The object the present invention is to provide an exterior molding body for automobile which is reinforced by a long fiber, is excellent in mechanical properties such as bending elastic modulus and bending strength, chemical resistance and heat resistance, is lightened, has high designability and is reduced in the anisotropy of linear expansion coefficient of molding body caused by the fiber orientation at filling thereof to a mold. In an aspect of the present invention, there is provided an exterior molding body comprising a long fiber reinforced thermoplastic resin having such properties that: the content of long fiber dispersed in the molding body is 30 to 90% by weight, the average fiber length of long fiber is 1.5 to 10 mm, the maximum project area of said molding body is not less than 20000 mm 2 , the molding body has such a shape that the length of narrow resin flow path at the portion having not more than 100 mm 2 of cross sectional area in the mold cavity at the molding is not more than 150 mm, the maximum linear expansion coefficient at a portion of said molding body having a wall thickness of not less than 2 mm is not more than 5 X 10 -5 K -1 and the ratio of maximum linear expansion coefficient/minimum linear expansion coefficient is not more than 1.8.
Process for producing an exterior body comprising long fiber reinforced thermoplastic resin
Verfahren zur Herstellung eines Aussenformkörpers aus langfaserverstärktem thermoplastischem Harz
Procédé de fabrication d'un corps extérieur comportant une résine thermoplastique renforcée par des fibres longues
2017-01-11
Patent
Electronic Resource
English
IPC: | B29C Formen oder Verbinden von Kunststoffen , SHAPING OR JOINING OF PLASTICS / B29K Index-Schema für Formmassen oder Materialien für Verstärkungen, Füllstoffe oder vorgeformte Teile, z.B. Einlagen in Verbindung mit den Unterklassen B29B, B29C oder B29D , INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS / B29L INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES , Index-Schema für besondere Gegenstände in Verbindung mit Unterklasse B29C / B62D MOTOR VEHICLES , Motorfahrzeuge |
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