超高速纺生产涤纶低缩丝的工艺探讨

研究了超高速纺工艺路线生产涤纶低缩丝的工艺特点,探讨了影响纺丝的主要工艺参数。结果表明:在高速纺设备上,通过控制切片的含水率、优化纤维冷却条件和纺丝温度,并采用超高速纺工艺路线可制备能直接服用的涤纶低缩丝。     

提高缝纫线型半光涤纶短纤维强度的工艺优化

缝纫线对涤纶短纤维的要求是强度高、伸长率低、热水洗涤后收缩率尽可能小。介绍了在天津石化10万t/a聚酯短丝装置上,利用现有设备生产1.33 dtex×38 mm半光缝纫线型涤纶短纤维的纺丝和后处理工艺技术特点,着重讨论了通过优化聚酯熔体黏度、纺丝温度、冷却条件、牵伸倍率以及热定形温度等工艺提高短纤维的断裂强度。     

涤纶微细旦丝生产装置及工艺

详细介绍生产涤纶微细旦丝装置中各设备型式、特点及相应的纺丝工艺要求，为获得稳态的纺丝过程，针对涤纶微细旦丝的特点，阐述了设备的适用性。     

熔体直纺全拉伸丝双头纺技术改造分析

在现有涤纶全拉伸丝(FDY)纺丝设备上,通过设备改造、工艺选择和优化,成功实现了FDY双头纺生产,弥补了长丝产品结构的不足,为企业创造了经济效益。     

涤纶工业丝熔体直纺生产技术的研发

采用液相增黏聚酯熔体,开发了200 kt/a涤纶工业丝熔体直纺生产技术,探讨了高黏熔体输送和大容量多头重旦纺丝等工艺,并与固相缩聚切片纺进行了对比分析。结果表明:涤纶工业丝熔体直纺技术省去了冷却切粒、固相缩聚、熔融挤出等工序,工艺流程紧凑,提高了生产效率,比固相缩聚熔融纺丝设备投资减少44.3%,生产能耗下降32.46%;生产的各种规格的涤纶工业丝质量指标符合国家标准GB/T16604—2008。     

锦纶6单根丝FDY高速纺丝技术的新突破

77 dtex/1 f,66 dtex/1 f,55 dtex/1 f锦纶6单根丝FDY高速纺丝技术,是继国内首创涤纶母丝FDY高速纺丝技术后,又一种自主研制的世界首创的纤维生产技术,是我国在纤维生产领域的新突破。本文从锦纶6单根丝技术的开发背景、特点、应用价值等方面作了阐述。     

32头直纺细旦涤纶FDY生产工艺探讨

采用特性黏数0.675 dL/g的半消光聚对苯二甲酸乙二醇酯(PET)熔体,在32头侧吹风纺丝设备上直纺生产细旦涤纶全拉伸丝(FDY),讨论了纺丝、卷绕工艺条件对生产工况及产品性能的影响。结果表明:在生产55.6 dtex/72 f涤纶FDY时,选择纺丝温度293℃,纺丝组件压力15～17 MPa,采用带有3组横向整流器的侧吹风,侧吹风速度0.55 m/s,使用新型"一"字孔油嘴上油,预网络压力0.09 MPa,纺丝速度4 600m/min,4热辊加热,拉伸倍数2.7,所生产的细旦涤纶FDY,产品优等率大于95%,设备运转率达97%。     

熔体直纺205 dtex/192f细旦扁平涤纶的开发

介绍了熔体直纺生产205 dtex/192f细旦扁平涤纶预取向丝(POY)的工艺路线,并讨论了纺丝温度、冷却成形、上油位置及方式、卷绕工艺、喷丝板选型等对生产细旦扁平涤纶POY的影响.结果表明:选择较高的纺丝温度,严格控制环吹风条件,适当提高集束点位置,优化上油均匀性,降低纺丝速度,适当提高卷绕张力,降低成型角,可制得质量较好的细旦扁平涤纶POY.     

涤纶POY微细旦丝平行纺丝设备及工艺探讨

介绍了涤纶POY微细旦丝平行纺丝卷绕设备及纺丝工艺技术特点。重点对纺丝箱体、卷绕机、冷却条件等设备及工艺特点进行了详细讨论。     

涤纶FDY12头纺改18头纺设备及工艺

在现有涤纶FDY12头纺设备上,通过对纺丝组件、侧吹风、卷绕机等设备改造,和对纺丝及卷绕工艺研究及优化,成功实现了18头纺稳态纺丝,提高了生产效率,增加了经济效益,为企业技术革新提供了新思路。     

焦油一次汽化温度计算方法的探讨

利用相平衡原理得出的焦油蒸馏时一次汽化温度的计算方法,其结果与按经验公式的计算结果进行了比较,同时讨论了一次汽化温度与焦油馏分产率及二段蒸发器过热蒸汽用量的关系。     

Techniques for screening adhesives for structural applications

—Due to its chemistry, no structural adhesive system (epoxies, acrylics, etc.) is likely to offer an ideal combination of toughness, strength, moisture resistance, and ambient-temperature curing. Therefore, for effective use of adhesives in primary structures, an engineer must be able to identify adhesives that represent an optimum compromise among the different properties. In this paper, we present techniques for screening high-strength, ambient-temperature-curing adhesives for (1) moisture resistance under sustained loading and (2) fracture resistance in a way that is directly related to joint performance.     

Efficacy for Whitlockite for Augmenting Spinal Fusion

Whitlockite (WH) is the second most abundant inorganic component of human bone, accounting for approximately 25% of bone tissue. This study investigated the role of WH in bone remodeling and formation in a mouse spinal fusion model. Specifically, morphology and composition analysis, tests of porosity and surface area, thermogravimetric analysis, an ion-release test, and a cell viability test were conducted to analyze the properties of bone substitutes. The MagOss group received WH, Group A received 100% beta-tricalcium phosphate (β-TCP), Group B received 100% hydroxyapatite (HAp), Group C received 30% HAp/70% β-TCP, and Group D received 60% HAp/40% β-TCP (n = 10 each). All mice were sacrificed 6 weeks after implantation, and micro-CT, hematoxylin and eosin (HE) staining, and Masson trichome (MT) staining and immunohistochemistry were performed. The MagOss group showed more homogeneous and smaller grains, and nanopores (<500 nm) were found in only the MagOss group. On micro-CT, the MagOss group showed larger fusion mass and better graft incorporation into the decorticate mouse spine than other groups. In the in vivo experiment with HE staining, the MagOss group showed the highest new bone area (mean: decortication group, 9.50%; A, 15.08%; B, 15.70%; C, 14.76%; D, 14.70%; MagOss, 22.69%; p < 0.0001). In MT staining, the MagOss group demonstrated the highest new bone area (mean: decortication group, 15.62%; A, 21.41%; B, 22.86%; C, 23.07%; D, 22.47%; MagOss, 26.29%; p < 0.0001). In an immunohistochemical analysis for osteocalcin, osteopontin, and CD31, the MagOss group showed a higher positive area than other groups. WH showed comparable bone conductivity to HAp and β-TCP and increased new bone formation. WH is likely to be used as an improved bone substitute with better bone conductivity than HAp and β-TCP.     

Demand Increases for New Fungicides for Rice

<正> After June this year China's regions growingmiddle and late rice had widespread blastand sheath/culm blight.Such diseasesplagued 19.2 million hectares.Starting fromJuly the market for new fungicides that cancontrol blast and sheath/culm blight for ricewas more and more active.Makers of traditional pesticides for thecontrol of blast have to contend with fiercecompetition from new pesticides in marketthis year.Kitazine,iprobenfos,isoprothiolane and tricyclazole,oftenused by farmers in the past,are graduallybeing replaced by new varieties with high