Although neutral ink pens belong to the same category of ballpoint pens, their writing principles, pen head structure, and processing technology are similar to those of traditional oil-based ballpoint pens. The research and development of neutral ink is more difficult. In the world, Japan, the United States, Germany, South Korea and other countries produce neutral ink, and Japan is the best. The key to the research and development of neutral ink is: the formula of the ink; the processing technology matching the formula; the matching of the ink and the pen head.
First of all, in the development of the formula, it is necessary to make the ink have appropriate viscosity, surface tension, pH value, not only to ensure that the pen is smooth and not leaking, but also to ensure that the ink is light-resistant, water-resistant, heat-resistant, cold-resistant, moisturizing, and permeability. To solve the stability of the ink, the ink will not deteriorate after a long time of storage, and there will be no delamination and precipitation. It is also necessary to ensure the safety of the ink, non-toxic and non-corrosive.
