Perforation is a small hole in a thin material or web. Usually there are several perforations in an organized manner, where all the holes are collectively referred to as perforations. The process of creating a perforation is called perforation, which involves piercing a workpiece with a tool.
The punctures are usually used to allow easy separation of the two sections of material, such as allowing the paper to be torn easily along the line. Perforated packaging in cardboard or plastic film is easy to open for consumers. Other goals include filtering fluids, sound deadening, allowing light or fluids to pass through and create an aesthetic design.
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Perforation often refers to the practice of creating a long row of holes or slots so that paper or plastic can be easily torn along a given line: this is used in an easily opened package. Since the creation of perforating devices in the 1840s and 1850s, he has seen use in several areas.
Postage stamps are one of the common uses for this, where small round holes are cut in lines to create individual pieces. Perforation on the dies is quite large, of the order of a millimeter, in comparison with other perforated materials often have smaller holes.
As a rule, checkbooks, notebooks and notebooks for legal documents are perforated, which facilitates the tearing out of individual pages or sheets. Perforation is used in such a way as to separate a loose sheet (or even the form of graph paper from the annular binder). Fine perforation near the rings allows you to separate the page from the book without confetti.
Screw caps on glass or plastic bottles are sealed with a ring at the bottom of the cap attached by perforation. Twisting the cap causes the material to rupture between the perforations and indicates that the original seal was broken.
Perforated punch card
The edges of the film stock are perforated to allow it to be moved accurate distances simultaneously continuously. Similarly, perforated cards for use on looms and later on computers, input and output devices were in some cases perforated to ensure the correct positioning of the card in the device, as well as for encoding information.
Perforation of steel strips is used in the manufacture of some zesters and rasps.
Historically, perforation patterns were not used for marking stamps. At the end of the 19th century, a number of patents for punching machines were issued, which will be used on railway lines for ticket sales. Libraries and private collections used similar punching stamps to indicate ownership of books. End sheets, title pages and graphic plates were punched with the namesake of the collection.  Today, orienteering still uses the same sophisticated perforation patterns.
Bread bags for some types of bread often have microperforations in the plastic, which should keep the bread fresh, releasing excess moisture. in the same way, concrete bags use small perforations to allow air to escape during filling.