Estudo das propriedades técnicas do calçado de proteção

Abstract

The objective of this Dissertation is to study the technical properties of protective footwear used by the Federal Highway Police, and verify whether it meets the requirements of the NRPRF-019.2015 standard, which provides the minimum conditions required for the manufacture of footwear. For the Federal Highway Police, this study will serve as a basis for improving footwear, since in 2015 an investment was made to manufacture a new uniform, including operational footwear. This study was carried out using two shoes with 15 (fifteen) days of use, to compare with other new, unused shoes. It was observed that the shoe during use presented deformities in its structure, such as tearing of the seam at points that suffer great stress, especially in the region of the barrel, where the mooring hooks are located, as well as between the seam between the external and the internal parts. of the pipe. In view of these results, the seam allowance and the type of stitch used in that region were analyzed. The seam allowance was measured using a millimeter ruler, while the type of stitch was checked which stitch was used, in order to verify if it is a stress resistant stitch. Color variation in the shoe was also observed, so tests were carried out to analyze the color change of the fabric, using a reflectance spectrophotometer, the regions of the barrel, tongue and collar were analyzed, as well as a hydrophobicity test in seven sections of the new shoes, which encompasses the inside and outside of the shoe, with the purpose of verifying whether the shoe meets the liquid repellency property. The results obtained showed that, in relation to the seam allowance, as it is a polyester fabric, the margin should be greater than that found, around 1.5 cm; on the other hand, the results of the hydrophobicity tests showed that the external and internal parts perfectly meet the standard and in the color variation test, it was observed that there was color variation in the collar and barrel, both located in the back of the shoe, directly exposed region the light.