Canon iR3530 Manual page 206

■ If You Do Not Want to Print on the Interleaf Sheets:
The [Leave Blank] setting outputs a printed transparency and a blank interleaf sheet alternately.
4
■ If You Want to Print on the Interleaf Sheets:
The [Print] setting outputs a printed transparency and a printed interleaf sheet alternately.
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Transparency Interleaving
Originals
Blank Interleaf Sheets
Originals
Printed Interleaf Sheets
Copies
Transparencies
Copies
Transparencies