Advanced Materials Research Vols. 236-238

Abstract: In this paper, the authors explore the structure and operating mechanism of the energy- saving type multi-channel drying cylinder, which can be used in papermaking machine dryer section to effectively reduce the amount of condensate water, and tackle such problem as the water condensation in drying cylinder. This paper theoretically expatiates upon the heat transfer mechanism of the multi-channel drying cylinder of energy-saving type and verifies the theoretical results with numerical simulation approach, which proves that energy-saving type multi-channel drying cylinder can effectively improve the heat transfer efficiency, and increase the productivity of the papermaking machine while the drying cylinder is featured by high cost in manufacturing and non-uniformity in surface temperature because of its peculiarity of configuration, which need to be investigated and improved.

Abstract: The heat transfer printing is a new application of printing to textile industry. At present, there are no unified standards and parameters. In this paper, The parameters such as printing density, printing color gamut, the color efficiency of heat transfer printing papers and fabrics are tested. The evaluated printing quality parameters are put forward, therefore the reference standards are provided the reliable guidance for the heat transfer printing industry.

Abstract: The Americal Old Corrugated Containers (AOCC) was treated with laccase. Fiber morphology, molecular weight and distribution of lignin were analyzed by scanning electron microscope (SEM) and gel permeation chromatography (GPC). Through the model compound of lignin (ferulic acid) was treated by laccase, the correlative mechanism for improvement of the wet-strength of pulp by laccase was discussed. The results showed that the molecular weight of lignin decreased and the lignin adhered on the fiber surface after the pulp was treated by laccase. While the laccase treated pulp with heating treatment, the condensation degree of lignin and adhesion area on fiber increased. In addition, when the ferulic acid was treated by laccase, the results were similar to AOCC pulp.

Abstract: In this paper, the hemicelluloses was extracted by alkali from aspen, then it was made to be surface enhance agent by cationic modification. The original and modified hemicelluloses were characterized by FT-IR and GC. The effect of hemicelluloses species, content and treatment time on the strength of paper were studied. The results showed that the optimum content of cationic hemicelluloses for surface enhance was 6% at 35°C for 15s. In the conditions, the tensile strength and crushing strength were increased by more than one time. Compared with the original hemicelluloses, when substitution degree of the cationic hemicelluloses was higher than 0.03, the modified hemicelluloses with better quality of surface enhance.

Abstract: The preparation of alumina silicate refractory fiberboard by wet vacuum filter molding process, alumina silicate fibre is the matrix material, and high-temperature resistance adhesive is the agglutinant. Experiments made in conditions of no liquid glue, and not adding fiber, influence of cycling time on liquid glue concentration, density of fiberboard, and retention of cementing compound was studied; effect of density of fiberboard on thermal conductivity is also discussed. The results showed that the optimum liquid glue concentration is 9.41%, cycling time is 28h (replenish liquid glue after 28h). Density of alumina silicate fiberboard is 289kg/m³, and alumina silicate fiberboard can resistance to 1200 °C.

Abstract: Single factor experiment was used to investigate neutral deinking technology of old magazine paper (OMG) by self-compounded NTM-2 deinking agent. Olympus inverted biological microscope were used to research distribution state of ink particles in the secondary pulp before and after deinking treatment. Scanning electron microscopy (SEM) was used to analyze fiber surface changing during neutral deinking and ink particles dispersing behaviors in the paper. The results showed that NTM-2 deinking agent had a good deinking effect to OMG, optimum operation conditions of neutral deinking was NTM-2 0.5%, deinking temperature 50°C, deinking time 40min, repulper time 25s, pulp consistence 1.0%, and floatation time 6 min. Under these conditions, brightness of the deinked pulp increased 8.4%SBD, and the ink removal efficiency reached by 90%. Olympus inverted biological microscope images showed that there were a large number of ink particles in the un-treated pulp, and these ink particles integrated with fibers tightly. After treated by neutral deinking, most of ink particles were separated from the fiber, dispersed and suspended in the pulp evenly. SEM images indicated that there were little ink particles in the secondary paper, the fiber surface turned more smoother, and the clean degree would nearly corresponding to the effect of alkaline deinking.

Abstract: The wet picking and wet resistance of offset papers were studied using IGT-gst2 printability tester according to change printing conditions as printing speed and the amount of fountain solutions. It was showed that the phenomena of wet picking and wet resistance occurred in turn on the surface of offset papers with increased printing speed and the amount of fountain solution. In addition, in contrast with fountain solutions, printing speed had greater influence on the phenomena of wet picking and wet resistance of offset papers.

Abstract: Rosin as a natural renewable resource has become an important research topic. The esterifiable rosin used to do the cation neutral sizing agent has the advantages of low dosage, good effect, and low demand for equipment. In this paper, the rosin esterification reaction temperature, reaction time had been made a detailed discussion. When the reaction temperature is 230°C, the reaction time is 6h, the dosage of ZnO (as the catalyst) is 0.2% (relative to the rosin), the acid value of rosin is the lowest, and the esterification has the most complete response. The emulsified rosin glyceride as the sizing was used in papermaking. The results showed that the sizing degree of paper was the highest when the dosage of sizing and Al₂ (SO₄)₃ were both 1.5 %( relative to the dry pulp).

Abstract: In recent years High yield pulp (HYP) is being used at an increasing rate to replace bleached hardwood kraft pulp in the manufacturing of high quality paper products. However, HYP has more dissolved and colloidal substances (DCS), when compared with fully bleached kraft pulp. In general these DCS have an anionic character, and they often disturb the papermaking process. In the paper, the effects of high charge density polyamine (PA) single, dual and triple system on DCS control in high yield pulp were studied. The results showed that the DCS control effects of the PA/HCS (high cationic starch)/CPAM (cationic polyacrylamide) triple system were better than the PA/HCS dual system and the PA single system. In the PA/HCS/CPAM triple system, when the dosage of the PA was 0.06% and the dosage was 0.1% and 0.05% for HCS and CPAM, respectively, the zeta potential of pulp increased by a certain degree, drainage property of pulp improved remarkably, the turbidity of the DCS water was near to zero, and the cationic demand of DCS water decreased by 70.8%. The microscope photograph of fibers also confirmed that the polymers in the PA/HCS/CPAM triple system had very good synergetic effects on the removal of DCS in high yield pulp.

Abstract: Eco-friendly high-yield pulps (HYP) are becoming increasingly used to product high value-added fine paper that is traditionally produced exclusively with chemical pulps. However, due to the presence of a large quantity of photosensitive lignin in the HYP pulp to more effectively utilize woods resources, there is a concern on the long term brightness stability of HYP containing paper. In this research, various TiO₂ was added to coating colors to improve the light fastness properties of HYP containing coated paper. The effect on the stability of optical properties of coated paper including brightness, opacity, color difference and the degree of brightness reversion before and after accelerated aging were studied. It was shown that the brightness stability of the HYP containing coated paper increased with increased addition of TiO₂. Rutile TiO₂ was especially more effective than other types of TiO₂ on yellowing inhibition of coated paper. At a dosage of 3 parts of rutile TiO₂, the brightness stability of coated paper containing 20% of HYP was found to be even better than paper made of 100% chemical pulp coated with conventional coating color.