CLICK HERE FOR INDEX PAGE

THE OZONE LAYER - CFC GASES AND SYMBOLS

V. Ryan 2007 - 2008

 

The ozone layer is extremely important as it protects the earth and its inhabitants from the dangerous ultraviolet rays of the sun. By the 1990s damage to the atmosphere was discovered by British Scientists in the Antarctic. Gases such as CFC’s had damaged the ozone layer, creating a huge hole through which dangerous ultraviolet light could penetrate. Where the hole in the ozone layer developed, these dangerous rays penetrated and reached the earths surface.

Scientists believe that a increases in skin cancer, plant damage, and reduction of plankton in the oceans may result from the increased UV exposure due to ozone depletion. In 2006 the hole in the ozone layer was the largest ever recorded at 11 million square miles. The image opposite shows the extent of ozone depletion. The blue area shows the hole in the ozone layer and clearly displays the scale of zone depletion.

 
In the 1980s our sample businessman, shown below tried to impress his secretary by using a rather cheap antiperspirant called TIGER. According to the advertising campaign, spraying ‘Tiger’ under sweaty armpits encourages women to show affection towards the user.
The antiperspirant failed to work. However, a side affect of using sprays in the 1980’s is that the CFC gases inside the can, when released, damaged the earths ozone layer.

By 2007 our businessman blamed ozone layer depletion on his hair loss, due to years of unfiltered sun rays directly on his head. No amount of antiperspirant will help him now.

 

By 1989 Governments around the world realised that the damaging CFC gases had to be replaced with environmentally friendly alternatives. (Montreal Protocol on Substances That Deplete the Ozone Layer, 1989)

When you buy a can of antiperspirant or any type of spray, check for the Ozone Friendly symbol. This means that gases inside the container will not damage the atmosphere.

Two other important symbols are normally on pressurised containers. A symbol reminding the purchaser of the dangerous of solvent abuse and a warning that the gases used to pressurise the can could be extremely inflammable.

 
 

 

PDF FILE - CLICK HERE FOR PRINTABLE VERSION OF EXERCISE SEEN BELOW

Design your own ‘No CFC’s’ symbol. Think carefully about the colour scheme. This should reflect the environment (suggestion - green and blue may be a good starting point). You may wish to base it on the existing ‘No CFC’s’ symbol or develop a completely new symbol. Add notes to help explain your designs. An example design is shown below.

 

The symbol opposite emphasises the damage caused by CFC gases to the ozone layer. The yellow represents the suns rays. A large amount of the earth is coloured red, this shows the scale of the damage.

What do you think of this symbol?

 
Sketch two rough designs in the boxes below.  
 

Select your best design and draw it accurately in the space below. Use colour and shade to enhance the final presentation. Add notes to help explain your design.

 
 
 
 
 
   
Draw your best design again, this time using a CAD package such as Corel Draw or Flash.
   
What does CAD mean?
 
   
In your opinion are there any advantages to using CAD - list them below?
 
 
 
   
What are the advantages of sketching by hand?
 
 
 
   
Which of the two methods of designing, CAD or sketching by hand do you prefer?
 
 
 
   
The special CAM machine seen below is to be used to different coloured cut sticky back vinyl which will be used to manufacture the new NO CFC’s symbol.
Name a suitable CAM machine that could be used for the manufacture of the symbol.
 

Name:

Red, Blue, Green and yellow coloured vinyl are to be used to manufacture the symbol. Explain how the machine could be used to carry this manufacturing process.

 
 
 
   

It has been decided that the same design of symbol is to be manufactured using coloured card. List the equipment you would need to manufacture the symbol and sketch a simple drawing of each piece.

 
     
CLICK HERE FOR GRAPHICS INDEX PAGE
     
CLICK HERE FOR TECHNOLOGY AND ENVIRONMENT INDEX PAGE
     
 
Google
 
Web www.technologystudent.com