Custom Baits - Forum

Soft Plastic Bait Making => Soft Plastic and Plastic Baits - How To??? => Topic started by: creature_fishing on 07/19/15 20:04 UTC

Title: Air bubbles
Post by: creature_fishing on 07/19/15 20:04 UTC

Hi guys, pretty new to injecting. I recently got the ES beaver mold and I was very happy with the results I was getting. But recently all of my baits are coming out with air bubbles on the surface. There didn't appear to be any bubbles in the heated plastic in the pyrex and I haven't started doing anything different. Any ideas?

Title: Re: Air bubbles
Post by: wishn4fishn on 07/19/15 20:43 UTC

I have to shoot slow to keep from getting the dimples on each rib of the body if that's what you're  talking about.

Title: Re: Air bubbles
Post by: BareKnuckleJigs on 07/19/15 21:05 UTC

Put the tip of the injector in the gate/sprue/injection port, raise the vent-side of the mold (leave the sprue/runner-corner of the mold on the table)...this makes the vents the highest part of the mold...inject S-L-O-W.  Let the plastic "flood" the interior of the mold, like a boat taking-on water.  This helps prevent trapping air in the details of the cavity.

Title: Re: Air bubbles
Post by: WALLEYE WACKER on 07/19/15 22:51 UTC

Check and see if there is a small amount of plastic in the positioning  pin that is what I found in a mold I was having trouble with.

Title: Re: Air bubbles
Post by: Arkansasbowhunter on 07/20/15 07:41 UTC

What is the position pin?

Title: Re: Air bubbles
Post by: ctom on 07/20/15 07:54 UTC

Positioning pin, alignment pin....they are the small rounded metal nubs that stick up out of one side of your molds with a corresponding hole on the other. Molds with hinges mostly use one pin while hingeless molds will employ two. They make certain things are straight when the molds are clamped for injecting.

Title: Re: Air bubbles
Post by: Arkansasbowhunter on 07/20/15 10:23 UTC

Gotcha.   Thanks

Title: Re: Air bubbles
Post by: ctom on 07/20/15 10:31 UTC

Creature.....I'll take a sec here to welcome you aboard the Do It see saw of plastic bait injection. Super fun and rewarding hobby!

You'll likely encounter two kinds of bubbles with this type of injection. One is as you describe and is an issue surrounding the injection itself. The other we call micro bubbles and they are a plastic issue that comes and goes with humidity and a few little things that come with the humidity. Both are relatively easy fixes and can be dealt with just as easily. Your surface bubbles and small dents in the surface of baits usually are adequately addressed as the guys have suggested here.

Once again, welcome to the DoIt forums!