Process and system for preventing overflow plating of film layer

Abstract

The invention relates to a process and a system for preventing overflow coating of a film layer. The process comprises the following steps: shielding a shielding area on a product to be coated by using a water-soluble protector; fixing the water-soluble protector on the shielding area to obtain a shielded product to be coated; carrying out film coating on the shielded product to be subjected to film coating; and cleaning the water-soluble protectors on the shielding area to obtain a coated product. The method can simplify the technological process and reduce the cost, and is applied to the technical field of glass coating.

Description

Technical Field

[0001] The present invention relates to the technical field of glass coating, and particularly to a process and a system for preventing film layer overplating. Background Art

[0002] In the surface treatment of glass, it is often necessary to coat the surface of the glass. During the coating process, there are local areas that do not need to be coated, and certain methods need to be taken to shield these areas. Currently, the shielding methods mainly include physical shielding, local plasma removal, and printing of peelable glue.

[0003] The process flows of the above three coating methods are complex and the costs are relatively high. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a process and a system for preventing film layer overplating, which can simplify the process flow and reduce the cost.

[0005] On the one hand, the present invention provides a process for preventing film layer overplating, including the following steps:

[0006] Using a water-soluble protective substance to shield the shielding area on the product to be coated;

[0007] Fixing the water-soluble protective substance on the shielding area to obtain the product to be coated after shielding;

[0008] Coating the product to be coated after shielding;

[0009] Cleaning the water-soluble protective substance on the shielding area to obtain the coated product.

[0010] Optionally, the step of using a water-soluble protective substance to shield the shielding area on the product to be coated specifically includes:

[0011] Printing the water-soluble protective substance onto the shielding area of the product to be coated by means of screen printing or coating; the water-soluble protective substance includes water-soluble protective oil.

[0012] Optionally, the water-soluble protective oil includes 15%-25% of water-soluble resin, 1%-3% of additives, and 72%-84% of solvent.

[0013] Optionally, the water-soluble resin includes one of waterborne acrylic resin, water-soluble epoxy resin, water-soluble alkyd resin, polyvinyl alcohol, polyethylene oxide, or waterborne cellulose derivative.

[0014] Optionally, the additives include one or more of defoaming agent, thickening agent, or wetting agent.

[0015] Optionally, the solvent includes water and / or alcohol liquid.

[0016] Optionally, fixing the water-soluble protective material on the shielding area specifically includes:

[0017] Let the product to be coated stand still at a preset temperature for 20 to 60 minutes to cure the water-soluble protective material on the shielding area.

[0018] Optionally, cleaning the water-soluble protective material on the shielding area specifically includes:

[0019] At a temperature of 30°C - 50°C, use a chemical solution or water to clean the water-soluble protective material on the shielding area.

[0020] Optionally, the chemical solution includes glass water and / or a neutral cleaning agent.

[0021] On the other hand, the present invention provides a system for preventing film layer overplating, including a shielding device, a curing device, a coating device, and a cleaning device, wherein,

[0022] The shielding device is used to shield the shielding area on the product to be coated with a water-soluble protective material;

[0023] The curing device is used to fix the water-soluble protective material on the shielding area to obtain a shielded product to be coated;

[0024] The coating device is used to coat the shielded product to be coated;

[0025] The cleaning device is used to clean the water-soluble protective material on the shielding area to obtain a coated product.

[0026] Implementing the present invention has the following beneficial effects: This solution uses a water-soluble protective material to shield the area that does not need to be coated. During coating, the surface of the water-soluble protective material is dense and will not cause film layer overplating due to film layer penetration. After coating is completed, it can be directly put into water for cleaning, and the water-soluble protective material can be washed off. Compared with local plasma removal, the steps of using plasma to remove the film layer can be reduced, and the situation of incomplete plasma removal can be reduced. Compared with peelable glue, the steps of cleaning after sticking the glue and tearing off the peelable glue can be omitted, which can simplify the process flow and reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a process flow chart of a method for preventing film layer overplating provided by the present invention;

[0028] Figure 2 is an example diagram of a shielding area of a mobile phone glass provided by the present invention;

[0029] Figure 3 is a schematic diagram of a system for preventing film layer overplating provided by the present invention. Detailed Implementation Modes

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. For the step numbers in the following embodiments, they are only set for the convenience of elaboration and explanation, and no limitation is imposed on the order between steps. The execution order of each step in the embodiments can be adaptively adjusted according to the understanding of those skilled in the art.

[0031] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the embodiments of the present application. The singular forms "a", "said", and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0032] When the following description relates to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0033] In addition, in the description of the present application, unless otherwise specified, "and / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the front and back associated objects.

[0034] In some embodiments, as Figure 1-2 shown, Figure 1 is a process flow chart of preventing film layer overplating, Figure 2 is an example diagram of the shielding area of a mobile phone glass. In the figure, C represents the shielding area of the lens, and D represents the coating area. A process for preventing film layer overplating provided by the present invention includes the following steps:

[0035] S1. Use a water-soluble protective material to shield the shielding area on the product to be coated.

[0036] Among them, the product to be coated may be, but is not limited to, a glass plate, metal, or plastic. The shielding area refers to the area on the product to be coated that does not need to be coated. The shielding method may include screen printing, dispensing, or coating.

[0037] The water-soluble protective substance may include a water-soluble solid, a water-soluble liquid, or a water-soluble colloid. The water-soluble liquid may be, but is not limited to, a water-soluble protective oil.

[0038] The water-soluble protective oil includes, but is not limited to, 15%-25% of a water-soluble resin, 1%-3% of an auxiliary agent, and 72%-84% of a solvent.

[0039] The water-soluble resin includes one of a waterborne acrylic resin, a water-soluble epoxy resin, a water-soluble alkyd resin, polyvinyl alcohol, polyethylene oxide, or a waterborne cellulose derivative. Preferably, it is a waterborne acrylic resin, which can endow the ink with film-forming property and adhesion.

[0040] The auxiliary agent may include, but is not limited to, one or more of an antifoaming agent, a thickening agent, or a wetting agent. It can adjust the fluidity, stability, and drying speed of the water-soluble protective oil.

[0041] The solvent includes, but is not limited to, water and alcohol liquids (such as ethanol). Among them, the proportion of water in the water-soluble protective oil is 40%-80%, and the rest is alcohol liquids.

[0042] Replacing traditional organic solvents (such as toluene and ethyl acetate) with water can significantly reduce the emissions of volatile organic compounds (VOCs), meeting the Chinese GB38507-2020 standard; it does not contain heavy metals (such as lead and cadmium) and prohibited plasticizers (such as phthalates), meeting the RoHS and REACH standards.

[0043] Specifically, the water-soluble protective substance can be printed onto the masking area of the product to be coated by means of screen printing.

[0044] A film corresponding to the masking area is designed on the screen printing stencil, and then the stencil is attached to the masking area. The screen printing stencil can be, but is not limited to, a 43-78T stencil. For example, 43T and 77T stencils. 43T means there are 44 mesh holes per inch, which is approximately 112 mesh when converted to the commonly used mesh number in China (1T = 2.54 mesh); 77T means there are 77 mesh holes per inch, corresponding to a mesh number of approximately 200 mesh, and its mesh density is nearly twice that of 44T. In scenarios with high-precision requirements, a 77T stencil can be used. The mesh holes are finer, the ink deposition is more accurate, and it can print finer lines (such as a spacing of 0.1-0.15 mm) and complex patterns, significantly improving the masking accuracy and reducing the problems of ink smudging and ghosting.

[0045] The parameters of the screen printing stencil are as follows: the tension is 6N / CM, and the angle is 45°-75°. In actual production, the parameters are adjusted and matched to the best.

[0046] S2. Fix the water-soluble protective substance on the masking area to obtain the product to be coated after masking.

[0047] Among them, the fixing methods include standing still and / or baking, extrusion, etc.

[0048] Specifically, the product after printing the water-soluble protective substance can be placed in a glue box and left standing for 20 to 60 minutes, such as 30 minutes, at a preset temperature, so that the water-soluble protective substance cures on the shielding area. If the water-soluble protective substance is water-soluble protective oil, the curing principle depends on the evaporation of water, and the resin particles aggregate to form a continuous film layer.

[0049] The preset temperature can be but is not limited to 17 - 27°C, for example 21 - 23°C, and the humidity during standing can be but is not limited to 40% - 60% RH, for example 50% RH. Preferably, the standing temperature is recommended to be maintained at 22°C, and the ambient humidity is recommended to be maintained at 50% RH. The higher the temperature, the shorter the curing time. Too high a temperature will cause the ink to carbonize, and too low a temperature will prolong the curing time; too high a humidity will prolong the curing time, and too low a humidity may cause false drying on the surface while the inside is not dry.

[0050] In some embodiments, in order to shorten the time for fixing the water-soluble protective substance, the product can be baked.

[0051] S3. Coat the product to be coated after masking.

[0052] Specifically, any existing method can be used to coat the product to be coated after masking. Coating includes but is not limited to electroplating or spraying an anti-fingerprint film layer.

[0053] S4. Clean the water-soluble protective substance on the shielding area to obtain the coated product.

[0054] Specifically, the cleaning method can include flat cleaning, ultrasonic cleaning. At a temperature of 30°C - 50°C, for example 40°C, use the flat cleaning method and use a chemical solution or water to clean the water-soluble protective substance on the shielding area.

[0055] Among them, the chemical solution includes glass water and / or neutral cleaning agent. If a chemical solution is used, the ratio of glass water and / or neutral cleaning agent to water can be 1:400.

[0056] The rotational speed of the brush for flat cleaning can be 300 - 350 r / min, for example 330 r / min; the height of the brush can be 0 - 2 mm, for example 1 mm; the conveying speed can be 3 m / min - 5 m / min, for example 4 m / min; the water pressure can be 0.2 - 3 kg / cm 2 , for example 1 kg / cm 2 , 1.5 kg / cm 2 , 2 kg / cm 2 .

[0057] In some embodiments, such asFigure 3 As shown Figure 3 is a schematic diagram of a system for preventing overplating of a film layer. The present invention provides a system for preventing overplating of a film layer, including a shielding device, a curing device, a film coating device, and a cleaning device. Among them,

[0058] The shielding device is used to shield the shielding area on the product to be coated with a water-soluble protective material;

[0059] The curing device is used to fix the water-soluble protective material on the shielding area to obtain the product to be coated after shielding;

[0060] The film coating device is used to coat the product to be coated after shielding;

[0061] The cleaning device is used to clean the water-soluble protective material in the shielding area to obtain the coated product.

[0062] Specifically, the shielding device can be, but is not limited to, a film sticking device; the curing device can be, but is not limited to, a device composed of a glue box or a dryer; the film coating device can be, but is not limited to, a film coating machine in the prior art; the cleaning device can be a machine for flat cleaning. Other technical explanations are the same as those in the foregoing embodiments.

[0063] The present invention also has the following beneficial effects:

[0064] In this solution, the areas that do not need to be coated are shielded with a water-soluble protective material. During film coating, the surface of the water-soluble protective material is dense and will not cause overplating of the film layer due to film layer penetration. After film coating is completed, it can be directly put into water for cleaning, and the water-soluble protective material can be washed away. Compared with local plasma removal, the steps of removing the film layer by plasma can be reduced, and the situation of incomplete plasma removal can be reduced. Compared with peelable glue, the steps of cleaning after sticking the glue and tearing off the peelable glue can be omitted, and there is no residue of peelable glue. Generally speaking, the process flow can be simplified, the cost can be reduced, and the anti-overflow accuracy can be improved.

[0065] Through experiments, the present invention detects the dyne value and whether it is cured, etc., to verify the beneficial effects of the present invention.

[0066] Provide the curing time data of the water-soluble protective oil under different environmental temperatures and humidities: The present invention does not adjust the environmental temperature and humidity. On the premise of adapting to the workshop environmental temperature, the 77T screen plate is verified for multi-gradient time (10 / 20 / 30 min). The water-soluble protective oil has been cured in 30 min for multiple batches, and there is no dyne value NG, so this parameter is fixed. As shown in Table 1, where NG means not good (not up to standard), and OK means up to standard. It proves that the curing time of more than 20 min is feasible

[0067] Table 1

[0068]

[0069] The present invention provides verification of masking accuracy and provides comparison data (such as microscope images) between the masked area after screen printing and the design drawing: After import, the factory has not reported any problems of overplating / underplating of the fingerprint-proof film caused by masking accuracy problems, and the dyne value measured during the production process shows that the masked edge lines are visually straight lines.

[0070] The present invention provides verification data for the cleaning process and provides comparison data for masking accuracy: All are based on the actual effect of the product. As shown in Table 2, it is proved that the present invention has no residue of peelable glue that affects the appearance, and the dyne value meets the standard.

[0071] Table 2

[0072]

[0073]

[0074]

[0075] The above is a specific description of the preferred embodiment of the present invention. However, the present invention is not limited to the described embodiment. Those skilled in the art can make various equivalent deformations or substitutions without departing from the spirit of the present invention, and these equivalent deformations or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A process for preventing film layer overplating, characterized in that, It includes the following steps: Use a water-soluble protective agent to mask the masking area on the product to be coated; Fix the water-soluble protective agent on the masking area to obtain the product to be coated after masking; Coat the product to be coated after masking; Clean the water-soluble protective agent on the masking area to obtain the coated product.

2. The process according to claim 1, characterized in that, The step of using a water-soluble protective agent to mask the masking area on the product to be coated specifically includes: Print the water-soluble protective agent onto the masking area of the product to be coated by means of screen printing or coating; the water-soluble protective agent includes water-soluble protective oil.

3. The process according to claim 2, characterized in that, The water-soluble protective oil includes 15%-25% of water-soluble resin, 1%-3% of additives, and 72%-84% of solvents.

4. The process according to claim 3, characterized in that, The water-soluble resin includes one of waterborne acrylic resin, water-soluble epoxy resin, water-soluble alkyd resin, polyvinyl alcohol, polyethylene oxide, or waterborne cellulose derivatives.

5. The process according to claim 3, characterized in that, The additives include one or more of defoaming agents, thickeners, or wetting agents.

6. The process according to claim 3, characterized in that, The solvents include water and / or alcohol liquids.

7. The process according to claim 1, wherein The step of fixing the water-soluble protective agent on the masking area specifically includes: Let the product to be coated stand for 20 minutes to 60 minutes at a preset temperature to cure the water-soluble protective agent on the masking area.

8. The process according to any one of claims 1-7, characterized in that, The step of cleaning the water-soluble protective agent on the masking area specifically includes: At a temperature of 30°C - 50°C, clean the water-soluble protective agent on the masking area with a chemical solution or water.

9. The process according to claim 8, characterized in that, The chemical solution includes glass water and / or neutral cleaning agent.

10. A system for preventing over-plating of a film layer, characterized in that, It includes a masking device, a curing device, a coating device, and a cleaning device. Among them, The masking device is used to mask the masking area on the product to be coated with a water-soluble protective agent; The curing device is used to fix the water-soluble protective agent on the masking area to obtain the product to be coated after masking; The coating device is used to coat the product to be coated after masking; The cleaning device is used to clean the water-soluble protective agent on the masking area to obtain the coated product.

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