What is 3Di?
3Di™ is a unique, patented sailmaking technology that allows laminated sails to approach the balanced
loadbearing and shapeholding of a rigid airfoil. In simplified technical terms, 3Di is a flexible composite
membrane built from pre-impregnated spread filament tapes applied in multiple axes and thermo-formed on
a 3D (3DL) mold.
What is a spread filament tape?
How are spread filament tapes made?
Spread filament tapes, the foundation of 3Di, are produced on North’s own “pregger”, a machine that spreads
yarns into an ultra-thin layer of individual filaments, coats those filaments with adhesive and adds a backer.