M.F.R. Question

[Coryhoeppner]

With those MFR's shown. I have personally seen a 20% MFR change within 1 gaylord before. The number placed on your incoming paperwork is simply an average for the lot of material that filled your purchased container. Having a viscosity shift that is large is referred to as "wide spec". Decoupled molding with cavity pressure sensors is an excellent way to combat the molding issues that I assume you are having.

[Suhas]

Good Q!

> MFR testing is very subjective. Each person is going to get a different result since there are a lot of variables. Even the way you pack the pellets will make a difference.

> Agree with Cory above on using a pressure sensor if you have a very critical job and have a resin with viscosity variation.

[rickbatey]

I remember a resin supplier at one time would pull samples and watch the MFR of the resin. Typically you get low at the start- of a production run and high at the end. So they would go back and post blend the resin to get a better average of the MFR.
Rick