1. The pen is more durable than the general pen, but if it is used improperly, it can’t be written. This is mainly because the dry solid ink sticks around the steel ball to hinder the ink from flowing out. Ink is a viscous oil which is prepared by using sesame oil, synthetic pine nut…
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. A ballpoint pen is a pen that…
The traces of the ballpoint pen can be washed out in the following ways: 1, benzene. Immerse the clothes with ballpoint pens in warm water of 40 degrees for a while, then scrub them carefully with cotton balls dipped in benzene. After scrubbing, wash them with common detergents such as washing powder and laundry…
The pictures above are 0.38 pin-and-tube pen core and 0.5 bullet pen core respectively. In fact, the difference between needle-and-tube type and bullet type is the thickness of the core. Because the bullet type is self-contained, it can be applied to a very thick core, the thickest can be more than 1.2, which is…
The specifications and classifications of neutral core are needle-tube core, semi-needle-tube core and bullet-head core. In fact, the difference between needle-and-tube type and bullet type is the difference between the thickness of the core, because the bullet type is self-contained, so it can be applied to very thick core, the thickest can be more…
“4H and 3B” represent the degree of hardness and softness of a pencil lead. The pencil with graphite as the main material can be used for drawing and writing. The hardness mark of graphite lead core is usually “H” for hard pencil, “B” for soft pencil, “HB” for soft pencil, and “F” for pencil…
The difference between 2B pencil and 3B pencil is: First, the hardness of pencil lead is different. The hardness mark of pencil lead is usually “H” for hard pencil, “B” for soft pencil, “HB” for soft and moderate pencil, and “F” for pencil with hardness between HB and H. Arrangement (from soft to hard)…
Advantages: rich level, deep and detailed drawing. Disadvantage: The picture is easy to reflect light and gray. The hardness mark of pencil lead is usually “H” for hard pencil, “B” for soft pencil, “HB” for soft and moderate pencil, and “F” for pencil with hardness between HB and H. Pencil is a kind of…
Pencils are machined as follows: Pencil board processing: 1. Unfold and cut logs, cut square and saw them into blocks. After hydrothermal treatment, they are cut into pencil boards by a board cutter. The plate is 184 mm long, 73 mm wide and 4.8-5.2 mm thick. The pencil board is softened and easy to…
Graphite pencils: According to GB/T 149-1995, according to their hardness, they are divided into 18 kinds: 6B, 5B, 4B, 3B, 2B, B, HB, F, H, 2H, 3H, 4H, 5H, 6H, 7H, 8H, 9H and 10H. Hard pencils use “H” (Hard for hard), soft pencils use “B” (Black for black), and ordinary hardness use “HB”…