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Material research Injection
- This topic has 9 replies, 6 voices, and was last updated 4 years ago by
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Hi!
In this topic you will find tests that are done in our workspace in the Netherlands. The heart of Precious Plastics.
We will test each machine and explore other news ways of using them. Every machine will have his own slideshow were you can follow new tests about plastic. Extrusion, Compression, injection and the shredder(soon). Every test will be accompanied with some photos and little information about the tests.The slideshow will be updated with new experiments regularly.
They will mainly show material properties, not finished products.
Hope you enjoy!
Mathijs
New test online with translucency on the injection machine. Nice to add some colour to see the flow
Attachments:
Great job! Really impressed by how transparent some of the plastics actually came out
@timslab, thanks! I think i can be even more transparent when I clean the injection machine, set the temperature lower and wait for a little longer to let it melt and not burn the plastic.
@mathijsstroober Looks like the best plastic to use for injection is PP and PS.
Did you successfully inject PE plastic?
We tested some stuff with PE aswell. It shrinks a lot so you get a more shrinkmarks. It is also bit tougher.
@mathijsstroober, good job, buddy! The transparent one looks awesome. I did not expect it to be like that)
The usual guide for industrial injection moulding states that when switching between material types, or even colours of the same type of material, the injection barrel needs to be cleaned by purging some of the material out of the tube. This is quite straightforward and logical. In my experience this is done either by PP or PS.
The black spots look like either contamination within the plastic pellets or the burned leftovers in the barrel itself.
Now I’m wondering, what barrel cleaning procedures were performed during your experiments? Were there any?
Hi @jegor-m
Normally we heat up, put new material in and press till the new material is not mixed with old (I know we create a small amount of mixed plastic, not very good)
That specific time, PP was burnt and did not want to come with the PS. Then I heated up de machine 250 C°, and put some cloth true the tube. Till the cloth came out clean.
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