2-4 Theory of Printing
Rev AA
• The printhead traverses across the ribbon, causing print to transfer
onto substrate.
• The printhead presses against a flat platten pad.
Continuous Motion Printing
Continuous motion printing (Figure 2-3 on page 2-5) is the concept used
for printing on moving packaging films in packaging equipment that has a
continuous moving action each time a product is packed. Such
applications can be found in Continuous Vertical Form Fill Seal (VFFS)
and Horizontal Form Fill Seal (HFFS) or flow-wrap machines.
Continuous motion printing has the following features:
• The substrate moves while the printhead is stationary
• Speed of the substrate is monitored by an encoder
• The ribbon and the substrate speeds are matched by the ribbon drive
• The printhead presses against a rotating print roller
1
2
3
4
1. Ribbon Transferred Carbon
2. Substrate
3. Platten Rubber
4. Thermal Printhead
Figure 2-2: Intermittent Printing Motion
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