What are the four categories and characteristics of Langfang printing?

The main types of printing include flattened Langfang printing, Kong Langfang printing, letterpress Langfang printing, and gravure Langfang printing.

Lithography is sometimes called chemical printing, meaning that the printed image is on the same plane as the printing plate. It is based on the "oil and water is not mixed" principle to achieve printing. This type of printing is performed by mechanically or manually presenting the image on a stone or metal surface, and then chemically treating the surface such that the image portion is ink-receptive and the other portions are not ink-repellent. When printing, only ink-infected parts of the image are transferred to the paper to form a print. Photographic printing, photolithography and offset printing are all lithographic printing.

Stencil printing includes stencil printing, stencil printing, spray printing, and screen printing. The principle of stencil printing is: the printing plate (the aperture of the printing plate or other printing plate can be used to make the ink through the hole) at the time of printing, the ink is transferred to the substrate (paper, ceramic, etc.) through the hole of the stencil through a certain pressure. ), forming an image or text. In stencil printing, the most widely used is screen printing.

Letterpress printing is one of the oldest printing methods. It is printed using a relief with a raised surface. During printing, the ink is applied to the surface of the pattern and then imprinted on the paper. The ink on the surface of the pattern is transferred to the surface of the paper to form a print. Handprint printing, Leno's full-line caster printing, lead printing, electro-printing and photo-engraving are all relief printing.

Gravure printing is a printing method in which the printing plate forms a concave character or image by manually engraving the line or engraving it mechanically. When printing, the line or groove is first filled with ink, and the prepared paper is pressed against it. The paper sticks the ink away to form a print. Etching, acupuncture and gravure are gravure printing.