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It is difficult to use when the pencil stub is less than 4cm.From the left chart we can easily come to the conclusion that the pencil core producing is the most complex in pencil manufacturing process.Although there are a lot of pencil lengthening device in the market,but 95% pencil stumpsare thrown away.You will waste the pencil lead with the same length of pencil core,when youthrow away the pencil stump.With shorter pencil lead,less wasted resource as well.


Academy of Art University

Academy of Art University
San Francisco, United States

YuSha Shi,
Academy of Art University

Baoli Du,
Beijing University of Civil Engineering and Architecture