Contact Us

Ningbo Fullmoon International Trade Co.,Ltd
Add:Xinlei North Road, 1#Yinzhou District, Ningbo, Zhejiang, China

Home > News > Content

Pencil Arrangement

Pencil , it is a pen for writing and painting sketch for classes, more than four hundred years of history, among them, the painting sketch Pencil is divided into many types, it is divided into three development stages, respectively is graphite, wooden pens, pencils with cap; In addition, it has red and white, black and white, yellow and black stripes.

Penholder logo

The hardness of pencil lead core is marked by "H" for hard pencils, "B" for soft pencils, "HB" for soft and hard pencils, "F" for the pencil between HB and H.

Arrangement (from soft to hard) 9B, 8B, 7B, 6B, 5B, 4B, 3B, 2B, 2B, B, HB, F, H, 2H, 3H, 4H, 5H, 6H, 7H, 8H, 9H, 10H, etc.

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 softer the lead, the darker the color. The classification of pencil rods is divided by the amount of graphite in the pencil. Among them, the H type pencils have relatively high hardness, which are suitable for relatively hard or definite objects such as woodworking, field drawing, etc. HB pencil core is of moderate hardness, suitable for general writing, or for contour use; Type B pencils, which are relatively soft and suitable for painting, and can also be used to fill out some machine recognizable CARDS. For example, we often use the 2B pencil to fill in the answer sheet. In addition, the usual colored pencil sticks, which are commonly used as colored pencils, are mainly used for drawing.

Use attention

1. Is the pencil lead poisonous? Actually the pencil core is not poisonous. Lead is poisonous, and graphite and clay are the main ingredients of the lead pencil, and of course there is no poison.

The bases of the pencil lead is graphite and clay, and graphite is flaky solid metal luster, among them with carbon - carbon bonds, is van der Waals force between layer and layer, carbon - carbon bonds is very stable, it is difficult to destroy, this is also why diamond and graphite is composed of carbon, but the physical properties and the price difference is very big, nothing can destroy the carbon - carbon bonds in the human body, so must say pencil lead is safe (unless it is inside the clay) harmful to human health.

2. Do you have metal poison in pencil?

Pencil rod appearance package mode or use pencil to paint technology, can protect the pens on one hand, on the other hand increase the beautiful, but the paint will contain trace heavy metals, a small amount of contact won't have influence, but bite penholder to eat into his mouth or bad.

Lead core processing graphite lead core match well with graphite and clay in a certain proportion, the kneading machine, three roller machine mixing, extruded through the pressure core machine a certain size (such as HB ~ 3 h lead core diameter is 1.80 ~ 2.10 mm) of the lead, the dry heating (50 ~ 150 ℃) and high temperature (800 ~ 1100 ℃) roasting, make its have certain mechanical strength and hardness, and finally made by immersion treatment. The color lead core is similar to graphite lead core, but no sintering is required. There are two kinds of processing methods: one is to mix the clay, the talcum powder, the adhesive, the color material, the oil and the wax and so on, after forming, drying and making, known as the mixing method. Is another kind of kaolin, talcum powder, such as colour and adhesive mixing extrusion into the lead or put the dry lead oil core container, under a certain temperature to make it fully absorb grease and made of called immersion method.

Home | About Us | Products | News | Exhibition | Contact Us | Feedback | Mobile | XML
Copyright © Ningbo Fullmoon International Trade Co.,Ltd All Rights Reserved.
  • facebook
  • twitter
  • Youtube
  • gmail
  • skype

Ningbo Fullmoon International Trade Co.,Ltd