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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.
Top of a copper clad Perfboard with solder pads for each hole. Perfboard is a material for prototyping electronic circuits.It is a thin, rigid sheet with holes pre-drilled at standard intervals across a grid, usually a square grid of 0.1 inches (2.54 mm) spacing.
"Loose leaf" describes any kind of paper or book that is available in single sheets, unbound. Its "leaves", or sheets, are "loose" and not bound in notebook or book form. In North America, some textbooks are sold with prepunched holes and perforated pages, so that users can remove the pages and store them in a typical 3-ring binder.
A partial image of a sheet of US Postage stamps, 1940 issue, featuring perforations. A perforation 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 perforation.
A grommet is a ring or edge strip inserted into a hole through thin material, typically a sheet of textile fabric, sheet metal or composite of carbon fiber, wood or honeycomb. Grommets are generally flared or collared on each side to keep them in place, and are often made of metal, plastic, or rubber. They may be used to prevent tearing or ...
Studies have shown that perforated metals help reduce sound levels. [4] Studies have shown that having buildings use perforated metal sheets in front of their façade can bring in one study 29% energy savings (HVAC + Lighting estimated consumption in 1 year) and in the second one 45% energy savings (heating, ventilation, air conditioning).
These photos tell the story of 2024's most impactful weather.
Metal laboratory sieves An ami shakushi, a Japanese ladle or scoop that may be used to remove small drops of batter during the frying of tempura ancient sieve. A sieve, fine mesh strainer, or sift, is a tool used for separating wanted elements from unwanted material or for controlling the particle size distribution of a sample, using a screen such as a woven mesh or net or perforated sheet ...