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Rotomould recycling

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zippyRN View Drop Down
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    Posted: 04 Jun 18 at 9:43am
Originally posted by JimC

Originally posted by RS400atC

Anodised ali is among the most favoured for recycling, it's less problem than paint, plastic coating, alochrom and most of the other surface treatments.

In my youth I was briefly an industrial chemist. We were presented with (IIRC) a requirement to strip a nylon coating from aluminium zip fasteners to permit recoating where the original coating had failed QA. We didn't succeed in finding a formulation to do the job, and I wasn't allowed to send out my report which recommended dissolving the aluminium out of the nylon and starting again...


presumably in that  scenario -   you'd then 'dry' the  aluminium solution  and  throw  the  resulting  back into smelters ?
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Post Options Post Options   Quote zippyRN Quote  Post ReplyReply Direct Link To This Post Posted: 04 Jun 18 at 9:42am
Originally posted by JimC

Clearly then one should separate hulls and decks on old toppers and save them up until there are enough to make a delivery to a recycler cost effective.

And defining a boat that will hopefully be used hundreds of times over its lifetime as single use is ****wit stupid...

Possibly what would be ideal would be for the manufacturers to provide a service by which they'll pick up an old boat while delivering the new one, and the old ones get hull and deck cut apart, stacked in a corner of the yard then recycled in batches.


in the case of the topper  where  the hull is  mainly the two monolithic  injection mouldings  splitting  for recycling  makes sense as the only 'mixed colour' part is the  seam area which iirc  has  wire in it  to aid the bonding  process 

boats are not 'single use 'plastics  -  that's  straws , (cheap) plastic cutlery,  cheap plastic / foam  takeaway containers  , plastic cleaning product / toiletry / cosmetic packs  etc etc etc 
 
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Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 01 Jun 18 at 12:16pm
Originally posted by RS400atC

Anodised ali is among the most favoured for recycling, it's less problem than paint, plastic coating, alochrom and most of the other surface treatments.

In my youth I was briefly an industrial chemist. We were presented with (IIRC) a requirement to strip a nylon coating from aluminium zip fasteners to permit recoating where the original coating had failed QA. We didn't succeed in finding a formulation to do the job, and I wasn't allowed to send out my report which recommended dissolving the aluminium out of the nylon and starting again...
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Post Options Post Options   Quote 423zero Quote  Post ReplyReply Direct Link To This Post Posted: 01 Jun 18 at 11:20am
No Noah
I stand corrected
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Post Options Post Options   Quote Noah Quote  Post ReplyReply Direct Link To This Post Posted: 01 Jun 18 at 11:10am
I stand corrected  Embarrassed
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Post Options Post Options   Quote RS400atC Quote  Post ReplyReply Direct Link To This Post Posted: 01 Jun 18 at 10:35am
Originally posted by 423zero

The anodic film created in anodising is 100% pure aluminiumAnodised aluminium can be recycled through simple re-melting without any intervening process. ... The recycling of composite panels is even more complex because of the extraction and destruction of the core material.


Actually, the anodised surface is aluminium oxide with a bit of dye in it. Probably some oxides of whatever the aluminium is alloyed with, e.g. silicon, magnesium etc.
Anodised ali is among the most favoured for recycling, it's less problem than paint, plastic coating, alochrom and most of the other surface treatments.
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Post Options Post Options   Quote 423zero Quote  Post ReplyReply Direct Link To This Post Posted: 01 Jun 18 at 10:14am
The anodic film created in anodising is 100% pure aluminiumAnodised aluminium can be recycled through simple re-melting without any intervening process. ... The recycling of composite panels is even more complex because of the extraction and destruction of the core material.
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Post Options Post Options   Quote Noah Quote  Post ReplyReply Direct Link To This Post Posted: 01 Jun 18 at 9:59am
AIUI Aluminium, once it's been anodised, cannot be melted down and recycled...
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Post Options Post Options   Quote RS400atC Quote  Post ReplyReply Direct Link To This Post Posted: 01 Jun 18 at 9:02am
Originally posted by piglet

My single use comment was not tongue in cheek at all.
Rotomould boats are a single use of the material if it is not recycled.
This is also true of composite boats but there is no system in place for bulk composites recycling, yet.
My original point was/is Rotomould polymer is a recycleable material
but we are not.

Why not???

I have the job of disposing of an end of life Pico training boat.


The problem is, your end of life pico is probably 'end of life' because it's seen a lot of sunlight and gone brittle?
That tends to mean it is degraded plastic and not directly recyclable, it has chemically changed, you cannot just melt it down and mould something new as you might with aluminium.
You can use it to make something which demands very little strength from the plastic perhaps.
This is why things made from 'recycled' plastic are usually crude and heavy, like park benches.
It's borderline 'greenwashing' in some cases, more about storing the waste off the books than making an actual product.
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Post Options Post Options   Quote Rupert Quote  Post ReplyReply Direct Link To This Post Posted: 01 Jun 18 at 7:42am
Single use suggests 1 sail, then bin, like a cucumber plastic wrapper. Using a boat for 10 or even 20 years (or 5, maybe in a sailing school) would seem like good use compared to almost any other plastic product. If it can be turned into bricks, or pothole filler at the end of that, all the better.

As to why Topperand Laser went rotomould, it was because they kept on losing money on their racing boats, barring the main two. They probably got fed up the class associations, too!
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