The ballpoint pen is also called a ballpoint pen. It has the advantages of simple structure, convenient carrying, writing lubrication, and is suitable for rewriting. Therefore, people from all walks of life, such as school students and office workers, are happy to use.
The writing principle of the ballpoint pen mainly uses the ball to directly contact the paper surface during writing to generate friction, so that the ball rolls in the ball seat and brings out the ink or ink in the pen core to achieve the purpose of writing. According to the material and structure used in the ballpoint pen parts, it can be divided into advanced, intermediate, and ordinary ballpoint pens. The metal parts of the metal rod or the ball-point pen with the metal refill are treated with high-grade products; the plastic refill and the plastic pen holder and the pen holder are simple in structure; the intermediate product is between the two. .
To pick a good ballpoint pen, pay attention to the following points:
1, appearance
The ballpoint pen tip is full and smooth, no deformation, no stains, and the pen tie is moderately tight, and can not be strung with the refill. When the diameter of the pen tip is less than or equal to 2.5 mm, the length of the pen core exposed portion of the pen should be less than 2 mm; if the diameter of the pen tip is greater than 2.5 mm, the length of the pen cap exposed portion of the pen should be greater than 3 mm. Whether the brush cap is smooth when the cap is pulled, and whether other parts of the ballpoint pen are blocked by friction. If the ballpoint pen is pressed, the push and reset transitions are flexible, and the ball is not exposed when reset.
2, writing
The size of the ball diameter determines the thickness of the line of the handwriting. Common ball diameters range from 0.5 to 1.0 mm (often on the pen or ball refill of the product). The ink of the ballpoint pen is specially made, mainly composed of a mixture of coloring materials, solvents and viscosity modifiers. Good inks have the advantages of light fastness, water resistance and non-permeability. Draw a circle test on paper, write fluently, strokes are even, the color is uniform, and there is no disconnection of pockmarks.
3, feel
Generally, the ballpoint pens are designed with rubber sleeves or embossing on the pen, one is to increase the friction between the hand and the ballpoint pen, and the other is to prevent the fingers from deforming when the fingers are written for a long time. Feel comfortable, long time writing without fatigue is a good ballpoint pen.
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