2a+Natasha

=Food Packaging =

Requires:

 * 1) Physical protection - shock, vibration, compression, temperature, etc.
 * 2) Barrier protection - oxygen, water vapour, dust, etc.
 * 3) Durable - doesn’t break easily.



//Advantages//

 * can be combined with small amounts of other metals to form alloys
 * can vary in strength
 * excellent barrier (keeps out air, light and microorganisms)
 * light weight
 * corrosion resistant
 * recyclable
 * foil can be sandwiched betweenplastic layers (improve durability)[[image:495017_0a49f76c072bab398deae4d8505dd4e1.jpg width="200" height="251" align="right"]]

//Disadvantages//

 * can’t see contents
 * acidic foods can end up tasting of aluminium
 * foil can have holes poked in it easily
 * non-microwavable
 * cans can be difficult to open without a can opener
 * expensive

Used in:
-aluminium cans -aluminium foil -juice boxes



**Steel:**
Type of metal

//Advantages//

 * durable
 * insulated

//Disadvantages//

 * corrosion
 * can’t see contents
 * non-microwavable
 * expensive

Used in:
-steel water bottles -containers

media type="youtube" key="YUdGecoDv0Q?version=3" height="251" width="448" align="right"

**Polyethylene terephthalate (PET):**
Type of plastic

//Advantages//
= =
 * strong gas and moisture barrier
 * doesn’t shatter
 * light weight
 * recyclable
 * microwave proof

//Disadvantages//
= =
 * bottles shrink when exposed to high temperatures when empty.
 * taste problems (bottles)media type="youtube" key="25SlX-51c50?version=3" height="251" width="448" align="right"
 * chemicals have been known to leach into the contents when left for a prolonged period of time

Used in:
-Plastic bottles -Plastic containers

//Advantages//

 * ====inert====
 * can’t see contents
 * no odour
 * reusable
 * microwave proof

//Disadvantages//
 * shatters
 * expensive
 * defects can occur in production
 * weaknesses can occur in production

Used in: -Glass containers -Glass bottles

Useful links for more elaborative information on:
[] []
 * Food packaging: **

[] [] [] [|http://books.google.com.au/books?id=xZ_SGH3B1gwC&pg=PA351&lpg=PA351&dq=aluminum+food+packaging+disadvantages&source=bl&ots=ViNGr9N4EC&sig=deK5Wh3iHKHZES5laTdbUv7GItQ&hl=en&sa=X&ei=9hkqT5utBuyciAeOtrS8Dg&ved=0CGsQ6AEwCDgK#v=onepage&q=aluminum%20food%20packaging%20disadvantages&f=false]
 * Metal: **

**Plastics:** [] []

[]
 * Glass: **