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Blown Film

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Rangrong Yoksan – 1st expert on this subject based on the ideXlab platform

  • Effects of pea protein on properties of cassava starch edible Films produced by BlownFilm extrusion for oil packaging
    Food Packaging and Shelf Life, 2020
    Co-Authors: Kedpraveen Huntrakul, Rangrong Yoksan, Amporn Sane, Nathdanai Harnkarnsujarit

    Abstract:

    Abstract Starch can be commercially prepared into edible and biodegradable packaging via plasticization and extrusion. However, plasticized starch has poor stability in BlownFilm extrusion processability and storage properties which can be improved by combinations with protein. Edible Films were developed from acetylated cassava starch (AS) and pea protein isolate (PI) using conventional BlownFilm extrusion. Films with PI up to 20 % were determined for physical, thermal and barrier properties and stability for oil packaging. PI stabilized Films during Blown-extrusion but decreased flexibility due to strong inter- and intra-molecular interaction with non-homogeneity of AS-PI blend matrices. Protein dispersed in AS matrices at low PI and formed continuous networks at 20 % which led to increased tensile strength. Increase in PI decreased solubility and light transmission but increased protein aggregation and improved crystallinity, surface hydrophobicity and barrier properties against water vapor and oxygen. Increase in PI also reduced glass transition and relaxation temperatures of AS-PI blends. Heat-sealed AS and AS-PI sachets showed effective protection for soybean and olive oil stored for 3 months at different humidities. PI blending effectively prevented humidity-induced shrinkage of AS Film (up to 55 %) and enhanced polymer-glycerol interaction which improved thermal stability. Blending of starch and plant-derived pea protein effectively improved BlownFilm processability and barrier properties for oil-based food products.

  • morphological characteristics and barrier properties of thermoplastic starch chitosan Blown Film
    Carbohydrate Polymers, 2016
    Co-Authors: Khanh Minh Dang, Rangrong Yoksan

    Abstract:

    Abstract Fabrication of starch-based edible Film using Blown Film extrusion is challenging and interesting because this process provides continuous operation with shorter production time and lower energy consumption, is less labor intensive, and results in higher productivity than the conventional solution casting technique. Previously, we reported on the preparation and some properties of thermoplastic starch/chitosan (TPS/CTS) Blown Films; however, their morphological characteristics and barrier properties had not yet been elucidated. The present work thus aims to investigate the effect of chitosan (0.37–1.45%) on morphological characteristics, water vapor and oxygen barrier properties as well as hydrophilicity of the TPS and TPS/CTS Films. The relationship between morphological characteristics and properties of the Films was also discussed. Scanning electron microscopy (SEM), confocal laser scanning microscopy (CLSM) and X-ray photoelectron spectroscopy (XPS) confirmed the distribution and deposition of chitosan on the Film surface. The existence of chitosan on the surface imparted the improved water vapor and oxygen barrier properties and the reduced surface hydrophilicity to the Film. The results suggest that this biodegradable bio-based TPS/CTS Film could potentially be used as an edible Film for food and pharmaceutical applications.

  • Morphological characteristics and barrier properties of thermoplastic starch/chitosan Blown Film
    Carbohydrate Polymers, 2016
    Co-Authors: Khanh Minh Dang, Rangrong Yoksan

    Abstract:

    Fabrication of starch-based edible Film using Blown Film extrusion is challenging and interesting because this process provides continuous operation with shorter production time and lower energy consumption, is less labor intensive, and results in higher productivity than the conventional solution casting technique. Previously, we reported on the preparation and some properties of thermoplastic starch/chitosan (TPS/CTS) Blown Films; however, their morphological characteristics and barrier properties had not yet been elucidated. The present work thus aims to investigate the effect of chitosan (0.37-1.45%) on morphological characteristics, water vapor and oxygen barrier properties as well as hydrophilicity of the TPS and TPS/CTS Films. The relationship between morphological characteristics and properties of the Films was also discussed. Scanning electron microscopy (SEM), confocal laser scanning microscopy (CLSM) and X-ray photoelectron spectroscopy (XPS) confirmed the distribution and deposition of chitosan on the Film surface. The existence of chitosan on the surface imparted the improved water vapor and oxygen barrier properties and the reduced surface hydrophilicity to the Film. The results suggest that this biodegradable bio-based TPS/CTS Film could potentially be used as an edible Film for food and pharmaceutical applications.

Khanh Minh Dang – 2nd expert on this subject based on the ideXlab platform

  • morphological characteristics and barrier properties of thermoplastic starch chitosan Blown Film
    Carbohydrate Polymers, 2016
    Co-Authors: Khanh Minh Dang, Rangrong Yoksan

    Abstract:

    Abstract Fabrication of starch-based edible Film using Blown Film extrusion is challenging and interesting because this process provides continuous operation with shorter production time and lower energy consumption, is less labor intensive, and results in higher productivity than the conventional solution casting technique. Previously, we reported on the preparation and some properties of thermoplastic starch/chitosan (TPS/CTS) Blown Films; however, their morphological characteristics and barrier properties had not yet been elucidated. The present work thus aims to investigate the effect of chitosan (0.37–1.45%) on morphological characteristics, water vapor and oxygen barrier properties as well as hydrophilicity of the TPS and TPS/CTS Films. The relationship between morphological characteristics and properties of the Films was also discussed. Scanning electron microscopy (SEM), confocal laser scanning microscopy (CLSM) and X-ray photoelectron spectroscopy (XPS) confirmed the distribution and deposition of chitosan on the Film surface. The existence of chitosan on the surface imparted the improved water vapor and oxygen barrier properties and the reduced surface hydrophilicity to the Film. The results suggest that this biodegradable bio-based TPS/CTS Film could potentially be used as an edible Film for food and pharmaceutical applications.

  • Morphological characteristics and barrier properties of thermoplastic starch/chitosan Blown Film
    Carbohydrate Polymers, 2016
    Co-Authors: Khanh Minh Dang, Rangrong Yoksan

    Abstract:

    Fabrication of starch-based edible Film using Blown Film extrusion is challenging and interesting because this process provides continuous operation with shorter production time and lower energy consumption, is less labor intensive, and results in higher productivity than the conventional solution casting technique. Previously, we reported on the preparation and some properties of thermoplastic starch/chitosan (TPS/CTS) Blown Films; however, their morphological characteristics and barrier properties had not yet been elucidated. The present work thus aims to investigate the effect of chitosan (0.37-1.45%) on morphological characteristics, water vapor and oxygen barrier properties as well as hydrophilicity of the TPS and TPS/CTS Films. The relationship between morphological characteristics and properties of the Films was also discussed. Scanning electron microscopy (SEM), confocal laser scanning microscopy (CLSM) and X-ray photoelectron spectroscopy (XPS) confirmed the distribution and deposition of chitosan on the Film surface. The existence of chitosan on the surface imparted the improved water vapor and oxygen barrier properties and the reduced surface hydrophilicity to the Film. The results suggest that this biodegradable bio-based TPS/CTS Film could potentially be used as an edible Film for food and pharmaceutical applications.

  • Development of thermoplastic starch Blown Film by incorporating plasticized chitosan
    Carbohydrate Polymers, 2015
    Co-Authors: Khanh Minh Dang, Rangrong Yoksan

    Abstract:

    The objective of the present work was to improve Blown Film extrusion processability and properties of thermoplastic starch (TPS) Film by incorporating plasticized chitosan, with a content of 0.37-1.45%. The effects of chitosan on extrusion processability and melt flow ability of TPS, as well as that on appearance, optical properties, thermal properties, viscoelastic properties and tensile properties of the Films were investigated. The possible interactions between chitosan and starch molecules were evaluated by FTIR and XRD techniques. Chitosan and starch molecules could interact via hydrogen bonds, as confirmed from the blue shift of OH bands and the reduction of V-type crystal formation. Although the incorporation of chitosan caused decreased extensibility and melt flow ability, as well as increased yellowness and opacity, the Films possessed better extrusion processability, increased tensile strength, rigidity, thermal stability and UV absorption, as well as reduced water absorption and surface stickiness. The obtained TPS/chitosan-based Films offer real potential application in the food industry, e.g. as edible Films.

Richard D. Braatz – 3rd expert on this subject based on the ideXlab platform

  • instabilities and multiplicities in non isothermal Blown Film extrusion including the effects of crystallization
    Journal of Process Control, 2011
    Co-Authors: Carl J Pirkle, Richard D. Braatz

    Abstract:

    Abstract Stable operating regions for Blown Film extrusion are mapped using a dynamic model that includes the effect of crystallization on the rheological properties of the polymer. In the computations, the bubble air mass and take-up ratio were held constant, and the machine tension and bubble inflation pressure were treated as dependent variables. For a given bubble air mass, the take-up ratio was used as the continuation parameter for mapping steady-state solutions. The take-up ratio varies smoothly, but not necessarily monotonically, with the machine tension. Curves of either blow-up ratio or thickness reduction versus take-up ratio reveal that there are take-up ratios where no, one, or multiple solutions exist. The heat transfer coefficient from the polymer Film to the external air and surroundings has a marked influence on the qualitative and quantitative features of the blow-up ratio versus thickness reduction curves. Generalized eigenvalue analysis of the linearized Blown Film equations indicates that increasing the heat transfer rate increases the stability of operations. A corresponding decline occurs, however, in the thickness reduction of the Blown Film for a given blow-up ratio.

  • a thin shell two phase microstructural model for Blown Film extrusion
    Journal of Rheology, 2010
    Co-Authors: J C Pirkle, Richard D. Braatz

    Abstract:

    A two-phase microstructural constitutive relation is combined with the thin-shell model for the simulation of Blown Film extrusion. This combination includes equations for momentum conservation, flow-enhanced crystallization, viscoelasticity, and bubble-tube cooling. Consistent with typical Blown Film operation, the simulations set the bubble air mass and take-up ratio as constants, while treating the machine tension and inflation pressure as dependent variables. In all the simulations performed, the high degree of crystallization, and subsequent system stiffening, located the freeze-line naturally. Bubble geometry, temperature, and crystallinity were fitted to experimental data using material and kinetic parameters mostly obtained by a simpler quasi-cylindrical model. The thin-shell microstructural model was compared to a modified quasi-cylindrical model. The models predict similar responses to operational changes, including axial locked-in stresses at the freeze-line, but have significant differences in the locked-in stresses in the transverse direction, which were attributable to the use of different momentum equations. Either model can be used for data fitting, parameter estimation, and prediction of most process responses to upsets.A two-phase microstructural constitutive relation is combined with the thin-shell model for the simulation of Blown Film extrusion. This combination includes equations for momentum conservation, flow-enhanced crystallization, viscoelasticity, and bubble-tube cooling. Consistent with typical Blown Film operation, the simulations set the bubble air mass and take-up ratio as constants, while treating the machine tension and inflation pressure as dependent variables. In all the simulations performed, the high degree of crystallization, and subsequent system stiffening, located the freeze-line naturally. Bubble geometry, temperature, and crystallinity were fitted to experimental data using material and kinetic parameters mostly obtained by a simpler quasi-cylindrical model. The thin-shell microstructural model was compared to a modified quasi-cylindrical model. The models predict similar responses to operational changes, including axial locked-in stresses at the freeze-line, but have significant differences in…

  • Maximum-Likelihood Parameter Estimation for the Thin-Shell Quasi-Newtonian Model for a Laboratory Blown Film Extruder
    Industrial & Engineering Chemistry Research, 2010
    Co-Authors: J C Pirkle, Mitsuko Fujiwara, Richard D. Braatz

    Abstract:

    While most plastic Films are manufactured by Blown Film extrusion, their first-principles modeling has remained substantially more challenging than for most other chemical engineering unit operations due to its combination of heat transfer, crystallization, and non-Newtonian fluid mechanics. This paper applies maximum-likelihood parameter estimation to characterize the convective heat transfer characteristics from measured spatial radii and temperature profiles for a laboratory-scale Blown Film process extruding a linear low density polyethylene (LLDPE) polymer. The Pearson and Petrie thin-Film extrusion model incorporates (i) a quasi-Newtonian constitutive relation for the effect of temperature and crystallization on the viscosity of the polymer and (ii) a spatial variation of the heat transfer coefficient that is qualitatively consistent with turbulent flow simulations reported in the literature. A single heat transfer expression fit the experimental conditions for a cooling air flow rate of 1.5 m/s, wh…