Thermoplastic polyurethane (TPU) flexible glue vacuum plating process

Abstract

The invention discloses a TPU flexible glue vacuum plating process which comprises the following steps: S1, incoming material inspection: inspecting a TPU flexible glue base material in a clean environment to ensure that the TPU flexible glue base material meets process requirements; s2, cleaning is conducted, specifically, the TPU flexible glue base material is cleaned, surface grease, a residual release agent and dust pollutants are removed, and the adhesive force of a plating layer is improved; s3, wiping and clamping are conducted, specifically, the surface of the TPU soft rubber base material is further cleaned through dust-free cloth and a special solvent, corners and concave areas are emphatically treated, it is guaranteed that the surface is dry and free of residues, and then a workpiece is fixed to a film coating frame; and S4, on-line spraying is conducted, the oil spraying color is tarnish color, the material color is tarnish color, and the production technology of primer, prime coat, vacuum coating, floating coat and finish coat is adopted. The design is reasonable, the TPU product subjected to vacuum coating is high in surface hardness and excellent in wear resistance, the coating is good in compactness and can tolerate daily friction and chemical corrosion, and the service life is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of TPU coating, and particularly to a TPU soft glue vacuum plating process. Background Art

[0002] TPU (thermoplastic polyurethane) is a polymer material with both rubber elasticity and plastic processing properties, mainly divided into polyester type and polyether type. It has a wide hardness range (60HA - 85HD), is wear-resistant, oil-resistant, transparent, and has good elasticity, and is widely used in the fields of daily necessities, sports goods, toys, decorative materials, etc.

[0003] However, at present, the surface of TPU materials has the following limitations: Appearance defects: Bubbles and oil stains (such as mold release agent residues) are easily generated during injection molding, resulting in an uneven surface; Insufficient functionality: Native TPU lacks metallic texture, wear resistance, and anti-aging performance, and it is difficult to meet high-end decoration or functional requirements; Poor weather resistance: It is easily affected by ultraviolet rays and ages, and has a high water absorption rate, affecting dimensional stability. Therefore, we propose a TPU soft glue vacuum plating process to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems existing in the prior art, and a TPU soft glue vacuum plating process is proposed. The surface hardness of the TPU product after vacuum plating is high, the wear resistance is excellent, and the coating has good compactness, can withstand daily friction and chemical corrosion, and extends the service life.

[0005] In order to achieve the above purpose, the present invention adopts the following technical scheme:

[0006] The TPU soft glue vacuum plating process includes the following steps:

[0007] S1. Incoming material inspection: Inspect the TPU soft glue substrate in a clean environment to ensure that the TPU soft glue substrate meets the process requirements;

[0008] S2. Cleaning: Clean the TPU soft glue substrate to remove surface grease, residual mold release agent, and dust pollutants, and improve the coating adhesion;

[0009] S3. Wiping + clamping: Use a dust-free cloth and a special solvent to further clean the surface of the TPU soft glue substrate, focus on treating the corners and concave areas, ensure the surface is dry and residue-free, and then fix the workpiece on the coating rack;

[0010] S4. Online spraying: The spraying color is patina color, and the material color is selected as patina color. The production process of primer + base coat + vacuum plating + intermediate coat + top coat is adopted. The line speed of the production line is 4.0 ± 0.5 M / min, the temperature of the spraying booth is 22 ± 5 °C, and the relative humidity is 35 - 80%;

[0011] S5. Offline: Inspect the product and quickly visually confirm that there is no obvious color difference or peeling of the film layer;

[0012] S6. Baking: The temperature is 60 - 80 °C and the time is 30 - 60 minutes to eliminate internal stress and improve the durability of the film layer;

[0013] S7. Unclamping: Use a scratch-proof tool to disassemble the product, and handle it gently to avoid scratching the coating;

[0014] S8. Full inspection: The full inspector wears gloves or finger cots and conducts a full inspection according to the SIP inspection requirements. There should be no oil accumulation, paint spots, dirt, particles, color difference, scratches, dents, exposed substrate, missing spray, flash, etc. on the A-level surface of the product;

[0015] S9. Packaging and shipping: Use an environmentally friendly turnover box or packaging materials that meet environmental protection requirements for packaging, and clearly label the batch number, inspection result, and production date.

[0016] Preferably, in S4, the primer paint number is CPR - 32000 PRIMER, the film thickness is 3 - 6 μm, the curing agent number is CPH - 60, the baking temperature is 75 ± 5 °C, the baking time is 8 - 10 min, the oil mixing ratio is 100:10, the dilution viscosity is 8.5″ - 9.5″, the paint filtration is 400 mesh, and the following spray guns are used for spraying in sequence:

[0017] No. 1 spray gun, spray gun height 23.6 mm, front - rear position 12.2 mm, spray gun angle 305°, spray gun pressure 3.5 ± 0.5 kg;

[0018] No. 2 spray gun, spray gun height 0 mm, front - rear position 15.6 mm, spray gun angle 334°, spray gun pressure 3.5 ± 0.5 kg;

[0019] No. 3 spray gun, spray gun height 25.7 mm, front - rear position 17.6 mm, spray gun angle 319°, spray gun pressure 3.5 ± 0.5 kg;

[0020] No. 4 spray gun, spray gun height 14.2 mm, front - rear position 22 mm, spray gun angle 285°, spray gun pressure 3.5 ± 0.5 kg;

[0021] No. 5 spray gun, spray gun height 0 mm, front - rear position 12.4 mm, spray gun angle 232°, spray gun pressure 3.5 ± 0.5 kg;

[0022] No. 6 spray gun, spray gun height 27.2 mm, front - rear position 16.1 mm, spray gun angle 315°, spray gun pressure 3.5 ± 0.5 kg;

[0023] 7# Spray gun, with a spray gun height of 14.2 mm, a front-back position of 22.2 mm, a spray gun angle of 278°, and a spray gun pressure of 3.5 ± 0.5 kg;

[0024] The 1# spray gun, 2# spray gun, 3# spray gun, and 4# spray gun rotate forward, and the 5# spray gun, 6# spray gun, and 7# spray gun rotate backward, with a rotation speed of 20 - 25 r / min.

[0025] Preferably, in S4, the primer paint number is CUT - 2200 (glossy), the film thickness is 3 - 6 μm, the curing agent number is CPH - 60, the thinner number is DLS - 7000, the baking temperature is 75 ± 5 °C, the baking time is 8 - 10 min, the oil mixing ratio is 100:30:30 - 50, the dilution viscosity is 8.5″ - 9.5″, the paint filtration is 300 mesh, and the following spray guns are used for spraying in sequence:

[0026] 1# Spray gun, with a spray gun height of 24.9 mm, a front-back position of 14.2 mm, a spray gun angle of 141°, and a spray gun pressure of 3.5 ± 0.5 kg;

[0027] 2# Spray gun, with a spray gun height of 0 mm, a front-back position of 8.9 mm, a spray gun angle of 229°, and a spray gun pressure of 3.5 ± 0.5 kg;

[0028] 3# Spray gun, with a spray gun height of 26 mm, a front-back position of 16.3 mm, a spray gun angle of 137°, and a spray gun pressure of 3.5 ± 0.5 kg;

[0029] 4# Spray gun, with a spray gun height of 11 mm, a front-back position of 22 mm, a spray gun angle of 172°, and a spray gun pressure of 3.5 ± 0.5 kg;

[0030] 5# Spray gun, with a spray gun height of 0 mm, a front-back position of 7.2 mm, a spray gun angle of 224°, and a spray gun pressure of 3.5 ± 0.5 kg;

[0031] 6# Spray gun, with a spray gun height of 26 mm, a front-back position of 16.8 mm, a spray gun angle of 136°, and a spray gun pressure of 3.5 ± 0.5 kg;

[0032] 7# Spray gun, with a spray gun height of 11.5 mm, a front-back position of 21.9 mm, a spray gun angle of 175°, and a spray gun pressure of 3.5 ± 0.5 kg;

[0033] The 1# spray gun, 2# spray gun, 3# spray gun, and 4# spray gun rotate forward, and the 5# spray gun, 6# spray gun, and 7# spray gun rotate backward, with a rotation speed of 20 - 25 r / min.

[0034] Preferably, in the step S4, the intermediate coat is a vacuum coating. The paint number is CSP#32 CLEAR (BLUE), the film thickness is 6 - 8 μm, the curing agent number is CPH-60, the thinner number is DLS-1500, the baking temperature is 75 ± 5 °C, the baking time is 8 - 10 min, the paint mixing ratio is 100:10:50 - 100, the dilution viscosity is 8.5″ - 9.5″, the paint filtration is 300 mesh, and the following spray guns are used for spraying in sequence:

[0035] Spray gun No. 1, the spray gun height is 24.9 mm, the front-back position is 14.2 mm, the spray gun angle is 141°, and the spray gun pressure is 3.5 ± 0.5 kg;

[0036] Spray gun No. 2, the spray gun height is 0 mm, the front-back position is 8.9 mm, the spray gun angle is 229°, and the spray gun pressure is 3.5 ± 0.5 kg;

[0037] Spray gun No. 3, the spray gun height is 26 mm, the front-back position is 16.3 mm, the spray gun angle is 137°, and the spray gun pressure is 3.5 ± 0.5 kg;

[0038] Spray gun No. 4, the spray gun height is 11 mm, the front-back position is 22 mm, the spray gun angle is 172°, and the spray gun pressure is 3.5 ± 0.5 kg;

[0039] Spray gun No. 5, the spray gun height is 0 mm, the front-back position is 7.2 mm, the spray gun angle is 224°, and the spray gun pressure is 3.5 ± 0.5 kg;

[0040] Spray gun No. 6, the spray gun height is 26 mm, the front-back position is 16.8 mm, the spray gun angle is 136°, and the spray gun pressure is 3.5 ± 0.5 kg;

[0041] Spray gun No. 7, the spray gun height is 11.5 mm, the front-back position is 21.9 mm, the spray gun angle is 175°, and the spray gun pressure is 3.5 ± 0.5 kg;

[0042] The spray gun No. 1, spray gun No. 2, spray gun No. 3, and spray gun No. 4 rotate forwardly, and the spray gun No. 5, spray gun No. 6, and spray gun No. 7 rotate reversely, with a rotation speed of 20 - 25 r / min.

[0043] Preferably, in the step S4, the topcoat paint number is CSF-4900 CLEAR (glossy) GR-DM, the film thickness is 30 - 35 μm, the curing agent number is CPH-60, the thinner number is DLS-7000, the baking temperature is 80 ± 5 °C, the baking time is 30 min, the paint mixing ratio is 100:25:30 - 50, the dilution viscosity is 9.5″ - 10.5″, the paint filtration is 400 mesh, and the following spray guns are used for spraying in sequence:

[0044] 1# Spray gun, spray gun height 23.6 mm, front and rear position 12.2 mm, spray gun angle 305°, spray gun pressure 3.5 ± 0.5 kg;

[0045] 2# Spray gun, spray gun height 0 mm, front and rear position 15.6 mm, spray gun angle 334°, spray gun pressure 3.5 ± 0.5 kg;

[0046] 3# Spray gun, spray gun height 25.7 mm, front and rear position 17.6 mm, spray gun angle 319°, spray gun pressure 3.5 ± 0.5 kg;

[0047] 4# Spray gun, spray gun height 14.2 mm, front and rear position 22 mm, spray gun angle 4 285°, spray gun pressure 3.5 ± 0.5 kg;

[0048] 5# Spray gun, spray gun height 0 mm, front and rear position 12.4 mm, spray gun angle 232°, spray gun pressure 3.5 ± 0.5 kg;

[0049] 6# Spray gun, spray gun height 27.2 mm, front and rear position 16.1 mm, spray gun angle 315°, spray gun pressure 3.5 ± 0.5 kg;

[0050] 7# Spray gun, spray gun height 14.2 mm, front and rear position 22.2 mm, spray gun angle 278°, spray gun pressure 3.5 ± 0.5 kg;

[0051] The 1#, 2#, 3#, and 4# spray guns rotate forward, and the 5#, 6#, and 7# spray guns rotate backward, with a rotation speed of 20 - 25 r / min.

[0052] Preferably, in S4, the electroplating material is indium, the weight of the indium wire is 4.9 g / furnace, the electroplating quantity is 1632 PCS / furnace, the material transfer speed is 5 ± 1 r / min, and the vacuum degree is 7.0x10- 4 .

[0053] Preferably, in S8, the products that pass the full inspection are placed in blister boxes, with 4 PCS products in each cell, waiting for the next process for packaging.

[0054] Preferably, in S4, during the spraying process of the primer, undercoat, intermediate coat, and topcoat, the allowable ± value of the gun adjustment parameters is within 10%.

[0055] Compared with the prior art, the beneficial effects of the present invention are:

[0056] In this TPU soft rubber vacuum plating process, before spraying, the TPU soft rubber substrate is inspected to ensure that the surface of the raw material has no defects, which is beneficial to ensuring the subsequent coating quality. Through vacuum plating, a metallic luster effect is given to the TPU surface, meeting the high aesthetic requirements of the product. The coating has good barrier properties, can reduce the water vapor transmission rate, is suitable for high humidity environments or sealed packaging requirements, and the coating has a relatively high hardness, which can increase the number of wear-resistant times, delay the aging of the TPU substrate, and extend the service life. Brief Description of the Drawings

[0057] Figure 1 is a schematic flow chart of the TPU soft rubber vacuum plating process proposed by the present invention;

[0058] Figure 2 is a schematic diagram of the primer process parameters of the TPU soft rubber vacuum plating process proposed by the present invention;

[0059] Figure 3 is a schematic diagram of the undercoat process parameters of the TPU soft rubber vacuum plating process proposed by the present invention;

[0060] Figure 4 is a schematic diagram of the intermediate coat process parameters of the TPU soft rubber vacuum plating process proposed by the present invention;

[0061] Figure 5 is a schematic diagram of the topcoat process parameters of the TPU soft rubber vacuum plating process proposed by the present invention;

[0062] Figure 6 is a schematic diagram of the product appearance of the TPU soft rubber vacuum plating process proposed by the present invention;

[0063] Figure 7 is a schematic diagram of the full inspection of the TPU soft rubber vacuum plating process proposed by the present invention;

[0064] Figure 8 is a schematic diagram of the inspection standard angle of the TPU soft rubber vacuum plating process proposed by the present invention;

[0065] Figure 9 is a schematic diagram of putting the fully inspected product of the TPU soft rubber vacuum plating process into a blister box. Detailed Embodiments

[0066] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0067] Refer to Figures 1-9 , the TPU soft rubber vacuum plating process includes the following steps:

[0068] Before operation: Confirm that the materials used are environmentally friendly materials with RoHS labels, such as molds, tools, jigs, auxiliary materials, mold release agents, cleaning agents, raw materials, etc.; confirm whether the machine equipment is clean, and whether the regular maintenance and inspection records are in place; confirm whether the operators wear harmful substance protection supplies before operation.

[0069] S1. Incoming inspection: Inspect the material, thickness, surface flatness, appearance integrity, dimensional tolerance, surface cleanliness, etc. of the TPU soft rubber substrate (specifically the cantilever) in a clean environment to ensure that the TPU soft rubber substrate meets the process requirements. Specifically, visually inspect the surface of the TPU soft rubber substrate for defects such as scratches, bubbles, and impurities; use a caliper or projector to measure whether the thickness, radian, etc. meet the drawing requirements; verify the physical properties of the material through tensile testing and hardness testing (such as Shore hardness); use the hierarchical sampling method or S-shaped sampling method to conduct spot checks according to the batch ratio. Ensure that the raw materials have no defects such as cracks, scratches, and bubbles to avoid poor coating quality in the subsequent process.

[0070] S2. Cleaning: Clean the TPU soft rubber substrate to remove surface grease, residual mold release agent, and dust pollutants to improve the coating adhesion. Specifically, for chemical cleaning, alkaline or acidic cleaning agents can be used for soaking to remove surface organic substances; for physical cleaning, ultrasonic cleaning or plasma treatment can be used to enhance surface activation. After cleaning, the surface needs to pass the continuous water film test (no water breakage phenomenon), and the residual particulate matter detection needs to meet the standard of ≤0.1mg / cm².

[0071] S3. Wiping + clamping: Use a dust-free cloth and a special solvent (such as isopropyl alcohol) to further clean the surface, focusing on treating the corners and concave areas to ensure that the surface is dry and residue-free, and then fix the workpiece on the coating rack. Specifically, the fixture is customized to avoid deformation of the TPU or blocking of the coating area, and high-temperature-resistant fixtures are used to prevent deformation during the coating process. After clamping, check the fixing stability to prevent displacement during the vacuum coating process.

[0072] S4. Online spraying: The spraying color is patina color, and the material color is selected as patina color. The production process of primer + base coat + vacuum coating + intermediate coat + top coat is adopted. The production line speed is 4.5M / min, the spraying room temperature is 25°C, and the relative humidity is 60%.

[0073] The paint number of the primer is CPR-32000 PRIMER, the film thickness is 4um, the curing agent number is CPH-60, the baking temperature is 75°C, the baking time is 9min, the oil mixing ratio is 100:10, the dilution viscosity is 9.0″, and the paint filtration is 400 meshes. Spray with the following spray guns in sequence:

[0074] No. 1 spray gun, spray gun height 23.6mm, front and rear position 12.2mm, spray gun angle 305°, spray gun pressure 3.5kg;

[0075] No. 2 spray gun, spray gun height 0 mm, front - rear position 15.6 mm, spray gun angle 334°, spray gun pressure 3.5 kg;

[0076] No. 3 spray gun, spray gun height 25.7 mm, front - rear position 17.6 mm, spray gun angle 319°, spray gun pressure 3.5 kg;

[0077] No. 4 spray gun, spray gun height 14.2 mm, front - rear position 22 mm, spray gun angle 285°, spray gun pressure 3.5 kg;

[0078] No. 5 spray gun, spray gun height 0 mm, front - rear position 12.4 mm, spray gun angle 232°, spray gun pressure 3.5 kg;

[0079] No. 6 spray gun, spray gun height 27.2 mm, front - rear position 16.1 mm, spray gun angle 315°, spray gun pressure 3.5 kg;

[0080] No. 7 spray gun, spray gun height 14.2 mm, front - rear position 22.2 mm, spray gun angle 278°, spray gun pressure 3.5 kg;

[0081] No. 1 spray gun, No. 2 spray gun, No. 3 spray gun, No. 4 spray gun rotate forward, No. 5 spray gun, No. 6 spray gun, No. 7 spray gun rotate backward, rotation speed 22 r / min. The primer spraying can fill the surface micropores, enhance the adhesion of the coating, and cover the residual oil stains.

[0082] The primer paint number is CUT - 2200 (glossy), film thickness 4 μm, the curing agent number is CPH - 60, the thinner number is DLS - 7000, baking temperature is 75 °C, baking time is 9 min, the oil - mixing ratio is 100:30:30, dilution viscosity is 9.0″, paint filtration is 300 mesh, and the following spray guns are used for spraying in sequence:

[0083] No. 1 spray gun, spray gun height 24.9 mm, front - rear position 14.2 mm, spray gun angle 141°, spray gun pressure 3.5 kg;

[0084] No. 2 spray gun, spray gun height 0 mm, front - rear position 8.9 mm, spray gun angle 229°, spray gun pressure 3.5 kg;

[0085] No. 3 spray gun, spray gun height 26 mm, front - rear position 16.3 mm, spray gun angle 137°, spray gun pressure 3.5 kg;

[0086] No. 4 spray gun, spray gun height 11 mm, front - rear position 22 mm, spray gun angle 172°, spray gun pressure 3.5 kg;

[0087] No. 5 spray gun, spray gun height 0 mm, front-back position 7.2 mm, spray gun angle 224°, spray gun pressure 3.5 kg;

[0088] No. 6 spray gun, spray gun height 26 mm, front-back position 16.8 mm, spray gun angle 136°, spray gun pressure 3.5 kg;

[0089] No. 7 spray gun, spray gun height 11.5 mm, front-back position 21.9 mm, spray gun angle 175°, spray gun pressure 3.5 kg;

[0090] No. 1 spray gun, No. 2 spray gun, No. 3 spray gun, and No. 4 spray gun rotate forward, while No. 5 spray gun, No. 6 spray gun, and No. 7 spray gun rotate backward, with a rotation speed of 22 r / min.

[0091] The electroplating material is indium. The weight of indium wire is 4.9 g per furnace, the electroplating quantity is 1632 PCS per furnace, the material transfer speed is 5 r / min, and the vacuum degree is 7.0x10- 4 .

[0092] The intermediate coating is vacuum coating. The chamber vacuum degree needs to reach 10⁻³ Pa to ensure the coating uniformity. The paint number is CSP#32CLEAR(BLUE), the film thickness is 7 μm, the curing agent number is CPH-60, the thinner number is DLS-1500, the baking temperature is 75 °C, the baking time is 9 min, the paint mixing ratio is 100:10:50, the dilution viscosity is 9.0″, the paint filtration is 300 meshes, and the following spray guns are used for spraying in sequence:

[0093] No. 1 spray gun, spray gun height 24.9 mm, front-back position 14.2 mm, spray gun angle 141°, spray gun pressure 3.5 kg;

[0094] No. 2 spray gun, spray gun height 0 mm, front-back position 8.9 mm, spray gun angle 229°, spray gun pressure 3.5 kg;

[0095] No. 3 spray gun, spray gun height 26 mm, front-back position 16.3 mm, spray gun angle 137°, spray gun pressure 3.5 kg;

[0096] No. 4 spray gun, spray gun height 11 mm, front-back position 22 mm, spray gun angle 172°, spray gun pressure 3.5 kg;

[0097] No. 5 spray gun, spray gun height 0 mm, front-back position 7.2 mm, spray gun angle 224°, spray gun pressure 3.5 kg;

[0098] No. 6 spray gun, spray gun height 26 mm, front-back position 16.8 mm, spray gun angle 136°, spray gun pressure 3.5 kg;

[0099] 7# Spray gun, spray gun height 11.5 mm, front-back position 21.9 mm, spray gun angle 175°, spray gun pressure 3.5 kg;

[0100] Spray guns 1#, 2#, 3#, and 4# rotate forward, and spray guns 5#, 6#, and 7# rotate backward, with a rotation speed of 22 r / min.

[0101] The topcoat paint number is CSF-4900 CLEAR (gloss) GR-DM, the film thickness is 32 μm, the hardener number is CPH-60, the thinner number is DLS-7000, the baking temperature is 80 °C, the baking time is 30 min, the paint mixing ratio is 100:25:30, the dilution viscosity is 10.0″, the paint filtration is 400 mesh, and the following spray guns are used for spraying in sequence:

[0102] 1# Spray gun, spray gun height 23.6 mm, front-back position 12.2 mm, spray gun angle 305°, spray gun pressure 3.5 kg;

[0103] 2# Spray gun, spray gun height 0 mm, front-back position 15.6 mm, spray gun angle 334°, spray gun pressure 3.5 kg;

[0104] 3# Spray gun, spray gun height 25.7 mm, front-back position 17.6 mm, spray gun angle 319°, spray gun pressure 3.5 kg;

[0105] 4# Spray gun, spray gun height 14.2 mm, front-back position 22 mm, spray gun angle 285°, spray gun pressure 3.5 kg;

[0106] 5# Spray gun, spray gun height 0 mm, front-back position 12.4 mm, spray gun angle 232°, spray gun pressure 3.5 kg;

[0107] 6# Spray gun, spray gun height 27.2 mm, front-back position 16.1 mm, spray gun angle 315°, spray gun pressure 3.5 kg;

[0108] 7# Spray gun, spray gun height 14.2 mm, front-back position 22.2 mm, spray gun angle 278°, spray gun pressure 3.5 kg;

[0109] Spray guns 1#, 2#, 3#, and 4# rotate forward, and spray guns 5#, 6#, and 7# rotate backward, with a rotation speed of 22 r / min.

[0110] During the spraying process of the primer, undercoat, intermediate coat, and topcoat, the allowable ± value of the gun adjustment parameters is within 10%.

[0111] S5, off-line: Inspect the product and quickly visually confirm that there is no obvious color difference or peeling of the film layer.

[0112] S6, Baking: Temperature is 70°C, time is 45 minutes (adjust according to the heat resistance of TPU), to eliminate internal stress and improve the durability of the film layer. The oven should be kept clean to avoid secondary dust pollution.

[0113] During the operation process, ensure that the production environment is clean and there is no mixing of non-environmentally friendly materials.

[0114] S7, Unclamping: Use anti-scratch tools for unclamping, and handle gently to avoid scratching the coating.

[0115] S8, Full inspection: The full inspector wears gloves or finger cots and conducts a full inspection according to the SIP inspection requirements. There should be no oil accumulation, paint spots, dirt, particles, color differences, scratches, dents, exposed substrate, missed spraying, flash, etc. on the A-level surface of the product (the painted surface is the A-level surface). For specific appearance requirements, refer to the appearance sample signed by the Quality Department and the SIP. Then, place the products that pass the full inspection into blister boxes, with 4 PCS products in each grid, waiting for the next packaging process. Specifically, the appearance should ensure no pinholes, no bubbles, and no color difference (refer to the standard color board); use an X-ray fluorescence spectrometer (XRF) to detect thickness uniformity; conduct a cross-cut test (ASTM D3359) to detect adhesion, with a requirement of ≥ 4B level; use a rubber friction test to test its abrasion resistance, with no exposed substrate after 500 times. During the inspection operation process, finger cots or gloves must be worn and replaced every two hours. The brightness of the operation area is 850 LUX. During inspection, pay attention to protecting the products, handle them gently, and there should be no dents, bumps, scratches, etc. Place the products that pass the full inspection neatly in blister boxes, waiting for the next packaging process.

[0116] S9, Packaging and shipping: Use environmentally friendly turnover boxes or packaging materials that meet environmental protection requirements. Specifically, use anti-static bags or vacuum packaging to avoid film layer oxidation, add desiccant, and control the humidity ≤ 30%RH. The batch number, inspection result, and production date should be clearly marked. Stick a RoHS label on the turnover box or packaging and place it in the special area for RoHS products.

[0117] The above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, should be covered by the protection scope of the present invention.

Claims

1. The TPU soft glue vacuum plating process is characterized in that It includes the following steps: S1. Incoming inspection: Inspect the TPU soft rubber substrate in a clean environment to ensure that the TPU soft rubber substrate meets the process requirements; S2. Cleaning: Clean the TPU soft rubber substrate to remove surface grease, residual mold release agent, and dust contaminants, and improve the adhesion of the coating; S3. Wiping + clamping: Further clean the surface of the TPU soft rubber substrate with a dust-free cloth and a special solvent, focusing on treating the corners and concave areas to ensure that the surface is dry and residue-free, and then fix the workpiece on the coating rack; S4. Online spraying: The spraying color is patina color, and the color of the material is selected as patina color. The production process of primer + undercoat + vacuum coating + intermediate coat + topcoat is adopted. The line speed of the production line is 4.0 ± 0.5 M / min, the temperature of the spray booth is 22 ± 5 °C, and the relative humidity is 35 - 80%; S5. Offline: Inspect the product and quickly visually confirm that there is no obvious color difference or peeling of the film layer; S6. Baking: The temperature is 60 - 80 °C and the time is 30 - 60 minutes to eliminate internal stress and improve the durability of the film layer; S7. Unclamping: Use a scratch-proof tool to disassemble the product, and handle it gently to avoid scratching the coating; S8. Full inspection: The full inspector wears gloves or finger cots and conducts a full inspection according to the SIP inspection requirements. There should be no oil accumulation, paint spots, dirt, particles, color difference, scratches, dents, exposed substrate, missing spraying, clamping line burrs and other defects on the A-level surface of the product; S9. Packaging and shipping: Use an environmentally friendly turnover box or packaging materials that meet environmental protection requirements for packaging, and clearly label the batch number, inspection results, and production date.

2. The TPU soft glue vacuum plating process according to claim 1, characterized in that, In the above S4, the paint number of the primer is CPR-32,000 PRIMER, the film thickness is 3 - 6 μm, the curing agent number is CPH-60, the baking temperature is 75 ± 5 °C, the baking time is 8 - 10 min, the oil mixing ratio is 100:10, the dilution viscosity is 8.5″ - 9.5″, the paint filtration is 400 mesh, and the following spray guns are used for spraying in sequence: 1# spray gun, the height of the spray gun is 23.6 mm, the front and rear position is 12.2 mm, the spray gun angle is 305°, and the spray gun pressure is 3.5 ± 0.5 kg; 2# spray gun, the height of the spray gun is 0 mm, the front and rear position is 15.6 mm, the spray gun angle is 334°, and the spray gun pressure is 3.5 ± 0.5 kg; 3# spray gun, the height of the spray gun is 25.7 mm, the front and rear position is 17.6 mm, the spray gun angle is 319°, and the spray gun pressure is 3.5 ± 0.5 kg; 4# spray gun, the height of the spray gun is 14.2 mm, the front and rear position is 22 mm, the spray gun angle is 285°, and the spray gun pressure is 3.5 ± 0.5 kg; 5# spray gun, the height of the spray gun is 0 mm, the front and rear position is 12.4 mm, the spray gun angle is 232°, and the spray gun pressure is 3.5 ± 0.5 kg; 6# spray gun, the height of the spray gun is 27.2 mm, the front and rear position is 16.1 mm, the spray gun angle is 315°, and the spray gun pressure is 3.5 ± 0.5 kg; 7# spray gun, the height of the spray gun is 14.2 mm, the front and rear position is 22.2 mm, the spray gun angle is 278°, and the spray gun pressure is 3.5 ± 0.5 kg; The 1# spray gun, 2# spray gun, 3# spray gun, and 4# spray gun rotate forward, and the 5# spray gun, 6# spray gun, and 7# spray gun rotate backward, with a rotation speed of 20 - 25 r / min.

3. The TPU soft glue vacuum plating process according to claim 1, wherein, In S4, the primer paint number is CUT - 2200 (glossy), the film thickness is 3 - 6 μm, the curing agent number is CPH - 60, the thinner number is DLS - 7000, the baking temperature is 75 ± 5 °C, the baking time is 8 - 10 min, the paint mixing ratio is 100:30:30 - 50, the dilution viscosity is 8.5″ - 9.5″, the paint filtration is 300 mesh, and the following spray guns are used for spraying in sequence: 1# spray gun, spray gun height 24.9 mm, front - rear position 14.2 mm, spray gun angle 141°, spray gun pressure 3.5 ± 0.5 kg; 2# spray gun, spray gun height 0 mm, front - rear position 8.9 mm, spray gun angle 229°, spray gun pressure 3.5 ± 0.5 kg; 3# spray gun, spray gun height 26 mm, front - rear position 16.3 mm, spray gun angle 137°, spray gun pressure 3.5 ± 0.5 kg; 4# spray gun, spray gun height 11 mm, front - rear position 22 mm, spray gun angle 172°, spray gun pressure 3.5 ± 0.5 kg; 5# spray gun, spray gun height 0 mm, front - rear position 7.2 mm, spray gun angle 224°, spray gun pressure 3.5 ± 0.5 kg; 6# spray gun, spray gun height 26 mm, front - rear position 16.8 mm, spray gun angle 136°, spray gun pressure 3.5 ± 0.5 kg; 7# spray gun, spray gun height 11.5 mm, front - rear position 21.9 mm, spray gun angle 175°, spray gun pressure 3.5 ± 0.5 kg; The 1# spray gun, 2# spray gun, 3# spray gun, and 4# spray gun rotate forward, and the 5# spray gun, 6# spray gun, and 7# spray gun rotate backward, with a rotation speed of 20 - (END] 4. The TPU soft glue vacuum plating process according to claim 1, characterized in that, In S4, the intermediate coat is vacuum coating, the paint number is CSP#32 CLEAR (BLUE), the film thickness is 6 - 8 μm, the curing agent number is CPH - 60, the thinner number is DLS - 1500, the baking temperature is 75 ± 5 °C, the baking time is 8 - 10 min, the paint mixing ratio is 100:10:50 - 100, the dilution viscosity is 8.5″ - 9.5″, the paint filtration is 300 mesh, and the following spray guns are used for spraying in sequence: 1# spray gun, spray gun height 24.9 mm, front - rear position 14.2 mm, spray gun angle 141°, spray gun pressure 3.5 ± 0.5 kg; 2# spray gun, spray gun height 0 mm, front - rear position 8.9 mm, spray gun angle 229°, spray gun pressure 3.5 ± 0.5 kg; 3# spray gun, spray gun height 26 mm, front - rear position 16.3 mm, spray gun angle 137°, spray gun pressure 3.5 ± 0.5 kg; 4# spray gun, spray gun height 11 mm, front - rear position 22 mm, spray gun angle 172°, spray gun pressure 3.5 ± 0.5 kg; 5# spray gun, spray gun height 0 mm, front - rear position 7.2 mm, spray gun angle 224°, spray gun pressure 3.5 ± 0.5 kg; No. 6 spray gun, spray gun height 26 mm, front-back position 16.8 mm, spray gun angle 136°, spray gun pressure 3.5 ± 0.5 kg; No. 7 spray gun, spray gun height 11.5 mm, front-back position 21.9 mm, spray gun angle 175°, spray gun pressure 3.5 ± 0.5 kg; The No. 1, No. 2, No. 3, and No. 4 spray guns rotate forward, and the No. 5, No. 6, and No. 7 spray guns rotate backward, with a rotation speed of 20 - 25 r / min.

5. The TPU soft glue vacuum plating process according to claim 1, characterized in that, In S4, the topcoat paint number is CSF - 4900 CLEAR (gloss) GR - DM, the film thickness is 30 - 35 μm, the curing agent number is CPH - 60, the thinner number is DLS - 7000, the baking temperature is 80 ± 5 °C, the baking time is 30 min, the oil mixing ratio is 100:25:30 - 50, the dilution viscosity is 9.5″ - 10.5″, the paint is filtered through 400 meshes, and the following spray guns are used for spraying in sequence: No. 1 spray gun, spray gun height 23.6 mm, front-back position 12.2 mm, spray gun angle 305°, spray gun pressure 3.5 ± 0.5 kg; No. 2 spray gun, spray gun height 0 mm, front-back position 15.6 mm, spray gun angle 334°, spray gun pressure 3.5 ± 0.5 kg; No. 3 spray gun, spray gun height 25.7 mm, front-back position 17.6 mm, spray gun angle 319°, spray gun pressure 3.5 ± 0.5 kg; No. 4 spray gun, spray gun height 14.2 mm, front-back position 22 mm, spray gun angle 285°, spray gun pressure 3.5 ± 0.5 kg; No. 5 spray gun, spray gun height 0 mm, front-back position 12.4 mm, spray gun angle 232°, spray gun pressure 3.5 ± 0.5 kg; No. 6 spray gun, spray gun height 27.2 mm, front-back position 16.1 mm, spray gun angle 315°, spray gun pressure 3.5 ± 0.5 kg; No. 7 spray gun, spray gun height 14.2 mm, front-back position 22.2 mm, spray gun angle 278°, spray gun pressure 3.5 ± 0.5 kg; The No. 1, No. 2, No. 3, and No. 4 spray guns rotate forward, and the No. 5, No. 6, and No. 7 spray guns rotate backward, with a rotation speed of 20 - 25 r / min.

6. The TPU soft glue vacuum plating process according to claim 1, characterized in that, In S4, the electroplating material is indium. The weight of the indium wire is 4.9 g / furnace, the electroplating quantity is 1632 PCS / furnace, the material transfer speed is 5 ± 1 r / min, and the vacuum degree is 7.0x10- 4 .

7. The TPU soft glue vacuum plating process according to claim 1, characterized in that, In S8, the products that pass the full inspection are placed in blister boxes, with 4 PCS products in each grid, waiting for the next process of packaging.

8. The TPU soft glue vacuum plating process according to claim 1, wherein, In S4, during the spraying process of the primer, undercoat, intermediate coat, and topcoat, the allowable ± value of the gun adjustment parameters is within 10%.

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