Card room removal

Figure 8. Cumulative distribution curves of distributions shown in Figure 7. Key , cotton control O, 0.60% Milube N-32 A, distribution of dust removed from card room atmosphere when Milube N-32 is added to cotton.

The parameters of the PSD of the particles removed from the card room atmosphere by applying 0.6% of Milube N-32 (Figure 8) were... 

Figure 9. Reduction in number of dust particles in card room as a function of diameter. Fraction removed compared with control when processing cotton with 0.60% Milube N-32 applied fn), 0.48% Texspray applied fAl, and electrostatic precipitator in filter system (O).

Figure 10. Cumulative distribution curves of dust in card room atmosphere while processing cotton with an electrostatic precipitator (ESP) in filtration line. Key curve for ESP energized O, curve for ESP not energized and A, size distribution removed by ESP.

Brown and Bern (26) cinalyzed the elemental composition of four card room dusts using X-ray fluorescence spectroscopy. Two of these were from filter cake material collected in two textile mills from which fine dusts (<20 ym) were separated by mechanical agitation (sonic sifting). The third sample was from filter cake material collected in a textile mill from which dust was removed by hexane washing followed by sonification of the bath, filtration and further sonification. The fourth sample came from dust collected on an electrostatic precipitator in a model card room. Results are shown in Table VI. 

Brown and coworkers (17-18,47) reported compositions of dusts from cotton compresses and warehouses. Samples were removed with the aid of a sonic bath in hexane. The compresses were in Mississippi, Southeastern and Western Texas, and New Mexico. The samples in the bale press area were high in ash content with silicon the most abundant element (up to 18.7% in one New Mexico compress Scimple). Compared with card room dusts, samples from compresses were high in aluminum, silicon, chlorine, iron and magnesium and relatively low in potassium, phosphorus and zinc. The ratio of silica to silicon was high also for these scunples compared with textile mill dusts. 

Remove the tube rack fi om the water bath. Remove the sealing cards and place the tube rack on the base of the Gen-Probe magnetic separation unit for 5 min at room temperature. 

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