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In reply to: Materials worldmap

04/03/2017 at 14:17

Great Idea! May I also add new groups (e.g. Hardware stores etc.)?

02/03/2017 at 19:42

Thank you! Austria (Alps, Snow, Falco, Schwarzenegger, NO KANGAROOS!) is a Republic in the heart of Europe (as shown in the picture)


In reply to: Granulation

28/02/2017 at 17:40

So you need pallet-shaped plastic? Just shredding it is too inacurate?
Maybe let it cool after the extrusion and shred it again?

28/02/2017 at 17:32

Wow! Amazing idea! That is like a win-win-win situation. 🙂 The only downside I can see is fire resistance. As soon as it gets hot, the plastic would start to melt or even burn, which isnt good :/

In reply to: Ask Me Anything

28/02/2017 at 17:28

Hi Dave, are you still not using shampoo? 😀

In reply to: Plastic and Concrete

26/02/2017 at 22:03

@andyn yes, we are running out of sand. 2015 alone we used more than 15 billion tons of sand (about 2.000 kg per person). Unfortunately, we cannot use the sand from desert, because due to the friction inbetween the grains, they are round and cannot be used for concrete, the product would be too weak. So instead we use giant “vacuum-cleaner-boats” that collect the cornered sand from the oceangrounds, while destroying living habitats of millions of animals. Well done, mankind! :/

So, really great project @valentinalachner !

In reply to: PAT

21/02/2017 at 21:46

Hi! I think PAT. means patent… So no info about the type of plastic. 🙁 However, if it is a cap of a bottle (of water etc.) it’s most likely HDPE. But if you’re unsure I’d rather test it.

20/02/2017 at 21:04

I like, great Idea! 😀
If avilable, I would buy one!

Some proposals for designs:
-illustrated machines
-poster collect plastic (bring your clean sorted plastic)
-recycle symbols for PET, HDPE, PVC, LDPE, PP, PS and O

In reply to: Messages

20/02/2017 at 12:13

go to the top right corner, on your profile picture and click on “inbox”
then click on the name of the subject you want to reply to. scroll down, click on the white rectangular, write your text and hit “send reply” – done

In reply to: Dirty Plastic

19/02/2017 at 21:02

@sharma-sagar @snowpoff
you can recycle thin PE bags by taking multiple ones, melt them in the oven so you have one piece and then shred it (I think) 😀

19/02/2017 at 20:54

Wow! That sounds interesting!
However, (all I can do is a thought experiment) I see some difficulties in this. First, you need some sort of sensor that senses 1) that something is inserted and 2) WHAT it is. e.g. what are you doing with a tissue or a half eaten burger that someone silly would throw in? so you need a bin for everything non-wanted.
For detection I think the best thing would be a camera, since it can see the difference between plastic and waste. The coupon-making should be no problem, the only thing is to make it fake-proof. What comes to mind there would be (Internet connection needed :/ ) a barcode generator, that creates a unique barcode that is assigned with the maount of (money) it is worth ( I hope I did not misunderstand your idea. ) So then basically you need to connect the camera to a microcomputer (Raspberry Pi e.g.). The microchip detects the shape of a bottle and [example] the platform, where the bottle is placed turns left to throw the bottle into a bag or turns right to throw it away. I think the rest (connecting to the internet, printing etc.) is self explanatory.
That’s at least my first approach to it!

Please keep us updated, I really like your idea!

PS: Do you mean sth like this:?

15/02/2017 at 12:07

Hi there!
Looks good to me! The Gearbox you need totally depends on the motor and your needs for shreddering. In general, you can increase torque – which is needed to shred (more torque => stronger shredder => Less problems with thicker plastic) – by having a stronger motor and/or a greater reduction.
In the end, you shouldn’t end up with more than ~70RPM, slower is stronger, which is especially suggested for single phase motors, but (not worth mentioning) will lead to a slower shredder.

So there isn’t really a “best” motor + reduction to buy, it’s all about what you want to do with it. More kW or HP/PS will lead to a stronger shredder but will also consume more energy,…..

So there are just too much variables taken into that equation to give a good advice from a remote position. Maybe you can send some photos or information of the motors and gearboxes availible?

14/02/2017 at 17:20

What exactly do you mean by “a monophasic motor isn’t powerful enough for the shredder”? (google Doc) Basically torque matters and to my knowledge speed and torque are indirectly proportional to each other. For sure a triphasic motor is more suitable for the shredder, but by reducing the speed to 20-30 rpm this should then lead to 2x-3x the torque, which should be sufficient, or am I overlooking something?

In reply to: Germany what up?

11/02/2017 at 10:33

Hi Flo, I’m Flo too!
I live in Vienna, Austria, so at least it’s “only” 6 3/4 hours of train ride between the two of us. 😀
In Austria, we have pretty good recyling programmes too, but still, most of the plastics just get burned(Except for PET). So if you are interested in building a shredder, maybe we could order two sets of lasercut parts to save some Euros. 🙂

11/02/2017 at 10:12

Thanks @xxxolivierxxx and @trisaratops for welcoming me!
@lobbo ‘s project looks amazing, thanks for the hint! ( I now also know how to filter members by state! 😀 )

Viewing 15 replies - 241 through 255 (of 255 total)