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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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