[GreenYes] Re: Mouth Smaller at Neck - Why?

["Reindl, John" <Reindl@no.address>]

The reason for the distinction is that some are blow molded (bottles) and some are injection molded (jars) and the processes require different viscosities, and hence different softening and melting temperatures. The recycling process requires heating the material, and the material with the lower melting temperature will "burn" at the temperatures required to soften the higher melting temperature plastic.

This is not a hard and fast rule -- different recyclers can handle different mixtures -- but that's the basic reason.

John 

> -----Original Message-----
> From: GreenYes@no.address [mailto:GreenYes@no.address]On
> Behalf Of M.Simons
> Sent: Friday, January 05, 2007 5:41 AM
> To: GreenYes@no.address
> Subject: [GreenYes] Mouth Smaller at Neck - Why?
>
>
>
>
> Greetings,
>
>     A lot of plastics recycling programs specify that they 
> only collect 1 & 
> 2 plastics that are "smaller at the neck than at the base" otherwise 
> referred to as "narrow-neck" bottles.  However, I have not 
> yet found a 
> reasoning for such a thing.  If something is a 1 or 2 
> plastic, why does it 
> matter the size or shape of the item?  I would guess it has 
> something to 
> do with the machines they use to sort with.. but I don't know 
> why else 
> they would say this.  If 1 & 2 plastics are relatively easier 
> to recycle 
> than others, and are having a higher demand, increased 
> economic value, 
> etc.. why would they not wish to collect them all?
>
> --
> MS
>
> > 

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