| In this thesis, the thermal insulation of waddings commonly used for winter clothes was investigated. The conclusions could provide a reference for the customers to choose the clothing and quilts with good thermal insulation and provide some guides for manufacturers to develop new waddings with better thermal insulation.6most common commercially available waddings were chosen, including spray-bonded polyester wadding,2kinds of silk-like polyester waddings, wool/polyester blended wadding, seven-hole polyester wadding and down wadding. The thermal insulation of the6waddings was investigated from4different aspects in this thesis.First, the thermal insulating properties of the6waddings were compared without wind. A YG606E test apparatus was used to test the thermal insulating properties of the6waddings. Through using the conversion methods which converted the measured thermal resistance to thermal resistance at the same thickness or mass, the thermal insulating properties of the6waddings were compared. The thermal resistances of spray-bonded polyester wadding, silk-like polyester wadding1, silk-like polyester wadding2, wool/polyester blended wadding, seven-hole polyester wadding and down wadding at10mm thickness were2.205clo,2.684clo,2.450clo,2.148clo,1.277clo and3.688clo, respectively. The thermal resistances of spray-bonded polyester wadding, silk-like polyester wadding1, silk-like polyester wadding2, wool/polyester blended wadding, seven-hole polyester wadding and down wadding at100g/m2were1.991clo,2.151clo,2.090clo,1.269clo,1.818clo and4.646clo, respectively. It was found that not only the thermal insulating properties of down wadding and silk-like polyester wadding1were best. They could make clothing aesthetically and lightly. In addition, it showed that seven-hole polyester wadding had the lowest thermal resistance at the same thickness, wool/polyester blended wadding had the lowest thermal resistance at the same mass. To achieve the same thermal insulation, a garment filled with seven-hole polyester wadding would look much more bulky and unbeautiful, a garment filled with wool/polyester blended wadding would be the heaviest and the wearer would feel uncomfortable.Second, the effect of1.3m/s vertical wind and the fabric permeability on the thermal insulation of the combinations of waddings and fabrics was investigated using YG606E test apparatus. By carrying out paired-samples t test, the measurement results of the thermal insulation of the wadding combinations before and after being blown a1.3m/s vertical wind were analyzed, the measurement results of the thermal insulation of combinations being wrapped with different fabrics with different permeability when being blown a1.3m/s vertical wind were also analyzed. It was found that, when the wadding combinations were blown a1.3m/s vertical wind, the thermal insulation of the wadding combinations decreased; the thermal insulation of the wadding combinations being wrapped with different fabrics with different permeability had significant differences, that was, the permeability of the fabric was bigger, the thermal insulation of the wadding combination with this fabric was worse, otherwise, better. By carrying out Pearson simple correlation coefficient, when the wadding combinations were blown a1.3m/s vertical wind, the correlation between thermal insulation reduction rate of the combinations and permeability of the fabrics was analyzed. It showed that, when the wadding combinations were blown a1.3m/s vertical wind, there was a significant positive correlation between the thermal insulation reduction rate of the combinations and the permeability of the fabrics, that was, the permeability of the fabric was bigger, the thermal insulation reduction rate of the wadding combinations being wrapped with this fabric was bigger. When the wind speed were1.3m/s, the average thermal insulation reduction rate of wadding combination being wrapped with polyester satin fabric (permeability210.607mm/s) was28.92%; The average thermal insulation reduction rate of wadding combination being wrapped with coated fabric (permeability2.044mm/s) was14.57%; The average thermal insulation reduction rate of wadding combination being wrapped with polyester taffeta (permeability21.210mm/s) was20.30%.Third, the effect of laundering on waddings’ thermal insulation was investigated in this thesis. A Sweating Guarded Hotplate306-200/400test apparatus was used to test the6waddings’ thermal resistance before and after being laundered5times,10times,15times and20times. The laundering was carried out according to the standard of8A in GB/T8629-2001. Paired-samples t test was carried out to analyze the waddings’thermal resistance before and after laundering. The results showed that, compared to before laundering, the6waddings’thermal resistance significantly decreased after being laundered5times,10times,15times and20times, and the waddings’thermal resistance changed most after being laundered10times, as the laundering times increased, the waddings’ thermal resistance intended to be stable. The thermal insulation reduction rates of spray-bonded polyester wadding, silk-like polyester wadding1, silk-like polyester wadding2, wool/polyester blended wadding, seven-hole polyester wadding and down wadding after being laundered10times were20.6%,14.2%,12.4%,31.8%,29.2%and25.1%, respectively."10mm thickness" of the6waddings, after being laundered10times, the thermal resistances of spray-bonded polyester wadding, silk-like polyester wadding1, silk-like polyester wadding2, wool/polyester blended wadding, seven-hole polyester wadding and down wadding decreased to1.621clo,2.427clo,1.993clo,1.356clo,1.232clo and2.307clo, respectively.Finally, the effect of prolonged compression on waddings’thermal insulation was investigated in this thesis. A Sweating Guarded Hotplate306-200/400test apparatus was used to test the6waddings’thermal resistance before and after being prolonged compressed. Specific compression situation:compression pressure was0.26kPa, pressing time was15days, rebound time was3days. Paired-samples t test was carried out to analyze the waddings’thermal resistance before and after being prolonged compressed. The results showed that, for the6waddings, the thermal resistance after being prolonged compressed was significantly smaller than that before being compressed. The thermal resistance reduction rates of spray-bonded polyester wadding, silk-like polyester wadding1, silk-like polyester wadding2, wool/polyester blended wadding, seven-hole polyester wadding and down wadding after being prolonged compressed were12.1%,6.9%,11.7%,11.6%,7.2%and7.9%, respectively."10mm thickness" of the6waddings, after being prolonged compressed, the thermal resistances of spray-bonded polyester wadding, silk-like polyester wadding1, silk-like polyester wadding2, wool/polyester blended wadding, seven-hole polyester wadding and down wadding were1.712clo,2.398clo,1.845clo,1.607clo,1.264clo and2.699clo, respectively.Finally, we found that, the thermal insulation of down was best, but its thermal insulation decreased largely after the down being repeated laundered and prolonged compressed, this should be paid attention to in apparel design and maintenance. Among the5nonwoven type waddings, the thermal insulation of silk-like polyester wadding1was best, and it had a good laundering-resistance and compression-resistance."10mm thickness" wadding, after being laundered10times or prolonged compressed15days (0.26kPa), the thermal resistance of silk-like polyester wadding1was much more close to the thermal resistance of down. |
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