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Pencil Writing A Pen Tip

Pencil, is a kind of pen used for writing and painting sketch, has been four hundred years of history, of which, drawing sketch pencil is divided into many types, it is divided into three stages of development, namely graphite, wood The pencil, with cap pencil; In addition, its color is red and white, black and white, black and black and other stripes,

"B" for soft pencils, "HB" for hard and soft pencils, and "F" for pencils with hardness between HB and H.

9B, 8B, 6B, 5B, 4B, 3B, 2B, B, HB, F, H, 2H, 3H, 4H, 5H, 6H, 7H, 8H, 9H, 10H, etc. Hardness grade.

The larger the number in front of H, the harder the lead, the lighter the color. The larger the number in front of B, the more soft the lead, the darker the color. The classification of the pencil is divided according to the weight of the graphite in the cartridge. Which is a relatively high hardness of the interface, such as woodworking, field drawing, etc .; HB pencil pencil hardness is moderate, suitable for general writing, or playing B-type pencil, refill is relatively soft, suitable for painting, can also be used to fill some of the machine can identify the card. For example, we often use the 2B pencil to fill the answer card. In addition, there are common color pencil poles, that is, people often say that the color pencil, mainly used for painting.

Pencil appearance

Divided into pencil cap and pencils in two parts: pencil cap appearance of the main materials for the polyester material, the production process can be divided into mold, offset, assembly and other processes to complete. Pencil poles The main decorative materials are nitrocellulose pencil paint, printing ink, foil, rubber head and aluminum hoop and so on. Production process can be divided into pencils, lead, pencils, finished products such as decorative process.

Pencil plate processing will open the wood, cut off, open side sawing into pieces, after the heat treatment through the cutting machine cut into a pencil plate. Plate length 184mm, width 73mm, thickness 4.8 ~ 5.2mm. And then heated (60 ~ 120 ℃) dry and high temperature (130 ~ 200 ℃) denaturation treatment, so that the pencil plate to soften the degree of easy to roll.

The lead core processing graphite lead is made of graphite and clay according to a certain proportion, the kneading machine, three roller blending, through the pressure die extrusion of a certain size (such as HB ~ 3H lead core diameter of 1.80 ~ 2.10mm) lead, by heating (50 ~ 150 ℃) drying and high temperature (800 ~ 1100 ℃) roasting, it has a certain mechanical strength and hardness, and finally made by oil immersion treatment. The color lead is similar to graphite lead, but does not require sintering. There are two kinds of processing methods: one is clay, talcum powder, adhesives, colorants, greases and waxes and other mixed evenly after forming, drying and made, known as the mixing method; the other is the clay, talc , Colorants and adhesives, etc. are mixed evenly after extrusion into lead or the lead through the dry core in the oil container, at a certain temperature to make it fully absorb grease and made, known as oil immersion method.

Pencils are machined. The pencils are cut into slots with a thickness of 4.1 to 4.2 mm and have a core groove in accordance with the diameter of the lead core. Then, the lead and pencil panels are glued together using a glue. Tightly heated (50 ~ 120 ℃) for 1 to 8 hours after drying, the machine made by the shaving machine length of 178 ~ 180mm white pole pencil.

The appearance of decorative processing will be white pole pencil paint and printing decoration, and cut light, print trademarks, rubber head, cap and other processing, making it a certain size, appearance color and pattern of finished pencil.

Use attention

1, pencil core toxic? In fact, pencil core is not toxic. Lead is toxic, and the main raw material for making pencil lead is graphite and clay, of course, no poison.

Pencil pen is the main component of graphite and clay, graphite is a scaly metal luster of the solid, which has a carbon-carbon chemical bond between the layer and the layer is van der Waals force, carbon-carbon chemical bond is very stable, It is difficult, and that is why the diamond and graphite are made of carbon, but the physical properties and price difference is very large, the human body can not damage the carbon-carbon chemical bond, so sure that the pencil lead is safe (unless Is inside the clay plus harmful to human health).

2, pencils have metal poison?

The appearance of the pencil has a package mold or pencil paint technology, on the one hand to protect the pen, on the other hand to increase the appearance, but the pigment will contain trace heavy metals, a small amount of contact will not be affected, but bite the pen to eat mouth or not Proper.

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