
Plastic cups with ridges have been a topic of discussion, with some speculating on their purpose. While some believe the ridges are for measuring liquids, the cup manufacturers have refuted this, stating they are solely for functional reasons. These ridges provide structure to the cup, making it easier to grip and hold, and also play a role in the manufacturing process, aiding in printing and preventing cups from sticking together.
| Characteristics | Values |
|---|---|
| Purpose of ridges | Improving grip, providing structure to the cup, and making the edge softer on the lips |
| Manufacturing | Used to rotate the cup during printing |
| Stacking | Prevent cups from getting stuck against each other |
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What You'll Learn

Ridges improve grip and provide structure
Plastic cups with ridges have been a common sight at parties and cookouts. The iconic red Solo cup, for example, has ridges that improve grip and provide structure. While there have been rumours that these ridges were intended to measure cocktail ingredients or standard serving sizes of liquor, wine, and beer, the company has denied these claims. They assert that the ridges are solely for functional reasons, improving grip and providing structure to the cup.
The plastic that rolls back on itself on the edge of plastic cups makes the edge softer on the lips and provides structure to the cup. If you cut it off, you will notice how soft the cup becomes when you try to hold it. The ridges have a similar effect.
The ridges on the original Solo cups do correspond with the standard serving sizes of liquor (1.5 oz.), wine (5 oz.), and beer (12 oz.). However, according to the company, this is merely a coincidence, and the ridges were not designed for measuring alcohol.
In addition to improving grip, the ridges on plastic cups also serve a functional purpose during the manufacturing process. These ridges are known as "deco lugs" and are used to align the cup during manufacturing, such as when a label is being applied. They also prevent the cups from making a full seal, which could cause them to get stuck together due to the vacuum seal.
The presence of ridges on plastic cups is thus a functional design feature that improves grip and provides structure, while also serving specific purposes during the manufacturing process.
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Notches aid printing and manufacturing
Plastic cups with ridges or notches have various purposes. One of the primary reasons for their design is to aid in the printing and manufacturing processes.
The notches on the bottom of plastic cups are essential for printing because many plastic cups feature logos or designs. These notches provide a way to rotate the cup during the printing process, ensuring that the graphics are accurately applied. They also serve as alignment markers during manufacturing, especially when labels or designs need to be positioned precisely.
Additionally, the notches aid in the manufacturing process by preventing the cups from creating a full seal. This prevents the cups from getting stuck together due to a vacuum seal. The notches, sometimes called "deco lugs" or "nesting lugs", also ensure that when the cups are stacked, they do not stick tightly against each other, making them easier to separate.
While the notches have functional purposes in printing and manufacturing, they may also have been left over from the manufacturing process. These notches could be remnants from joining two halves of the cup together or from creating an air hole, contributing to the stability of the cup.
The ridges on plastic cups, specifically the original Solo cups, have been the subject of speculation as well. Some people believe that the ridges correspond to standard serving sizes for liquor, wine, and beer. However, the company maintains that the ridges are solely for improving grip and are not intended as measurement guides.
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Remnants of manufacturing processes
The ridges on plastic cups are likely remnants of the manufacturing process. One reason could be that they provide a way for the plastic to escape from the mould during production, acting as a turning mechanism to prevent the cups from getting stuck together due to a vacuum seal. These ridges also allow the cups to be turned during the printing of graphics or logos. Additionally, they may serve as "nesting lugs," ensuring that stacked cups do not stick tightly against each other.
The ridges on plastic cups also have functional benefits. They improve the cup's grip and provide structure, making it easier to hold. This added structure prevents the cup from becoming too soft and difficult to handle. While some have speculated that the ridges on specific cup designs, such as the original Solo cup, were intended for measuring liquids, the company has denied this. They assert that the ridges were included solely for functional purposes, such as improving grip.
The presence of ridges on plastic cups can also be attributed to the manufacturing process, specifically the moulding technique used to create the cups. During the production process, the plastic is formed and shaped using moulds, and the ridges may be a byproduct of this process. The moulds can leave impressions or marks on the plastic, resulting in the formation of ridges.
Furthermore, the manufacturing process may also involve the use of specific techniques or machinery that leave behind these ridges. For example, the use of rollers or presses during the forming or cutting stages of production could create these ridged patterns. The presence of ridges can also be a result of the cooling and solidification process of the plastic. As the plastic cools, it may contract or change shape slightly, leading to the formation of ridges along the surface.
While the ridges on plastic cups may seem like a minor detail, they serve multiple purposes, including structural integrity, improved grip, and ease of manufacturing. These ridges are a subtle yet functional element of the overall design, ensuring that the cups are both practical and efficient for their intended use.
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Ridges as measurement guides for drinks
While the iconic red Solo cups are a common sight at parties, not many know why these plastic cups have ridges. Some rumours suggest that the ridges on the original Solo cups were intended to be used as measurement guides for cocktails or standard serving sizes of liquor, wine, and beer. Interestingly, the ridges on the original Solo cups do correspond with the standard serving sizes of liquor (1.5 oz.), wine (5 oz.), and beer (12 oz.). However, according to the company that manufactures these cups, the ridges are not meant to be used as a guide for measurement. Instead, they serve functional purposes, such as improving the cup's grip and providing structure.
The presence of ridges on plastic cups can be traced back to their manufacturing process. These ridges provide a lot of structure to the cup, and without them, the cup would become very soft and difficult to hold. Additionally, during the manufacturing process, these ridges help to prevent the cups from making a full seal, which could otherwise cause them to get stuck together due to the vacuum seal.
The history of the red Solo cup is intriguing. Before modern science discovered germs and how they spread, communal drinking cups were common. However, once it was understood that sharing cups also meant sharing germs and diseases, disposable cups made from paper or plastic emerged as a solution. The Paper Container Manufacturing Company eventually produced the now-iconic red Solo cup, which gained popularity due to its use in drinking games like beer pong and its cultural significance in songs like Toby Keith's "Red Solo Cup."
While the rumours about the ridges on plastic cups being measurement guides may not be accurate, it is fascinating to see how these disposable cups have become such a staple at parties and gatherings, even gaining a cult-like following. The ridges on the cups may have been designed for functional purposes, but they have unintentionally created a unique connection between the cups and the concept of social drinking, whether it be for cocktails, liquor, wine, or beer.
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Softening the cup's edge
One of the reasons plastic cups have ridges is to make the cup's edge softer on the lips. The bit of plastic that rolls back on itself on the edge of plastic cups softens the edge and also provides structure to the cup. If this rolled-up bit of plastic is cut off, the cup becomes very soft and loses its structure. The ridges have a similar effect and help maintain the cup's shape.
The ridges on plastic cups also improve the cup's grip. They prevent the cup from slipping out of one's hand. Interestingly, the ridges on the original Solo cups correspond with the standard serving sizes of liquor (1.5 oz.), wine (5 oz.), and beer (12 oz.). However, the company that makes the cups has denied this, stating that the ridges are strictly for functional reasons and are not meant to be a guide for measurement.
The ridges also help during the manufacturing process. They prevent the cups from making a full seal, thereby preventing them from getting stuck together due to the vacuum seal. Additionally, they allow the cups to be turned during manufacturing as needed, such as when printing graphics or applying labels.
Overall, the ridges on plastic cups serve multiple purposes, including softening the cup's edge, improving grip, and aiding in the manufacturing process.
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Frequently asked questions
Plastic cups have ridges to improve grip and provide structure to the cup.
No, according to the company that manufactures the cups, the ridges are not meant to be a guide for measurement.
The ridges on plastic cups can also be used to stack the cups without them getting stuck together.

















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