Monday, October 13, 2008

Shrink Plastic Ideas

I found this wonderful article on shrink plastic. For those of us who love a bargain, check out the idea of reusing deli plastic containers!

~*~ Courtesy of :

For art fun cheap, we like to find, salvage, and experiment with the commercial shrink plastics that you can often get for free. The more you look around, the more you will find examples of heavy shrink plastic that is used commercially and then discarded. Often you can save the plastic, decorate it, and reshrink it.

You can find many products, sometimes for free, that are actually made of or packed in shrinkable plastic. Always check the recycle mark on plastic containers. (Remember the deli container lid that started it all.)

Check the plastic containers in your pantry and at the grocery store, especially picnic supplies. If the number in the center of the mark is a 6 (in the U.S., at least), you should be able to safely shrink it with a heat gun or in an oven.

The mark in the picture below is a 5. That means it is not shrink plastic, so don’t heat it!

Recycle mark on bottom of cup. Oops! This is a 5, so don't shrink it!

How to Shrink Plastic

To safely and evenly shrink plastic, you can use your kitchen oven. Put the pieces on a cookie sheet lined with aluminum foil. The smoother the surface, the more evenly the plastic will shrink; so place the foil shiny side up.

Or you can use the kind of heat gun that rubberstampers and other hobbyists use to activate embossing powder. Those are just the right temperature. You can buy them in hobby stores such as Michael’s and Hobby Lobby, and sometimes other places. The price ranges from about $10 to $20 in the U.S.

Caution: Always be careful. Work in a well-ventilated area. Do not overheat. If you smell anything, if your eyes water, or if you notice anything odd, stop. Never try to shrink any plastic you can’t identify. Even fumes you can’t smell could cause long-term damage. Never heat Styrofoam!

Clear Shrink Plastic

As mentioned earlier, the tops of many deli containers are Type 6 plastic, which you can use as shrink plastic. So are some of the large, clear clamshell containers that deli sandwiches come in.

Most embossed features, like the recycle mark and any borders, will shrink out, so experiment and see what you can do. After all, it’s free.

Some clear drink cups sold in grocery stores are also shrinkable plastic. After a party or picnic, you can wash them and use them for shrink plastic.

However, because of the way they are stretched into cup shape, they will shrink drastically in the vertical direction and only a little horizontally. If you plan ahead, you can use that as a special effect, but don’t plan on using the cups as you would regular, flat shrink plastic.

Stained Glass Colors

Many stores sell Type 6 plastic cups in transparent colors: pink and blue all year ‘round, and red and green around Christmas.

Colored plastic cups made of shrinkable plastic

It is worth figuring out how to deal with the uneven way the cups shrink, because their deep, rich, stained-glass-like colors make wonderful embellishments for paper arts or beads for jewelry-making. They can be used in assemblages or attached to canvas in acrylic paintings.

I recently found a package gorgeous purple shrinkable cups at a dollar store. They also had other colors, such as blue and green. Always check the Recycle mark, however, before shrinking.

Solid Colors

Solid color cups made of Type 6 (shrinkable) plastic are sold in many grocery, drug, and discount stores. I haven’t tried the solids yet, but they are basically painted opaque white shrink plastic, so they should work.

Preparing Cups for Shrinking

Here is how I prepare shrinkable plastic cups for shrinking into a flower shape:

1. Use kitchen shears or other strong scissors to cut the cups vertically from top to bottom.

2. Cut the ends into a rounded shape, cutting off the rolled edge. They should then look like this:

Plastic cups cut from top to bottom, with the cut ends rounded off.

3. Be sure to trim off any splinters, such as the one shown in the picture below.

This splinter, created while cutting the cup before shrinking, should be trimmed off.

While soft and harmless when cut, they can be hard and sharp after shrinking. It is best to get rid of any sharp points before you shrink.

4. For some purposes, such as assemblage, you may want to punch one or more holes in the round center, which was the bottom of the cup, or in one or more of the “petals.” I recommend using a strong, cheap 1/4-inch metal hole punch. It will take some strength.

Note: To sharpen the punch, use it to punch holes in aluminum foil first.

4. Use a heat gum carefully. Do not get it too close to the shrink plastic or any other plastic surface, such as carpet, that can melt. (Ask me how I know this!)

Note: If you have some metal kitchen tongs or insulated tweezers from a tool kit, it’s easier to hold the plastic without burning yourself. Or you can shrink it on a cookie sheet (covered with a sheet of aluminum foil) in the kitchen oven.

Here is a scan of some cups that I shrank hurriedly to illustrate this post. I have had better results in the past.

Three plastic cups, shrunken with a heat gun.

My current scanner has a very shallow depth of field, so only the parts of each cup that actually touched the glass scanner bed are in focus. Still, you can see the effect.

When you shrink cups in the oven, the shapes should shrink very flat. Remember, that you can always reheat and reshape shrink plastic even after it has been shrunk.

5. Some artists use wooden spheres, wooden eggs, and other shapes from hobby stores to shape the heated plastic. You can also use a block of wood to flatten shapes while they are hot.

Note: The purple cup turned out to be Recycle 5, but I tried shrinking it anyway. It did not so much shrink, as shrivel. But I think it is interesting and could be used in a mixed-media painting or an assemblage. I would NOT recommend heating any plastic that is not labled Recycle 6, however, especially in your cooking oven. Who knows what toxic gases I released by shrinking that cup?

Making Shrink-Plastic Leaves

One of the amusing things about shrinking plastic cups is how much they shrink vertically. Instead of cutting petal shapes, you can cut out long slender leaves (like willow leaves), running from top to bottom of the sides of the cup. When you shrink them, they become round, fat leaves, because they shrink only in length.

Have Fun Shrinking Plastic…and Let Us Know What You Discover


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