Streaks in a Clarified PP part running with hot tip

Anyone know of a plating that we could put onto the endcap to prevent this buildup from happening?

Thanks for all of the input. The streaks are coming directly from our use of purge compound. We pulled the endcap off and the purge material was stuck to the inside and bleeding off every shot. This was also true of the hot tip. We are looking at alternate methods of purging the press to try and clean it without having to pull the screw every time.

I would look at streaks and see if they are tiny bubbles as sometimes the clarifier can degrade and since you have 3 weld lines,that is where they would go.
Also as stated above look at heats.

Look at non clarified product, is it colored? if so when in natural can you pick out the weld lines? If so than the pressure drop from the drop insert and opening in mold is not much and we are not mixing in this area. Husky has finned inserts to help with this.

TA-
Steven

i would lower my tip temp & reduce injection speed

Have you tried "Purging the plate" as we used to say?

You pull back the cavity plate ( I hope it is built so this can be done. Now make a cardboard template to go over the tips and protect the wiring channels. Purge well, use DynaPurge P to speed up things, followed by the clarified.

Worse case scenario is you have to clean the tips physically.

Have you considered keeping tips only for the clarified? First you have to determine if the whole drop or manifold system is the culprit.

I assume the machine purge is crystal clear?

The clarified will show any contamination, including cloudy.

How many cavities? had this problem with closure molds. We had 32 and 64 cavities to deal with.

Is this a HUSKY system? Have you tried VESPELS on the tips.

Keep Molding

brent

www.matrixtooling.com

I had a similar problem and was able to eliminate it by reducing suck back. You might find necessary to reduce hot tip temperature if melt drools when mold is open between cycles.