ANALYSIS OF THERMOPHYSICAL PROPERTIES OF FIBER NONWAVE MATERIALS OF DIFFERENT COMPOSITION

Abstract

Determination of thermophysical properties of non-woven materials on the basis of elastic fibrous wastes intended for further use in the composition of biometric packages of belongings of military personnel.  Four  types  of  nonwovens  made  on  the  basis  of  the  elastic  fibrous  wastes  of  the  textile industry were investigated. To create a fibrous cloth used a combing machine brand CHBV. The obtained cloths were fastened by the needle punching operation on the VP-1 machine. The thermal conductivity was determined by the dynamic calorimetry method on an IT-λ-400 heat conductivity meter. In order to ensure
the necessary reliability of the obtained results, the data were processed using the method of mathematical statistics in Microsoft Excel. Results. Addition to the initial composition of PU/PA-6,6 PET fibers is shown to impair the thermal properties of the material. At the same time, the use of up to 50% by weight of natural fibers of flax and hemp allows to obtain a nonwoven fabric with a sufficiently low coefficient of thermal conductivity (0.15-
0.16 W/(m·K)) with a smaller surface than the original sample. density. At the same time, their specific mass isobaric heat capacity is almost independent of the surface density. Scientific  novelty.  The  regularities  of  the  influence  of  the  composition  and  surface  density  of nonwoven materials based on elastic fibrous wastes on their thermophysical properties are established. Practical  significance.  A  composition  was  proposed  and  nonwoven  materials  based  on  elastic 
fibrous  waste  with  improved  thermophysical  properties were  obtained  that  met  the  requirements  of  the biometric packages of clothing belonging to servicemen.