Due to their varied properties and diverse end uses nonwoven fabric contain a very significant proportion of total world textile product. In application of nonwoven fabric such as bedding and quilts, they function as thermal insulation material.therfore scrutiny of thermal property on these kind of nonwoven output is so essential. In this work, effect of fiber variable and also their mixture influence, together with the effect of fabric production parameters on thermal resistance of wadding produced by ordinary carding machine have been investigated. After a brief introduction to nonwoven, relevant information on thermal insulation is presented. An instrument to measure thermal resistance® of experimental species as Tog unit has been designed and built.Consequently, influence of fiber variable and physical properties of species such as density and thickness on thermal resistance have been surveyed. Result showed that, Tog value increases with an increase in fiber fineness and length.This phenomenon was also observed when the percentage of hollow polyester and polypropylene mixed with polyester was increased. The optimum percentage of hollow polyester is 65% and also optimum percentage of polypropylene is 45%. The Tog value was also increased and then decreased when the density of species was increased.result also indicates that the best density for these species is 450 gr/m 2 .
