Clothing serves as a barrier to the outside environment, protecting you from a variety of external conditions. Thermal resistance is an important feature of heat insulation to make you feel warm even under extreme cold weather.
Thermal resistance is the ability of a fabric to create a thermal barrier between the human body and the surroundings. It is determined by measuring fabric warming property under a steady-state conditions by a sweating guarded-hotplate. It is a heat property and a measurement of a temperature difference by which an object or material resists a heat flow.
Good warm-feel clothing can protect a human body against hazardous thermal environments, especially the extreme cold weather. It creates a thermal barrier between the human body and the surroundings and prevents heat transfer from body to the environment causing heat loss.
The thermal resistance property of textile products can be determined through analyzing the heat transfer process of fabric and calculating the heat flow of thermal conductivity. The specimen is placed flatly on a hot plate with temperature of 35oC.
The hot plate and specimen are then placed in a chamber with lower temperature and a specified relative humidity. The heat flow of hot plate passes through the specimen and dissipates into the chamber due to the temperature difference between the hotplate and chamber. The sensor on the hotplate can measure the heat flow and calculate the thermal resistance.
The applicable methods include:
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