缩微胶片衰变现象探析（Analysis of microfilm decay phenomenon）.docVIP

缩微胶片衰变现象探析（Analysis of microfilm decay phenomenon） Since 70s, many departments such as archives, libraries and large enterprises have made a great deal of microfilm in the books, archives and documents. However, due to the lack of film, or because of poor processing and poor storage conditions, some have produced significant decay. There are three genes acetate cellulose acetate hydrolysis acidification form vinegar syndrome; because of the impurity and the environment like silver emulsion layer in the formation of peroxide redox spots; preservation microfilm polyester substrate often fluctuations in temperature and humidity environment, the emulsion layer and film stripping, observed in the micro reader to Newtons ring; yellow silver mirror phenomenon and the low density parts in high density parts of silver images; the emulsion layer shaped and mildew stains appear spread form mildew etc.. This paper only redox spot, Newton ring and oil like the formation mechanism and influencing factors was analyzed. A preliminary study on the causes, like the Newton ring and oil. A unit of polyester based on microfilm produced on 1992 from A to Z observed Newton ring special phenomenon. A false, concentric, dark, or rainbow pattern in a photograph or film, called a Newtons ring. Such phenomena are generally due to improper in India Gate when the pressure gap between negative and positive, negative smooth base surface reflection light and reflection light interference and the formation of positive color ring spot. See the Newton ring in the microfilm reader on the screen, there are about 3 reasons: (1) generation reader optical system, such as optical lens appear open slot. In this case, the Newton ring is basically fixed on the screen, but the Newton ring we observe moves along with the film. This phenomenon eliminated the reader; (2) when printing printing machine gate pressure resulting from improper Newton ring in the film, but on a black and white film is black and white ri