Re: Finite Element Solution to 1D Polymer Film Problem

You could, for example, search for a given polymer for the property you are looking
for, e.g. thermal conductivity, at: http://www.matweb.com/search/SearchProperty.asp?e=1

or, if you know the supplier of your polymer, you could ask him for
such an information for a specific grade of polymer ...

"Drago" <[EMAIL PROTECTED]> schrieb im Newsbeitrag news:[EMAIL PROTECTED]
> Greetings!
> I am having a hard time finding heat transfer coefficients (k) for
> various polymers (nylon, polyester, polyethylene). Would anybody know
> an online source?
> 
> I am trying to perform finite element methods to determine the
> required seal times at various temperatures on packaging lines. Has
> anybody perfomed this type of calculation before or know of an
> available calculator/program?
> 
> Generally, packaging machines have dwell times of approximately 0.4+
> seconds with sealer bar temperatures of 170-175 deg C. The sealing
> material, generally polyethylene in this case, requires to be raised
> to approximately 140-145 deg C in order to achieve an even seal. The
> back side sealer bar is normally kept at room temperature, or slightly
> above. The pressure applied to the sealer bar can vary, but it is
> assumed that full contact is made between the sealer bar and the
> polymer film and that the surface of the film reaches the sealer bar
> temperature immediately.
> 
> Thank you for your suggestions and opinions.