Honeycomb having a low coefficient of thermal expansion and...

Details Honeycomb having a low coefficient of thermal expansion and... Honeycomb having a low coefficient of thermal expansion and...

D - Textiles, Paper

21

H

D21H 13/00 (2006.01) B31D 3/02 (2006.01) D21H 27/00 (2006.01)

Patent

CA 2669985

This invention relates to a honeycomb and articles made therefrom, the articles having cell walls provided with a structural or matrix resin, the planes of the cell walls being parallel to the Z-dimension of the honeycomb, the honeycomb cell walls comprising 5 to 35 parts by weight thermoplastic material having a melting point of from 120°C to 350°C and a coefficient of thermal expansion of 180 ppm/°C or less; and 65 to 95 parts by weight of a high modulus fiber having a modulus of 525 grams per denier (480 grams per dtex) or greater and having an axial coefficient of thermal expansion of 2 ppm/°C or less, based on the total amount of thermoplastic and high modulus fiber in the honeycomb cell walls; wherein the honeycomb has a coefficient of thermal expansion in the Z-dimension of 10 ppm/°C or less as measured by ASTM E831.

L'invention concerne un nid d'abeilles et des articles fabriqués à partir de celui-ci, les articles ayant des parois cellulaires pourvues d'une résine structurelle ou de matrice, les plans des parois cellulaires étant parallèles à la dimension Z du nid d'abeilles, les parois cellulaires du nid d'abeilles comportant 5 à 35 parties en poids d'un matériau thermoplastique ayant un point de fusion de 120 °C à 350 °C et un coefficient de dilatation thermique de 180 ppm/°C ou moins ; et 65 à 95 parties en poids d'une fibre de module élevé ayant un module d'au moins 525 grammes par denier (480 grammes par dtex) et ayant un coefficient axial de dilatation thermique de 2 ppm/°C ou moins, par rapport à la quantité totale de fibres thermoplastiques et de module élevé dans les parois cellulaires du nid d'abeilles. Le nid d'abeilles de l'invention a un coefficient de dilatation thermique dans la dimension Z de 10 ppm/°C ou moins tel que mesuré par la norme ASTM E831.

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