A filament bundle is rewound from a reel, and passes through various sorts of
liquid
in processing vessels to be used for plating. The filament bundle passes through
a fixed guide roller and a movable guide roller while it travels within the liquid
in the processing vessel. The movable guide roller is moved periodically, the filament
bundle is stretched and slackened by turns, whenever the filament bundle is slackened
or untied, the bundle is loosened. The filament bundle with each filament subjected
to the plating is taken up to a take-up reel.
