, so as to perform a leveling action on the coating layer with thickened edges; Step 4: Under the action of the follow-up lifting mechanism, control the scraping plate to gradually lift a certain height and yaw a certain angle through the yaw assembly, so as to push the coating material in the thickened area towards the central area of the material.

[0017] Compared with the prior art, the beneficial effects of the present invention are: this application can achieve the uniformity of the coating area by leveling the coating liquid in the thickened area at the edge. Specifically, through the bidirectional translation mechanism, the two scraping plates can move towards each other, so as to level the coating liquid in the thickened area at the edge through the scraping plates. At the same time, under the action of the follow-up lifting mechanism, control the scraping plate to gradually lift a certain height through the yaw assembly, so as to evenly spread the accumulated coating machine near the coating center area. And during the lifting process of the scraping plate, it can yaw a certain angle, so as to gather the coating liquid towards the coating head direction and mix it with the coating liquid with stronger flowability, thereby balancing the flow rate of the coating liquid and ensuring uniform coating.

[0018] By controlling the mutual approach of the scraping plates, the leveling treatment of the coating area with thickened edges can be realized, and the coating liquid in the thickened area will gradually be pushed towards the coating center area. During the pushing process, since the distance between the scraping plates and the coating area gradually increases, the coating liquid can be evenly spread in the area near the coating center position, so as to be evenly dispersed to the entire coating area through the subsequent flow of the coating liquid.

[0019] By controlling the scraping plate to yaw a certain angle, the coating liquid in the area with thickened edges and poor flowability can be gathered towards the coating center area and the area near the coating head direction. Through the mixing with the coating liquid in this area, the fluidity of the coating liquid is neutralized, which can not only effectively prevent the phenomenon of re-flowing to the edge and thickening again, but also ensure that it always has a certain fluidity, prevent the coating liquid from accumulating in the coating center area, and gradually flow to the entire coating area. Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of an embodiment of a local flow-extension coating device for the release layer of plastic-recycled hot stamping foil.

[0021] Figure 2 It is a schematic structural diagram of another angle in an embodiment of a local flow-extension coating device for the release layer of plastic-recycled hot stamping foil.

[0022] Figure 3 It is a schematic structural diagram of a storage tank, a conveying pipe, and a coating head in an embodiment of a local flow-extension coating device for the release layer of plastic-recycled hot stamping foil.

[0023] Figure 4 It is a schematic connection diagram of a bidirectional translation mechanism, a partial yaw assembly, and a follow-up lifting mechanism in an embodiment of a local flow-extension coating device for the release layer of plastic-recycled hot stamping foil.

[0024] Figure 5 For Figure 4 The enlarged schematic structural diagram at position A in

[0025] Figure 6 It is a schematic structural diagram of a partial bidirectional translation mechanism, a partial yaw mechanism, and a partial follow-up lifting mechanism in an embodiment of a local flow-extension coating device for the release layer of plastic-recycled hot stamping foil.

[0026] Figure 7 It is a schematic structural diagram of a partial yaw assembly and a partial follow-up lifting mechanism in an embodiment of a local flow-extension coating device for the release layer of plastic-recycled hot stamping foil.

[0027] Figure 8 It is an exploded schematic structural diagram of a partial yaw assembly and a partial follow-up lifting mechanism in an embodiment of a local flow-extension coating device for the release layer of plastic-recycled hot stamping foil.

[0028] Figure 9 It is a schematic structural diagram of a partial follow-up lifting mechanism in an embodiment of a local flow-extension coating device for the release layer of plastic-recycled hot stamping foil.

[0029] Figure 10 It is an exploded schematic structural diagram of a partial follow-up lifting mechanism in an embodiment of a local flow-extension coating device for the release layer of plastic-recycled hot stamping foil.

[0030] Figure 11 It is a partial half-sectional schematic structural diagram in an embodiment of a local flow-extension coating device for the release layer of plastic-recycled hot stamping foil.

[0031] In the figure: 1. Support; 2. First motor; 3. Conveyor belt; 4. Protective frame; 5. Storage bin; 6. Delivery pipe; 7. Coating head; 8. Fixed plate; 9. Second motor; 10. Bi-directional lead screw; 11. Threaded sleeve; 12. Guide post; 13. Guide sleeve; 14. Connecting plate; 15. Follow-up rod, 1501. Spiral groove; 1502. Vertical groove; 16. Support column; 17. Slide block; 18. Limit post; 19. Slide sleeve; 20. Limit block; 21. Scraper; 22. Support plate, 2201. First horizontal groove; 2202. Inclined groove; 2203. Second horizontal groove; 2204. Straight groove; 23. Guide rod; 24. First fixing block; 25. Second fixing block. Detailed implementation mode

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] In addition, the elements in the present invention are referred to as "fixed to" or "arranged on" another element. It can be directly on another element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation mode.

[0034] Please refer to Figures 1 to 11 , in the embodiment of the present invention, a local flow coating device for the release layer of plastic recycled hot stamping foil includes: A support 1, and a protective frame 4 and a fixed plate 8 fixed on the support 1. The coating head 7 is fixed inside the protective frame 4; It further includes: A bi-directional translation mechanism arranged on the fixed plate 8. A yaw assembly is arranged on the bi-directional translation mechanism. The yaw assembly includes symmetrically arranged scrapers 21. The bi-directional translation mechanism can drive the two scrapers 21 to move towards each other or away from each other through the yaw assembly; A follow-up lifting mechanism arranged on the fixed plate 8 and connected to the yaw assembly. The follow-up lifting mechanism can adjust the height of the scraper 21 through the yaw assembly when the scraper 21 translates, and control the scraper 21 to perform a yaw action; A conveying assembly and a pumping assembly are further arranged on the support 1.

[0035] Specifically, the preparation of the release layer of the plastic recycled hot stamping foil is a key process step. Its purpose is to form a film on the carrier of the hot stamping foil (usually polyester film, etc.) that can reduce the adhesion between other layers and the carrier. Therefore, when the material to be coated is placed on the conveying assembly, the conveying assembly can guide the material to move to the position where it cooperates with the coating head 7. Under the action of the pumping assembly, the coating liquid is evenly sprayed on the surface of the material through the coating head 7. At the same time, under the action of the bidirectional translation mechanism, the yaw assembly controls the two scrapers 21 to move along both sides of the material towards the central area of the material. During the movement, the edge thickened area is leveled. The bidirectional translation mechanism also drives the follower lifting mechanism to move, so that the scrapers 21 are gradually lifted to a certain height, and the two scrapers 21 are controlled to yaw towards each other to push the coating liquid towards the central area of the material. When the scrapers 21 rise to the maximum height, the scrapers 21 are separated from the coated area on the surface of the material and move towards the initial position until the scrapers 21 return to the initial position. Repeat the above steps to continuously level the thickened coated area on the side of the material.

[0036] Preferably, due to the certain fluidity of the coating liquid itself, during the spreading process, the local coated area is prone to edge bulging due to the Marangoni effect (surface tension gradient), forming a "coffee ring" defect at the microscale. And due to the uneven distribution of the shear rate during the spreading process, it will also cause the problem of edge thickening. Therefore, through the side leveling treatment of the scraper 21, and controlling the coating liquid in the thickened area to move towards the central area, and during the subsequent movement of the material, through the self-spreading effect of the coating liquid, the influence of the edge thickened area can be eliminated, and the coating liquid can be evenly coated on the surface of the material.

[0037] Please refer to Figures 1 - 3 As shown in the figure, the conveying assembly includes conveying rollers rotatably installed on the bracket 1 and symmetrically arranged. A conveyor belt 3 is sleeved on the conveying rollers. A first motor 2 is fixed on the bracket 1, and the output shaft of the first motor 2 is connected to one of the conveying rollers. The pumping assembly includes a storage tank 5 fixed on the protective frame 4, and a conveying pipe 6 connected to the bottom of the storage tank 5 and communicating with the coating head 7.

[0038] Furthermore, a traction roller for moving the material is also provided on the bracket 1. Through the cooperation of the conveyor belt 3, the material can be guided to move smoothly along the traveling direction of the conveyor belt 3 to ensure the stability of coating. When coating is required, at this time, the first motor 2 operates and drives the conveyor belt 3 to move through the conveyor roller, so as to cooperate with the traction roller to control the material to move smoothly. When the material moves to the position where it cooperates with the coating head 7, at this time, the coating liquid in the storage tank 5 can be pumped into the coating head 7 through the delivery pipe 6 by means of pumping, and the coating liquid is evenly sprayed on the surface of the material through the coating head 7. The coating liquid located on the surface of the material can be more evenly distributed in the required coating area due to its own flowing-down effect.

[0039] Please refer to Figure 1 、 Figure 2 、 Figure 4 、 Figure 6 The bidirectional translation mechanism includes a second motor 9 fixed on the fixed plate 8. A bidirectional lead screw 10 connected to the output shaft of the second motor 9 is rotatably installed on the fixed plate 8. Symmetrically arranged threaded sleeves 11 are threadedly connected to the bidirectional lead screw 10. A guiding component connected to the threaded sleeve 11 is arranged on the fixed plate 8. The guiding component includes a guiding column 12 fixed on the fixed plate 8. Symmetrically arranged guiding sleeves 13 are slidably installed on the guiding column 12. A connecting plate 14 fixedly connected to the threaded sleeve 11 is fixed on the side wall of the guiding sleeve 13.

[0040] Specifically, before coating starts, the bidirectional lead screw 10 controls the two threaded sleeves 11 to be at the end of the stroke in the direction of moving away from each other, so as to control the maximum distance between the two scraping plates 21 through the yaw assembly, and this distance is slightly larger than the coating area. At this time, the distance between the scraping plate 21 and the material in the vertical direction is equivalent to the coating thickness. When the material needs to be coated, as the coating liquid is sprayed on the surface of the material, due to the flowing-down effect of the coating liquid itself, it will gradually flow down to the entire coating area. However, when the coating liquid flows to the edge area, due to the influence of the Marangoni effect (surface tension gradient), it is easy to cause the edge to bulge, which in turn leads to the problem of uneven coating area. Therefore, this area needs to be leveled. Under the action of the second motor 9, the bidirectional screw 10 is controlled to rotate, thereby driving the two threaded sleeves 11 to move. The threaded sleeve 11 will control the guide sleeve 13 to move along the length direction of the guide column 12 through the connecting plate 14. Since the guide column 12 and the guide sleeve 13 have a guiding function, it can be ensured that the threaded sleeve 11 moves along the length direction of the bidirectional screw 10 and will not rotate with the bidirectional screw 10. Therefore, under the action of the two threaded sleeves 11, the two scrapers 21 can be controlled by the deflection assembly to gradually move from the coating edge area toward the coating center area to scrape the thickened part of the coating edge. When the distance between the two scrapers 21 reaches the minimum, the second motor 9 controls the bidirectional screw 10 to reverse to control the two scrapers 21 to move toward the initial position, and repeat the above steps to achieve continuous processing of the coating thickening area to ensure more uniform coating.

[0041] See also Figure 1 , Figure 2 , Figures 4 - 11 The deflection assembly includes a follower rod 15 fixed to the side wall of the threaded sleeve 11 and symmetrically arranged. The outer circumferential wall of the follower rod 15 is formed with a spiral groove 1501 and a vertical groove 1502. A sliding sleeve 19 fixedly connected to the scraper 21 is slidably mounted on the follower rod 15. A limit block 20 slidably engaged with the spiral groove 1501 and the vertical groove 1502 is fixed on the inner wall of the sliding sleeve 19. The follower lifting mechanism includes a sliding block 17 that slides along the axial direction of the follower rod 15 and contacts the sliding sleeve 19. The guide sleeve 13 is fixed with a stop block 20 that is slidably engaged with the sliding block 1 The support column 16 is slidably connected to the sliding block 17, and the side wall of the sliding block 17 is fixed with a limiting column 18; it also includes a guide component arranged on the fixed plate 8 for guiding the limiting column 18 to move in the vertical direction, the guide component includes a support plate 22 fixed on the fixed plate 8, and the support plate 22 is formed with guide grooves that are symmetrically arranged and slidingly engaged with the limiting column 18. The guide component also includes a guide rod 23 that is rotatably mounted on the support plate 22 and is symmetrically arranged, and the support plate 22 is fixed with a first fixed block 24 and a second fixed block 25 that are in contact with the guide rod 23.

[0042] It should be noted that the guiding groove can be divided into four sections, namely the first horizontal groove 2201, the inclined groove 2202, the second horizontal groove 2203, and the straight groove 2204. The two ends of the straight groove 2204 are respectively connected to one end of the first horizontal groove 2201 and the second horizontal groove 2203. One end of the inclined groove 2202 is connected to the other end of the first horizontal groove 2201, and the other end is connected to the second horizontal groove 2203. The guiding rod 23 is in a free swinging state. When the guiding rod 23 abuts against the first fixing block 24, the guiding rod 23 is parallel to the second horizontal groove 2203, and the side of the guiding rod 23 and the side of the second horizontal groove 2203 are on the same reference plane. When the guiding rod 23 abuts against the second fixing block 25, the guiding rod 23 is parallel to the inclined groove 2202, and the side of the guiding rod 23 and the side of the inclined groove 2202 are on the same reference plane.

[0043] Please refer to Figure 9 、 Figure 10 When no coating is carried out, under the action of gravity, the guiding rod 23 abuts against the first fixing block 24, so that the inclined groove 2202 is in a blocked state. At this time, the limiting column 18 is located at the connecting position of the first horizontal groove 2201 and the straight groove 2204, so that the sliding block 17 is located at the end of the stroke in the direction away from the threaded sleeve 11, so as to control the scraper 21 to be located at the end of the stroke in the direction towards the conveyor belt 3 through the sliding sleeve 19. Under the action of the sliding sleeve 19, the limiting block 20 is controlled to be located at the end of the stroke on the side of the spiral groove 1501 away from the vertical groove 1502, so that the scraper 21 is in a state parallel to the conveyor belt 3. At this time, the distance between the two scrapers 21 is just slightly larger than the material coating area, and the distance between the scraper 21 and the material in the vertical direction is equivalent to the coating thickness.

[0044] When the coating liquid is sprayed on the required coating area on the surface of the material, the closer the distance is to the coating head 7, the higher the temperature of the coating liquid, the faster its spreading rate, and the smaller the spreading area. The greater the distance from the coating head 7, the gradually cooling temperature of the coating liquid, the slower its spreading rate, and the larger the spreading area. Therefore, with the progress of spreading and the increase of the distance from the coating head 7, under the influence of the Marangoni effect (surface tension gradient), the thickness of the coating edge area is greater; When it is necessary to process the thickened area of the coating edge, at this time, under the action of the bidirectional translation mechanism, the two follower rods 15 are controlled to move towards each other, and the scraper 21 is driven to move through the sliding sleeve 19. The follower rod 15 will also drive the sliding block 17 to move, so as to control the limiting column 18 to slide along the length direction of the first horizontal groove 2201. Under the action of the support column 16, it can be ensured that the sliding block 17 will not shift during movement, so as to ensure that the limiting column 18 always slides in the guiding groove. Under the action of the limiting column 18 and the first horizontal groove 2201, it can also be ensured that the position of the sliding block 17 on the follower rod 15 will not change, so as to ensure that the height of the scraper 21 will not change; When the squeegee 21 moves to contact the coating area, the squeegee 21 can level the coating liquid in the edge thickening area and push the excess coating liquid in the thickening area towards the center area of the material. As the squeegee 21 gradually moves, the amount of excess coating liquid accumulated on the side where the squeegees 21 approach each other gradually increases. When the limit post 18 disengages from the first horizontal groove 2201 and enters the inclined groove 2202, the limit post 18 will drive the sliding block 17 to slide along the axial direction of the follower rod 15 and move towards the threaded sleeve 11. Under the action of the sliding block 17, the sliding sleeve 19 is driven to move synchronously, thereby controlling the distance between the squeegee 21 and the material to gradually and slowly increase, so that the accumulated coating liquid is gradually spread on the coating area; Please refer to Figure 11 , the sliding sleeve 19 will also drive the limit block 20 to slide along the track of the spiral groove 1501. Under the action of the limit block 20 and the spiral groove 1501, the sliding sleeve 19 rotates by a certain angle itself to drive the squeegee 21 to deflect by a certain angle. Under the action of the squeegee 21, while controlling the spreading of the coating liquid, the excess coating liquid is guided to gradually converge towards the center area of the coating. When the limit block 20 moves to the connection position of the spiral groove 1501 and the vertical groove 1502, the deflection angle of the squeegee 21 reaches the maximum. At this time, the limit block 20 will enter the vertical groove 1502, and the deflection angle of the squeegee 21 will no longer change. When the limit post 18 abuts against one side of the guide rod 23, the guide rod 23 will separate from the first fixing block 24 and deflect towards the second fixing block 25 until the limit post 18 disengages from the inclined groove 2202 and enters the second horizontal groove 2203. At this time, the lifting height of the squeegee 21 reaches the maximum and is completely separated from the coating liquid. Under the action of gravity, the guide rod 23 returns to the position abutting against the first fixing block 24 again. When the limit post 18 moves to the end of the stroke of the second horizontal groove 2203 away from the straight groove 2204, the distance between the two squeegees 21 reaches the minimum value.

[0045] At this time, under the action of the bidirectional translation mechanism, the two follower rods 15 are controlled to move towards the initial position, so that the limit posts 18 slide in the second horizontal groove 2203. When the limit posts 18 abut against the other side of the guide rod 23, since the guide rod 23 abuts against the first fixed block 24, it can ensure that the inclined groove 2202 is in a blocked state, and the limit posts 18 always slide along the second horizontal groove 2203. When the limit posts 18 move to the connection position of the second horizontal groove 2203 and the straight groove 2204, the distance between the two scraping plates 21 reaches the maximum. Under the action of gravity, the limit posts 18 return to the connection position of the straight groove 2204 and the first horizontal groove 2201 through the straight groove 2204, so that the distance between the scraping plates 21 and the material in the vertical direction is again in a state equivalent to the coating thickness. The sliding block 17 and the sliding sleeve 19 are also reset. Under the action of the limit block 20 and the spiral groove 1501, the scraping plates 21 are in a state parallel to the conveyor belt 3. By repeating the above steps, the scraping and leveling treatment of the edge-thickened coating area is realized.

[0046] Preferably, by controlling the mutual approach of the scraping plates 21, the scraping and leveling treatment of the edge-thickened coating area can be realized, and the coating liquid in the thickened area will gradually be pushed towards the coating center area. During the pushing process, since the distance between the scraping plates 21 and the coating area gradually increases, the coating liquid can be evenly spread on the area near the coating center position, so that through the subsequent flow of the coating liquid, it can be evenly dispersed throughout the coating area.

[0047] Since the flowability of the coating liquid is worse the farther it is from the coating head 7, by controlling the scraping plates 21 to deflect by a certain angle, the coating liquid in the edge-thickened area with poor flowability can be gathered towards the coating center area and the area near the coating head 7. Through the mixing with the coating liquid in this area, the fluidity of the coating liquid is neutralized, which can not only effectively prevent the coating liquid from flowing to the edge again and thickening, but also ensure that it always has a certain fluidity, prevent the coating liquid from accumulating in the coating center area, and gradually flow to the entire coating area.

[0048] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0049] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment contains only one independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. Local flow coating device for the release layer of plastic recycled hot stamping foil, comprising: a bracket, as well as a protective frame and a fixing plate fixed on the bracket, wherein a coating head is fixed inside the protective frame; It is characterized in that it further comprises: a bidirectional translation mechanism arranged on the fixing plate, a yaw assembly is arranged on the bidirectional translation mechanism, the yaw assembly includes scraping plates arranged symmetrically, and the bidirectional translation mechanism can drive the two scraping plates to move towards each other or away from each other through the yaw assembly; a follow-up lifting mechanism arranged on the fixing plate and connected to the yaw assembly, the follow-up lifting mechanism can adjust the height of the scraping plate through the yaw assembly when the scraping plate translates, and control the scraping plate to perform a yaw action.

2. The partial flow coating device for the release layer of the plastic recycled hot stamping foil according to claim 1, wherein, The bidirectional translation mechanism includes a second motor fixed on the fixing plate, a bidirectional lead screw rotatably installed on the fixing plate and connected to the output shaft of the second motor, symmetrically arranged threaded sleeves are threadedly connected to the bidirectional lead screw, and a guiding assembly connected to the threaded sleeve is arranged on the fixing plate.

3. The local flow coating device for the release layer of the plastic recycled hot stamping foil according to claim 2, characterized in that The guiding assembly includes guiding columns fixed on the fixing plate, symmetrically arranged guiding sleeves are slidably installed on the guiding columns, and a connecting plate fixed to the threaded sleeve is fixed on the side wall of the guiding sleeve.

4. The partial flow coating device for the release layer of the plastic recycled hot stamping foil according to claim 2, characterized in that, The yaw assembly includes follower rods symmetrically arranged and fixed on the side wall of the threaded sleeve, a spiral groove and a vertical groove are formed on the circumferential outer wall of the follower rod, a sliding sleeve fixedly connected to the scraping plate is slidably installed on the follower rod, and a limiting block slidably fitted with the spiral groove and the vertical groove is fixed on the inner wall of the sliding sleeve.

5. The partial flow coating device for the release layer of the plastic recycled hot stamping foil according to claim 4, characterized in that, The follow-up lifting mechanism includes a sliding block axially sliding along the follower rod and in contact with the sliding sleeve, a support column slidably connected to the sliding block is fixed on the guiding sleeve, and a limiting column is fixed on the side wall of the sliding block; It further includes a guiding assembly arranged on the fixing plate for guiding the limiting column to move in the vertical direction.

6. The partial flow coating device for the release layer of the plastic recycled hot stamping foil according to claim 5, characterized in that, The guiding assembly includes a support plate fixed on the fixing plate, and symmetrically arranged guiding grooves slidably fitted with the limiting column are formed on the support plate.

7. The partial flow coating device for the release layer of the plastic recycled hot stamping foil according to claim 5, characterized in that, The guiding assembly further includes guiding rods symmetrically arranged and rotatably installed on the support plate, and a first fixing block and a second fixing block in contact with the guiding rods are fixed on the support plate.

8. The local flow coating device for the release layer of the plastic recycled hot stamping foil according to claim 1, characterized in that, A conveying assembly and a pumping assembly are further arranged on the bracket. Among them, the conveying assembly includes conveying rollers symmetrically arranged and rotatably installed on the bracket, a conveyor belt is sleeved on the conveying rollers, a first motor is fixed on the bracket, and the output shaft of the first motor is connected to one of the conveying rollers.

9. The local flow coating device for the release layer of the plastic recycled hot stamping foil according to claim 8, characterized in that, The pumping assembly includes a storage tank fixed on the protective frame, and a conveying pipe connected to the bottom of the storage tank and communicated with the coating head.

10. A local flow-extension coating method for the release layer of a plastic-recycled hot stamping foil, using the local flow-extension coating device for the release layer of the plastic-recycled hot stamping foil according to any one of claims 1-9, characterized in that Including the following steps: Step 1: Place the material to be coated on the conveying assembly, and control the material to move towards the coating head through the conveying assembly; Step 2: When the material moves to the position matching the coating head, under the action of the pumping assembly, control the coating liquid to be sprayed on the surface of the material through the coating head; Step 3: Under the action of the bidirectional translation mechanism, control the two scraping plates to move along the side of the material towards the central area through the yaw assembly, so as to perform a leveling action on the coating layer with thickened edges; Step 4: Under the action of the follow-up lifting mechanism, control the scraping plate to gradually lift a certain height and yaw a certain angle through the yaw assembly, so as to push the coating material in the thickened area towards the central area of the material.

Images