Blending!

The juicer we showed you wednesday didn’t work that good. Today, we brought something different: a cheap, secondhand blender.

We tried to blend the milk bottle HDPE in different sizes and in both straight and fumbled state. This had some mixed results (we will eleborate these next week), but most important: it worked!

Next thing, we have to discover with size the milk bottle has to be reduced to, to be able to extrude it. Also, we will have to look at the consequences of the impact the knives have with the plastics. Although the temperature changes seemed to be pretty low, there knives were getting a bit warmer. Does it change the material properties of the plastic due to temperature changes? How fast will the knives go blunt? What can we do to prevent the heating (for example adding water to the plastic while blending or putting the plastic in a refridgerator)?

Have a nice weekend!

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9 Responses to “Blending!”

  1. nophead Says:

    Interesting. I tried the same experiment some time ago with a very old Kenwood liquidiser and it had no impact at all. There must be a critical speed where it stops stirring the bits around and actually cuts them.

    I got better results from a paper shredder.

  2. Brian Korsedal Says:

    You should look on Youtube for the “Will it blend” video series. It’s a sales promotion for a really strong blender. The guy blends all sorts of things, a rake, an iphone, glowsticks, lighters, marbles…. seriously everything.

    Their blender turns everything to dust. Maybe you just need more power?

  3. peter Says:

    this may be a rediculous idea, but i wonder if adding a little bit of water might help the blending process? normally if you make a smoothie (or, really, blend most things), i think it tends to work better if it’s in a liquid. in this case, if you just added a little water that averaged being about half way up the blades, then the HDPE pieces might tend to float to that level, and be exposed to the sweet spot on the blades?

    just a thought!

  4. reprapdelft Says:

    @nophead How big were the pieces you tried to blend? We tried different sizes, and we noticed the small pieces were indeed just stirred around more. The big pieces we fumbled were shredded the best. How much watt was your blender?

    @ Brian Korsedal We saw the videos indeed. We looked up which blender they use, and it is a 1540 or 2400 Watt blender. It just turns everything to dust, which we don’t want to. Our blender is 350 Watt. Probably there is an optimum.

    @ peter We tried blending with water, but that was more of a cooling issue, not because of the ‘sweet spot’ you mention. Everything in the blender gets thrown around, even the water, so you can’t speak of the pieces tending to float at a correct height when the blender is turned on.

  5. evilmatt Says:

    Have you considered using something like a coffee bean grinder. That seems more purposed for the task you want to accomplish taking hard solid things and grinding them into a fine power, blenders (ignoring the stupidly powerful ipod blending devices 😀 ) seem more designed for softer materials.

  6. reprapdelft Says:

    @ evilmatt You’ve got a good point there, but our starting point was to not turn it into powder anyhow. Rolf Koster, the plastics expert we work with, has told us that strange things can happen once plastic is turned into powder and becomes electrostatic. It can react very strange to outside influences like temperature, it may even be unhealthy. Our own argument is that powder is very annoying to work with, because it sticks everywhere (because of static properties). You would have to clean a lot to be able to use it normally. When using different kinds of plastic after each other, this would be very hard.

  7. matt Says:

    garbage disposal maybe?

  8. careers in plastics Says:

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  9. Plastic Raw Material Says:

    Hey This is great one Thanks to shared ! I will bookmark your information page. Thanks

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