| 摘要 |
A folder for use in the transport of an original sheet (25) and a copy sheet (26), engaged with each other, past the heat radiator in a thermocopying machine has a cover sheet (22) of thermally and mechanically resistant plastics foil which is permeable to infra-red rays. To reduce the amount of heat transferred to the copying material by convection, the cover sheet as an irregular surface. The irregularities (23, 24) are produced by a subsequent treatment of smooth plastics foil. An irregular surface may optionally be imparted to the carrier sheet (21) of the folder as well to reduce the contact area with the surrounding parts and thus the transfer of heat by convection. |
