Angle is too small
Easy to wear ball seat closing (spherical material for nickel platinum copper or stainless steel, more prone to wear than ball beads), such as long contact with the written object, even if the writing is paper, the ball seat can not withstand wear, so will cause the ball beads to fall off.
Correct angle
When the ballpoint pen is written, the angle control in the 55° to the 70° is the most ideal, at this time, only the ball beads and paper contact (ball is very hard, tungsten carbide or ceramics, very difficult to wear), closing do not touch the writing, so as to ensure that the ballpoint pen in a good state of writing to extend the service life.
Cushion paper too thick When writing, pad paper is too thick, the pen closing contact with paper, easy to wear beads, it is recommended that: 0.4 of the ball can not be rewritten, 0.5 of the ball beads a maximum of 1 copies, should not be more, 0.7 of the ball beads up to 3 to 4, should not be more, rewrite the best 75° writing.