The basic principle of porous printing

Porous printing (Stencil Printing)
Porous printing principle is the role of the scraper, screen box, screen printing inks from wire mesh in the drain to the printing substrates, the printing plate non-image part of the wire mesh because the ink is jam, ink can not leak to the substrates, thus completing the printed matter.

Any ink printed on a three-dimensional, such as bottles, printed circuit board surface and the general, multi-hole printing.

Layout for the network or has a thin layer of flexible, transparent graphic part, ink or pigment through the plates to the substrates were missing, with the lithography, letterpress, gravure printing tied for the first three 4 printing . However, there are still people used it was placed under the special printing areas.

Porous printing type version, transcribed Kong version, typing porous and screen printing 4 types, but also have several different plate methods. They have equipment, portable, simple process, easy to operate features, widely used.

① Type Edition. In the wood, cardboard, metal or plastic sheet on the carved text or graphics, stencil print made by brush or spray the way to make pigment printing plates through to the substrate. This is one of the oldest techniques. Printed fabric from the judge unearthed ancient China has been adopted based version of Spring and Autumn Period. The method is simple because of the 20th century, there are still 80 years of civil application.

 ② transcribed porous. Plate with the handwritten method, was first with a brush dipped in acid (eg sulfuric acid) in the porous coating of gelatin on paper depicting graphic, acid will be dissolved next film, exposing the porous fibers to form a hole version, called the brush transcribed version. The acid corrosion of susceptible edge graphics, printing less accuracy, stylus transcribed version appears, this method is rarely used. Stylus with the stylus in the transcribed version of a steel plate has a netted plates made of carved wax paper, waxed paper can be carved some ink. This method is passed as T.A. Edison invented in 1886 years. Because transcription of the handwriting varies, much less typing was invented clearly shaped hole version, the application has been declining. Transcribed version of a pen dipped into the washing water-soluble glue to write on porous paper, and then coated with a layer of paper's film does not dissolve in water, dry after washing, stripping writing section, the formation of porous.

③ type porous. Use of movable type printing to typewriter to wax paper on the impact of the waxed paper to form type to the text through the porous ink. 80 19th century in the United States the first English typewriter a practical system models, Chinese typewriter, first in Japan, Taisho period (1912 ~ 1926), spread rapidly after World War II. Computer word processing and office automation system development, have gradually replaced hole type printing.

④ screen printing. Since the 20th century, 50 holes since become the mainstream of printing.

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