Letterpress printing usually uses copper plate and zinc plate, which are made by engraving or etching to make the required layout, but the quality of the engraving layout is still lower than that of the plate made by etching. Therefore, the quality of the layout made by pre-coating photosensitive an

The printing plate is one of the important raw materials for the production of cartons and cartons. Its characteristics are not only related to the printing production efficiency, but also directly affect the printing quality of the product. Due to the different structural characteristics of the plate material, the printing quality and cost are also different.

There are many methods of Relief Printing. It can be selenium from a photographic negative on a metal sheet and corroded to form a relief printing plate, or a photographic negative can be sun-dried on a photosensitive resin to form a relief printing plate; and an electronic engraving machine can be