Injection moulding.
injection moulding is where a plastic or other material is injected into a system like the one in the picture and then is heat up into a liquid and is then pushed/forced into a mould.

In metalworking and woodworking, a jig is a type of custom-made tool used to control the location and/or motion of another tool. A jig's primary purpose is to provide repeatability,accuracy, and interchangeability in the manufacturing of products.

Notes from last lesson
 plastic is known as polymers are made from crude oil which is non renewable. which is made from monomers joint together to make polymers

there are two type of plastics:
thermoplastics and thermosetting
thermoplastics go soft when heated and thermosetting are heated and moulded once.

plastics:

• Are good electrical and thermal insulators
• Have a good strength to weight ratio
• Generally good resistance to atmostperic and chemical erosion 
• Have a low melting point
• Are light weight
• They are available in wide range of colours and transparency.

Fillers are added to polymer powder to give the material some bulk
Flame retardant is to reduce the risk of catching fire
Anti static reduces the effects of static charges
plasticisers make the plastic less brittle
stabilisers reduce the effects of ultra violet light.

types of plastic:
PMMA: Acrylic.

I should of never purchased
The item i should of never of bought is a HP touch pad. The reason I got a HP touch pad was they were very cheap compared to IPad. Maybe the reason it was so cheap is because it was so terrible. The only good things about the HP Touchpad was that it was touch screen, looked like an IPad, you could go on the internet with it when it decided it wanted to and it had beats by Dr. dre built into it.
Reasons why the Touchpad is so bad is because it had no decent apps on the HP store, when the touchpad ran out of battery it would take a hour to load when you put the charger into it, Also when you are looking through the internet it would freeze for a couple of minutes and the touch pad had a webcam on the top of it but the quality of the camera was low and after a week of using it, it stop working.
I know my touch wasn't the only one that didn't work because my mum bought one too and hers did the same so overall the product is very poor.