Darryl Keil
 Posts: 1454
Joined: 2003-05-22
Location: Maine
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Rob,
Well, there is a story behind my explanation that goes like this. Quite a few years ago I was at the very first trade show we ever did with the vacuum press and someone came up to me in our booth, looked at a part that I had sucked down in the bag and said, "how does the glue dry in the bag". Well I had never even thought about that before as the veneer had always stuck for me just fine, so I knew it worked. Being quick on my feet I said, "there's no more air circulation a 1/4" in from the edge on a conventional platen press than there is in a vacuum press" This seemed to satisfy him but I did make a mental note that I wanted to understand the process with PVA glues and give a better answer than that.
After the show I contacted someone I knew who was and expert in the glue field and he explained to me about the bond and cure phase of PVA glues, which of course made perfect sense when I heard it, I had just never thought of it before. It did get me thinking though, which was the beginning of the development of Unibond 800.
I will ad this, which is the first time I've put this out anywhere, we are in the early stages of attempting to develop a new glue that would still be catalytic like Unibond 800 but be as "green" as possible. I make no promises about our success or how long it will take but we are working on it. Stay tuned.
Darryl
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