Fabric thermal protection time evaluation method

Abstract

The invention discloses a fabric thermal protection time evaluation method. The method comprises the following steps of determining the continuous heat exposure time when the skin reaches secondary burn and the corresponding first safe cooling time when the heat release effect of the fabric is not considered, determining the minimum heat exposure time when the skin reaches the secondary burn and the corresponding second safe cooling time when the fabric heat releaseeffect is completely considered, and determining a plurality of pieces of safe heat exposure time between the minimum heat exposure time and the continuous heat exposure time and a plurality of pieces of corresponding third safe cooling time, and taking the plurality of pieces ofheatexposure times as x data and the plurality ofpieces of cooling times as y data to obtain a safe time curve of the fabric, and further forming a closed region by the curve, the x axis and the y axis to obtain a safe time region of the fabric. Thescheme has the advantages that the reasonable and accurate fabric heatprotection performance evaluation method is re-established so as to comprehensively show the heatprotection effect of the fabricon the human skin under different conditions.

Description

technical field [0001] The invention relates to the technical field of heat protection safety, in particular to an evaluation method for fabric heat protection time. Background technique [0002] Thermal protection performance test methods and standards are the basis for the development of high-performance protective clothing and equipment. At present, many countries have put forward legislative requirements on the performance of thermal protection materials and products, and the evaluation methods and testing equipment for the thermal protection performance of fabrics are also constantly developing and improving. The development of fabric thermal protection performance evaluation methods mainly takes 2018 as a node, which is divided into the early heat transfer performance test and the later comprehensive thermal protection performance test based on skin burn prediction. Specifically, before 2018, the test standards ASTM D4108-87 and ASTM F1939-99a were mainly used to test...

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Problems solved by technology

[0006] (2) This method may fail in practical application

In actual operation, it may happen that the MET of different fabrics is the same, but the heat release time of the fabrics required to achieve second-degree burns is different. For this situation, it is difficult to further distinguish the true fabrics of these fabrics by the current test standards. Thermal protection performance

[0007] (3) It is difficult to describe the "variable heat protection time" characteristics of fabrics

This shows that under different test conditions, the fabric has the characteristic of "variable thermal protection time" for the skin, while the traditional theory of "single thermal protection time" for fabrics is not suitable for thermal protection research under complex and variable conditions

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