Method of manufacturing synthetic resin pen nibs

Details Method of manufacturing synthetic resin pen nibs Method of manufacturing synthetic resin pen nibs

B - Operations, Transporting

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B29D 99/00 (2010.01) B29C 47/00 (2006.01) B29C 55/06 (2006.01) B29C 71/00 (2006.01) B43K 1/00 (2006.01) B29C 71/02 (2006.01)

Patent

CA 1230713

Abstract of the Disclosure Method of manufacturing synthetic resin pen nibs is disclosed, which pen nibs may suitably be employed in writing instruments for fine lettering or drawing fine lines. The pen nibs are formed of thermo- plastic crystalline synthetic resin, e.g. polyethylene terephthalate resin, which is extruded from a molding die and subjected to rapid cooling to form a continuous rod in amorphous state. The rod is axially stretched under predetermined temperature condition to achieve oriented crystallization of the resin molecules, and is further heat-treated such that non-oriented fine crystals are dispersed and grown between oriented crystals and remaining amorphous regions. Pen nib thus obtained has highly improved physical and chemical properties.

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