🇪🇪 Precious Plastic Estonia
Today we have built the shredder and did a test run. A couple of things still to be tweaked, but overall we managed to get our first batch of shredded plastic.
Thanks to @davehakkens and the team for making this possible.
We would be happy to help anyone who is planning to start building the machines soon with some before-assembly advice.
December 2017 update: Shredder, Injector and 5/7 of the Extruder ready.
January 2018: Moving part of the production to Tallinn.
March 2018: The last – Compression machine almost ready.
May 2018: Started making wallclocks.
Sep – Dec 2018: Not so active season, looking for sponsorhip deals.
Estonian team: @jegor-m; @maximmm; @igor-smog; @dannydadog
Instagram /// Facebook page /// BAZAR page
thanks for posting the errors! I think we had 2 of these moulds and with one we increases the diameter size of the “injection shaft” to make the plastic flow in easier. Not sure which one I send 😅 But that could help? Mould heating definitely helps but is such a hassle to do every time. Also @jerzeek might have some tips on this one!
🌎Update N.22 – Mess
For those of you who wanted to see how messy our garage is – this is ‘relatively clean’ state. Not much can be otherwise said apart from that we’re building a custom compression machine, photos soon to follow.
*panoramic photo stiched by a trial version of Autopano Giga. Quite a good software, in case anyone asks.
What’s happening here… winter sleep?
Much love from the south 👹
Haha this story is awesome !!!
You are crazy to accept an order of 500 pieces but really good move and exempl. Thing if know i have the same i make the same choice becaus you made it !
Hey and just for jokking, badg is not a small thing ? Heart about something like we don’t do small object with P.P. 😉
Cheers form switzerland
waaw looks pretty nice ! Could we visit? 🙂
🌎Update N.18 – Bottle caps
We sorted the bottle caps by colour, with blue being most common.
How do you guys deal with the rubbery layer inside the bottle caps?
Current plastic stock status in the photo.
🌎Update N.17 (2/2) – HDPE Coasters
Next was a test of grey HDPE. Three temperature sets were used (170/180; 190/200; 220/230 °C). The results are shown in the photos attached (in the same order).
We added some pieces of bottle caps (white, blue and yellow) just to give it a bit of colour. At least we tried. This set of coasters got a very rough texture. It was very hard to push into the mould.
Surface flat and low roughness. Warping due to increased temperature becomes visible. Injection was not performed in one movement. It was paused for a second and then continued. This is clearly seen from the injection lines on the coaster. Second one is not filled as it got too cold to flow.
Our metal mould is far from perfect. If more plastic is squeezed into the mould, it would fill every corner. This try was done with the most heated HDPE, hence better flow. The overheating warp is quite bad on this one.
What could be done better?
Perfect temperature range is yet to be established.
Injection has to be in one quick move.
Indicator hole should be a good way to see if the mould is full.
Ambient temperature has to be adequate.
Mould temperature to be at least 20°C (better if 30-50°C)
All the coasters up until now. Only 3 of good enough quality.
Yeah, same here in Dresden. Freezing cold…
Our solution -> Building the Compression:)
I hadn’t look at this thread, you got a great information repository here. I had the same problem with PET bottles sliding into the edges of the shredder knives. I was planning to melt the bottles in an oven prior to shredding them to avoid this issue but haven’t had a chance to test this out yet.
I think it’s very good idea
@jegor-m your team have done an amazing work! I hope the mechanical engineering department of our university would success also we are currently building each of the precious plastic machine! By the way, in your compression machine how long did the baking time took in order to fully melt the plastic?
low-density polyethylene is typically 105 to 115 °C
I think this info exist in an other post, about plastic materials in the forums.
Here is one: https://davehakkens.nl/community/forums/topic/types-of-plastic/
Sorry jegor-m for hijacking your post :S
Like always awesome!
General practice is to avoid mixing various types of plastic in one item as it makes it unrecyclable and cannot guarantee item’s structural integrity. It might just fall apart as the bits won’t stick to each other.
Smoothness is mostly controlled in the fabrication process itself through setting the right temperature; having a smooth mould etc.
The first step is to separate the plastic. By product type first, then with some research by material type as well.
Also don’t forget there is so much information here on the forum, look something up.
Good luck with your recycling!
Wow!!! I would love to start this where I’m living. My idea was to collect plastics that have washed up on the beach but after reading realize certain plastics melt together more smoothly than others. Gosh where do I even begin?
Nice work, I like your documentation.
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