Pencil comprising a marking core and a porous resin sheath

Details Pencil comprising a marking core and a porous resin sheath Pencil comprising a marking core and a porous resin sheath

1974-10-29

1976-11-23

Lieberman, Allan

Coating implements with material supply

Solid material for rubbing contact or support therefor

Including holder

260 174BB, 260 174CL, B43K 1914

Patent

active

039934080

ABSTRACT:
Pencils made with a resin-based sheath to replace wood sheaths. A sheath material consisting essentially of a resin binder, a fibrous filler and a metallic soap is extruded around a marking core. The resulting extrudate is immediately chilled after leaving the die, and cut into pencil lengths. The apparatus includes core feeding and transport means, core preheating means and chilling means. The resulting pencils possess the physical qualities associated with wood-sheathed pencils due to the fine, closed cell structure of the sheath material. The surface of the sheath is smooth and may be coated with a pigmented resin or painted.

REFERENCES:
patent: 1937104 (1933-11-01), Thomsen
patent: 2408398 (1946-10-01), Johnson
patent: 2790202 (1957-04-01), Lorenian
patent: 2988784 (1961-06-01), Lorenian
patent: 3704071 (1972-11-01), Muller et al.

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