Plastic Processes Flashcards
State the identifying features of injection moulding.
- intricate finish
- high quality finish
- webs,ribs and bosses
- in mould markings
- ejector pin marks
- flash
- draft angle
State 4 plastics that are commonly used for injection moulding.
- ABS
- polystyrene(PS)
- polypropylene(PP)
- acrylic(PMMA)
State two advantages of injection moulding.
- economy of scale, the more you make the less cost per unit, suitable for mass manufacture
- very efficient, very quick compared to other plastic process
What is vacuum forming most commonly used for?
- used for packaging
* bath and shower trays
State identifying features of vacuum forming.
- thin plastic packaging
- thin plastic trays than can be stacked
- finger recesses
State the materials most commonly used for vacuum forming
- polystyrene(PS)
- polypropylene(PP)
- acrylic(PMMA)
- PVC
What is injection moulding most commonly used for?
- housing for products, mostly power tools
* electrical switches and sockets
State two advantages of vacuum forming.
- design flexibility
* cost effective
What are the most common uses of rotational moulding?
- tanks for storing water or chemicals
* toys and playground equipment
State the identifying features of rotational moulding.
- large hollow products
* mould split lines
State the advantages of rotational moulding.
- can be used in mass manufacture
- there is no scraps or waste as material is recycled
- can produce completley hollow products
State the plastics commonly used for rotational moulding.
- polypropylene(PP)
* polythylene(PE)
State the two types of blow moulding.
- extrusion
* injected
What is the difference between injected blow moulding and extrusion blow moulding?
•injected blow moulding is when he plastic is injection moulded then blow moulded and extrusion blow moulding is when the plastic is blow moulded into the mould.
What is blow moulding commonly used for?
•bottles, tubes and tubs
