Induction-assisted production method

1. A production method for producing molded articles from fiber composites, the method comprising the steps of:

selecting superparamagnetic particles from a group of superparamagnetic particles becoming coupled to an external alternating magnetic field;

adding the selected superparamagnetic particles to a resin portion of a strip-shaped starting material comprising the resin portion and reinforcing fibers;

continuously advancing the strip-shaped starting material;

heating the continuously advanced strip-shaped starting material by coupling-in an external alternating magnetic field, to which the superparamagnetic particles in the resin portion of the starting material become coupled;

continuously molding the heated starting material into a molded article; and

curing the resin portion in the molded article.

2. The production method of claim 1 , wherein the superparamagnetic particles are added to the resin portion of the starting material at a ratio in a range from 0.1 to 50% by weight of the resin portion.

3. The production method of claim 2 , wherein the superparamagnetic particles are selected from a group of superparamagnetic particles comprising primary particles of single magnetic metal-oxide domains having a diameter in a range from 2 to 100 nm.

4. The production method of claim 3 , wherein the superparamagnetic particles are selected from a group of superparamagnetic particles comprising primary particles embedded in a non-magnetic matrix.

5. The production method of claim 4 , wherein the superparamagnetic particles are selected from a group of superparamagnetic particles comprising primary particles embedded in a non-magnetic matrix selected from metal-oxide and metalloid-oxide matrices.

6. The production method of claim 1 , wherein the reinforcing fibers run unidirectionally in a direction in which the starting material is continuously advanced.

7. The production method of claim 6 , wherein the starting material is continuously advanced by pulling.

8. The production method of claim 1 , wherein the starting material is continuously advanced by pushing.

9. The production method of claim 1 , wherein the alternating magnetic field is coupled-in at a frequency in a range from 10 kHz to 60 MHz.

10. The production method of claim 9 , wherein the alternating magnetic field is coupled-in at a frequency in a range from 100 kHz to 10 MHz.

11. The production method of claim 10 , wherein the alternating magnetic field is coupled-in at a frequency in a range from 100 kHz to 1 MHz.

12. The production method of claim 1 , and comprising the further step of cooling the starting material molded into the molded article.

13. The production method of claim 1 , wherein the starting material is molded into the molded article in a pultrusion process.

14. The production method of claim 13 , wherein the alternating magnetic field is coupled into the starting material upstream of a mold.

15. The production method of claim 1 , wherein the starting material is molded onto an already existing part of the molded article in a tape laying process.

16. The production method of claim 15 , wherein the alternating magnetic field is coupled into the starting material in a region between guide rollers and a cooled pressing tool for the starting material.

17. The production method of claim 1 , wherein the starting material is wound onto an already existing part of the molded article in a winding process.

18. The production method of claim 17 , wherein the alternating magnetic field is coupled into the starting material in a region between a roving guide and a cooled pressing tool for the starting material.

19. The production method of claim 1 , wherein a resin of the resin portion of the starting material is a thermoplastic resin.

20. The production method of claim 19 , wherein the thermoplastic resin is a high-temperature thermoplastic.

21. The production method of claim 20 , wherein the high-temperature thermoplastic is selected from the group of high-temperature thermoplastics that comprises polyether ketones and polyphenylene sulfides.

22. The production method of claim 1 , wherein a resin of the resin portion of the starting material is a thermoset resin.

23. A production method for producing molded articles from fiber composites, the method comprising the steps of:

selecting superparamagnetic particles from a group of superparamagnetic particles which comprise primary particles of single magnetic metal-oxide domains having a diameter in a range from 2 to 100 nm embedded in a non-magnetic matrix, and which become coupled to an external alternating magnetic field;

adding the selected superparamagnetic particles to a resin portion of a strip-shaped starting material comprising the resin portion and reinforcing fibers at a ratio in a range from 0.1 to 50% by weight of the resin portion, wherein the resin portion consists of a high-temperature thermoplastic;

continuously advancing the strip-shaped starting material;

heating the continuously advanced strip-shaped starting material by coupling-in an external alternating magnetic field at a frequency in a range from 10 kHz to 60 MHz, to which the superparamagnetic particles in the resin portion of the starting material become coupled;

continuously molding the heated starting material into a molded article; and

cooling the starting material molded into the molded article to solidify the resin portion in the molded article.

24. A semifinished product for use in producing molded articles from fiber composites, the product being a strip which is elongate in a direction of main extention and comprising reinforcing fibers and a resin portion which includes superparamagnetic particles, wherein the superparamagnetic particles are included in the resin portion in an amount of from 0.1 to 50% by weight, and the superparamagnetic particles comprise primary particles of single magnetic metal-oxide domains having a diameter in a range from 2 to 100 nm.

25. The semifinished product of claim 24 , wherein the primary particles of single magnetic metal-oxide domains of the superparamagnetic particles are covered with a layer of a non-magnetic matrix.

26. The semifinished product of claim 25 , wherein the non-magnetic matrix is selected from the group consisting of a metal-oxide matrix and a metalloid-oxide matrix.

27. The semifinished product of claim 26 , wherein the non-magnetic matrix is the metal-oxide matrix and the metal-oxide of the metal-oxide matrix is selected from the group consisting of oxides of titanium, zirconium, zinc, aluminum, silicon, cerium and tin.

28. The semifinished product of claim 26 , wherein the non-magnetic matrix is the metalloid-oxide matrix and the metalloid-oxide of the metalloid-oxide matrix is silicon dioxide.

29. The semifinished product of claim 24 , wherein the reinforcing fibers run unidirectionally in the direction of main extention of the elongate strip.

30. The semifinished product of claim 24 , wherein the resin portion comprises a thermoplastic resin.

31. The semifinished product of claim 24 , wherein the resin portion comprises a thermoset resin.

32. The semifinished product of claim 30 , wherein the thermoplastic resin is a high-temperature thermoplastic.

33. The semifinished product of claim 32 , wherein the high-temperature thermoplastic is selected from the group of high-temperature thermoplastics that comprises polyether ketones and polyphenylene sulfides.

34. The semifinished product of claim 24 , wherein the primary particles of single magnetic metal-oxide domains have a diameter in a range from 2 nm to less than 50 nm.

35. The semifinished product of claim 24 , wherein the reinforcing fibers are carbon fibers.