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

    Alumec 89

    80%

    Corrosion resistance

    10%

    Wear resistance

    50%

    Polishability

    80%

    Toughness

    Uddeholm Coolmould

    100%

    Corrosion resistance

    40%

    Wear resistance

    50%

    Polishability

    40%

    Toughness

    Uddeholm Corrax

    95%

    Corrosion resistance

    50%

    Wear resistance

    70%

    Polishability

    70%

    Toughness

    Uddeholm Impax Supreme

    20%

    Corrosion resistance

    30%

    Wear resistance

    60%

    Polishability

    90%

    Toughness

    Uddeholm Mirrax 40

    70%

    Corrosion resistance

    40%

    Wear resistance

    80%

    Polishability

    60%

    Toughness

    Uddeholm Mirrax ESR

    90%

    Corrosion resistance

    70%

    Wear resistance

    90%

    Polishability

    60%

    Toughness

    Uddeholm Nimax

    20%

    Corrosion resistance

    40%

    Wear resistance

    70%

    Polishability

    100%

    Toughness

    Uddeholm Nimax ESR

    20%

    Corrosion resistance

    40%

    Wear resistance

    90%

    Polishability

    100%

    Toughness

    Uddeholm Ramax HH

    60%

    Corrosion resistance

    40%

    Wear resistance

    40%

    Polishability

    30%

    Toughness

    Uddeholm Stavax ESR

    80%

    Corrosion resistance

    70%

    Wear resistance

    90%

    Polishability

    50%

    Toughness

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