Product properties filter cakes

The fiber cloth is the deciding ctor in the success or failure of all press operations. In view of the wide range of process variables involved in the filtration process, it is virtually in ossible to select a filter medium that will satisfy all process requirements and the usual limited time scale available for cloth selection is used to find an acceptable medium, i.e. one that will satisfy most, if not all of the requirements. In this reject, one particular requirement (e.g. filtrate clarity) may have to be relaxed, if other specifications (e.g. filtrate rate, absence of blinding) are to be maximised. Thus the more open weave Mcs will be superior in nonblinding characteristics, but may have poor particle retention. The latter will in rove in the order monofilament < muldfilament < staple fibre. Tabulated information is presented in Tables 4.2,4.3 and 4.4 below on the effect of yam properties, weave patterns, etc. on the processes of cake release, productivity, resistance to blinding, etc.. 

The efficiency of a rotary drum filter is expressed by the product of the average filtration rate and the ratio of filtrate volume to weight of filter aid spent. Efficiency reaches a maximum at different rates of knife motion and varies according to the properties of the specific filter aid. An increase in the thickness of a cake layer cut results in a ratio of filtrate volume to weight of filter aid spent. One should account for the volume weight of different filter aids since this parameter varies considerably even among different grades of the same material. 

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