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Role of Rheology in Film Blowing and Sheet Extrusion

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Melt Rheology and Its Role in Plastics Processing

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Abstract

The essential elements of the film blowing process are illustrated in Figure 17–1. An extruder melts the resin and forces it through a screen pack and an annular die. The extruded melt, in the form of a tube, flows upward under the influence of a vertical, “machine direction” force, applied by means of nip rolls some distance above the die. There is an overall stretching of the polymer in the machine direction, and the ratio of the linear speed of the film through the nip rolls, divided by the average melt velocity at the die lips, is called the “draw down ratio” (DDR).

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Author information

Authors and Affiliations

  1. Department of Chemical Engineering, McGill University, Montreal, Canada

    John M. Dealy

  2. Hoechst Celanese Research Division, Summit, New Jersey, USA

    Kurt F. Wissbrun

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  1. John M. Dealy
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  2. Kurt F. Wissbrun
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© 1990 Van Nostrand Reinhold

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Dealy, J.M., Wissbrun, K.F. (1990). Role of Rheology in Film Blowing and Sheet Extrusion. In: Melt Rheology and Its Role in Plastics Processing. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-9738-4_17

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  • DOI: https://doi.org/10.1007/978-1-4615-9738-4_17

  • Publisher Name: Springer, Boston, MA

  • Print ISBN: 978-1-4615-9740-7

  • Online ISBN: 978-1-4615-9738-4

  • eBook Packages: Springer Book Archive

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