Forum Replies Created
Sorry, can’t tell you exactly where to find that info, but by searching in the web should be enough to get a better idea of all the process and technical details
Yes, that’s LDPE or LLDPE. The process is always the same: shred, clean, dry, compact and re-palletizing. For this material it is important to pay more effort/attention in the dry and compact process. Do you want to recycle it by your own or in an industrial way? I mean, it is just a personal project or are you thinking in operating as a business?
My name is Vincent, not Plastic Consultant XD
I prefer not to mention the company I work for, I don’t think this is the appropriate place.
How did you come to the conclusion that “sorting may become a failure”? Please elaborate 😉
Fumes of melted plastic are not a risk for enviroment.
Moreover you can see it from the other point of view: if you don’t melt plastic, the plastic can’t be recycled. If it’s not recycled, in the best case scenario plastic would be burried in ladfills or burned down (burned! not melted!) in some incinerator, which is lot more dangerous to the enviroment than some little fumes from melting.
You can recylce (melt) your plastic without any worries 🙂
Hi, so the fumes are almost always toxic?
No, that’s not what I said. I’d get all precaution just in case but, unless you are working with PVC, shouldn’t be a big concern.
For example, safety footwear is really needed in all warehouse? Probably not, but just in case lot of companies force workers to wear them.
What I wanted to say is better safe than sorry.
Enviroment has much bigger concerns than melted plastic
Ups, sorry. Didn’t see your question.
I’d always take precautions with any kind of fumes coming from melted plastic, working in a good ventilated place, wearing a mask…should be a standard approach.
As you say there are “more toxic” kind of plastic, for example PVC, but take into account that also the ink of printed plastic may be very dangerous. That means, unless you are working with clean plastic, you should always do your work as safe as possible and thus take all precautions needed.
Well, generally speaking the process goes as follows:
collection of plastic and possible grouping for material and color; pre-washing; label remover; metal separator; categorization; shredder; washing; dryer; silos.
So usually labels are removed before shredding, for an industrial process there is a machine that do that automatically (for example: https://goo.gl/EVKeZ1)
It depends on the condition of the material, in the recycling industry usually plastics are separated in 2 groups: post-industrial (which is considered “clean” plastic) and post-consumer (“dirty” plastic). In your case I don’t know which kind of plastic are you inclined to use, but I guess it should be enough by using a solution of caustic soda (around 2%) in hot water (85ºC). You can also add a detergent to the solution. Very important is to employ a “shake-movement” while washing (same operating principle as in a washing machine), which will improve the result.
After the washing process, the plastic should be rinsed to eliminate any trace of the substances previously used or impurity.
It is also very important to properly dry the washed plastic before pulverize it, in the case of LDPE it is a good idea to use also a densifier.
To use recycled plastic in a rotational moulding process, it is important to know the characteristic and fluidity of the plastic used. To improve the output it may be a good idea to add additives and/or pigments.
Good luck with your project
ups, sorry didn’t read that before. Don’t know if you still need the information.
Sorry I don’t know any business that could be interested. You can still start your own, I advise you to get as many information as you can regarding the process for the plastic you’d like to recycle. Moreover you can buy 2nd hand machinery, which will save you some money.
It depends on the plastics you’re going to recycle. There are process where is better to clean plastic before, others where is better after and others where you need to wash it, shred it and then wash it again.
Hi @javierrivera, sorry for my late reply.
The cleaning and washing is specially mentioned on the release of the v3 container workshop
OK, probably I missed that.
But how thorough do you think the cleaning has to be? Water and soap or other chemicals to wash them perfectly clean?
It depends a lot on the type of output you’d like to get. For example as far as water bottle, I think soap-washed should be enough. But with other type of substance (like oil or bleach for example) it should be applied a better clean process. First of all to get an adequate raw material and produce better quality products, and then to avoid any damage to the extruder (you can find yourself changing the screw of the extruder quite often if working with dirty material).
What do they need to be marked food safe?
Forget about that, not even the industrial process can produce food safe recycled plastic (actually they are starting now with a new patent, but it still in the beginning. Until few years ago the FDA forbid all recycled plastic to be used in direct-contact with food).
If your goal is to recycle the PE, then do as jerzeek said.
Unfortunately the PA6 should go through a process of de-polymerization to be fully recicled, thus your best option is to bring the net to the closest PA6 recycler.