scholarly journals Chitosan/Montmorillonite Coatings for the Fabrication of Food-Safe Greaseproof Paper

Polymers ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1607
Author(s):  
Kaipeng Wang ◽  
Lihong Zhao ◽  
Beihai He
Keyword(s):  
Chitosan Solution ◽  
Air Permeability ◽  
Mixed Solution ◽  
Machine Direction ◽  
Coated Paper ◽  
Cellulosic Fibers ◽  
Chitosan Coating ◽  
Coated Papers ◽  
Uncoated Paper ◽  
Tearing Resistance

Here, we report a non-toxic method for improving the oil-resistant performance of chitosan coated paper by coating the mixture of chitosan and montmorillonite (MMT) instead of coating chitosan solution only. Through combining MMT into the chitosan coatings, the coated paper exhibited a lower air permeability and enhanced oil resistance under a lower coating load. For coated papers C2.5 and C3 by coating 2.5% (w/v) and 3% (w/v) chitosan without adding MMT in the chitosan coating, the coating load was 3.76 g/m2 and 3.99 g/m2, respectively, and the kit rating values were only 7–8/12. Regarding the sample C2M0.1 coated by the mixed solution containing 2% (w/v) chitosan and 0.1% (w/v) MMT, its coating load was only 3.65 g/m2, the paper permeability after coating was reduced to 0.00507 μm/Pa·s, owing to the filling of MMT into the cellulosic fibers network, and the kit rating reached 9/12. Moreover, C2M0.1 showed improved mechanical properties, whereby its tearing resistance was 5.2% and 6.6% higher than that of the uncoated paper in the machine direction and the cross direction, respectively.

scholarly journals Application of Polyvinyl Acetate/Lignin Copolymer as Bio-Based Coating Material and Its Effects on Paper Properties

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 192
Author(s):  
Nana Zhang ◽  
Pansheng Liu ◽  
Yanbin Yi ◽  
Magdi E. Gibril ◽  
Shoujuan Wang ◽  
...  
Keyword(s):  
Vinyl Acetate ◽  
Air Permeability ◽  
Coated Paper ◽  
Water Contact ◽  
Paper Properties ◽  
Lignin Fraction ◽  
Uncoated Paper ◽  
And Performance ◽  
Packaging Paper ◽  
Acetate Copolymer

In this work, lignin-vinyl acetate copolymers containing different fractions of lignin were synthesized by the copolymerization technique. The synthesized copolymer was successfully applied to coat the paper for enhancing its properties and performance. The effects of the lignin-vinyl acetate copolymer on the physicochemical, air permeability and mechanical properties of paper were investigated. The mechanical strength, hydrophilic, and air permeability properties of coated paper were improved with the increasing content of the lignin. Lignin-vinyl acetate copolymer containing 15% lignin coated paper exhibited a 1.86 times increase in the tensile index, 45 times increase in the water contact angle, and a 41.1% reduction in the air permeability compared with uncoated paper. Scanning electron microscopy was applied to study the morphology of the coated and uncoated paper. The results showed that paper surface porosity structure was decreased, while the surface smoothness was enhanced considerably with increasing lignin fraction in the copolymer. Therefore, the successful fabrication of such an enchanting coated paper may afford new potential and great applications in the packaging paper.

Cracking at the fold in double layer coated paper: the influence of latex and starch composition

TAPPI Journal ◽  
2019 ◽  
Vol 18 (2) ◽  
pp. 93-99
Author(s):  
SEYYED MOHAMMAD HASHEMI NAJAFI ◽  
DOUGLAS BOUSFIELD, ◽  
MEHDI TAJVIDI
Keyword(s):  
Mechanical Properties ◽  
Double Layer ◽  
Starch Content ◽  
Single Layer ◽  
Double Layers ◽  
Coated Paper ◽  
Coated Papers ◽  
Coating Layers ◽  
Scanned Images ◽  
Packaging Paper

Cracking at the fold of publication and packaging paper grades is a serious problem that can lead to rejection of product. Recent work has revealed some basic mechanisms and the influence of various parameters on the extent of crack area, but no studies are reported using coating layers with known mechanical properties, especially for double-coated systems. In this study, coating layers with different and known mechanical properties were used to characterize crack formation during folding. The coating formulations were applied on two different basis weight papers, and the coated papers were folded. The binder systems in these formulations were different combinations of a styrene-butadiene latex and mixtures of latex and starch for two different pigment volume concentrations (PVC). Both types of papers were coated with single and double layers. The folded area was scanned with a high-resolution scanner while the samples were kept at their folded angle. The scanned images were analyzed within a constant area. The crack areas were reported for different types of papers, binder system and PVC values. As PVC, starch content, and paper basis weight increased, the crack area increased. Double layer coated papers with high PVC and high starch content at the top layer had more cracks in comparison with a single layer coated paper, but when the PVC of the top layer was low, cracking area decreased. No measurable cracking was observed when the top layer was formulated with a 100% latex layer.

scholarly journals Effects of Chitosan Coating Structure and Changes during Storage on Their Egg Preservation Performance

Coatings ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 317 ◽  
Author(s):  
Dan Xu ◽  
Jing Wang ◽  
Dan Ren ◽  
Xiyu Wu
Keyword(s):  
Weight Loss ◽  
Acetic Acid ◽  
Fourier Transform ◽  
Acetic Acid Solution ◽  
Chitosan Solution ◽  
Coating Structure ◽  
Chitosan Coating ◽  
Structure Changes ◽  
Coating Layers ◽  
Haugh Unit

To explore the influences of chitosan coating structure and structure changes during storage on egg preservation, eggs coated by chitosan solution for single time (CS1), two times (CS2), and three times (CS3) were prepared separately and stored with untreated eggs (CK1), eggs washed by water (CK2) and eggs treated by acetic acid solution (CK3) at 25 °C, 80% RH. The weight loss, Haugh unit, yolk index, albumen pH, eggshell morphologies and infrared (FTIR—Fourier Transform Infrared) spectra of all the samples were monitored. CS2 and CS3 presented the lowest weight loss, highest Haugh unit and yolk index, stabilized pH, and the highest thickness of chitosan coating layers (>2 μm) among all the groups, which extended egg shelf life for 20 days longer compared to CK1 and CK2. CS1 with very thin chitosan coating showed similar egg qualities with CK3, which are second only to CS2 and CS3. Furthermore, destructions were found on chitosan coatings during storage as revealed by the eggshell morphologies and FTIR spectra, which caused the quality deterioration of eggs. The results demonstrated that eggs with the thickest coating showed the best qualities during storage, while destructions on coating layers led to the quality drop of eggs.

Fractal Analysis of Coated Papers

2012 ◽  
Vol 730-732 ◽  
pp. 209-214
Author(s):  
J. Velho ◽  
N.F. Santos
Keyword(s):  
Fractal Dimension ◽  
Calcium Carbonate ◽  
Fractal Analysis ◽  
Coated Paper ◽  
Precipitated Calcium Carbonate ◽  
Coated Papers ◽  
Coating Colour ◽  
Ground Calcium Carbonate

The main goal of this research is to apply AFM to the analysis of coated paper topography in order to find out relationships between sheet gloss and some parameters obtained from AFM, such as roughness and fractal dimension (D). Flooding technique was also developed using appropriated software. Number of hills/flooding volume for 25%, 50% and 75% flooded volume was applied in this research. Ground calcium carbonate and precipitated calcium carbonate were applied in coating colour formulations, alone and blended in three formulations, 75:25, 50:50 and 25:75. The results obtained showed high correlations between sheet gloss with fractal dimension (D) parameter. Finally, flooding technique showed to be very interesting, all of them gave useful information in interpreting the influence of topography on sheet gloss.

scholarly journals THE EFFECT OF CHITOSAN COATING ON COLOR AND BRIX OF RED GRAPES (Vitis vinivera) IN STORAGE

2020 ◽  
Vol 9 (4) ◽  
pp. 361
Author(s):  
Andra Tersiana Wati ◽  
Elok Pawening Maharani
Keyword(s):  
Storage Time ◽  
Chitosan Solution ◽  
Statistical Test ◽  
Edible Coating ◽  
Agricultural Product ◽  
Red Grapes ◽  
Post Harvest ◽  
Chitosan Coating ◽  
Chitosan Concentration ◽  
And Storage

Fruits are a type of perishable agricultural product. One of the post-harvest handling efforts to maintain the freshness of the fruit is chitosan coating. Research has been carried out on various level concentration of chitosan as a coating for grapes (Vitis vinifera) and storage time. This study aims to determine the effect of chitosan concentration on water content,  color and brix of red grapes after storage. Chitosan coating was carried out by immersion methods at various levels of chitosan concentration, namely 0%, 0.5%, 1%, 1.5% and 2% (w/v) with immersion times of 30 seconds and 60 seconds. Based on the statistical test, it is shown that the chitosan concentration of 1.5% (w/v) with immersion time of 60 seconds and storage time on the 5th day is the most optimum for the brightness level of the grapes because the chitosan layer can close the pores of red grapes so that the respiration process aerobic and CO2 which affect color can be inhibited by chitosan solution. Keywords: Chitosan, edible coating, grape, post harvest, shelf life

scholarly journals OPTICAL DENSITY OF YELLOW PRINTS AT COATED AND UNCOATED PAPER

2020 ◽  
Vol 7 (2) ◽  
pp. 9-13
Author(s):  
Gema Sukmawati Suryadi ◽  
Susiani Susiani ◽  
Mawan Nugraha ◽  
Balqis Azhar Ulfah Alifah ◽  
Meuthia Suryani
Keyword(s):  
Layer Thickness ◽  
Optical Density ◽  
Print Quality ◽  
Coated Paper ◽  
Optimal Density ◽  
Density Values ◽  
Print Materials ◽  
Uncoated Paper ◽  
Thickness Variations ◽  
Printing Ink

Optical Density is one of the important parameters used to control print quality. Optical density in print materials is form of interaction of ink with paper. This research is oriented to the investigation of optical density value of Yellow printing ink on coated and uncoated paper. The main purpose of this study is to analyze the effect of printing ink thickness on optimal density value. The optical density value of yellow prints obtained using densitometer measurement, printed using IGT method on coated and uncoated paper. Ink thickness variations are applied (0.8 - 9.6 μm). Density values was found to increase as the ink layer thickness increased to a certain point called the optimal density (2.4 μm ink thickness on coated paper and 4.5 μm on uncoated paper). Optical density of yellow printing ink on coated paper is higher uncoated paper, which relates to porosity on paper

scholarly journals Chitosan Solution Containing Zein and Essential Oil as Bio Based Coating on Packaging Paper

Coatings ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 497 ◽  
Author(s):  
Urška Vrabič Brodnjak ◽  
Katarina Tihole
Keyword(s):  
Essential Oil ◽  
Chemical Properties ◽  
Chitosan Solution ◽  
Barrier Properties ◽  
Layer By Layer ◽  
Food Sector ◽  
Coating Solution ◽  
Coated Papers ◽  
Rosemary Oil ◽  
Packaging Paper

Modifications of the packaging paper surface play an important role in a variety of industries, especially in the food sector. Uncoated paper has poor water and oil barrier properties due to its porous structure. In this study, packaging paper was successfully coated with six different coating solutions containing combinations of chitosan, zein and rosemary essential oil. The chitosan and zein were actually coated in two layers; the mixed chitosan–rosemary oil and the mixed zein–rosemary oil were each applied as one layer to the paper. The results showed increased oil barrier properties in the papers coated with mixed zein–rosemary oil and reduced water permeability in the papers coated with the chitosan–rosemary oil coating solution. The result of this two-layer coating showed excellent water (Cobb60 value of 2.18 g/m2) and oil barrier properties. All the coated papers showed a high thermal stability, especially those coated with chitosan, zein and rosemary oil layer by layer. Scanning electron microscopy was used to verify the surface differences of the coated papers, such as the closed structure, pores and smoother surface, especially in the layer-wise coated samples. Due to their good mechanical and chemical properties, coated papers with rosemary oil can be used in many applications, possibly also in the field of repellents.

Influence of Heat-Stretching Treatment on Structure and Properties of Bico MB Nonwoven Webs

2004 ◽  
Vol os-13 (1) ◽  
pp. 1558925004os-13
Author(s):  
Dong Zhang ◽  
Christine (Qin) Sun ◽  
Yanbo Liu
Keyword(s):  
Tensile Strength ◽  
Air Permeability ◽  
Bending Stiffness ◽  
Structure And Properties ◽  
Machine Direction ◽  
Fiber Splitting ◽  
Web Structure ◽  
Treatment Changes ◽  
The Web

Heat stretching treatment (HST) to side-by-side bicomponent meltblown webs has been carried out on the Stretch Consolidation Pilot Line at the UTK-TANDEC Demonstration Laboratory, to examine the influence of HST on the web structure and properties. The results showed that the fibers aligned preferentially along machine direction after the treatment. Changes in the web structure and properties were studied, including basis weight, thickness, air permeability, tensile strength, bending stiffness, as well as extension recovery (%) from the strain of 50% elongation-to-break, etc. No fiber splitting was observed, which indicated that HST did not result in fiber splitting in the bicomponent meltblown webs as desired.

Selenium Nanoparticles Inhibit Various Bacterial Growth on Paper Towels

2014 ◽  
Vol 1626 ◽  
Author(s):  
Qi Wang ◽  
Thomas J. Webster
Keyword(s):  
Bacterial Infections ◽  
Antibacterial Properties ◽  
Selenium Nanoparticles ◽  
Coated Paper ◽  
Selenium Nanoparticle ◽  
Wide Range ◽  
Clinical Environments ◽  
Uncoated Paper ◽  
Paper Towels

ABSTRACTBacterial infections are commonly found on paper towels and other paper products leading to the potential spread of bacteria and consequent health concerns. The objective of this in vitro study was to introduce antibacterial properties to paper towel surfaces by coating them with selenium nanoparticles. Results showed that the selenium nanoparticle coated paper towels inhibited the growth of S. Aureus and P. aeruginosa by 80%∼90% after 72 hours compared with the uncoated paper towels. Thus, the study showed that nano-selenium coated paper towels may lead to an increased eradication of bacteria to more effectively clean a wide-range of clinical environments, thus, improving health.

Quality and Shelf Life of Mango (Mangifera Indica L. cv. `Tainong') Coated by Using Chitosan and Polyphenols

2007 ◽  
Vol 13 (4) ◽  
pp. 317-322 ◽  
Author(s):  
J. Wang ◽  
B. Wang ◽  
W. Jiang ◽  
Y. Zhao
Keyword(s):  
Shelf Life ◽  
Sensory Quality ◽  
Mangifera Indica ◽  
Titratable Acidity ◽  
Chitosan Solution ◽  
Life Extension ◽  
Mango Fruit ◽  
Chitosan Coating ◽  
Keeping Quality

Chitosan-based coatings were used to delay ripening and prolong shelf-life of mango fruit stored at 15±1°C and 85—90% RH for 35 days. Mango fruits were treated with 2% chitosan solution or with 2% chitosan containing 1% tea polyphenols (TP—chitosan). Samples were taken at regular intervals for analysis. Results indicated that chitosan coating alone could decrease the decay incidence and weight loss, and delay the change in colour, pH and titratable acidity of mango fruit during storage. While coating the fruit with TP—chitosan was more effective at keeping quality of the fruit during storage. Firmness of the control fruit declined rapidly to 18.6 N after 5 days of storage at 15°C, which was 22.8% or 71.5% lower than that of the fruit treated with chitosan or TP—chitosan, respectively. Sensory quality of mango was enhanced significantly by the TP—chitosan coating compared with chitosan coating alone. These results suggested that treatment with chitosan containing TP exhibited high potential for shelf-life extension of mango fruit.

Sign in / Sign up

Export Citation Format

Share Document