Auxetic filamentary materials
AssigneeAuxetic Technologies Limited
InventorsKim Lesley Alderson, Virginia Ruth Simkins
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Abstract
An auxetic material, which has a negative Poisson ratio so that it has the property of expanding or contracting transversely to a direction in which it is extended or compressed, is made in filamentary or fibrous form. A suitable process involves cohering and extruding heated polymer powder so that the cohesion and extrusion is effected with spinning to produce auxetic filaments. Typically the powder is heated to a temperature sufficient to allow some degree of surface melting yet not high enough to enable bulk melting.
Claims20
An auxetic polymeric material of continuous filamentary or fibrous form produced by a method comprising the steps of cohering and extruding a heated thermoformable particulate polymer material, wherein cohesion and extrusion are effected during spinning to produce continuous filamentary material having auxetic properties, and wherein there is substantially no compaction or sintering of the polymer material prior to spinning of the material.
Dependencies are inferred from the claim text.