Author Archives: wyf695916308

What are the specifications and classifications of neutral core?

  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…

What does 4H and 3B on a pencil stand for?

  “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…

What’s the difference between 2B pencil and 3B 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)…

What are the characteristics of pencils?

  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…

How is a pencil made?

  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…