Continuous process of manufacturing polymeric composition writing points and devices
Abstract
Abstract Relates to a method of manufacturing homogeneous, unitary writing elements in continuous manner whereby the structural and physical properties of a synthetic thermoplastic polymer (or-copolymer) can be utilized at best advantage. The methods herein disclosed are particularly directed to the production of writing elements having a gross cross-sectional area not appreciably greater than 32,000 square mils, such elements having a plurality of minute ink-conveying channels distributed within a circumaxial area no appreciably exceeding one-fourth of the gross cross-sectional area of the element the aggregate cross-sectional area of the channels being less than about 4% of the gross area of the element. The method utilizes and discloses steps and conditions of extruding and melt-drawing a polymer and then reforming the internal portions of the extruded body by a compressive drawing operation, under stated conditions, to obtain channels of desired size. As a further step the extruded article may be stabilized and relieved of internal stresses by annealing.
Inventors
- 👤 D Woolley
Bibliographic Details
Claims Analysis
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| 3.5 Years (Year 4) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
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