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Design > Blow Moulding & Extrusion > Flashcards

Blow Moulding & Extrusion Flashcards

1
Q

What happens to thermoplastics when they are heated?

-Lucas M

A

Thermoplastics always soften with heat.

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2
Q

Acrylic, Polythene, Polypropylene are which type of polymer?

-Lucas M

A

Thermoplastic.

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3
Q

When forming plastic, which method is most similar to toothpaste coming out a tube?
-Lucas M

A

Extrusion.

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4
Q

When forming plastic which method blows air into a softened polymer cavity causing it to expand?
-Lucas M

A

Blow moulding.

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5
Q

During which plastics forming process would you place a mould onto a platen?
-Lucas M

A

The first stage of vacuum forming.

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6
Q

Why do you want lots of holes in your mould when vacuum forming?
-Oscar Lawson

A

To ensure the polymer is sucked fully onto the mould leaving no gaps.

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7
Q

How much tapering is needed for a good draft angle on your mould when vacuum forming?
-Oscar Lawson

A

At least 5 degrees.

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8
Q

Why do we use the plastic material code system?

-Oscar Lawson

A

So we can easily recycle plastics and they can be identified and distinguished at a glance.

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9
Q

Why would you choose injection blow moulding over extrusion blow moulding?
-Oscar Lawson

A

For a higher degree of accuracy, specifically around the neck and screw thread of the bottle.

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10
Q

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

A

Extrusion blow moulding.

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11
Q

Forcing softened plastic though a die is called..

-Yan K

A

Extrusion moulding.

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12
Q

What geometry most shows that a plastic product has been extruded?
-Yan K

A

A continuous length of a specific cross section.

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13
Q

Which process would be used to mould plastic electrical cables, Trunking, or Pipes?
-Yan K

A

Extrusion moulding.

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14
Q

A vacuum forming mould has a draft angle so that…

-Yan K

A

It can be easily removed after moulding.

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15
Q

How many different moulds are then when injection blow moulding plastics?
-Ed H

A

2

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16
Q

What are the two main types of blow moulding?

-Ed H

A

Extrusion blow moulding and injection blow moulding.

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17
Q

A bath made from plastic would most likely have been made using which method?
-Ed H

A

Vacuum forming.

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18
Q

What are the forces of attraction that hold thermoplastic chains together?
- Ssnehnil G

A

Van der waals forces.

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19
Q

Which plastics moulding process is most likely to be used to form a slide?
- Ssnehnil G

A

Vacuum Forming.

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20
Q

Which process is used to form plastic trunking to contain cables?

  • Ssnehnil G
A

Extrusion.

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21
Q

Which process is used to form a plastic Coke Cola bottle?

- Ssnehnil G

A

Injection blow moulding

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22
Q

Where are plastic granules placed in an Extrusion Machine?

-Caspar Tyser

A

In the Hopper.

23
Q

What is a main characteristic of an Extrusion Blow Moulding?

-Caspar Tyser

A

A visible line on the bottom or around the container.

24
Q

What type of manufacturing process is Vacuum Forming?

-Caspar Tyser

A

A deforming process.

25
Q

What type of plastic is used most when forming plastics?

-Caspar Tyser

A

thermoplastics, apart from in compression moulding.

26
Q

Is Polythene commonly used in vacuum forming?

-Oscar Mabon

A

Yes

27
Q

Is Nylon commonly used in vacuum forming?

-Oscar Mabon

A

No

28
Q

Is PVC commonly used in vacuum forming?

-Oscar Mabon

A

Yes

29
Q

Is Acrylic commonly used in vacuum forming?

-Oscar Mabon

A

Yes, but it is brittle!

30
Q

Is PET commonly used in vacuum forming?

-Oscar Mabon

A

No

31
Q

Is PTE in the plastics code system

-Alfie Turner

A

no

32
Q

is PS in the plastics code system

-Alfie Turner

A

yes, polystyrene PS is number 6

33
Q

What does V stand for in the plastic PVC?

-Krystian shanahan

A

Vinyl

34
Q

HIPS (High Impact Polystyrene) is most frequently used in which process?
-oli shaw

A

Vacuume forming.

35
Q

in vacuum forming, a Thermoplastic sheet is heated until …

-oli shaw

A

soft

36
Q

What is PETE

-oli shaw

A

Polyethylene Terephthalate - code number 1

37
Q

Which method would be used to make plastic pipes

-oli shaw

A

extrusion

38
Q

How does plastic extrusion help protect electrical cables?

-Torsai K

A

Extrusion is used to provide the plastic cover on electrical cables.

39
Q

If a plastic bottle has a screw thread which is visible from the inside and the outside, which form of blow moulding was most likely used to manufacture it?
-OTC

A

Extrusion blow moulding.

40
Q

Which plastic is coded as number 1

-OTC

A

PET/PETE - Polyethylene terethalates.

41
Q

Which plastic is coded as number 2

-OTC

A

HDPE - high density polyethylenes.

42
Q

Which plastic is coded as number 3

-OTC

A

PVC - poly vinyl chlorides.

43
Q

Which plastic is coded as number 4

-OTC

A

LDPE - low density polyethylenes.

44
Q

Which plastic is coded as number 5

-OTC

A

PP - polypropylenes.

45
Q

Which plastic is coded as number 6

-OTC

A

PS - polystyrenes.

46
Q

Which plastics are coded as number 7

-OTC

A

Other plastics which do not fall into other categories.

47
Q

Which coded number is assigned to the plastic PET/PETE - Polyethylene terethalates.
-OTC

A

1

48
Q

Which coded number is assigned to the plastic HDPE - high density polyethylenes.
-OTC

A

2

49
Q

Which coded number is assigned to the plastic PVC - poly vinyl chlorides.
-OTC

A

3

50
Q

Which coded number is assigned to the plastic LDPE - low density polyethylenes.
-OTC

A

4

51
Q

Which coded number is assigned to the plastic PP - polypropylenes.
-OTC

A

5

52
Q

Which coded number is assigned to the plastic PS - polystyrenes.
-OTC

A

6

53
Q

Which coded number is assigned to the other plastics which do not fall into other categories.
-OTC

A

7

Design (31 decks)

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