Compression/Transfer moulding

    Compression moulding

    Compression moulding is a technique mainly for thermoset moulding and is often used for moulding of glass fibre reinforced plastic. In the process the moulding compound is placed in the open mould cavity, the mould is closed and heat and pressure are applied until the material is cured. High hardness steel is normally used. For big moulds it is common to use prehardened material with high hardness inserts, in places where higher wear resistance is needed.

    Mould material properties
    Important properties are:
    • Wear resistance
    • Strength and hardness

    Transfer moulding

    Transfer moulding is a method of moulding thermosetting materials and is very common in production of electronic devices such as: integrated circuits, capacitors and diodes. In the process the plastic is softened by heat and pressure in a transfer chamber, then forced by high pressure through sprues, runners and gates into a closed mould for final curing. An important advantage with this method is the close dimensional tolerances possible to achieve.

    Mould material properties
    The resin, especially epoxy, tends to attack the mould and the part may stick in the mould during ejection. Often some type of surface treatment is needed. In order to avoid indentations the compressive strength should be high. Bigger inclusions in the mould material must be avoided, as it may give an imperfect surface. Because of the very strict tolerances of the part the mould inserts must have a very good dimensional stability during production. The different components of an IC mould each have individual demands on the tool material. Each component requires steel with a suitable properties profile. The following properties are important:
    • Wear resistance
    • Compressive strength
    • Corrosion resistance
    • Cleanliness
    • Dimensional stability during use

    Uddeholm Elmax SuperClean

    60%

    Corrosion resistance

    90%

    Wear resistance

    80%

    Polishability

    40%

    Toughness

    Uddeholm Mirrax ESR

    90%

    Corrosion resistance

    70%

    Wear resistance

    90%

    Polishability

    60%

    Toughness

    Uddeholm Orvar Supreme

    30%

    Corrosion resistance

    80%

    Wear resistance

    30%

    Polishability

    60%

    Toughness

    Uddeholm Stavax ESR

    80%

    Corrosion resistance

    70%

    Wear resistance

    90%

    Polishability

    50%

    Toughness

    Uddeholm Tyrax ESR

    80%

    Corrosion resistance

    80%

    Wear resistance

    95%

    Polishability

    60%

    Toughness

    Uddeholm Unimax for Plastic Moulding

    30%

    Corrosion resistance

    80%

    Wear resistance

    80%

    Polishability

    60%

    Toughness

    Uddeholm Vanadis 4 Extra SuperClean

    20%

    Corrosion resistance

    80%

    Wear resistance

    80%

    Polishability

    50%

    Toughness

    Uddeholm Vanax SuperClean

    100%

    Corrosion resistance

    75%

    Wear resistance

    80%

    Polishability

    60%

    Toughness

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