Omar Khalid
Pulling apart plastic cups that are stuck together can be a frustrating and time-consuming experience. This often happens when cups are stacked while still wet, creating a vacuum or a stubborn seal due to dried liquid. To separate them, various methods can be employed, including using ice and hot water, oil or soap, freezing, or even a hairdryer. Each method aims to utilise the expansion and contraction of the cups, loosening the seal, and allowing for a gentle twist and pull motion to separate the cups successfully.
| Characteristics | Values |
|---|---|
| Cause | Trapped air and moisture in the spaces between stacked plastic cups create suction, which forces the cups together. |
| Solutions | Put a towel or paper towels into the cups so they are against where the 2 edges meet & can hopefully draw out (wick) the water, and place them upside down on another towel. Run the hottest water you can into them, dump the water out, run some dish soap along the edges where they're stuck, and try to twist the smaller one around. Fill the top cup with ice cubes, and submerge the bottom cup in hot water, then twist. Put the cups in the freezer, then put them in your dryer with a blanket for a few minutes. Thread floss tightly between the cups through the narrow gap and move it back and forth in a sawing motion. Put ice cubes in a paper towel and press firmly around the seam of the stuck cups. Lay them on their side and gently tap the top of the cup with your palm, rotate it a little, tap it again and repeat so you are tapping around the rim all the way around. Put some cooking oil or dish-washing liquid between the cups. |
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What You'll Learn
Using ice and hot water
Plastic cups can get stuck together when they are stacked before they have completely dried after washing. The trapped air and moisture in the spaces between the cups create suction, forcing them together. This can be frustrating, but there are a few simple solutions to separate them using ice and hot water.
Firstly, fill the top cup with ice cubes and cold water. Then, submerge the bottom cup in a bowl of hot water. The ice will cause the top cup to contract, while the hot water will cause the bottom cup to expand, making the cups easier to separate. Hold the cups in this position for a few minutes, then twist and pull them apart.
Another method is to run hot water over the outside of the bottom cup, while placing ice cubes in the inner cup. This will also cause the cups to expand and contract, creating space between them, and making them easier to pull apart.
If the cups are still stuck, you can try filling a sink with hot water and submerging the cups. The hot water will cause the bottom cup to expand, while the top cup will contract from the cold water, making them easier to separate.
For stubborn cups, you can try using a lubricant like cooking oil, dish soap, or WD-40. First, ensure that the lubricant gets in between the cups. Then, twist and pull the cups apart. Finally, wash the cups with dish soap to remove any residue.
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Freezing the cups
To use this method, start by filling the top cup with ice cubes or cold water. You can also place the cups in a freezer for a few hours or overnight. This will cause the cups to contract.
Next, submerge the bottom cup in hot water for around three minutes. Alternatively, you can use a hairdryer to blow hot air on the outer cup for 30 seconds. This will cause the bottom cup to expand.
Finally, grasp the cups firmly and pull them apart, twisting them while you apply force. The combination of expansion and contraction should create enough space to easily separate the cups.
This method is a simple and effective way to deal with stuck-together plastic cups without causing any damage. It is important to act quickly once the cups are removed from the freezer, as the temperature difference is critical to the success of this technique.
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Using cooking oil or dish soap
Plastic cups can get stuck together when they are stacked before they are completely dry. This often happens when there is leftover liquid between the cups that dries and creates a stubborn seal. To pull them apart, you can try using cooking oil or dish soap.
Using cooking oil
Pour a small amount of cooking oil, such as olive oil, vegetable oil, canola oil, or sunflower oil, between the cups. Make sure the oil gets in between the sealed cups by covering the entire rim. You can also spritz or drop the oil in two or three places, evenly apart. Wait a few minutes for the oil to seep in. Then, gently twist and wiggle the cups apart. You can also try rotating and tugging the cups to get them apart. Wash the cups with dish soap afterward to remove the oil.
Using dish soap
Pour some dish-washing liquid or dish soap around the rim of the bottom cup. Then, twist the cups to separate them. You can also try running the stack of cups under warm water for a few minutes before adding the dish soap.
If the cups are still stuck, you can try using a combination of hot and cold. Put ice cubes in the top cup and hold the bottom cup under warm water for a few seconds. This will cause the top cup to shrink and the bottom cup to expand, making it easier to pull the cups apart.
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Using dental floss
Plastic cups can get stuck together due to leftover liquid drying between them, creating a stubborn seal. Here is a step-by-step guide on how to separate them using dental floss:
Firstly, take a piece of dental floss and tightly thread it between the cups through the narrow gap. Ensure that the floss is pulled taut. Then, move the floss back and forth in a sawing motion. The thin but strong floss will easily slice through any dried liquid without damaging the cups.
Once you have cut through the perimeter seal, the cups should be almost entirely separated. Now, gently pry the cups apart with light pressure. The cups should come free without any further force or aggression required.
If the cups are still difficult to separate, you can try a variation of the above method. Wrap an ice cube in a paper towel and press it firmly around the seam of the stuck cups. Hold the ice cube in place while it melts, allowing the chilled liquid to seep into the join. This will help to loosen and swell the dried liquid, further weakening the seal. Once the ice has melted, give a light twist while maintaining pressure, and the cups should now release with ease.
This method is an effective way to separate stuck-together plastic cups without causing any damage or deformation to the cups themselves.
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Tapping the cups
First, lay the cups on their side. Then, gently tap the top cup with your palm. Rotate the cups slightly, tap again, and repeat this process so that you are tapping around the rim of the cup all the way around. Eventually, the cups should jiggle and come apart.
If tapping the cups with your palm does not work, try tapping them on a hard surface instead. Place the cups on a table or counter and gently tap the rim of the top cup against the edge of the table or counter. Rotate the cups slightly and repeat the tapping motion around the rim.
It is important to be gentle and patient when using this method. Tapping too hard or too quickly may cause the cups to slip and break.
Additionally, this method may be more effective when combined with other techniques, such as running warm water over the cups or using ice and hot water. These additional steps can help to loosen the seal between the cups, making them easier to separate with gentle tapping.
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Frequently asked questions
Fill the top cup with ice cubes and the bottom cup with hot water. Hold the stuck-together cups in this position for three minutes, then twist them while you pull.
You can try using cooking oil or dish soap between the cups and then twisting them. You can also try tapping the cups gently on a surface or laying them on their side and tapping the top cup with your palm.
Try using a hairdryer on the outer cup for 30 seconds, ensuring that the air doesn't go into the inner cup. You can also try putting the cups in the freezer overnight and then placing them in a bowl of hot water.
Try using dental floss to cut through the seal between the cups. You can also try using WD-40 or a similar lubricant.
