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Cleaning our plastic

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This topic contains 4 replies, has 4 voices, and was last updated by  Cloe M Bayeur-Holland 8 months ago.

Butte Metz btmetz

Cleaning our plastic

19/11/2017 at 07:49

We really need to put down some sort of standards or processes for cleaning our plastic for re-use.

We shredded our first batch Thursday of HDPE and PET in a semi commercial shredder.

I can tell you one thing the scrap plastic STINKS! I mean it smells extremely bad and many containers were used for household cleaning products, so there was a bit of a toxic brew in there.

I have seen some conveyors running plastic thru a tank of water with some lye that cleans the plastic and rids the paper labels.

Then it is rinsed.

It looks like there is a bit of work to be done to improve our capabilities to really recycle and process large amounts of plastic, as running 50 kilos a day just will not cut it, if we are to make a impact.

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In reply to: Cleaning our plastic

20/11/2017 at 22:26

Slow and steady wins the race I guess. Washing on a big scale does seem to be a big challenge.

If the plastics aren’t cleaned properly do they not bond/melt properly?

Can you mix HDPE and PET?

In reply to: Cleaning our plastic

22/11/2017 at 03:36

no you can not mix the two. Water contamination makes the plastic foam up. that is how EPS is made.

I got 17 kilos of HDPE yesterday. It is contaminated with dirt. I have soaked the red pieces (coke bottle caps) in water and a local bleach that has a soap in it. It is kinda clean but something better needs to be done.

I need to process roughly 30 kilos of plastic daily into usable products to earn a living.

At this point I am thinking it will be better to purchase from a processor.

In reply to: Cleaning our plastic

09/12/2017 at 02:55

I was thinking ocean salt water (to clean & get labels off) & then a one rinse of some kind, before the chop. Since most the bottles are collecting along shorelines & fresh water is limited world wide. But still there will need to be a sludge pond for all this washing residue.

In reply to: Cleaning our plastic

09/12/2017 at 22:50

has anyone tried shredding the plastic before cleaning it? i haven’t tried it, but i would like to try shredding it and then putting it in an agitation tank with water and cleaning solution, something adapted from a washing machine… i have seen people build machines like this for other purposes

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