The Experts below are selected from a list of 6498 Experts worldwide ranked by ideXlab platform
Masayuki Yamaguchi - One of the best experts on this subject based on the ideXlab platform.
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surface improvement on water and oil affinities and absorption rate of pva tung oil coated Paperboard and fiberboard
Journal of Coatings Technology and Research, 2016Co-Authors: Apichaya Jianprasert, Pathavuth Monvisade, Masayuki YamaguchiAbstract:A novel coating material on Paperboard and fiberboard from poly(vinyl alcohol) (PVA) modified with Tung oil was developed. The PVA/Tung oil coating was cured at several conditions: 25, 40, 50, and 60°C, in the presence of two types of catalysts, i.e., thermal catalyst using potassium persulfate (KPS) and redox catalyst using KPS and sodium thiosulfate. The chemical crosslinked structure of PVA/Tung oil-coating films was confirmed by FTIR. The result indicated the decrease in the double bonds of Tung oil by crosslinking reaction, especially at 60°C. In comparison with the same curing temperature, the films with redox catalyst showed more reduction in the number of double bonds of Tung oil. DMA results of the PVA/Tung oil-coating materials with redox catalyst showed the lowering of the heights of both β transition peak of Tung oil and α transition peak of PVA. FTIR and DMA results confirmed the more efficient crosslinking reaction of redox catalytic system than that of the thermal catalytic system. The water resistance and mechanical properties of these coating materials exhibited better values as projected to higher curing temperature and redox catalyst. SEM images showed the smooth surface of PVA/Tung oil covered on the Paperboards with ~72 µm in thickness. The contact angle of water or oil drop and dynamic change in contact angle on the surfaces of PVA/Tung oil-coated Paperboards and fiberboards were investigated. The results show the contact angles for both water and oil were lower than those of the uncoated ones, indicating the improvement of water and oil affinities of the PVA/Tung oil-coating materials. The dynamic changes in contact angle of the coated ones also decreased, suggesting the reduction in water and oil absorption rates of these coated substrates.
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Surface improvement on water and oil affinities and absorption rate of PVA/Tung oil-coated Paperboard and fiberboard
Journal of Coatings Technology and Research, 2016Co-Authors: Apichaya Jianprasert, Pathavuth Monvisade, Masayuki YamaguchiAbstract:A novel coating material on Paperboard and fiberboard from poly(vinyl alcohol) (PVA) modified with Tung oil was developed. The PVA/Tung oil coating was cured at several conditions: 25, 40, 50, and 60°C, in the presence of two types of catalysts, i.e., thermal catalyst using potassium persulfate (KPS) and redox catalyst using KPS and sodium thiosulfate. The chemical crosslinked structure of PVA/Tung oil-coating films was confirmed by FTIR. The result indicated the decrease in the double bonds of Tung oil by crosslinking reaction, especially at 60°C. In comparison with the same curing temperature, the films with redox catalyst showed more reduction in the number of double bonds of Tung oil. DMA results of the PVA/Tung oil-coating materials with redox catalyst showed the lowering of the heights of both β transition peak of Tung oil and α transition peak of PVA. FTIR and DMA results confirmed the more efficient crosslinking reaction of redox catalytic system than that of the thermal catalytic system. The water resistance and mechanical properties of these coating materials exhibited better values as projected to higher curing temperature and redox catalyst. SEM images showed the smooth surface of PVA/Tung oil covered on the Paperboards with ~72 µm in thickness. The contact angle of water or oil drop and dynamic change in contact angle on the surfaces of PVA/Tung oil-coated Paperboards and fiberboards were investigated. The results show the contact angles for both water and oil were lower than those of the uncoated ones, indicating the improvement of water and oil affinities of the PVA/Tung oil-coating materials. The dynamic changes in contact angle of the coated ones also decreased, suggesting the reduction in water and oil absorption rates of these coated substrates.
Koni Grob - One of the best experts on this subject based on the ideXlab platform.
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Taped Barrier Test for Internal Bags Used in Boxes of Recycled Paperboard: The Role of the Paperboard and Its Consequence for the Test
Packaging Technology and Science, 2016Co-Authors: Sandra Biedermann-brem, Maurus Biedermann, Koni GrobAbstract:Internal bags with a functional barrier are a promising solution to render recycled Paperboard acceptable for food packaging. Producers and users of such bags as well as control authorities need a tool to evaluate whether a bag satisfies the requirements of safety. In the previously proposed methods, the criterion focused on the permeability of the barrier layer. This neglected the influence of absorption or adsorption of the substances in the Paperboard and the plastic of the bag. To take these contributions into account, it was proposed to change the criterion and use the percentage of the amount of (surrogate) substances in the recycled Paperboard that passes into the food. This paper explains this, in particular how the method better reflects the reality in a pack of food. Firstly, donors should be prepared from recycled Paperboard, as the behaviour differs from that of paper. Secondly, absorption into the Paperboard seems to be a slow process. It was noted that freshly added surrogate substances were easily extracted by methyl tert-butyl ether, but the extraction yield decreased during storage over some weeks. To catch this reality of the substances in the Paperboard, donors need to be conditioned before use. Finally, absorption in the Paperboard may depend on the concentration, which prompted a further reduction of the amounts of the surrogate substances used for testing. It turned out that usually the hydrocarbon (C17) determines the barrier efficiency; triethyl citrate is no longer used, as it was never a relevant surrogate. Copyright © 2016 John Wiley & Sons, Ltd.
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assurance of safety of recycled Paperboard for food packaging through comprehensive analysis of potential migrants is unrealistic
Journal of Chromatography A, 2013Co-Authors: Maurus Biedermann, Koni GrobAbstract:Abstract A method for determining potentially health-relevant components in Paperboard used for packaging dry foods as comprehensively as technically feasible was applied to a sample of recycled Paperboard. The task was specified by a detection limit in food of 0.01 mg/kg, from which a detection limit of 0.1 mg/kg in Paperboard was derived. Extracts from the Paperboard were preseparated into seven fractions by high performance liquid chromatography (HPLC) and transferred on-line to gas chromatography with flame ionization detection (GC-FID). The chromatograms visualize the high complexity of the material that may migrate into foods at toxicologically potentially relevant concentrations. Since only a minority of the substances was also detectable in fresh fiber board, most must have originated from chemicals used in the paper and board fed into the recycling process. Significant variability between recycled Paperboards of four manufacturers was observed because of varying feedstocks. Using comprehensive two-dimensional GC (GC × GC) with time of flight mass spectrometry (TOF-MS), more than 250 substances were counted that probably exceeded the detection limit and were probably of sufficient volatility for migration into dry food. It is concluded in three main messages to risk managers: (i) since most potential migrants have not been adequately evaluated, many not even identified, the safety required by Article 3 of EU Regulation 1935/2004 has not been ensured; (ii) the number of substances potentially migrating into food above 0.01 mg/kg is too large to realistically be brought under control; (iii) a barrier reducing the migration into food by a factor of 100 over the life time of a product would keep the migration of all except a few well known substances below 0.01 mg/kg in food.
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migration of mineral oil photoinitiators and plasticisers from recycled Paperboard into dry foods a study under controlled conditions
Food Additives and Contaminants Part A-chemistry Analysis Control Exposure & Risk Assessment, 2013Co-Authors: Maurus Biedermann, Janerik Ingenhoff, Michael Zurfluh, Lydia Richter, T J Simat, Antje Harling, Werner Altkofer, Rudiger Helling, Koni GrobAbstract:Migration from recycled Paperboard was monitored after 2, 4 and 9 months of storage for six test foods industrially packed in five configurations, four with internal plastic films. After 9 months, the migration of mineral oil saturated hydrocarbons into foods directly packed in the Paperboard amounted to 30–52 mg/kg, which corresponded to 65%–80% of those of a volatility up to that of the n-alkane C24 in the Paperboard. The concentration of the migrated aromatic hydrocarbons in the foods ranged from 5.5 to 9.4 mg/kg. More than half of this migration occurred in the first 2 months. Differences between the foods amounted to mostly less than a factor of 2 and seemed to be related to porosity or permeability more than fat content. Nine photoinitiators were detected in the Paperboard, of which eight migrated into the packed food at up to 24%. Several plasticisers were present in the recycled Paperboard, but only butyl phthalates showed significant migration. After 9 months, up to 40% of diisobutyl phthalate an...
Monique Lacroix - One of the best experts on this subject based on the ideXlab platform.
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improvement of water barrier property of Paperboard by coating application with biodegradable polymers
Journal of Agricultural and Food Chemistry, 2010Co-Authors: Jaejoon Han, Stephane Salmieri, Canh Le Tien, Monique LacroixAbstract:Biopolymeric coatings were prepared and applied onto Paperboard to improve its water barrier property. To prepare whey protein isolate (WPI)/cellulose-based films, WPI and glycerol were dissolved in water with glutaraldehyde (cross-linking agent) and cellulose xanthate. The solution was cast, dried, and insolubilized by entrapment of WPI in regenerated cellulose. Films were combined with beeswax (BW) into a bilayer coating system and then applied onto Paperboard by heating compression. Another coating solution consisting of poly(vinyl butyral) (PVB)/zein was prepared by dissolving poly(vinyl alcohol) (PVA) and zein in 70% ethanol with glutaraldehyde and butyraldehyde (functionalization agent). The PVB/zein solution was applied onto Paperboard after BW was sprayed. The structure of the PVB/zein-based coatings was analyzed by Fourier transform infrared spectroscopy (FTIR). The water vapor barrier property of coated Paperboards was evaluated by water vapor transmission rate (WVTR) measurements. From the FTIR spectra, PVA functionalization after cross-linking and efficient acetalization into PVB were confirmed. WPI/cellulose and PVB/zein coating treatments improved the water barrier properties of Paperboard by decreasing the WVTR by 77-78%. Although the BW coating was more efficient (decrease of WVTR by 89%), bilayer coatings composed of BW and polymer coatings had a stronger barrier effect with a decrease of WVTR to 92-95%, hence approaching commercial attributes required to ensure water vapor barrier in Paperboard-based food containers (10 g/m(2).day). These results suggest that surface coating by biodegradable polymers may be utilized for the manufacture of Paperboard containers in industrial applications.
Shi Gaofeng - One of the best experts on this subject based on the ideXlab platform.
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preparation method of reinforced slurry addition layer and application of reinforced slurry addition layer to corrugated Paperboard
2018Co-Authors: L I Yuping, Shi GaofengAbstract:The invention discloses a preparation method of a reinforced slurry addition layer and application of the reinforced slurry addition layer to corrugated Paperboard. The preparation method comprises the following steps: using nanometer aluminum oxide and benzenesulfonic acid to prepare a composite nanomaterial in an inert gas atmosphere in a supercritical reactor; preparing into a composite nano-gel through a series of process operations under action of an emulsifier; pulping together with plant starch fiber raw materials to prepare a semi-finished product; and finally, post-processing to obtain a finished reinforced slurry. The reinforced slurry addition layer is mixed with a corrugated Paperboard pulping slurry to prepare the corrugated Paperboard, effectively improves physical strength of the corrugated Paperboard, and has advantages of simple method and high industrialization degree.
Apichaya Jianprasert - One of the best experts on this subject based on the ideXlab platform.
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surface improvement on water and oil affinities and absorption rate of pva tung oil coated Paperboard and fiberboard
Journal of Coatings Technology and Research, 2016Co-Authors: Apichaya Jianprasert, Pathavuth Monvisade, Masayuki YamaguchiAbstract:A novel coating material on Paperboard and fiberboard from poly(vinyl alcohol) (PVA) modified with Tung oil was developed. The PVA/Tung oil coating was cured at several conditions: 25, 40, 50, and 60°C, in the presence of two types of catalysts, i.e., thermal catalyst using potassium persulfate (KPS) and redox catalyst using KPS and sodium thiosulfate. The chemical crosslinked structure of PVA/Tung oil-coating films was confirmed by FTIR. The result indicated the decrease in the double bonds of Tung oil by crosslinking reaction, especially at 60°C. In comparison with the same curing temperature, the films with redox catalyst showed more reduction in the number of double bonds of Tung oil. DMA results of the PVA/Tung oil-coating materials with redox catalyst showed the lowering of the heights of both β transition peak of Tung oil and α transition peak of PVA. FTIR and DMA results confirmed the more efficient crosslinking reaction of redox catalytic system than that of the thermal catalytic system. The water resistance and mechanical properties of these coating materials exhibited better values as projected to higher curing temperature and redox catalyst. SEM images showed the smooth surface of PVA/Tung oil covered on the Paperboards with ~72 µm in thickness. The contact angle of water or oil drop and dynamic change in contact angle on the surfaces of PVA/Tung oil-coated Paperboards and fiberboards were investigated. The results show the contact angles for both water and oil were lower than those of the uncoated ones, indicating the improvement of water and oil affinities of the PVA/Tung oil-coating materials. The dynamic changes in contact angle of the coated ones also decreased, suggesting the reduction in water and oil absorption rates of these coated substrates.
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Surface improvement on water and oil affinities and absorption rate of PVA/Tung oil-coated Paperboard and fiberboard
Journal of Coatings Technology and Research, 2016Co-Authors: Apichaya Jianprasert, Pathavuth Monvisade, Masayuki YamaguchiAbstract:A novel coating material on Paperboard and fiberboard from poly(vinyl alcohol) (PVA) modified with Tung oil was developed. The PVA/Tung oil coating was cured at several conditions: 25, 40, 50, and 60°C, in the presence of two types of catalysts, i.e., thermal catalyst using potassium persulfate (KPS) and redox catalyst using KPS and sodium thiosulfate. The chemical crosslinked structure of PVA/Tung oil-coating films was confirmed by FTIR. The result indicated the decrease in the double bonds of Tung oil by crosslinking reaction, especially at 60°C. In comparison with the same curing temperature, the films with redox catalyst showed more reduction in the number of double bonds of Tung oil. DMA results of the PVA/Tung oil-coating materials with redox catalyst showed the lowering of the heights of both β transition peak of Tung oil and α transition peak of PVA. FTIR and DMA results confirmed the more efficient crosslinking reaction of redox catalytic system than that of the thermal catalytic system. The water resistance and mechanical properties of these coating materials exhibited better values as projected to higher curing temperature and redox catalyst. SEM images showed the smooth surface of PVA/Tung oil covered on the Paperboards with ~72 µm in thickness. The contact angle of water or oil drop and dynamic change in contact angle on the surfaces of PVA/Tung oil-coated Paperboards and fiberboards were investigated. The results show the contact angles for both water and oil were lower than those of the uncoated ones, indicating the improvement of water and oil affinities of the PVA/Tung oil-coating materials. The dynamic changes in contact angle of the coated ones also decreased, suggesting the reduction in water and oil absorption rates of these coated substrates.
