How to prevent PET from melting?

[FusSioN]

Hey guys, I have this Science Investigatory project, and I have already finished making my machine in which it enables the user cut the bottle and turn it into a thread.

So if you don't mind me asking, what change can I do to prevent it from melting?

Any reference can help.

[Cameron]

Can you explain your method for cutting?  I'm assuming it involves some form of heat.  Thing is, you can't change the melting point without modifying the chemical structure of PET, so you'd have to change your method.

[FusSioN]

https://www.youtube.com/watch?v=hQeeJEpBYsg

I'm trying to use that video as my basis, as for my innovation I wanted to make PET the closest alternative to Polyester. PET has some characteristics of Polyester, which is waterproof and lightweight. What I wanted to do is like make it adaptable to certain environments.

[Ace]

Classic Nature article on PETs from the late 70s. Should really read this if you are into that sort of thing. Just search nature and science for more goodies.

http://www.nature.com/pj/journal/v12/n2/pdf/pj198015a.pdf?origin=publication_detail

[FusSioN]

Thanks ^_^

[FusSioN]

Here's how the machine turned out. I have some trouble, it's not so user friendly. I have to push it against the blade instead of pulling the thread like in the video, and the thread cuts itself!

The machine works though.

Any help?