Fiber-bundled part for writing instruments, and pen tip and writing instrument using the fiber-bundled part
AssigneeMitsubishi Pencil Company, Limited
InventorsToshihiro Takahashi, Toshimi Kamitani, Hirotake Izawa
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Abstract
This application is related to a fiber-bundled part for writing instruments having excellent strength and durability, as well as a pen tip and a writing instrument using the fiber-bundled part, which can be suitably used for pen tips, ink feed cores and relay cores of writing instruments such as marking pens and felt-tip pens. The fiber-bundled part for writing instruments of the present disclosure is used for the ink feed core leading to the pen tip or a writing pen core, and comprises a multifilament of long fibers having different melting points, and the multifilament at least contain crimped fibers.
Claims7
A fiber-bundled part for writing instruments used for an ink feed core leading to a pen tip or a writing pen core, comprising:
- a multifilament of long fibers having different melting points, the multifilament at least containing crimped fibers,
- wherein a crimp ratio of the crimped fibers that is determined by a following formula (I) falls within a range from 1 to 50%,
- the crimp ratio=(a crimp width/a crimp length)×100 (I)
- wherein in the formula (I), a distance between a wave crest to a next wave crest in the fiber is defined as a crimp length, and a distance between the wave crest and a trough of a wave in a direction perpendicular to the crimp length is defined as a crimp width.
Dependencies are inferred from the claim text.