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  • Users: NZBen
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  1. NZBen

    Large diameter pipe with small extruder?

    I'm wanting to make some long lengths of large diameter pipe around 450mm dia with a 28mm wall. I only have a small extruder and the die making company says it's not possible. My extruder has a motor of 10hp and I'm not sure of the output capacity, but am assuming close to 100kg/hr. I'm...
  2. NZBen

    Oversized extruder????

    I want to trial a prototype extrusion from polyprop, I'm only semi familiar with the extrusion process and have never officially operated a machine. I'm currently building up a die and I have managed to pick up a hardly used extruder from a university for a song. However I'm starting to be...
  3. NZBen

    How to create high vacuum cheaply - maybe?

    I'm wanting to generate a vacuum for purpose of making an LN2 dewar. I'd rather not buy a turbo molecular pump or diffusion pump if I dont have to. I've mentioned the idea to a couple of people who've thought it's dumb and wont work, but thought I'd try and get a vote here. I have a 2 stage...
  4. NZBen

    Simple pressure/temp eq

    I'm trying to figure out the temperature of air when it expands out of an orifice I have air at -30deg C and 2.5MPa, what temperature will it be when it expands to atmosphere? I presume if I can run it past a turbine it will become even cooler. The only equations I have - also take volume into...
  5. NZBen

    liquid CO2 injector for dry ice machine (how does it work)

    I have a picture of an inlet to a small asco dry ice machine and Am trying to figure out how it works. I think I may have it figured but am wondering if anyone else can shed light on it's pluming for me and why it's arranged in such a complex manner the image is found here ...
  6. NZBen

    CO2 purification

    I'm wanting to produce relativly small amounts of CO2 with a purity of at least food grade. I was hoping to do this by burning natural gas, compressing the exhaust and cooling through different temperature cooling columns. I figured in my simple brain this should work piece of cake - but...

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