Writing implement refill and writing implement

摘要

A writing implement that prevents flow of air into an ink tank and prevents writing failure while allowing for productivity. The writing implement includes a writing implement refill having: an ink tank composed of films storing ink; a joint connected to a tip of the ink tank; and a writing tip connected to a tip of the joint. An inner circumferential surface of the tip of the ink tank covers an outer circumferential surface of a rear end of the joint. A covering member of a ring shape covers from outside an area where the tip of the ink tank covers the outer circumferential surface of the rear end of the joint.

主权项

1. A writing implement refill comprising:
a flexible ink tank storing ink, the flexible ink tank including two flexible films whose peripheries are welded together at their rear ends and at opposite side ends, and having an opening at a tip of the flexible ink tank; a ballpoint pen tip connected to the tip of the flexible ink tank, the ballpoint pen tip including a holder and a writing ball held at a tip of the holder, wherein an outer circumferential surface of a rear end of the holder is covered with an inner circumferential surface of the tip of the flexible ink tank, and a covering member covering over an area where the tip of the flexible ink tank covers the outer circumferential surface of the rear end of the holder.