
Composite bag printing is classified as gravure printing, which is a plate
making skill that carves a depression on the surface of a picture. Generally
speaking, copper or zinc plates are chosen as the surface of the carving, and
some of the concave ones can be printed using corrosion, carving, copper
engraving, or mezzotint metal plate making methods. Collagraphs may be based on
gravure printing.
During the rotation process of the gravure cylinder, the ink from the ink
bucket is carried onto the layout, and under the effect of the ink scraper, some
of the blank ink on the layout is scraped away. The plastic film passes through
the period between the gravure cylinder and the imprinting cylinder. By
utilizing the pressure between the measuring cylinders, some ink from the
concave images and texts on the gravure cylinder is transferred to the
substrate. When the substrate passes through the drying oven, the solvent in the
ink evaporates under the thermal effect, and it is sequentially fed into the
next unit to complete multi-color printing. Due to the varying depth of
indentation of images and text on the printing plate, the depth of the ink layer
that can be accommodated is also different. When transferred to the surface of
the printed material, solid and colorful printed images and text are obtained by
overlaying the ink.
Having understood gravure printing, we must understand that before printing
composite bags, it is necessary to manufacture copper plates. The circumference
and length of the copper plates are determined based on the detailed size of
your food bag. Copper plate is made for the plate making company (so why do you
need to pay the plate fee before making the goods). If you already have a plate,
you can send it directly.
Here's why some customers say the printing fee is so high, as composite bags
are gravure printed, which is completely different from the printing of goods in
paper boxes and non-woven bags. This is a draft engraved on an iron plate and
then printed on a machine. The edition fee is required for the first production,
and if there are no changes to the artwork in the future, there will be no
edition fee required for reproduction
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