Skip to Main Content
U.S. Forest Service
Caring for the land and serving people

United States Department of Agriculture

Home > Search > Publication Information

  1. Share via EmailShare on FacebookShare on LinkedInShare on Twitter
    Dislike this pubLike this pub
    Author(s): Sonal S. Karkhanis; Nicole M. StarkRonald C. Sabo; Laurent M. Matuana
    Date: 2017
    Source: Journal of Applied Polymer Science. 134(34): 45212-45222.
    Publication Series: Scientific Journal (JRNL)
    Station: Forest Products Laboratory
    PDF: Download Publication  (821.0 KB)


    Processing strategies were developed to manufacture poly(lactic acid) (PLA) blown films without melt strength enhancers (MSEs). The effects of processing temperature on PLA’s melt properties (shear and elongational viscosities), PLA grades, and other processing conditions [ratio of take-up roller to extruder’s rotational screw speeds or processing speed ratio (PSR) and internal air pressures] on film’s blow-up ratio were examined. Experimental results indicate that extrusion-blown amorphous and semicrystalline PLA films can be successfully manufactured without MSEs by controlling melt rheology through processing temperature and other extrusion processing conditions. PLA processed at lower extrusion temperature had higher melt viscosities, which favored the formation of stable films depending on the PSR and internal air pressure used. Inappropriate control of PSR and internal air pressure led to unstable films with various processing defects such as melt sag, bubble dancing, or draw resonance, irrespective of the lower extrusion processing temperature.

    Publication Notes

    • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.


    Karkhanis, Sonal S.; Stark, Nicole M.; Sabo, Ronald C.; Matuana, Laurent M. 2017. Blown film extrusion of poly(lactic acid) without melt strength enhancers. Journal of Applied Polymer Science. 134(34): 45212-45222.


    Google Scholar


    Blown film extrusion, melt strength enhancers, poly(lactic acid), rheology

    Related Search

    XML: View XML
Show More
Show Fewer
Jump to Top of Page