| 摘要 |
The invention concerns a roll for a paper machine, which roll (10) comprises an axle (11), on whose support the roll (10) is fitted to revolve, and a surface construction (13), which is connected to the axle by means of support pieces (14). The openness of the surface construction (13) of the roll (10) is preferably higher than 20 %, so that, when the roll (10) revolves, an effect is produced that sucks air inwards into the roll (10), whereby a flow of air through the roll (10) arises. Also, the invention concerns a dryer group, which comprises two contact-drying cylinders and at least one reversing roll (10) and in which dryer group single-wire draw is applied. At least one of the reversing rolls (10) in the dryer group is an open roll (10), whose surface construction (13) has an openness, preferably higher than 20 %, so that the flow of air travelling along with the wire passes through the open surface construction (13) into the interior of the roll (10) and is discharged further out along with the wire as an air flow through the open surface construction (13) of the roll (10).
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