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I used to operate and maintain industrial extruders
Our extruders had an exhaust port just after the hopper
If too much pressure built up it would exit via this port but it can create an awful mess
Thought of using a Chinese manufacturer.
Quick turn around and cheap
The extruder builds pressure so closed moulds as used in the injector are not suitable
Excessive pressure build up could lead to and eruption/explosion and injury.
Excessive pressures would also look for a path of relief which may end up filling the hopper with molten plastic. I have seen this in industrial extruders and it makes a mess
Moulds would need an exhaust port for the plastic
When plastic appears at the exhaust port the mould is full
Wayne from Sydney here
One of my colleagues showed me this great idea
I am currently looking closely at designs and costs
Ultimately we would like to build a plant at our school for our Design and Tech subject to enable students to progress all the way through from idea to design to production to market
This will part of our S.T.E.A.M initiative (science, technology, english, arts, maths)
The enviromental aspect is also not only awesome but important.
Considering comment above from @andyn regarding motor torque estimate of 50 – 100nm I found this Single Phase 0.55kW 0.75HP 70rpm Electric Motor and Worm Gearbox on ebay
I tend agree that the motor in the specifications seems overated.
Using the following equation thats 75nm
Torque in SI units can be estimated as
T = PW 9.549 / n
T = torque (Nm)
PW = power (watts)
n = revolution per minute (rpm)
Single phase which is better for most application other than industrial where 3 phase supply is available
Half the price of specified motors on eBay