A coating defoaming device for thermal paper production

Abstract

The utility model relates to heat sensitive paper production equipment technical field especially relates to a coating defoaming device for heat sensitive paper production, including through pipeline connection's liquid storage tank, defoaming jar, liquid pump, coating material groove, the coating material groove bottom is connected through pipeline and collection groove, the collection groove is connected through pipeline with defoaming jar, defoaming jar includes through flange connection and has the first jar body of primary defoaming subassembly, has the second jar body of secondary defoaming subassembly, has the third jar body of tertiary defoaming subassembly, the utility model discloses through setting up primary defoaming subassembly, secondary defoaming subassembly, tertiary defoaming subassembly respectively in first jar body, second jar body, third jar body carry out bubble to coating liquid gradually defoaming, significantly reduce the bubble content in coating liquid, reduce heat sensitive paper coating after bubble spot, the defect such as leakage coating point, avoid the problem of printing white dot and send virtual problem due to microbubble, do not need to rely on excessive defoaming agent, reduce production cost.

Description

Technical Field

[0001] This utility model relates to the technical field of thermal paper production equipment, and in particular to a coating defoaming device for thermal paper production. Background Technology

[0002] During the coating process of thermal paper, the coating solution is pumped into the coating tank using a pump. The transfer rollers in the coating tank transfer the coating solution onto the thermal paper substrate. Excess coating solution is scraped off by a doctor blade or metering rod. The coating tank is continuously replenished with new coating solution to maintain an overflow. The overflow coating solution collects in a collection tank. This entire process causes an increasing number of air bubbles in the coating solution, especially due to the vigorous agitation by the transfer rollers, which introduces air and generates a large number of bubbles. If these bubbles are not properly removed, bubble spots and missed areas will form after the coating solution dries on the substrate. Poor coating, especially microbubbles, causes white spots and blurry printing on thermal paper. In actual production and coating solution preparation, defoamers are usually added to eliminate some of the foam. However, adding defoamers affects the surface energy of the thermal paper (causing printing defects) and causes defects in subsequent coating layers (such as blooming) during the coating process. Defoamers are expensive, and the defoaming process still takes time. This method is more effective in the early stages of coating. During continuous production, the amount of bubbles will gradually increase, eventually leading to defects such as bubble spots and missed coating. Summary of the Invention

[0003] The purpose of this invention is to address the aforementioned shortcomings in the existing technology by proposing a coating defoaming device for thermal paper production.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] Design a defoaming device for coatings used in thermal paper production, comprising a storage tank, a defoaming tank, a pump, and a coating material tank connected by pipelines. The bottom of the coating material tank is connected to a collection tank via pipelines, and the collection tank is connected to the defoaming tank via pipelines. The defoaming tank includes a first tank body connected by flanges and having a primary defoaming component, a second tank body having a secondary defoaming component, and a third tank body having a tertiary defoaming component. The first tank body is provided with a vacuum port and a feed port. The bottom of the first tank body and the second tank body are respectively provided with a dividing inclined plate, and the dividing inclined plate forms a defoaming channel with the inner wall of the first tank body and the second tank body respectively. The second tank body is provided with staggered guide inclined plates, and a flow guiding channel is formed between adjacent guide inclined plates. The bottom of the third tank body is provided with a discharge port.

[0006] Furthermore, the primary defoaming component includes multiple cones spaced apart on the dividing inclined plate, a cone sleeve rotatably connected to the cones via a rotating part, a first cone tip and a second cone tip spaced apart on the cone sleeve, and a blade disposed at the bottom of the cone sleeve.

[0007] Furthermore, the first and second cone tips are tilted in opposite directions.

[0008] Furthermore, the rotating part includes an annular groove formed along the surface of the cone and a limiting protrusion provided in the inner wall of the cone sleeve and slidingly engaging with the annular groove.

[0009] Furthermore, the secondary defoaming component includes a rotating shaft disposed on the dividing inclined plate, a stirring paddle connected to the rotating shaft, and honeycomb holes formed on the stirring paddle.

[0010] Furthermore, the three-stage defoaming assembly includes a spiral guide plate disposed along the inner wall of the third tank and a buffer groove disposed at the bottom of the third tank.

[0011] Furthermore, the end of the dividing inclined plate is provided with an intercepting plate, and the intercepting plate has multiple through holes.

[0012] The present invention provides a defoaming device for coatings used in the production of thermal paper, which has the following advantages:

[0013] This invention employs a three-stage defoaming system, consisting of a first-stage defoaming component, a second-stage defoaming component, and a third-stage defoaming component, respectively, to defoam the coating liquid in three stages. The first-stage defoaming component utilizes a vacuum environment to reduce the surface tension of bubbles. The second-stage defoaming component uses staggered guide plates to form a flow channel, extending the flow path of the coating liquid and promoting bubble separation. The third-stage defoaming component uses a spiral guide plate to extend the residence time, further eliminating microbubbles. The defoamed coating liquid is then conveyed to the coating tank through the outlet, thereby significantly reducing the bubble content in the coating liquid. This reduces defects such as bubble spots and missed spots after coating thermal paper, avoids white spots and blurry printing caused by microbubbles, eliminates the need for excessive defoaming agents, reduces production costs, and minimizes adverse effects on the surface energy of thermal paper and subsequent coatings. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the defoaming tank structure;

[0016] Figure 3 Schematic diagram of the primary defoaming component;

[0017] Figure 4 This is a schematic diagram of a secondary defoaming component;

[0018] Figure 5 This is a schematic diagram of a three-stage defoaming component; Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0020] Example, refer to Figure 1-5 A defoaming device for coatings used in the production of thermal paper includes a storage tank 10, a defoaming tank 11, a pump 12, and a coating trough 13 connected by pipelines. The bottom of the coating trough 13 is connected to a collection tank 14 via a pipeline, and the collection tank 14 is connected to the defoaming tank 11 via a pipeline. In this embodiment, a transfer roller 15 and a back pressure roller 16 are provided above the coating trough 13. The transfer roller 15 is used to transfer the coating liquid in the coating trough 13 to the thermal paper. The back pressure roller 16 is located above the transfer roller 15 and is used to press the thermal paper against the transfer roller 15. The defoaming tank 11 includes a first tank body 1101 connected by a flange 1104 and having a first-stage defoaming component 1, a second tank body 1102 having a second-stage defoaming component 2, and a third tank body 1103 having a third-stage defoaming component 3. The first tank body 1101 is provided with a vacuum port 1105 and a feed port 1106. 5. Vacuum can be drawn inside the defoaming tank 11. The bottom of the first tank 1101 and the second tank 1102 are respectively provided with a dividing inclined plate 1109. The dividing inclined plate 1109 and the inner wall of the first tank 1101 and the second tank 1102 respectively form a defoaming channel 1107. The coating liquid enters the first tank 1101 through the feed port 1106 and is defoamed by the first-stage defoaming component 1. Then it enters the second tank 1102 through the defoaming channel 1107 and is defoamed by the second-stage defoaming component 2. Then it enters the third tank 1103 through the defoaming channel 1107 and is defoamed by the third-stage defoaming component 3. The second tank 1102 is provided with staggered guide inclined plates 4. A flow guiding channel 5 is formed between adjacent guide inclined plates 4. The bottom of the third tank 1103 is provided with a discharge port 1108. The defoamed coating liquid is transported to the coating material tank 13 through the discharge port 1108 for coating thermal paper.

[0021] This invention employs a first-stage defoaming component 1, a second-stage defoaming component 2, and a third-stage defoaming component 3, respectively, in the first tank 1101, the second tank 1102, and the third tank 1103, to progressively defoam the coating liquid. The first-stage defoaming component 1 utilizes a vacuum environment to reduce the surface tension of bubbles. The second-stage defoaming component 2 forms a flow channel 5 through staggered distribution of guide plates 4, extending the flow path of the coating liquid and promoting bubble separation. The third-stage defoaming component 3 extends the residence time through a spiral guide plate, further eliminating microbubbles. The defoamed coating liquid is then conveyed to the coating tank 13 through the outlet 1108, thereby significantly reducing the bubble content in the coating liquid, reducing defects such as bubble spots and missed coating points after thermal paper coating, avoiding printing white spots and blurring caused by microbubbles, eliminating the need for excessive defoaming agents, reducing production costs, and minimizing adverse effects on the surface energy of thermal paper and subsequent coatings.

[0022] In an optional embodiment of this utility model, the primary defoaming component 1 includes multiple cones 101 spaced apart on the dividing inclined plate 1109, a cone sleeve 103 rotatably connected to the cones 101 via a rotating part 102, a first cone tip 104 and a second cone tip 105 spaced apart on the cone sleeve 103, and a blade 106 disposed at the bottom of the cone sleeve 103. The cone sleeve 103 is rotatably connected to the cones 101 via the rotating part 102. The blade 106 drives the cone sleeve 103 to rotate. The first cone tip 104 and the second cone tip 105 tilt in opposite directions to form a shearing force, which tears and breaks the bubbles. Through the combination of mechanical shearing and rotational centrifugal force, large-sized bubbles are quickly destroyed, thereby improving the defoaming efficiency.

[0023] In an optional embodiment of this invention, the first cone tip 104 and the second cone tip 105 are tilted in opposite directions, forming an alternating shearing region during rotation, which enhances the eddy disturbance inside the liquid and expands the bubble bursting range.

[0024] In an optional embodiment of this utility model, the rotating part 102 includes an annular groove 1021 formed along the surface of the cone 101 and a limiting protrusion 1022 provided on the inner wall of the cone sleeve 103 and slidingly engaged with the annular groove 1021. The cone sleeve 103 slides with the annular groove 1021 on the cone 101 through the limiting protrusion 1022, ensuring that the cone sleeve 103 maintains a stable trajectory during rotation, avoiding deviation, ensuring precise engagement between the cone sleeve 103 and the cone 101, and maintaining stable shearing and defoaming performance.

[0025] In an optional embodiment of this utility model, the secondary defoaming component 2 includes a rotating shaft 201 disposed on the dividing inclined plate 1109, a stirring paddle 202 connected to the rotating shaft 201, and honeycomb holes 203 formed on the stirring paddle 202. Preferably, in this embodiment, the rotating shaft 201 can be driven by a magnetic coupling to achieve leak-free transmission in a vacuum environment; the stirring paddle 202 is driven by a magnetic coupling to rotate and stir the coating liquid in a vacuum environment, and the honeycomb holes 203 disperse the liquid flow, increase the contact area between the bubbles and the stirring paddle, and enhance the bubble breaking efficiency. Especially for micro bubbles, the eddy current generated by stirring further separates the bubbles from the liquid.

[0026] In an optional embodiment of this utility model, the three-stage defoaming component 3 includes a spiral guide plate 301 arranged along the inner wall of the third tank 1103 and a buffer groove 302 arranged at the bottom of the third tank 1103. Preferably, in this embodiment, the bottom of the buffer groove 302 is connected to the outlet 1108. The spiral guide plate 301 guides the coating liquid to flow spirally along the inner wall of the tank, prolonging the residence time. The buffer groove 302 reduces the liquid flow velocity and promotes the floating and breaking of residual bubbles.

[0027] In an optional embodiment of this utility model, the end of the dividing inclined plate 1109 is provided with an intercepting plate 6, and the intercepting plate 6 is provided with a plurality of through holes 601. The intercepting plate 6 with through holes 601 at the end of the dividing inclined plate 1109 controls the liquid flow speed and intercepts the foam that has not been completely defoamed. The through hole design balances the liquid flow pressure and prevents bubbles from entering the next tank with the high-speed liquid flow. The intercepting plate 6 physically blocks the foam and ensures that only the defoamed liquid enters the subsequent process.

[0028] In the description of this specification, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing the technical solution of this patent and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this patent application.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this patent application, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0030] In this specification, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this specification according to the specific circumstances.

[0031] In this specification, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0032] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

Claims

1. A defoaming device for coatings used in the production of thermal paper, comprising a storage tank (10), a defoaming tank (11), a pump (12), and a coating material tank (13) connected by pipelines, wherein the bottom of the coating material tank (13) is connected to a collection tank (14) via a pipeline, and the collection tank (14) is connected to the defoaming tank (11) via a pipeline, characterized in that: The defoaming tank (11) includes a first tank (1101) connected by a flange (1104) and having a first-stage defoaming component (1), a second tank (1102) having a second-stage defoaming component (2), and a third tank (1103) having a third-stage defoaming component (3). The first tank (1101) is provided with a vacuum port (1105) and a feed port (1106). The bottom of the first tank (1101) and the second tank (1102) are respectively provided with a dividing inclined plate (1109). The dividing inclined plate (1109) forms a defoaming channel (1107) with the inner wall of the first tank (1101) and the second tank (1102). The second tank (1102) is provided with staggered guide inclined plates (4). A flow guiding channel (5) is formed between adjacent guide inclined plates (4). The bottom of the third tank (1103) is provided with a discharge port (1108).

2. The defoaming device for coatings used in thermal paper production according to claim 1, characterized in that: The primary defoaming component (1) includes a plurality of cones (101) spaced apart on the partition plate (1109), a cone sleeve (103) rotatably connected to the cones (101) via a rotating part (102), a first cone tip (104) and a second cone tip (105) spaced apart on the cone sleeve (103), and a blade (106) at the bottom of the cone sleeve (103).

3. The defoaming device for coatings used in thermal paper production according to claim 2, characterized in that: The first cone tip (104) and the second cone tip (105) are tilted in opposite directions.

4. The defoaming device for coatings used in thermal paper production according to claim 2, characterized in that: The rotating part (102) includes an annular groove (1021) formed along the surface of the cone (101) and a limiting protrusion (1022) provided in the inner wall of the cone sleeve (103) and slidingly engaged with the annular groove (1021).

5. The defoaming device for coatings used in thermal paper production according to claim 1, characterized in that: The secondary defoaming component (2) includes a rotating shaft (201) disposed on the dividing inclined plate (1109), a stirring paddle (202) connected to the rotating shaft (201), and honeycomb holes (203) formed on the stirring paddle (202).

6. The defoaming device for coatings used in thermal paper production according to claim 1, characterized in that: The three-stage defoaming component (3) includes a spiral guide plate (301) arranged along the inner wall of the third tank (1103) and a buffer groove (302) arranged at the bottom of the third tank (1103).

7. The defoaming device for coatings used in thermal paper production according to claim 1, characterized in that: The end of the dividing inclined plate (1109) is provided with an intercepting plate (6), and the intercepting plate (6) has multiple through holes (601).

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