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Melt blown fiber structures for use in high strength wicks

a fiber structure and high-strength technology, applied in the direction of yarn, transportation and packaging, printing, etc., can solve the problems of early polyester filament-based attempts to reproduce these properties that were not acceptable, and achieve the effects of improving stiffness and robustness, simple, efficient and inexpensiv

Inactive Publication Date: 2005-07-14
FILTRONA RICHMOND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention provides a method and apparatus for making writing and marking instrument components in a simple, efficient, and inexpensive manner. The components have improved drainback, resistance to highly aggressive ink formulations, and increased stiffness and robustness. The invention also provides melt blown polymeric bicomponent fibers that can be used as a nib, roller ball wick, or ink reservoir in a writing or marking instrument. These components are thermally stable, three-dimensional, porous elements that can store and control the release of ink with minimal drainback. The invention also provides a high capacity ink reservoir for a writing or marking instrument that can be used with various ink formulations and provide effective function over extended periods of use.

Problems solved by technology

Past attempts to produce nibs formed of bonded polyester fiber tows, particularly for use with writing and marking instruments incorporating such aggressive inks, have suffered unacceptable “drainback” properties.
While currently available polyester felt / phenolic nibs satisfy commercial drainback criteria, early polyester filament-based attempts to reproduce these properties failed.

Method used

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  • Melt blown fiber structures for use in high strength wicks
  • Melt blown fiber structures for use in high strength wicks

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Embodiment Construction

[0024] The instant inventive concepts are embodied in a bicomponent, sheath-core, melt blown, fiber as seen schematically, very enlarged, at 20 in FIG. 1 wherein the core 24 is formed of nylon 6,6 and the sheath 22 is formed of polyethylene terephthalate or a copolymer thereof.

[0025] As defined in the '766 patent, the term “bicomponent” as used herein refers to the use of two polymers of different chemical nature placed in discrete portions of a fiber structure. While other forms of bicomponent fibers are possible, the more common techniques produce either “side-by-side” or “sheath-core” relationships between the two polymers. The instant invention is concerned with the production of “sheath-core” bicomponent fibers wherein a sheath of polyethylene terephthalate or a copolymer thereof is spun to completely cover and encompass a core of nylon 6,6 or polybutylene terephthalate, preferably using a “melt blown” fiber process to attenuate the extruded fiber.

[0026] As defined in the '76...

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Abstract

A high strength wick is presented that comprises a self-sustaining fibrous element. This element is formed of a multiplicity of fibers bonded to each other at spaced apart points of contact to define a porous matrix. The fibers are melt blown bicomponent fibers comprising a core of nylon 6,6 and a sheath of a polymer selected from the group consisting of polyethylene terephthalate and copolymers of polyethylene terephthalate. The sheath polymer is selected and adapted for solvent resistance.

Description

[0001] This is a complete application claiming benefit of provisional application Ser. No. 60 / 371,154 filed Apr. 10, 2002.BACKGROUND OF THE INVENTION [0002] 1. Technical Field [0003] The instant invention relates to unique polymeric bicomponent fibers and to the production of wicking devices, especially, nibs and ink reservoirs for writing and marking instruments made from such fibers. More specifically, this invention is directed to the production and use of nibs and ink reservoirs, particularly nibs for writing and marking instruments such as fiber tip pens and “felt tip” markers, as well as roller ball wicks for roller ball pens, wherein the wicking devices are formed of sheath-core, melt blown, bicomponent fibers wherein a core of a nylon 6,6 is substantially fully covered with a sheath of polyethylene terephthalate or a copolymer thereof. For the production of nibs, the core material may be polybutylene terephthalate. [0004] 2. Discussion of the Prior Art [0005] The production ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B43K8/02B43K8/08D01F8/12D01F8/14
CPCB43K8/02B43K8/08Y10T428/2933D01F8/14D01F8/12
Inventor WARD, BENNETT C.LONG, ROBERT D.NELSON, DONALD F.NELSON, RAYMOND J.PAYNE, JACKIE F. JR.YANCEY, E. VAUGHAN
Owner FILTRONA RICHMOND
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