Fiber Products, Prepregs, Composites and Method of Producing Same

A 3-dimension (3D) multi-layer composite, comprising:

• a first fiber sheet with a first plurality of fastening components on both surfaces of the first fiber sheet, the first plurality of fastening components penetrating through the first fiber sheet and extending outwardly from both surfaces of the first fiber sheet;
• and
• a second fiber sheet with a second plurality of fastening components on both surfaces of the second fiber sheet, the second plurality of fastening components penetrating through the second fiber sheet and extending outwardly from both surfaces of the second fiber sheet,
• wherein the first plurality of fastening components mechanically engage with the second plurality of fastening components,
• wherein the first and second plurality of fastening components are put on the first and second fiber sheets by flocking;
• wherein at least one of the first fiber sheet and the second fiber sheet has an adhesive net film on a top, and/or a bottom side of said at least one of the first fiber sheet and the second fiber sheet, and the fastening components of the first or second fiber sheet having the adhesive net film extend in or through the adhesive net film;
• wherein the first and second fiber sheets have sufficiently large openings for allowing penetration of the fastening components through said fiber sheets.