Ball pen 3D model

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Ball pen A ballpoint pen is a kind of pen (pen), when writing, ink is transferred from the tank to the paper with a rotating ball. Consists of a rod (plastic tube) filled with pasty ink, and a ball writing tip located at the end of the rod. The tip consists of a tube (copper, nickel silver, steel, etc.), one end entering the rod, and a small metal ball, placed with a small gap at the other end of the tube so that one of its end protrudes from the tube. To achieve wear resistance, the balls are made of a solid material, for example, steel or tungsten carbide, and the spherical shape is achieved by grinding using a diamond paste or other methods. Due to the spherical shape and the gap between the ball and the tip tube, the ball can rotate. Ink from the rod through the tube of the tip comes to the ball and moistens one side of it. When writing, the ball rotates due to friction between the paper and the ball, the inked side of the ball is outside the tube, and the ink from the ball is transferred to the paper. The viscosity and density of the ink should be such that the ink does not flow out (thick) from the rod either from the open end or through the gap between the tube and the ball, stick to the last and are transferred to the paper, besides, the ink must dry quickly enough on paper, so pen ink is not suitable for ballpoint pens. Ink for ballpoint pens (ink paste) are created on an oil base with the addition of pigments or colorants to give them different colors. Due to the simplicity of construction, the ball pens are cheap and widely distributed.