Why do ballpoint pens and gel pens always drop beads?

We know that the pen is also called fountain pen because the pen water itself is made of tap water and water-soluble toner, so the pen is a water-based pen, and the liquid in the refill of a ballpoint pen is oily. Therefore, the liquid in the gel pen is an organic solvent, which is different from the pen water and the oily liquid in the ballpoint pen core. Its viscosity is lower than that of oily pen ink and thicker than that of water-based pen ink. When writing, the ink will change from semi-solid to liquid ink after passing through the nib. The biggest advantage of gel pen ink is that every drop of ink is used on the tip of the pen, which will not volatilize and leak, so it can provide a silky and smooth writing feeling, and the ink flow is smooth and stable. Gel pen originated in Japan. 1988, PENTEL Co., Ltd. of Japan successfully developed a product called "Hybrid", and the gel pen was born. Because gel pens have the advantages of fountain pens and ballpoint pens, and they are comfortable to write, they are very popular with people. It has developed rapidly in recent years and is likely to replace ballpoint pens. Well-known gel pen manufacturers in China include: Guangzhou True Color, Qingdao Snowflake, Yiwu Chenyang Pen, and Chen Guang, a Sino-Korean joint venture. . . etc