Method of manufacturing synthetic resin pen nibs

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

1984-06-25

1986-07-01

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

Forming continuous work followed by cutting

264557, 264562, 264150, 264159, 2642095, 2642104, 2642356, 2642888, 264346, B29C 4790

Patent

active

045979324

ABSTRACT:
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 thermoplastic 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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