2MW风电轮毂低温球铁的生产工艺

介绍了风电轮毂球铁的生产工艺,采用感应电炉全废钢增碳工艺生产耐低温冲击韧性的球墨铸铁轮毂,熔炼工艺简单可靠.采用气动脱硫,铁液预处理工艺,无需加入金属[Ni]；通过精确控制化学成分尤其是ω[Si]、ω[Mn]、ω[P]元素含量,铸态下较易达到低温(-40℃)冲击韧性(Akv)、屈服强度(Rp0.2)和延伸率要求,数值波动小,稳定性好；MT探伤和UT探伤符合欧洲标准2～3级要求,己连续生产数年,熔炼工艺已趋成熟.     

Effect of Alkaline Hemicellulose Extraction on Kraft Pulp Fibers from Eucalyptus Grandis

Abstract

The alkaline extraction of hemicelluloses from hardwoods prior to pulping, for further conversion to value-added products, seems to be a promising pathway for paper mills to increase profit and improve sustainability. However, the amount of hemicellulose extracted will be limited by the requirement to maintain pulp quality and pulp yield in comparison to existing pulping processes. The effects of NaOH concentration, temperature, and time on hemicellulose extraction of Eucalyptus grandis were studied using a statistical experimental design. Extracted wood chips were subjected to kraft pulping to evaluate the effect of the extraction on cooking chemicals, pulp quality, and handsheet paper strengths. The selective xylan recovery (12.4% dry mass) from E. grandis combined with low-cooking, active alkali charge, and less cooking time advantaged the xylan extraction and subsequent modified kraft pulping process under the studied conditions. Pulp viscosity, breaking strength, and tensile index of handsheets were slightly improved.     

新型中性施胶体系及其施胶研究

介绍了制备聚合氯化铝与阴离子有机高分子复合物的研究和开发。对三类复合聚合氯化铝-有机聚合物/阴离子分散松香胶（PACP/DRS）用于漂白碱法-AQ麦草浆进行中性施胶的效果进行了比较。     

高草浆配比中性抄纸技术

以AKD为例,阐述了在高草浆配比中的中性抄纸技术.     

Study of the Fate of Lipophilic Wood Extractives During Acid Sulphite Pulping Process by Ultrasonic Solid-Liquid Extraction and Gas Chromatography Mass Spectrometry

Abstract

Lipophilic extractives in dissolving pulp are still a big concern for pulp industries due to their detrimental effect on the quality of pulp. Since lipophilic extractives remaining in pulp are trapped in low-accessible fiber structures, effective extraction methods need to be established for studying their fate in the process. A simple, ultrasonic, solid liquid extraction established in this study was found to be more effective in capturing extractive residues in all “elemental chlorine-free” bleaching stages. Its efficiency was dependent on the extraction temperature, time, and solvent composition. A linearly correlated removal pattern of sterols and unsaturated fatty acids by the bleaching sequence was observed. It was further found that the bleaching combination did not fully remove lipophilic extractives. This study suggests an opportunity to explore ultrasonication-based extraction as an effective extraction procedure prior to gas chromatography mass spectrometry analysis for monitoring extractives in pulp.     

Pulp Fiction? Re-innovation of Paper Manufacture from Textiles

Abstract

Papermaking is once again under consideration as a new market for waste textiles in the UK. Whereas in the eighteenth and nineteenth centuries the driver was to provide a convenient and cheap form of cellulose, now the need is to create markets for waste textiles that are disposed of to incineration or landfill, or which go to declining recycling markets such as wipers or mattress fillings. Technical and economic issues are substantial and it may be that the end product of the papermaking process will not resemble the original product of 200 years ago. This article will consider the technical challenges and theoretical understanding of this re-innovation process. It will explore how the changing costs of environmental regulation compliance, and changing consumer preferences are leading to the revisiting of processes in the UK that were previously abandoned.     

Viscosity of cocoa butter

The viscosity of cocoa butter was measured in the range of temperatures 30‐70°C. Product in thawed state behaved as the Newtonian fluid with viscosity independent of shear rate. This behaviour was changed when the temperature reached 30°C. From this temperature the product behaved as non‐Newtonian fluid which was caused by the presence of the first fat crystals. The solidification was detected between 27‐30°C. A comparison of the measured data of viscosity with literature data has been done. The good agreement of literature data enabled us to select the general equation for prediction of cocoa butter viscosity in the thawed state as a function of temperature for the range 30‐97°C.     

Behavior of Eucalyptus Kraft Pulp Extractives Components across ECF Bleaching and Their Impact on Brightness Reversion

Abstract

This study investigated the chemical composition of the dichloromethane and acetone extracts of eucalypt pulp across D(EP)DP and AZDP bleaching sequences by gas chromatography-mass spectrometry (GC-MS). The bleaching stages led to the partial removal and to several oxidative transformations of fatty acids and sterols, the main lipophilic extractives found in the unbleached pulp. The pulp samples were bleached to 90–91% ISO by D(EP)DP and AZDP sequences and their brightness stability and chemical characteristics determined. The effect of aging on brightness was investigated. The AZDP bleaching sequence resulted in pulps of higher brightness stability. Furoic structures representing the main acid degradation products of HexA are suggested as the actual intermediates that cause yellowing by forming colored compounds. The AZDP process removed larger amounts of HexA across bleaching.     

一种实用新型矿浆分配桶的设计

通过对矿浆分配桶的设计改进做到矿浆分流可选择，使其可人工调配矿浆量，同时便于维修、更换，达到节能降耗的目的，最大限度地节约了运行成本，提高工作效率。