DeLuca L B
Environ Health Perspect. 1986 Apr;66:173-81. doi: 10.1289/ehp.8666173.
The original cotton particulates analyzer used stationary screens to separate aerodynamically the coarse and fine dust fractions from small samples of cotton. By replacing stationary with rotary screens that were continuously cleaned, larger supplies of respirable dust were obtained without interruption. A ginned and a waste cotton were used to test two methods of separation: a rotating 38-micron screen and a tandem rotating 710- or 38- micron screen and cyclone. The fine dust fractions from both systems were captured on filters and examined gravimetrically, by Coulter counter, and scanning electron microscope. The dust passing 38 micron stationary or rotary screens contained particles of 15 micron maximum diameter whereas dust from the 710-gmm rotary screen and tandem cyclone exhibited particles of 10 micron maximum diameter and lint fragments. Dust fractions with particles less than 10 micron diameter and free of lint were obtained with a 38-micron rotary screen and tandem cyclone.
最初的棉花颗粒分析仪使用固定筛网，通过空气动力学方法从小样本棉花中分离出粗尘和细尘部分。通过用连续清洁的旋转筛网取代固定筛网，可在不中断的情况下获得更多的可吸入粉尘。使用皮棉和废棉测试了两种分离方法：一个旋转的38微米筛网以及一个串联的旋转710微米或38微米筛网与旋风分离器。两个系统的细尘部分均捕集在滤膜上，并通过重量法、库尔特计数器和扫描电子显微镜进行检测。通过38微米固定或旋转筛网的粉尘含有最大直径为15微米的颗粒，而来自710微米旋转筛网和串联旋风分离器的粉尘则呈现出最大直径为10微米的颗粒和棉绒碎片。使用38微米旋转筛网和串联旋风分离器可获得直径小于10微米且无棉绒的粉尘部分。
