What is the process of making a pencil

Pencil board processing unravels and cuts the logs, and the square saws are broken into pieces of wood. After hydrothermal treatment, they are cut into pencil boards by a board cutting machine. The board is 184mm long, 73mm wide, and 4.5.2mm thick. It is then dried by heating (60 ～ 120 ℃) And high temperature (130 ～ 200 ℃) denaturation treatment, so that the pencil board is softened and easy to curl.

Lead core processing Graphite lead core is made of graphite and clay in a certain proportion. After being kneaded by a kneading machine and a three-roller, a certain size is extruded by the core pressing machine (such as HB ～ 3H lead core diameter is 1.80 ～ 2.10mm) lead core, dried by heating (50 ～ 150 ℃) and roasted at high temperature (800 ～ 1100 ℃) to make it have certain mechanical strength and hardness, and finally made by oil immersion treatment.

The processing of color lead is similar to that of graphite, but there is no need for sintering. There are two processing methods: one is to mix clay, talc, adhesive, colorant, grease, wax, etc., and then form and dry it. It is called the mixing method; the other is to mix porcelain clay, talc powder, colorants and adhesives evenly and squeeze it into a lead core or place the dried lead core in an oil core container to make it full at a certain temperature It is made by absorbing grease and is called oil immersion method.

In the processing of pencil rods, a planer is used to plan the pencil board to a thickness of 4.4.2mm, and a slot plate with a core slot that is suitable for the diameter of the lead core. After heating and drying (50 ～ 120 ℃) for 1 ～ 8 hours under the state, it is processed by a planer to make a white rod pencil with a length of 178 ～ 180mm.

Appearance decoration processing The white bar pencil is decorated with paint and printing, as well as cutting, printing trademarks, rubber heads, etc., making it a finished pencil with certain specifications, appearance colors and patterns.

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