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20/05/2016 at 04:40

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

15/05/2016 at 04:34

Thought of using a Chinese manufacturer.
Quick turn around and cheap

15/05/2016 at 04:24

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

In reply to: Aussies networking

13/05/2016 at 17:07

Hey guys.
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.

In reply to: Motors

13/05/2016 at 16:53

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

Viewing 5 replies - 1 through 5 (of 5 total)