Omar Khalid
Plastic toys are everywhere, from building blocks to robots, figurines, and model vehicles. The process of creating plastic toys is complex and involves many steps, but the most common method is injection moulding. This process involves filling hot and mouldable plastic into specific moulds to get a toy part in the desired shape and structure. Other methods include rotational moulding, blow moulding, and using 3D modelling software. The first step in the manufacturing process is to design the toy model, which can be done by a designer or externally at a factory. The next steps depend on the type of toy being created and the materials used, but they all involve melting plastic pellets and injecting them into a mould, which is then cooled to create a solid toy.
| Characteristics | Values |
|---|---|
| First Step | Brainstorming and designing a 3D model of the toy |
| Materials | High-quality plastic toys are usually made of single materials such as ABS, PVC, etc. |
| Molding Techniques | Injection molding, rotational molding, blow molding, air injection |
| Mold Types | Hollow mold, two-part mold, four or more part mold |
| Mold Composition | Metal, plaster, silicone |
| Plastic Type | Thermoplastics, polyethylene, liquid vinyl |
| Plastic Characteristics | Lightweight, colorful, strong, glossy, high hardness and toughness, excellent stability, heat-resistant, wear-resistant, non-toxic, environmentally friendly |
| Advantages of Injection Molding | Cost-effective, large-scale production, high throughput rate, extraordinary strength, low weight, better color utilization, integration of complex designs |
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What You'll Learn
Brainstorming and design
Identify the Purpose and Target Audience:
Understanding the intended use of the toy and the target age group is crucial. For example, is it a doll with moveable limbs, a building block, or a figurine? Considering the target age range ensures the toy is safe and appropriate for its intended users.
Material Selection:
High-quality plastic toys are often made from single materials such as ABS or PVC, which offer advantages like good gloss and colour, high hardness and toughness, and environmental friendliness. The choice of material depends on the desired characteristics and any relevant safety standards or regulations.
Design Complexity and Details:
The level of complexity and detail desired for the toy should be considered. Injection moulding allows for intricate designs and better geometry due to the high pressure applied during the process. If the toy has multiple parts, each piece's design must be carefully planned.
Size and Weight:
Determining the desired size and weight of the toy is important. Injection-moulded toys tend to be hollow, making them lightweight and easy for children to handle. Larger toys may require different production methods, such as rotational moulding, which can create pieces up to 30 feet long and 5 feet in diameter.
Colour and Aesthetics:
Consider the desired colour scheme and any specific aesthetic requirements. Injection moulding technology allows for optimal colour utilisation by mixing different colours of plastic pellets to achieve the desired shade accurately.
Safety and Environmental Concerns:
With safety being a priority for children's toys, consider any potential hazards and choose materials that are non-toxic and environmentally friendly. Advances in plastics technology have led to the development of safer and more eco-friendly options, such as thermoplastics, which are commonly used in toy manufacturing.
Once the brainstorming and design phase is complete, the next steps can begin, including creating a 3D model, evaluating its producibility, and selecting the appropriate moulding technique for fabrication.
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Injection moulding
To create a hollow plastic toy using injection moulding, several steps must be followed. Firstly, a toy prototype is designed, which can be a wax model or a plastic mould. This prototype is then sent to the production team, where it is fitted into a mould and covered with plaster. When the prototype is removed, it leaves behind a cavity in the mould. This cavity is then filled with molten minerals such as aluminium and magnesium, which cool down and break the plaster around them, creating a production mould.
The next step is to inject molten plastic into the production mould. This can be done using a ram or screw-type plunger, which forces the molten plastic into the mould cavity. The plastic then cools and solidifies, taking on the shape of the mould. This process can be used to create complex shapes and hollow articles, thanks to the development of gas-assisted injection moulding in the 1970s.
However, there are also some drawbacks to consider. Injection moulding has high initial costs due to substantial design and manufacturing expenses, making it more suitable for mass production. There are also environmental concerns associated with the production and disposal of plastics, especially non-biodegradable plastics. Health risks may also arise from certain types of plastics and surface coatings, requiring strict quality control during manufacturing.
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Rotational moulding
The process was first applied to plastics in the 1950s, with one of its first applications being the manufacture of doll heads. Today, it is commonly used to produce a wide range of plastic products, including toys such as playground equipment, ride-on toys, figurines, and doll parts. Rotational moulding is particularly well-suited for creating sweeping curves and smooth, safe, seamless, rounded designs with no sharp edges or corners.
Polyethylene is the most widely used plastic in rotational moulding due to its ease of moulding and excellent chemical and impact resistance. Other plastics used include polypropylene, which is heat and chemical-resistant, and PVC plastisols, which are used to create soft plastic toys.
One of the main advantages of rotational moulding is its ability to produce large, hollow parts with ease, making it ideal for manufacturing toys. It is also a cost-effective process, as rotational moulds are relatively cheap, and excess material can often be reused. However, it is a slow process compared to other techniques, with only one or two cycles typically completed per hour.
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Blow moulding
The blow moulding process consists of three major stages: melting or plasticizing the resin, forming a parison or preform, and inflating the parison or preform in a blowing mould to produce an end product. In the first and second stages, plastic pellets are melted and mixed under heat and pressure to form a tube called a parison or preform. The parison is a tube-like piece of plastic with a hole at one end through which compressed air can enter. The parison is then captured by closing it into a cooled metal mould.
In the third stage, air is blown into the parison, inflating it into the shape of the mould. The air pressure inflates the plastic, which conforms to the mould. Once the plastic has cooled and hardened, the mould is opened and the part is ejected. Water channels within the mould assist with cooling. Finally, excess plastic is trimmed, and the plastic part is tested for quality before being shipped.
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Finishing touches
The final steps in creating a hollow plastic toy depend on the type of toy and the manufacturing process used. For example, a doll made using a rotational moulding process will have its head decorated with aerography to create facial expressions, blushing, and the addition of eyes and hair.
If your plastic toy is made up of multiple parts, you will need to assemble the pieces. This may involve gluing or welding the parts together. You may also need to sand down any rough edges or imperfections before assembly.
Once the toy is assembled, it may need to be painted or decorated. This could involve spray painting, which comes in different techniques like electrostatic, airless, and manual. You could also use a more traditional brush to paint your toy, depending on the level of detail required.
If your toy is made from a material like ABS or PVC, you may wish to add a coating to protect the toy and enhance its appearance. This could be a clear coat or a coloured finish.
Finally, you may wish to add any additional features, such as movable parts, sound effects, or electronic components. These will require additional assembly and testing to ensure they function correctly.
It is important to remember that the finishing touches are crucial to the success of your toy, so take your time and ensure that each step is completed to a high standard.
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Frequently asked questions
The first step in creating a plastic toy is to design a toy model. This can be done by creating a 3D model of the toy using computer software or by creating a wax model.
Injection moulding is the most common method for creating plastic toys. This involves filling hot and mouldable plastic into specific moulds to get a toy part in the desired shape and structure. Toys created through this method tend to be of higher quality, have better colour utilisation, and are more cost-effective.
High-quality plastic toys are usually made of single materials such as ABS, PVC, or thermoplastics, which have good gloss and colour, high hardness and toughness, and excellent stability.
