Process for producing the drawn molded article of a fluoroplastic
AssigneeNippon Mitsubishi Oil Corporation
InventorsTetsuo Kanamoto, Ryoukei Endo, Hiroki Uehara
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Abstract
A process for producing a fluoroplastic drawn molded article is disclosed in which a fluoroplastic molded article is brought into contact with a heating medium set at a temperature exceeding the static melting point of the molded article and drawn at a temperature at which the molded article does not substantially melt. The fluoroplastic drawn molded article produced in accordance with the present invention is significantlly improved in physical properties such as tensile strength and tensile modulus.
Claims9
A process for producing a drawn molded article of a fluoroplastic, comprising the steps of:
- (A) solid-state extruding or solid-state rolling said fluoroplastic at a temperature at which said fluoroplastic does not substantially melt at an extruding ratio of 2-fold to 100-fold or a rolling ratio of 1.2-fold to 30-fold;
- (B) bringing the molded article into contact with a heating medium set at a temperature exceeding a static melting point of said molded article;
- and
- (C) drawing said contacted molded article at a temperature at which said molded article does not substantially melt at an extension ratio of 3-fold to 150-fold, such that said fluoroplastic is extended at a total extruding or rolling ratio and drawing ratio of at least 100-fold.
A process for producing a drawn molded article of a fluoroplastic comprising the steps of:
- (D) solid-state extruding or solid-state rolling said fluoroplastic at a temperature which causes a static melting point of said molded article to be greater than a melting point of said fluoroplastic at an extruding ratio of 2-fold to 100-fold or a rolling ratio of 1.2-fold to 30-fold;
- (E) bringing the molded article into contact with a heating medium set at a temperature exceeding said static melting point of said molded article;
- and
- (F) drawing said contacted molded article until melting of said molded article begins to occur such that said molded article does not substantially melt at an extension ratio of 3-fold to 150-fold, such that said fluoroplastic is extended at a total extruding or rolling ratio and drawing ratio of at least 100-fold.
Dependencies are inferred from the claim text.