A pre-form and a method of preparing pre-forms are provided. The pre-forms comprise a resin and at least two layers of oriented fiber tows. The pre-forms comprise fiber tows instead of the traditional prepregs to enhance rearranging of resin and/or fibers during subsequent processing as well as prov
A pre-form and a method of preparing pre-forms are provided. The pre-forms comprise a resin and at least two layers of oriented fiber tows. The pre-forms comprise fiber tows instead of the traditional prepregs to enhance rearranging of resin and/or fibers during subsequent processing as well as provide greater freedom, a price reduction and/or a reduction of waste. The pre-forms may be formed three-dimensionally to enhance coupling to further pre-forms or other structures and/or to enhance shaping of the pre-form to a final three-dimensional shape. The method of preparation of pre-forms involves providing an adhesive between layers of fibers and providing a resin in contact with at least one of the layers of fibers. The resin is preferably provided in a non-continuous layer to allow for removal of gas at least partially in a direction orthogonal to the layers of resin. The pre-forms are suitable for preparation of composite structures like for example spars for wind turbine blades.
대표청구항▼
1. A pre-form comprising a resin, an adhesive, and at least three layers of fibres, wherein: a plurality of said layers of fibres consist exclusively of unidirectionally oriented, continuous fibre tows,the resin is consisting essentially of a thermosetting material and contains no thermoplastic mate
1. A pre-form comprising a resin, an adhesive, and at least three layers of fibres, wherein: a plurality of said layers of fibres consist exclusively of unidirectionally oriented, continuous fibre tows,the resin is consisting essentially of a thermosetting material and contains no thermoplastic materials,the adhesive is applied in a non-continuous layer between adjacent layers of fibres to at least partially immobilize the fibres and to define a plurality of gas escape pathways having pathway outlets directed in at least two orthogonal directions, the at least two orthogonal directions being transverse to the longitudinal orientation of the fibre tows such that the at least two orthogonal directions include a primary orthogonal direction oriented through a thickness defined by the plurality of said layers of fibres in combination and a secondary orthogonal direction oriented parallel to the plurality of said layers of fibres, and such that the gas escape pathways promote gas escape during curing or pre-curing of the resin and adhesive in the at least two orthogonal directions through the pathway outlets, anda part of said pre-form being formed three-dimensionally so that said part of said pre-form is tapered. 2. The pre-form of claim 1, wherein the fibres are continuous fibres. 3. The pre-form of claim 1, wherein the resin is mainly an epoxy-based resin or a polyester-based resin. 4. The pre-form of claim 3, wherein the resin comprises two resin systems. 5. The pre-form of claim 1, wherein the pre-form is substantially rectangular in shape as observed in plan view from above. 6. The pre-form of claim 5, wherein the rectangular shape of said pre-form defines a distance between parallel sides of the rectangular shape that is between at least 3 times and 6times the length of any of the parallel sides. 7. The pre-form of claim 1, wherein the pre-form is substantially trapezoidal in shape when in plan view as viewed from above. 8. The pre-form of claim 7, wherein the trapezoidal shape of said pre-form trapezoid has at least two interior angles (α,β) which are substantially the same. 9. The pre-form of claim 1, wherein the pre-form is substantially quadrangular or triangular in shape in plan view as observed from above. 10. The pre-form of claim 1, wherein the fibres are oriented substantially orthogonally to an edge of the pre-form. 11. The pre-form of claim 1, wherein the fibres are oriented substantially parallel to an edge of the pre-form. 12. The pre-form of claim 1, wherein fibres are oriented to strengthen areas of the final element which will be exposed to higher stress during service. 13. The pre-form of claim 1, wherein orientation of fibres is substantially the same in all layers. 14. The pre-form of claim 1, wherein orientation of fibres in a first layer is different from the orientation of fibres in a second layer. 15. The pre-form of claim 1, wherein a part of said pre-form is tapered along a connection surface defined by terminal ends of said layers of fibres that comprise first type fibres,wherein said layers of fibers in the pre-form comprise said first type fibres and second type fibres provided in layers having an appreciable amount of, or exclusively containing said second type fibres interlaced between layers having an appreciable amount of, or exclusively containing said first type fibres, the layers containing second type fibres being separated from one another by the layers containing first type fibres, the second type fibres extending beyond said connection surface of the pre-form, andwherein said second type fibres do not contain the same fibre material as the first type fibres such that the pre-form is enhanced for coupling at the connection surface to a composite member comprising the second type fibres and a resin, said second type fibres positioned to extend into said pre-form on one side of said connection surface and extend into the composite member comprising said second type fibres on another side of said connection surface. 16. The pre-form of claim 15, wherein the first type fibres include carbon fibres, the second type fibres are not carbon fibres, and the second type fibres are selected from the group of glass fibres, aramid-fibres, synthetic fibres, bio fibres, mineral fibres, metal fibres or boron fibres. 17. A pre-form comprising a resin, an adhesive, and at least three layers of fibres, wherein: a plurality of said layers of fibres include continuous oriented fibre tows defining a lengthwise orientation, andthe adhesive is applied in a pattern between adjacent layers of fibres to at least partially immobilize the fibres and to define an adhesive layer between the adjacent layers of fibres, the adhesive layer including a plurality of gas escape pathways having pathway outlets directed in an orthogonal direction, the orthogonal direction being transverse to the lengthwise orientation of the fibre tows and within the adhesive layer, such that the gas escape pathways promote gas escape during curing or pre-curing of the resin and adhesive in the orthogonal direction through the pathway outlets without requiring the gas to move through the adjacent layers of fibers to escape. 18. The pre-form of claim 17, wherein the fibres of each layer are oriented primarily unidirectionally, respectively. 19. The pre-form of claim 17 , wherein the adhesive forms a non-continuous layer between adjacent layers of fibres. 20. The pre-form of claim 17 , wherein the resin consists essentially of a thermosetting material and contains no thermoplastic materials.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (8)
Salzstein Richard A. (Wilmington DE) Toombes Guy R. (Salt Lake City UT), Composite femoral implant having increased neck strength.
White Warren D. (Lake Jackson TX) Cook Phil H. (Cheshire CT) Wai Martin (Cheshire CT) Davis William (Lake Jackson TX), Process for resin transfer molding and preform used in the process.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.