Burden of anti-服 热 and wet resistance research

With the frequent occurrence of terror and violent incidents, the development and development of individual protective equipment is increasingly valued. In order to protect the people's people and law enforcement personnel, we need to develop security practical anti-spinning clothing. United States The Judicial Society pointed out that the design philosophy of anti-stabbing in "National Breakfast Standard" should be ldquo; can be weareable + appropriate protection u003d save life rdquo; [1], anti-spirassment is reaching the protection performance requirements, demand The wearing frequency of the anti-spiking clothing causes the person who can't be worn in the case of the person in the case of emergency.

At present, the stab prisoners are divided into hard Two major categories of quality and soft. The core components of hard anti-stab clothing are hard substrates, such as stainless steel, aluminum alloys, etc., the hard substrate has good stabbed wear capacity, but limits the flexibility of the wearer; soft The quality defensive substrate is made of a single variety of high-performance fibers, composite stab materials made of different forms of fiber aggregation and compounding are still in research.

Under normal circumstances, the human core temperature needs to be around 37 ° C to maintain comfort [2]. Anti-stab as an important medium in the heat exchange between people and the environment, participating in the establishment of two thermal exchange environments in human clothing and clothing. As a special protective equipment, the insulation and moisturification performance of anti-spiking clothes are very different from general costumes, and multi-layer substrates tend to stimulate human body thermal stress, so that warning security people feel psychological and physiological exhaustion [3], Danger. Therefore, the thermal wet transmission performance of anti-stabbing is helpful in meeting the dynamic thermal balance between the human and environment, achieving the best coordination of the human anti-stab environment system, and prevents the risk of physical speed and the discomfort caused by heat accumulation. . The thermal wet transmission performance test method of the clothing has a subjective evaluation method and objective measurement method. Subjective evaluation methods are more acceptable, and different individuals accept the difference in cognitive reactions lead to a large difference in test results. Objective measuring method usually by measuring clothing thermal resistance Evaluate the thermal wet transmission performance, the cost of the cost of the clothing layer and the ratio of the temperature difference between the garment layer and the amount of heat flow through the garment unit area reflect the thermal capacity of the clothing; wet resistance table The water vapor pressure difference between the layers is reflected in the moisture absorption capability of clothing [4].

warm More than 70 years of experience in the development of physical fake people is one of the ideal tools for measuring the thermal resistance of clothing at room temperature. Ldquo; Walter rdquo; and ldquo; newton rdquo; is currently the most widely used warm body dummy. Ldquo; newton rdquo ; Measurement TechnkOlogyNorthWest uses a thermally conductive aluminum filled carbon fiber housing, which can achieve multi-partition temperature, anti-sweating volume separately. Walter rDQUO; Walter Rdquo; manufactured by Waterproof fiber by Hong Kong Institute of Technology, Overall Temperature Control [5] Wang Haiming et al. [6] Using ldquo; Walter Rdquo; sweeping warm body dummy tested 3 sets of hot wet transmission characteristics at room temperature, analyzed the consistency and existence of experimental results in different regional testing; Li Feifei [ 7] Using ldquo; Walter Rdquo; sweating warm body dummy studied the thermal resistance resistance of different types of warm clothing in a cold environment; Han Xuefeng et al [8] uses ldquo; newton rdquo; sweating warm body dummy developed low temperature disaster simulation The test system simulates human physiological activities. Thermal dummy simulates the thermal exchange process of the human body, clothing and the environment at room temperature and low temperature environment, evaluates objective, repetitiveness. Due to high temperature, the ambient temperature is higher than the dummy, It caused the dummy's body temperature to remain constant, so the heat generation was almost 0, and the dummy could not determine the thermal resistance and wet resistance of the cost of clothing. The thermal resistance and wet resistance method were measured at the high temperature of this paper expanded the application of the warm body fake person. Systematic research provides theoretical and experimental basis for the effect of environmental parameters on anti-spinning clothing and wet resistance.

First, Experimental method

1 Dummy ldquo; Newton Rdquo; To measure thermal resistance and wet resistance. Ldquo; newton rdquo; 20 partitions, each partition has independent heating control and temperature sensing system, which can realize the constant temperature control function of regional skin and constant power heating function. The skin system provides water separation by 20 regions, each region contains a separate controller, and adjusts water flow through water flow control valves, external pressure pumps. The computer control system uses a supporting THERMDAC software to achieve various partition temperatures, heating and sweating rates. Independent adjustment, as well as implementation of data real-time detection, control, control, recording, and transmission during the experiment. The experimental test is in size 6.0M Times; 5.0M Times; 2.7m enclosed environment cabin, the temperature and humidity range of temperature and humidity can be 8 ° C Plusmn; 0.5 ° C ~ 48 ° C PLUSMN; 0.5 ° C and 30% PLUSMN; 5% ~ 80% PLUSMN; 5%. The environment tank is located in large rooms in the building, which reduces the heat exchange with the outside world. Environmental cabin wall consists of polyethylene foam Componsed with steel plates. Air conditioningFrom the ceiling wind, from the floor back to the wind. Distributed 10 WZP-PT100 thermocouples ( PLUSMN; 0.1 ° C) in the cabin measurement; AM-101 humidity sensor ( PLUSMN; 3%) is placed in the center of the room. WarmThe experiment scenario placed in the environment is shown in Figure 1.