尼龙网面积计算

参照EN 1186-1，直接量表面积或投影面积。

9.12 Fibres and cloths
Polymeric fibres and cloths are used to make such articles as sacks, filters, conveyor belting and bags for the infusion of beverages. In these circumstances it is not practicable to determine the surface area of the individual fibres in contact with the foodstuffs. Where limits of overall migration are expressed in milligrams per square decimetre of surface area the surface area may be taken as the superficial or projected area of the article.

如果网很密且斯很细
直接算面积
如果网不密且丝较粗
先算一根丝的表面积
再算一块的面积

一块上面也很多根啊，数的眼花~量一根，再拿一把称重就算了，不过就是有点误差。。。