文档介绍：Lesson 11
Package Printing
第11课包装印刷
Introduction
The objective of package printing and decorating is to
create a visibly identifiable image, consistently, for a
large number of impressions. these have been divided
into two groups:
"Printing" in the context of this discussion refers to
flexography, lithography and gravure--the methods that
account for the vast majority of all packaging graphic art.
Each of these methods has a number of variations.
"Decorating" is used to describe a number of special
methods such as screen printing, hot foil stamping,
embossing, and pad printing.
Printing Methods
Printing an image requires the ability to transfer fluid ink
or another marking medium onto the substrate in the
desired pattern. There are dozens of ways of doing this,
but the bulk of package printing can be grouped in three
basic categories based on the fundamental geometry of
the printing plate:
Relief : Variations are flexography (commonly referred
to as flexo), letterpress, and offset letterpress (commonly
referred to as dry offset)
Printing Methods
Planographic: The process is known as offset
lithography monly referred to as lithography,
offset or litho
Gravure: The process is rotogravure, sometimes
called roto and occasionally referred to as intaglio
Printing presses have the following features mon
regard1ess of the actual printing method used:
An accurate material feed system that will present
substrate to the printing station in precise register.
An ink reservoir or ink fountain and a method of
introducing ink into the printing train.
Printing Methods
A means of metering ink so that the amount applied is
consistent over the print run.
A way of configuring the ink to the required pattern.
This is done by the printing plates, one for each color.
A means of transferring ink to the substrate by
pressing the substrate between the ink-bearing surface
and an impression roll.
Since inks are applied as fluids, a means of dryi