Rheological and heat transfer aspects of the melt spinning of monofilament fibers of polyethylene and polystyrene

Acierno, Domenico; Dalton, J. Nelson; Rodriguez, J. M.; White, James L.

doi:10.1002/app.1971.070151007

Cited by 59 publications

(12 citation statements)

References 40 publications

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“…If 7, is 2?, then it may be taken from Table I to be about 0.02 sec. This leads to an apparent Deborah number24*56p57 for the process N D e b = Trn/tres (20) of 0.03, which is small. However, the value of 7, may be too small, and the variation in dvldx along the spinline makes it questionable whether such a choice oft,,, which gives a global Deborah number is appropriate.…”

Section: Viscoelastic Fluid Theorymentioning

confidence: 94%

Melt‐spinning dynamics and rheological properties of nylon 6

Bankar¹,

Spruiell²,

White³

1977

J of Applied Polymer Sci

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SynopsisBasic studies of the melt-spinning dynamics and rheological properties of a nylon 6 polymer are described. The magnitude of the force components on the spinline has been analyzed with special reference to the drag and rheological forces. Spinline deformation has been investigated for spinning through ambient air and through an isothermal chamber. Both sets of experiments are interpreted using an elongational viscosity. Non-Newtonian viscosity was measured at 230°, 250°, and 270% in a Weissenberg rheogoniometer and an Instron capillary rheometer. The principal normal stress difference was measured in the former instrument. The rheological properties are interpreted in terms of the theory of viscoelastic fluid behavior. The isothermal melt-spinning experiments were also interpreted in terms of the theory of viscoelastic fluids, and attempts were made to understand the spinning results in terms of basic rheological properties.

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Section: Viscoelastic Fluid Theorymentioning

confidence: 94%

Melt‐spinning dynamics and rheological properties of nylon 6

Bankar¹,

Spruiell²,

White³

1977

J of Applied Polymer Sci

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“…One can then define the ratio of these as the apparent (transient) elongational viscosity, qapp (see for example: Nitschmann and Schrade 1948, Ziabicki and Kedzierska 1960a, 1960b, Ziabicki 1961, Fehn 1968, Ghibashi et al 1970, Acierno et al 1971, Han and Lamonte 1972, Spearot and Metzner 1972, Acierno et al 1974. It is worth noting that the shear viscosity of the fluids involved is still relatively high (> 50 N s m-2) and the loads required to produce elongation correspondingly large.…”

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confidence: 99%

The Fluctuon States of Electrons in Disordered Systems

Krivoglaz¹

1972

Sov. Phys. Usp.

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The measurement of the elongational viscosity of polymer solutions and melts has become of major importance in contemporary rheology. This paper describes a new viscometer which is capable of measuring the extremely small loads required to elongate filaments of polymer solutions of low concentration. The data obtained from this instrument are used to evaluate the apparent elongational viscosities of several solutions, and the results are correlated in terms of the strains imposed.

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“…This value was obtained by Acierno etal. [17] from melt spinning measurements for polyethylene. As we will see later from the resulting cooling effect this value is too large for the present extrusion problem, which is clearly due to the fact that the motion involved in the extrusion experiments is much slower than that in the melt spinning process and the same heat transfer coefficient will cause excessive cooling to the extrudate.…”

Section: Resultsmentioning

confidence: 99%

A pseudo-time integral method for non-isothermal viscoelastic flows and its application to extrusion simulation

Luo

Tanner

1987

Rheol Acta

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A pseudo-time integral scheme based on a finite streamline element method is developed to combine variable temperature with viscoelasticity. A specific KBKZ integral model for isothermal flow is transformed to its non-isothermal version by introducing a pseudo-time and applying the Morland-Lee hypothesis. The coupling between momentum and energy equations is through the time-temperature shifting factor by which the pseudo-time is defined. The observer time and the pseudo-time are simultaneously calculated when tracing the strain history for the stress calculation in a non-homogeneous temperature field. Using this scheme, a full non-isothermal numerical simulation of some IUPAC extrusion experiments is carried out. Results show that while the temperature distribution near the die exit plane is an important factor controlling extrudate swell, either self-heating inside the die tube or external cooling on the free surface dominantly determines the temperature distribution near the die exit when the wall temperature is kept constant, depending on whether the Ptclet number is large or small. The hot layer effect predicted by the inelastic swell mechanism is confirmed and well illustrated by the computation. Calculations with reasonable thermal boundary conditions further convince us that the isothermal assumption in our earlier numerical simulation is a good approximation in this particular case.

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Rheological and heat transfer aspects of the melt spinning of monofilament fibers of polyethylene and polystyrene

Cited by 59 publications

References 40 publications

Melt‐spinning dynamics and rheological properties of nylon 6

Melt‐spinning dynamics and rheological properties of nylon 6

The Fluctuon States of Electrons in Disordered Systems

A pseudo-time integral method for non-isothermal viscoelastic flows and its application to extrusion simulation

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