The parameters necessary for the design of exhaust channels:
+ Depth of runner: d
+ width of runner: W
+ length runner: l
+ depth of drains D = 20d
+ required number of exhaust grooves
- Do products made of polypropylene so ≤ d ≤ 0.0012 0.0005 choose
d = 0.001 (inch)
So D = 20d = 0:02 (inch)
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