Scanner lingo explained: the carrier sheet
A carrier sheet is a transparent plastic jacket which is used for scanning fragile documents. Very thin papers, frequently kinked records or delicate family documents like old photographs and certificates, can be torn or damaged due to today’s very fast working document feed. Carrier sheets can prevent this and the scan quality stays the same due to the specific texture of the sheet.
A3 format documents can also be digitised with an A4 scanner thanks to the carrier sheet. To do this, the A3 document is folded, put into the carrier sheet and scanned from both the front and the back side. The software will then create one document from both scanned sides automatically.
Carrier sheets are available in specialist shops.