F - Mech Eng,Light,Heat,Weapons – 28 – F
Patent
F - Mech Eng,Light,Heat,Weapons
28
F
F28F 21/06 (2006.01)
Patent
CA 2263607
Plastic tube-type heat exchanger structures are made with partially crystallized partially aromatic polyamides of high glass transition temperature. The structures are then annealed to further crystallize the polyamides, causing shrinkage and building up residual tensile stresses. These stresses counteract the swelling caused by water absorption and temperature rise during use of the heat exchanger and keep the structures dimensionally stable.
La présente invention concerne des structures d'échangeur thermique à tubes de plastique fabriqués à partir de polyamides partiellement cristallisés et partiellement aromatiques à haute température de transition vitreuse. Lesdites structures sont ensuite recuites pour provoquer une cristallisation supplémentaire des polyamides, causant ainsi un rétrécissement et la formation de tensions de traction résiduelles. Lesdites tensions contredisent le gonflement provoqué par l'absorption d'eau et l'augmentation de température lors de l'utilisation de l'échangeur thermique et maintiennent ainsi les structures dans un état dimensionnel stable.
Bennett Jones Llp
Du Pont Canada Inc.
E.i. Du Pont de Nemours And Company
LandOfFree
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