What is the difference between fan-folded polybags and polybags on a reel?

What is the difference between fan-folded polybags and polybags on a reel?

'Fan-folded bags' are laid-flat concertinaed polybags supplied in boxes. The box of bags is positioned at the back of the autobagger and the chain of bags is threaded through into the machine via a clam-shell design. 'Bags on reels' denote a chain of bags wrapped around a central spool that is mounted on the machine and fed directly into the printer.

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