1, pencil board processing
The logs are split, cut and sawed into wood blocks, and then cut into pencil boards with a cutting machine after hydrothermal treatment. The plate is 184mm long, 73mm wide and 4.8 ~ 5.2 mm thick. After heating (60 ~ 120℃) and drying at high temperature (130 ~ 200℃), the pencil board becomes soft and easy to roll.
2. Lead processing
The graphite lead core is made of graphite and clay according to a certain proportion, which is mixed by a kneader and a three-roll machine, extruded into a lead core with a certain size by a core pressing machine, and heated and dried (50 ~ 150℃) and baked at a high temperature (800 ~1kloc-0/00℃) to make it have certain mechanical strength and hardness. Finally, the graphite lead core has a certain hardness. The processing of colored lead core is similar to that of graphite lead core, but it does not need sintering.
3, lead treatment method
One is to mix clay, talcum powder, adhesive, pigment, grease and wax evenly, then shape and dry, which is called mixing method; The other is to mix porcelain clay, talcum powder, pigment and adhesive evenly and then squeeze them into lead core, or put the dried lead core into an oil core container to make it fully absorb oil at a certain temperature, which is called oil immersion method.
4, pencil processing
Planing the pencil board into a groove board with a thickness of 4. 1 ~ 4.2 mm and a core groove corresponding to the diameter of the lead core, then bonding the lead core and the pencil board together with an adhesive, heating (50 ~ 120℃) and drying 1 ~ 8 hours in a clamped state, and then processing with a planer to obtain a length of 60.
5, appearance decoration processing
Paint white pencils, cut lights, print trademarks, install glue heads, caps, etc. So as to make it a finished pencil with certain specifications, appearance colors and patterns.