The water-based ballpoint pen can be said to be the water-based ballpoint pen used in the entire student era of the generation after the 90s. So what do you know about water-based ballpoint pens? Do you know what classification of water-based ballpoint refill models?
     Water-based ballpoint pens are also known as ballpoint pens or ballpoint pens. The pen holder and pen holder of the ball-point pen are made of plastic injection molding. The pen holder is made of stainless steel and is called semi-steel ball-point pen. The pen-and pen holder is made of stainless steel and is called all-steel ball-point pen. The all-plastic type is basically one-time use, that is, the ink is scrapped when it is used up; the semi-steel type and the all-steel type are mostly replaced with a replaceable refill type structure. The pens of the ball pen are divided into two types: shell type and needle tube shape, which are made of copper alloy, stainless steel or engineering plastic. The beads are made of stainless steel, cemented carbide or alumina. The diameter of the middle bead is 0.7 mm and the diameter of the fine bead is 0.5 mm. The water storage form is divided into two types: fiber bundle storage and fiberless bundle storage. The color of the ink is red, blue, black, green, and the like. The ball pen has the characteristics of a pen and an oily ballpoint pen. The writing is smooth and smooth, and the line is even. It is an ideal writing tool.
     In addition to the above classification, the common water-based ballpoint refill models are also classified by the color of the ink and the structure of the pen.
Classified by ink color
(1) Monochrome ballpoint pen: This is the most common ballpoint pen, often in blue, black, red, etc.
(2) Two-color ballpoint pen: generally red and blue.
(3) Three-color ballpoint pens: red, blue and black.
(4) Four-color ballpoint pens: red, blue, black and green. In addition to these four, there are six-color, eight-color, and even twelve-color ballpoint pens.
Classified by structure
(1) One-time ballpoint pen, the penholder is a refill, which can neither add ink nor change the refill. When the ink is used up, it can only be discarded.
(2) Ballpoint pens that can be refilled with buttons, springs, locks, and restorations.
(3) The pen holder can be rotated, so that the pen core extends to classify the ballpoint pen with the color of the ink.
(4) A ballpoint pen with a combination of a ballpoint pen and a pen, a combination of a ballpoint pen and a pencil, a combination of a ballpoint pen and a test pencil, a combination of a ballpoint pen and a small light bulb, and the like.
     Although there are many types of water-based ballpoint refill models, everyone has their favorite one. Like Xiaobian, I use a fixed one for years, because only the most convenient pen can have the highest work efficiency.
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