粘胶短纤维超倍长纤维的产生及控制

对粘胶短纤维生产中产生超倍长纤维的原因进行了分析，提出了避免产生超倍长纤维的相应措施。     

产生超倍长纤维的因素及解决办法

分析了在粘胶短纤维生产中产生超倍长纤维的因素，实施了相应地解决措施，超倍长纤维降等率由60％～70％下降到15％～20％。     

粘胶短纤维产生超倍长因素的探讨

讨论了粘胶短纤维在生产过程中出现超倍长纤维的原因和一些解决方法。导致纤维超倍长的主要因素除切断机本身问题外,大致是：切断机运转操作不良;折叠丝束;纺丝过程出现乱丝、断丝;积压丝处理不当。     

涤纶短纤维超倍长影响因素探讨

探讨了涤纶短纤维生产过程中纺丝和后处理的工艺设备对超长、倍长纤维的影响。     

涤纶短纤维超倍长影响因素探讨

探讨了涤纶短纤维生产过程中纺丝和后处理的工艺设备对超长、倍长纤维的影响。     

聚酯短纤维超倍长问题探析

全面阐述聚酯短纤维超倍长的形成机理和过程 ,并结合生产实践经验 ,从设备和工艺角度分析聚酯短纤维生产中产生超倍长纤维的原因 ,提出预防及控制措施。     

短纤维超倍长的设备因素探讨

阐述了聚酯短纤维超倍长的形成机理和过程，并结合生产实践，主要从设备角度分析聚酯短纤维生产中超倍长纤维产生的原因，并提出控制措施。     

涤纶短纤维加工过程中超倍长问题探索

本文针对仪征化纤工业联合公司的生产设备,通过总结长期现场生产经验,对涤纶短纤维加工过程中产生超倍长的原因,从工艺、设备、操作等方面进行分析,然后再根据已发生的现象,判断原因,达到控制,降低超倍长纤维含量,提高成品质量的目的。最后还列出超倍长原因鱼刺图,供推广借鉴。     

国内外超高强度聚乙烯纤维研发和生产现状

超高强度、超高分子量聚乙烯纤维(UHMW-PEF)是继碳纤维、芳纶纤维之后的第三代高强高模高科技特种纤维。超高强度聚乙烯纤维在水中的自由断裂长度为无限长,在粗细相同的情况下,它所能承受的最大质量是钢丝绳的8倍,是继碳纤维、芳纶纤维之后的第三代超高强度纤维,在     

信息动态

超高强度聚乙烯纤维国产化超高强度聚乙烯纤维在水中的自由断裂长度为无限长,在粗细相同的情况下,它所能承受的最大质量是钢丝绳的8倍,是继碳纤维、芳纶之后的第三代超高强度纤维,在军事工业和航天航空领域均有不可替代的作用。这种超高强度聚乙烯纤维曾经只有荷兰、美国两个国     

影响涤纶短纤维质量因素探讨

探讨了生产涤纶短纤维过程中产生超长、倍长纤维,卷曲率波动和比电阻升高的原因。指出：环吹风温度、湿度、速度、喷丝头拉伸比、拉伸温度等发生波动,生产设备运行状态不良,都会产生超长、倍长纤维;卷曲温度、压力、卷曲轮间隙决定卷曲率的大小;比电阻与空气湿度有关。     

Effect of fiber length on processing and properties of extruded wood‐fiber/HDPE composites

Fiber length and distribution play important roles in the processing and mechanical performance of fiber‐based products such as paper and fiberboard. In the case of wood–plastic composites (WPC), the production of WPC with long fibers has been neglected, because they are difficult to handle with current production equipment. This study provides a better understanding of the effect of fiber length on WPC processing and properties. The objectives of this study were therefore to determine the role of fiber length in the formation process and property development of WPC. Three chemithermomechanical pulps (CTMP) with different lengths, distributions, and length‐to‐diameter ratios (L/D) were obtained by mechanical refining. Length, shape, and distribution were characterized using a fiber quality analyzer (FQA). The rheometer torque properties of high‐density polyethylene (HDPE) filled with the pulps at different loads were studied. Variations in fiber load and length distribution resulted in significant variations in melting properties and torque characteristics. Composites from the three length distributions were successfully processed using extrusion. Physical and mechanical properties of the obtained composites varied with both length distribution and additive type. Mechanical properties increased with increasing fiber length, whereas performance in water immersion tests decreased. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

锦纶细旦短纤维的纺制技术探讨

分析了锦纶细旦短纤维生产过程中产生疵点、毛丝、倍长纤维的原因。重点讨论了纺丝工艺及后加工工艺等对该纤维质量的影响。指出选择合适的切片、适当提高箱体温度和熔体压力、改变喷丝板结构,严格控制拉伸倍数等工艺因素可制取性能优良的１．６７ｄｔｅｘ×３８ｍｍ锦纶细旦短纤维。     

Fiber length distribution effects on the fracture of short-fiber composites

The effect of fiber geometry on the fracture behavior of short glass fiber-reinforced nylons was examined. In particular a comparison was made between conventional short-fiber composites (with feedstock made by an extrusion process) and the newer pultruded feedstock materials which have longer fiber length distributions but larger fiber diameters. The toughness of the material was measured over a wide range of loading rates, from impact conditions, using Kc and Gc type tests, to long term, slow crack growth tests. The moisture content of the materials was varied from dry to saturated. It was found that there was little difference in fracture toughness when the materials were dry. However, when moist, the longer fiber material showed significant improvements over the conventional short-fiber-reinforced material. This behavior is explained in terms of the changes in fiber geometry.     

Effect of processing conditions on wood and glass fiber length attrition during twin screw composite compounding

In this study, we compare the effect of twin-screw extrusion processing on the attrition of wood fibers (WFs) with glass fiber. The effects of process variables and screw design on fiber length were investigated by performing a range of dead-stop experiments where the extruder was stopped, opened-up, and compound removed from the screw elements. Fibers, chemically extracted from the polypropylene matrix, were analyzed for length and width using a commercial fiber analyzer. It was found that WF length attrition and composite properties were less affected by screw design and twin-screw processing conditions (feed rate and screw speed) than glass fiber. Length weighted fiber length and X50 length (a measure used in particle size analysis) were equally correlated with process conditions and composite performance for both fiber types. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137, 48551.     

改进腈纶膨体毛条纤维长度分布的探讨

为改进腈纶膨体毛条纤维长度分布,满足纺纱和织物新产品研发的要求,对原料质量、拉断法工艺和设备等影响膨体毛条纤维长度分布的因素进行了试验,通过严把原料质量关、优化拉断机工艺参数、提高设备完好率等措施,可有效控制膨体毛条纤维长度分布,生产出优质膨体毛条产品。     

腈纶毛条纤维平均长度工艺控制的研究

腈纶丝束采用拉断工艺方法制条。分析了腈纶丝束本身质量对拉断纤维长度的影响,指出改进生产工艺,适当调整拉断机再割区隔距和拉伸倍数,可缩小纤维平均长度波动偏差,从而提高产品质量。     

Preparation and mechanical performance of ductile Csf/Al2O3-BN composites,Part 1: Effects of fiber length and sintering temperature

Since its invention, alumina ceramics have been extensively investigated for potential various applications. However, their intrinsic brittle nature is still an insurmountable obstacle when they are applied as structural components. This paper provides a simple routs to prepare ductile alumina based composites with the addition of chopped carbon fiber (C_sf/Al₂O₃-BN). Effects of fiber length and sintering temperature on the microstructure, phase composition, mechanical properties together with fracture behavior were systematically investigated. The results showed that composites with mixed fiber lengths of 12 mm and 1 mm exhibited homogeneous microstructure and striking enhancement in mechanical performances compared with composites with other fiber length. With the increase in sintering temperature from 1500 °C to 1650 °C, interfacial bonding strength increased and interface state converted from mechanical interlocking at 1500 °C into chemical bonding at 1650 °C. Chemical reaction in the composites degraded carbon fiber properties, which resulted in the decrease in mechanical performance of the composites.