摘要:
Methods are provided for producing preform materials for impact-resistant composite materials suitable for liquid molding. An interlayer (6) comprising a spunbonded, spunlaced, or mesh fabric is introduced between non-crimped layers (2) of unidirectional reinforcing fibers to produce a preform for use in liquid-molding processes to produce composite materials. Interlayer material remains as a separate phase from matrix resin after infusion, and curing of the preform provides increased impact resistance by increasing the amount of energy required to propagate localized fractures due to impact. Constructions having the interlayer materials melt-bonded to the reinforcing fibers demonstrate improved mechanical performance through improved fiber alignment compared to other fabrication and preforming methods.
摘要:
A stent graft (18) for transluminal implantation includes a resilient tubular interbraided latticework (34) metal or polymeric monofilaments, a tubular interbraided sleeve (40) of polymeric multifilament yarns, and an adhesive layer (44) between the sleeve (40) and latticework (34) for bonding them together including processes for fabricating the stent graft (18).
摘要:
A method for producing an object by melting a polymer powder in a powder sintering device. The present invention concerns a method for producing an object by melting a polymer powder in a powder sintering device under a laser beam, implementing a rheological analysis of the polymers, in order to determine the conditions for producing the object by melting polymer powders.
摘要:
The invention relates to a method for laying up a strip (110) of fibres containing a thermoplastic polymer and for consolidating during laying of a component thus laid up, said method involving the steps consisting in: a. pre-consolidating a strip (115) through the pultrusion (120) of rovings (110) that have been pre-impregnated with a thermoplastic polymer through a die; b. storing said pre-consolidated strip in the form of a semifinished product; c. laying up said semifinished product on a ply (117) of the same kind, previously laid on a form (150) while pressing (165) said semifinished product (115) onto said ply (117) and heating the interface between the semifinished product and the ply (117) already laid to a temperature T capable of causing the semifinished product (115) to weld to said ply (117).
摘要:
A stent graft (18) for transluminal implantation includes a resilient tubular interbraided latticework (34) metal or polymeric monofilaments, a tubular interbraided sleeve (40) of polymeric multifilament yarns, and an adhesive layer (44) between the sleeve (40) and latticework (34) for bonding them together including processes for fabricating the stent graft (18).
摘要:
The invention relates to a method for bonding a thermoplastic polymer to a thermosetting polymer component, the thermoplastic polymer having a melting temperature that exceeds the curing temperature of the thermosetting polymer. The method comprises the steps of providing a cured thermosetting polymer component comprising an implant of a thermoplastic polymer at least at the part of the thermosetting polymer component to be bonded, locating a thermoplastic polymer in contact with at least the part to be bonded, heating the assembly to the melting temperature of the thermoplastic polymer, whereby the thermoplastic polymer of the implant melts and fuses with the thermoplastic polymer, and cooling the assembly. The thermoplastic polymer has a melting temperature that exceeds the curing temperature of the thermosetting polymer, and the implant is designed such that heating above the maximum operating temperature of the thermosetting polymer at the interface of the implant with the thermosetting polymer component is avoided during the bonding step.
摘要:
A stent graft (18) for transluminal implantation includes a resilient tubular interbraided latticework (34) metal or polymeric monofilaments, a tubular interbraided sleeve (40) of polymeric multifilament yarns, and an adhesive layer (44) between the sleeve (40) and latticework (34) for bonding them together including processes for fabricating the stent graft (18).
摘要:
A stent graft (18) for transluminal implantation includes a resilient tubular interbraided latticework (34) metal or polymeric monofilaments, a tubular interbraided sleeve (40) of polymeric multifilament yarns, and an adhesive layer (44) between the sleeve (40) and latticework (34) for bonding them together including processes for fabricating the stent graft (18).