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چكيده انگليسي :

The influence of fiber crimp on the properties of polypropylene fibrous web Mohsen Panahi Mohsen panahi@tx iut ac ir Date of Submission 15 09 2013 Department of Textile Engineering Isfahan University of Technology Isfahan 84156 83111 IranLanguage Farsi Degree M ScDr Hosein Tavanai tavanai@cc iut ac ir Dr Mohammad Zarrebini zarrebini@cc iut ac ir AbstractCrimp is the feature that illustrates the wavy form of wool fibers Considering the very lowmoisture absorption as well as low heat insulation power of synthetic fibers insertingcrimp along the man made fibers improves the the transfer properties and hence rendersman made fibers more suitable for applications like apparel floor covering and hometextiles In this context crimp frequency carries a great deal of importance and greatlyaffects the properties of the final product Crimping the man made fiber lies in the field oftexturizing and is employed for almost all of man made fibers by stuffer box technique Crimped staole fibers are converted to fibrous web using conventional carding process Theaim of this project was to investigate the effect of crimp frequency of polypropylene staplefibers on the sound and heat insulating properties of their non woven webs To carry outthis research 3 lots of polypropylene fibers with linear densities of 9 14 and18 denier wasproduced on an industrial scale melt spinning line equipped with sutffer box crimping unit Low medium and high levels of crimp frequency were chosen for each lot subjected tocrimping unit limitations The textured tows were then cut and then the non woven webs 10x10 cm2 5 g cm2 were produced on a laboratory scale carding machine The sound andheat insulating properties of the non woven webs were measured by impedance tube andhot plate instrument respectively The results revealed that the sound absorption propertiesof non woven webs are not only affected by the crimp frequency of the fibers but alsofactors such as fiber fineness the thickness of webs as well as compression determinesound absorption Higher levels of crimp frequency led to higher sound absorption by thecarded webs in other words the sound wave friction loss increases The highest soundabsorption coefficient was recorded for the sample with lowest fiber fineness and highestcrimp frequency As far as heat insulating properties are concerned like sound absorption apart from crimp frequency other factors like fiber fineness and web porosity affectedsound absorption In this context the air trapped between fibers plays an important role The highest heat insulating property was also recorded for the web with lowest finenessand highest crimp frequency which were 9 denier and 1 9 crimp per cm respectively KeywordsCrimp sound absorption heat insulation nonwoven polypropylene web

پناهي، محسن

تاثير تجعد بر جذب صوت و ايزولاسيون گرمايي لايه بي بافت پلي پروپيلن