Three-dimensionally shaped articles and process for producing the same
Process for producing a three-dimensionally shaped article, comprising the steps a) providing a structure containing a plurality of consolidated films or tapes of uni-directionally oriented polymer, b) forming the structure into a three-dimensionally shaped article by applying a force at a temperature below the melting point of the oriented polymer.
1. A process for producing a three-dimensionally shaped article, comprising the steps:
a) providing a consolidated structure containing a consolidated plurality of mono-layers or of bi-layered structures, wherein the mono-layers or bi-layered structures contain polymeric fibers and/or polymeric tapes, wherein the consolidated plurality of mono-layers or consolidated plurality of bi-layered structures contains at least 4 monolayers or bi-layered structures, and wherein the polymeric fibers and/or tapes are woven in a mono-layer; and
b) forming the consolidated structure into a three-dimensionally shaped article by folding or bending the consolidated structure so as to apply a force to the consolidated structure at a temperature below the melting point of the polymer contained by the polymeric fibers and/or polymeric tapes.
2. The process according to claim 1 , wherein the polymeric fibers and/or polymeric tapes are formed of an ultrahigh molecular weight polyethylene (UHMwPE).
3. The process according to claim 2 , wherein the mono-layers or bi-layered structures contain polymeric tapes obtained by agglomeration of UHMwPE as a polymer powder into a tape, followed by drawing the tape.
4. The process according to claim 1 , wherein the structure provided in step a) contains less than 10 wt. % of a binder.
5. The process according to claim 4 , wherein the structure provided in step a) contains no binder.
6. The process according to claim 1 , wherein the structure provided in step a) is a flat panel.
7. The process according to claim 1 , wherein the forming step b) is carried out at room temperature.
8. The process according to claim 1 , wherein the forming step b) is a folding step.
9. The process according to claim 1 , wherein the mono-layers or bi-layered structures contain tapes of a unidirectionally oriented polymer.
10. The process according to claim 9 , wherein the unidirectionally oriented polymer is ultrahigh molecular weight polyethylene (UHMwPE).
11. The process according to claim 10 , wherein the structure provided in step a) contains less than 10 wt. % of a binder.
12. The process according to claim 11 , wherein the structure provided in step a) contains no binder.
13. A process for producing a three-dimensionally shaped article, comprising the steps:
a) providing a consolidated structure comprised of at least four mono-layers or bi-layers of consolidated woven ultrahigh molecular weight polyethylene (UHMwPE) tapes; and
b) forming the consolidated structure into a three-dimensionally shaped article by folding or bending the consolidated structure about at least one fold line so as to apply a force to the consolidated structure at a temperature below the melting point of the woven UHMwPE tapes.
14. The process according to claim 13 , wherein the UHMwPE tapes are formed by agglomeration of UHMwPE powder to form a film, and subsequently reducing the thickness of the films to form the tapes.
15. The process according to claim 13 , wherein the UHMwPE tapes of the mono-layer or each layer of the bi-layer are unidirectionally arranged with adjacent tapes overlapping one another.