The act of perforating, or of boring or piercing through.
A hole made by boring or piercing; an aperture.
1.) the rows of holes between stamps that enable easy separation of stamps. The gauge (perforation size) has frequently changed. For example, perf 15 was introduced in 1857, perf 12 in 1861, perf 10 in 1914, and perf 11 in 1917. Other perfs have also been used. "Perf" is a common contraction for perforation. 2.) the holes that were privately added by some private companies to help coil stamps pass through a machine.
a series of cuts or holes manufactured on a form to weaken it for tearing. A perforation can be described by how it is made (press perforation, machine perforation), by the cutting device used (blade perforation, wheel perforation), by its direction on the finished form (cross perforation, vertical perforation), or by its function (stub perforation, between-set perforation).
a hole in the wall of an organ.
A series of cuts or holes on a sheet to make tearing easy
Perforation takes place on a binder machine, creating a line of small dotted holes that make it easy to tear off a part of printed material.
An abnormal opening (hole) in the wall of the bowel that causes the contents of the bowel to spill into the abdominal cavity.
A hole in a paper player piano roll. (See Using the QRS Test Roll - click here)
A method of making holes through the casing opposite the producing formation to allow the oil or gas to flow into the well. See the Gun perforation.
A pattern of small holes punched or bored into the trim of a shoe, for the purpose of decoration or ventilation.
A series of holes punched between stamps in the sheet to ease separation.
n: a hole made in the casing, cement, and formation through which formation fluids enter a wellbore. Usually several perforations are made at a time.
A pierced row of holes to facilitate tearing.
Holes of precise dimensions/spacing pressed into paper for ease of separating.
a line of small holes for tearing at a particular place
the act of punching a hole (especially a row of holes as for ease of separation)
a hole in the ear drum
a hole in the septum
a hole in the wall of the digestive tract
a hole through which the contents of the esophagus can pass into
a small hole that can occur if one of the instruments used by the surgeon damages the wall of the woman's uterus
Holes punched to let out air or let glue in
a hole or series of holes made through a substance.
An injury to the wall of the uterus; it can be caused by an intrauterine device or by an instrument used in a D&C.
Holes punched in the casing of a well at the resevoir zone to allow fluids to enter the well at a specific zone of the resevoir. A Perforating Gun is a cylindrical tool loaded with explosive charges which are triggered opposite the required production zone, perforating the casing in many places.
A "hole" or concavity in a vital tissue (tooth structure). If caused by nature, it is the result of an erosive process.
an abnormal opening or tear in the wall of the bowel that allows intestinal contents to enter the abdomen.
A hole in something
The punching out of holes between stamps to make separation easy. (1) Comb perforation-three sides of a stamp are perforated at once, with the process repeated in rows. (2) Harrow perforation-the entire sheet or unit of stamps is perforated in one operation. (3) Line perforation-holes are punched one row at a time. Line perforations are distinguished by the uneven crossing of perforation lines and irregular corners. Comb and harrow perforations usually show alignment of holes at the corners. Some forms of perforation may be difficult to distinguish.
A hole in an organ, such as the gastrointestinal tract.
A hole in the intestine that permits the flow of intestinal contents into the abdominal cavity.
an abnormal opening in the bowel wall which causes the contents of the bowel to spill into the normally sterile abdominal cavity.
Formation of a hole in the bowel wall, allowing intestinal contents to enter the abdominal cavity.
Process of making a hole, or the hole itself.
Holes punched in the casing of a well at the pay zone to be produced, to allow oil or gas to enter the well. A Perforating Gun is a cylindrical tool loaded with explosive charges which are triggered opposite the pay zone, perforating the casing in many places.
A perforation is an abnormal opening in the wall of the bowel which occurs when an area of the wall becomes weakened, and the contents of the bowel are spilled into the abdominal cavity.
A series of small holes formed in a shrink band to make the band easier to remove. See â€œvertical perforationâ€ and â€œhorizontal perforation
A hole in a hollow organ such as the stomach or the intestine
The making of holes in casing and cement (if present) to allow formation fluid to enter the well bore. One common method of perforating is by shooting holes through the casing by means of a special gun lowered into the hole. Others use shaped charges to penetrate the casing and up to 36â€ into the surrounding formation. Permeability: A measure of the resistance offered by rock to the movement of fluids through it. It is measured in darcies or milledarcies. Porosity: Porosity measures the capacity of the rock to hold oil, gas or water. It is measured in bulk percentage of the volume of rock. go back
A hole or break through a membrane or the wall of an organ.
A perforation is a hole made by puncturing a surface. However, the term frequently refers to the practice of creating a long series of holes so that paper can be torn more easily. Postage stamps are one common application of this, where small round holes are cut in lines to create individual pieces (see postage stamp separation).