With the development of the pen industry and the needs of the fountain pen market and export services, the fountain pen is required to have internal qualities such as fluency in writing, and to be in line with the fountain pens of the world's brand Duke, Picasso, etc. for decoration in the shape of the pen. And artistic, this is the key to winning merchants. For this reason, to change the previous concept of paying attention only to the conventional and not paying attention to the appearance requirements, it is necessary to innovate the appearance of the fountain pen and the processing technology of the pen barrel and pen cover. After being renovated, the fountain pen is not only used for writing, but also becomes a handicraft that everyone carries with him.
This is not to discuss how the water fountain pen is made, but to describe how the outer surface decoration processing technology of the water fountain pen's stainless steel barrel and pen cover has been manufactured and formed. Everyone knows that after treatment, stainless steel presents different colors. This is a conventional decoration processing method, which is already an ancient craft on the market and will not be introduced. I will only introduce how to make golden, silver and white colors on the pen holder and pen cover, and have a three-dimensional projection pattern, so that the three-dimensional patterns and text will be permanently retained on the pen holder and pen cover, and will not be worn by the hand, it will become Carrying cultural utensils and artistic handicrafts.
How to meet the above requirements? The non-screen printing method is impossible, and only by combining screen printing and electrochemical coating organically can we achieve perfect results.
This article introduces how to use screen printing and electrochemical coating methods to make the main process of embossing convex patterns on stainless steel pen holders and pen covers, so that this method will further process a variety of process products on different material surfaces. , Bring beautiful enjoyment to people's lives, making the flower of silk screen printing more colorful.
1. Screen printing parameters and requirements
The fountain pen holder and pen cover are made of hollow cylindrical stainless steel material with a diameter of about 10mm. The surface is smooth and clean. To make protruding landscape paintings, birds and beasts, characters, poetry, etc. on the outer surface, the most ideal method is a curved screen Combining printing and electrochemical coating, the parts that do not need to be patterned are protected by special printing materials (ink) through screen printing, and then electroplated to make the leaked pattern parts be plated with metal, and finally form a convex Out of the embossed pattern on the surface of the pen barrel and pen cover. According to the difference of electroplating, the pattern can get different color decoration. To meet the above requirements, the following conditions should be met.
Screen printing equipment and materials:
①Net frame: select aluminum alloy profile frame with a length of 250mm ～ 300mm and a width of 200mm ～ 250mm;
â‘¡ Wire mesh: Nylon, polyester wire mesh or stainless steel wire mesh can be used. The key is that the mesh size of the wire mesh is appropriate;
③Photosensitive adhesive: Solvent-resistant Ketuta or Komelai Diazo Photosensitive Adhesive and capillary are generally used. The thickness of the photosensitive film is controlled at 30um ～ 50um;
â‘£Exposure equipment: The photocopying lamp selects the spectral wavelength range from 330nm to 420nm;
⑤Squeegee: generally 8mm ～ 10mm thick, oil resistant rubber with a hardness of 65 ° ～ 75 °, please note that the blade edge of the scraper must be straight, and processed into a chamfer of 45 ° on both sides; or 65 ° ～ 75 ° polyurethane finished rubber scraper;
â‘¥Ink requirements: acid resistance, good covering performance and high insulation resistance should be selected.
⑦Printing machine: self-made curved screen printing machine or purchase special curved screen printing machine. The self-made curved screen printing machine adopts four 80025 ball bearings as the support frame of the pen barrel and the pen cover, as shown in the following schematic diagram.
The bearing of the curved screen printing machine is fixed on a pair of bearing fixing frames with an axial positioning device for the workpiece, and the distance between the bearings can be adjusted according to the diameter of the workpiece.
The working principle of curved screen printing: the cylindrical workpieces such as the fountain pen barrel or pen sleeve are placed on four fixed ball bearings with a certain angle, and the screen template with ink is placed close to the upper bus bar of the pen barrel or pen sleeve, as the blade of the ink scraping plate Perpendicular to the axis of the workpiece, the screen moves parallel to the axis of the workpiece. Due to the pressure of the squeegee and the frictional force of the screen template, the pen or pen sleeve is driven to rotate concentrically. The ink is scraped by the scraper The screen is printed on the workpiece. Take out the printed work piece, put it into the next work piece, press down the screen template, repeat the above operation procedure, and one piece of work piece will be screen printed. [next]
2. Description of the technological process and its main procedures
1. Process flow
Degreasing treatment of stainless steel pen holder and cover → cleaning → drying → screen stencil printing SP2595 anti-plating ink → drying → retouching → drying → electrolytic polishing → weak acid etching → cleaning → pre-plated nickel → pre-plated copper → plated copper (chrome, Silver or gold, etc.) → Remove ink → Dry packaging, etc.
Note: The imitation gold coloring process is to remove the SP2595 ink after the copper plating of the barrel and pen cover, and then process in the imitation gold liquid.
2. Description of the main process of screen printing
①Draw black and white manuscripts: The pattern area should be within the range defined by the circumference of the pen barrel and pen cover multiplied by the magnification, that is, it should be smaller than the diameter of the pen barrel and pen cover multiplied by π and then multiplied by the magnification selected when drawing Magnification, place the pattern on the coated paper, and then reduce the photographs and make copies of the sun-printed negative film required by the same magnification for screen printing. For simple patterns, it can also be drawn directly on the transparent polyester film base in a 1: 1 ratio instead of the sun-print negative film. No matter which method is used, the density of the pattern part on the negative film must be ensured to obtain good results.
②The selected wire mesh can be stainless steel and monofilament flat woven nylon or polyester wire mesh. The mesh size should be within the range of 100 ～ 150T / cm according to the fineness of the pattern. If it is less than 100T, the printing pattern will be rough; if it is greater than 150T Otherwise, the ink coverage of the non-pattern part is not good, and the phenomenon of "bleeding" will occur during electroplating, which will destroy the clarity of the entire screen, and in serious cases, the ink will fall off.
â‘¢Photosensitive film (adhesive): Since solvent-based ink is used, the photosensitive material should be solvent-resistant. You can use Ketutai Capillary 25 ~ 35 film or Ketutai PIUSII photosensitive adhesive to make the screen template.
â‘£Principle of ink selection: The ink must be compatible with the plating solution used, that is, the ink should not be dissolved, softened or peeled off in the plating solution; the coverage of the ink should be good, and it should have good thixotropy or plasticity And the construction is convenient; the ink should have a high resistance value to ensure that the non-pattern parts are not coated with any metal, so that the pattern is clear and not deformed, etc .; the removal of the ink is convenient, and the plating layer and the workpiece are not damaged during the ink removal process.
3. The main problems in the screen printing process
â‘ The scraping pressure of the squeegee must be perpendicular to the axis of the workpiece, and the blade edge of the squeegee must be in parallel contact with the generatrix of the workpiece, so that the squeegee, screen, and workpiece are in line contact during the entire process , So as to ensure that the workpiece rotates around its own axis, so that the printed pattern is clear and the position is accurate;
â‘¡ During the scraping process, the workpiece can only rotate around its own axis, and cannot move axially. Therefore, an axial positioning device must be installed on the curved screen printing machine, so as to ensure that the position of the pattern on the workpiece is accurate, and the pattern on all the workpieces is consistent, and the repeat accuracy of the pattern is guaranteed;
â‘¢ In order to make the ink and the work piece firmly combined, before screen printing, the work piece must be degreased and other surface treatments, and the processed work piece should be placed in a dust-free place to be printed. Otherwise, even if there is a small stain on the pattern, it will hinder the deposition of the plating layer and cause defects on the pattern;
â‘£The ink should be prepared in advance before use to make the solvent penetrate fully and evenly. It has good thixotropic performance and is more convenient for screen printing;
⑤ After the screen printing, you should carefully check and repair the exposed parts and remove the stains on the electroplated parts. The electroplating can only be done after the ink is completely dry, otherwise, unnecessary scrap will occur.
⑥ Drying, SP2595 screen drying after 90 ℃ ～ 120 ℃, the time depends on the thickness.
The work piece is mounted on the plating rack on the electrode of the plating tank, and is plated according to the requirements of various plating process specifications. It should be noted here that the contact between the workpiece and the hanger must be reliable, and the contact between the hanger and the rod on the plating tank must be reliable. After the electroplating is finished, the tools are removed to remove the ink, and surface treatment is performed to obtain the finished pen holder, pen cover or other decorative crafts.
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