Document carriers should be used for any large document that can that is considered irreplaceable, or for documents that are very thin or have damage. A scanning department should always have carrier sheets on hand, for damaged documents, they are reusable and if handled carefully, they can last for a long time.
Graphtec carrier sheets are made of two sheets of polyester film, a clear top sheet and a white backing sheet. The two sheets are attached along one edge. They are not the best for intricate image details or weak lines but they are very durable and seem to outlast the Colortrac sheets. These can cause problems with Colortrac scanners, due to thickness.
The document is placed between the two sheets of film and then fed through the scanner, inserting the hinged side first. The document is safely transported through the scanner without any damage, even if there are tears, folds, damaged edges or holes in the original.
Carrier sheets are sometimes called document wallets.