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Melt Fracture

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Topic: Melt Fracture

dvansolkema
Member

Posts: 1
From:West Olive, MI. USA
Registered: Sep 2007

posted September 14, 2007 08:54 AM

Does anyone have advice related to creating Melt Fracture (surface texture - both sides) in PVB film extrusion (.020" gage). As pertains to A.) Die design, B.)Processing strategies, C.) Material composition or additives to induce MF, or D.) other.

Thank you,

Dan Van Solkema

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Tom C
Moderator

Posts: 891
From:Brodheadsville, PA USA
Registered: Jun 2001

posted September 18, 2007 04:55 AM

There is plent of information and research out there regarding melt fracture. The issues is related to high shear stress at the polymer-metal interface.

Shear stress can be lowered by;

Lowering the melt velocity
Decreasing the viscosity
Inceasing the slip between the polymer and the metal

There are many lab tests, modeling tools, die coatings and additives that can help.

------------------
Best Regards,

Tom Cunningham

www.ExtrusionTechnicalServices.com

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