Editing Perforation (section)

===Pins and needles===
[[Image:Controlcard-crop.jpg|thumb|left|"Volcanic" perforations made with a needle punch]]
[[Image:Orientatiepaalperforatorpinnetjes Silva 433.JPG|thumb|right|A needle punch used in [[orienteering]]]]

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.

There are a handful of manufacturers that specialize in hot and cold needle perforation tooling and equipment. In materials that have [[Elasticity (physics)|elasticity]] this can result in a "volcano" hole that is preferred in many applications.

Pinned rollers can be made from a variety of materials, including [[plastic]], [[steel]], and [[aluminum]].

In more [[brittle]] 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 hole. Hot needle perforation also assists when high density pin patterns are utilized, as the heat aids the perforation of the material.