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Filter life Measure of the duration of a filter’s useful service. This is based on the amount of standard contaminant required to cause differential pressure to increase to an unacceptable level – typically 2 – 4 times the initial differential pressure, a 50 – 80% drop in initial flow, or an unacceptable downstream amount of particulate matter. |
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Filter media A porous material for separating suspended particulate matter from fluid. |
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Filter medium The permeable portion of a filtration system that provides liquid/solid separation, such as screens, papers, non-wovens, granular beds and other porous media. |
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Filtrate The discharge liquor in filtration. |
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Filtration A process of separating particulate matter from a fluid by passing it through a permeable material. |
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Flow rate Measure of the amount of fluid passing through the filter. This is always a variable depending on filter area, porosity, contamination and differential pressure. |
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Frame The purpose of the frame is to hold the tensioned screen printing mesh. It has to be stable enough not to be deformed by the big forces of the highly stretched mesh and the printing process. |
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Frame section Beside the material (steel, aluminium), the profile and the cross section are crucial for the dimensional stability of screen printing frames. We distinguish between square- rectangular - and special sections. |
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Frazier test Measures the amount of air transmitted through a filter under selected differential pressures. Historically used for textile products. See Air flow. |
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Frequency Number of cycles of current per second, expressed in Hertz (Hz). |
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G.M.P. Good Manufacturing Practices. Food and Drug Administration regulations governing the manufacture of drugs and medical devices (Ref. Code of Federal Regulations 21CFR). |
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Half-tone There are two different types of half-tone:
Amplitude modulated rastering (AM): Resolution in a constant number of dots per area, the dot sizes are variable.
Frequency modulated rastering (FM): The dots are as small as possible but the size is constant. The number of dots per area is variable. |
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Half-tone printing Printing of in halftone dots converted continuous-tone images, consisting of individual raster dots. |
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Hydrophilic Having an affinity for water and aqueous solutions. |
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Hydrophobic Cannot be wetted by aqueous and other high surface tension fluids. |
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Ink release Release of the ink from the stencil |
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Ink volume, ink deposit dry Ink deposit after drying respectively hardening of the ink in mm |
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Knit fabric A fabric structure made by interlooping yarns, a type of knitted fabric |
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Loaded (plugged) A filter element that has collected a sufficient quantity of insoluble contaminants such that it can no longer pass its normal-rated flow without excessive differential pressure. |
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Mean filtration rating Derived from Bubble Point test method. Data should be used as a guide only to compare overall retention capabilities between fabrics and should not be considered a guarantee of the particle size that the fabric will retain. |
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