مهندسی نساجی گیلان:. گیل تکس

سایت تخصصی نساجی و پوشاک

مهندسی نساجی گیلان:. گیل تکس

سایت تخصصی نساجی و پوشاک

Measurement of sound absorption coefficient of nonwoven fabrics

Measurement of sound absorption coefficient of nonwoven fabrics
 Fereshteh Shahani,Mohamad Zarebini
Abstract Nonwoven fabrics comprise a very significant proportion of total world textile output. This is due to their varied properties that have enabled these types of textiles to be used in wide range of applications. In application such as floor and wall covering or as automobile carpets; nonwoven fabrics not only must serve as carpets, but also must function as sound insulation materials. In this work the effect of fiber variables together with the influence of fabric production parameters on sound absorption properties of polypropylene needled floor covering having different surface effects have been investigated. An instrument to measure noise absorption coefficient (NAC) of the experimental samples has been designed and built. A commercial melt spinning line was used to manufacture staple polypropylene fibers of different fineness. A two swift carding machine together with a horizontal cross-lapper was employed to obtain the required batts of fibers.
Key words: Nonwoven, sound absorption, measurement of NAC

ادامه مطلب ...

ﻣﻄﺎﻟﻌﻪ ﻓﻨﻲ و اﻗﺘﺼﺎدی اﺳﺘﻔﺎده از ﺳﺎزهﻫﺎی ﭘﺎرﭼﻪای در ﭘﺴﺖ


ﻣﻄﺎﻟﻌﻪ ﻓﻨﻲ و اﻗﺘﺼﺎدی اﺳﺘﻔﺎده از ﺳﺎزهﻫﺎی ﭘﺎرﭼﻪای در ﭘﺴﺖﻫﺎی ﻓﻮق ﺗﻮزﻳﻊ
ﻣﻬﺪی ﺗﺪﻳﻦ، ﻣﺤﻤﺪ ﺷﻴﺦ زاده، اﻟﻬﺎم وﻃﻦ ﺧﻮاه

ﭼﻜﻴﺪه
در اﻳﻦ ﺗﺤﻘﻴﻖ ﺑﺎ ﻣﻌﺮﻓﻲ و ﺑﺮرﺳﻲ اﻧﻮاع ﻣﺨﺘﻠﻒ ﺳﺎزهﻫﺎی ﭘﺎرﭼﻪای، اﺳﺘﻔﺎده از اﻳﻦ روش ﺑﺮای ﺳﺎﺧﺘﻤﺎﻧﻲ ﻧﻤﻮدن ﭘﺴﺖﻫﺎی ﻓﻮق ﺗﻮزﻳﻊ ﻣﻮرد ﻣﻄﺎﻟﻌﻪ ﻗﺮار ﮔﺮﻓﺘﻪ اﺳﺖ. ﺑﺎ اﻳﻦ ﺷﻴﻮه ﻣﻲﺗﻮان ﻣﺰاﻳﺎی اﺣﺪاث ﭘﺴﺖﻫﺎی ﻓﻮق ﺗﻮزﻳﻊ ﺑﻪ ﺻﻮرت ﺳﺎﺧﺘﻤﺎﻧﻲ را ﺑﺎ اﺣﺪاث در ﻓﻀﺎی آزاد اﺟﺘﻤﺎع ﻧﻤﻮده، ﻫﺰﻳﻨﻪ را ﻛﺎﻫﺶ داده و ﺑﻪ وﺿﻌﻴﺖ ﻣﻄﻠﻮب دﺳﺖ ﻳﺎﻓﺖ. در ﻣﻄﺎﻟﻌﺎت ﻓﻨﻲ و اﻗﺘﺼﺎدی ﺻﻮرت ﮔﺮﻓﺘﻪ ﺗﻼش ﺷﺪه اﺳﺖ ﺟﻮاﻧﺐ ﻣﺨﺘﻠﻒ ﻣﺴﺄﻟﻪ ﺑﻪ ﺻﻮرت واﻗﻌﻲ ﺑﺮرﺳﻲ ﺷﻮد .
واژهﻫﺎی ﻛﻠﻴﺪی: ﭘﺴﺖﻫﺎی ﻓﻮق ﺗﻮزﻳﻊ، ﺳﺎزهﻫﺎی ﭘﺎرﭼﻪای، ﺳﺎزهﻫﺎی ﻫﻮاﻳﻲ، ﺳﺎﺧﺘﻤﺎن ﭘﺴﺖ

ادامه مطلب ...

ﻧﮕﺮﺷﻲ ﻧﻮﻳﻦ ﺑﺮ ﺳﺎزهﻫﺎی ﭘﺎرﭼﻪای ﺑﺎ ﺗﻜﻴﻪ ﺑﺮ ﺗﻠﻔﻴﻖ ﻋﻠﻮم

ﻧﮕﺮﺷﻲ ﻧﻮﻳﻦ ﺑﺮ ﺳﺎزهﻫﺎی ﭘﺎرﭼﻪای ﺑﺎ ﺗﻜﻴﻪ ﺑﺮ ﺗﻠﻔﻴﻖ ﻋﻠﻮم ﻣﻬﻨﺪﺳﻲ
 اﻟﻬﺎم وﻃﻦ ﺧﻮاه، ﻣﺤﻤﺪ ﺷﻴﺦ زاده
ﭼﻜﻴﺪه
در اﻳﻦ ﻣﻘﺎﻟﻪ ﺑﻪ ﻣﻄﺎﻟﻌﻪ و ﺑﺮرﺳﻲ ﺳﺎزهﻫﺎی ﭘﺎرﭼ ﻪای (ﭘﻮﺳﺘﻪای) ﭘﺮداﺧﺘﻪ ﻣﻲ .ﺷﻮد ﻗﺪﻣﺖ اﺳﺘﻔﺎده از ﺳﺎزهﻫﺎی ﭘﺎرﭼﻪای ﺑﻪ ﻫﺰاران ﺳﺎل ﭘﻴﺶ ﺑﺎز ﻣﻲﮔﺮدد و اﺳﺘﻔﺎده از آﻧﻬﺎ ﺑﻪ ﻋﻨﻮان ﭘﻮﺳﺘﻪﻫﺎی ﺳﺎﺧﺘﻤﺎﻧﻲ ﺑﻪ ﻣﻨﻈﻮر ﺑﻨﺎﻫﺎی ﻣﻮﻗﺘﻲ و داﺋﻢ ﺑﻪ ﺷﺪت رو ﺑﻪ ﮔﺴﺘﺮش اﺳﺖ. اﻳﻦ ﺳﺎزهﻫﺎ در اﺷﻜﺎل و اﺑﻌﺎد ﻣﺨﺘﻠﻒ ﻗﺎﺑﻞ ﻃﺮاﺣﻲ ﻫﺴﺘﻨﺪ و ﻗﺎﺑﻠﻴﺖ ﭘﻮﺷﺎﻧﺪن ﺳﻄﻮح ﺑﺰرگ را دارﻧﺪ ﻛﻪ اﻳﻦ ﻣﺸﺨﺼﻪ ﻳﻜﻲ از ﻣﻬﻢﺗﺮﻳﻦ ﻣﺰاﻳﺎی ﺳﺎزهﻫﺎی ﭘﺎرﭼﻪای ﻣﺤﺴﻮب ﻣﻲﺷﻮد و ﺳﺒﺐ اﺳﺘﻔﺎده روز اﻓﺰون از اﻳﻦ ﺳﺎزهﻫﺎ ﺷﺪه اﺳﺖ .ﺷﻨﺎﺧﺖ دﻗﻴﻖ اﻳﻦ ﺳﺎزهﻫﺎ ﺑﻪ ﻋﻨﻮان ﻳﻚ ﺳﺎزه ﻋﻤﺮاﻧﻲ ﻧﻴﺎزﻣﻨﺪ داﺷﺘﻦ درک ﻋﻤﻴﻘﻲ از رﻓﺘﺎر ﻣﻨﺴﻮﺟﺎت ﻣﻲﺑﺎﺷﺪ. در واﻗﻊ، ﻋﻤﻠﻜﺮد ﻣﻄﻠﻮب اﻳﻦ ﺳﺎزهﻫﺎ در ﮔﺮو ﺗﻠﻔﻴﻖ ﺻﺤﻴﺢ ﻋﻠﻮم ﻣﻬﻨﺪﺳﻲ ﻧﺴﺎﺟﻲ، ﻋﻤﺮان و ﻣﻌﻤﺎری ﻣﻲﺑﺎﺷﺪ. در اﻳﻦ ﻣﻘﺎﻟﻪ ﺳﻌﻲ ﻣﻲﺷﻮد ﺑﻪ اﻳﻦ ﺳﺎزهﻫﺎ ﺑﻪ ﻋﻨﻮان ﻳﻚ ﺳﺎزه ﻧﺴﺎﺟﻲ و ﻧﻴﺰ ﻳﻚ ﺳﺎزه ﻋﻤﺮاﻧﻲ ﺑﻄﻮر ﻫﻤﺰﻣﺎن ﻧﮕﺮﻳﺴﺘﻪ ﺷﻮد .
واژهﻫﺎی ﻛﻠﻴﺪی: ﺳﺎزهﻫﺎی ﭘﺎرﭼﻪای، ﺳﺎزهﻫﺎی ﻫﻮاﻳﻲ، ﺳﺎزهﻫﺎی ﻛﺸﺸﻲ

ادامه مطلب ...

On the Capillary Wicking Behavior of Spunlace Nonwoven

On the Capillary Wicking Behavior of Spunlace Nonwoven
F. Hajiani, A.A. Jeddi, M. Hosseini, N. Ansari
Abstract Nowadays the use of spunlace nonwoven as absorbent products is increasing. Considering the wide usage of these fabrics in different fields such as wipers, hygienic products, wet handkerchiefs, baby diapers, the subject of wetting and capillary wicking in these products is greatly important. In this research the effect of spunlace nonwoven structure on wicking behavior of water has been studied. Twelve different nonwoven samples consisting of 70% viscous/ 30% PET fiber with different weights (35, 40, 45,50g/m2) and water jet pressures (60, 70, 80 bar) were produced. An electrical resistance technique has been developed to study the rate of horizontal wicking of water into nonwoven samples, based on Lucas-Washburn Equation. The study shows that in the nonwoven samples, the wicking distance and penetration rate decrease due to increasing of water jet pressure (WJP) and sample weight. It reveals that increasing sample weight and production WJP, change capillary spaces of samples. It has been possible to study equivalent geometric factor of capillary spaces during wicking measurement of water into nonwoven samples. The radius of open channels in the nonwoven sample tend to decreases as a result of increasing weight of samples and water jet pressure in production nonwoven sample.
 Keywords: nonwoven, spunlace, wicking, water jet pressure, sample weight.

ادامه مطلب ...

تاثیر ﺳﺎﺧﺘﺎر ﻣﻨﺴﻮج بی ﺑﺎﻓﺖ ﺑﺮ اﻧﺪازه ﻣﻨﺎﻓﺬ ﻣﻮﻳﻴﻨﻪ

تاثیر ﺳﺎﺧﺘﺎر ﻣﻨﺴﻮج بی ﺑﺎﻓﺖ ﺑﺮ اﻧﺪازه ﻣﻨﺎﻓﺬ ﻣﻮﻳﻴﻨﻪ

 ﻋﻠﻲ اﺻﻐﺮ اﺻﻐﺮﻳﺎن ﺟﺪی ، ﻓﺮﻳﺪه ﺣﺎﺟﻴﺎﻧﻲ، ﻣﺤﻤﺪ ﺣﺴﻴﻨﻲ ورﻛﻴﺎﻧﻲ  ، ﻧﺎﻫﻴﺪ اﻧﺼﺎری

ﭼﻜﻴﺪه
از ﺟﻤﻠﻪ ﻛﺎﻻﻫﺎی ﻣﻮرد ﺗﻮﺟﻪ در ﺻﻨﻌﺖ ﻧﺴﺎﺟﻲ ﺑﻲﺑﺎﻓﺖ اﺳﺖ. اﻣﺮوزه ﻳﻜﻲ از روشﻫﺎی ﺗﻮﻟﻴﺪ ﺑﻲﺑﺎﻓﺖ اﺳﭙﺎن ﻟﻴﺲ اﺳﺖ. ﺑﺎ ﺗﻮﺟﻪ ﺑﻪ ﻛﺎرﺑﺮد ﮔﺴﺘﺮده اﻳﻦ ﻣﻨﺴﻮﺟﺎت در زﻣﻴﻨﻪ ﻫﺎی ﻣﺨﺘﻠﻒ ﻣﺎﻧﻨﺪ ﭘﺎکﻛﻨﻨﺪهﻫﺎ، اﻧﻮاع ﻣﺤﺼﻮﻻت ﺑﻬﺪاﺷﺘﻲ،
دﺳﺘﻤﺎل ﻫﺎی ﻣﺮﻃﻮب، ﻛﺎﻻﻫﺎی ﭘﺰﺷﻜﻲ وﺑﻴﻤﺎرﺳﺘﺎﻧﻲ و... ، ﺟﺬب ﻣﻮﻳﻴﻨﮕﻲ، ﻧﮕﻬﺪاری و اﻧﺘﻘﺎل ﻣﺎﻳﻌﺎت دراﻳﻦ ﻣﺤﺼﻮﻻت از اﻫﻤﻴﺖ وﻳﮋه ای ﺑﺮﺧﻮردار اﺳﺖ. ﻟﺬا در اﻳﻦ ﭘﮋوﻫﺶ ﺗﺄﺛﻴﺮ ﺳﺎﺧﺘﺎر ﺑﻲ ﺑﺎﻓﺖ ﺑﺮاﻧﺪازه ﻣﻨﺎﻓﺬ ﻣﻮﻳﻴﻨﻪ، ﺟﺬب و ﻧﮕﻬﺪاری ﻣﺎﻳﻌﺎت ﻣﻮرد ﺑﺮرﺳﻲ ﻗﺮار ﮔﺮﻓﺖ. ﺑﻪ اﻳﻦ ﻣﻨﻈﻮر ﻧﻤﻮﻧﻪﻫﺎی ﺑﻲﺑﺎﻓﺖ در ﭼﻬﺎر وزن در واﺣﺪ ﺳﻄ (ﺢ g/m2)
45،40،30و 50 و ﺳﻪ ﻓﺸﺎر ﺟﺖ آب (80،70،60 (bar از ﺟﻨﺲ 70% وﻳﺴﻜﻮز و 30% ﭘﻠﻲ اﺳﺘﺮ، ﺗﻬﻴﻪ ﺷﺪ . ﺳﭙﺲ ﺑﺎ اﺳﺘﻔﺎده از ﺗﺠﻬﻴﺰات آزﻣﺎﻳﺸﮕﺎﻫﻲ، ﻣﻴﺰان اﺑﻘﺎ آب در ﻣﻨﺴﻮج، ﻧﻔﻮذ آب در راﺳﺘﺎی ﻋﻤﻮدی ﻧﻤﻮﻧﻪ ﻫﺎ و ﺑﻪ دﻧﺒﺎل آن ﻓﺎﻛﺘﻮر ﺳﺎﺧﺘﺎر ﻫﻨﺪﺳﻲ ﻣﻨﺴﻮج ﻣﺤﺎﺳﺒﻪ ﮔﺮدﻳﺪ .
ﻧﺘﺎﻳﺞ آزﻣﺎﻳﺸﺎت ﻧﺸﺎن داد ﻛﻪ اﻓﺰاﻳﺶ وزن واﺣﺪ ﺳﻄﺢ و ﻓﺸﺎر ﺟﺖ آب در ﻫﻨﮕﺎم ﺗﻮﻟ ،ﺪﻴ ﺳﺎﺧﺘﺎر ﻫﻨﺪﺳ ﻲ و اﻧﺪازه
ﻓﻀﺎ ﻳﻴﻣﻮ ی ﻨﻪ ﻣﻨﺴﻮج را ﺗﻐ ﻲﻣ ﺮﻴﻴ دﻫﺪ و ﺷﻌﺎع ﻛﺎﻧﺎل ﻫﺎ ی ﺑﺎز در ﺑ ﻲ ﺑﺎﻓﺖ ﻛﺎﻫﺶ ﻣ ﻳﻲ ﺎﺑﺪ. ﺑﻪ دﻧﺒﺎل آن و ﺑﺎ ﺗﻮﺟﻪ ﺑﻪ
 ﺞﻳﻧﺘﺎ ﺗﺠﺮﺑ ،ﻲ ﻛﺎﻫﺶ در ﻣﻴ ﺰان اﺑﻘﺎ آب در ﻣﻨﺴﻮج ﻧ ﺰﻴ ﻣﺸﺎﻫﺪه .ﺷﺪ
واژه های کلیدی: ﺑﻲ ﺑﺎﻓﺖ، ﻓﺸﺎر ﺟﺖ، وزن واﺣﺪ ﺳﻄﺢ، ﺟﺬب ﻣﻮﻳﻴﻨﮕﻲ، ﻣﻨﺎﻓﺬ ﻣﻮﻳﻴﻨﻪ، اﺑﻘﺎء آب

ادامه مطلب ...

ﻣﺪﻟﺴﺎزی ﺗﺄﺛﻴﺮﺿﺮﺑﻪ و رﻓﺘﺎر ﻛﻤﺎﻧﺶ ﭘﺲ از ﺿﺮﺑﻪ در ﻳﻚ ﺻﻔﺤ

ﻣﺪﻟﺴﺎزی ﺗﺄﺛﻴﺮﺿﺮﺑﻪ و رﻓﺘﺎر ﻛﻤﺎﻧﺶ ﭘﺲ از ﺿﺮﺑﻪ در ﻳﻚ ﺻﻔﺤﻪ ﻛﺎﻣﭙﻮزﻳﺘﻲ
  ﻫﻮﺷﻨﮓ ﻧﺼﺮﺗﻲ , ﻣﻬﺪی اﺧﺒﺎری ، ﻣﻬﺮداد ﻣﺤﻤﺪﻳﺎن ، ﻋﻠﻴﺮﺿﺎ اﻣﻴﺮﺷﺎﻫﻲ
ﭼﻜﻴﺪه
ﻛﻤﺎﻧﺶ ﭘﺪﻳﺪه ای اﺳﺖ ﻣﻜﺎﻧﻴﻜﻲ ﻛﻪ در اﻏﻠﺐ ﻣﻮاد و ﻛﺎرﺑﺮدﻫﺎ، رخ دادﻧﻲ اﺳﺖ. رﻓﺘﺎر ﻛﻤﺎﻧﺸﻲ ﻣﻮاد ﺑﻪ دﻻﻳﻞ دﻳﮕﺮی ﻧﻴـﺰ ﻣـﻲ ﺗﻮاﻧـﺪ ﻣﻮرد ﺗﻮﺟﻪ ﻗﺮار ﮔﻴﺮد. از ﺟﻤﻠﻪ اﻳﻦ ﻣﻮارد ﻣﻲﺗﻮان ﺑﻪ روش اﻧﺪازهﮔﻴﺮی ﻣﻘﺎوﻣﺖ ﭘﺴﻤﺎﻧﺪ ﻛﻤﺎﻧﺸﻲ ﭘﺲ از ﺿﺮﺑﻪ، ﺑﻪ ﻣﻨﻈﻮر ﺗﻌﻴﻴﻦ اﻓﺖ ﺧﻮاص ﻣﻜﺎﻧﻴﻜﻲ ﻧﺎﺷﻲ از ﺿﺮﺑﻪ، اﺷﺎره ﻛﺮد. اوﻟﻴﻦ ﺗﺄﺛﻴﺮ زود ﻫﻨﮕـﺎم ﺿـﺮﺑﺎت اوﻟﻴـﻪ، ﻛـﺎﻫﺶ اﺳـﺘﺤﻜﺎم ﻋﻤـﻮﻣﻲ ﺳـﺎﺧﺘﺎر و ﺧﺼﻮﺻـﺎً اﺳﺘﺤﻜﺎم ﻓﺸﺎری آن ﻣﻲﺑﺎﺷﺪ. ﺑﻨﺎﺑﺮاﻳﻦ آزﻣﺎﻳﺶﻫﺎی ﻛﻤﺎﻧﺶ ﭘﺲ از ﺿﺮﺑﻪ ﻣﻲﺗﻮاﻧﺪ ﺟﻬﺖ ﺑـﺮآورد ﻛـﺎﻫﺶ اﺳـﺘﺤﻜﺎم ﻧﺎﺷـﻲ از ﺿـﺮﺑﻪ، ﻣﻮرد ﺗﻮﺟﻪ ﻗﺮار ﮔﻴﺮد. ﺑﺮآورد ﻣﺤﺎﺳﺒﺎﺗﻲ ﺗﺄﺛﻴﺮ ﺿﺮﺑﻪ ﺑﺮ ﺳﺎﺧﺘﺎر، ﻛﻤﺎﻧﺶ ﻗﺒـﻞ و ﺧﺼﻮﺻـﺎً ﺑﻌـﺪ از ﺿـﺮﺑﻪ ، از ﭘﻴﭽﻴـﺪﮔﻲ ﻫـﺎی ﺧﺎﺻـﻲ ﺑﺮﺧﻮردار اﺳﺖ ﭼﺮا ﻛﻪ اﺛﺮ ﺿﺮﺑﻪ اﺑﺘﺪا ﺧﻮد را ﺑﻪ ﺻﻮرت ﺗﺮک ﻣﺎﺗﺮﻳﺲ، ﺳﭙﺲ ﺗﻮرق و در ﻧﻬﺎﻳﺖ ﮔﺴﻴﺨﺘﮕﻲ اﻟﻴـﺎف، ﻧﺸـﺎن ﻣـﻲ دﻫـﺪ . ﺑﺮرﺳﻲ ر ﻓﺘﺎر ﻛﻤﺎﻧﺸﻲ ﺻﻔﺤﺎت ﻛﺎﻣﭙﻮزﻳﺘﻲ در ﺷﺮاﻳﻂ ﻣﺨﺘﻠﻒ، ﺗﻮﺳﻂ ﻣﺤﻘﻘﻴﻦ زﻳﺎدی اﻧﺠﺎم ﺷﺪه اﺳﺖ، اﻣﺎ در ﺗﺤﻘﻴﻘﺎت اﻧﺠـﺎم ﺷـﺪه ﺑﺮای ﻣﺪلﺳﺎزی رﻓﺘﺎر ﻛﻤﺎﻧﺸﻲ ﺻﻔﺤﺎت ﻛﺎﻣﭙﻮزﻳﺘﻲ ﺿﺮﺑﻪ ﺧﻮرده، ﻛﻤﺘﺮ ﻣﻲﺗﻮان ﺑﻪ روش واﺣﺪی در ﺑﻴﻦ آنﻫﺎ دﺳﺖ ﻳﺎﻓﺖ. ﺗﺤﻘﻴـﻖ ﺣﺎﺿﺮ ﺑﻪ ﺑﺮرﺳﻲ اﻳﻦ ﻣﻮارد در ﻳﻚ ﺻﻔﺤﻪ ﻛﺎﻣﭙﻮزﻳﺘﻲ ﺷﻴﺸﻪ/ﭘﻠﻲ اﺳﺘﺮ ﭘﺮداﺧﺘﻪ اﺳﺖ. در اﻳﻦ ﺗﺤﻘﻴﻖ ﺳﻌﻲ ﺧﻮاﻫﺪ ﺷﺪ ﺑﺎ اﺳـﺘﻔﺎده از ﻣﻌﺎدﻻت و ﻧﺮماﻓﺰارﻫﺎی ﺗﻌﻴﻴ ﻦ ﺧﻮاص ﻣﺎده و ﻫﻤﭽﻨﻴﻦ ﻧﺮماﻓﺰارﻫﺎی ﻣﺪلﺳﺎز در ﺗﻌﻴﻴﻦ روﻧﺪ ﺗﻐﻴﻴﺮ ﺧـﻮاص ﻣﻜـﺎﻧﻴﻜﻲ ﻣـﺎده، رﻓﺘـﺎر ﻛﻤﺎﻧﺸﻲ و ﺗﺤﺖ ﺿﺮﺑﻪ و ﻛﻤﺎﻧﺶ ﭘﺲ از ﺿﺮﺑﻪ آنﻫﺎ، ﭘﻴﺶﺑﻴﻨﻲ ﮔﺮدد .
واژه ﻫﺎی ﻛﻠﻴﺪی: ﻛﺎﻣﭙﻮزﻳﺖ، ﻣﺪلﺳﺎزی، ﻛﻤﺎﻧﺶ، ﺿﺮﺑﻪ

ادامه مطلب ...

Relation between Bending Modulus and Fiber Orientation of Non-wo

Relation between Bending Modulus and Fiber Orientation of Non-woven Fabrics
Reza Saghafi*, Mohammad Ghane, Mohammad Zarrebini and Dariush Semnani
Abstract:
Needle-Punching process is the main mechanical method used for increasing the strength of fibrous web. The increase in strength is due to an increase in the degree of fiber entanglement within the fibrous web. In this work, the effect of needle-punching parameters such as punch-density and needle penetration depth on bending properties of needled fabrics has been investigated by assessing fiber orientation. Four samples of needle-punched fabrics were produced using appropriate Carding/Cross-lapping machines. The orientation of the fibers in the samples was determined by use of Radon transform of images of the samples. Bending stiffness of the samples in both machine direction and cross-machine direction were determined by using Simple cantilever system method. Results indicate that an increase in amount of punch-density generally leads to variation in orientation of the fibers in the fabrics along its principle directions. It was also found that an increase in the amount punch-density causes a corresponding increase in fiber orientation in machine direction; additionally it was found that the amount of punch- density affects the bending modules of the fabrics. It is therefore concluded that the amount of punch-density profoundly influence the properties of needle-punched fabrics.
Key Words: Assessment, Radon Transformation, Orientation, Needle-Punched Fabric, Fiber

ادامه مطلب ...

ﺑﺮرﺳﻲ رﻓﺘﺎر ﻓﺸﺎرﭘﺬﻳﺮی ﭘﺎرﭼﻪﻫﺎی ﺳﻪﺑﻌﺪی ﺣﻠﻘﻮی ﺗﺎری ﺗﺤ

ﺑﺮرﺳﻲ رﻓﺘﺎر ﻓﺸﺎرﭘﺬﻳﺮی ﭘﺎرﭼﻪﻫﺎی ﺳﻪﺑﻌﺪی ﺣﻠﻘﻮی ﺗﺎری ﺗﺤﺖ ﺗﺎﺛﻴﺮ ﺑﺎرﮔﺬاری اﺳﺘﺎﺗﻴﻜﻲ و دﻳﻨﺎﻣﻴﻜﻲ
 ﺳﻴﺎﻣﻚ ﻓﺮﺟﻲ ﺧﻮاه، روح اﷲ ﺑﺎﻗﺮزاده،ﻣﺴﻌﻮد ﻟﻄﻴﻔﻲ  ، ﺳﻌﻴﺪ ﺷﻴﺦزاده ﻧﺠﺎر
ﭼﻜﻴﺪه
در اﻳﻦ ﺗﺤﻘﻴﻖ، ﺗﺄﺛﻴﺮ ﺿﺨﺎﻣﺖ و ﺗﺮاﻛﻢ ﭘﺎرﭼﻪﻫﺎی ﺳﻪ ﺑﻌﺪی ﺣﻠﻘﻮی ﺗﺎری ﺑﺮ ﺧﻮاص ﻓﻴﺰﻳﻜﻲ و ﻣﻜﺎﻧﻴﻜﻲ آنﻫﺎ ﺑﺮرﺳﻲ و ﺑﺎ ﺗﻮﺟﻪ ﺑﻪ ﻣﺪلﻫﺎی ﻓﻴﺰﻳﻜﻲ ـ ﻣﻜﺎﻧﻴﻜﻲ اراﺋﻪ ﺷﺪه ﺑﺮای ﺑﻴﺎن رﻓﺘﺎر ﻓﺸﺎرﭘﺬﻳﺮی ﭘﺎرﭼﻪﻫﺎ ﻧﺘﺎﻳﺞ ﺑﺪﺳﺖ آﻣﺪه ﻣﻮرد ارزﻳﺎﺑﻲ ﻗﺮار ﮔﺮﻓﺖ. ﺑﺪﻳﻦ ﻣﻨﻈﻮر ﺷﺶ ﻧﻤﻮﻧﻪ ﻣﺨﺘﻠﻒ از اﻳﻦ ﭘﺎرﭼﻪﻫﺎ ﻛﻪ دارای دو ﺿﺨﺎﻣﺖ (3 ﻣﻴﻠﻲﻣﺘﺮ و 5 ﻣﻴﻠﻲﻣﺘﺮ) و ﻫﺮ ﺿﺨﺎﻣﺖ دارای ﺳﻪ ﺗﺮاﻛﻢ ﻣﺨﺘﻠﻒ ( 17 ،14 و 20 رج در ﺳﺎﻧﺘﻲ ﻣﺘﺮ) ﺑﻮدﻧﺪ ﺗﻮﺳﻂ ﻣﺎﺷﻴﻦ راﺷﻞ دو ﻣﻴﻠﻪ ﺳﻮزن ﺗﻮﻟﻴﺪ ﺷﺪﻧﺪ. ﻫﻤﭽﻨﻴﻦ ﺗﺄﺛﻴﺮ ﺗﻐﻴﻴﺮ ﺿﺨﺎﻣﺖ و ﺗﺮاﻛﻢ اﻳﻦ ﭘﺎرﭼﻪﻫﺎ ﺑﺮ وزن واﺣﺪ ﺳﻄﺢ، ﭼﮕﺎﻟﻲ، ﺿﺨﺎﻣﺖ ﺗﺤﺖ ﺑﺎر و ﻣﺪول ﺧﻤﺸﻲ آنﻫﺎ ﻧﻴﺰ ﻣﻮرد ﻣﻄﺎﻟﻌﻪ ﻗﺮار ﮔﺮﻓﺖ .ﺑﺎ ﺗﻮﺟﻪ ﺑﻪ ﻧﺘﺎﻳﺞ آزﻣﺎﻳﺸﺎت ﺑﻪ ﻋﻤﻞ آﻣﺪه و ﺗﺠﺰﻳﻪ و ﺗﺤﻠﻴﻞ آﻣﺎری ﺻﻮرت ﮔﺮﻓﺘﻪ ﻣﻲﺗﻮان ﻋﻨﻮان ﻧﻤﻮد ﻛﻪ در ﺗﺮاﻛﻢ ﺛﺎﺑﺖ ﺑﺎ اﻓﺰاﻳﺶ ﺿﺨﺎﻣﺖ، ﺟﻬﻨﺪﮔﻲ ﻳﺎ ﺑﺎزﮔﺸﺖﭘﺬﻳﺮی ﭘﺎرﭼﻪ ﺑﻴﺶﺗﺮ و ﻫﻴﺴﺘﺮزﻳﺲ آن ﻛﻤﺘﺮ ﻣﻲﮔﺮدد. ﻫﻤﭽﻨﻴﻦ ﺑﺎ ﻛﺎﻫﺶ ﺿﺨﺎﻣﺖ ﭘﺎرﭼﻪﻫﺎی ﺳﻪﺑﻌﺪی ﻣﺪول ﺧﻤﺸﻲ اﻓﺰاﻳﺶ ﻣﻲﻳﺎﺑﺪ. در ﺣﺎﻟﻲ ﻛﻪ در ﻳﻚ ﺿﺨﺎﻣﺖ ﺛﺎﺑﺖ، ﺗﻐﻴﻴﺮات ﺗﺮاﻛﻢ ﺗﺄﺛﻴﺮی ﺑﺮ ﻫﻴﺴﺘﺮزﻳﺲ و ﺑﺎزﮔﺸﺖﭘﺬﻳﺮی ﻧﺪارد. ﺑﺎ ﺗﻮﺟﻪ ﺑﻪ ﻣﺪل ﻣﻜﺎﻧﻴﻜﻲ اراﺋﻪ ﺷﺪه ، در ﻳﻚ ﺗﺮاﻛﻢ ﻣﻌﻴﻦ، ﭘﺎرﭼﻪای ﻛﻪ دارای ﺿﺨﺎﻣﺖ ﺑﻴﺶﺗﺮی ﻣﻲﺑﺎﺷﺪ، ﻧﺴﺒﺖ ﺗﻐﻴﻴﺮات ﺿﺨﺎﻣﺘﺶ در ﻣﻘﺎﺑﻞ اﻓﺰاﻳﺶ ﻧﻴﺮو ﺑﻴﺶﺗﺮ ﻣﻲﺑﺎﺷﺪ .
واژهﻫﺎی ﻛﻠﻴﺪی: ﭘﺎرﭼﻪ ﺳﻪﺑﻌﺪی ﺣﻠﻘﻮی ﺗﺎری، رﻓﺘﺎر ﻓﺸﺎرﭘﺬﻳﺮی، ﺑﺎزﮔﺸﺖﭘﺬﻳﺮی، ﻫﻴﺴﺘﺮزﻳﺲ

ادامه مطلب ...