Abstract: A process for the preparation of thermoplastic auxetic foams comprising the steps of: a) taking conventional thermoplastic foam; b) subjecting said foam to at least one process cycle wherein the foam is biaxially compressed and heated; c) optionally subjecting the foam to at least one process cycle wherein the biaxial compression is removed and the foam mechanically agitated prior to reapplying biaxial compression and heating; d) cooling said foam to a temperature below the softening temperature of said foam; and e) removing said compression and heat.
Type:
Grant
Filed:
November 6, 2006
Date of Patent:
October 2, 2012
Assignee:
Auxetic Technologies Ltd.
Inventors:
Andrew Alderson, Kim Lesley Alderson, Philip John Davies, Gillian Mary Smart
Abstract: An auxetic knitted fabric, comprising an auxetic component knitted from at least a first type of fibre, and a stabilising component knitted from at least a second type of fibre, wherein the first and second fibre types have different mechanical properties.
Type:
Application
Filed:
April 30, 2010
Publication date:
May 24, 2012
Applicants:
AUXETIC TECHNOLOGIES LTD., GLOBAL COMPOSITES GROUP
Inventors:
Subhash Anand, David Skertchly, Andrew Alderson, Kim Alderson
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.
Type:
Grant
Filed:
December 21, 2004
Date of Patent:
July 24, 2007
Assignee:
Auxetic Technologies Ltd.
Inventors:
Kim Lesley Alderson, Virginia Ruth Simkins