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Elongational flows film blowing

La Mantia, F. R, R. Scaffaro, G. Carianni, and P. Mariani. 2005. Rheological properties of different film blowing polyethylene samples under shear and elongational flow. Macromolecular Materials and Engineering 290 159-164. [Pg.258]

In industrial processes such as injection molding, extrusion, fiber spinning, or film blowing, a polymer is subjected to a flow, shear, elongation, or mixed deformation modes. The crystallization occurs either during the flow... [Pg.228]

The deformation of molten polyethylene may take place in either constrained or nnconstrained systems. The former is exemplified by flow in a channel, such as that encountered in an extmder or an injection molding die. The latter involves elongation of the melt without the benefit of walls to constrain its shape, typified by film blowing or the drawing of an extrudate to form a fiber. Flow in a eonstrained system involves shear deformation whenever the polymer adheres to the walls. When adhesion to the wall fails, slip/stick or plug flow oeeurs, neither of which is desirable in the ordinary eourse of polyethylene pro-... [Pg.258]

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See also in sourсe #XX -- [ Pg.838 , Pg.839 , Pg.840 ]



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