Vent Sizes

[Suhas]

When choosing vent sizes for your molds, what is the best resource? Do you rely on on the data sheets or do you go by experience?

[ProcessEval]

Data Sheet from the manufacturer and some handbooks.

[Danny R]

data sheets and handbooks are a great start as rule of thumb, but this is when expertise becomes really important.

[TCurnutt]

The manufacturer's recommendation is a good place to start, but it is only arelative number. This number will give you a feel for how this material reactsin comparison to others. To find the right number you need to take a morescientific approach which considers part geometry and location of gate.

[NATHAN]

Theory never fails...Thousands of Engineer conducted the study on the vent depth recommendation before release into the market.

Then why it fails???? Example PC/ABS C6600 the vent depth recommended was 0.036 ~ 0.075mm.
If the Mold plate and inserts was perfectly matched then the vent depth specified by the manufacturers could be worked
Otherwise the flashing extends......
It depends on Mold maker [ since the parting was already opened by 0.05mm then surely the flash exists on the vent area]
Better One of the point on the product need to be tried as per specification and see how, the point should be END-FILL
There is a chance to control and also no additional pressure further to push the melt.....