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3mm PVC adhesion---trailing edge2/2
Poor adhesion on trailing edge of part, glue is there is it just stuck to panel. Not sure why there is good adhesion at front and not at back. I have checked---premill head, pressure rollers, guillotine (throught it might have been jerking banding), shop is about 62 degrees. I have ran several different types of banding with similar results, it is not just one banding color or type. adhesion is good on 0.5mm banding, but get worst as thickness increases. I've increased, pressure on rollers and increased glue temp, it gets better, but never as good as leading edge.
You may need to check the pressure on your pressure rollers- this is a tip I got from a Rehau engineer. Sometime it ends up squeezing out too much glue and hence the spring back, lack of glue and the bad trailing edge cut.
Another thing is make sure you check with your manufacturer on your glue. We use Jowat and when running 1/2 mil, we use, I think is 286.00. On the 3 mil in big runs we switch to 280.60 (I think).
Just a thought, but.....
Because you have good coverage on the leading edge, it looks like you are running out of glue. Try increasing temp to reduce viscosity, or open up the gate to allow a little more glue through.
No idea really, just a guess, but its something I would check.
glue is there. We ran an 1.5 thick 96" long panel with no banding to check glue line. Looks pretty even tip to tail. The glue is there is just does not stick the banding as well on the trailing edge.
I once had a bander that had a chain that would make the panel move away from the fence as it fed. If your glue pot has more tracking tolerance than your pressure section that could cause the problem. Easily adjusted. BUT,
I have seen this happen with too much pressure on the pressure roller. I adjusted my pressure roller up but it seemed to come up more after I had left it. I was seeing this on long pieces. There was enough pressure to push the panel; out of alignment with the feed chain.