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Active Contributor

Join Date: Sep 2010
Posts: 17

Polyethylene Pellets Upgrading

03/06/2011 6:42 AM

We manufacture polyethylene and consider any products exit from the system to be scrap.

Scrap could be samples disposal after usage, overflow from the process or any other source.

We think to upgrade this type of scrap to what we call non spec. in terms of cost the off spec is higher than scrap in value.

Is there any practice or idea supports our concept. What do you think?

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Guru

Join Date: Oct 2010
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#1

Re: Polyethylene Pellets Upgrading

03/06/2011 8:25 AM

Can you take the scrap and "remanufacture" it to be polyethylene pellets in full compliance with the specs (i.e., so you can sell them to your customer).

If so, it is non-spec material and the value of it is the value of polyethylene pellets less the cost of the remanufacturing.

If you are trying to sell the non-spec products to someone, the question then becomes one for them--what would make your scrap product worth more to them than their scrap value. Talk to them--maybe you can increase the value by some fairly simple things, like sorting it.

On the other hand, you, as a manufacturer of polyethylene pellets, are most able to convert the non-spec product into something more useful. If you can't do it, I'm guessing they can't either.

Also, are their grades of polyethylene pellets sold for different reasons? Maybe you can complete the manufacturing process (to convert the scrap to pellets) and sell it as a lesser grade material.

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Guru

Join Date: Oct 2008
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#2

Re: Polyethylene Pellets Upgrading

03/06/2011 10:01 AM

If the material is free of contamination, it can be reused. But if you advertise your material as 100% virgin PE, then you'll have to find other uses for it. Most thermoplastics can be reprocessed at least once without too much degradation.

Reground material is usually added to virgin material in some ratio, depending on customer and end use requirements.

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Active Contributor

Join Date: Sep 2010
Posts: 17
#3

Re: Polyethylene Pellets Upgrading

03/06/2011 4:11 PM

Thanks guys for such good answers

Actually our scrap is already pellets but they already out of system for lab analysis and you may think this is low quantity but we have many pelletizing systems and I can tell this quantity exceeds 10 T/month and also we have overflow from or process (screeners, dryers...Etc) and all come with contact to dust, dirt, sand in ground. If we try to re-pelletize these materials again, we may contaminate our process equipments and leading to S/D for cleaning. The quality of such pellets is on spec sometimes with high value additives in them. I'm thinking to blend these materials with decided of spec with not more than 20% weight. But also I can't find economical or best practice around. By the way, our non spec pellets sometimes contains streamers, contaminations, black spots so it's ok to have the scrap as non prime but we need to find a good way rather than selling our scrap with cheaper prices.

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Guru

Join Date: Jun 2006
Location: Ottawa Canada
Posts: 1975
Good Answers: 117
#4

Re: Polyethylene Pellets Upgrading

03/07/2011 10:30 AM

I would find a product which uses only contaminated scrap, and reserve special tooling to use only that scrap. That will allow you to create a product, and not destroy any existing equipment with dirt or sand.

There are many machines which are happy to use "dirty" recycled thermoplastics. They make interesting and useful items like rope and screens...all items which have more value than scrap material, and will pay for the machinery fairly quickly.

This is sort of a "first principle" of factory design. I don't want to be more specific because YOU know more than any of us WHAT you can make and HOW you can sell it!

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