2022
DOI: 10.1021/acsanm.2c02423
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Enzymatically Pretreated High-Solid-Content Nanocellulose for a High-Throughput Coating Process

Abstract: There is an ever-increasing interest toward utilizing nanocellulose as barrier coatings and films, and recent studies have underlined the efficiency of using innovative fibrillation processes such as twin-screw extrusion with an enzymatic pretreatment for producing nanocellulose suspensions with solid contents as high as 20 wt %, which can lead to faster coating speeds and reduced drying energy costs. The current work aims at understanding the factors that influence high-throughput processability of high-solid… Show more

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Cited by 9 publications
(5 citation statements)
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“…that cause adverse environmental impacts and increase the energy cost and carbon footprint. Some emerging bio-based building blocks such as CNFs and CNCs still face challenging commercial-scale processability for coating application and drying processes due to their low solid content and high viscosity profiles; more efforts on the high solid content grade of nanocellulosic materials and their continuous coating application are being implemented to further explore their commercialization potential. , In comparison, our natural, sustainable, waterborne complex dispersion barrier coating exhibits a combination of the highest grease resistance and reduced moisture sensitivity, as well as has the promise of scale-up for industrial production (see description of scalable manufacturing of complex dispersions in the Supporting Information). Moreover, our material selection and one-pot processing pathway align well with green chemistry principles such as use of renewable feedstocks, benign solvents, design for energy efficiency, and design for degradation …”
Section: Resultsmentioning
confidence: 99%
“…that cause adverse environmental impacts and increase the energy cost and carbon footprint. Some emerging bio-based building blocks such as CNFs and CNCs still face challenging commercial-scale processability for coating application and drying processes due to their low solid content and high viscosity profiles; more efforts on the high solid content grade of nanocellulosic materials and their continuous coating application are being implemented to further explore their commercialization potential. , In comparison, our natural, sustainable, waterborne complex dispersion barrier coating exhibits a combination of the highest grease resistance and reduced moisture sensitivity, as well as has the promise of scale-up for industrial production (see description of scalable manufacturing of complex dispersions in the Supporting Information). Moreover, our material selection and one-pot processing pathway align well with green chemistry principles such as use of renewable feedstocks, benign solvents, design for energy efficiency, and design for degradation …”
Section: Resultsmentioning
confidence: 99%
“…The description of rheology measurements and influence of CMC addition on MFC and CNF suspensions' yield stress are given in the supporting information. A more detailed discussion on the role of rheology during continuous coating of nanocellulose can be found in Koppolu et al (2022).…”
Section: Methodsmentioning
confidence: 99%
“…MFC and CNF suspensions were then coated on top of the starch-coated baseboard using the same R2R coater fitted with a slot-die applicator. A detailed description of the working principles of slot-die coating of nanocellulose suspensions is provided in our previous work (Koppolu et al 2018(Koppolu et al , 2019(Koppolu et al , 2022, and is briefly discussed in the supporting information of the current work. Table 1 lists the different nanocellulose coatings done in this work along with their respective wet thicknesses (set value), line speeds, and dry-coating thicknesses (measured value).…”
Section: Suspension Solids Content B (%)mentioning
confidence: 99%
See 1 more Smart Citation
“…Nanocellulose is both bio-based and biodegradable, and therefore, nanocellulose-based coatings and films are being considered as a potential replacement to non-biodegradable plastics and metallic aluminum layers in food packaging applications (Tyagi et al, 2021;Cherian et al, 2022). Several companies have already started producing nanocellulose at pilot or commercial-scale to be used primarily for barrier applications (FutureMarkets, 2021), with many research groups including the authors of this work demonstrating roll-to-roll (R2R) coating of nanocellulose on paper/paperboard using slot-die (Kumar et al, 2016;Koppolu et al, 2018Koppolu et al, , 2019Koppolu et al, , 2022Jung et al, 2022), gravure (Chowdhury et al, 2018), spray coating (Shanmugam, 2022;Satam et al, 2018;Beneventi et al, 2014Beneventi et al, , 2015, and wet lamination (Guerin et al, 2020) methods.…”
Section: Introductionmentioning
confidence: 99%