Fundamentals of plasticating extrusion. II. Experiments

Marshall, D. I.; Klein, Imrich

doi:10.1002/pen.760060304

Cited by 22 publications

(11 citation statements)

References 1 publication

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“…Polymer Processing XXVI (2011) 2 Further investigations based on screw freezing experiments of various polymers mostly confirmed the Maddock's melting mechanism (Cox et al, 1981;Gale, 1970;Kacir and Tadmor, 1972;Kulas and Thorshaug, 1979;Marshall et al, 1964;Marshall and Klein, 1966;Martin, 1969;Mennig, 1981;Street, 1961;Tadmor et al, 1967;Tadmor and Klein, 1969). However, some exceptions to the mechanism have been reported (Campbell et al, 2003;Dekker, 1976;Klenk, 1968;Menges and Klenk, 1967).…”

mentioning

confidence: 79%

Melting in a Single Screw Extruder: Experiments and 3D Finite Element Simulations

Altınkaynak

Gupta

Spalding

et al. 2011

International Polymer Processing

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The melting of an ABS resin was simulated using a three-dimensional finite element simulation of the two-phase flow in the compression section of a single-screw extruder. Screw freezing experiments were also conducted to compare the numerical predictions with the corresponding experimental data. Numerical simulations as well as experiments exhibited the Maddock melting mechanism and numerical predictions were in good agreement with the corresponding experimental data. The sensitivity of the melting profile to various material properties and processing conditions was numerically analyzed. With a constant flow rate enforced at the entrance of the screw channel, the screw and barrel temperature were found to have a minor effect on the melting profile. However, these parameters were found to have a significant effect on the predicted pressure profile along the screw channel. When the zero-traction boundary condition was imposed at the entrance of the screw channel, a change in the screw or barrel temperature affected the flow rate in the screw channel, which resulted in a significant change in the solid fraction at the same cross-section.

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confidence: 79%

Melting in a Single Screw Extruder: Experiments and 3D Finite Element Simulations

Altınkaynak

Gupta

Spalding

et al. 2011

International Polymer Processing

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“…Several years later, Tadmor et al [60][61][62] completed a similar experimentation and developed the first melting model for single screw extrusion, which was a crucial contribution to the theory of extrusion and allowed us to formulate the first computer extrusion model EXTRUD [63]. This fundamental melting model was built by determining the velocity and temperature profiles in the melt film and temperature profile in the solid bed ( Figure 2).…”

Section: Melting Sectionmentioning

confidence: 99%

Fundamentals of Global Modeling for Polymer Extrusion

et al. 2019

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A review paper is presented on modeling for polymer extrusion for both single screw and twin-screw extrusion. An issue of global modeling is discussed, which includes modeling for solid conveying, melting, melt flow, and co-operation of the screw/die system. The classical approach to global modeling of the extrusion process, which is based on separate models for each section of the screw, i.e., solid transport section, melting and pre-melting sections, and the melt flow section is presented. In this case, the global model consists of the elementary models. A novel continuous concept of global modeling based on CFD (Computational Fluids Dynamics) computations is also presented, and a concept of using the DEM (Discrete Element Method) computation coupled with CFD computations is discussed.

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“…Numerous experiments were performed in various size extruders with several polymers, such as low and high density polyethy- lene, rigid and plasticized polyvinyl chloride, polypropylene, nylon and ABS. In these experiments the postulated melting mechanism was tested, the temperature, pressure and temperature fluctuations in the extruder (6,7,8,9,10) were measured at various axial locations. Thermocouples planted in the screw were used to measure the temperature of the polymer and sensitive pressure transducers in the barrel were used to measure the pressure.…”

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confidence: 99%

The simulation of the plasticating screw extrusion process with a computer programmed theoretical model

Klein¹,

Tadmor²

1969

Polymer Engineering & Sci

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A fundamental mathematical model of the plasticating extruder was assembled by combining a previously reported melting model with an improved melt pumping model. The validity of the model was tested with numerous experiments on 2 1/2 in. and 8 in. diameter extruders. The experiments were performed with low and high density polyethylene, plasticized polyvinyl chloride, rigid polyvinyl chloride powder, polypropylene, ABS and nylon 66. The mathematical model proved to be excellent in predicting pressure and plastic temperature profiles in the extruder channel, temperature fluctuation, solids content, and power consumption.

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Fundamentals of plasticating extrusion. II. Experiments

Cited by 22 publications

References 1 publication

Melting in a Single Screw Extruder: Experiments and 3D Finite Element Simulations

Melting in a Single Screw Extruder: Experiments and 3D Finite Element Simulations

Fundamentals of Global Modeling for Polymer Extrusion

The simulation of the plasticating screw extrusion process with a computer programmed theoretical model

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