Injection molding filters
Can any one here share some info regarding injection molding filters?
Models, effect on the process, pressure / process influence, material shear…..
One type to filters is Gap Filter.
I prefer the PPE edge filter style. Easy to clean, rugged, and easy to order different filter gaps. May, depending on clearance, filter out fillers.
I like the Synventive units. But I have seen them bust the screen when people don't realize they are full and maxing injection pressure out. Price is OK. These can filter out glass and mineral fillers.
Herzog makes probably the best unit. Pricing is on the high side. They can be busted if not cleaned. they have a style that requires a wrench to open the gap, purge out the garbage, then close the gap on the melt filter. They may still make a modle that opens the purge gap when the nozzle is not against the mold. Gap will determine if fillers may be filtered out.
Breaker plates. Hate them, they can bust, and changing is not very fast or easy. They also don't last very long. Glass fibers will pile up behind them, as well as many mineral fillers.
Hope this helps, Rick.
What is the "PPE" edge filter?
From my experience, there is another big advantage for the filters like HERZOGE's kind. They have the ability to filter "long" particles (wood / metal) from the melt, not like the gap filters.
Did you notice any pressure differences between the filters?
Are you familiar with HASCO’s filters?
With the Synventive style, there is an increase in injection pressure, but if you are not running pressure limited-then no issues.
The link to the PPE style is listed below. We used them for alumimum riviets in regrind (how it got there is a long story!).
As far as Hasco goes, I haven't used one of them.
Now we went a step further in my last plant. They used S+S metal separators on the feed throat of each press. These will remove ALL metals, not just the ferrous ones. They are not cheap, but neither is production lost!