The process is T-die and base resin is PP.
Temp. condition is 300 degree, Line speed is 100rpm.
MIF is 15~18g/10min.
The PP composite is including Recycling PP about 30%.
We can not reduce the recycling PP content.
The surging problem is a real pain in the neck.
Please help me.
And I confuse the surging with Melt fracture..
I am sure that that problem is surging trouble.
But What is melt fracture?
Are those same problems or Not ?
Extrusion surging or melt fracture can be caused by feedstock, feeding, conveying and/or melting issues, which you may have to address step by step. I suggest you get your hands on books like the following, for troubleshooting advice:
-> sample page https://www.hansergardner.com/sample/1-56990-396-4.pdf
Go to "http://books.google.com " and search for "extrusion surging" to "surge suppression" to obtain book-links to:
On melt fracture see:
Additives for eliminating melt fracture are suggested here:
In short: could your surging problem be related to:
* "too large" differences in pellet shape and/or size between virgin and recycled PP
* "wrong" feeding zone design
* "wrong" screw design and/or screw vs barrel surfaces
* "wrong" temperature profile
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