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The difference between the rotary letterpress and flexography

2018-08-20

Today it is not easy to find most label-printing converters having a combination of technologies in Rotary letterpress, flexo, offset and digital. This is according to the labels specific and the printing effect through the letterpress printing and flexo printing has 85% similar to the effects.


The difference is here :

A. The Feature is different between the Rotary Letterpress and the flexo.

Letterpress refers generically to a printing technology where image areas are raised on a plate in relief from non-image area.

The plate's raised parts are coated with more viscous ink and pressed against the substrate for printing.

Flexo used the special low-viscosity inks, like the water-based ink.


B. Inking system is different.

In Letterpress, the printing cylinder is hard, the inks are more viscous than those employed in conventional flexo.

Ink is released onto the ink rollers via keys, then transferred to plates only after traveling between and among several rollers in the ink train.

This is done to spread the link to the right depth for transfer to the plates.

The Flexo inking system is special, using anilox roll to printing, which deformable plates are wrapped around a rotating printing cylinder.

Ink lay down on conventional flexo ink is from one to 1.5 microns; rotary letterpress ink ranges from 0.75 to one micron.


C. In the narrow web converting industry

The rotary / semi-rotary letterpress' best strength today is in the nutraceutical market, as well as in automotive labeling and cosmetic labeling market,

Wine label printing marker, FMCG industry, pharma also.


D. The time for Job Change is different.

In Rotary Letterpress: Short and Medium runs, with less waste in substrates and inks, Less make-ready wastage, low production speeds, low initial investment.

With Rotary letterpress you just do it with an ink key. Put a job on and run it and get it over with, well before you've decided what anilox roll to use in flexo.


If you have any other rotary letterpress questions, contact on [email protected]


Lingtie (Xiamen ) Machinery has lots of experiences in manufacturing rotary letterpress machine, Which can offer the best price and the newest technology support.

Intermittent Rotary Letterpress Printing Machine

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