As for the current engraving and gravure printing stamps, there are several different processes for the printing plates:
1. Mechanical plate-making method: The plate-making machine is a special machine for engraved intaglio printing plate production. There are precise indexing plates on the machine. It can adapt to the specifications of various types of stamps and stamps, and has a plate-pressing device with a pressure of nearly 10 tons. The over-printing process is: the stamp original steel plate, namely the original mold, negative figure, plate pattern concave shape, quench hardening - over-pressure round steel shaft, namely the mother model, positive figure, plate pattern convex shape - round steel shaft Quench hardening - over-press printing plate, namely sub-mode, negative, concave pattern - flat layout - printing plate chrome - on the machine proofing - printing.
2. Electroforming platemaking method: Suitable for the production of printing plates of metals, such as iron, copper, nickel, etc., by electroplating plate method to cast plates. The process flow is: the stamp original steel version, namely the original mold, negative figure, plate pattern concave shape, stamping plastic plate (positive figure, pattern convex shape) - according to the stamp layout welding imposition - flat layout - spray silver, Copper plated (negative, grooved) - Nickel plated (for the mother, positive, plate convex) - Nickel plated for the plate, that is, sub-mode, pattern concave - plate chrome - - The two plates are mechanically bent into semi-circular packages on the roller core - proofing - printing.
Both of the above two platemaking methods have their own advantages and are currently used in the world. The greatest advantage of plate made by electrocasting method is that the layout is smooth, the ink in the blank is easy to be wiped off during printing, the printing plate is clean, the graphic printing is clear and complete, the amount of ink is full, and is mostly used for banknote printing plate making; The plate making method is more mechanical.
3. Corrosion plate-making method: As the hand-engraved stamps are very strict on the technical requirements of the steel plate, the plate-making cycle is long and the cost is high, which brings some unfavorable factors to the stamps production. Therefore, in recent years, a corrosive plate-making system has been implemented internationally. Craftsmanship. This method of etching plate has two common techniques for engraving lines and dots.
The first method is that the stamp artwork designer or steel sculptor draws the manuscript into engraving dots, and the photo-engraving makes the negative of the stamp format, and prints it onto the copper plate to etch it, making a printing plate for engraving and gravure printing. . The second method is to use a computer to press the stamp manuscript pattern and text, imitating the effect of hand-sculpted into painted lines and points.
Now some photo-engraving equipment manufactured in advanced industrial countries are designed with special software for the production of stamp engraving line points; using this software, in addition to the technical personnel familiar with the structure of engraving gravure lines, it is possible to produce close to the hand-carved effect. Graphic, and then make a negative version of the stamp format negative film, print to corrosion on the copper plate, made of engraving gravure printing plate. The corrosive plate making method is applicable to the production of patterns and texts such as landscapes, buildings, decorative patterns, etc.; as for making finer patterns such as sketch portraits, or the method of hand-carving original steel plates is preferable.