Stamping process

Stamping machines are basically classified by their functioning principle :
FLAT / FLAT (up and down machine)
ROUND / FLAT (cylinder machine)
ROUND / ROUND (rotary stamping machine)

The selection of the suitable stamping process depends on :
- size and complexity of the image
- needed support and run rate
- sheet or web fed

Flat - Flat

Stamping process FLAT / FLAT
Die and counter die are flat.
The stamping is done by an up and down vertical or clamshell movement.
The dies transfer the foil by means of pressure and temperature.
Pressure and dwell time is adjustable.
Flat on flat stamping is ideal for stamping deeper reliefs and structures.

Round - Flat

The counter pressure is generated by a stamping cylinder containing a counter die.
The stamping cylinder transports the paper sheet and unrolls it over the flat stamping die.
The stamping occurs as a single line of foil transfer, effectively rolling it onto the sheet. 

The Round - Flat process has following advantages :

  • The single line foil transfer avoids air trapping.
  • Stamping larger solid surfaces are easier with relatively low temperature.
  • Perfect edge definition is obtained due to short contact time.

Round - Round

Both tools, the stamping die as well as the counter die are round (respectively flexible). 
Stamping is accomplished in a single line of contact for foil transfer.
The contact time is extremely short.
The process is suitable for sheet and web fed.

The Round - Round process has following advantages :

  • High production speed.
  • Suitable for larger order quantities.
  • No air trapping due to single line foil transfer.
  • Larger solid areas can be accomplished at relatively low temperature.
  • Perfect edge definition is obtained by short contact time.