Re: RE- Re: Polyethylene
Subject: Re: RE- Re: Polyethylene
Date: Sun, 15 Jun 1997 22:38:58 +0500
From: "Alfred A. Skrocki" <alfred.skrocki-at-cybernetworking-dot-com>
To: Tesla List <tesla-at-pupman-dot-com>
On Sun, 15 Jun 1997 17:48:22 -0400 Daryl P. Dacko
> Polyethylene is a thermoplastic, and will melt, and it is possible to
> recycle it.
This is the impression I have always had! Polyethylene is one of
those plastics that are BOTH thermoplastics AND thermo-setting
plastic. Bakalite by contrast is thermo-setting but it is NOT a
> Polyethylene and polyproplyene don't really 'melt', they (above a
> certain critical temperature) just get softer and softer. Usually
> you can't get them hot enough to flow by themselves without a fair
> amount of degradation of their propertys.
> The crosslinking you heard about is used to stiffen the polymer and
> give it propertys that it wouldn't have otherwise. If it were carryed
> out too far, the polymer wouldn't melt, true enought, just like
> thermoset plastics, but just a little helps...
If memory serves me there is an irradiated form of polyethylene that
is not a thermoplastic.
> A way you =could= recycle it would be to use what's called compression
> moulding. You make a frame the same thickness as the sheet of plastic
> you want to make, lets say 18 inches square and 90 mills thick. You
> cut out a hole in the center to leave a border arount the outside...
Your suggested procedure sounds good! With a little experimentation
it just might work! Thanks for the info!!!
\\ ~ ~ //
( -at- -at- )
Alfred A. Skrocki
-----( )---( )-----
\ ( ) /