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    imen, the fourth design concept had been applied. Various
    design considerations had been applied in the design.
    Firstly, the mould was designed based on the platen dimen-
    sion of the plastic injection machine used (BOY 22D). There
    is a limitation of the machine, which is the maximum area of
    machine platen is given by the distance between two tie bars.
    The  distance  between  tie  bars  of  the  machine  is  254 mm.
    Therefore,  the  maximum  width  of  the  mould  plate  should
    not exceed this distance. Furthermore, 4 mm space had been
    reserved between the two tie bars and the mould for mould
    setting-up and handling purposes. This gives the final max-
    imum width of the mould as 250 mm. The standard mould
    base with 250 mm × 250 mm is employed. The mould base is
    fitted to the machine using Matex clamp at the upper right and
    lower left corner of the mould base or mould platen. Dimen-
    sions of other related mould plates are shown in Table 1.
    The  mould  had  been  designed  with  clamping  pressure
    having clamping force higher than the internal cavity force
    (reaction force) to avoid flashing from happening.
    Based on the dimensions provided by standard mould set,
    the width and the height of the core plate are 200 and 250 mm,
    respectively. These dimensions enabled design of two cavities
    on  core  plate  to  be  placed  horizontally  as  there  is  enough
    space while the cavity plate is left empty and it is only fixed
    with sprue bushing for the purpose of feeding molten plastics.
    Therefore, it is only one standard parting line was designed at
    Table 1
    Mould plates dimensions.
    Components                                          Size   (mm) − width ×
    height × thickness
    Top clamping plate                                   250 × 250 × 25
    Cavity plate                                           200 × 250 × 40
    Core plate                                            200 × 250 × 40
    Side plate/support plate                              37 × 250 × 70
    Ejector-retainer plate                                 120 × 250 × 15
    Ejector plate                                          120 × 250 × 20
    Bottom clamping plate                               250 × 250 × 25
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