|Forum topic by Jack_Isidore||posted 04-27-2012 09:56 PM||971 views||0 times favorited||2 replies|
04-27-2012 09:56 PM
Hi, I’m trying to glue some paperbacked veneer back to back, that is the paper back of one sheet glued to the paper back of another sheet. Reason being I need veneer sheet stock about 40-50 mils, and the only good selection of veneers I have been able to find are either ~20 mil thick, or in some cases 30-35 mil (still not thick enough and my application is thickness critical). See this post for more background info http://lumberjocks.com/topics/37256#reply-426589 – I’ll add the reason for having the (same) wood on the back side of my sheet is because I laser engrave shallow reliefs into them, and I’d rather do this into wood as opposed to a plastic substrate or a paper backing of a second veneer.
So, are there any implications I need to be aware of before I attempt this and buy equipment and supplies? For example, I was going to use a vacuum bag with this glue – http://www.veneersupplies.com/products/Better-Bond-Titan-DX-Premium-Contact-Cement.html – however it specifically says that application needs to be done with a scraper for adequate pressure (not a roller, does not mention one way or the other with vacuum press). If I’m doing several boards approximately 24” x 12” will it be very time consuming or exhausting to manually press them together if a vacuum bag will not work for this type of glue? Should I consider a different type of glue altogether?
Last consideration I can think of is whether to align the grain or go perpendicular. I like the idea of added rigidity from a perpendicular ply, but I also need to consider stability. Since I am not applying the veneer to a relatively rigid substrate like plywood or MDF, I need to achieve maximum stability of the sheet on it’s own. I realize I won’t acheive zero warpage, but I want to minimize it. I also would like to minimize the amount of cross-grain expansion and contraction of the wood due to surrounding environment the part is in. Seems that a perpendicular construction would aid in this.
Any and all input would be much appreciated!