Helena Frye
The inside of a basketball is made up of several components, each serving a specific function. The basketball's spherical shape and bouncy, elastic properties are made possible by its inner structure. The bladder, usually made of butyl rubber, is the heart of the basketball, holding air and giving the ball its bounce. The carcass, made of polyester and nylon threads, sits just beneath the outer layer, protecting the inner parts and maintaining the ball's shape. The outer covering is typically made of synthetic rubber, rubber, composition, or leather, with leather being the traditional choice.
| Characteristics | Values |
|---|---|
| Shape | Spherical |
| Size | 28.5-30 inches (72-76 cm) in circumference |
| Weight | 18-22 oz (510-624 g) |
| Covering | Leather, rubber, composition, synthetic or polyurethane leather |
| Inner bladder | Butyl rubber |
| Carcass | Polyester, nylon or cotton thread |
| Valve | Plastic tube |
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What You'll Learn
The bladder
The manufacturing process of the bladder is also important. The butyl rubber is heated and extruded to create a thin, flexible tube, which is then inflated and placed inside the carcass. The bladder is then glued and sealed, and the ball is inspected for any gaps or imperfections. This process ensures that the basketball can hold air and maintain its shape and performance characteristics over time.
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The carcass
The use of these materials in the carcass adds durability and resistance to deformation, ensuring that the basketball can withstand the rigours of the game. The carcass plays a vital role in maintaining the structural integrity of the basketball, allowing it to retain its shape and performance characteristics.
To access and observe the carcass, one must cut open the basketball, which will damage it beyond repair. It is recommended to use a cheap outdoor basketball made of rubber for this purpose, starting the cut from a thinner section of the carcass, such as the paint lines extending from the valve.
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The outer covering
The outer surface of the ball is divided by ribs that are recessed below the surface in various configurations and are generally a contrasting colour. An orange surface with black ribs and a possible logo is the traditional colour scheme, but basketballs are sold in various colours.
Before the ball is ready for use, it undergoes a manufacturing process. The bladder/carcass is covered with a coating of glue and placed inside a vulcanizer, which is lined with the cover panels. After the ball emerges, decals and foil decoration and information are applied by hand with small heat presses. The ball is then fitted into another vulcanizer that unifies the finished surface, blending in any gap fillers, and is specially moulded to form the surface pebbling.
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The valve
In older balls, the bladder could be patched and repaired by taking it out of the carcass, but this is not possible with most modern basketballs. The carcass is the layer just below the outer covering of the ball, made of polyester threads wound around the ball along with nylon threads. The outer covering of a basketball can be made of synthetic rubber, rubber, composition, or leather.
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The thread winding
Nylon 6-6 is the most commonly used thread for the windings due to its strength and durability. Its high tensile strength and abrasion resistance make it ideal for improving the ball's performance and extending its lifespan. The manufacturing process of Nylon 6-6 involves breaking down large hydrocarbon molecules into smaller ones through a process called "cracking." This process produces benzene and propylene, which, through a series of chemical reactions, lead to the creation of Nylon 6-6 through the polycondensation of adipic acid and hexamethylene diamine.
The raw Nylon 6-6 is then heated, melt-extruded, and spun into a strong nylon thread. This thread is then wound tightly around the bladder, providing crucial structural integrity to the basketball.
While some basketballs use only nylon for the windings, others incorporate polyester threads as well. Polyester can comprise anywhere from 0 to 40% of the thread used for the carcass. It is produced through a process called polymerization, with crude oil, coal, water, and air being the primary materials. Similar to nylon, polyester is heated and extruded into thin fibers, which are then spun into polyester threads.
The combination of nylon and polyester threads in the windings gives the basketball optimal performance characteristics, ensuring it can withstand the demands of the game while maintaining its shape and bounce.
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Frequently asked questions
The inside of a basketball consists of a bladder (a balloon-like structure that holds air) and the carcass. The carcass is made of polyester and sits just below the outer layer of the ball.
The bladder is made of butyl rubber and holds the air inside the ball. It is the heart of the basketball and gives the ball its bounce.
The carcass consists of treads of nylon or polyester. It protects the inner parts of the ball and gives it its spherical shape.
The outer covering of a basketball is made of synthetic rubber, rubber, composition, or leather. Recreational basketballs often use synthetic leather covers such as polyurethane leather, which is more durable and weather-resistant than real leather.
To see what's inside a basketball, you will have to tear it open with a knife, razor, or scissors. This will damage the ball beyond repair, so it is recommended to use a cheap outdoor basketball made of rubber.
