Effect of filler additions on pilot-scale extrusion coating of paperboard with PLA-based blends

2022 ◽  
Vol 0 (0) ◽  
Author(s):  
Karoliina Helanto ◽  
Riku Talja ◽  
Sai Li ◽  
Orlando J. Rojas
Keyword(s):  
Thermal Imaging ◽  
Mechanical Performance ◽  
Pilot Scale ◽  
Screw Extruder ◽  
Gas Barrier ◽  
Mineral Particles ◽  
Extrusion Coating ◽  
Twin Screw ◽  
Mineral Fillers ◽  
Coating Weight

Abstract We study the incorporation of minerals (talc, kaolin and surface-treated calcium carbonate) in paperboard coatings based on PLA to improve their performance, often limited by the low crystallinity and moderate gas barrier of the polymer. Masterbatches of PLA-based blends mixed with the mineral fillers were melt-blended in a twin-screw extruder and applied as a coating on paperboard in a pilot-scale unit operating at velocities up to 140 m/min. Thermal imaging was used during the extrusion coating and the effect of the fillers was investigated as far as processability and their effect on the mechanical performance. A reduction of neck-in and improved adhesion between the coating and the substrate were achieved at intermediate mineral loadings. Excess filler and low coating weight generated pinholes, leading to a reduction of the integrity and mechanical properties of the coatings. Overall, we define the performance window for continuous, pilot-scale coating of paperboard with a biopolyester filled with mineral particles, opening the opportunity to realize operations in industrial settings.

scholarly journals Effects of a Twin-Screw Extruder Equipped with a Molten Resin Reservoir on the Mechanical Properties and Microstructure of Recycled Waste Plastic Polyethylene Pellet Moldings

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1058
Author(s):  
Hikaru Okubo ◽  
Haruka Kaneyasu ◽  
Tetsuya Kimura ◽  
Patchiya Phanthong ◽  
Shigeru Yao
Keyword(s):  
Mechanical Properties ◽  
Mechanical Performance ◽  
Value Added ◽  
Industrial Applications ◽  
Twin Screw Extruder ◽  
Screw Extruder ◽  
Polymer Properties ◽  
Wide Range ◽  
Twin Screw ◽  
Recycled Plastics

Each year, increasing amounts of plastic waste are generated, causing environmental pollution and resource loss. Recycling is a solution, but recycled plastics often have inferior mechanical properties to virgin plastics. However, studies have shown that holding polymers in the melt state before extrusion can restore the mechanical properties; thus, we propose a twin-screw extruder with a molten resin reservoir (MSR), a cavity between the screw zone and twin-screw extruder discharge, which retains molten polymer after mixing in the twin-screw zone, thus influencing the polymer properties. Re-extruded recycled polyethylene (RPE) pellets were produced, and the tensile properties and microstructure of virgin polyethylene (PE), unextruded RPE, and re-extruded RPE moldings prepared with and without the MSR were evaluated. Crucially, the elongation at break of the MSR-extruded RPE molding was seven times higher than that of the original RPE molding, and the Young’s modulus of the MSR-extruded RPE molding was comparable to that of the virgin PE molding. Both the MSR-extruded RPE and virgin PE moldings contained similar striped lamellae. Thus, MSR re-extrusion improved the mechanical performance of recycled polymers by optimizing the microstructure. The use of MSRs will facilitate the reuse of waste plastics as value-added materials having a wide range of industrial applications.

Study of a novel co-rotating non-twin screw extruder in processing flame retardant polymer materials

2017 ◽  
Vol 37 (8) ◽  
pp. 827-835
Author(s):  
Song Zhao ◽  
Baiping Xu ◽  
Liang He ◽  
Huiwen Yu ◽  
Shouzai Tan
Keyword(s):  
Flame Retardant ◽  
Mechanical Performance ◽  
Acrylonitrile Butadiene Styrene ◽  
Operating Conditions ◽  
Polymer Materials ◽  
Twin Screw Extruder ◽  
Screw Extruder ◽  
Limiting Oxygen Index ◽  
Twin Screw ◽  
Halogen Free

Abstract A thorough study was carried out to investigate the priority of a novel co-rotating non-twin screw extruder (NTSE) over a traditional twin screw extruder (TSE) in the mixing process of halogen-free intumescent flame-retardant acrylonitrile-butadiene-styrene (ABS) composites. The homogeneity of the flame-retardant additives of the composites processed by NTSE and TSE under the same operating conditions was characterized by using mechanical performance properties, limiting oxygen index values, UL-94 tests, and thermogravimetric analysis. All the results suggested that NTSE could achieve better mixing of the flame-retardant additives in the polymer matrix than TSE, which was further clarified by the scanning electron microscope pictures.

Characterization of Mechanical and Thermal Properties of PP/Mineral Composites

2014 ◽  
Vol 1025-1026 ◽  
pp. 241-245 ◽  
Author(s):  
Ľudmila Dulebová ◽  
Emil Spišák ◽  
Branislav Duleba ◽  
František Greškovič ◽  
Tomasz Garbacz
Keyword(s):  
Mechanical Properties ◽  
Thermal Analysis ◽  
Mechanical And Thermal Properties ◽  
Screw Extruder ◽  
Twin Screw ◽  
Pp Composites ◽  
Mineral Fillers ◽  
The Impact ◽  
Properties Of Composites

The paper presents the impact of the use of fillers on the mechanical properties of composites with polymeric matrix from polypropylene (PP). Two main types of mineral fillers - talc and calcium carbonate - were used for experiments. PP composites of different percentage filler in matrix PP were compounded with twin-screw extruder and then injection molding. Properties of composites were investigated by tensile test and thermal analysis. Tensile strength was performed to determine and compare the mechanical properties of the unfilled PP and filled PP with various percentages of fillers. Thermal analysis by thermogravimetric was performed on the tested materials - weight loss, glass transition temperature, thermal decomposition, melting temperature.

Co-Continuous PPS/PA66 Composites - Part II: Mechanical Performance

2013 ◽  
Vol 804 ◽  
pp. 102-105
Author(s):  
Tao Yin ◽  
Yu Qi Gu ◽  
Chun Yu Yu ◽  
Zi Xin Li
Keyword(s):  
Mechanical Properties ◽  
Phase Structure ◽  
Mechanical Performance ◽  
Mechanical Analysis ◽  
Continuous Phase ◽  
Polyamide 66 ◽  
Screw Extruder ◽  
Wide Range ◽  
Twin Screw

Poly (phenylene sulfide) (PPS) was blended with polyamide 66 (PA66) in a wide range of compositions by using a co-rotating twin-screw extruder. Dynamic mechanical analysis was used in determination of the co-continuous phase. The results allowed to precisely detecting the range of co-continuity. In addition, the mechanical properties of PPS/PA66 composites can also be used to identify the dispersed/matrix phase or co-continuous phase structure.

Processing Science of Isotactic Polypropylene Fiber Reinforced with Halloysite Nanotubes Based on Masterbatch Dilution Technique

2013 ◽  
Vol 677 ◽  
pp. 16-19
Author(s):  
Yang Lu ◽  
Andre Lee ◽  
Xiu Fang Wen ◽  
Pi Hui Pi ◽  
Jiang Cheng ◽  
...  
Keyword(s):  
Isotactic Polypropylene ◽  
Mechanical Performance ◽  
Polypropylene Fiber ◽  
Halloysite Nanotubes ◽  
Degree Of Crystallinity ◽  
Air Cooling ◽  
Horizontal Distance ◽  
Dilution Technique ◽  
Screw Extruder ◽  
Twin Screw

The properties of nanocomposites can be improved significantly by the addition of nanoparticles into polymer. Nanocomposites of isotactic polypropylene (iPP) and Halloysite Nanotubes (HNT) at 100/0 and 99.2/0.8 weight ratios were prepared in a co-rotating twin screw extruder using masterbatch dilution technique. IPP/HNT fibers were obtained in a single-screw extruder with extrusion temperature of 231°C, screw speed of 1.38 rpm and 0.6mm diameter die L/D of 6. The effect of processing variables, such as pick-up speed (0.05m/s, 0.15m/s and 0.45m/s), horizontal distance (0, 0.5m and 1m),and annealing (120°C), were investigated. The air cooling time was crucial for fiber processing and exhibited a linkage with crystal morphology, degree of crystallinity as well as the mechanical performance of the fiber. More importantly, the incorporation of HNT into isotactic polypropylene reduced the deficiencies of the annealing process on the toughness and elongation at break of the pure polypropylene fibers, and significantly enhanced the tensile strength of the fiber.

Polyethylene-Clay Nanocomposites Using Ionomeric Compatibilizer

2006 ◽  
Vol 45 ◽  
pp. 1399-1404 ◽  
Author(s):  
Saul Sánchez-Valdés ◽  
M.L. López-Quintanilla
Keyword(s):  
Mechanical Performance ◽  
Clay Nanocomposites ◽  
Melt Blending ◽  
Linear Low Density Polyethylene ◽  
Mixing Conditions ◽  
Screw Extruder ◽  
Chemically Modified ◽  
Different Types ◽  
Twin Screw ◽  
One Step

Nanocomposites made of linear low-density polyethylene (LLDPE) and two different types of clays were obtained and studied by using zinc neutralized carboxylate ionomer as a compatibilizer. Two different clays, natural montmorillonite (Closite Na+) and a chemically modified clay Closite 20A has been used. Nanocomposites were prepared by melt blending in a twin-screw extruder using two mixing methods: two-step mixing and one-step mixing. The relative influence of each compatibilizer was observed from structural analysis by WAXD, and mechanical properties. Experimental results confirms that the film samples with ionomer showed good mechanical performance and that the two step mixing conditions resulted in a better dispersion and intercalation for the nanofillers than one step mixing.

Effects of Compatibilizers on Properties of Polypropylene/Bamboo Fiber Composites

2017 ◽  
Vol 728 ◽  
pp. 301-306 ◽  
Author(s):  
Jitlada Boonlertsamut ◽  
Rutchaneekorn Wongpajan ◽  
Supaphorn Thumsorn ◽  
Hiroyuki Hamada
Keyword(s):  
Mechanical Performance ◽  
Fiber Composites ◽  
Bamboo Fiber ◽  
Injection Molding Process ◽  
Screw Extruder ◽  
Molding Process ◽  
Thermoplastic Material ◽  
Twin Screw ◽  
And Storage ◽  
Enhanced Crystallinity

Bamboo fiber (BF) reinforced thermoplastic material composites were prepared in this study. polypropylene (PP) was compounded with bamboo fiber in a twin screw extruder at bamboo fiber contents of 0-30 wt% with polyethylene grafted maleic anhydride (PE-g-MA) as modifying agent. PP/bamboo fiber composites were to dumbbell specimens by injection molding process. The effect of bamboo fiber contents on properties of the composites was investigated. Tensile and storage modulus of the composites increased when increasing bamboo fiber contents. It can be noted that bamboo fiber promoted crystallization and enhanced crystallinity of PP in the composites, which improved the composites mechanical performance. On the contrary, tensile strength of the PP/BF composites was almost unchanged. Nevertheless, it was considering that the level of interaction between bamboo fiber and PP could be enhanced at higher contents of PE-g-MA. It can be noted that fracture toughness of the PP/BF composites was maintained at the BF contents of 10 wt%, which was attributed to the good interaction between bamboo fiber and PP matrix with the addition of PE-g-MA.

The Effects of Melt Compounding Method on the Ambient and In Vitro Mechanical Properties of EVA/MMT Nanocomposites

2015 ◽  
Vol 789-790 ◽  
pp. 75-79 ◽  
Author(s):  
Azlin Fazlina Osman ◽  
Tew Wei Hong ◽  
Abdulkader M. Alakrach
Keyword(s):  
Mechanical Properties ◽  
Mechanical Performance ◽  
Twin Screw Extruder ◽  
Screw Extruder ◽  
Melt Compounding ◽  
Twin Screw ◽  
Internal Mixer ◽  
Nanofiller Content ◽  
Eva Copolymer

The in vitro biostability of ethyl vinyl acetate (EVA) nanocomposite incorporating the organically modified montmorillonite (organo-MMT) was investgated as a new material for biomedical applications. The effects of compounding process and filler loadings on the ambient and in vitro (exposed in oxidizing condition, 37°C) mechanical properties were studied. We have observed that, the melt compounded EVA copolymer by internal mixer (Brabender plasticoder) achieved the highest ambient and in vitro mechanical properties at low nanofiller content (1wt% organo-MMT). In contrast, the melt compounded EVA copolymer by twin screw extruder achieved the highest ambient and in vitro mechanical properties at high nanofiller content (5wt% organo-MMT). We suggest that this was due to the capability of the twin screw extruder to provide greater shear force for the exfoliation and dispersion of the high content organo-MMT as compared to internal mixer (Brabender plasticoder). However, compounding by twin screw extruder caused more severe reduction in tensile toughness of the EVA containing 5 wt% organo-MMT, after this material was exposed to oxidative agent, 37°C. These studies show that the melt compounding method may bring significant effect to both the ambient and in vitro mechanical performance of the EVA nanocomposites, and hence further investigation towards optimization should be pursued.

Extraction of Essential Oil from Waste Grapefruit Peel Using a Pilot-Scale Twin-Screw Extruder

2021 ◽  
Author(s):  
Lázaro Gabriel Trujillo-Juárez ◽  
Óscar Hernández-Meléndez ◽  
Miquel Gimeno ◽  
Jesús Gracia-Fadrique ◽  
Eduardo Bárzana
Keyword(s):  
Essential Oil ◽  
Pilot Scale ◽  
Twin Screw Extruder ◽  
Screw Extruder ◽  
Twin Screw ◽  
Grapefruit Peel
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