Precautions For Using Ballpoint Pens

Angle too small

The closure of the easily worn ball socket (made of nickel, platinum, copper, or stainless steel, which is much easier to wear than the ball bead), if it comes into contact with the object being written for a long time, even if the object being written is paper, the ball socket cannot withstand wear, which can cause the ball bead to fall off.

Correct angle

When writing with a ballpoint pen, an angle control of 55 ° to 70 ° is the most ideal. At this point, only the ball contacts the paper (the ball is hard, tungsten carbide or ceramic, and is not easily worn), and the closing point does not contact the writing object, thereby ensuring that the ballpoint pen can extend its lifespan in good writing condition.

The pad paper is too thick

When writing, the pad paper is too thick, and the tip of the pen comes into contact with the paper, which can easily wear and tear off the beads. It is recommended that 0.4 beads cannot be copied; A maximum of 1 copy of a 0.5 ball bead should not be repeated; A maximum of 3 to 4 copies of a 0.7 ball should be copied, and no more should be used. It is best to write at 75 ° when copying.

dyestuff

The function of dyes is to give sufficient color depth to the ink. The dyes used in ballpoint pen ink can be divided into oil soluble dyes and alcohol soluble dyes. The dyes used in this experiment are phthalocyanine dyes, which are insoluble in solvents and have good dispersibility in the ink. They have strong adhesion to the film forming agent and therefore do not penetrate into the interior of the paper. The colors should be bright and have good weather resistance.

dispersant

An appropriate amount of dispersant can reduce the adhesion between the ink and the surface of the paper, making the ink erasable for a certain period of time when written on the surface of the paper. Dispersants can also maintain the fluency and long-term stability of the ink. The substance used in this experiment is a mixture of phthalates and ethylene glycol esters prepared in a certain proportion.

Film-forming agent

Film forming agent is an important component of erasable ballpoint pen ink, and its main function is to evenly form a film on the surface of the paper and serve as a carrier for dyes. It is required to have a certain degree of adhesion to the paper and not easily peel off, but can be gently wiped off with an eraser. It has strong adhesion to colorants, good solubility in solvents, and is stable with other components, and can be stored for a long time. In this experiment, rubber based film forming agents were used.

solvent

In erasable ballpoint pen inks, the role of solvents is to dissolve dyes, film-forming agents, and dissolve with various additives, providing a certain degree of fluidity, and also having appropriate volatility, effectively controlling the drying rate during the writing process. The experiment shows that using a co solvent is more effective than using a single solvent. In this experiment, a co solvent system with solvent A: solvent B=1:1.5-2.5 was used, and the best effect was achieved.