Cotton Fabric, Egyptian Cotton, Ultraviolet Radiation, Climatic Conditions In Urban Area

Conclusion

Egyptian cotton fabric were exposed at Alexandria and Helwan city in May 2002 at first and till the end of April 2003 at monthly, 4,8 and 12 months continuous exposure to environmental conditions at these cities. The produced deterioration was assessed by different methods. Thus physical and mechanical changes were studied and evaluated. The environment at Helwan is highly contaminated with a large amount of cement dust and other pollutants and that their effects are very pronounced during summer time and especially in August. Besides, acid mists were also detected there and they were more than in Alexandria city. The whiteness and brightness indices for the exposed fabric decreased continuously with exposure during the whole year. While the yellowness index increased. It is observed that the degradation of the samples exposed in Helwan is higher than that of the samples exposed in Alexandria. This degradation occur due to the high pollution in Helwan city.

There is much degradation in tensile strength and elongation of the samples that were exposed for successive eight months more than that for the samples, which were exposed for four months only. It was found that there is less rate of degradation in samples exposed for more than eight months. The samples exposed in Alexandria had better tensile strength and elongation than that of Helwan in spite of the increase in ultraviolet and total sun hours .This emphasize the effect of pollution in Helwan in degradation of samples.

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About the Authors:

The authors are associated with Textile Department, Faculty of Education in Helwan University and Textile Research Division, National Research Center, Cairo, respectively.

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