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Analysis of Basis Weight Uniformity Indexes for the Evaluation of Fiber Injection Molded Nonwoven Preforms

Moll Patrick, Wang Shaofan, Coutandin Sven, Fleischer Jürgen

Autex Research Journal

2021

Vol. 21, no. 3

341--351

Fiber injection molding is an innovative approach for the manufacturing of nonwoven preforms but products currently lack a homogeneous fiber distribution. Based on a mold-integrated monitoring system, the uniformity of the manufactured preforms will be investigated. As no universally accepted definition or method for measuring uniformity is accepted yet, this article aims to find a suitable uniformity index for evaluating fiber injection molded nonwovens. Based on a literature review, different methods are implemented and used to analyze simulated images with given distribution properties, as well as images of real nonwovens. This study showed that quadrant-based methods are suitable for evaluating the basis weight uniformity. It has been found that the indexes are influenced by the number of quadrants. Changes in sample size do not affect the indexes when keeping the quadrant number constant. The quadrants-based calculation of the coefficient of variation showed the best suitability as it shows good robustness and steady index for varying degrees of fiber distribution.

Quality assurance in the european higher education area

Karkoszka T.

Journal of Achievements in Materials and Manufacturing Engineering

2009

Vol. 37, nr 2

759-766

Purpose of the presented paper aims at motivating the necessity of assuring the quality in higher education by implementation of the quality management system Design/methodology/approach covers the characterisation of strategic aims of the higher education, mostly - the principles of performance of higher education systems making possible the European cooperation and the comparability of the mechanisms and the results of activity. Findings of the carried out research are as follows: implementation of the rules of higher education system should ensure: level of education being the quality standard, coherent educational system allowing for mobile choice of the place of education, universal accessibility of education, lifelong education as well as recognition of knowledge, skills and qualifications in all countries of European Union. Practical implications: refers to any university which wants to assure quality in education by taking part in the Bologna Process. Originality/value: of the presented paper belongs to the idea and the progress of the Bologna Process as a European widespread venture aiming at establishing the European Higher Education Area and determination of the directions of development of higher education and the research systems.