Re: Finite Element Solution to 1D Polymer Film Problem

[EMAIL PROTECTED] (Drago) wrote in message 
> John, I see how you are looking at this. But to simplify things, lets
> assume that when the seal layer reaches a specified temperature, we
> obtain a good seal. Obviously this is an oversimplified analysis, but
> it should be able to calculate the minimum time required for the
> sealant to reach a sealable temperature. My objective for this
> analysis is to set guidelines (generally minimums as most companies
> are trying to use too little dwell times-and speed up production) for
> customer packaging machines. There are also constraints on the maximum
> allowable temperature on the seal bars due to film
> deformation/burning.

This is definitely more approachable.

I'm not sure that the Polymer Handbook would have the heat transfer
constants that you are after or not. I don't have access to that book
anymore (unless I can arrange with my boss to make a special trip to
the University) :(  Maybe someone else in the newgroup can help.

To get a good seal you will also need to allow time for the
interdiffusion of the molten sealing polymer, not just for the time to
get it up to the molten state. This will certainly vary from polymer
to polymer, since it's basically proportional to the melt viscosity.

Good luck,
John