Search

This project investigated the use of facile pulping methods to produce pulp from mixed bio-plantation waste fibres using sodium hydroxide, ethanol and garbage enzyme. Papers were successfully made from mixture of corn husk fibres with other bio-based green fibres such as banana stems and pineapple leaves. Soda pulping was found to be efficient in converting the cellulosic bio-fibres to the pulps used for paper making. The papers produced have low tensile strength, high water absorption, high bio-decomposition and degradation rate, as compared to commercial papers. SEM observation revealed that paper made from mixed bio-fibres have lightly cross-linked structures compared to heavily cross-linked or compact network structures found in commercial papers. The paper can be used in applications that require high water absorbency. The paper making process is more environmental friendly as it reduces the usage of wood fibres and hence reduces the environmental problem caused by deforestation.

Environmental awareness and depletion of the wood resources are among vital factors that motivate various researchers to explore the potential of agro-based crops as an alternative source of fiber material in paper industries such as writing, printing, wrapping, and packaging. Fibers from agro-based crops are available in abundance, low cost, and most importantly its biodegradability features, which sometimes referred as “ecofriendly” materials. This paper reports the biopulping of pineapple leaf fiber (PALF) by Ceriporiopsis subvermispora towards the properties of its fiber and paper forms. The individual fibers were characterized having good tensile properties at 0.3% of fungus treatment and favourable structural properties as characterized by Fourier transform infra-red (FTIR) spectroscopy. It was also shown that the PALF paper achieved desirable tear index value and uniform morphological observations compared to the conventional chemical pulping method. This new approach of pulping PALF finds applications in paper and packaging products which requires biofriendly characteristic and cost effective.

Homemade water in water cationic polyacrylamide (CPAM) emulsion was applied in cigarette paper pulp as dry strengthening agent with other strengthening agent. Good collaborative effect was achieved when CPAM was used in bleached wheat straw pulp with strengthening agent E and with cationic additives L as paper pulp strengthening agent. It was also showed that distinct strengthening effect was obtained when CPAM emulsion was applied in mixture of bleached needle kraft pulp (NBKP) and wheat straw pulp, breaking length and tearing index of cigarette handsheet made of mix pulp was respectively increased by 22.2% and17.0% when the dosage of CPAM was 0.8% of dry fiber. Through analysis of cigarette handsheet section scanning electron microscopy (SEM) photos, strengthening mechanism of CPAM emulsion to cigarette paper pulp was preliminary studied.

Paper acidification has become a serious problem in the world and deacidification is an effective way to extend the life of the paper documents. This essay introduced the acidification of the paper documents and the regular methods of deacidification at present. It surveyed the deacidification technologies in Europe and America countries and the progress of decacidification research programs in China, and then proposed the opinions on R&D and promotion of paper document acidification technology in China.

Super absorbent polymer (SAP) and fluff pulp were used as absorbing materials, and the different SAP mass ratio and fluff pulp were applied to paper diaper absorption core layer. Then, the influence of different SAP/fluff pulp in composite core layer on the paper diapers normal saline absorption rate and topsheet run-off were studied. Results showed that SAP has a significant effect on normal saline absorbency respect to fluff pulp. When the normal saline volume increased, the paper diapers absorption rate about normal saline decreased, while the topsheet run-off increased. When the SAP mass ratio to fluff pulp was 0.5:0.5, the liquid absorbency rate was 35.23 g/g, the paper diaper average absorption rate was 3.96 mL/s, and the biggest topsheet run-off was 13.25 g.

The aim of this research was to produce three-layer Medium Density Particleboard (MDP), with the addition of impregnated paper, in the inner layer, in proportions of 1; 5 and 20%. In this study, MDP was composed with particles of small size in outer layers, and larger particles in internal layer. After panel manufacturing, physical and mechanical tests based on Brazilian Code ABNT NBR 14.810 were carried out to determine moisture content; density; thickness swelling; water absorption; modulus of rupture (MOR) and modulus of elasticity (MOE) in static bending and internal adhesion. Test results were compared to commercial panels, produced with 100% Eucalyptus, considering the requirements specified by Brazilian Code. Properties presented values close to normative specifications, indicating positively the possibility of production of MDP using addition of waste paper impregnated.

With rapid increase of waste paper recycling, more and more researchers focus on the advanced technologies of sorting impurities form waste paper. The principals of main identification and sorting technologies are introduced in this paper, whose advantages and disadvantages are discussed. Because of importance of sorting technologies based on near-infrared spectroscopy, we emphasis its principle, application and research status etc.. At last, research and development tendency of identification and sorting technology are prospected.

Rabbit is a traditional textile material and has protein content about 93%. Rabbit hair wastes are abundantly present in textile processing due to its poor spinnability. In order to recycle the waste rabbit fiber effectively, the rabbit protein was researched. The papermaking method was performed for the first time and their properties of the hybrid paper were discussed in this study. Different contents of rabbit protein were successfully prepared and mixed with pulp fibers to remade papers. Finally, performances of these papers were characterized. The results showed that the surface of the rabbit protein paper was flat, white and writing fluently. The ink absorbance of novel paper increased. Moreover mechanical properties of the rabbit protein paper were stronger than the untreated paper. The folding endurance decreased firstly and then increased.

In this article, Fenton oxidation treatment technology was employed to the improving of quality of post treated wastewater from pulp & paper mills in order to increase the recycling ratio of final treated wastewater. The reaction conditions were optimized through single-factor experiments and the removal of color were tested for the optimizing. It was found in this study that the color of Fenton oxidation treated water was variegated with the extending of settling time. The optimized conditions were: Dosage of H2O2 was 682.1mg/L(30% m/m), 1.5 times theoretical consumption, 205mg/L FeSO47H2O (H2O2:FeSO4=15:1), the initial pH and the reaction time were 4.5 and 40min, respectively. The removal of the color and COD were 51.3% and 80% after Fenton treatment. GC-MS analysis shown that the contents of organic extracts and most of organic compounds reduced significantly after the oxidational treatment.

Paper industry produces large amounts of sludge with about 65wt% moisture content. Due to its complex composition, the charge of traditional disposal method is high and easy to bring about secondary pollution. In this paper, the influences of temperature, oxidation coefficient and residence time on the performance of supercritical water oxidation (SCWO) of paper mill sludge were investigated. The results show that SCWO can almost completely eliminate organics in sludge and obtain transparent liquid products meeting relative national standards at 550°C, 5min with an oxidation coefficient of 3.0. However, during this process, TN changes to NH3-N, so NH3-N in liquid products increases with operation parameters, indicating the recalcitrant nature of NH3-N, and which needs further treatment.

Both water repellency and water vapour barrier properties were endowed at paper surface by coating with beeswax-chitosan latex. It was found that the water vapour transmission rate of coated paper decreased as the drying temperature increased. However, water contact angle was not affected with it. Although the surface morphology deformed at high drying temperature, the roughness values maintained at micro-scale. Further analysis indicated that the water vapour barrier property of coated paper was influenced by the density of the coating layer.

Paper cutting, as an ancient and unique Chinese characteristics of the folk traditional culture elements, comes from people's daily life, which reflects people's the most simple pursuit and yearning for a better life , is an embodiment of a traditional concept of creation in life. As the time goes on, the full integration of folk paper-cut with local culture and a variety of unique styles embodies the concept of creation and the origin of cultural spirit is a great help to the modern design. With the exploration of paper-cut culture, this paper researches the modern product design, inspirates from its creation technique and art, in order to inherit the ancient folk culture, at the same time, gives some help to the product design in the new era.

Graphene paper (GP) with layered structure and highly conductive network is fabricated by a facile technique of vacuum filtration and studied as a single-component and binder-free anode of lithium ion batteries (LIBs). The process of fabrication of GP without any binder and high-temperature treatment, in the meantime, great improvement in both the capacity and cycling performance of the GP electrodes have compared with other kinds of traditional graphite electrode materials. Given the simplifying anode fabrication, low manufacturing costs and many electrochemical properties of the GP anode, it is regarded as an excellent anode material of LIB with great promise for its both excellent cycling performance and electrochemical properties. The specific capacity can reach to over 200 mAhg-1after 60 charge-discharge cycles under the current rate of 50 mAg-1.