Although the neutral ink pen belongs to ball point pen products, its writing principle, pen head structure and t addition_ 32 art is similar to traditional oil ballpoint pen, but due to the difference of ink performance, there are special requirements for the pen head. However, the development of neutral ink is difficult. At present, Japan, the United States, Germany, South Korea and other countries produce neutral ink, and Japan is the best. The key to the development of neutral ink is: the formula of ink; the 32512 art matching the formula; the matching of ink and pen head. In the formulation development, the ink should have proper viscosity, surface tension and pH value, not only ensure the pen is smooth and not leaking, but also ensure the light, water, heat, cold, moisture retention and permeability of the ink. Meanwhile, it is necessary to solve the stability of ink. The ink water is preserved for a long time without deterioration, and does not appear stratification and precipitation, and also ensures the ink safety, non-toxic and corrosion free Sex. In addition to the advantages of oil ballpoint pen and water-based ballpoint pen, the neutral pen should also have the following quality indicators.

     (1) Ink is of high versatility, which can be used in a wider range of strokes to achieve better writing performance, so as to better become a matching product of pen factory.

     (2) The ink should have the corresponding pseudoshrinkage and viscosity poking, and the intermittency of the ink should be long to achieve a longer time of decanting.

     (3) The ink should reach a certain particle fineness, lower than the gap between ball ball and ball socket, and have strong dispersion ability to prevent the pen from blocking the n-direction writing.

     (4) The ink is stable, and can be written normally at a certain room temperature, and the ink is evenly and not layered.

     (5) There is enough writing length, that is, a tube of ink can draw longer lines on the scriber.

     The development mechanism and manufacturing technology of neutral ink are very strict in performance and index. Its development is a comprehensive auxiliary process with complex conditions, strong technology and strong experience. It is necessary to make breakthroughs in the following aspects.