Apparatus and method for surface covering of a ribbon of brazing material with pressure sensitive adhesive film and polyethylene film

Abstract

The application provides a device and a method for covering a band-shaped brazing filler material with a pressure-sensitive adhesive film and a polyethylene film. The device comprises, in sequence, a band-shaped brazing filler material unwinding roller (1), a guide roller (1-2), an upper silicon release paper winding roller (2), a pressure-sensitive adhesive film roller (3), a lower silicon release paper winding roller (4), a pressure-sensitive adhesive unwinding roller (5), a polyethylene film unwinding roller (6), a polyethylene film coating roller (7), and a brazing filler material winding roller (8). Compared with a traditional film coating process, the process improves production efficiency, solves the problems of film coating difficulty of the band-shaped brazing filler material, low production efficiency, and environmental pollution, and the like.

Description

Technical Field

[0001] This invention belongs to the field of brazing material preparation, specifically relating to a process for preparing adhesive brazing tape by coating the surface of a strip brazing filler metal with a pressure-sensitive adhesive film and a polyethylene film. Background Technology

[0002] Brazing is a joining method that uses a filler metal (such as welding wire, welding ring, or strip filler metal) with a melting point lower than that of the base material to fill the joint gap under capillary action and diffuse with the base material to form a metallurgical bond. The base material does not melt, and it is suitable for high-strength joining of precision and dissimilar materials.

[0003] Brazing is primarily used in the aerospace field for joining refractory materials such as high-temperature alloys and titanium alloys, including critical components like engine blades, turbine guide vanes, and combustion chamber assemblies. Vacuum brazing and high-frequency induction brazing are the mainstream processes, avoiding oxidation and achieving precision welding, suitable for honeycomb structures, ducts, and satellite microwave devices. Its advantages include low deformation, joining dissimilar materials, and efficient forming of complex components.

[0004] The main raw material used in brazing is brazing filler metal. Because brazing filler metal contains a variety of melting point-reducing elements, it is brittle and has poor formability, making it difficult to form using traditional methods such as deformation rolling. Therefore, it is usually supplied in powder form. However, for honeycomb or large-area brazing structures, such as honeycomb sealing structures and heat exchangers, brazing filler metal needs to be applied evenly to the large brazing surface. But adding powdered brazing filler metal presents many inconveniences, such as difficulty in controlling the amount added and difficulty in positioning the filler metal. Therefore, a sheet-like addition method is required.

[0005] Strip brazing filler metal is a soft strip material made by mixing metal brazing filler metal powder with a binder. It can achieve precise addition and positioning of brazing filler metal over a large area. It has the advantages of high assembly efficiency, precise control, excellent quality and easy automation assembly, making it the preferred method to solve the problem of brazing filler metal addition for this type of structure.

[0006] Because the surface of the strip brazing filler metal is non-adhesive, it presents many inconveniences during use, especially for vertical and inverted welds, where the strip brazing filler metal cannot be directly adhered to the workpiece surface. Therefore, in most cases, a thin layer of pressure-sensitive adhesive is applied to one side of the strip brazing filler metal to create an adhesive surface that allows it to adhere to the base material to be welded.

[0007] One side of the adhesive strip solder is a pressure-sensitive adhesive film layer, and the other side is a polyethylene film with a thickness ranging from 0.05 mm to 0.15 mm. The polyethylene film not only serves as packaging but also prevents contamination of the adhesive strip solder. Furthermore, when welding honeycomb structures, the elasticity of the polyethylene film makes it easier to roll the adhesive strip solder completely into the honeycomb core, thus simplifying the construction process. Figure 4(a) shows a schematic diagram of a conventional composite strip solder, and Figure 4(b) shows a schematic diagram of the adhesive strip solder prepared according to this method.

[0008] The adhesive solder has a three-layer composite structure. The bottom layer is a polyethylene film, the middle layer is a strip of solder made of solder metal powder and binder, the upper surface of the strip is a 15μm~20μm thick pressure-sensitive adhesive film, and the top layer is a silicone release paper that provides protection and support. In use, the release paper film, pre-cut to the shape of the soldering surface, is peeled off to expose the pressure-sensitive adhesive layer. The solder is then applied along the adhesive layer to the surface to be soldered. The other side of the polyethylene film is then peeled off, completing the addition and fixation of the solder.

[0009] The amount of solder used is precisely controlled by the thickness of the adhesive solder tape. Depending on the application requirements, the adhesive solder tape can be made in different thicknesses, ranging from 0.1mm to 1.0mm. The length and width meet the requirements for overall solder addition. The width is usually around 100mm or cut into specific widths, such as 15mm or 20mm. The length is continuous and rolled, usually more than 5m.

[0010] Currently, the main method for coating pressure-sensitive adhesive (PSA) films onto the surface of solder strips is the coating process. Specifically, the coating method first involves mixing the PSA with a solvent in a specific ratio to form a homogeneous solution. Then, the PSA solution is uniformly coated onto the surface of the solder strip using methods such as blade coating, roller / gravure coating, or slot extrusion coating. Finally, drying or curing is used to form a PSA film. In the coating process, using a large amount of solvent to dissolve the PSA and then drying it is a common practice. However, this process has significant drawbacks: it consumes a large amount of solvent, and solvent evaporation during drying poses hazards to the environment and operators. Furthermore, due to the need for drying, this method is not suitable for large-scale mass production. Summary of the Invention

[0011] The technical problem of this invention is:

[0012] Current technology requires the consumption of large amounts of solvent, and solvent evaporation during the drying process poses hazards to the environment and operators. Furthermore, due to the need for drying, this method is not suitable for large-scale mass production.

[0013] The purpose of this invention is: This invention aims to create an adhesive solder by applying a thin pressure-sensitive adhesive layer to one side of a strip-shaped solder, giving it an adhesive surface layer that allows it to adhere to the surface of the base material to be soldered. One surface of the adhesive solder is a pressure-sensitive adhesive film layer, while the other surface is a polyethylene film with a thickness ranging from 0.05mm to 0.15mm. The polyethylene film serves to package and prevent contamination of the adhesive solder. Furthermore, when soldering honeycomb structures, the elasticity of the polyethylene film makes it easier to roll the adhesive solder completely into the honeycomb core, thus simplifying the process.

[0014] The technical solution of this invention is: On one hand, this invention proposes a production device for coating strip solder with pressure-sensitive adhesive film and polyethylene film. The strip solder coating production line consists of, in sequence, a strip solder unwinding roller (1), guide rollers (1-2), an upper silicone release paper take-up roller (2), a pressure-sensitive adhesive film coating roller (3), a lower silicone release paper take-up roller (4), a pressure-sensitive adhesive unwinding roller (5), a polyethylene film unwinding roller (6), a polyethylene film coating roller (7), and a solder adhesive tape take-up roller (8). All components are individually arranged on the production line platform and connected together through the production line during operation. The process parameters of each component are controlled by a PLC main terminal. The main functions of each component are as follows: The strip brazing filler unwinding roller (1) is a tension unwinding roller, which mainly plays the role of supporting and unwinding. In actual use, the composite strip brazing filler prepared into a roll is first placed on the unwinding roller, and then the tension is adjusted to between 0.05N and 0.25N.

[0015] The guide rollers (1-2) are transition guide rollers with no power traction. Their main function is to peel off the silicon release paper (101) from the composite strip solder.

[0016] The silicone release paper take-up roller (2) is a torque motor driven roller, which is mainly responsible for peeling off the silicone release paper (101) of the composite strip solder, exposing the upper surface of the strip solder, and then automatically winding up the peeled silicone release paper (101).

[0017] The pressure-sensitive adhesive film coating roller (3) is a coating roller for pressure-sensitive adhesive. Its main function is to transfer and attach a 15μm~20μm pressure-sensitive adhesive layer from the surface of the rolled pressure-sensitive adhesive film (300) to the surface of the strip solder. The specific structural diagram of the roller is shown below. Figure 3 As shown, in order to ensure the coating effect, the pressure applied by the upper and lower rollers of the pressure-sensitive adhesive film roller (3) is not less than 2000N. At the same time, in order to avoid the tension of the pressure-sensitive adhesive film unwinding roller affecting the pressure applied by the upper and lower rollers, a special design was made for the structure of the two rollers applying pressure. Through the structure of two figure-eight rings (3-5) with springs, the pressure is applied through the lower roller, thus avoiding the influence of the tension of the pressure-sensitive adhesive film unwinding roller on the pressure applied by the upper and lower rollers.

[0018] The lower silicone release paper take-up roller (4) is a torque motor driven roller, whose main function is to peel off the lower silicone release paper (102) on the lower surface of the composite strip brazing filler metal and then automatically rewind it.

[0019] The polyethylene film coating roller (7) is a coating roller for polyethylene film. Its main function is to attach the polyethylene film (400) located on the polyethylene film unwinding roller to the lower surface of the strip brazing filler (200).

[0020] The adhesive tape take-up roller (8) is a take-up roller driven by a torque motor. Its main function is to take up the adhesive tape after the coating is completed.

[0021] On the other hand, the present invention proposes a preparation method, which is specifically implemented through the following steps: 1) Raw material preparation: ① Roll of pressure-sensitive adhesive film 300 (a composite pressure-sensitive adhesive film formed by uniformly coating a pressure-sensitive adhesive solution onto silicone release paper, the thickness of the pressure-sensitive adhesive solution being 15μm~20μm, the pressure-sensitive adhesive solution being an acrylic pressure-sensitive adhesive, the silicone release paper being glassine paper, its surface peel strength being less than 0.15N / 25mm, and the 180-degree peel strength of the pressure-sensitive adhesive film being not less than 0.05KN / m), ② Roll of composite strip solder, composed of upper silicone release paper 101, strip solder 200, and lower silicone release paper 102. ③ Roll of polyethylene film 400.

[0022] 2) Place the strip brazing filler metal on the unwinding roller (1), and peel off the silicone release paper (101) of the strip brazing filler metal (200) by the silicone release paper take-up roller (2) and guide roller (1-2); 3) The pressure-sensitive adhesive film roller (3) applies pressure to tightly adhere the pressure-sensitive adhesive film (300) to the upper surface of the strip solder (200). At the same time, the lower silicone release paper take-up roller (4) peels off the lower silicone release paper (102) of the strip solder and winds it up.

[0023] 4) Under the action of the adhesive surface of the pressure-sensitive adhesive film, the strip solder (200) is tightly attached to the pressure-sensitive adhesive film (300), and will not fall off after the lower silicone release paper (102) is peeled off.

[0024] 5) The polyethylene film (400) located on the polyethylene film unwinding roller (6) is applied to the lower surface of the strip brazing material by the polyethylene film coating roller (7).

[0025] 6) The coated strip of brazing filler metal is wound up by the adhesive brazing filler metal take-up roller (8) to form an adhesive brazing filler metal product with a pressure-sensitive adhesive film (300) on one side and a polyethylene film (400) on the other side.

[0026] Among them, the pressure-sensitive adhesive film roller (3) applies a force of not less than 2000N to make the pressure-sensitive adhesive film (300) adhere tightly to the upper surface of the strip brazing filler metal (200).

[0027] Preferably, the pressure-sensitive adhesive film-coated roller (3) adopts a double-roller calendering structure, mainly composed of (3-1) a lower base, (3-2) an upper support plate, (3-3) an upper pressure roller, (3-4) a lower pressure roller, (3-5) a figure-eight ring, (3-6) a spring, (3-7) a sleeve assembly, and (3-8) a lever assembly. The roller surface of the double roller is made of silicone material with a Shore hardness of 70~75, and mainly consists of (3-9) a bearing, (3-10) a pressing shaft, and a silicone roller surface.

[0028] Preferably, the peel force of the lower silicone release paper (102) is 0.03N / 25mm to 0.15N / 25mm, and the peel force of the upper silicone release paper (101) is 0.25N / 25mm to 0.40N / 25mm.

[0029] Preferably, the unwinding tension of the strip unwinding roller (1), the pressure-sensitive adhesive unwinding roller (5), and the polyethylene film unwinding roller (6) is between 0.05N and 0.25N.

[0030] Preferably, the thickness of the polyethylene film (400) is between 0.08mm and 0.15mm, and it can be different colors such as blue, red, and yellow to distinguish products of different specifications.

[0031] The advantages and beneficial effects of this invention are: 1) The first integrated process of simultaneous peeling and lamination enables efficient peeling of the upper and lower silicone release paper and continuous lamination of pressure-sensitive adhesive film and polyethylene film, significantly improving production efficiency and product consistency; 2) Traditional lamination processes typically require multiple steps, while this design, through precise spatial layout and timing control, enables the sequential peeling of the upper and lower silicone release liner from the strip solder, as well as the sequential lamination of the pressure-sensitive adhesive film and the polyethylene film. This not only significantly shortens processing time but also reduces the risk of damage or contamination that may occur during material transfer between processes.

[0032] 3) Automation: From unwinding, peeling, laminating to rewinding, the entire process is automated and continuous, greatly reducing reliance on manual operation and helping to ensure product consistency and large-scale production.

[0033] 4) Innovative Structure of Pressure-Sensitive Adhesive Coating Roller: The pressure-sensitive adhesive coating roller adopts a calendering structure combining upper and lower pressure rollers. The roller surface is made of silicone material with a specific hardness, ensuring uniform pressure and preventing air bubbles or wrinkles. More uniquely, it integrates two figure-eight rings internally. Figure 3As shown in Figure 3-5, the design incorporates a spring-loaded pressure assembly. This design absorbs and buffers fluctuations caused by the material unwinding tension, while simultaneously preventing the tension of the pressure-sensitive adhesive film unwinding roller from affecting the pressure applied to the upper and lower rollers. This ensures that the pressure applied to the material is stable and not less than 2000N, thereby guaranteeing the reliability of pressure-sensitive adhesive transfer and bonding quality. These process parameters are the optimal parameters that have been repeatedly verified.

[0034] 5) This invention employs environmentally friendly pressure-sensitive adhesive film transfer technology, unlike traditional coating processes that heavily utilize organic solvents. By directly transferring a pre-formed pressure-sensitive adhesive film to the solder surface using roller pressing technology, it not only reduces the use of organic solvents but also improves production efficiency. This method avoids the emission of volatile organic compounds (VOCs) at the source, better meeting the requirements of green manufacturing.

[0035] 6) Introducing colored polyethylene film markings: Different colored polyethylene films are used for bonding solder of different thicknesses. This allows the polyethylene film to not only provide protection against pollution and scratches, but also serve as a visual identifier for product specifications in different colors (such as blue, red, and yellow). This effectively prevents misuse in complex assembly and improves the precision of production management.

[0036] Overall, the value of this patent lies in its systematic solution to three major pain points in the application of strip brazing filler metals in high-precision fields such as aerospace: difficulty in positioning vertical weld seams, low production efficiency, and the environmental unfriendliness of traditional processes. It is not a breakthrough in a single technology, but rather a collaborative innovation in processes, equipment, and materials that creates an efficient, reliable, and environmentally friendly solution, providing strong support for high-quality brazing manufacturing.

[0037] Attached Figure Description To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of a process for preparing adhesive strip solder by coating the surface of a strip solder with a pressure-sensitive adhesive film and a polyethylene film. Figure 2 This is a magnified view of a portion of the flowchart; Figure 3 This is a schematic diagram of the structure of the pressure-sensitive adhesive coating roller (3); Figure 4(a) is a schematic diagram of a conventional composite strip brazing filler metal; Figure 4(b) is a schematic diagram of the adhesive solder prepared according to an embodiment of the present invention; Figure 5(a) is a schematic diagram of a honeycomb structure welded using adhesive brazing filler metal according to an embodiment of the present invention; Figure 5(b) is a schematic diagram of a honeycomb structure welded using adhesive brazing filler metal according to another embodiment of the present invention; Figure 6 This is a schematic diagram of the prepared BNi82CrSiBFe adhesive solder product; Figure 7 This is a schematic diagram of the bonding tape brazing winding.

[0039] in: Strip brazing filler unwinding roller (1), guide rollers (1-2), upper silicone release liner take-up roller (2), pressure-sensitive adhesive film coated roller (3), lower silicone release liner take-up roller (4), pressure-sensitive adhesive unwinding roller (5), polyethylene film unwinding roller (6), polyethylene film coating roller (7), adhesive brazing filler rewinding roller (8), composite strip brazing filler (121), upper silicone release liner (101), roll pressure-sensitive adhesive film (300), roll polyethylene film (400), adhesive brazing filler (324) Lower base (3-1), upper support plate (3-2), upper pressure roller (3-3), lower pressure roller (3-4), figure-eight ring (3-5), spring (3-6), sleeve assembly (3-7), lead screw assembly (3-8), bearing (3-9), pressing shaft (3-10). Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other, and the various embodiments can be referenced and cited in each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0042] Referring to the accompanying drawings, this patent invention discloses a method for coating a strip of solder with a pressure-sensitive adhesive film and a polyethylene film. The original composite strip solder structure is shown in enlarged screenshot A. The method employs a step-by-step coating process, with key steps including two film peeling steps and two film coating steps. First, before coating the upper surface of the composite strip solder with the pressure-sensitive adhesive film, the silicone release paper on the upper surface needs to be peeled off to expose the upper surface of the strip solder. The composite structure of the solder at this time is shown in enlarged screenshot B. Then, the pressure-sensitive adhesive film, which has been pre-coated on the silicone release paper, is transferred to the upper surface of the strip solder using a pressure-sensitive adhesive coating roller (7). This process requires accurate control of the coating pressure to be no less than 2000N. The 180° peel strength is not less than 0.05KN / m, otherwise the strip solder cannot be transferred and adhered to the upper surface. At the same time as the film is applied, the silicone release paper protective film on the lower surface of the strip solder is peeled off by the lower take-up roller. Because the strip solder is adhered to the pressure-sensitive adhesive film on the upper surface, after the lower silicone release paper is peeled off, the strip solder will move forward along the production line with the pressure-sensitive adhesive film. The solder composite structure at this time is shown in the enlarged screenshot C. When the strip solder passes through the polyethylene film coating roller along the production line, the polyethylene film is laminated to the lower surface of the strip solder by the lower unwinding roller. The solder composite structure at this time is shown in the enlarged screenshot D. Finally, the adhesive strip solder is wound up by the take-up roller (8).

[0043] Main applications: The honeycomb sealing structure of aero-engines combines a nickel-based honeycomb structure with a high-temperature alloy casing using a vacuum brazing process. This unique structural design makes adhesive brazing filler metal the preferred material for achieving high-quality brazing connections. During honeycomb structure brazing, the adhesive brazing filler metal is first applied to the honeycomb surface. Then, utilizing the good adhesion and deformability of the adhesive brazing filler metal, it is rolled into the honeycomb core of the turbine outer ring. Finally, the turbine outer ring is fixed to the high-temperature alloy casing and welded together. The specific structure is shown in Figure 5 below.

[0044] Example 1: This embodiment relates to the preparation of a BNi82CrSiBFe adhesive solder tape. The process involves coating the surface of the strip solder with a pressure-sensitive adhesive film and a polyethylene film to prepare the BNi82CrSiBFe adhesive solder tape product.

[0045] 1) First, according to the traditional preparation method, BNi82CrSiBFe solder powder and binder are mixed in a certain proportion, and then rolled into a strip of solder with a thickness of 0.15mm to 0.75mm through processes such as extrusion, rolling and winding.

[0046] 1) The pressure-sensitive adhesive solution is uniformly coated onto the silicone release paper through a coating process to form a pressure-sensitive adhesive layer with a thickness of 15μm~20μm. Then it is wound into rolls for use. The silicone release paper is made of glassine paper, and its surface peel strength is less than 0.15N / 25mm, while the 180-degree peel strength of the pressure-sensitive adhesive film is not less than 0.05KN / m.

[0047] 2) Place the strip brazing filler metal on the unwinding roller (1) and peel off the silicone release paper (101) from the strip brazing filler metal (200) using the silicone release paper take-up roller (2); 3) The pressure-sensitive adhesive film roller (3) applies pressure to tightly adhere the pressure-sensitive adhesive film (300) to the upper surface of the strip solder (200). At the same time, the lower silicone release paper take-up roller (4) peels off the lower silicone release paper (102) of the strip solder and winds it up.

[0048] 4) Under the action of the adhesive surface of the pressure-sensitive adhesive film, the strip solder (200) is tightly attached to the pressure-sensitive adhesive film (300), and will not fall off after the lower silicone release paper (102) is peeled off.

[0049] 5) The polyethylene film (400) located on the polyethylene film unwinding roller (6) is applied to the lower surface of the strip brazing material by the polyethylene film coating roller (7).

[0050] 6) The coated strip of brazing filler metal is wound up by the adhesive brazing filler metal take-up roller (8) to form a BNi82CrSiBFe adhesive brazing filler metal product with a pressure-sensitive adhesive film (300) on one side and a polyethylene film (400) on the other side.

[0051] Example 2: This patent invention discloses a method for coating a strip of solder with a pressure-sensitive adhesive film and a polyethylene film. The method employs a step-by-step coating process, with key steps including two film peeling steps and two film coating steps. First, before coating the strip of solder with the pressure-sensitive adhesive film, the silicone release paper on the upper surface needs to be peeled off to expose the upper surface of the solder. The composite structure of the solder at this point is shown in enlarged screenshot B. Then, the pressure-sensitive adhesive film, previously coated on the silicone release paper, is transferred to the upper surface of the strip of solder using a pressure-sensitive adhesive coating roller (7). This process requires accurate control of the coating pressure to be no less than 2000N, and the 180° peel strength of the pressure-sensitive adhesive tape to be no less than 0.0. 5KN / m, otherwise the strip solder cannot be transferred and adhered to the upper surface. At the same time as the film is applied, the silicone release paper protective film on the lower surface of the strip solder is peeled off by the lower take-up roller. Because the strip solder is adhered to the pressure-sensitive adhesive film on the upper surface, after the lower silicone release paper is peeled off, the strip solder will move forward along the production line with the pressure-sensitive adhesive film. The solder composite structure at this time is shown in the enlarged screenshot C. When the strip solder passes through the polyethylene film coating roller along the production line, the polyethylene film is composited on the lower surface of the strip solder by the lower unwinding roller. The solder composite structure at this time is shown in the enlarged screenshot D. Finally, the adhesive strip solder is wound up by the take-up roller (8).

[0052] It should be noted that the above process operations can be combined to varying degrees. For the sake of brevity, the implementation methods of various combinations will not be elaborated here. Those skilled in the art can flexibly adjust the order of the above operation steps or flexibly combine the above steps according to actual needs.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should be covered within the protection scope of the present invention.

Claims

1. A production apparatus for coating a strip of solder with a pressure-sensitive adhesive film and a polyethylene film, characterized in that, include: The following components are arranged in sequence: a strip brazing filler unwinding roller (1), guide rollers (1-2), upper silicone release paper take-up roller (2), pressure-sensitive adhesive film coating roller (3), lower silicone release paper take-up roller (4), pressure-sensitive adhesive unwinding roller (5), polyethylene film unwinding roller (6), polyethylene film coating roller (7), and adhesive brazing filler unwinding roller (8). The strip brazing filler unwinding roller (1) is a tension unwinding roller, used to place the prepared composite strip brazing filler on the unwinding roller; The guide rollers (1-2) are transition guide rollers with no power traction, used to peel off the silicon release paper (101) on the composite strip solder. The silicone release paper take-up roller (2) is a torque motor driven roller, used to continue peeling off the silicone release paper (101) of the composite strip brazing filler, exposing the upper surface of the strip brazing filler, and then automatically rewinding the peeled silicone release paper (101); The pressure-sensitive adhesive film coating roller (3) is a coating roller for pressure-sensitive adhesive, used to transfer and attach a layer of pressure-sensitive adhesive from the surface of a roll of pressure-sensitive adhesive film (300) to the upper surface of a strip of solder. The lower silicone release paper take-up roller (4) is a torque motor driven roller used to peel off the lower silicone release paper (102) on the lower surface of the composite strip brazing filler metal and then rewind it; Rolled pressure-sensitive adhesive film (300), rolled composite strip brazing filler metal (121) and polyethylene film (400) are respectively mounted on pressure-sensitive adhesive unwinding roller (5), strip brazing filler metal unwinding roller (1) and polyethylene film unwinding roller (6); The polyethylene film coating roller (7) is a coating roller for polyethylene film, used to attach the polyethylene film (400) located on the polyethylene film unwinding roller to the lower surface of the strip brazing filler (200); The adhesive tape take-up roller (8) is a take-up roller driven by a torque motor, used to take up the adhesive tape after coating.

2. The apparatus according to claim 1, characterized in that, in: The composite strip solder includes, from top to bottom, an upper silicon release paper (101), a strip solder (200), and a lower silicon release paper (102). The adhesive solder includes, from top to bottom, the following components: pressure-sensitive adhesive film (300), strip solder (200), and polyethylene film (400).

3. The apparatus according to claim 1, characterized in that, in: The pressure-sensitive adhesive film-coated roller (3) adopts a symmetrical double-roller calendering structure, including: a lower base (3-1), an upper support plate (3-2), an upper pressure roller (3-3), a lower pressure roller (3-4), a figure-eight ring (3-5), a spring (3-6), a sleeve assembly (3-7), a lead screw assembly (3-8), a bearing (3-9), and a pressing shaft (3-10), wherein: The upper pressure roller (3-3) and the lower pressure roller (3-4) are fixed between the lower base (3-1) and the upper support plate (3-2) by a sleeve assembly (3-7); The figure-eight ring (3-5) is connected to the upper support plate (3-2) and the spring (3-6) respectively; The spring (3-6) is connected to the pressure applied by the lower pressure roller (3-4), thereby avoiding the influence of the tension of the pressure-sensitive adhesive film unwinding roller on the magnitude of the pressure applied by the upper and lower rollers.

4. The apparatus according to any one of claims 1-3, characterized in that, in: The pressure applied by the upper and lower rollers of the pressure-sensitive adhesive film roller (3) is not less than 2000N. Through the structure of two figure-eight rings (3-5) and springs (3-6), the pressure is applied by the lower pressure roller (3-4), thereby avoiding the influence of the tension of the pressure-sensitive adhesive film unwinding roller on the pressure applied by the upper and lower rollers.

5. A method for preparing a strip of solder coated with a pressure-sensitive adhesive film and a polyethylene film, using the apparatus according to any one of claims 1-4, characterized in that, The method includes the following steps: S1, Raw material preparation: roll pressure-sensitive adhesive film (300), roll composite strip brazing filler metal, roll polyethylene film (400); wherein: the roll composite strip brazing filler metal includes: upper silicone release paper (101), strip brazing filler metal (200) and lower silicone release paper (102). S2, place the strip brazing filler metal on the unwinding roller (1), and peel off the silicone release paper (101) of the strip brazing filler metal (200) by the silicone release paper take-up roller (2) and guide roller (1-2); S3, the pressure-sensitive adhesive film roller (3) applies pressure to tightly adhere the pressure-sensitive adhesive film (300) to the upper surface of the strip brazing material (200); at the same time, the lower silicone release paper take-up roller (4) peels off the lower silicone release paper (102) of the strip brazing material and takes it up; S4, under the action of the adhesive surface of the pressure-sensitive adhesive film, the strip solder (200) is tightly attached to the pressure-sensitive adhesive film (300), and will not fall off after the lower silicone release paper (102) is peeled off; S5, the polyethylene film (400) located on the polyethylene film unwinding roller (6) is applied to the lower surface of the strip brazing material by the polyethylene film coating roller (7); S6, the coated strip of brazing filler metal is wound up by the adhesive brazing filler metal take-up roller (8) to form an adhesive brazing filler metal product with a pressure-sensitive adhesive film (300) on one side and a polyethylene film (400) on the other side.

6. The method according to claim 5, characterized in that, in: Rolled pressure-sensitive adhesive film (300) is a composite pressure-sensitive adhesive film formed by uniformly coating a pressure-sensitive adhesive solution onto silicone release paper, wherein: The thickness of the pressure-sensitive adhesive solution is 15μm-20μm. The pressure-sensitive adhesive solution uses acrylic pressure-sensitive adhesive, and the silicone release paper uses glassine paper. Its surface peel strength is less than 0.15N / 25mm, while the 180-degree peel strength of the pressure-sensitive adhesive film is not less than 0.05KN / m.

7. The method according to claim 5, characterized in that, in: The pressure-sensitive adhesive film roller (3) applies a force of not less than 2000N to make the pressure-sensitive adhesive film (300) adhere tightly to the upper surface of the strip brazing filler metal (200).

8. The method according to claim 5, characterized in that, in: The peel strength of the lower silicone release paper (102) is 0.03N / 25mm to 0.15N / 25mm, and the peel strength of the upper silicone release paper (101) is 0.25N / 25mm to 0.40N / 25mm.

9. The method according to claim 5, characterized in that, in: The unwinding tension of the strip unwinding roller (1), the pressure-sensitive adhesive unwinding roller (5), and the polyethylene film unwinding roller (6) is between 0.05N and 0.25N.

10. The method according to any one of claims 5-9, characterized in that, in: The thickness of the polyethylene film (400) is between 0.08 mm and 0.15 mm.

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