User:ENCPROJ./Tennis ball

Article Draft
Initial research questions

What type of felt is a tennis ball?

-Tennis balls felts are comprised of wool, nylon, and cotton in a mixture that surrounds the rubber edge. "Tennis Impact/Uniform Variety"

How much air in a tennis ball/ o2??

-A tennis ball will have generally have 12 more psi (pounds per square inch) of a nitrogen and oxygen mix than the sea level ambient air pressure (University of Illinois at Urbana-Champaign The Grainger College of Engineering Physics Van)(Tennis Companion)

Why do tennis balls lose bounce when opened

-Tennis balls lose bounciness because the air inside the ball is pushing harder when a can is opened compared to when a ball is packaged. When packaged, the pressure in the can equally pushes the ball from the outside as the air in the inside of the balls, therefore preserving the pressure inside. When a tennis ball is unpackaged, its frequent use allows for air to escape from the ball. "labmate"

Different sizes/pressures of tennis balls? (Green level/dot/// orange//// red)

-Green level balls usually have 7 more psi than the sea level ambient air pressure"oncourtoffcourt"

In 1926, the Pennsylvania Rubber Company released a hermetically sealed pressurized metal tube that held three balls with a churchkey to open the top?

Beginning in the 1980s, plastic (from recycled PET) cans with a full-top pull-tab seal and plastic lid fit three or four balls per can.?

Tennis ball recycling?

Possible add-ins found while researching

Premium Tennis balls (Wilson Double Core/ Penn Tennis Masters Series/ Dunlop Abzorber)-FELT FORUM. By: Martin, James, Tennis, 00403423, May2002, Vol. 38, Issue 4

Extra/Regular Duty-FELT FORUM. By: Martin, James, Tennis, 00403423, May2002, Vol. 38, Issue 4

Originally, tennis ball manufacturing was done by compressing vulcanized rubber into the form similar to that of a three-leaf clover. Before the formation of the rubber into a sphere (which was executed via machinery), chemicals that create a gas were added to produce pressure into the hollow inside once the sphere was assembled. "HISTORY OF TENNIS BALLS"

Tennis balls were initially entirely made of rubber, but they were later refined by using flannel and stitching it around the core, which used to be fully filled with rubber. The tennis ball quickly switched to having a hollow core, using gas to pressurize the inside. "HISTORY OF TENNIS BALLS"

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