Continuous production of profiles in a sandwich type of construction with foam cores and rigid-foam-filled profile
View Patent ↗The present invention relates to a novel process for the production of novel fiber-reinforced profile materials comprising a rigid foam core, in particular a PMI foam core. In particular, the present invention relates to a novel process which can be carried out in two variants, a short Pul-press process and a Pul-shape process. One step here produces a fiber-reinforced profile material and simultaneously inserts the rigid foam core into same. The same step moreover ensures very good binding of the rigid foam core to the fiber-reinforced profile material.
1. A process for continuous production of fibre-reinforced profiles comprising a foam core, the process comprising:
a) introducing foam cores and connecting a newly introduced foam core to an end of the most recently introduced foam core;
b) wrapping a fibre material around the foam core;
c) impregnating the fibre-material wrap with a resin;
d) optionally moulding the wrapped foam core in a first mould;
e) heating and thereby optionally hardening the resin in a second mould;
f) cooling the wrapped foam core in a third mould; and
g) separating individual profiles by cutting or sawing and removing the finished workpiece,
wherein the second and third mould are moved in respectively mutually opposite direction on carriages.
2. The process according to claim 1 , wherein the foam core takes the form of a plurality of successive individual pieces when it is continuously passed into a pultrusion plant, and the individual pieces are connected to one another by adhesion bonding or insertion or through addition of a coupling piece.
3. The process according to claim 1 , wherein the fibre material is carbon fibres, glass fibres, polymer fibres, or textile fibres.
4. The process according to claim 1 , wherein the resin is a thermoset.
5. The process according to claim 1 , wherein the fibre material is in the form of individual fibres, rovings, non-wovens, woven fabrics and/or laid scrims.
6. The process according to claim 1 , wherein the foam core is a core comprising poly(meth)acrylimide.
7. The process according to claim 6 , wherein polymethacrylimide in the density range from 30 to 200 kg/m 3 is used as material for the foam core.
8. The process according to claim 1 , wherein the fibre material in the wrapping is a prefabricated preform made of the fibre material.
9. The process according to claim 1 , wherein the process is conducted as Pul-press process in which a) to g) take place in moulds or, respectively, devices that are separate from one another.
10. The process according to claim 1 , wherein the process is carried out as Pul-shape process in which the first and the second mould are the same mould, in which c), d) and e) are carried out simultaneously.
11. The process according to claim 1 , wherein the fibre material is aramid fibres.
12. The process according to claim 1 , wherein the resin is a thermoset comprising a material comprising a polyester resin, a vinyl ester resin, a phenolic resin, a PU resin, an epoxy resin, or any combination thereof.
13. The process according to claim 1 , wherein the resin is a thermoset comprising a material comprising a PU resin or an epoxy resin.
14. The process according to claim 1 , wherein the wrapping is carried out with rotating winding equipment.
15. The process according to claim 1 , wherein the wrapping is wrapping a plurality of various layers of the fibre material around the foam core in a braid structure.