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



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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