Specific Mechanical Energy Requirement of a Locally Developed Extruder for Selected Starchy Crops

Fayose, Folasayo; Huan, Zhongjie

doi:10.3136/fstr.20.793

Cited by 2 publications

(1 citation statement)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When processing a polymer system that does not undergo chemical reactions and/or significant morphology changes, SME is expected to increase with increasing screw speed, and decreasing temperature or throughput [ 55 ]. It can be calculated from [ 56 ]:

where

is the screw speed (rpm), To is the corrected torque (N.m), i.e., the ratio of the real torque during operation and the permissible torque, and

is the feed rate (kg/h).…”

Section: Resultsmentioning

confidence: 99%

On-Line Optical Monitoring of the Mixing Performance in Co-Rotating Twin-Screw Extruders

2022

View full text Add to dashboard Cite

The use of real-time techniques to evaluate the global mixing performance of co-rotating twin-screw extruders is well consolidated, but much less is reported on the specific contribution of individual screw zones. This work uses on-line flow turbidity and birefringence to ascertain the mixing performance of kneading blocks with different geometries. For this purpose, one of the barrel segments of the extruder was modified in order to incorporate four sampling devices and slit dies containing optical windows were attached to them. The experiments consisted in reaching steady extrusion and then adding a small amount of tracer. Upon opening each sampling device, material was laterally detoured from the local screw channel, and its turbidity and birefringence were measured by the optical detector. Residence time distribution curves (RTD) were obtained at various axial positions along three different kneading blocks and under a range of screw speeds. It is hypothesized that K, a parameter related to the area under each RTD curve, is a good indicator of dispersive mixing, whereas variance can be used to assess distributive mixing. The experimental data confirmed that these mixing indices are sensitive to changes in processing conditions, and that they translate the expected behavior of each kneading block geometry.

show abstract

where

is the screw speed (rpm), To is the corrected torque (N.m), i.e., the ratio of the real torque during operation and the permissible torque, and

is the feed rate (kg/h).…”

Section: Resultsmentioning

confidence: 99%