Re-Extruder
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Release status: Concept
| Description | Plastic scrap Re-Extruder
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| License | unknown
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| Author | |
| Contributors | |
| Based-on | |
| Categories | Recycling
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| CAD Models | |
| External Link |
Contents
Introduction
The Re-Extruder project is intended to be a companion piece to the RepRap, a machine that can take scrap plastic and re-extrude it into feed filaments. Like the RepRap, it should be as simple as possible so it can be built at home from inexpensive and commonly available materials.
I have identified 5 essential components:
1. Power supply
2. Melting pot or crucible
3. Extrusion orifice
4. Plunger or piston to force melted plastic out
5. Microcontroller and programming
Power Supply
I have about 40 transformers with 120V/240V split primary and 23VAC 8-10A secondary, or about 180-240 VA. My initial power supply designs will be built around these transformers, 'cause I got 'em. They will produce about 32VDC, rectified and filtered. Buck-mode switching converters can produce +5V and +12V to power the microcontroller and ram motor. One large P-channel FET will switch the crucible heater power.
Crucible
My idea is to use a piece of galvanized steel water pipe as the melt chamber. A short piece of pipe threaded on both ends, commonly called a "nipple", can be
