Nida-Fusion STF complex
Aimed at producing shaped structures with thickness variations, the Nida-Fusion STF complex is made of :
- Flexible foam core with closed cells to prevent resin absorption.
- Fibres reinforcement on each side of the foam.
- Fiberglass roving, which goes through them obliquely, forming triangulations Truss Network.
Flexible closed cell foam, for the Nida-Fusion STF complex
Used for shaped structures with thickness variations, they are made of Polyethylene (PE) or of Polypropylene (PP). Various qualities are available and the choice will depend on the impregnation method and on the thickness variations to be absorbed..
Foam sheet that can be easily compressed (PE 35kg/m3)
They are used for structures with a high thickness variation.
In that case, the injection pressure will be low, less than 1 kg/cm² and the moulds won't have a high deformation under vacuum effect.
- Length : 1.38 or 2.75 meters
- Width : 1.20 meter
- Thickness : from 10 to 50 mm, according to customers needs
Harder foams (PP 30 kg/m3)
When the shaped parts to be produced have a low thickness variation, this kind of foam board allows the manufacturing of large parts; higher pressures can be used without deformation of the foam board.
Before impregnation, it is always possible to have the foam more elastic locally by compressing it mechanically where it is necessary. This complex, which can be bent at room temperature, can have its curve memorized when heated at 90/100° C during forming.
- Length : 1.83 meter
- Width : 1.22 meter
- Thickness : 5 and 10 mm only
All the reinforcements available in today's market can be used (fiberglass, aramid, carbon):
- Woven fabrics,
- Non woven fabrics,
The Nida-Fusion STF complex is produced with only one layer of closed cell foam reinforcement on each side.
The triangulations of the sandwich material are characterised by :
The spacing corresponds to the distance between two stitches that have the same orientation. It can vary from 10 to 60 mm.
More the spacing of triangulations will be small; better will be the mechanical properties. However, this foam core will be heavier.
Two possibilities :
All the stitching lines are parallel to the length of the foam sheet.
Flexural strength is good in the length side of the sheet.
Off Axis orientation
All the stitching lines are oriented with a 30 degrees angle to the length of the sheet.
This configuration gives good bending resistance across the width of the foam core as well as along the length.