writing instrument cap

Abstract

The present invention provides a writing instrument cap that allows powder lubricant to be uniformly applied to the surface of the pen tip sealing member, thereby enabling smooth insertion of the pen tip sealing member into the cap, and ensuring smooth flow and removal of the pen tip sealing member during the assembly process. [Solution] A pen tip sealing member 3 made of an elastic material is inserted into the main body 2. A powder lubricant is applied to the surface of the pen tip sealing member 3. The powder lubricant is silica spherical fine particles 4. The amount of silica spherical fine particles applied per unit area on the surface of the pen tip sealing member is 0.05 μg / mm². 2 ~1.0 μg / mm³ 2 It is within the range.

Claims

1. A cap for a writing instrument, in which a pen tip sealing member made of an elastic material is inserted inside the main body, and a powder lubricant is applied to the surface of the pen tip sealing member, A cap for a writing instrument, characterized in that the aforementioned powder lubricant is silica spherical fine particles.

2. The amount of silica spherical fine particles adhering per unit area of ​​the surface of the pen tip sealing member is 0.05 μg / mm³ ２ ~1.0 μg / mm³ ２ A cap for a writing instrument according to claim 1, within the range of [specified range].

3. The aforementioned pen tip sealing member comprises a pen tip contact portion and an annular support portion that surrounds the outer circumference of the pen tip contact portion and is integrally formed with the pen tip contact portion. The cap of a writing instrument according to claim 1 or 2, wherein a recess is formed inside the annular support portion by the pen tip contact portion, an annular projection is integrally formed at the end of the annular support portion that surrounds the opening of the recess, and the silica spherical fine particles are attached to the top of the annular projection.

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