Blow moulding

Blow moulding is a process for shaping thermoplastic into a hollow product. A hot thermoplastic tube is stretched with air pressure and cooled against a mould surface.

Mould material requirements

Blow moulding is a low pressure method where strength and wear demands are very moderate. Some parts of the mould, like shot off areas and/or neck ring, may require higher strength material. PVC is a common material for bottles and may cause corrosion problems. Blow moulding is a very high productivity method why cycle times are of great importance. The most common material to use in blow moulds is aluminium alloys, with inserts of higher hardness materials. Steel is also used and in some cases even in the soft annealed condition.

Mould material properties

Important properties are:

  • Moderate strength demands
  • Corrosion resistance
  • Heat conductivity
Uddeholm Plastic Moulding Applications - Blow Moulding
80%

Corrosion resistance

10%

Wear resistance

50%

Polishability

80%

Toughness

100%

Corrosion resistance

40%

Wear resistance

50%

Polishability

40%

Toughness

95%

Corrosion resistance

50%

Wear resistance

70%

Polishability

70%

Toughness

20%

Corrosion resistance

30%

Wear resistance

60%

Polishability

90%

Toughness

70%

Corrosion resistance

40%

Wear resistance

80%

Polishability

60%

Toughness

90%

Corrosion resistance

70%

Wear resistance

90%

Polishability

60%

Toughness

20%

Corrosion resistance

40%

Wear resistance

70%

Polishability

100%

Toughness

20%

Corrosion resistance

40%

Wear resistance

90%

Polishability

100%

Toughness

60%

Corrosion resistance

40%

Wear resistance

40%

Polishability

30%

Toughness

80%

Corrosion resistance

70%

Wear resistance

90%

Polishability

50%

Toughness

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