Abstract
This paper deals with the method which calculates a filtration efficiency of nonwoven textiles from scattered light intensity by seeding particles. The filtration efficiency is commonly measured by particle counters. Samples of liquid or gas are taken during a test in front of and behind a filtration material. The concentration of particles is measured and the filtration efficiency is calculated. The filtration efficiency does not have to be uniform in its whole surface. The uniformity of filtration is another indicator of a quality of filtration materials. Measurements described in this article were performed on a water filtration setup which enables optical access to the place where the filtration material is mounted. Pictures of illuminated seeding particles are made by a laser sheet and a camera. Visualisation of the filtration process enables measuring of the efficiency of separation versus time and also versus two-dimensional position in case of use of a traverse mechanism. The filtration textiles were tested by 1 µm seeding particles. Mean value of light intensity and number of bright pixels in evaluative areas during image analysis were obtained. On the basis of these data, the filtration efficiency is calculated. The best image analysis method was chosen.
Highlights
1.1 Investigation of filtration materialsA filtration material represents an important element in many industrial processes
This paper deals with the method which calculates a filtration efficiency of nonwoven textiles from scattered light intensity by seeding particles
The filtration efficiency was calculated in five places of the sample, see figure 10
Summary
A filtration material represents an important element in many industrial processes. The filtration material is a barrier which retains suspended particles in a medium. The uniformity or homogeneity in thickness and the uniformity of fibres arrangement of a filtration material is an important quality. The filtration efficiency EF is a ratio between concentrations upstream G1 and a downstream G2 (2) All these parameters determine the total quality of the filtration materials [1]. Online research methods which are based on automated fibre sizing use the special software [2]. These methods do not describe behaviour of a filter during a process. Homogeneity of the filtration (the filtration efficiency versus two-dimensional position) is measured
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