B - Operations – Transporting – 29 – B
Patent
B - Operations, Transporting
29
B
18/508
B29B 9/12 (2006.01) B29C 67/00 (2006.01) G02B 26/02 (2006.01) G09F 9/37 (2006.01) H01F 1/113 (2006.01)
Patent
CA 1317425
ABSTRACT OF THE DISCLOSURE A particle display comprises a plurality of particles which in an electrical field rotate to expose either their white or black surface depending upon the polarity of the field. The particles of the display are generally spherical and composed of first and second substantially hemispherical portions of two distinct colours. The first hemispherical portion includes a material which imparts predetermined electrical property thereto, which is different from the electrical properties of the second portion. The process for making these particles comprises adding to a heated liquid bath, non-spherical particles consisting of a first layer of plastic, having a first colour and the predetermined electrical property and the second layer of plastic, having a second colour and its respective electrical property. The non-spherical particles are formed by extruding the first and second layers of plastic in the shape of an elongate rod, having the first and second layers adjoining one another centrally of and along the rod. The rod is cut into predetermined lengths, where the resulting aspect ratio of fiber length to diameter, is in the range of 0.5 up to 5. The bath is at a temperature which is sufficient to cause melting of the first and second layers of plastic and anti-agglomerating agent is added to the bath to preclude the non-spherical particles of plastic adhering to one another. The non- spherical particles are allowed to melt in the bath to form spheres. The spheres are solidified in the bath and removed from the bath for use in the particle display.
537670
Ortech Corporation
Sim & Mcburney
LandOfFree
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