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Discuss any sort of mechanical stuff here: positioning systems, gears, extruding methods, etc.
Re: Dual Action extruder - 16 years ago
Andres is right, the main pressure is coming from the auger, not the plunger. I forget how they dealt with backflow on the original. They were squeezing out a liquid, not a viscous mass. It might be that the problem of backflow was moot due to the non-compressability of water based meds. An easy work-around would be to make the channel from the main feed into the syringe section longer. For ourby StormRnr - Mechanics
Dual Action extruder - 16 years ago
I was at a trade show this summer, and saw a design that I haven't seen in these forums. The demonstrators were using the mechanism to give precise measurements of medication, but the principles are the same. The concept is to send the plastic feed into a syringe type chamber after it gets melted. The benefits were that the extrusion rate could be more closely controlled. Simply moving the plunby StormRnr - Mechanics