On-line optical monitoring of the mixing performance in co-rotating twin-screw extruders

F Bernardo, JA Covas, SV Canevarolo - Polymers, 2022 - mdpi.com
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 …

In-line near-infrared spectroscopy for measuring the composition, compositional fluctuation and mixedness of polymer blends in a twin screw extruder

TT Li, LF Feng, XP Gu, R Hreiz, CL Zhang… - Chemical Engineering …, 2024 - Elsevier
Polymer blending is often conducted in the molten state using a twin screw extruder
because the atom efficiency can reach nearly 100%. One of the challenges it faces is that …

In situ dielectric characterization of dynamic orientation for polymer molecular chains

G Shen, Y Zhang, Y Wang, W Yu, Z Huang, M Li… - Sensors and Actuators B …, 2020 - Elsevier
Polymer orientation is a fundamental and key issue, exhibiting crucial impacts on physical
properties of polymeric parts. Current methods are limited in transparent materials and fail to …

[HTML][HTML] In-line monitoring flow in an extruder die by rheo-optics

J Silva, AC Santos, SV Canevarolo - Polymer Testing, 2015 - Elsevier
A new modular slit die with optical windows in two different positions and three pressure
transducers flush-mounted along the wall was built and coupled to the exit of a twin-screw …

A Small‐Scale Experimental Extrusion Set‐Up for Exploring Relationships Between Process‐Induced Structures and Characteristics of Multiphase Polymer Systems

PF Teixeira, JM Maia, JA Covas… - Macromolecular …, 2015 - Wiley Online Library
Taking immiscible polymer blends of polystyrene (PS)/poly (methyl methacrylate)(PMMA) as
a case study, we present the capabilities of a small‐scale experimental extrusion set‐up for …

In‐process measurements for reactive extrusion monitoring and control

JA Covas - Reactive Extrusion: Principles and Applications, 2017 - Wiley Online Library
Process monitoring of reactive extrusion is often limited to pressure and temperature
measurements at the die. These may be sensitive to fluctuations in the process, but provide …

Form birefringence and turbidity of polystyrene/poly (methyl methacrylate) blends in slit dies and planar contractions

J Silva, SV Canevarolo - Journal of Applied Polymer Science, 2016 - Wiley Online Library
The birefringence and turbidity of a polystyrene/poly (methyl methacrylate)(PMMA) blend,
with the concentration of the PMMA dispersed phase ranging up to 1%, were measured in …

Real-time thermo-optical analysis of polymer samples by quantitative polarized optical microscopy

LA Bicalho, JMJ da Silva, JA Covas… - Journal of Thermal …, 2017 - Springer
An experimental setup using a polarized optical microscope fitted with a detection module
capable of measuring the cross-polarized transmitted light intensity and the transmitted light …

Caracterização óptica on-line das misturas dispersiva e distributiva na extrusão dupla rosca

FOC Bernardo - 2022 - repositorio.ufscar.br
Neste trabalho, o efeito de distintos elementos de malaxagem nos níveis de mistura
dispersiva e distributiva de uma mistura diluída PS/PA6 ao longo do perfil de rosca de uma …

Detector óptico NIR in-line para monitoramento da degradação termomecânica do polipropileno durante a extrusão

A Tibola - 2022 - repositorio.ufscar.br
RESUMO A presente pesquisa teve como objetivo o desenvolvimento de um detector óptico
NIR (infravermelho próximo) in-line para monitoramento da degradação termomecânica do …