What are the advantages of injection moulding?
- highly accurate
- very cheap per part
- very fast
- excellent surface texture
- complex shapes
- webs can be added for strength
What are the advantages of compression moulding?
- highly accurate
- very cheap per part
- fast
- excellent surface texture
- complex shapes
- webs can be added for strength
What are the advantages of extrusion?
- fast production
- accurate
- cheap process
- same cross-section throughout
- complex cross-sections are possible
What are the advantages of blow moulding?
- produces hollow parts
- accurate
- cheap
- fast
What are the advantages of rotational moulding?
- produces large hollow parts
- uniform wall thickness makes the product strong
- accurate
What are the advantages of vacuum forming?
- low cost of machinery makes it suitable for small scale production
- accurate and repeatable
- cheap
- fast
- least expensive process
What are the disadvantages of injection moulding?
- high set up costs
- have to hide visible identifying features
- flashing has to be removed
What are the disadvantages of compression moulding?
- high set up costs
- have to hide visible identifying features
- flashing has to be removed
What are the disadvantages of extrusion?
- high set up costs
- extrusions will have to be cut and assembled to make products
What are the disadvantages of blow moulding?
- high set up costs
- only small products can be produced due to the draw on the plastic
- split lines are visible
What are the disadvantages of rotational moulding?
- slow cooling time limits the speed of production
- high set up costs
- split lines are visible
- may require further work to make holes etc
What are the disadvantages of vacuum forming?
- draw on the plastic makes it weaker at the corners
What are the identifying features of injection moulding?
- injection marks
- ejector pin marks
- split lines
- high-quality surface finish
- flash
What are the identifying features of compression moulding?
- ejector pin marks
- split lines
- high-quality surface finish
- flash
What are the identifying features of extrusion?
- long parts with the same cross-section throughout
- lines/scratches along lenght
- shrinkage marks
- good surface finish
What are the identifying features of blow moulding?
- small hollow parts
- plastic will be thinner at corners
- split lines
What are the identifying features of rotational moulding?
- large hollow objects
- uniform wall thickness
- split lines
- thicker at corners
What are the identifying features of rotational moulding?
- thin sheet plastic
- rounded corners
- thinning corners
- visible texture from moulds
-
Plastics11
-
impact of design0
-
assembly5
-
wood processes6
-
Metals10
-
Plastic processes18
-
Metal processes18
-
Standard Components4
-
Design factors0
-
Woods11
-
composite materials7
-
design team24
-
modelling16
-
planned obsolescence4
-
product life cycle11
-
production and planning systems10
-
design briefs and specifications12
-
research and evaluation techniques21
-
push and pull4
