Ethan Clarke
Shrinky Dinks, also known as Shrink Art or Shrinkles, are sheets of polystyrene plastic that can be cut and decorated to create charms, pins, and other crafts. When heated, the plastic shrinks and becomes thicker and more rigid, retaining the coloured design. The base material consists of thin, flexible polystyrene plastic (#6) sheets, which can be coloured with various materials such as felt-tip pens, acrylic paint, or coloured pencils before heating. While Shrinky Dinks are primarily marketed as a children's toy and art activity, they have also gained popularity among adult crafters and artists and even scientists for their unique properties and applications in nanotechnology.
| Characteristics | Values |
|---|---|
| Type of plastic | Polystyrene |
| Plastic recycling code | #6 |
| Plastic source | Take-out sushi containers, rotisserie chicken lids, plastic clamshells, sandwich lids |
| Plastic state | Floppy |
| Plastic shape | Sheets |
| Plastic properties | Shape-shifting, shrinking |
| Plastic uses | Ornaments, zipper pulls, jewellery, key chains, pet identification tags, greeting cards |
| Plastic uses in nanotechnology | Printing nano-scale patterns, solar cells, high-density displays, chemical sensors |
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What You'll Learn
Recycled plastic #6
Shrinky Dinks are sheets of polystyrene plastic that shrink and thicken when heated, which can be purchased or crafted from recycled plastic. Only one kind of plastic can be used as a Shrinky Dink stand-in: plastic stamped with a #6 recycling code. Plastic #6 is a lightweight polystyrene material that is often used for Styrofoam takeout containers and is generally not recyclable. This is because it easily finds its way into the environment, where it can leach toxic chemicals. Styrene, a component of polystyrene, is suspected to be a cancer-causing neurotoxin for humans.
When crafting Shrinky Dinks, it is important to gather plastics labelled #1 or #6, cut them into the desired shapes, and decorate them with Sharpies. The oven should be preheated to 350 degrees, and the plastic will curl up tight before gradually uncurling and shrinking. It is worth noting that some plastics may shrink unevenly, resulting in a lumpy texture.
While it is possible to use recycled plastic for Shrinky Dinks, it is challenging to find #1 and #6 plastics in flat trays that are suitable for this craft. Take-out sushi trays and containers are commonly mentioned as good sources of plastic #6.
Overall, using recycled plastic for Shrinky Dinks can be a fun and creative way to upcycle waste materials, but it is important to be cautious of the potential risks associated with using certain types of plastic, such as plastic #6.
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Real Shrinky Dink material
The plastic that is used in Shrinky Dinks is called polystyrene. Polystyrene is used in cafeterias as the clear lids that protect sandwiches and other foods. Recycled plastic No. 6 is also polystyrene, and it can be found in the recycling bin in the form of takeout sushi containers and plastic clamshells.
The polymer chains within the polystyrene are bunched up and randomly clumped together. However, when heated, rolled, and cooled, they straighten out and get into a more orderly configuration. When the polystyrene is heated again, the polymers want to bounce back to their more disorderly arrangement. This is what makes the plastic "shrink."
The magic of Shrinky Dinks is a marketing ploy. The plastic film relies on the shape-shifting properties of polystyrene. Without these properties, the plastic would burn, melt, or create a cloud of toxic gases.
The process of making Shrinky Dinks involves colouring a sheet of floppy plastic to create a design and then putting it in a warm oven. The plastic film bends, warps, curls, and then slowly flattens into its original shape. The artwork shrinks by approximately two-thirds and becomes nine times thicker. The result is a more rigid and durable trinket suitable for projects like Christmas tree ornaments, zipper pulls, jewellery, key chains, and pet identification tags.
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Frosted Shrinky Dink plastic
Shrinky Dinks are a brand of printable plastic craft toys that have become synonymous with shrink plastic. Shrinky Dinks are now shrink plastic, in the same way that any vacuum cleaner is called a hoover. The brand was popular in the 1980s, when children would colour in line art drawings, pre-printed on special thin plastic sheets. When heated, the sheets would shrink down to become thicker and more rigid.
Shrinky Dinks are made from polystyrene. By nature, the polymer chains within the polystyrene are bunched up and randomly clumped together, but the heating, rolling and cooling process forces them to straighten out and get into a more orderly configuration. All the polymers want to do is bounce back into their more disorderly arrangement and they are able to do this when the polystyrene is heated again.
Shrink plastic comes in various styles, including clear and frosted. Frosted Shrinky Dink plastic is not printable, but it is great for drawing and then cutting out. Frosted sheets have a textured surface that you can add colour to. The colour intensifies as the plastic shrinks, so it is important to keep that in mind and apply colour lightly. Frosted sheets can be cut just like printable plastic, and you can even use a Cricut pen to draw lines on top that you can then colour in.
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Clear plastic
Shrinky Dinks are sheets of plastic that are coloured, cut, and baked in an oven to create trinkets, charms, and ornaments. The plastic used in Shrinky Dinks is called polystyrene, which is the same type of plastic used for clear lids that protect sandwiches and other foods in cafeterias. This plastic is stamped with a #6 recycling code and can be found in recycling bins as take-out sushi containers, rotisserie chicken lids, and plastic clamshells.
When creating Shrinky Dinks, it is important to note that only one kind of plastic can be used, which is the #6 plastic. Other kinds of plastic will not work as well and may even be dangerous. The #6 plastic can be cut into desired shapes and decorated with Sharpies or permanent markers. It is then baked in the oven at 325-350 degrees Fahrenheit, depending on the source. As the plastic heats up, the polymer chains within the polystyrene straighten out and get into a more orderly configuration, causing the plastic to shrink by about two-thirds and become nine times thicker.
Using recycled #6 plastic to make Shrinky Dinks is a fun and creative way to upcycle plastic that would otherwise be thrown away. However, it is important to note that the results may vary, and the recycled plastic may not shrink or flatten as well as commercial Shrinky Dink plastic. Commercial Shrinky Dink plastic is available for purchase at craft stores and online, and it provides more reliable and consistent results.
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#1 plastics
Shrinky Dinks, the popular children's toy and crafting material, are made from #1 plastics, also known as PET or PETE (polyethylene terephthalate). This type of plastic is commonly used in food packaging, particularly for beverages, and is identified by the small triangle with a "1" inside that you'll find on the bottom of plastic containers.
When heated, #1 plastics undergo a fascinating transformation. They shrink in size and become significantly thicker, often up to three times their original thickness. This process, combined with their increased rigidity, makes them highly durable and ideal for creating long-lasting crafts. The shrinking process is also what gives Shrinky Dinks their distinctive name.
Another advantage of #1 plastics is their ease of decoration. They can be colored with permanent markers, paint, or even crayons, providing a versatile surface for creative expression. Additionally, this type of plastic is known for its ability to hold ink, making it perfect for stamping or printing detailed designs. Once heated, the ink becomes permanently bonded to the plastic, ensuring that the final product is smudge-proof and long-lasting.
It's important to note that while #1 plastics are widely recycled, the process of decorating and heating Shrinky Dinks may affect their recyclability. It's always a good idea to check with your local recycling guidelines to ensure that your creations can be properly disposed of or recycled when necessary.
In summary, the unique properties of #1 plastics, including their flexibility, durability, and transformability, make them the perfect choice for creating Shrinky Dinks. Their ability to be decorated and customized adds to their appeal, providing endless creative possibilities for crafters of all ages.
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Frequently asked questions
Shrinky Dinks are made of polystyrene, a plastic with shape-shifting properties.
Plastic stamped with a #6 recycle code can be used as a Shrinky Dink substitute. This plastic is commonly used for takeout containers and baked goods.
The polymer chains within the polystyrene are initially clumped together randomly. When heated, these chains straighten out and become more orderly. When heated again, the polymers want to return to their original disorderly arrangement, resulting in the shrinking of the plastic.
