Fine screening

Paper consists of sheet materials that are comprised of bonded small discrete fibers. The fibers usually are ceUulosic in nature and are held together by hydrogen bonds (see Cellulose). The fibers are formed into a sheet on a fine screen from a dilute water suspension. The word paper is derived from papyms, a sheet made in ancient times by pressing together very thin strips of an Egyptian reed Cjperuspapyrus) (1). 

Fine screens Fine screens Flotation cells Optional Dilution... 

J. Slechta, I. J. Taggart, B. A. Eirth, and E. Gallagher, Evaluation ofaNovel JCibrating Fine Screen, unpubhshed report, 1981. 

In this test a specific amount of pigment in prepared form is forced through a fine screen pack by an extruder and the pressure rise upstream of the screen pack is measured. The calculation is done by the formula ... 

Bamberg, J. B., Longtine, C., Radcliffe, E. B. (1996). Fine screening Solanum (potato) germplasm accessions for resistance to Colorado potato beetle. American Journal of Potato Research, 73, 211-223. 

Douches, D. S., Bamberg, J. B., Kirk, W., Jastrzebski, K., Niemira, B. A., Coombs, J., Bisognin, D. A., Felcher, K. J. (2001). Evaluation of wild Solanum species for resistance to the US-8 genotype of Phytophthora infestans utilizing a fine-screening teehnique. American Journal of Potato Research, 78, 159-165. 

Bamberg, J. P., Peterson, L. A., Martin, M., Krueger, A. R. (1998). Fine screening potato (Solanum) species germplasm for tuber calcium. American Journal of Potato Research, 75, 181-186. 

Epoussetage (French for Dust Removal), The removal of dusty material from the grains of BkPdr or smokeless propellants was effected in France by shaking the grains on a fine screen... 

To properly fluidize and mix the material in the container, the correct choice of container and air distributor must be made. The container volume should be chosen such that the bowl is filled to at least 35 0% of its total volume and no more than 90% of its total volume. The correct choice of air distributor is important. These distributors are made of stainless steel and are available with a 2-30% open area. Typically, the distributor should be chosen so that the pressure drop across the product bed and air distributor is 200-300 mm of water column. A fine screen of 60-325 mesh normally covers the air distributor and retains the product in the container. This type of sandwiched construction has been used for the last 30 years in the fluid bed processors. The classic air distributor with the fine-prod-uct-retaining screen is shown in Figure 5. 

As part of program control, all cooling systems should employ certain items of fixed equipment, for example, coarse and fine screens, in cooling tower sump water boxes and recirculating pump suction intake areas. 

---