What is Letterpress Printing?

Relief Printing. Printing using letterpress (a raised printing plate). Referred to as embossing. Is one of the main printing processes. It has the longest history and has been continuously improved in the long-term development process. Engraving printing The engraving printing technology was invented in the early years of the Tang Dynasty in China. It is the engraving of text or images on wooden boards, removing the parts of the graphics to make the graphics protruding, and then painting with ink and paper printing. This is the most primitive method of embossing. The earliest printable version of the "King Kong Prajna Paramita", which can be traced back to the past, is quite a mature print in engraving.

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The principle of letterpress printing is relatively simple. In letterpress,

The difference between the printed part and the non-printed part is very high, which is exactly the opposite of the letterpress, that is, the inked part of the printing plate has obvious depressions.

advantage:

There are many types of letterpress printed materials. There are various formats, books and magazines with various binding methods, newspapers, picture books, and decorative printed materials. Before printing, the type of printed matter and printing requirements should be clearly understood. use

After the plate is installed, you must make preparations before printing to print.

Preparations include: stacking the paper to be printed, checking the layout, opening the print, checking the quality of the text, and preventing problems such as bad characters and broken strokes. Check whether the specifications and dimensions meet the specified requirements, check

In letterpress printing, the common failures are: dirty back,

Product quality refers to the characteristics of a product that are suitable for a certain use and can meet people's certain needs. There are many uses for printed matter, different varieties, and printing

Toppan Printing

The methods are different. According to the process and equipment of letterpress printing, the quality of printed matter should meet the following requirements:

Size requirements

The tolerance of the size of the fine product format is 0.5mm, and the general product is 1.0mm.

Pressure, ink color

The printing pressure and ink color are even. Text imprint, fine products are clear and complete, and general products have no obvious lack of strokes.

Requirements for the uniformity of printed pages

The uniformity of fine products should be greater than 15/16, and the uniformity of general products should be greater than 14/16.

Sets

In printed book pages, the positive and negative overprinting of each layout is accurate, and the overprint error is less than 1.5mm for fine products, and less than 2.5mm for general products.

Exterior

Fine products, neat printed pages, no stencils, nail shadows, dirty marks, no missing strokes. For general products, printed book pages are clean and tidy, with no obvious misprints, nail marks, dirty marks, and no obvious missing strokes.