A method for manufacturing a ball pen tip in which a spring for biasing a ball is assembled to the ball pen tip, the method including punching the ball pen tip by a punch from a rear end of the ball pen tip along a central axis direction of the ball pen tip to form a plastic flow ridge formed by a plastic flow upheaving radially inward from an inner peripheral wall surface of the ball pen tip to assemble the spring to the ball pen tip by the plastic flow ridge.

A refill for a writing tool includes an ink containing tube that is made from a resin material and formed in a straight cylindrical shape, and a writing tip that is attached to an end of the ink containing tube. A press-fit portion, formed at the end of the ink containing tube, has a thickness being made thickened toward an inner circumferential surface and has an opening hole penetrating in an axial direction at a central portion of the press-fit portion. The writing tip or a relay member supporting the writing tip is press-fitted and attached to the press-fit portion. The refill for a writing tool can ensure a necessary and sufficient amount of ink stored without expanding an outer diameter of the ink containing tube, and sufficiently secure mechanical strength of an end portion, and a writing tool using the same can be provided.

A refill for a writing tool includes an ink containing tube that is made from a resin material and formed in a straight cylindrical shape, and a writing tip that is attached to an end of the ink containing tube. A press-fit portion, formed at the end of the ink containing tube, has a thickness being made thickened toward an inner circumferential surface and has an opening hole penetrating in an axial direction at a central portion of the press-fit portion. The writing tip or a relay member supporting the writing tip is press-fitted and attached to the press-fit portion. The refill for a writing tool can ensure a necessary and sufficient amount of ink stored without expanding an outer diameter of the ink containing tube, and sufficiently secure mechanical strength of an end portion, and a writing tool using the same can be provided.

A refill for a writing tool includes an ink containing tube that is made from a resin material and formed in a straight cylindrical shape, and a writing tip that is attached to an end of the ink containing tube. A press-fit portion, formed at the end of the ink containing tube, has a thickness being made thickened toward an inner circumferential surface and has an opening hole penetrating in an axial direction at a central portion of the press-fit portion. The writing tip or a relay member supporting the writing tip is press-fitted and attached to the press-fit portion. The refill for a writing tool can ensure a necessary and sufficient amount of ink stored without expanding an outer diameter of the ink containing tube, and sufficiently secure mechanical strength of an end portion, and a writing tool using the same can be provided.

A method produces an applicator for applying liquid or pasty media (1), having a container (3) storing the medium (1), and an application element (5, 13) attached to the container (3) in a usage position such that the application element provides the medium (1) for application outside the container (3) by capillary action. A hose of thermoplastic plastic is extruded and inserted into a mold, forming a container (3) closed at the bottom by expanding the hose in the mold. The container (3) located in the mold is filled with the medium (1). The container (3) is separated from the hose to form an opening accessible at the top side of the container (3). The application element (5, 13) is put into the usage position by inserting the application element through the opening of the hose and fastening the application element (5, 13) while simultaneously creating a closure of the container (3) by moving movable mold parts of the mold.

A method produces an applicator for applying liquid or pasty media (1), having a container (3) storing the medium (1), and an application element (5, 13) attached to the container (3) in a usage position such that the application element provides the medium (1) for application outside the container (3) by capillary action. A hose of thermoplastic plastic is extruded and inserted into a mold, forming a container (3) closed at the bottom by expanding the hose in the mold. The container (3) located in the mold is filled with the medium (1). The container (3) is separated from the hose to form an opening accessible at the top side of the container (3). The application element (5, 13) is put into the usage position by inserting the application element through the opening of the hose and fastening the application element (5, 13) while simultaneously creating a closure of the container (3) by moving movable mold parts of the mold.