A glue supply system for automobile window film coating

Abstract

The utility model belongs to film coating technical field discloses a kind of glue supply systems for automobile window film coating, including glue supply line and the anti-pulse component being arranged on the glue supply line;The glue supply line includes upstream pipe, downstream pipe and at least two shunt pipes connected between the two;The anti-pulse component includes: first pulse damper, is set on the upstream pipe, for the primary pulsation attenuation of inflow coating;At least two shunt filters, each the shunt filter is set on one the shunt pipe, for the independent filtration of shunt coating;Second pulse damper, is set on the downstream pipe, for the secondary pulsation attenuation of filtered coating convergence;Wherein, the coating viscosity is not more than 400cps.Summarized above, through multistage buffering and parallel filtering steady flow, the stability of overall glue supply system feeding can be effectively ensured, and then the coating coating forming quality is improved.

Description

Technical Field

[0001] This utility model belongs to the field of thin film coating technology, specifically relating to an adhesive supply system for automotive window film coating. Background Technology

[0002] Automotive window film (also known as solar film or heat insulation film) is a functional film applied to the surface of automotive glass, primarily serving functions such as heat insulation, UV protection, explosion protection, and privacy protection. Currently, slot coating is one of the most commonly used precision coating technologies in automotive window film manufacturing; during the slot coating process, the flow stability of the adhesive supply system directly determines the quality of the coating.

[0003] Existing adhesive supply systems typically use gear pumps as the power source. Gear pumps have the advantage of good flow continuity, but when conveying low-viscosity fluids, the outlet flow rate is subject to periodic high-frequency pulsations due to factors such as gear meshing clearance and speed fluctuations. This causes the coating liquid pressure at the coating die head to fluctuate accordingly, resulting in periodic changes in coating thickness in the transverse direction, forming alternating light and dark horizontal lines, which seriously affects the appearance quality and optical performance of the product.

[0004] Existing automotive window film coatings are typically formulated by adding functional nanomaterials to oil-based acrylic resin adhesives. These coatings are characterized by low viscosity, the presence of nanoparticles, and thin coating thickness, making them extremely sensitive to flow fluctuations during the coating process.

[0005] In existing technologies, pulse dampers are typically installed at the pump outlet to suppress pulsation caused by gear pump delivery. However, for low-viscosity fluid coatings, which have low flow inertia and fast response speeds, a single damper often struggles to effectively absorb high-frequency pulsation energy, resulting in significant residual pulsation in the coating fluid. Furthermore, the aforementioned coatings inevitably contain nanoparticles, which can easily clog the coating die, thereby affecting production continuity. Utility Model Content

[0006] In view of this, in order to solve the problems mentioned in the background art, the purpose of this utility model is to provide an adhesive supply system for automotive window film coating.

[0007] To achieve the above objectives, this utility model provides the following technical solution: an adhesive supply system for automotive window film coating, comprising an adhesive supply pipeline and an anti-pulse component disposed on the adhesive supply pipeline; the adhesive supply pipeline includes an upstream pipe, a downstream pipe, and at least two branch pipes connected in parallel between the two; the anti-pulse component includes: a first pulse damper disposed on the upstream pipe for primary pulsation attenuation of the incoming coating; at least two branch filters, each branch filter being disposed on one of the branch pipes respectively, for independent filtration of the split coating; and a second pulse damper disposed on the downstream pipe for secondary pulsation attenuation of the filtered and converging coating; wherein the viscosity of the coating does not exceed 400 cps.

[0008] Preferably, the diversion filter uses a pleated PP filter element or a PES filter element.

[0009] Preferably, both the first pulse damper and the second pulse damper are airbag-type or diaphragm-type pulse dampers, and the pre-charge pressure inside the pulse damper is 50% to 80% of the adhesive supply working pressure.

[0010] Preferably, both the first pulse damper and the second pulse damper are equipped with an exhaust valve and a pressure gauge; the exhaust valve is used to adjust the pre-charge pressure, and the pressure gauge is used to monitor the pre-charge pressure.

[0011] Preferably, the glue supply system further includes a glue supply pump for pumping paint into the glue supply pipeline; the glue supply pump is located on the upstream pipe upstream of the first pulse damper, and the pipeline length between the glue supply pump and the first pulse damper does not exceed 1m.

[0012] Preferably, the single-cycle displacement of the glue supply pump does not exceed 40cc; the volume of the first pulse damper is 10 to 30 times the single-cycle displacement of the glue supply pump; and the volume of the second pulse damper is 8 to 20 times the single-cycle displacement of the glue supply pump.

[0013] Preferably, the glue supply system further includes a distributor and a manifold; the distributor connects the upstream pipe to the at least two distributor pipes; the manifold connects the at least two distributor pipes to the downstream pipe.

[0014] Preferably, the glue supply system further includes a glue applicator head for outputting the paint in the glue supply pipeline to the surface of the substrate; the glue applicator head is disposed on the downstream pipe downstream of the second pulse damper, and the pipeline length between the glue applicator head and the second pulse damper does not exceed 0.5m.

[0015] Preferably, the glue supply system further includes a pressure monitoring component for real-time monitoring of the glue supply pressure in the glue supply pipeline; the pressure monitoring component includes multiple pressure sensors respectively disposed at the inlet of the first pulse damper, the inlet of the shunt filter, and the outlet of the second pulse damper.

[0016] Preferably, the glue supply system further includes a glue supply tank, the glue outlet of which is connected to the upstream glue inlet of the glue supply pipeline.

[0017] Compared with the prior art, this utility model has the following advantages:

[0018] (1) This utility model provides an adhesive supply system for automotive window film coating, including an anti-pulse component formed by a first pulse damper, at least two diversion filters, and a second pulse damper; the first pulse damper performs primary pulsation attenuation on the inflowing coating in the upstream pipe, thereby effectively reducing the flow peak; the diversion filters independently filter the diverted coating in the corresponding diversion pipe, and while filtering out impurities, utilize the low flow resistance characteristics of the parallel structure to achieve balanced and stable coating flow; the second pulse damper performs secondary pulsation attenuation on the confluenced coating in the downstream pipe, eliminating residual pulsation; thereby effectively ensuring the stability of the overall adhesive supply system and improving the coating forming quality;

[0019] (2) In this utility model, for low viscosity coatings, by limiting the displacement of the glue supply pump and the volume of the damper, the damper has sufficient air chamber volume change to absorb the high frequency pulsation generated by the small capacity pump. In addition, the pipeline length between the glue supply pump, the damper and the glue application head is limited, thereby reducing the pipeline cavity effect and further improving the pulsation attenuation effect. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model; in the figure: first pulse damper-1; diverter filter-2; second pulse damper-3; glue supply pump-4; diverter-5; manifold-6; glue applicator head-7; exhaust valve-8; pressure gauge-9; glue supply tank-10; pressure sensor-11. Detailed Implementation

[0021] To further understand the content of this utility model, a detailed description of it is provided in conjunction with the accompanying drawings and embodiments. The structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art; they are not intended to limit the implementation conditions of this utility model and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effects and objectives of this utility model, should still fall within the scope of the technical content disclosed in this utility model. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of implementation. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of implementation of this utility model. It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so as to the embodiments of this application described herein.

[0022] like Figure 1 As shown, the present invention provides an adhesive supply system for automotive window film coating, including an adhesive supply pipeline, a pressure monitoring component for real-time monitoring of the adhesive supply pressure in the adhesive supply pipeline, and an adhesive supply tank 10, an adhesive supply pump 4, an anti-pulse component, and an adhesive application head 7 arranged sequentially along the supply direction of the adhesive supply pipeline.

[0023] For example, the adhesive supply line includes an upstream pipe, a downstream pipe, and at least two branch pipes connected in parallel between them. Specifically, the upstream pipe and the at least two branch pipes are connected by a distributor 5 to distribute the paint in the upstream pipe evenly into the at least two branch pipes; the at least two branch pipes and the downstream pipe are connected by a manifold 6 to achieve effective convergence of the paint in the at least two branch pipes.

[0024] Furthermore, the inlet end of the upstream pipe is connected to the outlet end of the glue supply tank 10; the glue supply pump 4 is installed on the upstream pipe and is used to pump the paint stored in the glue supply tank 10 downstream of the glue supply pipeline; the anti-pulse component is used to absorb the high-frequency pulsation energy of the paint in the glue supply pipeline during the transportation process to ensure stable delivery of the paint; the coating head 7 is connected to the outlet end of the downstream pipe and is used to output the paint in the glue supply pipeline and coat it onto the surface of the substrate.

[0025] It should also be noted that the adhesive supply system of this application is specifically used to deliver coatings containing functional nanomaterials. The coating is specifically an oil-based acrylic resin adhesive with added cesium tungsten oxide (functional nanomaterial) heat insulation slurry, and its viscosity does not exceed 400 cps.

[0026] In one specific embodiment, the glue supply pump 4 is preferably a gear pump, and the single-rotation displacement of the glue supply pump 4 does not exceed 40cc, and the rated speed range is 100 to 500 rpm.

[0027] In one specific embodiment, the anti-pulse assembly includes a first pulse damper 1, at least two shunt filters 2, and a second pulse damper 3.

[0028] The first pulse damper 1 is installed on the upstream pipe and located downstream of the glue supply pump 4, and is used to perform primary pulsation attenuation on the incoming paint. Specifically, the first pulse damper 1 is an airbag-type or diaphragm-type pulse damper, and its volume is 10 to 30 times the single-turn displacement of the glue supply pump 4; the housing is made of stainless steel, and the airbag or diaphragm is made of fluororubber. In actual operation, nitrogen is pre-charged into the first pulse damper 1 so that the pre-charge pressure inside the first pulse damper 1 is 60% of the glue supply working pressure, and the pre-charge pressure is regulated and monitored by the exhaust valve 8 and pressure gauge 9 installed on the top of the first pulse damper 1. When paint is input into the upstream pipe, the first pulse damper 1 utilizes the compressibility of its internal air chamber to store a portion of the paint during the peak flow stage, thereby reducing the peak flow, and releases the stored paint during the trough flow stage to replenish the trough flow, thereby achieving primary pulsation attenuation of the incoming paint.

[0029] Each of the diversion filters 2 is installed on one of the diversion pipes to independently filter the diverted paint. Specifically, each diversion filter 2 uses a pleated PP or PES filter element with a filtration accuracy of 5μm and an effective filtration area of ​​approximately greater than 0.5m². 2 The maximum operating pressure difference is 0.2 MPa. Taking the setup of two diversion pipes and diversion filter 2 as an example: when the paint passes through the diverter 5, it is evenly divided into two parts and flows to the two diversion pipes respectively. The two diversion filters 2 are installed in parallel through the two diversion pipes, so that each diversion filter 2 can independently filter the paint in its corresponding diversion pipe. During the process, the filtration accuracy of 5 μm can effectively intercept particulate impurities in the paint, thus effectively avoiding clogging of the applicator head 7. In addition, since the pleated filter element has a certain cavity and flow resistance, it can further rectify the flow fluctuation. Combined with the low flow resistance characteristics of the parallel structure of the two diversion filters 2, the dual effects of filtration and flow stabilization are achieved.

[0030] It should be noted that PP (polypropylene) material has excellent acid and alkali resistance and chemical stability, making it suitable for most water-based and oil-based coatings; PES (polyethersulfone) material has lower protein adsorption, making it suitable for optical film coating applications with high cleanliness requirements. Those skilled in the art can choose flexibly according to actual working conditions, as long as the filtration accuracy and area requirements are met.

[0031] The second pulse damper 3 is installed on the downstream pipe and located upstream of the dispensing head 7, used to perform secondary pulsation attenuation on the filtered and converging paint. Specifically, the second pulse damper 3 is an airbag or diaphragm type pulse damper, and its volume is 8 to 20 times the single-turn displacement of the dispensing pump 4; the housing is made of stainless steel, and the airbag or diaphragm is made of fluororubber. In actual operation, nitrogen is pre-charged into the second pulse damper 3 so that the pre-charge pressure inside the second pulse damper 3 is 50% of the dispensing working pressure, and the pre-charge pressure is regulated and monitored by the exhaust valve 8 and pressure gauge 9 installed on the top of the second pulse damper 3. When the diverted and filtered paint enters the downstream pipe through the converging device 6, the second pulse damper 3 performs secondary pulsation attenuation on the incoming paint based on the same principle as the first pulse damper 1.

[0032] It should be noted that the pipeline length between the glue supply pump 4 and the first pulse damper 1 does not exceed 1m; the pipeline length between the glue application head 7 and the second pulse damper 3 does not exceed 0.5m. This effectively reduces the pipeline cavity effect, thereby improving the damper's pulsation attenuation effect and the uniformity of the coating.

[0033] In addition, the pressure monitoring component includes multiple pressure sensors 11 respectively installed at the inlet of the first pulse damper 1, the inlet of the diversion filter 2, and the outlet of the second pulse damper 3. Specifically, the pressure sensor installed at the inlet of the first pulse damper 1 is used to monitor the outlet pressure fluctuation of the glue supply pump 4. If the pressure fluctuation exceeds a preset threshold, it indicates that the glue supply pump 4 may be worn or have unstable speed. The pressure sensors installed at the inlet of the diversion filter 2 and the inlet of the first pulse damper 1 work together to calculate the pressure difference between the two and determine the degree of blockage of the filter element of the diversion filter 2 in real time. When the filtration pressure difference of the diversion filter 2 exceeds 0.15 MPa, the filter element should be replaced. The pressure sensor installed at the outlet of the second pulse damper 3 directly reflects the stability of the fluid pressure entering the glue application head 7. If abnormal pressure fluctuation occurs at this point, it indicates that the second pulse damper 3 is faulty.

[0034] In summary, under the same coating process parameters, the following three glue supply configurations were tested respectively: Coating process parameters: coating viscosity 300cps, coating speed 10m / min, wet film thickness 20μm; Configuration A (comparative example): glue supply pump directly connected to glue applicator, without pulse damper and filter; Configuration B (comparative example): glue supply pump, one pulse damper, one filter (same as shunt filter 2) and glue applicator are sequentially installed on the glue supply line; Configuration C (this application): glue supply pump, anti-pulse assembly and glue applicator are sequentially installed on the glue supply line, the anti-pulse assembly includes a first pulse damper, at least two shunt filters and a second pulse damper.

[0035] The test results are shown in the table below:

[0036]

[0037] As shown in the table above, configuration C significantly improves upon configurations B and A in terms of pulsation suppression, coating uniformity, filtration effect, and yield. Particularly for low-viscosity coatings, configuration B still exhibits some residual pulsation, resulting in slight horizontal lines, while configuration C controls the pulsation to within ±1%, further eliminating visible horizontal line defects.

[0038] It should be understood that although this utility model is optimized for automotive window film coating, its technical solution is also applicable to other precision coating fields that use small-capacity gear pumps to deliver low-viscosity coatings, such as optical film coating, lithium battery separator coating, tape and protective film coating, flexible circuit board cover film coating, and other wet coating processes with high requirements for coating uniformity. As long as the coating system suffers from horizontal streaks caused by pulsation of the glue pump, and the coating viscosity is in the range of 50–500 cps, the technical solution of this utility model can be used for improvement.

[0039] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. 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.

[0040] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. An adhesive supply system for automotive window film coating, characterized in that, The system includes a glue supply pipeline and an anti-pulse assembly installed on the glue supply pipeline. The glue supply pipeline includes an upstream pipe, a downstream pipe, and at least two shunt pipes connected in parallel between them. The anti-pulse assembly includes: a first pulse damper (1) installed on the upstream pipe for primary pulsation attenuation of the incoming paint; at least two shunt filters (2), each shunt filter (2) being installed on one of the shunt pipes for independent filtration of the shunted paint; a second pulse damper (3) installed on the downstream pipe for secondary pulsation attenuation of the filtered and merged paint. The paint viscosity does not exceed 400 cps. The shunt filters (2) are pleated filter elements. The system also includes a shunt (5) and a merger (6). The shunt (5) connects the upstream pipe to the at least two shunt pipes. The merger (6) connects the at least two shunt pipes to the downstream pipe.

2. The adhesive supply system for automotive window film coating according to claim 1, characterized in that: The diversion filter (2) adopts a pleated PP filter element or a PES filter element.

3. The adhesive supply system for automotive window film coating according to claim 1, characterized in that: Both the first pulse damper (1) and the second pulse damper (3) are airbag type or diaphragm type pulse dampers, and the pre-charge pressure inside the pulse damper is 50% to 80% of the glue supply working pressure.

4. The adhesive supply system for automotive window film coating according to claim 3, characterized in that: Both the first pulse damper (1) and the second pulse damper (3) are equipped with an exhaust valve (8) and a pressure gauge (9); the exhaust valve (8) is used to adjust the pre-charge pressure, and the pressure gauge (9) is used to monitor the pre-charge pressure.

5. The adhesive supply system for automotive window film coating according to claim 1, characterized in that: It also includes a glue supply pump (4) for pumping paint into the glue supply pipeline; the glue supply pump (4) is located on the upstream pipe upstream of the first pulse damper (1), and the pipeline length between the glue supply pump (4) and the first pulse damper (1) does not exceed 1m.

6. The adhesive supply system for automotive window film coating according to claim 5, characterized in that: The single-cycle displacement of the glue supply pump (4) does not exceed 40cc; the volume of the first pulse damper (1) is 10 to 30 times the single-cycle displacement of the glue supply pump (4); and the volume of the second pulse damper (3) is 8 to 20 times the single-cycle displacement of the glue supply pump (4).

7. The adhesive supply system for automotive window film coating according to claim 1, characterized in that: It also includes a glue applicator (7) for applying the coating material in the glue supply line to the surface of the substrate; the glue applicator (7) is located on the downstream pipe downstream of the second pulse damper (3), and the length of the pipeline between the glue applicator (7) and the second pulse damper (3) does not exceed 0.5m.

8. The adhesive supply system for automotive window film coating according to claim 1, characterized in that: It also includes a pressure monitoring component for real-time monitoring of the glue supply pressure in the glue supply pipeline; the pressure monitoring component includes multiple pressure sensors (11) respectively installed at the inlet of the first pulse damper (1), the inlet of the diversion filter (2), and the outlet of the second pulse damper (3).

9. The adhesive supply system for automotive window film coating according to claim 1, characterized in that: It also includes a glue supply tank (10), whose glue outlet is connected to the upstream glue inlet end of the glue supply pipeline.

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