pack
(also reel pack), n.
The smoothness and tension of the wind of film or tape on a hub.
Notes
A good pack is free from buckling, cinching, and other wind irregularities.
Citations
UNESCO 2001 Tape packs are wound under a considerable amount of tension. This is necessary to maintain the shape of the tape pack. A reel of tape can be permanently damaged if the tape pack tension is too high or too low. If the tension is too high, the tape backing can stretch. If the tension gets too low, tape layers can slip past each other, resulting in pack slip, cinching, or popped strands on playback.
