Mould Venting

Mould Venting
At the start of the injection cycle, the mould cavity have an air which must be vented as
it is displaced by the incoming melt. Inadequate venting can result in considerable
compression and heating of the trapped air, resulting in slow filling, poor welds and
possible burning of the resin.
Vents are located at the end of flow paths, most often in the parting line but also around
ejector pins.
Vents must be large enough to allow free passage of air, but prevent the passage of melt