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铅笔的质量通常从外观和笔芯两力面来鉴别。在外观质量方面,除长度、圆径外还须检验笔杆弯曲变形、笔端伤缺、裂缝、开胶、崩芯、伤纹与油漆质最等。笔芯质量方面包括硬度、挠曲强度、浓度、滑度、芯尖受力等项。铅笔的外观质量很重要。漆面光洁图案印花美观色泽鲜艳是挑选铅笔时最注意的几个方面。笔芯质量的好坏是决定铅笔好坏的关健因为它直接影响使用效果。笔芯的质最主要决定于以下五点。 (1)笔芯的浓度:所谓浓度(颜色铅笔的铅芯称着色力)就是用铅芯在纸上书写时留在纸上笔迹的黑度或颜色。铅芯分
The quality of the pencil is usually identified from the look and feel of both refills. In the appearance of quality, in addition to the length, diameter outside the cylinder must be tested bending deformation, pen injury, cracks, open plastic, collapsing, injury and paint the most quality. Refill quality, including hardness, flexural strength, concentration, smoothness, core force and other items. The quality of the appearance of the pencil is very important. Bright and beautiful finish printing beautiful color printing is the most attention when choosing a pencil several aspects. The quality of the pen is the key to determine the quality of the pencil because it directly affects the use of results. The quality of the refill is mainly determined by the following five points. (1) Concentration of refills: The so-called darkness or color of the handwriting remaining on the paper when the lead is used to write on paper is called density. Lead core points