by winding helically

Full Title

Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor (B29C73/00 takes precedence; by blowing B29C49/00; by thermoforming B29C51/00) > Lining or sheathing of internal surfaces (B29C63/38 takes precedence) > using sheet or web-like material > by winding helically