蒸汽暴露条件对织物热防护性能的影响

为评价蒸汽压力、蒸汽与人体相对距离等条件对织物中热湿传递的作用规律,在蒸汽暴露条件下,测量不同蒸汽压力与喷射距离时织物的热防护性能,分析织物内储水量、蒸汽渗透量与热防护性能之间的关系,并探究蒸汽压力对储水量、渗透量的影响规律。结果表明:蒸汽暴露条件下,增大蒸汽压力与减少喷射距离能够降低织物的隔热性能,明显影响织物蒸汽热防护性能;织物透气性与皮肤二级烧伤时间呈显著负相关关系;另外,储水量、渗透量与蒸汽压力呈现正相关,且分别与织物的回潮率和透气性呈现正相关;降低水分吸收和减少蒸汽渗透是提高织物热防护性能的重要因素。

Influence of steam exposure condition on thermal protective performance of fabrics

Aiming to evaluate the effects of steam pressure and distance between hot steam and human body on thermal and moisture transfer of fabrics,this study was carried out to characterize thermal protective performance of fabrics under different steam pressures and jet distances.The relationship between water storage,steam permeability and thermal protective performance under the steam heat exposure condition was analyzed,and the influence of steam pressure on water storage and steam permeability was explored.The research findings indicate that increasing steam pressure and reducing jet distance can both decrease the thermal insulation,and evidently reduce the thermal protective performance of fabrics under steam exposure environment.Air permeability of fabric has a significant negative correlation with second degree burn time.In addition,both water storage and steam permeability are positively correlated with steam pressure,also with fabric′s moisture regain and air permeability.It is concluded that the decrease of water absorption and steam penetration determine thermal protective performance of fabrics.