scholarly journals Effects of a Chitosan Coating Layer on the Surface Properties and Barrier Properties of Kraft Paper

BioResources ◽  
2016 ◽  
Vol 11 (1) ◽  
Author(s):  
Shanhui Wang ◽  
Yi Jing
Keyword(s):  
Surface Properties ◽  
Coating Layer ◽  
Barrier Properties ◽  
Chitosan Coating ◽  
Kraft Paper

scholarly journals Potential of Cellulose Microfibers for PHA and PLA Biopolymers Reinforcement

Molecules ◽  
2020 ◽  
Vol 25 (20) ◽  
pp. 4653
Author(s):  
Gonzalo Mármol ◽  
Christian Gauss ◽  
Raul Fangueiro
Keyword(s):  
Lignin Content ◽  
Barrier Properties ◽  
Production Costs ◽  
Recycled Paper ◽  
High Fiber ◽  
Kraft Paper ◽  
Layer Composite ◽  
Mechanical And Physical Properties ◽  
Cellulose Microfibers ◽  
Current Production

Cellulose nanocrystals (CNC) have attracted the attention of many engineering fields and offered excellent mechanical and physical properties as polymer reinforcement. However, their application in composite products with high material demand is complex due to the current production costs. This work explores the use of cellulose microfibers (MF) obtained by a straightforward water dispersion of kraft paper to reinforce polyhydroxyalkanoate (PHA) and polylactic acid (PLA) films. To assess the influence of this type of filler material on the properties of biopolymers, films were cast and reinforced at different scales, with both CNC and MF separately, to compare their effectiveness. Regarding mechanical properties, CNC has a better reinforcing effect on the tensile strength of PLA samples, though up to 20 wt.% of MF may also lead to stronger PLA films. Moreover, PHA films reinforced with MF are 23% stronger than neat PHA samples. This gain in strength is accompanied by an increment of the stiffness of the material. Additionally, the addition of MF leads to an increase in the crystallinity of PHA that can be controlled by heat treatment followed by quenching. This change in the crystallinity of PHA affects the hygroscopicity of PHA samples, allowing the modification of the water barrier properties according to the required features. The addition of MF to both types of polymers also increases the surface roughness of the films, which may contribute to obtaining better interlaminar bonding in multi-layer composite applications. Due to the partial lignin content in MF from kraft paper, samples reinforced with MF present a UV blocking effect. Therefore, MF from kraft paper may be explored as a way to introduce high fiber concentrations (up to 20 wt.%) from other sources of recycled paper into biocomposite manufacturing with economic and technical benefits.

Influence of Processing Factors on the Surface Properties of Zirconia Coatings Fabricated by Room Temperature Spray Process

2020 ◽  
Vol 20 (7) ◽  
pp. 4152-4157
Author(s):  
Jeong Jun Kim ◽  
Jong Kook Lee
Keyword(s):  
Surface Roughness ◽  
Particle Size ◽  
Surface Properties ◽  
Room Temperature ◽  
Coating Layer ◽  
High Surface ◽  
Phase Changes ◽  
Deposition Cycle ◽  
Implant Surface ◽  
Processing Factors

Highly roughened surfaces on dental implants enhance the bone-bonding ability and in vivo cell adhesion on the implant surface. In this study, zirconia substrates were coated by powder coating using room temperature spray processing to improve their surface properties. Processing factors (particle size of the starting powder, number of repetitions of the deposition cycle, and spraying distance) were controlled to form a dense coating layer with high surface roughness on the zirconia substrate. Starting zirconia powders for coating were heat-treated at high temperature to control the particle size and kinetic energy. The coating layer fabricated from starting powder with a particle size of about 1.52 μm shows a homogeneous and dense microstructure, and it has a maximum surface roughness about 0.37 μm. The surface roughness of the film coatings increased with the number of times that the deposition cycle was repeated. No phase changes between the starting powder and the coating layer were observed, and all of the materials show identical tetragonal phases.

Study on Coating Surface Topography and Properties of Coated Paper Related to Pigment

2012 ◽  
Vol 466-467 ◽  
pp. 504-507
Author(s):  
Ying Li ◽  
Bei Hai He
Keyword(s):  
Surface Topography ◽  
Surface Properties ◽  
Coating Layer ◽  
Layer Structure ◽  
Chemical Properties ◽  
Physical Structure ◽  
Coated Paper ◽  
Paper Surface ◽  
Coating Surface ◽  
Printing Ink

The physical structure and chemical properties of coating layer have an important influence on transferring and setting of the printing ink. In this study, the effect of pigment on coating layer structure and surface properties was investigated. The surface topography was explored using scanning electron microscopy (SEM) and atomic force microscopy (AFM). The findings indicated that the pigment affected the pore size, depth and distribution of the coated paper surface. The conclusions were drawn that coating could improve coating surface topography and calcium carbonate pigment compared with kaolin pigment was not good to the paper surface properties, which resulted in high roughness, low paper gloss, high ink absorption and low paper surface efficiency.

scholarly journals Manufacturing of Food Packaging Based on Nanocellulose: Current Advances and Challenges

Nanomaterials ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1726
Author(s):  
Ghislain Fotie ◽  
Sara Limbo ◽  
Luciano Piergiovanni
Keyword(s):  
High Performance ◽  
Food Packaging ◽  
Coating Layer ◽  
Scale Up ◽  
Barrier Properties ◽  
Synthetic Polymers ◽  
Layer By Layer ◽  
Gas Barrier ◽  
Industrial Manufacturing ◽  
Made In

Nowadays, environmental pollution due to synthetic polymers represents one of the biggest worldwide challenges. As demonstrated in numerous scientific articles, plant-based nanocellulose (NC) is a biodegradable and nontoxic material whose mechanical, rheological, and gas barrier properties are competitive compared to those of oil-based plastics. However, the sensitivity of NC in humid ambient and lack of thermosealability have proven to be a major obstacle that hinders its breakthrough in various sectors including food packaging. In recent years, attempts have been made in order to provide a hydrophobic character to NC through chemical modifications. In addition, extensive works on nanocellulose applications in food packaging such as coating, layer-by-layer, casting, and electrospinning have been reported. Despite these enormous advances, it can easily be observed that packaging manufacturers have not yet shown a particular interest in terms of applicability and processability of the nanocellulose due to the lack of guidelines and guarantee on the success of their implementation. This review is useful for researchers and packaging manufacturers because it puts emphasis on recent works that have dealt with the nanocellulose applications and focuses on the best strategies to be adopted for swift and sustainable industrial manufacturing scale-up of high-performance bio-based/compostable packaging in replacement of the oil-based counterparts used today.

Dye adsorption and bactericidal properties of TiO2/chitosan coating layer

2016 ◽  
Vol 148 ◽  
pp. 153-160 ◽  
Author(s):  
Tahseen Kamal ◽  
Yasir Anwar ◽  
Sher Bahadar Khan ◽  
Muhammad Tariq Saeed Chani ◽  
Abdullah M. Asiri
Keyword(s):  
Coating Layer ◽  
Dye Adsorption ◽  
Chitosan Coating ◽  
Bactericidal Properties

Adsorption and photocatalyst assisted dye removal and bactericidal performance of ZnO/chitosan coating layer

2015 ◽  
Vol 81 ◽  
pp. 584-590 ◽  
Author(s):  
Tahseen Kamal ◽  
Mazhar Ul-Islam ◽  
Sher Bahadar Khan ◽  
Abdullah M. Asiri
Keyword(s):  
Dye Removal ◽  
Coating Layer ◽  
Chitosan Coating

scholarly journals MICROCRYSTALLINE CELLULOSE REINFORCED CHITOSAN COATING ON KRAFT PAPER

2020 ◽  
Vol 54 (1-2) ◽  
pp. 95-102 ◽  
Author(s):  
TAWHIDA AKTER ◽  
◽  
JANNATUN NAYEEM ◽  
ARIFUL HAI QUADERY ◽  
M. ABDUR RAZZAQ ◽  
...  
Keyword(s):  
Microcrystalline Cellulose ◽  
Chitosan Coating ◽  
Kraft Paper

Barrier properties created by dispersion coating

TAPPI Journal ◽  
2013 ◽  
Vol 12 (4) ◽  
pp. 45-51 ◽  
Author(s):  
ROGER BOLLSTRÖM ◽  
ROGER NYQVIST ◽  
JANET PRESTON ◽  
PEKKA SALMINEN ◽  
MARTTI TOIVAKKA
Keyword(s):  
Water Vapor ◽  
Organic Solvent ◽  
Focused Ion Beam ◽  
Coating Layer ◽  
Layer Structure ◽  
Ion Beam ◽  
Cost Savings ◽  
Barrier Properties ◽  
Particle Orientation ◽  
Coating Materials

The objective of this work was to gain insight into 1) how a coating layer with barrier properties is built up, 2) how different polymer dispersions and pigments function as a barrier against gases and fluids, and 3) how the thickness and evenness of the coating layer affect barrier properties. In addition to tests for permeability of water vapor, barrier properties required for functional applications (i.e., against solvents and acids) were studied. Permeability of an organic solvent (ortho-dichlorobenzene) and hydrochloric acid was studied as a function of barrier layer structure. Providing a barrier to these materials is important in the processing of printing functionality on paper. Pigment particle orientation and tortuosity were examined by infrared spectroscopy and by high-resolution, focused ion beam milling and imaging. The barrier properties were influenced by the thickness and evenness of the coating layer and the mass ratio between the pigment and latex. A barrier against water vapor did not always ensure a barrier against the organic solvent or the acid. In addition to barrier properties, the choice of coating materials affects coatability and may provide possibilities for cost savings.

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