Improvements of paper quality and productivity have been accomplished by wider manufacturing width and higher speed paper machines, such as advanced model or modified paper machine as represented as Gap Formers as their counter plan in the pulp and paper making industry for external environmental issues, like raising raw material cost or various and high quality requirements from customers. Forming fabric designs have been developed from single layer fabric to triple or triple weft (3. 5layer

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... brics) fabrics which allow various purposes with respected results along with the improvement of paper machines. As a behind scene of those improvements, surely there are three major operation technologies make forming fabrics capabilities as their ultimate level, proper application of forming fabric specifications to meet requirements of paper machines, establishment of high-tech manufacturing processes of forming fabrics having various purposes and optimize fabric runnability to maximize paper machine efficiency. Let us focus on these three major points of forming fabric above to evaluate forming fabrics in general as follows.