A test method for the cold and warm feeling of textiles simulating the physiological feeling of the human body

Abstract

The invention discloses a textile cold and warm feeling test method capable of simulating physiological sensation of a human body. The method can be realized by using hardware of an existing clothing, bedding and fabric thermal insulation property tester for testing, and the cold and warm feeling of a sample can be analyzed by optimizing the test method and using a signal within an abandon period in thermal insulation property test. The implementation method comprises the steps: controlling a test board temperature and heating power, setting a temperature and humidity of a test environment, judging whether the sample of a textile has cold feeling or warm feeling, and quantitatively analyzing a cold feeling / warm feeling index of the sample of the textile. Compared with the prior art, the test board heating power of a body surface simulating instrument is scientifically controlled to be more consistent with a true heat dissipation rule of the human body, and a measured physical quantity can more effectively represent human physiological sensation. The definitions of the cold feeling index and the warm feeling index with definite physical meaning are provided; the cold feeling index and the warm feeling index of the textile can be scientifically and reasonably detected and analyzed; cold feeling and warm feeling and heat retaining property indexes of the textile can be more accurately detected.

Description

technical field [0001] The invention relates to a test method for the warm and cool feeling of textiles which simulates the physiological sensation of human body, and belongs to the technical field of textile detection. Background technique [0002] The warm and cold feeling of textile contact is the judgment of cold or warm formed in the human brain by the temperature stimulation of the human skin at the initial stage of textile contact with the skin. The average body surface temperature is generally 33°C, and the temperature of textiles stored in winter and autumn environments is often lower than the skin temperature. In the initial stage of contact, heat must flow rapidly from the high-temperature body surface to the low-temperature textile until the temperatures of the two surfaces in contact with each other tend to be the same. When the heat flow is gradually stabilized, that is, it enters the steady state heat transfer. The previous heat transfer power is greater than ...

AI Technical Summary

Problems solved by technology

Because, first of all, for samples with a strong sense of coldness, the instrument hardware cannot quickly output thermal power indefinitely, resulting in the actual measured Q max Limited by instrument parameters, it cannot fully reflect the maximum heat flow of the sample; secondly, Q max It cannot reflect the length of cold feeling that is crucial to comfort and the heat lost by the human body due to cold feeling; third, when the difference in steady-state heat transfer is large, the maximum transient heat flow Q max also loses comparability

[0007] Although the invention patent 201410531445.2 gives three reasonable indicators to characterize the cold feeling (the cold feeling time t, the total heat dissipation during the cold feeling period W 1 , pure cooling heat dissipation W 2 ), but the specific time nodes for calculating these three indicators are unreasonable and difficult to implement

Because no instrument can make the temperature of the test board absolutely constant, it can only control the temperature of the test board in a small range, such as 33±0.2°C, which will lead to a minimum value in the thermal power curve, see figure 2 , actually no turning point can be found on the thermal power curve from decreasing to substantially constant

[0008] Therefore, the existing cooling index - the maximum transient heat flow Q under the condition of constant temperature of the test board max It cannot fully characterize the warm and cold feeling of textiles, and the cold feeling index calculated by the invention patent 201410531445.2 based on the thermal power curve obtained under the temperature and humidity of the non-standard test environment and the uncertain starting point and end point of the cold feeling cannot reflect the human feeling well. the true coldness of

Moreover, the heating power curve of the test plate in the invention patent 201410531445.2 drops to 0 rapidly during the cold feeling period, then rises rapidly, and then gradually stabilizes after falling rapidly (see figure 1 ), which is very different from the heat dissipation law of the human body after wearing textiles

[0009] In addition, with regard to the warm feeling of textiles, there is only a vague concept in the research and application fields. It is believed that the weak cold feeling of textiles is equivalent to the strong warm feeling. However, to what extent is the weak cold feeling considered warm? How to test and characterize the warmth of textiles? Analysis methods were never clearly defined and tested

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