Not sure about the Jerry blades, but most of that is injection molded plastic.
It's little beads that are tossed into a hoper that feeds into a heat chamber/tank where it melts to a thick goo and then is pressed into the molds through little openings called sprues. Once the molds are filled the plasgtic cools a bit molds opened, pieces falls out. Basically how it works. Probably Jerry Blades are injection molded, I think but not sure.
I never saw any large plain sheets or blocks really for just carving things out of.
You could try US Plastics and see if they have anything.
We all have different limits like space and such. My suggestion, depending on what you can actaully do. Get a large black plastic barrel, cut it larger than you want the blades. Clamp between two pieces of plate steel and bake it. NOT in your house or cook stove though!! If you get it hot enough it should start to melt a little and the clamped plate steel will squeze it flat, should take the barrel curve out and maybe smooth the band type lumps also. You do not want it too hot that it melts to liquid, burns or smokes. Just hot enough to melt it enough that it gets mushey all the way through.
For an oven to do this, anything you can build outside in the yard big enough to hold the clamped plates inside and that will hold the heat well. Stack some concrete blocks a few feet high, toss a piece of metal siding/roofing over it. Should not be too large but large enough. If you want to keep this for ever for other uses too then bury in dirt, up the sides and cover the top, make a mound. You need something you can open and close to for the front to put parts into and take out of it. 2 Small sheets of metal siding screwed together filled with fiberglass insulation should work. For a burner, anything you can control the fire with, burner from old cook oven, grill, water tank, etc.. and use some propane for feul.
I have used things like that. What I do to save feul is heat the oven hot with a wood or charcoal fire first, let that burn down to a small fire/coals to continue heating, place the parts into the oven, then control the burner for the extra heat needed as the fire dies out. I do not use the fire really for the actaul parts, but to get the oven really hot before putting the part in.
If you want to go to all that trouble it may work well, it may not. I have done this for smaller things but not for anything as large as blades. I see know reason for it to not work, though you may have to experiment to get it right.
Leave a vent at the top or back for the exhaust flow like any oven of this type would have. It probably would be better if you used Electric heating elements like from cook stove burners or ovens. Remember, plastics can burn in flames and very hot. Don't breath any fumes, they are hazardous. Keep the melting platsics ventilated, watch it some how, and if you see anything that looks like it's strating to smoke, shut off the heat! Fumes may be flamable, could make small boom though I don't think it would be serious, but hot plastics burn skin also.
If done correctly and thought put into this, it has worked well for me with smaller items and various pastics and I never had a problem. I have not done large items like blades, but I have pressed parts into shapes, or taken pieces of bent suff and straightened it this way, like broken plastic bowls, bake till mushey, press flat, make parts.
Maybe start small if you try this. Hope it helps people recycle some junk into good things!
