Injection

Polymer Craft Machine Development
1

Why don’t you use air pressure to move the piston ?
It is a way to have high pressure with initial pressure about 8 bars, using surpressor process : with 2 sections you can generate high pressure : P1 = (P2xS2) / S1
P1 : pressure for injection
P2 : initial pressure from compressor ( 8 bars )
S2 : section of first piston (this piston move with de 8 bars from compressor)
S1 : section of second piston (this piston push the plastic for injection)

Thanks,
Erwan from http://www.reve-de-porsche.fr, and very interested to PET recycling.

2

Hello guys

I have seen a lot of good ideeas here, so, I consider that is fair to share 🙂
Here is my design on injection.

It needs an excentric clamping to enshure the tight fit bettwen the press and mould (is in design) and I hope to find a pneumatic piston for it.

Feel free to wright any oppinios, please 🙂

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3

Hi win,

that’s another item for the ‘to do’ list…. Pretty busy in the PP workshop lately 😉

We did n’t give it a try yet.
For the latest machine we focused on a redesigned manual one.

Injection Version 2.0

A couple of machines finished this week, so perhaps we have time in the next weeks…

Regards Kees

4

Hi Kees,

I look forward to your updates, I was given a pneumatic ram years ago with 63mm Ø x 500mm stroke, unfortunately it’s sat outside in the weather for the last few years. If you have success I may also build a pneumatic injection moulder. The best of luck 🙂

5

The injector with the bicycle parts is finished, so time to start with a other option.
The main part arrived yesterday by mail 🙂 a 40mm*540mm cylinder.

I keep you posted if it works ………

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6

Well, it seams that pneumatic pressure wont cut it 🙂
I have just spoken with some guys from Harting, it turns out that pneumatic pressure is a no no.
I was thinking maybe a step by step motor from a regular printer would do the job.
Of course, it will need assistence from a pc and a screw

8

Hi Dave
In this moment it is 300x300x360 mm
I have to decide how to assure sealing between nozzle and mold … I m thinking of a eccentric system
The piston will be driven penumatic or by leverage , still trying to make my mind 🙂