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heater for press8/5
I have been thinking about using heaters below my flat vacuum press to raise the temp to cure the glue more quickly when using urea formaldehyde glue. Any thoughts on types of heaters. I am not trying to heat up the platen like a hot press...just raise it to cure more quickly. My membrane is polyurethane and don't know how much heat it takes. I have tried the electric blanket, but thought heating from below as well would be a better solution. What methods have you all tried?
Electric blanket on top is what we do when needed. We also add a few packing quilts on top of that to hold the heat in. Not what the blanket maker would recommend, you understand.
We don't leave it like this overnight - only while the shop is occupied. Electric blankets can start fires if overheated.
I too use heating blankets in the winter to improve cure times. I lay the blankets down on the press bed for a half hour or so before pressing to warm the surface of the press. I will put the top sheet on top of the blankets if I am using one.
Urea formaldehyde glue just has the most rigid glue line that I have found. Anytime I use it I get good results. The only downside for me is the cure time. I am trying to speed it up without going to the expense of a hot press.
I have had this discussion over the years with other cabinetmakers about glue line rigidity. I am no expert but my experience has been that there is no difference in the quality of veneer joint between a high quality PVA and UF. I choose to use type 2 water resistant glue because I found it not susceptible to bubbles lifting immediately after pressing and I also lift my veneer tape by moistening with water.