Blow Moulding & Extrusion Flashcards
What happens to thermoplastics when they are heated?
-Lucas M
Thermoplastics always soften with heat.
Acrylic, Polythene, Polypropylene are which type of polymer?
-Lucas M
Thermoplastic.
When forming plastic, which method is most similar to toothpaste coming out a tube?
-Lucas M
Extrusion.
When forming plastic which method blows air into a softened polymer cavity causing it to expand?
-Lucas M
Blow moulding.
During which plastics forming process would you place a mould onto a platen?
-Lucas M
The first stage of vacuum forming.
Why do you want lots of holes in your mould when vacuum forming?
-Oscar Lawson
To ensure the polymer is sucked fully onto the mould leaving no gaps.
How much tapering is needed for a good draft angle on your mould when vacuum forming?
-Oscar Lawson
At least 5 degrees.
Why do we use the plastic material code system?
-Oscar Lawson
So we can easily recycle plastics and they can be identified and distinguished at a glance.
Why would you choose injection blow moulding over extrusion blow moulding?
-Oscar Lawson
For a higher degree of accuracy, specifically around the neck and screw thread of the bottle.
If a plastic bottle has a visible line on the bottom where the two halves of the mould met, which form of blow moulding was used to make it?
-Oscar Lawson
Extrusion blow moulding.
Forcing softened plastic though a die is called..
-Yan K
Extrusion moulding.
What geometry most shows that a plastic product has been extruded?
-Yan K
A continuous length of a specific cross section.
Which process would be used to mould plastic electrical cables, Trunking, or Pipes?
-Yan K
Extrusion moulding.
A vacuum forming mould has a draft angle so that…
-Yan K
It can be easily removed after moulding.
How many different moulds are then when injection blow moulding plastics?
-Ed H
2
What are the two main types of blow moulding?
-Ed H
Extrusion blow moulding and injection blow moulding.
A bath made from plastic would most likely have been made using which method?
-Ed H
Vacuum forming.
What are the forces of attraction that hold thermoplastic chains together?
- Ssnehnil G
Van der waals forces.
Which plastics moulding process is most likely to be used to form a slide?
- Ssnehnil G
Vacuum Forming.
Which process is used to form plastic trunking to contain cables?
- Ssnehnil G
Extrusion.
Which process is used to form a plastic Coke Cola bottle?
- Ssnehnil G
Injection blow moulding
Where are plastic granules placed in an Extrusion Machine?
-Caspar Tyser
In the Hopper.
What is a main characteristic of an Extrusion Blow Moulding?
-Caspar Tyser
A visible line on the bottom or around the container.
What type of manufacturing process is Vacuum Forming?
-Caspar Tyser
A deforming process.
