brush hog tail

[Shaunm81]

I have been trying to pour some brush hog worms and having some problems. I keep getting air pockets in the very end tail and trying to figure out what the heck is causing it.  I put both clamps back by the tail even and tightened very tight. I have tried taking off pressure from clamps a tad and still having this problem. I tried pouring the plastic down in the injector and push it to release plastic back in the cup then shooting it straight to the mold to be sure theres no air and im still getting air pockets. I have tried even leveling out the mold  to make sure its all pouring in right. Any idea what the heck is causing this?plastic is heated around 320-350 degrees. Does humidity play anything to do with shooting plastics? I just got the mold today and first time ever using it. Anyway thanks in advance

[DF]

Do you have a photo? Is it a bubble or an incomplete fill?  Here is a video on air in baits  https://www.youtube.com/watch?v=E3-9hKyxLkQ

[ctom]

You could try changing the speed of the injection, slow it down a little. The mold may need to be heated up a bit or perhaps a light coat of worm oil can be applied to the area where the bubbles are found. Take a peek at the mold's venting to be sure that they are all clear....it may be that the vents at that end of the cavity needs to be opened up slightly but only as a last resort.

I'd use minimal clamping pressure at the tail section of the mold and try getting the plastic a bit warmer, maybe up to 360 degrees on an already very warm mold. Try pre-heating the mold with some junk or scrap plastic that's been heated up to about 370 degrees....fill the mold and let it sit with the hotter plastic in it for a couple minutes. Empty and repeat the process four or five times to get that mold real hot.

Incomplete tail parts or air bubbles in the tail parts usually are a result of plastic temperature issues or air not getting out of the mold fast enough. This does not sound like an injector issue to me but don't overlook it as a problem.

[Shaunm81]

Thanks guys. I forgot to mention im using re melts until my new plastic arrives.  I guess I just had to see what a few were going to look like :-) Anyway I will back off on pressure  and  apply a tad bit of worm oil back there..  I will preheat it also and see  if that helps. Anyway thanks for the help and ill check out the video.

[Shaunm81]

Here is a pic its not the best

[Apdriver]

I would start with a little injector maintenance on this one. Make sure air isn't coming in when I draw my plastic. Look at your orings and make sure they are in good shape. If they are with no tears, cuts, flat spots etc. you can remove them and put a couple rounds of Teflon tape under them, in the groove, then reinstall and that will tighten them up. If they are damaged, replace them though.