Maya Ellison
Fixing broken plastic toys is a great way to save money and reduce waste. There are several methods to repair broken plastic toys, including using glue, soldering irons, friction welding, and applying heat and pressure. The best method depends on the type of plastic and the size of the toy. For example, super glue can be used for small, fiddly repairs, while soldering irons are useful for thicker plastics. With the right tools and techniques, broken plastic toys can be easily mended and restored to their former glory.
How to stick a broken plastic toy
| Characteristics | Values |
|---|---|
| Type of glue | Super glue, Bostik Fix & Glue Gel, Bostik Fix & Glue Liquid, Loctite® Epoxy Plastic Bonder, UV curing glue, Surehold Plastic Surgery glue, Hard Plastics glue |
| Other materials | Soldering iron, paper clip, acetone, ABS slurry, baking soda |
| Steps | Clean the area with alcohol, make holes in the broken parts, apply glue, hold the two parts together, let it dry |
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What You'll Learn
Using super glue
Super glue is a popular choice for repairing broken plastic toys. However, not all super glues work for all types of plastic toys, so it is important to read the label before purchasing. Some glues are not suitable for certain plastics, such as polyethylene or polypropylene. You can identify the type of plastic by looking for the label or commonly, the recycling symbol.
Super glues are strong adhesives that dry quickly and can be used straight from the tube. They are easy to apply, and some even come with precise nozzles for accurate application on small areas. To use super glue, simply squeeze the desired amount directly onto the broken area of the toy. Then, hold the two parts of the toy together for a few seconds to create an initial bond. Leave the glue to dry for about a minute to ensure an ultra-strong, long-lasting bond.
If the toy regularly comes into contact with water, it is important to choose a waterproof or water-resistant super glue formulation. Additionally, for flexible plastics, look for a specialised adhesive such as Loctite Vinyl, Fabric & Plastic Flexible Adhesive, which is waterproof and creates a flexible bond.
For a stronger repair, you can combine super glue with other techniques. One method is to use a pin drill to create small holes in both pieces of plastic and insert a paper clip or wire into the holes before gluing. This provides additional structural support. Alternatively, you can use plastic cement glue, which melts the plastic and creates a weld. This method can be combined with super glue for an even stronger bond.
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Drilling holes and using a paper clip
Step 1: Prepare the Plastic Toy
Before you begin drilling, ensure that the broken parts of the toy are securely held in place. You can use a clamp or a vice to hold the pieces together. This step is crucial as it ensures that the drilling is accurate and prevents further damage to the toy.
Step 2: Drill the Holes
Using a pin-drill or a small drill bit, carefully drill holes into the broken pieces of the toy. The holes should be small, approximately 5-7mm in diameter, and directly opposite each other on the broken surfaces. Go slowly and be cautious to prevent melting the plastic. Once the holes are drilled, you may need to remove any excess plastic or debris from the area.
Step 3: Prepare the Paper Clip
Take a standard-sized paper clip and straighten it out. Cut a small piece of the paper clip, approximately 5-7mm in length, using wire cutters. This small piece will act as a connector between the two broken parts of the toy.
Step 4: Insert and Glue the Paper Clip
Apply super glue or plastic weld glue to the paper clip connector. Carefully insert the glued paper clip into the holes you drilled, ensuring that it is securely fastened and held in place by the glue. Allow the glue to cure and dry completely.
Step 5: Final Assembly
If you had to cut off any excess paper clip protruding from the holes, ensure that the remaining part is still glued securely. Apply super glue to the remaining exposed part of the paper clip and attach the other half of the broken toy. Hold the two pieces together for a few seconds to ensure a strong bond. Leave the toy to dry completely before handling it.
This method provides a strong and durable repair to the broken plastic toy. The paper clip acts as an internal connector, providing structural integrity, while the glue holds the pieces together. With these steps, you can give your broken plastic toy a new lease of life!
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Soldering iron
When choosing a soldering iron, look for one with a relatively flat tip or one that can be flattened. This will help you smooth out the plastic after welding. You can also make your own tip if you're feeling creative. Some irons have a settable temperature, which is useful if you are concerned about the toxicity of fumes from the plastic. Alternatively, you can make a plug connected to a dimmer to reduce the iron's power and temperature.
Before you start, ensure you are in a well-ventilated area to avoid inhaling any noxious fumes from the plastic. Wear protective eyewear, and consider wearing a respirator or breathing mask. It is also a good idea to clean the tip of the iron with a damp sponge to remove any residue from past projects.
To fix the toy, start by applying super glue or high-strength plastic glue to the broken edges of the plastic. Press the edges together and apply constant pressure for 30 seconds. You can also tape or clamp the pieces together to keep them in place while the glue dries. Once the glue is dry, use the soldering iron to melt the edges of the plastic, which will fuse the pieces together. Move the iron quickly to avoid burning the plastic. You can also use the iron to smooth out the surface by passing it over any weld beads.
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Friction welding
To friction weld a broken plastic toy, you will need a friction welder with a styrene or plastic welding rod. You can either purchase a plastic friction welder or make your own using a cheap DC rotary tool. If you are making your own, ensure that the power supply is adequate, as a low-powered tool will not generate enough heat to melt the plastic.
Once you have your friction welder, follow these steps:
- Ensure that the plastic pieces you are joining are clean and dry.
- If necessary, cut or sand the edges of the broken pieces to create a smooth surface for welding.
- Select a welding rod that is compatible with the type of plastic you are welding. You can identify the plastic type by the number printed inside three arrows on the toy.
- Spin the welding rod at a high RPM (rotations per minute) and press it against the joint between the two plastic pieces. The friction will melt the plastic of the pieces being joined and the welding rod, creating a strong bond.
- Continue applying pressure and moving the welding rod along the joint until the pieces are fully joined.
- Allow the plastic to cool and harden, forming a strong weld.
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Hard plastics glue
Fixing broken plastic toys can be a simple task, depending on the type of plastic used in the toy. It is important to note that different types of plastics require different types of glue. For instance, flexible plastics commonly used in household items such as toys are best fixed with Loctite Vinyl, Fabric & Plastic Flexible Adhesive. This type of adhesive is a clear liquid that is waterproof, dries clear, and creates a flexible bond that won't break down under UV/sunlight exposure.
For rigid plastic toys, Bostik's Hard Plastics Glue is recommended. This type of glue is perfect for tough jobs that require an ultra-strong, long-lasting, and water-resistant bond. It is applied white but dries clear, making it suitable for most rigid plastic items made from PVC-U, ABS, and High Polystyrene.
Another option for fixing broken plastic toys is to use a cyanoacrylate (CA) glue, also known as super glue. However, it is important to note that not all plastics are the same, and the best methods of bonding vary depending on the type of plastic. Some plastics may require a solvent-based bonding, while others may need an epoxy-based adhesive.
Before gluing, it is important to clean the plastic surface with soap, a specialized plastic cleaner, or isopropyl alcohol. This will help minimize oil residue. Sanding the surface with grit sandpaper, steel wool, or emery cloth can also create a rough surface for the glue to bond to.
Once the glue is applied, hold the two parts of the toy together for a few seconds to create an initial bond. Leave the glue to dry for about a minute to ensure a strong and long-lasting bond.
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