| Based on the neurophysiological theory of wet sensation,through the dynamic contact experiment between fabric and human body,this study explores the influence law of fabric on human wet sensation difference,and obtains the change in fabric density and coolmax? content that arouses the wet sensation difference of human perceptibility.At the same time,understand the relationship between fabric density,fabric surface properties,roughness and wetness,and the relationship between content,cold feeling and wetness feeling,so as to help explore the internal mechanism of wetness feeling difference caused by fabric parameters.Changing the objective properties of the fabric by controlling the fabric parameters,the wet difference threshold is obtained.This makes the research results more operable in improving fabric comfort,such as changing or controlling fabric parameters to change fabric properties,so as to improve the thermal and wet comfort of clothing.In addition,it also provides consideration for businesses in reducing fabric costs.By studying the wet difference threshold,we can get the change in coolmax? content that causes the perceptible change of wet sensation in human body,therefore,the manufacturer can choose the fabric design scheme that contains less coolmax? under the same wet feeling psychological quantity,so as to achieve the purpose of cost saving.In order to achieve the above research purposes,this study uses Cherry Blossom full-automatic sample loom to weave 7 kinds of plain woven fabrics with different weft density by accurately controlling the density,and 7 kinds of plain woven fabric with different coolmax? content by controlling the weft throw ratio of different yarns.The 14 plain woven fabric is used as the experimental sample;By measuring the saturated water content of the fabric and considering the actual application scenario,two humidification quantities(25% absolute water content and 100% saturated water content)are determined;10 subjects participated in this study;Using the constant stimulation method,the reference stimulation and experimental stimulation were applied to the left and right arms of the subjects at the same time,and the arm height of the subjects was determined to ensure the consistent contact pressure of each subject during the experiment;Set up a test bench,determine the fabric holding length and mark it to ensure that the friction speed and fabric tension are consistent during the experiment;Under the condition of unified pressure,friction speed and relative humidity content,subjective experiments were carried out to evaluate and judge the difference of humidity feeling and humidity under each stimulation condition.The relationship between fabric parameters and subjective wet feeling is clarified,and the difference threshold of human wet feeling is calculated.Subjective wet feeling,rough feeling and cold feeling were measured;KES-FB4 surface performance tester is used to test the surface performance of fabric,and the relationship between fabric density and surface performance index is analyzed.Through the study of the above contents,the main conclusions are as follows:(1)surface performance analysis.Under the dry state,low moisture content and high moisture content,the SMD value decreases with the increase of fabric density,and the MIU value increases with the increase of fabric density;There was a significant linear correlation between SMD and Miu values and fabric density in the three states(P < 0.05),and the SMD and Miu values of fabrics in the three states as a whole: dry state > low moisture state > high moisture state;Pearson correlation analysis of SMD and Miu in three dry states shows that SMD and Miu are significantly negatively correlated in dry state and low humidity state(P < 0.01),but not in high humidity state(P > 0.05).Moisture content has a certain effect on fabric Miu.When the fabric changes from dry state to wet state,the fabric Miu will decrease significantly(P < 0.05),while from wet state to more wet state,it seems that the MIU value does not decrease significantly(P > 0.05).In addition,the moisture content had no significant effect on the SMD value of the fabric(P > 0.05).(2)Analysis of humidity difference caused by density changeThe sensitivity of human body to roughness and humidity in low humidity state is higher than that in high humidity state.The human body can distinguish the difference of roughness caused by density change under the two humidification states.And the ability of human body to distinguish roughness in high humidity state is lower,and it is weak in wet state.In the low humidity state,the human body can distinguish the humidity caused by the change of density,but it cannot distinguish in the high humidity state.In both wet states,the temperature input did not contribute to the humidity sensitivity(P > 0.05).Under low humidity condition,the fabric thickness has a certain contribution to the wet feeling(P < 0.05),while under high humidity condition,the fabric thickness has no contribution to the wet feeling(P > 0.05).There was no significant correlation between MIU,SMD and roughness in the two wet states(P >0.05).Under the condition of low humidity,miu was significantly negatively correlated with humidity(P < 0.05),and SMD was significantly positively correlated with humidity(P < 0.05).Under the condition of high humidity,miu,SMD and humidity sensitivity were not significant(P > 0.05).There was a significant negative correlation between subjective roughness and subjective wet feeling in the state of low moisture content(P < 0.05).(3)Due to the difference of humidity sensitivity caused by the change of coolmax?The analysis of humidity content has a certain impact on the sensitivity of human body to humidity and cold caused by the change of coolmax? content.In the state of low humidity,the sensitivity of human body to humidity and cold is even worse.In the low humidity state,the difference threshold of humidity and cold feeling is greater than that in the high humidity state.There are differences in humidity and cold sensitivity between the left and right arms under different humidity conditions.On the whole,the left arm is more sensitive to wet and cold than the right arm.Under different moisture content,the sensitivity of left and right arms is different.In the state of low moisture content,the sensory sensitivity of left and right arms is quite different.The difference of wet difference threshold between two arms is 15.7%,and the difference of cold difference threshold is 9.45%.Under the condition of high moisture content,the sensory sensitivity of the left and right arms has little difference.The difference between the wet difference threshold of the two arms is only 2.42%,and the difference between the cold difference threshold is only 3.18%.It is speculated that with the increase of fabric moisture content,the sensitivity difference between left and right arms to wet and cold will gradually narrow,but a large amount of data is needed to further support the verification.Temperature stimulation has a certain contribution to the sense of humidity and cold in the state of high humidity.The difference of skin temperature decrease rate between the two arms ?t was not statistically significant with cold and humidity in the state of low humidity(P > 0.05);Under the condition of high humidity,it was significantly positively correlated with cold and humidity(P <0.05).The thickness of fabric has a certain contribution to the wet and cold feeling in the state of high moisture content.Under the condition of low moisture content,the correlation between fabric thickness and wet and cold feeling is not statistically significant(P > 0.05);Under the condition of high moisture content,the fabric thickness was significantly positively correlated with wet and cold(P < 0.01).In order to more intuitively characterize the relationship between psychological quantity and physical quantity in the two wet states,curve estimation is used to evaluate the relationship between coolmax? proportion and humidity and cold feeling.Under the two humidification States,coolmax? proportion has a significant linear correlation with cold feeling and wet feeling.(P<0.05,R 2 ?0.695)? Under the two moisture contents,the change trend of sensory score with coolmax? is opposite.In the low moisture state,the wet and cold sensation increased with the increase of coolmax? content.In the high moisture state,the wet and cold sensation decreased with the increase of coolmax?.The reason may be the difference of water absorption and moisture conductivity of the fabric with the change of coolmax? content.There was a strong positive correlation between the two subjective feelings(cold and wet feeling)in the two wet states(P <0.01). |
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