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A 35 mm microfilm chip is mounted in the hole inside of a clear plastic sleeve or secured over the aperture with adhesive tape. They are used for engineering drawings in all engineering disciplines. There are libraries of these containing over 3 million cards. Aperture cards may be stored in drawers or in freestanding rotary units.
Three punched pockets. A punched pocket (UK English), plastic wallet (UK English), poly pocket (UK English), slippery fish (Sussex, England), sheet protector (US English), plastic sleeves (AU English), “page protector” (US English), or sometimes perforated document bag, is a flat, slit plastic bag with a perforated edge used to hold paper documents.
Documents with heavy use may be stored or encapsulated in a clear polyester (Mylar) film sleeve or folder. As added protection against acid formation, paper-based storage materials may have a buffer, such as calcium carbonate, which can neutralize acids as they form in the storage materials. [ 52 ]
Polyester sleeves, acid-free folders, and pH buffered document boxes are common supportive protective enclosures whose selection must match the media's chemical and physical properties. [1] Other considerations in preserving paper/books are: Damaging light, particularly UV light, which fades and destroys media over time by breaking down the ...
Others write on adhesive labels that are placed on the tabs. There are also electronic label makers that can be used to make the labels. File folders can be made from plastic or paper. When paper is used, it is preferable that it is made from paper pulp with long cellulose fibre, such as kraft paper or manila paper.
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