Adhesive vacuumizing device

Abstract

The utility model relates to the technical field of adhesive processing equipment, in particular to an adhesive vacuumizing device which comprises a feeding pipe, a casting plate, a collecting tank, a vacuum cavity, a vacuum pump, a discharging pipe and a gear pump, the side face of the vacuum cavity is communicated with the feeding pipe, the vacuum cavity is communicated with the vacuum pump, the casting plate and the collecting tank are arranged in the vacuum cavity, and the discharging pipe is communicated with the gear pump. The higher side of the casting plate is connected with the inner wall of the vacuum cavity close to the lower portion of the side where the feeding pipe is located, the lower side of the casting plate is connected with the inner side of the collecting tank, the bottom of the collecting tank is communicated with the outer side of the vacuum cavity through the discharging pipe, the discharging pipe at least comprises a vertical section which is vertically arranged, and the end, away from the collecting tank, of the discharging pipe is communicated with the gear pump. The continuous defoaming device can be used for continuous defoaming pretreatment of the adhesive to be fed, and has the advantages of simple structure and good defoaming treatment effect.

Description

Technical Field

[0001] The utility model relates to the technical field of adhesive treatment equipment, in particular to a vacuum pumping device for adhesives. Background Art

[0002] Copper clad laminates and printed circuit boards are widely used in the production and manufacturing process of electronic devices, and their performance and quality have an important impact on the stability and service life of electronic products. In the manufacturing of copper clad laminates, adhesives are usually used to firmly bond copper foils with substrates to form strong and reliable circuit layers. However, during the production, storage, and transportation of adhesives, bubbles often occur due to reasons such as stirring, mixing, or pipeline transportation. If these bubbles are not effectively discharged in a timely manner during subsequent coating and pressing processes, voids and weak bonding areas may appear in the copper clad laminate, thereby affecting the overall strength and electrical performance of the circuit board.

[0003] Currently, the widely used methods for degassing adhesives in the market mainly include static vacuum degassing and mechanical stirring degassing. In static vacuum degassing, the adhesive is placed in a vacuum environment for a certain period of time to reduce the volume of internal bubbles and promote their escape. However, this method has low efficiency, and in actual use, it is prone to incomplete degassing or the generation of new bubbles. At the same time, as the adhesive flows during coating and transportation, bubbles may mix into the adhesive again, resulting in a decline in subsequent bonding quality. Therefore, it is difficult for the existing technology to completely solve the problem of bubble residue in the production and use of adhesives.

[0004] In order to meet the more efficient degassing requirements of adhesives during production, it is necessary to develop a device that can efficiently and continuously perform degassing treatment before the transportation and coating of adhesives to ensure that there are no bubble residues in the adhesive before coating, so as to improve the quality and reliability of copper clad laminates and printed circuit boards. Summary of the Utility Model

[0005] In view of this, the utility model provides a vacuum pumping device for adhesives, aiming to enable continuous degassing of adhesives through an optimized structural design.

[0006] The technical solution of the utility model is realized as follows. The utility model provides a vacuum pumping device for adhesives, including: a feed pipe, a casting plate, a collection tank, a vacuum chamber, a vacuum pump, a discharge pipe, and a gear pump. The side of the vacuum chamber is connected to the feed pipe, the vacuum chamber is connected to the vacuum pump, a casting plate and a collection tank are arranged in the vacuum chamber, the higher side of the casting plate is connected to the inner wall of the vacuum chamber near the lower side of the feed pipe, the lower side of the casting plate is connected to the inner side of the collection tank, the bottom of the collection tank is connected to the outside of the vacuum chamber through the discharge pipe, the discharge pipe at least includes a vertically arranged vertical section, and the end of the discharge pipe away from the collection tank is connected to the gear pump.

[0007] In the above embodiments, the higher side edge and the two inclined side edges of the casting plate are in close contact with the inner wall of the vacuum chamber, and the lower side edge is in close contact with the inner wall of the collection tank. After the adhesive to be processed from the feed pipe flows into the casting plate, under the action of gravity, it flows towards the lowest side of the casting plate. During the flowing process, the casting plate helps to spread out the adhesive, thereby expanding the surface area of the adhesive and reducing the liquid film thickness. At this time, under a relatively low vacuum degree, the defoaming treatment of the adhesive can be realized. The casting process basically satisfies the laminar flow motion. Therefore, the defoamed adhesive finally flows into the collection tank to achieve the defoaming purpose. The collection tank is used to collect the defoamed adhesive and discharge it through the discharge pipe at the bottom. The discharge pipe is provided with at least one vertical section, aiming to use the liquid column of the adhesive in the vertical section to counteract the air pressure in the vacuum chamber and prevent the discharge from being unable to be discharged.

[0008] In some embodiments, a heating device is further included, and the heating device is arranged below the casting plate.

[0009] In the above embodiments, the heating device is used to heat the casting plate, so that the viscosity of the adhesive on the casting plate can be adjusted to prevent the adhesive with too high viscosity from flowing down smoothly.

[0010] In some embodiments, a plurality of stepped surfaces are arranged at intervals along the slope direction on the upper surface of the casting plate.

[0011] In the above embodiments, the stepped surface includes a horizontal surface and a vertical surface. The horizontal surface can serve as a buffer area to reduce the flow rate of the adhesive, which is beneficial to the deep defoaming of the adhesive with high viscosity. The vertical surface is beneficial to quickly expose the liquid film near the casting plate side and accelerate the deep defoaming. The stepped surface can be a convex stepped surface or a concave stepped surface, and preferably a convex stepped surface.

[0012] In some embodiments, the number of feed pipes is multiple, and the multiple feed pipes are arranged in parallel at intervals along the width direction of the casting plate.

[0013] In the above embodiments, in order to enable the fed adhesive to quickly spread on the surface of the casting plate, multiple parallel feed pipes are provided for feeding, which is beneficial to the uniform distribution and quick spreading of the fed adhesive along the width direction on the surface of the casting plate.

[0014] In some embodiments, the height of the vertical section is 2 - 150 mm.

[0015] In the above embodiments, according to the magnitude of the vacuum degree, the requirements for the liquid column height of the vertical section to counteract the vacuum are also different. In the conventional vacuum degree range of 0.1 torr - 10 torr, the corresponding liquid column height is optimally 2 - 150 mm.

[0016] In some embodiments, the angle between the casting plate and the horizontal plane is 30 - 60°.

[0017] The utility model has the following beneficial effects compared with the prior art:

[0018] The utility model provides a vacuum pumping device for adhesives, which is used for pretreatment degassing before adhesive coating. The casting plate is adopted to perform continuous flow degassing treatment on the adhesive, so that continuous degassing can be realized. The degassed adhesive is collected through the collecting tank and centrally output. This structure can be used in production lines such as circuit boards and copper clad laminates to perform pretreatment degassing on the purchased adhesives. The structure is simple, easy to implement, and can perform continuous degassing treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 It is the front view sectional view of the vacuum pumping device for adhesives of the present utility model;

[0021] Figure 2 It is the top view of the vacuum pumping device for adhesives of the present utility model.

[0022] In the figure: 1 - feed pipe, 2 - casting plate, 3 - collecting tank, 4 - vacuum chamber, 5 - vacuum pump, 6 - discharge pipe, 7 - gear pump, 8 - heating device, 21 - stepped surface, 61 - vertical section. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments of the present utility model belong to the scope of protection of the present utility model.

[0024] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0025] It should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0026] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality of" means two or more, unless otherwise specifically defined.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which the embodiments of the present invention belong. If the definitions stated in this part are contrary to or otherwise inconsistent with the definitions stated in the patents, patent applications, published patent applications, and other publications incorporated herein by reference, the definitions listed in this part shall prevail over the definitions incorporated herein by reference.

[0028] As Figure 1 shown, in combination with Figure 2 , the adhesive vacuuming device of the present utility model includes: a feed pipe 1, a casting plate 2, a collection tank 3, a vacuum chamber 4, a vacuum pump 5, a discharge pipe 6, and a gear pump 7. The side of the vacuum chamber 4 is communicated with the feed pipe 1, the vacuum chamber 4 is communicated with the vacuum pump 5, a casting plate 2 and a collection tank 3 are arranged in the vacuum chamber 4. The higher side of the casting plate 2 is connected to the inner wall of the vacuum chamber 4 below the side where the feed pipe 1 is located, the lower side of the casting plate 2 is connected to the inner side of the collection tank 3, the bottom of the collection tank 3 is communicated with the outside of the vacuum chamber 4 through the discharge pipe 6. The discharge pipe 6 at least includes a vertically arranged vertical section 61, and the end of the discharge pipe 6 away from the collection tank 3 is communicated with the gear pump 7.

[0029] The adhesive to be processed enters above the casting plate 2 through the feed pipe 1. Under the action of gravity, the adhesive flows downward on the upper surface of the casting plate 2. During the flowing process, a liquid film of the adhesive is formed on the surface of the casting plate 2. The vacuum pump 5 evacuates to form a negative pressure. Under the action of the negative pressure, the liquid film of the adhesive on the surface of the casting plate 2 starts to defoam. And due to the surface tension, the liquid film tends to have a larger surface area and a smaller thickness. At this time, it is easier to carry out rapid defoaming. The defoamed liquid film finally flows into the collection tank 3. After converging in the collection tank 3, it flows into the discharge pipe 6. The vertical section 61 in the discharge pipe 6 is used to fill the adhesive to form a liquid column. The gravity of the liquid column is used to counteract the negative pressure in the vacuum chamber 4, so as to maintain the stability of the negative pressure in the vacuum chamber 4. Under the action of the liquid column, the defoamed adhesive can also continue to flow out and is output through the gear pump 7 at the tail end.

[0030] In some embodiments, it further includes a heating device 8, and the heating device 8 is arranged below the casting plate 2.

[0031] The heating device is used to heat the casting plate 2, which is beneficial to reducing the viscosity of the liquid film above the casting plate 2 and making the liquid film easier to flow and defoam.

[0032] In some embodiments, a plurality of stepped surfaces 21 are arranged at intervals along the slope direction on the upper surface of the casting plate 2.

[0033] The stepped surface 21 includes a connected horizontal surface and a vertical surface. The horizontal surface reduces the flow rate of the liquid film. At this time, the bubbles at the bottom of the liquid film are easier to escape. The vertical surface can promote the convection between the surface layer and the bottom layer of the liquid film, and further promote the removal of bubbles in the bottom liquid film.

[0034] In some embodiments, the number of the feed pipes 1 is multiple, and the multiple feed pipes 1 are arranged in parallel at intervals along the width direction of the casting plate 2.

[0035] In some embodiments, the height of the vertical section 61 is 2 - 150 mm.

[0036] In some embodiments, the angle formed by the casting plate 2 and the horizontal plane is 30 - 60°.

[0037] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A vacuum device for adhesives, characterized in that Including: A feed pipe (1), a casting plate (2), a collection tank (3), a vacuum chamber (4), a vacuum pump (5), a discharge pipe (6) and a gear pump (7). The side of the vacuum chamber (4) is communicated with the feed pipe (1), and the vacuum chamber (4) is communicated with the vacuum pump (5). A casting plate (2) and a collection tank (3) are arranged in the vacuum chamber (4). The higher side of the casting plate (2) is connected to the inner wall of the vacuum chamber (4) below the side where the feed pipe (1) is located, and the lower side of the casting plate (2) is connected to the inner side of the collection tank (3). The bottom of the collection tank (3) is communicated with the outside of the vacuum chamber (4) through the discharge pipe (6). The discharge pipe (6) at least includes a vertically arranged vertical section (61), and the end of the discharge pipe (6) far from the collection tank (3) is communicated with the gear pump (7).

2. The adhesive vacuuming device according to claim 1, characterized in that, It further includes a heating device (8), and the heating device (8) is arranged below the casting plate (2).

3. The adhesive vacuuming device according to claim 1, characterized in that, A plurality of stepped surfaces (21) are arranged at intervals along the slope direction on the upper surface of the casting plate (2).

4. The adhesive vacuuming device according to claim 1, wherein, The number of the feed pipes (1) is multiple, and the multiple feed pipes (1) are arranged in parallel at intervals along the width direction of the casting plate (2).

5. The adhesive vacuuming device according to claim 1, characterized in that, The height of the vertical section (61) is 2 - 150 mm.

6. The adhesive vacuuming device according to claim 1, wherein The angle formed by the casting plate (2) and the horizontal plane is 30 - 60°.

Images