A coating edge laser engraving method for a film-coated glass

Abstract

The application discloses a kind of coating edge laser engraving methods of film glass, belong to glass processing technical field.The scheme uses laser to remove the coating of glass product surface edge excess, according to the total thickness of film material and adhesive layer, the maximum coating thickness when film is bubble-free, the maximum coating thickness when light leaks, the minimum step width when film is bubble-free;According to the thickness range of coating, the maximum coating thickness when film is bubble-free, the maximum coating thickness when light leaks, the minimum step width when film is bubble-free, determine the step number, remove layer, each layer removal height, each layer removal width;Adjust laser power, determine the laser power parameter closest to the each layer removal height, create the corresponding laser engraving file of each layer;According to from top to bottom order, in turn, each layer engraving is carried out, and step structure is formed.The application solves the problem that coating edge is not neat, gradient is big, hand is scraped, is easily damaged in transfer, and film produces bubble.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of glass processing, in particular to a coating edge laser engraving method for a film-coated glass. BACKGROUND

[0002] In the prior art, a coating is often made on the edge area of the surface of optical glass, and then a functional film is attached on the entire glass surface. The coating is usually black ink plated on the edge of the glass surface by silk-screen printing. The ink edge is not neat, the gradient is large, and the "scratch hand" process problem often occurs. The ink is easily damaged during transportation, and bubbles are easily generated when the film is attached on the ink.

[0003] In the prior art, a coating is often made on the edge area of the surface of optical glass, and then a functional film is attached on the entire glass surface. The coating is usually black ink plated on the edge of the glass surface by silk-screen printing. However, the existing coating has the following problems:

[0004] 1. Ink edge is not neat: the ink edge obtained by silk-screen printing is not neat enough, resulting in poor visual effect.

[0005] 2. Large gradient of ink edge: the transition of the ink edge is not smooth enough, forming a large gradient, affecting the overall appearance.

[0006] 3. "Scratch hand" problem: the ink edge is prone to "scratch hand" phenomenon, affecting the hand feeling and use experience.

[0007] 4. Easy to be damaged during transportation: the ink edge is easily damaged during transportation and handling, resulting in coating damage.

[0008] 5. Bubbles generated when attaching film: when attaching a functional film on the ink, bubbles are easily generated, affecting the film quality and product reliability.

[0009] Coatings of other materials in addition to ink usually also have similar problems.

[0010] In order to solve the above problems and improve the neatness, appearance and film quality of the coating, it is necessary to modify the existing coating. SUMMARY

[0011] The technical problem to be solved by the present application is to provide a coating edge laser engraving for a film-coated glass for modifying the edge of the coating on the surface of the film-coated glass, aiming at the above defects of the prior art.

[0012] To achieve the above purpose, the present application provides a coating edge laser engraving method for a film-coated glass, which engraves a stepped structure on the edge of the coating on the surface of the glass product to facilitate the subsequent attachment of a film material on the surface of the glass product through an adhesive layer. The method comprises the following steps:

[0013] Step S1, using laser to remove the excess coating on the surface edge of the glass product, to get neat coating frame;

[0014] Step S2, measure the total thickness of the film and adhesive layer Ha1, the thickness of the adhesive layer Ha2, the thickness range of the coating [Hb1, Hb2] after the film is pasted, wherein Hb1 is the minimum thickness value of the coating, and Hb2 is the maximum thickness value of the coating;

[0015] Step S3, according to the total thickness of the film and adhesive layer Ha1, the thickness range of the coating [Hb1, Hb2], determine the maximum coating thickness Hb3 when the film is pasted without bubbles and the maximum coating thickness Hb4 when the light leaks through the film by experiment; according to the maximum coating thickness Hb3 when the film is pasted without bubbles, determine the minimum step width Lc1 when the film is pasted without bubbles by experiment;

[0016] Step S4, according to the thickness range of the coating [Hb1, Hb2], the maximum coating thickness Hb3 when the film is pasted without bubbles, and the maximum coating thickness Hb4 when the light leaks through the film, determine the step number Nc, the number of layers Nd to be removed, and the height of each layer to be removed {Hc}; the number of layers Nd to be removed = step number Nc-1; if the same step number Nc and the height of each layer to be removed {Hc} are determined for all glass products; if firstly, the glass products are grouped according to the thickness of the coating, and then different step numbers Nc and the height of each layer to be removed {Hc} are determined for the glass products in different groups;

[0017] Step S5, according to the number of layers Nd to be removed and the minimum step width Lc1 when the film is pasted without bubbles, determine the width of each layer to be removed;

[0018] Step S6, adjust the laser power to determine the laser power parameter closest to the height of each layer to be removed {Hc}; according to the laser power, determine the actual cutting height of each layer; according to the number of layers Nd to be removed, the actual height of each layer to be removed, and the width of each layer to be removed, create a laser engraving file corresponding to each layer;

[0019] Step S7, according to the laser engraving file corresponding to each layer and the laser power parameter, sequentially engrave each layer in order from top to bottom to form a step structure.

[0020] Preferably, in step S3, the method for determining the maximum coating thickness Hb3 when the film is pasted without bubbles and the maximum coating thickness Hb4 when the light leaks through the film by experiment is:

[0021] The glass product with a coating thickness of Hb is subjected to laser engraving to form a step on each glass product, the step covers different height ranges, the step width Lc2>Ha1+Hb2, the film pasting effect of different height steps and the light leakage effect after film pasting are compared to determine the maximum coating thickness Hb3 when the film is bubble-free and the maximum coating thickness Hb4 when there is light leakage; wherein: Ha1 is the total thickness of the film material and the adhesive layer, Hb1 is the minimum thickness value of the coating, Hb2 is the maximum thickness value of the coating, and Hb1≤Hb≤Hb2.

[0022] Preferably, the step width Lc2>5*(Ha1+Hb2), wherein Ha1 is the total thickness of the film material and the adhesive layer, and Hb2 is the maximum thickness value of the coating.

[0023] Preferably, in step S3, the method for determining the minimum step width Lc1 when the film is bubble-free through experiments is:

[0024] The glass product is subjected to laser engraving to form a step on each glass product, the height of the step is less than the coating thickness Hb3 when the film is bubble-free, and the step width Lc3 covers different width values, the film pasting effect of different width steps is compared to determine the minimum step width Lc1 when the film is bubble-free.

[0025] Preferably, the method for covering different width values of the step width Lc3 is: taking the thickness Ha2 of the adhesive layer as a reference, and obtaining different widths Lc3 of the step by making a gradient in the upward and downward directions.

[0026] Preferably, in step S4, the if The method for determining the same step number Nc and the removal height {Hc} of each layer for all glass products is:

[0027] Step number or step number Hb4<Hc<Hb3, after removal, the height of the last step from top to bottom is >Hb4, wherein Hb3 is the maximum coating thickness when the film is bubble-free, and Hb4 is the maximum coating thickness when there is light leakage.

[0028] Preferably, when the number of removal layers Nd is greater than 1, the removal amount Hc of each layer is the same.

[0029] Preferably, in step S4, the if The method for determining different step numbers Nc and removal heights {Hc} of each layer for different groups of glass products according to the coating thickness is:

[0030] The The same glass products are divided into a group, wherein Hbm is the thickness of any glass product;

[0031] The number of steps Nc and the height of each layer of removal {Hc} are determined for each group of glass products.

[0032] Preferably, in the step S5, the method for determining the width of each layer of removal according to the number of removal layers Nd and the minimum step width Lc1 when the film is free of bubbles is:

[0033] The width of the lowest removal layer is greater than the minimum step width Lc1 when the film is free of bubbles, and the width difference between adjacent removal layers from bottom to top is greater than the minimum step width Lc1 when the film is free of bubbles.

[0034] Preferably, before the step S1, the method further comprises:

[0035] According to the transmittance of different lasers on the glass product, a laser that causes less damage to the strength of the glass product is selected.

[0036] The present application has the following beneficial effects: the present application uses laser to remove the excess coating on the surface edge of the glass product, and obtains a neat coating frame; according to the total thickness of the film material and the adhesive layer and the thickness range of the coating, the maximum coating thickness when the film is free of bubbles and the maximum coating thickness when light leaks are determined through experiments; according to the maximum coating thickness when the film is free of bubbles, the minimum step width when the film is free of bubbles is determined through experiments; according to the thickness range of the coating, the maximum coating thickness when the film is free of bubbles and the maximum coating thickness when light leaks, the number of steps, the number of removal layers and the height of each layer of removal are determined; according to the number of removal layers and the minimum step width when the film is free of bubbles, the width of each layer of removal is determined; the laser power is adjusted to determine the laser power parameter closest to the height of each layer of removal; according to the laser power, the actual cutting height of each layer is determined; according to the number of removal layers, the actual height of each layer of removal and the width of each layer of removal, the corresponding laser engraving file of each layer is created; according to the corresponding laser engraving file of each layer and the laser power parameter, the engraving of each layer is sequentially performed in order from top to bottom, and a step structure is formed. The scheme of the present application solves the problems of uneven coating edge, large gradient, scratching, easy damage during transfer, and bubble generation during film sticking, improves the neatness and aesthetics of the coating, and the quality of the film, and is low in cost and high in practicability. BRIEF DESCRIPTION OF DRAWINGS

[0037] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application. The illustrative embodiments of the present application and their descriptions serve to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0038] Figure 1 The method for laser engraving of the coating edge of the film-coated glass provided by the embodiments of the present application is shown in the schematic diagram.

[0039] Figure 2A glass product structure schematic diagram provided by the embodiment of the present application.

[0040] Figure 3 An experimental principle diagram for finding the maximum coating thickness when there is no bubble in the film and the maximum coating thickness when there is light leakage provided by the embodiment of the present application.

[0041] Figure 4 A first laser engraving method schematic diagram provided by the embodiment of the present application.

[0042] Figure 5 A second laser engraving method schematic diagram provided by the embodiment of the present application.

[0043] Figure 6 A third laser engraving method schematic diagram provided by the embodiment of the present application.

[0044] Figure 7 A final scheme schematic diagram of laser engraving provided by the embodiment of the present application. DETAILED DESCRIPTION

[0045] To make the purpose, technical scheme and advantages of the embodiment of the present application clearer, the technical scheme in the embodiment of the present application will be described clearly and completely below in combination with the drawings in the embodiment of the present application. Obviously, the described embodiment is a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0046] The scheme of the present application is suitable for trimming the edge of the coating layer with a non-smooth edge on the surface of a glass product, making the coating layer edge smoother, and not generating bubbles when the film is attached on the glass product subsequently. The glass product described in the present application is an optical glass product in the fields of VR glasses panels, cameras, tablet computers, mobile phones, etc. in the electronic field and the fields of aerospace, aviation and automobile.

[0047] The embodiments of the present application will be described in further detail below in combination with the drawings of the specification. It should be understood that the embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application.

[0048] As shown in Figure 1 The embodiment of the present application provides a laser engraving method for the coating layer edge of a film-attached glass, which engraves a stepped structure on the coating layer edge of the surface of a glass product to facilitate the subsequent attachment of a film material on the surface of the glass product through an adhesive layer. The method comprises the following steps:

[0049] Step S1, using a laser to remove the excess coating layer on the edge of the surface of the glass product to obtain a neat coating layer frame.

[0050] In the embodiment of the present application, the coating is ink printed on the edge of the glass product, the width of the printed coating is usually larger than the actual required width, and the edge of the coating is uneven, therefore, the excess coating needs to be removed by using laser to obtain a coating with neat frame. As shown in Figure 2 Fig. 1 is a schematic diagram of the product structure of the embodiment of the present application, the glass product is a mobile phone screen, and black ink is printed on the periphery of the screen, the excess ink on the periphery is removed to obtain a neat ink layer frame, and the effect is as shown in Figure 2 Fig. 2.

[0051] In the embodiment of the present application, the power, speed and frequency of the laser are adjusted according to experience to remove the coating completely. The adjustment method of each parameter is a conventional adjustment method, which will not be described here.

[0052] In the embodiment of the present application, before the step S1, the method further comprises:

[0053] According to the transmittance of different lasers to the glass product, a laser with the least damage to the strength of the glass product is selected. After the edge of the coating is processed, the strength of the glass product can be slightly reduced, but still needs to meet the standard. Therefore, when the laser is used to engrave the edge of the coating, a laser with the least damage to the glass needs to be selected.

[0054] In step S2, the total thickness Ha1 of the film material and the adhesive layer, the thickness Ha2 of the adhesive layer and the thickness range [Hb1, Hb2] of the coating on the surface of the glass product after the film is attached are measured, wherein Hb1 is the minimum thickness value of the coating, and Hb2 is the maximum thickness value of the coating.

[0055] The film material is stretched to a certain extent during the attachment process, and the thickness of the film material after the film is attached is smaller than that before the film is attached. Therefore, the total thickness Ha1 of the film material and the adhesive layer and the thickness Ha2 of the adhesive layer are measured after the film material is attached to the surface of the glass product. The total thickness Ha1 of the film material and the adhesive layer and the thickness Ha2 of the adhesive layer will be used to determine the maximum coating thickness Hb3 when the film is attached without air bubbles, the maximum coating thickness Hb4 when light leakage occurs, and the minimum step width Lc1 when the film is attached without air bubbles.

[0056] The measurement method of the total thickness Ha1 of the film material and the adhesive layer and the thickness Ha2 of the adhesive layer is not particularly limited in the embodiment of the present application. In actual application, the film material can be attached to the glass product, and then cross-cutting is performed in the middle of the film material, and the thickness of the film material and the adhesive layer is measured through the cut. The film material production and film attachment process will introduce tolerances, therefore, the total thickness Ha1 of the film material and the adhesive layer and the thickness Ha2 of the adhesive layer are the average values of multiple groups of measurement data.

[0057] The embodiment of the present application does not have special restrictions on the measuring method of the coating thickness. In some embodiments of the present application, the coating thickness is tested by a high-precision electronic tester. Due to production process reasons or different product requirements, the coating thickness on the glass product can be different, and therefore, in actual application, as many glass samples as possible are taken for testing to obtain the thickness range and thickness distribution information of the coating.

[0058] In step S3, the maximum coating thickness Hb3 when the film is bubble-free and the maximum coating thickness Hb4 when light leaks are determined by experiment according to the total thickness Ha1 of the film material and the adhesive layer and the thickness range [Hb1, Hb2] of the coating, and the minimum step width Lc1 when the film is bubble-free is determined according to the maximum coating thickness Hb3 when the film is bubble-free.

[0059] In the embodiment of the present application, the method for determining the maximum coating thickness Hb3 when the film is bubble-free and the maximum coating thickness Hb4 when light leaks in step S3 is as follows:

[0060] The glass product with a coating thickness of Hb is subjected to laser engraving to form a step on each glass product, the step covers different height ranges, and the step width Lc2>Ha1+Hb2. The film effect and the light leakage effect after film pasting of different height steps are compared to determine the maximum coating thickness Hb3 when the film is bubble-free and the maximum coating thickness Hb4 when light leaks. Wherein: Hb1≤Hb≤Hb2, Hb is a value with a larger thickness distribution ratio. The reason for setting the step width Lc2 to a larger value is to avoid the generation of bubbles during film pasting due to too small width. The embodiment of the present application does not have special restrictions on the specific value of the step width Lc2, as long as it is greater than the empirical value. In some embodiments of the present application, the step width Lc2>5*(Ha1+Hb2), and in order to improve efficiency, Lc2 is slightly greater than 5*(Ha1+Hb2), for example, 10%, 15%, or 20% more than 5*(Ha1+Hb2).

[0061] In the embodiment of the present application, the method for determining the minimum step width Lc1 when the film is bubble-free in step S3 is as follows:

[0062] The glass product is subjected to laser engraving to form a step on each glass product, the height of the step is less than the coating thickness Hb3 when the film is bubble-free, and the step width Lc3 covers different width values. The film effect of different width steps is compared to determine the minimum step width Lc1 when the film is bubble-free.

[0063] In the embodiment of the present application, in order to improve the verification efficiency, the method for covering different width values of the step width Lc3 is as follows: taking the thickness Ha2 of the adhesive layer as a reference, different widths Lc3 of the step are obtained by making a gradient in the upward and downward directions.

[0064] Step S4, according to the thickness range of the coating layer [Hb1, Hb2], the maximum coating thickness Hb3 when the film is bubble-free, and the maximum coating thickness Hb4 when light leaks, determine the number of steps Nc, the number of layers to be removed Nd, and the height of each layer to be removed {Hc}; the number of layers to be removed Nd = the number of steps Nc-1; if The same number of steps Nc and the height of each layer to be removed {Hc} are determined for all glass products; if First, group the glass products according to the thickness of the coating layer, and then determine different number of steps Nc and the height of each layer to be removed {Hc} for different groups of glass products.

[0065] In the embodiment of the application, in the step S4, the if The method for determining the same number of steps Nc and the height of each layer to be removed {Hc} for all glass products is:

[0066] The number of steps Or the number of steps Hb4 < Hc < Hb3, and the height of the last step from top to bottom after removal is > Hb4. In a specific implementation, the number of steps and the height of each layer to be removed need to be set to ensure that each step of the glass within the thickness range [Hb1, Hb2] of the coating layer can achieve the effect of no bubbles and no light leakage.

[0067] In the embodiment of the application, in order to improve the processing and verification efficiency, when the number of layers to be removed Nd is greater than 1, the removal amount Hc of each layer is the same.

[0068] In the embodiment of the application, in the step S4, the if According to the thickness of the coating layer, group the glass products, and determine different number of steps Nc and the height of each layer to be removed {Hc} for different groups of glass products.

[0069] The The same glass products are grouped, and Hbm is the thickness of any glass product;

[0070] Determine the number of steps Nc and the height of each layer to be removed {Hc} for the glass products in each group respectively.

[0071] Step S5, according to the number of layers to be removed Nd and the minimum step width Lc1 when the film is bubble-free, determine the removal width of each layer.

[0072] In the embodiment of the application, in the step S5, the method for determining the removal width of each layer according to the number of layers to be removed Nd and the minimum step width Lc1 when the film is bubble-free is:

[0073] The width of the lowermost removal layer is greater than the minimum step width Lc1 without bubbles when the film is attached, and the width difference of the adjacent removal layers from bottom to top is greater than the minimum step width Lc1 without bubbles when the film is attached.

[0074] Step S6, adjusting the laser power, determining the laser power parameter closest to the removal height {Hc} of each layer, determining the actual removal height of each layer according to the laser power; creating a corresponding laser engraving file of each layer according to the number of removal layers Nd, the actual removal height of each layer, and the removal width of each layer;

[0075] Step S7, according to the corresponding laser engraving file of each layer and the laser power parameter, sequentially performing laser engraving of each layer in the order from top to bottom to form a step structure.

[0076] The method provided by the embodiment can be applied to glass products of various thicknesses, and the steps are detailed and operable. By forming a micro-step structure at the edge of the coating layer through the method, the problems of unevenness, large gradient, scratching, easy damage during transfer, and bubbles generated during film attachment are solved, the uniformity and aesthetics of the coating layer are improved, the quality of the film is improved, the cost is low, and the practicability is strong.

[0077] The above method will be described in detail below with reference to a specific embodiment.

[0078] Embodiment 1

[0079] As shown in the figure, the glass product of the embodiment of the application has black ink silk-screened around the periphery, and the black ink needs to be trimmed to obtain a step-shaped structure as shown in the middle circle, and then a film is attached on the surface of the glass product. Figure 2 Figure 2

[0080] The specific steps of the laser engraving method for the coating layer edge of the film-attached glass of the embodiment are as follows:

[0081] Step S0, selecting a laser that causes less damage to the strength of the glass product according to the transmittance of different lasers to the glass product.

[0082] The transmittance of the glass product in the embodiment to the ultraviolet laser band of 355 nm is 91.5%, which is higher than the transmittance to the laser of other types of lasers, so in this embodiment, a nanosecond ultraviolet laser engraving device is selected as the laser.

[0083] Step S1, using a laser to remove the excess coating layer at the edge of the surface of the glass product to obtain a neat coating frame.

[0084] ​​In this embodiment, the coating width of the edge of the surface of the glass product is 2.2-2.5 mm, and the product needs to be modified to a coating width of 2±0.03 mm. In this embodiment, the speed is started at 500 mm / s and the frequency is 20 kHz, and then the power is determined, and then the intensity is verified, and then the intensity data is qualified by reducing the power and the speed, and then the frequency is changed to improve the effect. The final laser power used is 0.95 W, the speed is 350 mm / s, and the frequency is 30 kHz. In the subsequent steps, the speed and the frequency remain unchanged. Because the frequency of the laser fluctuates, in this embodiment, the laser power is determined as follows: record a data every 10 seconds within 1 minute, and take the average value as the power value.

[0085] In step S2, the total thickness Ha1 of the film material and the adhesive layer on the surface of the glass product after the film is pasted, the thickness Ha2 of the adhesive layer, and the thickness range [Hb1, Hb2] of the coating layer are measured, wherein Hb1 is the minimum thickness value of the coating layer, and Hb2 is the maximum thickness value of the coating layer.

[0086] In this embodiment, the composition of the film material is PMMA (Polymethyl methacrylate), and the composition of the adhesive layer is OCA (Optically Clear Adhesive). The glass product is pasted with the film material, and the film material thickness is measured by cross-cutting in the middle. It is verified that the thickness of the film material after pasting is about 80 um, and the thickness of the adhesive is about 10 um. A high-precision electronic tester is used, and 16 pieces of verified glass are randomly selected. The coating layer thickness is measured at 22 uniformly distributed points on the edge of the coating layer. After sorting the data, it is found that the coating thickness of the verification glass is in the range of 8-12 um.

[0087] In step S3, according to the total thickness Ha1 of the film material and the adhesive layer, and the thickness range [Hb1, Hb2] of the coating layer, the maximum coating thickness Hb3 when the film is pasted without air bubbles and the maximum coating thickness Hb4 when light leaks are determined by experiment; according to the maximum coating thickness Hb3 when the film is pasted without air bubbles, the minimum step width Lc1 when the film is pasted without air bubbles is determined by experiment.

[0088] In the embodiment of the application, the method for determining the maximum coating thickness Hb3 when the film is pasted without air bubbles and the maximum coating thickness Hb4 when light leaks by experiment is as follows:

[0089] As Figure 3As shown, the glass product with a coating thickness of 12 um is laser engraved, in order to avoid the problem of inaccurate positioning and the formation of a convex edge, the laser engraving file width is 0.55 mm, the laser is used to laser engrave the inner edge of the coating, the original speed and frequency are maintained, and the laser power is changed to 0.35 W, 0.4 W, …, 0.85 W, and the removal height is measured. The laser power with a removal height of about 7 um, 6 um, 5 um, 4 um, and 3 um is selected, and 5 glass products with a coating thickness of about 12 um are sent to the film, and whether there is a bubble is verified. The verification result shows that there is no bubble when the coating thickness is less than 6 um. Therefore, the maximum coating thickness Hb3 of the film without bubbles is 6 um. This embodiment does not deliberately do the light leakage verification, and for safety, the maximum coating thickness Hb4 of the light leakage is set to 1.5 um.

[0090] The glass product with a coating thickness of 8 um-9 um is selected, the film adhesive thickness is 10 um as a reference, and a file for removing is made Figure 3 The laser cutting step width is changed to 3, 5, 7, and 10 um, and the film is sent after removal to verify whether there is a bubble. The verification result shows that there is no bubble when the step width is greater than 5 um; in order to ensure that the product has no bubbles, a size slightly larger than the extreme value is generally selected, and the step width of 5.5 um is finally selected in the experiment. That is, the minimum step width Lc1 of the film without bubbles is 5.5 um.

[0091] Step S4, according to the thickness range [Hb1, Hb2] of the coating, the maximum coating thickness Hb3 of the film without bubbles, and the maximum coating thickness Hb4 of the light leakage, the step number Nc, the removal layer number Nd, and the removal height {Hc} of each layer are determined; the removal layer number Nd = step number Nc-1; if The same step number Nc and the removal height {Hc} of each layer are determined for all glass products; if The glass products are grouped according to the coating thickness, and different step numbers Nc and removal heights {Hc} of each layer are determined for different groups of glass products.

[0092] In this embodiment, Hb1 = 8 um and Hb2 = 12 um. The glass products do not need to be grouped.

[0093] If the step number is 2, only one removal can be performed, and the removal layer thickness is 6 mm. Considering the volatility of the laser, the film removal amount may be too large or too small, which may cause the problem of bubbles or light leakage after the film is pasted. If the step number is 4, the removal amount of each step is 2 um, and a longer processing time is required. Therefore, the step number is selected to be 3, the removal layer number is 2, and the removal amounts of the two layers are the same and slightly greater than 3 um, so as to ensure that the thickness of the lowermost step of the glass product with a coating thickness of 12 um is less than 6 um.

[0094] Step S5, according to the number of removed layers Nd and the minimum step width Lc1 when the film is attached without bubbles, the width of each layer is determined.

[0095] When the number of removed layers is 2, it means that two passes of laser are needed for twice removal. In practical application, there are three removal modes, as shown in Figures 4-6

[0096] Figure 4 In the embodiment, a gap or interference is easily generated between the first laser and the second laser after laser engraving, forming a groove or a protrusion; in addition, the formation of the third step is also affected by laser fluctuation.

[0097] Figure 5 In the embodiment, if the first laser removes the upper coating layer, a transition step is formed; the second laser removes the lower coating material, forming the first and second steps, so that the edge of the second step becomes an arc surface, compared with Figure 6 Compared with the first mode, the slope of the film material and the adhesive is slightly larger, the contact area is slightly smaller, the adhesion after thermoforming is relatively smaller, the rebound is larger, and bubbles are more likely to be generated.

[0098] Figure 6 In the embodiment, the first step is formed first, and then the second step is formed, so that the edge of the second step is not affected by the laser; the slope after the film is attached is smaller than Figure 5 The rebound force of the film material will be smaller, and the probability of generating bubbles is smaller.

[0099] Therefore, in the embodiment, the removal mode shown in Figure 6 is finally adopted, the first laser obtains the first step, and the second laser obtains the second step. Specifically, the number of removed layers Nd = 2, the minimum step width Lc1 when the film is attached without bubbles is 5.5 um, from bottom to top, the first layer removal width is 6 um, and the second layer removal width is 11.5 um.

[0100] Step S6, adjust the laser power, determine the laser power parameter closest to the height of each layer {Hc}, determine the actual cutting height of each layer according to the laser power; according to the number of removed layers Nd, the actual removal height of each layer, and the removal width of each layer, create a corresponding laser engraving file of each layer;

[0101] ​The power parameter of the laser is found to be about 0.48 W using a power meter. The coating is removed using this parameter, and the coating removal amount is measured to be 3.6 um. The power gradient parameter of the laser is recorded using a power meter, 0.48 W-0.35 W. The laser power gradient is 0.48 W, 0.47 W, 0.45 W, 0.42 W, 0.4 W, 0.37 W, and 0.35 W. The coating edge of the glass product surface is tested for removal of one layer using the above power. When the power is 0.42 W, the removal amount is 3.0 um, and when the power is 0.45 W, the removal amount is 3.3 um. A new piece of product is taken, and the edge coating is removed using powers of 0.42 W and 0.45 W. Similarly, 22 points are measured. The removal amount is 3-3.2 um when the power is 0.42 W, and the removal amount is 3.2-3.5 um when the power is 0.45 W. Because the third step of the 8 um thick coating has a remaining amount of 1-1.6 um when the power is 0.45 W, which is lower than the remaining amount of 1.6-2 um when the power is 0.42 W, strong light can penetrate more easily, and the power of 0.42 W is selected.

[0102] As shown in Figure 7 , it is a schematic diagram of the final scheme of laser engraving of the present embodiment. The first laser has a width of 11.5 um, and the second laser has a width of 6 um. The removal height of the first laser and the second laser is 3-3.2 um. After the two lasers are removed, the remaining amount of the coating is 1.6-6 um.

[0103] In step S7, according to the laser engraving file corresponding to each layer and the laser power parameter, the laser engraving of each layer is performed in turn from top to bottom to form a step structure.

[0104] As shown in Figure 7 , the first laser is used to perform laser engraving on the glass product to form the first step, and then the second laser is used to form the second step and the third step, that is, the expected three-layer step structure is obtained.

[0105] In the present embodiment, 8 pieces of glass products are taken and the coating edge is laser engraved in the above-mentioned manner. After the laser engraving is completed, the products are sent for film pasting and inspection. Finally, it is verified that there is no bubble in the coating edge of the glass.

[0106] In the present embodiment, the strength requirement of the glass product is 1340 N. In order to verify the change of the strength of the glass product before and after treatment, 8 pieces of glass products are taken in the present embodiment. The average value of the strength before coating treatment is 1820 N, and the average value of the strength after coating treatment is 1781 N, which decreases by 39 N on average. Therefore, although the strength of the glass product decreases after coating treatment, it is still qualified.

[0107] It should be noted that the embodiment of the present application takes black ink coating as an example to describe the edge laser engraving scheme of the coating. However, those skilled in the art should know that the scheme of the present application is also applicable to other coatings.

[0108] The present application has the following advantages: the present application uses laser to remove the excess coating on the edge of the surface of the glass product, and obtains a neat coating frame; according to the total thickness of the film material and the adhesive layer, and the thickness range of the coating, the maximum coating thickness when the film is bubble-free and the maximum coating thickness when light leaks are determined through experiments; according to the maximum coating thickness when the film is bubble-free, the minimum step width when the film is bubble-free is determined through experiments; according to the thickness range of the coating, the maximum coating thickness when the film is bubble-free, and the maximum coating thickness when light leaks, the number of steps, the number of removal layers, and the removal height of each layer are determined; according to the number of removal layers and the minimum step width when the film is bubble-free, the removal width of each layer is determined; the laser power is adjusted to determine the laser power parameter closest to the removal height of each layer; the actual cutting height of each layer is determined according to the laser power; according to the number of removal layers, the actual removal height of each layer, and the removal width of each layer, the corresponding laser engraving file of each layer is created; according to the corresponding laser engraving file of each layer and the laser power parameter, the laser engraving of each layer is performed in turn in the order from top to bottom, and a step structure is formed. The scheme of the present application solves the problems of uneven coating edge, large gradient, scratching, damage during transfer, and bubble generation during film pasting, and improves the neatness and aesthetics of the coating, and the quality of the film, and is low in cost and high in practicability.

[0109] The above is only a specific embodiment of the present application, which cannot limit the scope of the present application. Any equivalent changes made by those skilled in the art based on the present application, and changes well known to those skilled in the art, should still fall within the scope of the present application.

Claims

1. A method for laser engraving the edge of a film-coated glass coating, characterized in that, The method involves laser-engraving a stepped structure at the edge of the coating on the surface of the glass product to facilitate subsequent application of a film material to the glass product surface via an adhesive layer. The method includes the following steps: Step S1: Use a laser to remove excess coating from the edge of the glass product surface to obtain a neat coating border; Step S2: Measure the total thickness Ha1 of the film and adhesive layer, the thickness Ha2 of the adhesive layer, and the thickness range [Hb1, Hb2] of the coating on the surface of the glass product after the film is applied, where Hb1 is the minimum thickness value of the coating and Hb2 is the maximum thickness value of the coating. Step S3: Based on the total thickness Ha1 of the film material and adhesive layer and the thickness range of the coating [Hb1,Hb2], determine the maximum coating thickness Hb3 when there are no bubbles when the film is applied and the maximum coating thickness Hb4 when there is light leakage through experiments; based on the maximum coating thickness Hb3 when there are no bubbles when the film is applied, determine the minimum step width Lc1 when there are no bubbles when the film is applied through experiments. Step S4: Based on the coating thickness range [Hb1, Hb2], the maximum coating thickness Hb3 when there are no bubbles during film application, and the maximum coating thickness Hb4 when there is light leakage, determine the number of steps Nc, the number of layers to be removed Nd, and the removal height of each layer {Hc}; the number of layers to be removed Nd = the number of steps Nc - 1; if For all glass products, determine the same number of steps Nc and the same removal height {Hc} for each layer; if First, the glass products are grouped according to the coating thickness. Then, different step numbers Nc and layer removal heights {Hc} are determined for different groups of glass products. Step S5: Determine the removal width of each layer based on the number of layers Nd to be removed and the minimum step width Lc1 when there are no bubbles in the film. Step S6: Adjust the laser power to determine the laser power parameter that is closest to the removal height {Hc} of each layer; determine the actual removal height of each layer based on the laser power; create a laser engraving pattern file corresponding to each layer based on the number of layers Nd, the actual removal height of each layer, and the removal width of each layer. Step S7: Based on the laser engraving pattern corresponding to each layer and the laser power parameters, laser engraving is performed on each layer in order from top to bottom to form a stepped structure.

2. The laser engraving method for the coating edge of film-coated glass according to claim 1, characterized in that, In step S3, the method for experimentally determining the maximum coating thickness Hb3 when there are no bubbles in the film and the maximum coating thickness Hb4 when there is light leakage is as follows: Laser engraving is performed on glass products with a coating thickness of Hb to form a step on each glass product. The step covers different height ranges, and the step width Lc2 > Ha1 + Hb2. The film application effect and light leakage effect after film application are compared with the steps of different heights to determine the maximum coating thickness Hb3 when there are no bubbles and the maximum coating thickness Hb4 when there is light leakage. Wherein: Ha1 is the total thickness of the film material and adhesive layer, Hb1 is the minimum thickness value of the coating, Hb2 is the maximum thickness value of the coating, and Hb1 ≤ Hb ≤ Hb2.

3. The laser engraving method for the coating edge of film-coated glass according to claim 2, characterized in that, The step width Lc2 > 5*(Ha1+Hb2), where Ha1 is the total thickness of the film and adhesive layer, and Hb2 is the maximum thickness of the coating.

4. The laser engraving method for the coating edge of film-coated glass according to claim 1, characterized in that, In step S3, the method for experimentally determining the minimum step width Lc1 when the film is bubble-free is as follows: Laser engraving is performed on the glass products to form a step on each glass product. The height of the step is less than the coating thickness Hb3 when the film is bubble-free. The step width Lc3 covers different width values. The film application effect of different step widths is compared to determine the minimum step width Lc1 when the film is bubble-free.

5. The laser engraving method for the coating edge of film-coated glass according to claim 4, characterized in that, The method for covering different width values ​​of the step width Lc3 is as follows: taking the thickness Ha2 of the adhesive layer as a reference, different step widths Lc3 are obtained by making gradients in both the upward and downward directions.

6. The laser engraving method for the coating edge of film-coated glass according to claim 1, characterized in that, In step S4, if The method for determining the same number of steps Nc and the removal height {Hc} for each layer for all glass products is as follows: Number of steps or the number of steps Hb4 < Hc < Hb3. After removal, the height of the last step from top to bottom > Hb4, where Hb3 is the maximum coating thickness when there are no air bubbles in the film, and Hb4 is the maximum coating thickness when light leakage occurs.

7. The laser engraving method for the coating edge of film-coated glass according to claim 6, characterized in that, When the number of removal layers Nd is greater than 1, the removal amount Hc of each layer is the same.

8. The laser engraving method for the coating edge of film-coated glass according to claim 7, characterized in that, In step S4, if The method for grouping glass products according to coating thickness and determining different step numbers Nc and layer removal heights {Hc} for different groups of glass products is as follows: Will Identical glass products are grouped together, where Hbm represents the thickness of any glass product; For each group of glass products, determine the number of steps Nc and the removal height {Hc} of each layer.

9. The laser engraving method for the coating edge of film-coated glass according to claim 1, characterized in that, In step S5, the method for determining the removal width of each layer based on the number of layers Nd to be removed and the minimum step width Lc1 when there are no air bubbles in the film is as follows: The width of the bottom removal layer is greater than the minimum step width Lc1 when the film is applied without bubbles, and the width difference between adjacent removal layers from bottom to top is greater than the minimum step width Lc1 when the film is applied without bubbles.

10. The laser engraving method for the coating edge of film-coated glass according to claim 1, characterized in that, Before step S1, the method further includes: Choose a laser that causes less damage to the strength of the glass product based on the transmittance of different lasers to the glass product.

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