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”…
First of all, there is a big difference in blackness between the two pencils. The 2B pencil has a higher blackness, and the marks drawn are relatively black, while the HB pencil has a lower blackness, and the color of the marks drawn is relatively light, which is very different. In addition, the hardness…
1. Different pens. Mark pens are usually round, Mark pens are square and have hard pens. 2. Marking pens are usually oily, and their color is not easy to fall off. Because of their single function, there are few choices of color types and less changes in the pen head. Mark pens are generally…
Oily marker pen, is not soluble in water, but in alcohol, when the pen is dry, you can use a syringe to absorb a small amount of alcohol into the marker pen, and then you can use it. Oily marker pen has strong penetration, which is usually reflected on the back of the paper. And…
1. Correct Use of Pens The front of iridium pen tip will become thicker after a long time, and it can be written on both sides. (2) Ink should be fixed, and when using another ink, it should be cleaned and then absorbed. (3) Keep ink in the tube frequently, so as not to…