The use of etching and electroplating methods to produce metal signs is the most commonly used method in the sign industry. With the development of science and technology, the application of computers, the appearance of materials, and the birth of new technologies, this ancient and practical signmaking method has been injected with infinite vitality. Screen printing etched electroplating and other processes are completely integrated, not only can produce more beautiful signs, more magnificent medals, but also produce endless changes in daily necessities, gifts, crafts.
1 Fine Etching Etching is usually performed by etching and electrolysis on the surface of the metal plate to create a sag to achieve engraving. It can be divided into hollow etching, surface etching and three kinds of products that have both an ammonium hollow etching and a surface etching. Usually the thinnest etching line is about 0.3mm, and our company can produce about 0.1mm thin lines. Surface etching can usually reach 0.15mm lines, and our company can produce 0.04mm thin lines. So called fine etching. The process of fine etching is basically the same as ordinary etching, ie:
Substrate Cleaning - Ink Resist Printing - Drying - Exposure - Development - Etching - Defilming - Plating The basic operations are as follows:
1.1 Patterns and film production Since finely etched products have already entered the scope of art, they must combine the artistic factors such as the shape, layout, color, and light reflection in particular with the conditions allowed by the production process. The thinnest line of hollow products should be 1.2 times or more than the thickness of the substrate; the thinnest line spacing of surface etching products should be about 0.16mm, which is 0.1:3mm. The ratio of black line to white line can be made 1:3 depending on the degree of reflection. , 2:2, 2:1. The double-sided etching product should be clearly and accurately aligned around the front and back film sheets, and both the front and back sheets should be attached to the substrate.
1.2 Plate Treatment (Take Copper Plate as an Example)
The front of the sheet is polished with 2400 rpm/distribution wheel to achieve a mirror effect, and then it is waxed, degreasing, washed and dried.
1.3 screen printing photoinduced photosensitive adhesive because of the production of fine patterns. Can not be repaired after the development, so choose a good emulsion is particularly important. Our company chooses Coates photoimaging anti-corrosion inks to print with 200 mesh full screen under yellow light or red light, the first time to print the surface, bake for 15 minutes at 100°C, the second time to print the reverse side, After baking at 100°C for 30 minutes, the surface is not sticky before exposure.
1.4 Exposure Aspiration Plate Exposure. The exposure time ranges from 20 to 100 seconds. The finer the lines, the longer the exposure time and vice versa.
1.5 Development with 3-5% sodium carbonate aqueous solution, water temperature at about 50 °C, blisters a few seconds later, the soft wool brush gently brushed the aqueous solution, and then rinse with water twice, to achieve no glue residue. The wet copper plate is etched directly, but it can also be dried before etching.
1.6 etching can be etched in two ways:
A, electrolytic method: current 15-50A, voltage 3-5V, electrolyte: 20% ammonium chloride, 20% potassium chloride, 20% sulfuric acid, anode titanium plate. During the electrolysis process, the electrolytic copper is left floating on the anode in time to ensure the normal passage of the current.
B, ferric chloride method: use more pure ferric chloride bubble into a 30-degree B solution, flow corrosion. For the same layout to achieve different shades of effect, the surface should be cleaned and dried after reaching the shallowness requirement for the first time. An ordinary etching resistant ink is applied (printed) at the shallow etching, and a second etching is performed.
1.7 Removing the film The etched copper plate is heated to 70° C. in water, sodium hydroxide and potassium cyanide 30:1:0.1 solution to remove the film and washed out.
1.8 The copper plate pattern after plating is very bright and very thin. It is not necessary to plate bright copper again. It can be directly plated with nickel for 40-90 seconds, followed by gold plating and silver plating.
2 screen printing coloring electroplating production of coloring in the past is the use of manual coloring and electrophoresis coloring two methods. Manual coloring, slow speed, poor accuracy, and extreme damage to non-colored surfaces. Electrophoretic coloring:
(1) Have special equipment;
(2) Have a certain amount of batches;
(3) Monotonically limited color paint.
Screen printing color plating is to print the various colors on the metal plate to be electroplated by using the screen printing method. Then electroplating is performed to completely solve the defects of the above two methods.
Substrate Polishing and Cleaning - Screen Printing Coloring (Ink Color Printing) - Final Drying 150°C-1.5 Hours - Nickel Plating - Gold Plating (Silver)
Screen printing color plating process flow: the specific operation is as follows:
2.1 Cleaning Substrates NOTE:
A: Before the substrate is polished, washed, and then taken out of water until it is printed and dried, gloves must be worn during the entire process. Never touch it directly with your hands.
B, substrate polishing to achieve the surface of all hydrophilic, no markings after drying.
2.2 Make screen printing plate with 300 mesh polyester screen plate, the bridge is better, residual glue should be thoroughly washed and there is no trachoma and broken lines.
2.3 Select screen printing ink selection of acid, alkali, temperature, strong hiding power of metal screen printing ink, the company selected Japan Seiko 1300 # ink.
2.4 Fine Screen Printing Thoroughly Drying Select Hardness Medium Low Scratch Re-inking Screen Printing to achieve thick and uniform ink layer, no broken lines and trachoma, printed in one color (100 °C, 10 minutes), the last time it is printed in Dry 150°C, 1.5 hours.
2.5 Before degreasing and drying before plating, place it in a normal temperature degreasing agent (warmed to 60°C), soak for 5-10 seconds to remove oil, and then clean it to check if it is completely hydrophilic. Not up to the requirements, you can brush with a nylon brush to achieve hydrophilic.
2.6 Direct nickel plating, gold plating (silver)
Usually electroplating is preceded by copper plating followed by gold plating (silver), while copper plating baths have a PH value of 0-1 and nickel and gold baths have a PH value of 3.8-4.6. At present, there is no acid-resistant ink with a pH value of 0-1 in the world. (Seiko 1300 # ink acid resistance is PH value is 3) so direct nickel plating, avoid strong acid off, with nickel to increase, brighten. Although the speed is slower and the cost is higher, it has little effect on products with high value-added coefficients and small quantities. Nickel plating current 30A, voltage 5V, cathode movement, increase of 0.3mm take 18-20 minutes, need to increase again, delay can be. After cleaning and gold plating (silver).
1 Fine Etching Etching is usually performed by etching and electrolysis on the surface of the metal plate to create a sag to achieve engraving. It can be divided into hollow etching, surface etching and three kinds of products that have both an ammonium hollow etching and a surface etching. Usually the thinnest etching line is about 0.3mm, and our company can produce about 0.1mm thin lines. Surface etching can usually reach 0.15mm lines, and our company can produce 0.04mm thin lines. So called fine etching. The process of fine etching is basically the same as ordinary etching, ie:
Substrate Cleaning - Ink Resist Printing - Drying - Exposure - Development - Etching - Defilming - Plating The basic operations are as follows:
1.1 Patterns and film production Since finely etched products have already entered the scope of art, they must combine the artistic factors such as the shape, layout, color, and light reflection in particular with the conditions allowed by the production process. The thinnest line of hollow products should be 1.2 times or more than the thickness of the substrate; the thinnest line spacing of surface etching products should be about 0.16mm, which is 0.1:3mm. The ratio of black line to white line can be made 1:3 depending on the degree of reflection. , 2:2, 2:1. The double-sided etching product should be clearly and accurately aligned around the front and back film sheets, and both the front and back sheets should be attached to the substrate.
1.2 Plate Treatment (Take Copper Plate as an Example)
The front of the sheet is polished with 2400 rpm/distribution wheel to achieve a mirror effect, and then it is waxed, degreasing, washed and dried.
1.3 screen printing photoinduced photosensitive adhesive because of the production of fine patterns. Can not be repaired after the development, so choose a good emulsion is particularly important. Our company chooses Coates photoimaging anti-corrosion inks to print with 200 mesh full screen under yellow light or red light, the first time to print the surface, bake for 15 minutes at 100°C, the second time to print the reverse side, After baking at 100°C for 30 minutes, the surface is not sticky before exposure.
1.4 Exposure Aspiration Plate Exposure. The exposure time ranges from 20 to 100 seconds. The finer the lines, the longer the exposure time and vice versa.
1.5 Development with 3-5% sodium carbonate aqueous solution, water temperature at about 50 °C, blisters a few seconds later, the soft wool brush gently brushed the aqueous solution, and then rinse with water twice, to achieve no glue residue. The wet copper plate is etched directly, but it can also be dried before etching.
1.6 etching can be etched in two ways:
A, electrolytic method: current 15-50A, voltage 3-5V, electrolyte: 20% ammonium chloride, 20% potassium chloride, 20% sulfuric acid, anode titanium plate. During the electrolysis process, the electrolytic copper is left floating on the anode in time to ensure the normal passage of the current.
B, ferric chloride method: use more pure ferric chloride bubble into a 30-degree B solution, flow corrosion. For the same layout to achieve different shades of effect, the surface should be cleaned and dried after reaching the shallowness requirement for the first time. An ordinary etching resistant ink is applied (printed) at the shallow etching, and a second etching is performed.
1.7 Removing the film The etched copper plate is heated to 70° C. in water, sodium hydroxide and potassium cyanide 30:1:0.1 solution to remove the film and washed out.
1.8 The copper plate pattern after plating is very bright and very thin. It is not necessary to plate bright copper again. It can be directly plated with nickel for 40-90 seconds, followed by gold plating and silver plating.
2 screen printing coloring electroplating production of coloring in the past is the use of manual coloring and electrophoresis coloring two methods. Manual coloring, slow speed, poor accuracy, and extreme damage to non-colored surfaces. Electrophoretic coloring:
(1) Have special equipment;
(2) Have a certain amount of batches;
(3) Monotonically limited color paint.
Screen printing color plating is to print the various colors on the metal plate to be electroplated by using the screen printing method. Then electroplating is performed to completely solve the defects of the above two methods.
Substrate Polishing and Cleaning - Screen Printing Coloring (Ink Color Printing) - Final Drying 150°C-1.5 Hours - Nickel Plating - Gold Plating (Silver)
Screen printing color plating process flow: the specific operation is as follows:
2.1 Cleaning Substrates NOTE:
A: Before the substrate is polished, washed, and then taken out of water until it is printed and dried, gloves must be worn during the entire process. Never touch it directly with your hands.
B, substrate polishing to achieve the surface of all hydrophilic, no markings after drying.
2.2 Make screen printing plate with 300 mesh polyester screen plate, the bridge is better, residual glue should be thoroughly washed and there is no trachoma and broken lines.
2.3 Select screen printing ink selection of acid, alkali, temperature, strong hiding power of metal screen printing ink, the company selected Japan Seiko 1300 # ink.
2.4 Fine Screen Printing Thoroughly Drying Select Hardness Medium Low Scratch Re-inking Screen Printing to achieve thick and uniform ink layer, no broken lines and trachoma, printed in one color (100 °C, 10 minutes), the last time it is printed in Dry 150°C, 1.5 hours.
2.5 Before degreasing and drying before plating, place it in a normal temperature degreasing agent (warmed to 60°C), soak for 5-10 seconds to remove oil, and then clean it to check if it is completely hydrophilic. Not up to the requirements, you can brush with a nylon brush to achieve hydrophilic.
2.6 Direct nickel plating, gold plating (silver)
Usually electroplating is preceded by copper plating followed by gold plating (silver), while copper plating baths have a PH value of 0-1 and nickel and gold baths have a PH value of 3.8-4.6. At present, there is no acid-resistant ink with a pH value of 0-1 in the world. (Seiko 1300 # ink acid resistance is PH value is 3) so direct nickel plating, avoid strong acid off, with nickel to increase, brighten. Although the speed is slower and the cost is higher, it has little effect on products with high value-added coefficients and small quantities. Nickel plating current 30A, voltage 5V, cathode movement, increase of 0.3mm take 18-20 minutes, need to increase again, delay can be. After cleaning and gold plating (silver).
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