Determining Fabric Thickness under Zero Pressure without Measuring any Dimensions.

Document Type : Research Studies

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Textile Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.

Abstract

In this paper a new scientific method is developed to measure thickness of any three-dimensional limp structure such as fabrics whatever their type (woven, non woven, knitted, etc.), paper, and so on. Material needed for testing must have a perfect rectangular strip shape. There is no need to know how long or how wide the tested sample is. The necessary eondition is that these structures are very easy to bend. This method depends on mathematical relations and physical interpretations which are used to replace direct thickness measuring by fabric weight measuring after shaping (corrugating) it round light circular straight identical cylinders placed in one plane in a jamming situation. Fabric shaping is repeated on another part of fabric strip but with another cylinder diameter. This results in a new eorrugated fabric weight. A formula is derived to obtain fabric thickness as a funetion of two weights of corrugated fabric and two cylinder diameters. Cylinder diameter must be proportional to both fabric thickness and fabric flexural rigidity. This means that, to make bending and therefore corrugating easier, cylinder diameter must be properly chosen. The idea of a new fabric thickness meter ealled HFTM (Hamdy Fabrie Thiekness Meter) is explained.

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