|Product Name:||Paint rod HB pencil|
|Main Uses:||Studio, School|
|Place of origin:||Ningbo,China|
|Feature:||Creative, beautiful, concise and generous|
|The lead-core processed graphite lead core is prepared by a certain ratio of graphite and clay. After being kneaded by a kneading machine and a three-roller machine, it is extruded through a core machine to a certain size (for example, the diameter of the HB~3H lead core is 1.80~ 2.10mm) lead core, heated (50 ~ 150 ° C) dry and high temperature (800 ~ 1100 ° C) roasting, so that it has a certain mechanical strength and hardness, and finally made by oil immersion treatment. Color lead processing is similar to graphite lead, but does not require sintering. There are two kinds of processing methods: one is to mix clay, talcum powder, adhesive, color, grease and wax, and then formed by molding and drying, which is called mixing method; the other is porcelain clay and talcum powder. After the mixture of coloring materials and adhesives is uniformly mixed and extruded into a lead core or a dried lead core is placed in a wick container and fully absorbed at a certain temperature, it is called an oil immersion method.