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What about using the gas to head oil then piping the hot oil through/around the area that needs heating. Controlling oil temp would be easier than a direct flame as you would heat a reservoir of oil. An engine oil pump should be easy and cheap to get. An oven could even use a heat exchanger as an element.
Wouldn’t the plastic act like a grease?
A gas oven? Temperature control will be harder and plastic smoke is flammable, so very risky.
Coconut oil might be burning off. It starts smoking at 350f 180c and your ovens at 220c.
Refined soybean and sunflower oils have some of the highest smoke points, at around 450°F 232°C, and avocado oil’s smoke point is 520°F 270°C.
A fish&chip shop might be a good place to get cheap cooking oil.
A vacuum chamber would be great for pulling out those air pockets, but complex to build.
I’m a visual artist mainly working in sculpture and was thinking of using soft plastic bags combined with sand or other materials to form sculpture. Kind of like working with a plastic asphalt mixture. Even if i only made small batches they could be combined by heating the cold material with a hot air gun.
@gcadou I have been using a kitchen blender and was thinking of scaling it up with an angle grinder as they are easier to get than an electric mower. It seems like the cheap and easy build. The blender blade design is needed to keep the plastic mixing.
I was also looking at buying a plastic shredder from aliexpress but I can’t afford the $2000+nzd and the 2nd hand market in New Zealand for these is empty.
The CNC cost of the precious plastic is also beyond my budget, so have been looking at alternatives for that style of machine. I was thinking of something like these milling heads at around $20 each might do, if a number are combined into one shaft. Or a Woodworking Finger Joint Shaper Cutter <= which could cut its own key(?- the grooved slots that the blades pass through and the plastic doesn’t).
So many options, I might start with the angle grinder blender because it’s easy even if it requires more operating time in loading and unloading the bucket.