低定量高白度胶印新闻纸打浆工艺的探讨

本文结合岳阳纸业集团公司1#新闻纸机实际生产情况,探讨了如何从打浆工艺方面改善纸机抄造性能,提高成纸质量。着重研究了浆料叩解度对成纸水分、不透明度、撕裂指数、平滑度、两面差、填料留着率的影响及其随浆料叩解度变化的规律,还探讨了上网浓度、浆料叩解度对成纸匀度的影响,及淀粉加入量、浆料叩解度对新闻纸表面强度的影响,当上网浓度在0.75％～0.8O％,浆料叩解度60～64°SR时,对纸机抄造性能及成纸质量有较大改善。     

配抄SC纸的DIP浆生产技术

传统的SC纸使用的浆料配比一般是70％～90％机械木浆（GP、PCW、TMP）及30％～10％漂白木浆。随着DIP制浆技术的发展,DIP已经成为生产SC纸的优良纤维原料。用于配抄SC纸的DIP工艺流程以碎浆、筛选、净化、浮选脱墨、热分散处理、漂白、脱水洗涤处理为主,但SC纸比新闻纸对DIP浆料的白度、尘埃和胶粘物的去除要求更高。DIP纤维配比主要取决于生产的SC纸等级。     

SGW在高速纸机中的现状与优化

目前，国际及国内新闻纸厂都以规模大、机台少、自动化程度高、产品好为特征，相应的浆料配比也呈多样化，除传统的KP、SGW外，还有TMP、CTMP、APMP．DIP及商品浆等，由于新闻纸具有无长期保存价值，故新闻纸厂都谋求最廉价的浆料配比在大型高速纸机上生产，以降低生产成本，以强度较差的廉价浆料，如DIP和SGW在高速纸机上抄造新闻纸，而且又要适应高速印刷机的要求，因此，对浆料的质量提出了更高的要求，对于原有SGW工艺技术装备已不适应，     

打浆对木浆加填硅灰石效果的影响

研究了木浆加填硅灰石造纸时,打浆对于成纸强度性能以及硅灰石留着情况的影响。结果表明,打浆对木浆加填硅灰石造纸具有一定改善效果,针叶木浆与阔叶木浆打浆度分别为48～52°SR和44～48°SR时,加填硅灰石成纸的强度最大;针叶木浆与阔叶木浆打浆度分别为52°SR和48°SR时,硅灰石留着情况最佳。硅灰石在木浆中的留着率较高,远高于其他常规造纸填料。     

配抄SC纸的DLP浆生产技术

传统的SC纸使用的浆料配比一般是70%～90%机械木浆(GP、PCW、TMP)及50%～1O%漂白木浆.随着DlP制浆技术的发展,DlP已经成为生产SC纸的优良纤维原料.用于配抄SC纸的DIP工艺流程以碎浆、筛选、净化、浮选脱墨、热分散处理、漂白、脱水洗涤处理为主,但SC纸此新闻纸对DlP浆料的白度、尘埃和胶粘物的去除要求更高.DlP纤维配比主要取决于生产的SC纸等级.     

造纸及化学品相关专利信息

专利名称：新型教材纸的生产工艺 申请号：200910013718.3公开号：CN101457498 申请日：2009-01-03公开日：2009-06-17 申请人：华泰集团有限公司 本发明涉及造纸行业中的一种利用废纸弱碱性脱墨浆生产新型教材纸的生产工艺。其技术方案是：配浆工序原料组成及质量配比为：NBKP 8%～10%,打浆浓度35%～4.5%,打浆度30～50°SR,湿重6～8 g;杨木浆20%～30%,打浆浓度3.5%～4.5%,     

木浆填加硅灰石的效果研究

研究了硅灰石作为木浆填料造纸时,硅灰石的加填量及纸浆打浆度等工艺条件对于成纸强度性能以及硅灰石留着情况的影响.结果表明,成纸物理强度随硅灰石加填量的增加而下降,但硅灰石加填量为30%时成纸强度性仍满足一般印刷类用纸及文化用纸的要求;纸浆打浆度的提高对提高纸页强度及硅灰石的留着率有一定帮助,纸浆打浆度为44°SR～48°SR时木浆填加硅灰石成纸的强度最大,纸浆打浆度为48°SR时硅灰石留着情况最佳;硅灰石留着率在75%以上,远高于常规造纸填料.     

鲜花装饰纸基纸生产工艺的研究

通过正交试验探讨了鲜花纸生产工艺过程中基纸的纸浆种类、打浆度及其配比等.实验结果表明,利用长纤维针叶木浆和短纤维草浆,并且在针叶木浆打浆度为64°SR,麦草浆打浆度为42°SR,配比为60∶40时基纸性能最佳,其主要性能指标为:抗张指数为53.23N·m/g,定量为95g/m2.     

纸浆打浆度对石膏微纤维纸增强效果的影响

石膏微纤维化学性质稳定,在水中有一定的溶解度,加入到纸浆中时应尽量减少其溶解,同时石膏微纤维比较硬、脆性大、易被折断,在分散时应避免用力搅拌.为了探讨不同打浆度时石膏微纤维对纸张增强应用的影响,将石膏微纤维以一定比例加入到不同打浆度的植物纤维浆料中,得出了石膏微纤维应用于纸张增强时纸浆打浆度的最佳工艺条件:针叶木浆53～57°SR,石膏微纤维用量40%;阔叶木浆50～53°SR,石膏微纤维用量20%;草木混合浆(针叶木浆:草浆=3:7)52～61°SR,石膏微纤维用量20%.     

打浆度和纤维配比对液体包装纸板面层纤维基片性能的影响

利用液体包装纸板的实际生产工艺,探讨了不同打浆度和纤维配比对液体包装纸板面层纤维基片抗张指数、撕裂指数、耐破指数、挺度、松厚度和内结合强度的影响,并通过压痕测试研究了其在加工应用上的适应性。结果表明,在改善液体包装纸板面层纤维基片强度性能上,优化打浆工艺比增加针叶木浆配比效果更好,针叶木浆/阔叶木浆配比为1∶1,打浆度22°SR时撕裂指数最大为13.4 mN·m~2/g;打浆度25°SR时挺度最大为85.9 mN·m;打浆度29°SR时耐破指数和抗张指数最大分别为5.82 kPa·m~2/g和68.2 N·m/g,此条件下压痕测试数据和效果表现佳。     

Reliable identification of grapevine rootstock varieties using RAPD PCR on woody samples

Since grapevine ( Vitis spp .) rootstock material is being traded increasingly as disbudded woody material a lack of distinctive morphological features on such material necessitates an alternative and reliable means of identification. Methods described here were developed for rapid and efficient extraction of DNA from woody samples rich in phenolic compounds and polysaccharides, and for subsequent identification of varieties by RAPD PCR. Using these methods, and with the application of only one selected RAPD primer, we were able to differentiate sixteen rootstock varieties, including the seven varieties most commonly used in Germany. Problems commonly encountered with reproducibility of RAPD patterns were avoided by choosing primers with a dinucleotide sequence and a high G/C content that allowed a rather high annealing temperature of 45°C. Methods described here should also be useful for other horticultural crops, especially those with woody tissues rich in phenolic compounds and polysaccharides.     

Chlorohydrins of bisphenol A diglycidyl ether (BADGE) and of bisphenol F diglycidyl ether (BFDGE) in canned foods and ready-to-drink coffees from the Japanese market

BADGE.2HCl and BFDGE.2HCl were determined in 28 samples of ready-to-drink canned coffee and 18 samples of canned vegetables (10 corn, 5 tomatoes and 3 others), all from the Japanese market. HPLC was used as the principal analytical method and GCMS for confirmation of relevant LC fractions. BADGE.2HCl was found to be present in one canned coffee and five samples of corn, BFDGE.2HCl in four samples of canned tomatoes and in one canned corn. No sample was found which exceeded the 1mg/kg limit of the EU for the BADGE chlorohydrins. However the highest concentration was found for the sum of BFDGE.2HCl and BFDGE.HCl.H₂O at a level of 1.5mg/kg. A Beilstein test confirmed that all cans containing foods contaminated with BADGE.2HCl or BFDGE.2HCl had at lest one part coated with a PVC organosol.     

Aroma characterization of various apricot varieties using headspace–solid phase microextraction combined with gas chromatography–mass spectrometry and gas chromatography–olfactometry

The characterization of the aromatic profile of several apricot cultivars with molecular tracers in order to obtain objective data concerning the aromatic quality of this fruit was undertaken using headspace–solid phase microextraction (HS–SPME). Six apricot cultivars were selected according to their organoleptic characteristics: Iranien, Orangered, Goldrich, Hargrand, Rouge du Roussillon and A4025. The aromatic intensity of these varieties measured by HS–SPME–Olfactometry were defined and classified according to the presence and the intensity of grassy, fruity and apricot like notes. In the six varieties, 23 common volatile compounds were identified by HS–SPME–GC–MS. Finally, 10 compounds, ethyl acetate, hexyl acetate, limonene, β-cyclocitral, γ-decalactone, 6-methyl-5-hepten-2-one, linalool, β-ionone, menthone and (E)-hexen-2-al were recognized by HS–SPME–GC–O as responsible of the aromatic notes involved in apricot aroma and considered as molecular tracers of apricot aromatic quality which could be utilized to discriminate apricot varieties.     

European priorities for research to support legislation in the area of food contact materials and articles

A strong science base is required to underpin the planning and decision-making process involved in determining future European community legislation on materials and articles in contact with food. Significant progress has been made in the past 5 years in European funded work in this area, with many developments contributing to a much better understanding of the migration process, and better and simpler approaches to food control. In this paper this progress is reviewed against previously identified work-areas (identified in 1994) and conclusions are reached about future requirements for R&D to support legislation on food contact materials and articles over the next 5 or so years.     

Tests of potential functional barriers for laminated multilayer food packages. Part I: Low molecular weight permeants

The advent of the functional barrier concept in food packaging has brought with it a requirement for fast tests of permeation through potential barrier materials. In such tests it would be convenient for both foodstuffs and materials below the functional barrier (sub-barrier materials) to be represented by standard simulants. By means of inverse gas chromatography, liquid paraffin spiked with appropriate permeants was considered as a potential simulant of sub-barrier materials based on polypropylene (PP) or similar polyolefins. Experiments were performed to characterize the kinetics of the permeation of low molecular weight model permeants (octene, toluene and isopropanol) from liquid paraffin, through a surrogate potential functional barrier (25 μm-thick oriented PP) into the food simulants olive oil and 3% (w/v) acetic acid. These permeation results were interpreted in terms of three permeation kinetic models regarding the solubility of a particular model permeant in the post-barrier medium (i.e. the food simulant). The results obtained justify the development and evaluation of liquid sub-barrier simulants that would allow flexible yet rigorous testing of new laminated multilayer packaging materials.     

Textural Properties of Cold-set Gels Induced from Heat-denatured Whey Protein Isolates

A 9% whey protein (WP) isolate solution at pH 7.0 was heat-denatured at 80°C for 30 min. Size-exclusion HPLC showed that native WP formed soluble aggregates after heat-treatment. Additions of CaCl2 (10–40 mM), NaCl (50–400 mM) or glucono-delta-lactone (GDL, 0.4–2.0%, w/v) or hydrolysis by a protease from Bacillus licheniformis caused gelation of the denatured solution at 45°C. Textural parameters, hardness, adhesiveness, and cohesiveness of the gels so formed changed markedly with concentration of added salts or pH by added GDL. Maximum gel hardness occurred at 200 mM NaCl or pH 4.7. Increasing CaCl2 concentration continuously increased gel hardness. Generally, GDL-induced gels were harder than salt-induced gels, and much harder than the protease-induced gel.     

Influence des ions sur le pouvoir hydratant de l'ure e: e tude sur peau de porc ex vivo

This study deals with the influence of ions (NaCl and MgSO4) in a W/O emulsion containing 10% urea. Moisturization kinetics are assessed by corneometry on pig skin ex vivo. The formula's influence on urea penetration is measured by infrared spectrometry with an ATR device and the stripping method. Corneometry and spectroscopy were chosen to record simultaneously the hydratation levels and urea localization into superficial cell layers. Urea crystallization after evaporation of emulsions and aqueous solutions is described. Results show that urea does not hydrate nor penetrate when applied to the skin through an aqueous gel. In a W/O emulsion, sodium chloride increases the ability of urea to moisturize without improving penetration. In vitro urea crystallization is disturbed by sodium chloride or magnesium sulphate for solutions and emulsions. This stabilization by ions is correlated with good moisturization values. The stabilization of urea in the solute state provided by ions increases its water epidermal binding capacity without enhancing penetration.     

Occurrence of bisphenol-F-diglycidyl ether (BFDGE) in fish canned in oil

The levels of bisphenol-F-diglycidyl ether (BFDGE) were quantified as part of a European survey on the migration of residues of epoxy resins into oil from canned fish. The contents of BFDGE in cans, lids and fish collected from all 15 Member States of the European Union and Switzerland were analysed in 382 samples. Cans and lids were separately extracted with acetonitrile. The extraction from fish was carried out with hexane followed by re-extraction with acetonitrile. The analysis was performed by reverse phase HPL C with fluorescence detection. BFDGE could be detected in 12% of the fish, 24% of the cans and 18% of the lids. Only 3% of the fish contained BFDGE in concentrations considerably above 1mg/kg. In addition to the presented data, a comparison was made with the levels of BADGE (bisphenol-A-diglycidyl ether)analysed in the same products in the context of a previous study.     

Analysis on Economic Indicators from 62 Enterprises in Printing Machinery Industry in Q1 2014

Operation of printing machine industry was still unsatisfactory in the first quarter of 2014.Analysis on operation of printing machine industry.a.Market demand was not strong;sales of product undulated and declined.According to the statistics,the total industrial output value fell by 19.28% in the first quarter of 2014 than the average quarter value in 2013; industrial added value decreased by 4.16%; sales revenue dropped by 22.83%. h. Business operation of enterprises was in poor condition. c. R＆D of new products is an important transformation guarantee for enterprises. d. To take self explore new ways upgrading advantages,and explore new ways.