Flow behavior and exit pressures of corn meal under high‐shear–high‐temperature extrusion conditions using a slit die<sup>a)</sup>

Padmanabhan, Mahesh; Bhattacharya, Mrinal

doi:10.1122/1.550217

Cited by 60 publications

(32 citation statements)

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“…To calculate the volumetric flow rate, Q, the density of the melt was assumed to be 1.4 g/cm 3 . Similar values have been reported for the density of starch based materials (1.2-1.5 g/cm 3 [245,247,252,261]). Within this range, the sensitivity of the calculated model parameters to density values is negligable.…”

Section: Analysis Of Datasupporting

confidence: 73%

“…The short residence times in the extruder keep any significant thermal degradation from occurring, and therefore degradation will substantially be the result of mechanical shear effects. The actual mechanisms of degradation will in fact be a combination of shear, moisture and temperature effects [245]. Such degradation leads not only to changes in molecular weight and molecular weight distribution, but also structural changes of the molecules.…”

Section: The Effects Of Mechanical Shearmentioning

confidence: 99%

“…These include capillary and slit die work [222,231,[245][246][247][248][249][250][251][252][253]. was also adapted by Chen et al [91] to model soy dough extrusion rheology, and by…”

Section: Modelling Rheological Properties Of Starch Extrudatesmentioning

confidence: 99%

“…It was not possible to probe the melt temperature along the die. However, Padmanabhan and Bhattacharya [245] theoretically calculated the temperature rises expected for corn meal extruded through a slit die and concluded that any such rises would be insignificant in changing n, compared to the effects of molecular degradation.…”

mentioning

confidence: 99%

“…could be considered as representative of an energy level required for the significant changes in starch molecular structure [245] that are observed in Figure 6.18. The corresponding shear stresses at these transitions could also be regarded as characteristic molecular yield stresses of the thermoplastic starch samples.…”

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confidence: 99%

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A conceptual model of a sustainable system based upon observations of biodegradable plastic packaging film experiments and material flow

Fletcher¹

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One can imagine full knowledge of a system allows for optimal decision making when problems arising within that system need to be solved. In reality, solutions involving any non-trivial system must be pursued with incomplete knowledge. In light of the complexity and diversity of current industrial economic systems and the decision-making processes pertaining to them, integrating streams of knowledge would improve problem solving outcomes on such scales. More specifically, it could potentially address how to compare the rate of problem proliferation to solution implementation within a system. However, successfully integrating knowledge of diverse systems towards a common purpose requires careful and consistent analogies to be constructed between the entities of those systems. The current work investigates the merits of such an approach for resolving sustainable development issues. The hypothesis is that knowledge of what influences the flow and transformation of matter, (that is, what influences a common phenomenon throughout life-supporting systems), can facilitate this integration. The problem of accumulating material waste is used as a vehicle to focus the discussion.To this end, the foundation of the work is an experimental study into the development of a starch based biodegradable plastic packaging film. The two main constraints on sample production were to minimise cost and maximise biodegradability. Slit die rheological data is gathered for five samples selected from polymer extrusion trials as part of describing their viscous behaviours via a semi-empirical model incorporating die temperature (measured at 120, 140 and 160°C) and shear rate (altered by screw speeds of 5-50 rpm).The samples differ in additive content and extrusion passes from a baseline starch/water/glycerol (~73/18/9.0 wt% total) combination extruded once to the addition of cross-linking agents and surface modifiers (<1 wt% total) extruded twice. GPC, DSC, tensile strength and moisture absorption analyses join the rheological data to explain The experimental study represents a typical analytical approach to developing a technical solution. Yet while technology will remain indispensable to problem solving, there is a iii need to realise that splintering knowledge into disciplines of the ever finer detail required to extend technical accomplishment, must also be complemented by a synthesis of associated facts and relevant theories to address more encompassing problems associated with sustainability of the modern industrial economy. Therefore, considering the relative success of modelling the viscous behaviour of the starch based plastic samples, it was proposed to extend the concepts of rheology used to explain the flow of matter on the molecular scale to the flow of matter on the scale of the industrial economy.To whatever extent possible, the advantages of being able to predict how such flows respond to industrial economic decisions would contribute to the research of sustainable systems.The assumption is made here that an apt mate...

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Section: Analysis Of Datasupporting

confidence: 73%

Section: The Effects Of Mechanical Shearmentioning

confidence: 99%

“…These include capillary and slit die work [222,231,[245][246][247][248][249][250][251][252][253]. was also adapted by Chen et al [91] to model soy dough extrusion rheology, and by…”

Section: Modelling Rheological Properties Of Starch Extrudatesmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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A conceptual model of a sustainable system based upon observations of biodegradable plastic packaging film experiments and material flow

Fletcher¹

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Development of an in-line viscometer in an extrusion molding process

Chiu¹,

Yiu²,

Pong³

1997

J. Appl. Polym. Sci.

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ABSTRACT:In this work, an in-line viscometer to measure the viscosity of polymer melts under extrusion molding processes was developed. The in-line viscometer contains a stress sensor and a shear rate sensor which were installed between the screw and the die of an extruder. In this way, the flow line after the screw cannot be changed, unlike the present in-line capillary rheometer which can change the diameter of the pipe of the flow line and hence influence the throughput. All data acquisition is done by a computer such that the melt viscosity can be calculated automatically. The shearthinning behavior of a low-density polyethylene (LDPE) under three different temperatures is presented in all experiments. It is concluded that the melt viscosity can be effectively monitored.

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The Generic Extrusion Process II

Bouvier¹,

Campanella

2014

Extrusion Processing Technology

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Flow behavior and exit pressures of corn meal under high‐shear–high‐temperature extrusion conditions using a slit die^a)

Cited by 60 publications

References 0 publications

A conceptual model of a sustainable system based upon observations of biodegradable plastic packaging film experiments and material flow

A conceptual model of a sustainable system based upon observations of biodegradable plastic packaging film experiments and material flow

Development of an in-line viscometer in an extrusion molding process

The Generic Extrusion Process II

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Flow behavior and exit pressures of corn meal under high‐shear–high‐temperature extrusion conditions using a slit diea)

Cited by 60 publications

References 0 publications

A conceptual model of a sustainable system based upon observations of biodegradable plastic packaging film experiments and material flow

A conceptual model of a sustainable system based upon observations of biodegradable plastic packaging film experiments and material flow

Development of an in-line viscometer in an extrusion molding process

The Generic Extrusion Process II

Contact Info

Product

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Flow behavior and exit pressures of corn meal under high‐shear–high‐temperature extrusion conditions using a slit die^a)