Alexei Volkov
Warped plastic model parts can be frustrating to deal with, but there are a few methods to straighten them out. One common technique is to use hot water to soften the plastic, then reshape it and hold it in place until it cools down. This can be done with hot tap water or boiling water, depending on the thickness of the part. It's important not to heat the plastic too much, as it may melt or leave fingerprints. Another method is to use a hairdryer to heat the part and then reshape it, again running it under cold water to hold its form. For more severely warped parts, it may be necessary to use tools like clamps or rubber bands to hold the part straight while it cools.
| Characteristics | Values |
|---|---|
| Temperature of water | Hot water (around 120°F) to soften the plastic, then cold water to hold its form |
| Tools | Hair dryer, rubber bands, bamboo tongs |
| Plastic type | Styrene |
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What You'll Learn
Use hot water to soften the plastic
When dealing with warped plastic model parts, one method to straighten them out is to use hot water to soften the plastic. This technique has been used to straighten styrene parts with success.
To do this, boil a kettle of water until steam starts coming out. Then, use bamboo tongs to hold the plastic in the water. It is important to note that the water must be boiling, as simply hot water may not be effective in softening the plastic. The temperature of the water needs to be high enough to make the plastic flexible. For polystyrene, a common plastic used in models, this temperature is around 95°C.
Once the plastic is softened, you can begin to straighten it. Gently bend the plastic past the point of the desired angle, and then dunk it into a bowl of iced water to set its new shape. It is important to let the plastic cool completely before using it.
While this method can be effective for thinner pieces of plastic, it may not work for thicker, harder pieces. Additionally, it is important to exercise caution when working with hot water and plastic, as some plastics can release harmful fumes when heated. It is recommended to wear a gas mask, safety glasses, and heat-proof gloves when attempting this method.
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Avoid overheating to prevent melting
To straighten plastic model parts, you can use hot water, a hairdryer, or replace the part. When using hot water, it is important to avoid overheating the plastic, which can cause it to melt or become brittle and break. Instead of submerging the part directly in hot water, it is recommended to use a heat-proof container, such as a ceramic tile or a cheap sheet pan, and place it in the oven. Preheat the oven to around 300°F (149°C) and place the container with the plastic part inside. Turn on the oven light and monitor the plastic through the window to avoid overheating. Remove the plastic from the oven once it has softened and before it starts to smoke or burn.
Another method to avoid overheating is to use a hairdryer on a low setting. Hold the hairdryer a few inches away from the plastic and move it continuously until the plastic softens. Be cautious not to overheat the plastic, as it can melt or become damaged.
Additionally, it is important to consider the type of plastic you are working with. Different types of plastics have varying melting points and behaviours when heated. For example, styrofoam should be avoided as it will disintegrate when heated. On the other hand, Polypropylene (PP) plastic, identified by a number 5 in a triangle, can be safely heated and will reconstitute when cooled. Always ensure that the work area is well-ventilated to avoid inhaling hazardous fumes released during the heating process.
To summarise, when straightening plastic model parts, it is crucial to avoid overheating to prevent melting. Use methods like hot water baths, hairdryers on low settings, and ovens with careful monitoring to soften the plastic without overheating. Always identify the type of plastic and its characteristics before applying heat, and prioritise good ventilation to mitigate the risks associated with hazardous fumes.
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Hold in place until the part cools
When straightening plastic model parts, it is important to hold the part in place until it cools to ensure that it retains its new shape. This process involves heating the plastic until it becomes soft and malleable, shaping it into the desired form, and then holding it in place as it cools to maintain that shape.
One common method for achieving this is to use the "'jig' technique. This involves creating a sturdy, heat-resistant jig that can securely hold the plastic part in the desired position as it cools. The jig provides a framework or mould that the plastic conforms to, ensuring it retains the correct shape during the cooling process. By restraining the plastic within the jig, it is prevented from shrinking or flexing back to its original warped state as it cools.
To use the jig technique effectively, first construct a jig that is specifically designed to hold the plastic part in the desired shape. The jig should be made from heat-resistant materials to withstand the hot water or heat application process. Once the jig is ready, soften the plastic part by submerging it in hot or boiling water. The water temperature and soaking time will depend on the thickness and size of the plastic part. As a general guideline, aim for water that is hot enough to soften the plastic without melting it, and soak for a few minutes until the plastic becomes flexible.
After softening the plastic, quickly remove it from the hot water and place it into the jig while it is still pliable. Secure the plastic within the jig to prevent any movement or shifting during the cooling process. Then, submerge the entire assembly—the jig and the plastic part—into the hot or boiling water. This step helps to ensure that the plastic remains soft and flexible while it is firmly restrained in the correct position. Finally, remove the assembly from the heat source and allow it to cool to room temperature. As the plastic cools, it will harden and retain the shape imposed by the jig.
The "hold in place until the part cools" step is crucial in this process because it ensures that the plastic part maintains its new shape. By restraining the plastic within the jig during cooling, you prevent the natural tendency of the plastic to return to its original warped state. This step may require patience, as the cooling process can take several minutes, depending on the size and thickness of the plastic part. However, it is worth the wait to ensure that your plastic model parts are straight and true.
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Use a hairdryer to apply heat
Using a hairdryer is a simple and effective way to straighten bent plastic model parts. It is a convenient method as it is a tool that many people have readily available in their homes.
Firstly, you should be aware that using a hairdryer on plastic can be risky. It is easy to damage the plastic, and you should be cautious and careful when applying heat to plastic. It is recommended to practice on cheap, spare plastic parts before attempting to straighten the piece you want to fix.
To straighten your plastic model parts, turn on your hairdryer and apply heat to the bent area. Keep the hairdryer at a distance from the plastic to avoid burning or bubbling the plastic. Hold the part in the desired position and continue to apply heat until the plastic cools and holds its new shape. You can also use a plate as a deflector to keep the heat focused on the area you want to straighten.
After applying heat, run the plastic under cold water to help it hold its new form. You can also place the plastic between two sheets of glass while it cools to help it retain its shape.
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Clamp the part to hold it straight
Clamping is a useful technique to hold plastic model parts straight while working on them or allowing glue to dry. There are several types of clamps to consider, each with its own advantages and disadvantages.
One option is to use bar clamps, which can be hung on horizontal scraps of 2x4 screwed between open wall studs to keep them organised and within easy reach. Pipe clamps, which are similar to bar clamps, can be used to grip slender and curvy workpieces. However, they may not be long enough for some projects. To address this issue, you can convert a pipe clamp by unscrewing the fixed jaw and reattaching it backward, then reversing the direction of the sliding jaw. This setup can be used to gently break apart joints for repair work.
Another type of clamp to consider is a handscrew, which can grip the board like a long-jawed vise. Handscrews can also be screwed into a piece of plywood to hold doors for edge-planing. If you're working with octagonal pieces, clamping a plywood holder to your table saw's miter gauge will enable you to cut perfect octagons of various sizes.
For projects involving plastic pipes, it is recommended to use plastic PVC pipe clamps to avoid staining or reacting with the glue. Additionally, when gluing plastic pieces together, it is important to select the appropriate glue for the type of plastic you are working with and to clean and roughen the surfaces before applying glue. Once the glue is applied, clamps can be used to hold the pieces firmly together until the adhesive dries.
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Frequently asked questions
You can use hot water to soften the plastic, then hold it in the correct position until it cools and hardens.
The water should be near-boiling, but not so hot that the plastic melts.
You can use a hairdryer to heat up the part, then run it under cold water to hold its new form.
For very warped or thick parts, you may need to repeat the process of softening and reshaping multiple times, cooling the part between each attempt.
If the part is too fragile to be straightened, you may need to replace it with a suitable plastic rod or wooden dowel.
