Ethan Clarke
Golf balls have come a long way since the early days of the sport, when the Romans played with feather-stuffed balls. Modern golf balls are made of a variety of materials, including plastic. The type of plastic used in golf balls is typically a thermoplastic known as an ionomer resin, which is a type of synthetic rubber. This plastic is heated and injected into a mould to form the outer shell of the ball, which hardens as it cools. The plastic shell is then polished and painted, before being stamped with a logo and given a glossy coating. The dimples on a golf ball are created during the moulding process and are essential to the ball's performance, impacting its speed, flight, spin and overall performance.
| Characteristics | Values |
|---|---|
| Composition | Modern golf balls are made of two to four components: styrene butadiene rubber (SBR) or foamed polyurethane (PU) for the inside, and specialised resins such as magnesium ionomers for the outside. |
| Core | Made of strong rubber or synthetic rubber. |
| Outer Covering | Made of thermoplastic, also known as ionomer resin or Surlyn (a thin plastic resin created and trademarked by DuPont). |
| Manufacturing Process | Golf balls are made using injection moulding or compression moulding techniques. Molten thermoplastic ionomer is injected into the mould, and the plastic solidifies and hardens to form the dimpled shape and size of the finished ball. |
| Dimples | Dimples are created during the moulding process and impact the ball's flight, speed, lift, and spin. They increase the ball's aerodynamic properties by manipulating the airflow to create a tighter vortex, decreasing drag and increasing distance, speed, and lift. |
| Spin | The spin of the ball is influenced by its core and cover materials. Urethane covers deliver higher spin rates, providing more control in the short game. |
| Distance | Distance is influenced by the core and cover materials. Surlyn contributes to distance but inhibits spin. |
| Durability | Urethane is a slightly softer and less durable material than Surlyn. |
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What You'll Learn
Golf ball covers are made of Surlyn or Urethane
Surlyn, a thin plastic resin created and trademarked by DuPont, is often the choice for three-piece balls as it produces more spin, resulting in greater control. It is an ionomer resin that provides superior protection against scuffing of the cover from mis-hits and cart paths.
Urethane, on the other hand, is a slightly softer and less durable synthetic compound. It is an inert material that can be moulded extremely thin, allowing for increased velocity and distance. Urethane covers are typically more expensive and tend to deliver higher spin rates, providing more control, especially in the short game.
The choice between Surlyn and Urethane depends on the desired performance traits. Surlyn contributes to distance but inhibits spin, while Urethane offers higher spin rates and more control. Golf ball manufacturers can tweak these cover materials to achieve the desired initial velocity, spin rate, and compression for their products.
The cover is a crucial aspect of golf ball construction, and its stiffness plays a significant role in the ball's performance. It must be stiff enough to efficiently utilise the energy generated and achieve long distances, but not too stiff to avoid cracking easily. This compromise between stiffness and durability is achieved through the use of Surlyn or Urethane, which have distinct properties that cater to different performance requirements.
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The core is made of rubber
Golf balls have undergone a long process of transformation since the game was first played in 80 BC. The Romans played with soft balls made of feathers, while in the 1400s, when the game became popular worldwide, balls were carved from wood. The first rubber golf balls were made in the 1800s, and today, natural and synthetic rubber are the main materials used in their construction.
The core of a golf ball is made of strong rubber. The core is the ball's engine, storing the energy that will be released on impact with the golf club. It influences the ball's speed, distance, and spin. The core can be solid rubber or liquid-filled, and it is surrounded by one or several outer layers. The modern two-piece ball is created by surrounding a spherical core made of rubber or synthetic rubber with a hard covering. The core is placed into a mould where hot plastic is injected to surround the rubber centre and harden, forming a dimpled coating.
The dimpled design of golf balls is an important factor in their performance. The indentations make golf balls more aerodynamic, manipulating the airflow around the ball to create a tighter vortex that effectively decreases the ball's drag and increases its distance, speed, and lift. Manufacturers can manipulate the size, quantity, and pattern of the dimples to impact the ball's speed, flight, spin, and overall performance.
The exterior surface of the golf ball is referred to as its cover and is constructed of either Surlyn, a thin plastic resin created and trademarked by DuPont, or Urethane, a slightly softer and less durable synthetic compound. Surlyn is often used for three-piece balls as it produces more spin (control), while Urethane is moulded extremely thin so as not to impede velocity (distance). Both materials provide superior protection against scuffing of the cover.
The manufacturing process of golf balls involves injecting molten thermoplastic ionomer into a mould cavity, where it sticks to the core and takes on the dimpled shape and size of the finished ball. As the plastic solidifies and cools, the ball is removed from the mould. An automated milling machine then removes any excess plastic to polish the ball, leaving it smooth and free of imperfections. The balls are then checked for quality before being painted, stamped with a logo, and given a glossy coating.
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The cover is made of thermoplastic
The cover of a golf ball is typically made of thermoplastic, a type of plastic that can be moulded when heated and becomes rigid when cooled. This process is known as injection moulding, where the molten thermoplastic is injected into a mould cavity under high pressure and temperature. As the plastic solidifies and cools, it hardens, forming the dimpled outer shell of the golf ball.
Thermoplastic is an ideal material for golf ball covers due to its durability and ability to withstand impact. The cover must be stiff enough to contain the energy generated by the core during flight, but not so stiff that it cracks easily. Thermoplastic provides the necessary balance between stiffness and flexibility, ensuring the ball can withstand the forces of being struck by a golf club and maintain its integrity during flight.
The specific type of thermoplastic used for golf ball covers is often an ionomer resin, such as Surlyn or Urethane. Surlyn, developed by the DuPont Company, is a popular choice for three-piece golf balls as it produces more spin, resulting in increased control. Urethane, on the other hand, is a slightly softer and more expensive material that delivers higher spin rates, providing golfers with more control, especially in the short game.
The dimples on a golf ball are not just for show; they play a crucial role in the ball's flight, speed, lift and spin. These dimples create a tighter vortex, reducing drag and increasing distance, speed and lift. Manufacturers can manipulate the size, quantity and pattern of these dimples to fine-tune the performance characteristics of the ball, ensuring it meets the needs of different golfers and playing conditions.
The manufacturing process of golf balls involves a series of steps to ensure quality and precision. Once the thermoplastic cover is moulded and cooled, excess plastic is removed, and the ball is polished to perfection. It then undergoes a quality check, where its uniformity and finish are inspected. If it passes, the ball moves on to the labelling stage, where robotic arms imprint the necessary stamps and symbols. After painting and drying, some balls receive a final coating of polyurethane to protect the ink and specifications.
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Modern golf balls use plastic and rubber
Modern golf balls are a far cry from the soft, feather-stuffed balls used by the early Roman emperors. Today, golf balls are made using a combination of plastic and rubber.
The golf ball has undergone a long transformation to become the type of ball it is today. The balls have changed from leather and feather constructions to the plastic and rubber creations we see on the course now. Modern golf balls require both rubber and plastic in their construction. The core is made of strong rubber, while the hard outer shell is made of a thermoplastic, also known as an ionomer resin cover. This resin is a DuPont product called Surlyn. Surlyn is a plastic resin that is used to produce more spin or control. Urethane is another option for the cover, which is moulded extremely thin so as not to impede velocity or distance.
The core of a golf ball is where the energy is stored that will be released upon impact with the golf club. The cover is also an important component, as it must be stiff enough to make the best use of the energy generated, but not so stiff that it cracks easily. The dimples on the golf ball are created during the manufacturing process and help the ball fly further and reach greater distances. The dimples manipulate the airflow around the ball to create a tighter vortex, decreasing drag and increasing distance, speed, and lift.
The number of layers in a golf ball can vary, with two-piece and three-piece balls being the most common. The two-piece ball has a rubber or synthetic rubber core with a hard plastic covering. Three-piece balls have a smaller rubber core, sometimes liquid-filled, surrounded by rubber thread, and then covered with an ionomer resin. The three-piece balls tend to have a higher spin rate, which gives the golfer more control.
The golf ball has come a long way since its early days, and modern balls are a testament to the innovation and engineering that goes into their design and construction.
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The cover is the most important part
The dimples on the cover of a golf ball play a crucial role in its flight, speed, lift, and spin. Compared to a smooth ball, the small indentations make golf balls more aerodynamic, creating a tighter vortex that decreases drag while increasing distance, speed, and lift. Manufacturers can manipulate the dimples' size, quantity, and pattern to influence the ball's speed, flight, spin, and overall performance. This manipulation allows for consistency in the ball's performance across various weather and playing conditions.
The cover of a golf ball is the result of a complex manufacturing process. After the core is created, it undergoes injection moulding or compression moulding to form the outer cover. Molten thermoplastic ionomer is injected into the cavity during injection moulding, bonding the shell material to the core and creating the dimpled shape and size of the finished ball. In contrast, compression moulding involves inserting the ionomer shell into a mould consisting of two hollow hemispheres.
The cover is essential to the performance of a golf ball. Golf ball manufacturers tweak the cover's design and construction to achieve desired performance traits such as increased distance, control, and feel. The cover works in conjunction with the core and the mantle to deliver the best possible golf ball performance for the golfer's game. The cover's stiffness is critical, as it must be able to withstand the energy generated within the ball during flight without cracking.
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Frequently asked questions
The plastic used for golf balls is called thermoplastic, also known as ionomer resin.
Ionomer resin is a type of plastic resin created by the DuPont Company. It is also known as Surlyn.
Surlyn is a thin plastic resin used for the exterior surface or cover of golf balls. It is often used for three-piece balls as it produces more spin and control.
Modern golf balls are made of natural and synthetic rubber, styrene butadiene rubber (SBR), foamed polyurethane (PU), and specialised resins such as magnesium ionomers.
