Bubble removal process for a glue roller surface of a printed product

Abstract

The present application relates to a bubble removing process for the surface of a printing product glue roller, comprising the steps of: 1) the left and right ends of the floating roller protrude from the left and right ends of the glue roller, and the left or right end of the floating roller freely contacts the inner side of the glue tank; 2) by the rotation of the glue roller, the left and right roller sleeves rotate towards each other, the floating roller rotates synchronously, and the glue between the glue roller to be coated and the floating roller is drained from the middle to the left and right ends, so that the bubbles adhering to the to-be-coated part are discharged to the two ends and / or the outside of the floating roller, and the left and right roller sleeves and the floating roller keep rotating and moving between approaching or moving away from the glue roller with the floating of the glue surface. The present application not only reduces the probability of bubbles being coated on the printing product and reduces the product scrap rate, but also improves the uniformity of the glue coating; on the other hand, it can avoid the collision between the floating roller and the glue roller during movement, and effectively reduce the movement amplitude of the floating roller in the left and right directions.

Description

[0001] The present application is a divisional application of a patent application with the application date of January 16, 2023, the application number of 202310063151.0, and the title of Bubble-removing Gluing System and Gluing Process for Printed Products. TECHNICAL FIELD

[0002] The present application belongs to the field of printing and gluing, and specifically relates to a gluing roller surface bubble removal process for printed products. BACKGROUND

[0003] Currently, for many packaging bags, film layers need to be glued between them to achieve the required composite function, so gluing is a common process.

[0004] However, in the conventional gluing process, the conventional operation is to use a gluing roller partially immersed in a gluing tank to brush the passing film layer. However, the conventional gluing process has the following defects:

[0005] 1) During the movement of the gluing roller in the gluing tank, bubbles will be generated around the periphery of the gluing roller. If the bubbles move to the film layer with the gluing roller, uneven gluing, hollowing, and other phenomena will occur, resulting in poor quality of the final gluing, high scrap rate, and other defects.

[0006] 2) The amount of glue on the gluing roller depends on the thickness of the formed glue layer. If the glue layer is too thick or too thin or uneven, it will affect the quality of the gluing.

[0007] To address the above-mentioned defect 1), many manufacturers have improved the equipment and process, for example, Chinese patent CN215542252U (referred to as Document 1), which discloses a gluing device and a coating equipment. Specifically, the gluing device includes a rack, a pressure roller and a transmission roller group for guiding the substrate to pass through the pressure roller are rotatably arranged on the rack, a gluing roller is rotatably arranged below the pressure roller on the rack, a glue basin is arranged below the gluing roller on the rack, the gluing roller is partially contained in the glue basin, a bubble-removing mechanism is arranged in the cavity of the glue basin, and the bubble-removing mechanism can push the bubbles on the glue surface in the glue basin along the inner side wall of the glue basin. That is, it can push the glue bubbles near the gluing roller towards the inner side wall of the glue basin, preventing the bubbles from adhering to the gluing roller and helping to apply a more uniform glue layer to the substrate.

[0008] To overcome the above-mentioned defects 2), more scraping is used, for example, Chinese patent CN207981531U (hereinafter referred to as document 2), which discloses a high-efficiency glue coating device of a bonding machine, which relates to a glue uniform distribution adjusting device. The device can not only control the glue coating thickness of the glue coating roller, but also make the glue coating of the glue coating roller more uniform, with good glue coating quality. The glue coating roller can produce different thickness of glue layer on the fabric, with wider applicability.

[0009] However, the document 1 has the following technical defects:

[0010] A) The bubble removal mechanism is arranged in the glue basin, and the driving assembly is also immersed in the glue, so the power output requirement is higher;

[0011] B) During the glue coating process, the distance between the glue coating roller and the bubble removal roller is fixed. When the glue liquid surface shakes, the bubbles cannot be smoothly removed with the rotation of the roller, resulting in poor bubble removal effect. Moreover, the left and right spirals used cause uneven distribution of the glue amount on the surface of the glue coating roller.

[0012] At the same time, the glue uniform distribution adjusting device used in the document 2 has a short glue scraping channel, so it cannot remove the excess glue amount and bubbles on the glue roller. SUMMARY

[0013] The technical problem to be solved by the present application is to overcome the deficiencies of the prior art and provide a new bubble removal process for the surface of a glue coating roller of a printed product.

[0014] To solve the above technical problems, the technical solutions adopted by the present application are as follows:

[0015] A bubble removal process for the surface of a glue coating roller of a printed product, the lower part of the glue coating roller is located in the glue liquid of the glue immersion tank, and one side of the upper part of the glue coating roller is the glue coating part, and the other side is the glue coated part. The bubble removal device used in the process includes a floating roller floating on the glue liquid of the glue immersion tank, a left roller sleeve and a right roller sleeve coaxially sleeved on the left and right end parts of the floating roller, wherein the left roller sleeve and the right roller sleeve separate the floating roller and the glue coating roller. The floating roller has a spiral drainage groove formed thereon, and the bubble removal process includes the following steps:

[0016] 1) The left and right end parts of the floating roller protrude out of the left and right end parts of the glue coating roller, the printed product is located between the left roller sleeve and the right roller sleeve, and the left end part or the right end part of the floating roller freely abuts against the inside of the glue immersion tank;

[0017] 2) by the rotation of the glue roller, the left sleeve and the right sleeve are rotated towards each other, the floating roller is relatively synchronous, and the glue between the glue roller and the floating roller is guided from the middle to the left and right ends, so that the bubbles on the glue roller are discharged to the left and right ends and / or the outside of the floating roller. At the same time, the left sleeve, the right sleeve, and the floating roller keep rotating and moving between the glue roller and the glue roller.

[0018] According to a specific implementation and preferred aspect of the present application, in step 2), the stress direction applied by the glue roller to the left sleeve and the right sleeve is upward and backward along the tangent direction of the fitting, so that the force is decomposed in the horizontal direction and the vertical direction to drive the floating roller, the left sleeve and the right sleeve to rotate and move backward away from the glue roller direction, and keep rotating under the inertia. Here, the design of the floating roller and the left and right sleeves and the layout relative to the glue roller not only separate the floating roller and the glue roller, but also facilitate the flow of glue near the glue part to be coated; and reduce the slip or lateral movement when moving towards each other.

[0019] Preferably, the forward thrust formed by the glue fluctuation caused by the glue roller pushes the floating roller towards the glue roller again to complete the repeated movement process of relative separation and relative fitting.

[0020] In step 1), at most half of the lower part of the floating roller is below the liquid level of the glue. The self-weight of the floating roller used is assembled according to the buoyancy provided by the glue, which can meet the needs of floating in different glue tanks, and has strong practicability.

[0021] According to another specific implementation and preferred aspect of the present application, the floating roller is formed with left and right spiral guide grooves in the circumferential direction, which are opposite in spiral winding direction from the middle to the two ends. In the rotation of the floating roller, it can guide from the middle to the two ends. In some specific embodiments, the left and right spiral guide grooves are connected from the middle.

[0022] In some preferred embodiments, the left and right spiral guide grooves respectively pass through the inside of the left sleeve and the right sleeve. In this structure, the probability of forming a guide obstacle and causing backflow is low.

[0023] According to another specific implementation and preferred aspect of the present application, the floating roller includes a hollow tube with left and right spiral guide grooves formed on the circumferential surface, and a counterweight tube plug at both ends of the hollow tube. The structure is simple, and can meet the needs of floating and rotating according to actual needs. At the same time, in some specific embodiments, at most half of the lower part of the floating roller is below the liquid level of the glue, which ensures that the buoyancy meets the balance of vertical force, and the rotating bubble discharge is more labor-saving.

[0024] Preferably, the left and right ends of the floating roller protrude from the left and right ends of the glue roller. In this way, the effective width of the glue coating is effectively increased to meet the glue coating requirements of different width printing products.

[0025] In some embodiments, the left roller sleeve and the right roller sleeve each comprise a sleeve body, wherein a plurality of ridges are distributed circumferentially on the sleeve body, and an anti-skid rolling groove is formed between adjacent two ridges. The advantages of this design are: 1. The relative distance between the floating roller and the glue roller is increased, which is beneficial to the flow of glue liquid near the part to be coated; 2. The collision between the floating roller and the glue roller during movement is avoided, which affects the glue coating effect.

[0026] Preferably, the ridges extend along the length direction of the floating roller and are spaced apart circumferentially around the left roller sleeve and the right roller sleeve. In this way, the probability of slipping or transverse movement during relative movement is reduced, and the floating roller can also better contact the glue roller to drive the rotation of the floating roller.

[0027] According to another specific implementation and preferred aspect of the present application, the glue roller surface bubble removing device further comprises a magnetic ring formed on the floating roller and / or the left roller sleeve and / or the right roller sleeve, wherein the magnetic ring forms an adsorption force to drive the floating roller to keep a certain distance apart and to keep a tangential contact with the glue roller. Here, the relative contact movement trend is formed by using magnetic force. Once the glue roller forms a tangential force, the floating roller can quickly approach the glue roller, so that the floating roller keeps a certain distance apart from the glue roller during rotation to avoid contact type bubble removal.

[0028] Preferably, the magnetic ring is installed in the floating roller, the floating roller is a metal pipe, and the left roller sleeve and the right roller sleeve are plastic parts. Alternatively, the magnetic ring is located inside the left roller sleeve and the right roller sleeve respectively; and the floating roller, the left roller sleeve and the right roller sleeve are plastic parts.

[0029] Thanks to the implementation of the above technical solutions, the present application has the following advantages compared with the prior art:

[0030] The present application is based on the fact that the floating roller has no power and small axial displacement, and that the left and right roller sleeves and the floating roller keep synchronous and relative rotation with the glue roller and move between approaching and moving away from the glue roller to remove the bubbles on the surface of the glue roller to the side and / or both ends away from the glue roller, thereby completing the removal of the bubbles on the surface of the glue roller. This not only reduces the probability of bubbles being coated on the printing product, improves the glue coating quality, and reduces the product scrap rate, but also improves the uniformity of the glue coating. In addition, the collision between the floating roller and the glue roller during movement is avoided, and the movement amplitude of the floating roller in the left and right directions is effectively reduced. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1This is a front view schematic diagram of the bubble-removing adhesive coating system for printed articles according to Example 1;

[0032] Figure 2 for Figure 1 A schematic diagram of the left view (partially omitted);

[0033] Figure 3 for Figure 1 Enlarged half-section diagram of the floating roller and the left and right roller sleeves;

[0034] Figure 4 for Figure 1 Enlarged view of point A in the middle;

[0035] Figure 5 This is a half-section enlarged schematic diagram of the floating roller and the left and right roller sleeves in Example 2;

[0036] Figure 6 This is a half-section enlarged schematic diagram of the floating roller and the left and right roller sleeves in Example 3;

[0037] Among them: 1. Impregnation tank;

[0038] 2. Glue roller; 20. Part to be glued; 21. Glue-coated part;

[0039] 3. Floating roller; 30. Left spiral guide channel; 31. Right spiral guide channel; 3a. Hollow tube; 3b. Counterweight plug;

[0040] 4. Glue scraper assembly; 40. Glue scraper; 41. Turning component; f. Glue scraping seam; f1. First seam segment; f2. Second seam segment; f3. Third seam segment;

[0041] 5. Transfer rollers;

[0042] 6. Left roller sleeve; 7. Right roller sleeve; c. Anti-slip groove;

[0043] 8. UV lamp (curing lamp); 9. Transfer roller;

[0044] H, magnetic ring;

[0045] P, printed matter; q, air bubble. Detailed Implementation

[0046] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0047] In the description of the application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0048] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0049] In the application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0050] In the application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0051] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0052] Example 1

[0053] like Figure 1 and Figure 2 As shown, the bubble-removing adhesive coating system for printed products in this embodiment includes an impregnation tank 1, an adhesive coating roller 2 located in the adhesive liquid in the impregnation tank 1, and an air bubble removal device on the surface of the adhesive coating roller. The air bubble removal device on the surface of the adhesive roller includes a floating roller 3 floating on the adhesive liquid in the impregnation tank 1, a scraper assembly 4 located above the floating roller 3 and flipped and scraped on the adhesive coating roller 2, and a left roller sleeve 6 and a right roller sleeve 7 respectively sleeved on the left and right ends of the floating roller 3.

[0054] Specifically, the printed product P is coated with adhesive by a roller brush through a transfer roller 5 that cooperates with the coating roller 2.

[0055] In this example, the transfer roller 5 is located directly above the glue-applying roller 2, and the glue-applying roller 2 has a glue-to-be-applied section 20 on one side above the glue liquid and a glue-applied section 21 on the other side, wherein the glue-to-be-applied section 20 and the glue-applied section 21 are arranged symmetrically.

[0056] The floating roller 3 has a left spiral channel 30 and a right spiral channel 31 with opposite spiral winding directions from the middle to both ends. The floating roller 3 rotates synchronously and in opposite directions with the coating roller 2, and the glue between the floating roller 3 and the coating roller 2 is guided from the middle to the left and right ends to remove the air bubbles that are attached to the part to be coated 20 to the side and ends of the floating roller 3 away from the coating roller 2.

[0057] The left-hand spiral drainage channel 30 and the right-hand spiral drainage channel 31 are connected from the middle. This allows for better drainage and bubble removal during relative rotation.

[0058] The left and right ends of the floating roller 3 protrude from the left and right ends of the coating roller 3, respectively. This effectively increases the effective width of the coating to meet the coating needs of printed products of different widths, and also further reduces the probability of the floating roller 3 shifting laterally along its own length direction during opposite movements.

[0059] The left roller sleeve 6 and the right roller sleeve 7 are tangentially attached to the part to be coated 20 in the circumferential direction, and the printed product P is located between the left roller sleeve 6 and the right roller sleeve 7. With the left roller sleeve and the right roller sleeve, the floating roller and the coating roller are relatively separated, which is more conducive to the flow of adhesive close to the part to be coated.

[0060] The left spiral drainage groove 30 and the right spiral drainage groove 31 pass through the inside of the left roller sleeve 6 and the right roller sleeve 7 respectively. This can effectively pass through the inside of the left roller sleeve and the right roller sleeve, avoid forming a drainage obstacle, and reduce the probability of backflow.

[0061] In combination Figure 3 As shown, the floating roller 3 includes a hollow tube 3a with the left spiral drainage groove 30 and the right spiral drainage groove 31 formed on the circumferential surface, and a counterweight tube plug 3b located at both ends of the hollow tube 3a, wherein the extension direction of the hollow tube 3a is consistent with the extension direction of the rubber coating roller 2. That is, the weight of the counterweight tube plug 3b can meet the needs of different rubber dipping grooves 1 to form floating.

[0062] The left roller sleeve 6 and the right roller sleeve 7 are annular, and each of the left roller sleeve 6 and the right roller sleeve 7 includes a ring body, wherein the ring body is coaxial with the floating roller 3 and synchronously rotates (that is, the left roller sleeve 6, the right roller sleeve 7, and the floating roller 3 are relatively fixed and rotate and float together).

[0063] In this example, a convex rib is formed on the circumference of the ring body, and an anti-skid rolling groove c is formed between the adjacent two convex ribs. In this way, the probability of slipping or transverse movement during relative motion is reduced, and better contact can be achieved to drive the rotation of the floating roller.

[0064] Specifically, the convex ribs extend along the length direction of the floating roller 3 and are distributed at intervals around the circumference of the ring body.

[0065] In this example, the hollow tube 3a is a metal tube, and the materials of the left roller sleeve 6 and the right roller sleeve 7 are plastic parts. The lower half of the floating roller 3 is located below the liquid level of the glue solution.

[0066] In combination Figure 4 As shown, the rubber scraping plate assembly 4 is flipped and scraped on the to-be-coated part 20.

[0067] Specifically, the rubber scraping plate assembly 4 includes a rubber scraping plate 40 and a flipping member 41 for driving the rubber scraping plate 40 to flip and move around the length of the rubber coating roller 2, wherein a rubber scraping gap f is formed between the rubber scraping plate 40 and the to-be-coated part 20, and the gap width of the rubber scraping gap f is adjusted with the movement of the flipping member 41 to meet the needs of different thicknesses of rubber coating.

[0068] The rubber scraping plate 40 is upwardly curved and relatively close to the upper part of the to-be-coated part 20 from the edge of the upper part. The advantage of this arrangement is that the excess glue will flow back to the dipping groove when not scraped, thereby facilitating the scraping operation and allowing the formed glue to be more perfectly coated on the printed product.

[0069] The edge of the upper part of the rubber scraping plate 40 is close to the transmission roller 5. At this time, the rubber is scraped and coated at the fastest speed to improve the quality of the rubber coating.

[0070] A slit f is formed between the bottom edge of the squeegee 40 and the part 20 to be coated with adhesive.

[0071] The adhesive application seam f includes a first seam segment f1, a second seam segment f2, and a third seam segment f3 arranged sequentially from bottom to top. The seam width formed by the first seam segment f1 gradually narrows from bottom to top. The second seam segment f2 extends from the upper part of the first seam segment f1 along the tangent direction parallel to the scraping point. The third seam segment f3 gradually widens from the upper part of the second seam segment f2 upwards. This adhesive application seam design is more conducive to even adhesive application.

[0072] As for the flipping component 41, it can be implemented using a conventional flipping shaft and flipping motor. It is clear and feasible that it will not be explained in detail here.

[0073] In summary, the floating roller 3 and the coating roller 2 respectively wrap around... Figure 1 The arrows indicate that the rollers rotate in opposite directions (equivalent to the roller sets commonly used in textiles). The specific rotation process is as follows: The stress applied by the coating roller 2 to the left roller sleeve 6 and the right roller sleeve 7 is directed upward and backward along the tangent of the bonding. As a result, this stress is decomposed in the horizontal and vertical directions, causing the floating roller 3, the left roller sleeve 6, and the right roller sleeve 7 to rotate as a whole while moving backward away from the coating roller (the vertical direction is in equilibrium and does not need to be considered). Under the influence of inertia, they continue to rotate. At the same time, the glue fluctuation caused by the coating roller 2 pushes the floating roller 3 back towards the coating roller 2, thus completing the repeated motion process of relative separation and relative bonding, so as to carry out the rotation of the floating roller 3 to remove bubbles.

[0074] Then, it needs to be further explained that: since the glue-applying roller extends left and right, the glue fluctuation is mainly in the front and back direction, and the fluctuation in the left and right direction is very small. Even if the floating roller moves in the axial direction, its movement amplitude is very small. Therefore, the left and right direction does not need to be considered.

[0075] Therefore, the adhesive application process in this embodiment is as follows:

[0076] S1, Bubble Removal

[0077] As the coating roller 2 rotates clockwise around its axis, the left roller sleeve 6 and the right roller sleeve 7 rotate in opposite directions (counterclockwise). The floating roller 3 rotates synchronously relative to each other, and guides the glue between the part to be coated 20 of the coating roller 2 and the floating roller 3 from the middle to the left and right ends, so that the air bubbles adhering to the part to be coated 20 are discharged to both ends and the outside of the floating roller 3. At the same time, the left roller sleeve 6, the right roller sleeve 7, and the floating roller 3 continue to rotate and move between approaching and moving away from the coating roller 2 as the glue surface floats.

[0078] S2, Applying adhesive, scraping off adhesive, and applying adhesive.

[0079] The plurality of slit sections formed by the doctor blade assembly 4 scrapes off the excess glue on the glue-coated part 20 and applies the glue to the surface of the printed product in a brush roll manner.

[0080] At the same time, in order to avoid glue dropping, a UV lamp 8 (or other curing lamp) is used for heating to make the glue layer cured, and then hot melt pressing is performed when the product is compounded.

[0081] In this example, the UV lamp 8 is located between the transfer roller 9 and the transmission roller 5 and below the printed product P on which the glue layer is located.

[0082] Embodiment 2

[0083] The bubble-removing glue coating system for the printed product involved in this embodiment is basically the same as that in Embodiment 1, and the difference is as follows.

[0084] As shown in Figure 5 In this example, a magnetic ring H is arranged in the floating roller 3.

[0085] Specifically, the material of the floating roller 3 is metal, and the materials of the left roller sleeve 6 and the right roller sleeve 7 are both plastic.

[0086] In this example, the magnetic ring H is annular and is arranged in the hollow tube 3a in an intermittent manner.

[0087] Of course, the magnetic ring H can also be assembled by a plurality of magnetic strips. That is, the shape of the magnetic ring H is not limited, but it needs to meet the following conditions:

[0088] 1) The magnetic ring forms an attractive force to drive the floating roller to keep a tendency to separate and to be tangent to the glue coating roller from the left roller sleeve and the right roller sleeve. Because the relative tangential motion tendency is formed by the magnetic force, once the glue coating roller forms a tangential force, it can quickly approach the glue coating roller, so that the floating roller keeps a separate approach or away from the glue coating roller in rotation to avoid contact type bubble removal.

[0089] 2) The magnetic ring does not affect the rotational balance of the hollow tube, and the magnetic force formed by the magnetic ring and the resistance formed by the glue liquid keep a balance, that is, in the resistance change, the magnetic ring approaches or moves away from the glue coating roller (which is generally a metal roller).

[0090] In addition, in this example, the floating roller 3 keeps a rotating and separating motion state, and under the change of resistance formed by the glue liquid, the tangential pushing formed by the glue coating roller 2, and the magnetic force attraction formed by the magnetic ring H, the floating roller 3 moves between the relative approach and the relative away from the glue coating roller 2.

[0091] Embodiment 3

[0092] The bubble-excluding gluing system of the printing product of the present embodiment is basically the same as that of Embodiment 2, with the difference being as follows.

[0093] As shown in Figure 6 the present embodiment, the magnetic ring H is distributed in the left roller sleeve 6 and the right roller sleeve 7, that is, the magnetic ring H is relatively adsorbed on the gluing roller 2 through the left roller sleeve 6 and the right roller sleeve 7, and the floating roller 3 is relatively floating on the glue liquid surface.

[0094] Specifically, the materials of the floating roller 3, the left roller sleeve 6 and the right roller sleeve 7 are all plastic. In summary, the present embodiment has the following advantages:

[0095] 1. Based on the fact that the floating roller is non-powered, has no axial limit, and is relatively floating under the action of the floating force formed by the floating roller and the gluing roller, the side of the gluing part to be coated is relatively floating to generate a reciprocating motion of relative adhesion and separation, which can drain and exclude the bubbles from the middle to both ends and the outside, and through the design of the three slit sections, the excess glue and the bubbles on the glue roller are scraped and evenly coated, which not only reduces the probability of bubble coating on the printing product, improves the gluing quality, and reduces the product scrap rate, but also improves the uniformity of gluing.

[0096] 2. The design and layout of the floating roller and the left and right roller sleeves relative to the gluing roller not only separate the floating roller and the gluing roller, which is more conducive to the flow of glue liquid near the gluing part to be coated, but also reduces the probability of slipping or transverse movement when moving towards each other, and the glue liquid can pass through the inside of the left and right roller sleeves, avoiding the formation of drainage obstacles and backflow. In addition, the floating roller is prevented from colliding with the gluing roller during movement, which affects the gluing effect.

[0097] 3. The weight of the floating roller is assembled according to the buoyancy provided by the glue liquid, which can meet the needs of floating formed by the amount of glue in different glue immersion tanks, and has strong practicability. At the same time, the floating roller is freely abutted on the inside of the glue immersion tank from the left end or the right end, which not only effectively reduces the movement amplitude of the floating roller in the left-right direction, but also forms a certain limiting force on the floating roller, preventing the gluing roller from being separated too far from the gluing roller, and further assisting the rotation of the floating roller to drain bubbles.

[0098] 4. The layout of the glue scraping plate assembly and the design of the three slit sections make the excess glue flow back to the glue immersion tank when not being scraped, which is conducive to uniform scraping of glue, and the formed amount of glue is more perfectly coated to the printing product. After scraping the glue, the fastest speed is used for gluing, which improves the quality of gluing.

[0099] 5. The use of magnetic rings to maintain a relative adsorption motion allows the floating roller to quickly move back and forth between the left and right rollers and the coating roller as it floats on the liquid surface, further improving the rotation efficiency of the floating roller and thus improving the defoaming effect. At the same time, the design of the magnetic rings also has an important function: to keep the coating roller and the floating roller in a separated state during defoaming. This avoids collisions between the floating roller and the coating roller and also prevents uneven distribution of the coating amount, further improving the uniformity of the coating.

[0100] The present invention has been described in detail above, with the aim of enabling those skilled in the art to understand and implement the invention. However, this description should not be construed as limiting the scope of protection of the invention. All equivalent changes or modifications made in accordance with the spirit and essence of the invention should be included within the scope of protection of the invention.

Claims

1. A bubble removing process for the surface of a printing roller, the printing roller is partially immersed in a glue tank, and one side of the printing roller is a glue applying part, and the other side is a glue applied part, the bubble removing process employs a bubble removing device, the bubble removing device comprises a floating roller floating on the glue in the glue tank, a left roller sleeve and a right roller sleeve coaxially sleeving the left and right ends of the floating roller, wherein the left and right roller sleeves separate the floating roller and the printing roller, and the lower part of the floating roller is at most half below the liquid surface of the glue; the floating roller is provided with spiral drainage grooves, and the bubble removing process comprises the following steps: 1) the left and right ends of the floating roller are above the left and right ends of the printing roller, the printing roller is between the left and right roller sleeves, and the left and right ends of the floating roller are freely in contact with the inner side of the glue tank; 2) the printing roller rotates, the left and right roller sleeves rotate towards each other, the floating roller rotates synchronously, and the glue between the glue applying part of the printing roller and the floating roller is drained from the middle to the left and right ends, so that the bubbles adhering to the glue applying part are discharged to the left and right ends and / or the outer side of the floating roller, and the left and right roller sleeves and the floating roller keep rotating and moving between approaching and moving away from the printing roller with the floating of the glue surface.

2. The bubble removal process for a kiss roll surface of a printed article of claim 1, wherein: In step 2), the stress direction of the printing roller on the left and right roller sleeves is upward and backward along the tangent direction of adhesion, so that the force is decomposed in the horizontal and vertical directions to drive the floating roller, the left and right roller sleeves to rotate and move backward away from the printing roller, and to keep rotating under the inertia.

3. The bubble removal process for a kiss roll surface of a printed article of claim 2, wherein: The forward thrust formed by the glue fluctuation caused by the printing roller pushes the floating roller towards the printing roller again to complete the repeated movement process of relative separation and relative adhesion.

4. The bubble removal process for a kiss roll surface of a printed article of claim 1, wherein: The left and right spiral drainage grooves of the floating roller are spirally wound in opposite directions from the middle to the left and right ends.

5. The bubble removal process for a kiss roll surface of a printed article of claim 4, wherein: The left and right spiral drainage grooves are connected from the middle.

6. The bubble removal process for a kiss roll surface of a printed article of claim 4, wherein: The left and right spiral drainage grooves pass through the inside of the left and right roller sleeves respectively.

7. The bubble removal process for a kiss roll surface of a printed article of claim 4, wherein: The floating roller comprises a hollow tube with left and right spiral drainage grooves on the circumferential surface, and a counterweight tube plug at the two ends of the hollow tube.

8. The bubble removal process for a kiss roll surface of a printed article of claim 1, wherein: The left and right roller sleeves each comprise a sleeve body, wherein the circumferential surface of the sleeve body is provided with protrusions, and the anti-skid rolling grooves are formed between adjacent two protrusions.

9. The bubble removal process for a kiss roll surface of a printed article of claim 8, wherein: The protrusions extend along the length direction of the floating roller and are spaced apart around the circumferential surface of the left and right roller sleeves.

10. The bubble removal process for a kiss roll surface of a printed article of claim 1, wherein: The bubble removing device further comprises a magnetic ring formed on the floating roller and / or the left and right roller sleeves, wherein the adsorption force of the magnetic ring drives the floating roller to keep apart and adhere to the printing roller tangentially from the left and right roller sleeves.

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