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468:. A series of patents had been issued in the late 19th century for perforation machines to be used on rail lines for ticketing. Libraries and private collections used similar perforating stamps to mark ownership of books. End sheets, title pages, and image plates were punched with the namesake of the collection. Today, similarly elaborate perforation patterns continue to be used in
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films, cold perforation can cause slitting rather than creating a round hole, which can jeopardize the material's integrity under pressure. The solution to this is often heating the pin; i.e. hot pin perforation. Hot perforation melts a hole in the material, causing a reinforced ring around the
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can place many precise holes in a web. Laser perforations look similar in many respects to hot needle perforations. However, laser systems are expensive. The big advantage of laser perforation is the consistency of the hole size, compared to mechanical perforation. This is very important in
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in paper and similar materials. The punch and die are shaped to produce the desired shaped hole. The clearance (the distance between the outside circumference of the punch and the inner circumference of the die) must be properly maintained to ensure a clean cut.
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Bread bags for some bread often have micro-perforations in the plastic, which is supposed to keep the bread fresh by releasing excess moisture. Similarly, bags of concrete use small perforations to allow air to escape while they are being filled.
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are sealed with a ring at the bottom of the cap attached by perforation. Twisting the cap has the effect of rupturing the material between the perforations and indicating that the original seal has been broken.
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Rotary pinned perforation rollers are precision tools that can be used to perforate a wide variety of materials. The pins or needles can be used cold or heated. Cold perforation tools include needle punches.
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or plastic film is easy for consumers to open. Other purposes include filtrating fluids, sound deadening, allowing light or fluids to pass through, and to create an aesthetic design.
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is a small hole in a thin material or web. There is usually more than one perforation in an organized fashion, where all of the holes collectively are called a
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377:. Perforations on stamps are rather large, in the order of a millimeter, in comparison other perforated materials often have smaller holes.
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input and output devices in some cases were perforated to ensure correct positioning of the card in the device, and to encode information.
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hole. Hot needle perforation also assists when high density pin patterns are utilized, as the heat aids the perforation of the material.
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There are a handful of manufacturers that specialize in hot and cold needle perforation tooling and equipment. In materials that have
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Die and punch sets can be used for thicker materials or materials that require large holes; this process is the most common for
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Perforations are usually used to allow easy separation of two sections of the material, such as allowing
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Perforation frequently refers to the practice of creating a long series of holes or slits so that
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are perforated to allow it to be moved precise distances at a time continuously. Similarly,
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machines (slitter rewinder) as the printed material is slit down to the finished roll size.
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are one common application of this, where small round holes are cut in lines to
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this can result in a "volcano" hole that is preferred in many applications.
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to have perforations making it easier to tear out individual pages or
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can be torn more easily along a given line: this is used in easy-open
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are produced on the side of the workpiece that is against the die.
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Historically, perforation patterns other than linear were used to
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Pinned rollers can be made from a variety of materials, including
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for fresh produce. The laser perforation is often carried out on
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Perforation of steel strips is used in the manufacture of some
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Todd, Robert H.; Allen, Dell K.; Alting, Leo (1994),
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584:"Weight of cement bags reduced by BSW Machinery"
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519:, Industrial Press Inc., pp. 103–104,
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127:Learn how and when to remove this message
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27:(Making) a small hole in a thin material
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545:Library History Round Table (LHRT)
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32:Perforation (disambiguation)
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588:World Cement
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549:. Retrieved
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491:Punched tape
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59:Please help
54:verification
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18:Perforations
466:mark stamps
442:for use in
402:graph paper
164:perforating
160:perforation
156:perforation
602:Categories
551:2017-06-08
497:References
436:film stock
398:loose leaf
390:legal pads
242:elasticity
204:barriers.
183:paperboard
145:US Postage
87:newspapers
448:computers
416:Screwcaps
386:notebooks
365:packaging
208:Processes
179:Packaging
480:See also
410:confetti
361:plastics
262:In more
257:aluminum
117:May 2010
618:Braille
455:zesters
404:from a
281:sheared
264:brittle
249:plastic
101:scholar
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394:leaves
255:, and
148:stamps
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459:rasps
444:looms
357:paper
298:Burrs
285:punch
253:steel
202:vapor
198:sound
175:paper
108:JSTOR
94:books
521:ISBN
457:and
388:and
307:and
293:chad
200:and
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168:tool
80:news
359:or
289:die
63:by
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