GB1225998A - - Google Patents

Abstract

1,225,998. Felt nib pens. DART INDUSTRIES Inc. 26 June, 1968 [26 June, 1967], No. 30492/68. Heading A4K. In the production of a reservoir for a marker pen, a deregistered crimped filamentary tow is laterally compressed, while a sheath of plastics material is formed around it. The compressed tow may be wrapped in a plastics strip, which is subsequently heat sealed. As shown, molten polypropylene, polyethylene or p.v.c. is extruded around the compressed tow 46, which may be of polyester or cellulose acetate. Uncrimped threads or yarns 80 are provided to bear almost all the tension exerted to draw the tow 46 through the apparatus. The tension may be applied by drive rollers arranged in a cutting machine (62, Fig. 9, not shown) for dividing the sheathed tow into reservoir lengths. On cutting, the ends of the tow remain flush with the end of the sheath. On omitting the threads 80 the centre part of the tow recedes inwardly (Fig. 8, not shown). An air vent, in the form of a longitudinal groove (44), is provided in the outer wall of the reservoir by a pointed nib (79, Fig. 12 not shown). In a pen construction (Fig. 1, not shown) the inner end of a porous nib (24) lies between a pair of arms (34), which are joined to form a piercing point (35), to facilitating insertion of the nib into the fibrous material of the reservoir.