Embossing: The main adhesive

What is embossing: The printed portion of a letterpress printing plate is higher than the blank portion, and all printing portions are on the same plane. During printing, ink is applied to the printing portion. Since the blank portion is lower than the printing portion, ink cannot be adhered, and then the substrate such as paper is brought into contact with the printing plate, and a certain pressure is applied to make the ink transfer on the printing portion of the printing plate. Go to the paper and get the printed product. Since the blank portion is concave, the blank portion of the printed product is slightly projected when the pressure is applied, so that the surface of the printed product has an inconspicuous unevenness.

The main advantages:

1, faster;

2. The cost of equipment is lower than traditional offset printing and gravure printing;

3. It is convenient for group editions, easy to add or delete, and can be used for printing of simple jobs in a large number or very small batches.

4, ink thick, strong gloss, ink performance is good, about 80%;

5. Printed plate graphics, printing pressure, bright color fonts and lines clear, strong strokes; color strength and durability is stronger than offset printing, slightly worse than screen printing, but the level of embodiment and degree of registration are stronger than silk Web printing and flexo printing.

Limitations:

1. Poor logotype will affect lines; platemaking is not easy to control;

2, prone to increase in network conditions;

3. Rotary letterpress machine adjusts printing color difference by controlling ink flow and printing pressure in the ink fountain; it is very unstable in the printing process and often needs to rely on the operator's experience to adjust in real time;

4, rotary printing machine in a large area of printing, it is prone to uneven ink, even a white phenomenon.

However, the size of letterpress printing equipment is now quite different. There are round-pressing and flattening printing machines, ordinary rotary printing presses, professional hatchback type, satellite type or machine type label printing machines, so they cannot be generalized.

Field of application: suitable for paper, plastic, sticker printing.

Future trends: Embossing is now being replaced by plain printing in many areas, but only in the field of old letterhead, envelopes and other text printing and carton packaging printing; in China, the technology and equipment used in the printing of stickers and other labels still Toppan printing is mainly used. Flat-pressing and flat-pressing flat-panel printing equipment is gradually shrinking or even eliminated. Round-pressing round-rotation, round-circular reciprocating paper-feeding half-spinning embossing equipment has begun to be domesticated, and new flexographic printing has also been developed. It is beginning to bring a glimmer of vitality to ancient embossing for mass production.