熔喷法用高熔融指数聚丙烯

1熔喷工艺熔喷法是一种一步生产非织造布的工艺(由切片到纤网)。在加工过程中,高速空气将从挤压机模头端出来的熔融态热塑性树脂吹到一个成网帘带上或成网滚筒上,形成细纤维自粘合纤网。高流速的熔体从一个带有一单排小孔的模头挤出,然后通过热空气喷嘴,将熔体吹成非常细的纤维     

滤材用聚对苯二甲酸丁二酯熔喷非织造布的研制

利用熔喷非织造成网系统,制备了滤材用高熔融指数的聚对苯二甲酸丁二酯(PBT)熔喷非织造布,分析了空气压力、接收距离、泵供量等成网工艺参数对产品性能的影响。结果表明:工艺参数对纤网中PBT纤维的形态和结构,对PBT熔喷非织造布的纤维直径、面密度、断裂强力以及孔隙直径都产生了很大的影响。     

熔喷/干法纤网在线复合汽车吸音棉的生产工艺

为了实现熔喷/干法纤网复合汽车吸音棉的在线生产,以开发300 g/m2的复合吸音棉为例,对熔喷工艺、干法纤网工艺以及熔喷/干法纤网在线复合等内容进行了分析介绍。结果表明:采用熔融指数150 g/min的聚丙烯切片,并控制好模头温度、热空气喷射角、热空气压力、接收距离等熔喷工艺参数,采用纤度为3.3 dtex的三维卷曲涤纶中空短纤维和阻燃涤纶短纤维组成的干法纤网,纤网加入熔喷丝的角度在75～83°之间时,能够得到较好的复合吸音棉材料。     

熔喷技术

介绍了熔喷生产工艺及熔喷技术的关键部件——熔喷模头的设计。指出:模头顶点 E 的宽度小于0.508mm,毛细孔直径范围为0.076—0.56mm,气槽 G 的尺寸范围是0.203—0.381mm,阐述了熔喷生产过程中气流速度、气流温度和树脂的流动速度的相互关系,及对熔喷产品质量的影响,并对熔喷技术所用的原料及最终产品的性能和用途作了简要介绍。     

熔喷静电微分纺丝法制备纳米纤维

熔喷静电微分纺丝法是结合熔喷和无针静电纺丝的一种制备纳米纤维的方法,采用自行设计制造的熔喷-电纺喷头,通过改变气流速度和温度,分别采用熔喷、静电纺丝和熔喷-静电纺丝3种方法制备纤维,利用SEM对纤维进行表征,分析了3种纺丝条件对纤维直径和直径分布的影响。结果表明:熔喷法制得的纤维直径较细,但直径分布较宽,而无针静电纺丝法制得的纤维直径较粗,但直径分布窄,熔喷静电微分纺丝法结合了两者的优势,能制得直径小且分布均匀的纤维,最后在控制气流温度为180℃左右,气流速度为30 m/s的情况下,成功制得能够达到平均直径为300 nm的均匀超细纤维,为制备更高要求的过滤、电池隔膜和生物材料等应用方面的材料提供了一种新方法。     

Lyocell熔喷纤维炭膜的吸附性能

采用扫描电镜以及元素分析仪分别对制得的新型Lyocell熔喷纤维炭膜的表面形态结构和C含量进行了分析,并进一步通过甲基橙溶液吸附试验初步探索了该炭纤维膜的吸附性能。结果显示,Lyocell熔喷纤维炭膜的纤维直径较细,孔径较小,网络结构致密;Lyocell熔喷纤维炭膜的优良纤维网络和孔径结构有利于对甲基橙的吸附;此外还发现预氧化膜对甲基橙溶液也有较好的吸附性。     

不同驻极方式下聚丙烯熔喷非织造布的过滤性能

研究了容尘试验前后电驻极、水驻极聚丙烯熔喷非织造布的形貌特征,探讨了在不同试验条件下两种驻极方式的熔喷布对盐性气溶胶颗粒物的过滤效率、气流阻力、透气性等指标的影响。结果表明:相比于电驻极熔喷布,水驻极熔喷布的内部纤维更细、孔隙更多、透气性更好,在同一气体流速下,过滤效率更高、气流阻力更低;随流速增加,两种熔喷布的过滤效率下降,其中水驻极熔喷布下降较少,对应的气流阻力较低;随叠加层数的增加,两种熔喷布的过滤效率和气流阻力同时增大,相同叠加层数下,水驻极熔喷布的气流阻力更低;容尘试验后,过滤效率可达100%,水驻极熔喷布的气流阻力更低,透气性更好。由此可见,相比于电驻极方式,水驻极是一种更优的驻极方式。     

聚乳酸静电纺/熔喷复合纤维膜的制备

用熔喷非织造布设备制备聚乳酸(PLA)熔喷非织造布,并以此作为接收基布,将PLA静电纺纤维喷覆在上面,制得PLA静电纺/熔喷复合纤维膜.对比分析了 PLA熔喷非织造布和静电纺/熔喷复合纤维膜的表观形貌、纤维直径及直径分布,测试了孔径大小及其分布、过滤效率、透气性和力学性能,得出如下结论:PLA静电纺纤维直径分布主要在2...     

半纤维素对玉米秸秆皮Lyocell纤维性能的影响

探讨了半纤维素对Lyocell纤维制备时溶浆过程以及纺丝过程的影响,研究了半纤维素对Lyocell纤维的力学、抗原纤化和染色等性能的影响。试验可知：使用市售质量分数50%的NMMO溶剂在90℃温度下即可完全溶解玉米秸秆皮浆粕;半纤维素含量较高的玉米秸秆皮浆粕的流动性更好,制成的Lyocell纤维的染色性能和抗原纤化性能更好,断裂伸长率较大,结晶度较小。     

冷却方式和超声时间对Lyocell纤维原纤化程度及力学性能的影响

采用超声波震荡法对Lyocell纤维进行处理使其发生原纤化,探讨了冷却方式和超声时间对Lyocell纤维原纤化程度及其力学性能的影响。纤维的表面形态、原纤化指数与保水值结果均表明,随着冷却温度和超声时间的增加,Lyocell纤维的原纤化程度增加。超声处理后Lyocell纤维的力学性能有所下降,在实验范围内,随着冷却温度的升高,Lyocell纤维的力学性能呈下降趋势,但是波动范围较小。当超声时间≤15 min时,超声时间对Lyocell主体纤维力学性能无显著影响。     

The use of crossflow to improve nonwoven melt-blown fibers

A stream of unheated crossflow air has been used to make finer melt-blown fibers. Not only are smaller average fiber diameters obtained, but the variation in fiber diameter is smaller. The use of this technique can allow the production of melt-blown nonwovens, which have finer fibers and more uniform webs. Since unheated air is used in the crossflow jet, the fiber enhancement in terms of finer, stronger fibers can be achieved with an energy savings by substituting unheated crossflow air for a portion of the primary air.     

Effects of Poly(ϵ-caprolactone) on Structure and Properties of Poly(lactic acid)/Poly(ϵ-caprolactone) Meltblown Nonwoven

To obtain flexile poly(lactic acid)-based melt-blown nonwoven filtration material, poly(lactic acid)/poly(?-caprolactone) melt-blown nonwoven with various components were melt-spun by melt-blown processing in the Melt-blown Experiment Line. The 3 wt.% tributyl citrate to poly(?-caprolactone) was added in the composites as compatibilizer. The effect of poly(?-caprolactone) on the structure, morphology, mechanical and filtration properties of poly(lactic acid)/poly(?-caprolactone) melt-blown nonwoven was reported. Scanning electron microscopy micrographs revealed good dispersion of the additive in the fiber webs. The crystallinity of melt-blown webs with poly(?-caprolactone) was more than that of poly(lactic acid) alone. The tensile strength, ductility and air permeability of poly(lactic acid) melt-blown nonwovens were enhanced significantly. The input of poly(?-caprolactone) increased the diameter of fibers and decreased the filtration efficiency of poly(lactic acid)/poly(?-caprolactone) melt-blown nonwoven.     

浅谈熔喷非织造布工艺参数对产品性能的影响

讨论了接收距离、热风速度和温度、工作区温度等工艺参数对熔喷产品拉伸强力、断裂伸长率、过滤效率和过滤阻力等性能的影响,并分析了多重因素的影响,有助于提高产品性能和质量。     

PP/PET混合型熔喷保暖材料的研制

研制了一种PP/PET混合型熔喷保暖材料,采用电子扫描显微镜分析了该熔喷材料的纤网形态结构,并对其透气性、保暖性以及力学性能等进行了测试。结果表明：加入PET纤维之后,材料的纤网空隙增大,其透气性能得到提高;当PET纤维的质量分数为50%时,材料的保温率高达62.47%,强度为6.5 N/5 cm,是一种优良的保暖材料。     

Fabrication of stretchable and high-filtration performance melt-blown nonwoven webs for PM0.3 aerosol filtration

Polypropylene (PP) is a semi-crystalline polymer that displays simple manufacturing, high stiffness, lightweight, chemical resistance, and inexpensive. However, PP has significant drawbacks, such as poor brittleness at low temperatures, high shrinkage ratio, and low impact resistance, which limit its development. Thermoplastic polyurethane (TPU) possesses recyclable and eco-friendly characteristics, along with the elasticity of rubber and exceptional mechanical properties. In this study, a flexible and high-filtration performance PP-TPU textile material was developed by melt-blowing for filtering PM_0.3 aerosols. For the first time, a melt-blown PP-TPU nonwoven was used as an air filter. The fiber morphological studies exhibited that addition of 10 and 20 wt.% TPU into PP resulted in a fiber diameter increment from 0.94 to 1.24 μm. Also, melt-blown PP-TPU forms helical fibers, which are different from fibers noticed in melt-blown PP. Corona-charged double-layer 80PP-20TPU nonwovens have a filtration efficiency of 99.25% and quality factor (QF) of 0.13 mm H₂O⁻¹ at an air flow rate of 95 L/min. Moreover, PP's tensile strength was increased by 72.22%, and elongation was raised by 38.1% with the addition of 20 wt.% TPU. Thus, PP-TPU melt-blown composites may bring novel perspectives into the design and development of high-performance filtering materials for a variety of applications.     

The effect of process parameters on the properties of elastic melt blown nonwovens: Air pressure and DCD

An elastic masterbatch and elastic melt blown nonwovens are prepared based successively on styrene-ethylene/butylene-styrene (SEBS) and polypropylene (PP) blend. The phase separation morphology, rheological properties and crystal structure of the elastic masterbatch are investigated. The results show that a compatible and stable structure is obtained in molten SEBS and PP blend with excellent mobility in the temperature range of 210–230°C. The crystallization of PP slows down resulting in a finer structure due to the restriction of the SEBS network structure with rarely change of crystalline structure. The relationship between process parameters and properties of the elastic nonwoven is also studied in detail. Air pressure and die to collector distance (DCD) have discernible effects on fiber diameter and bonding between fibers, further influencing the performances of nonwovens including porosity, tensile strength and elastic recovery. Elastic recovery is shown to be significantly more affected by DCD than by air pressure.     

Hydro‐entangled bi‐component microfiber nonwovens

This article describes the production of microfiber nonwoven fabrics from segment pie bi‐component fibers using air‐laying and hydro‐entanglement. The bi‐component fibers were split into microfibers during hydro‐entanglement. The microfiber nonwoven fabrics are compared with similar products made from single component fibers. The degree of fiber splitting is found to depend on the jet pressure as well as the fiber position in the web thickness direction. Compared with the nonwovens fabric made from single component fibers, the microfiber nonwoven fabrics have higher tensile strength, lower elongation, higher water absorbency. However, contrary to what was expected, the microfiber nonwovens fabrics have a stiffer handle. This is caused by the increased fiber entanglement and much denser structure for the bi‐component microfiber nonwoven fabrics. POLYM. ENG. SCI., 2009. © 2009 Society of Plastics Engineers     

Influence of processing parameters on fibers diameter and web evenness of polypropylene spunbonding nonwoven fabrics in wide slot positive pressure drafting assembly of spunbonding process

The air drawing model of polymer polypropylene (PP) spunbonding nonwovens has been established. The influences of the density and the specific heat capacity of polymer melt at constant pressure changing with polymer temperature on the fiber diameter have been studied. The air drawing model of polymer in spunbonding is confirmed by the experimental results obtained with our university's equipment. The effects of the processing parameters on fibers web evenness of PP spunbonding nonwoven fabrics in wide slot positive pressure drafting assembly of spunbonding process have also been investigated. The predictions of the filament fiber diameters, crystallinities, and birefringences are coincided well with the experimental data. It is found that a medium polymer melt temperature, monomer suction wind speed, drawing pressure, cross air blow speed, and air control distance have a significant influence on the web evenness and quality, which are beneficial to produce more uniformity fibers web. The experimental results show that the agreement between the results and experimental data is very better, which verifies the reliability of these models. At the same time, the results also reveal the great potential of this research for the computer‐assisted design (CAD) of spunbonding technology. POLYM. ENG. SCI., 58:1268–1277, 2018. © 2017 Society of Plastics Engineers     

Fiber diameter of polybutylene terephthalate melt‐blown nonwovens

A polymer air‐drawing model of Polybutylene Terephthalate (PBT) melt‐blown nonwovens has been established. The predicted fiber diameter coincides with the experimental data. The effects of the processing parameters on the fiber diameter have been investigated. A lower polymer flow rate, a higher initial air velocity, and a larger die‐to‐collector distance can all produce finer fibers, whereas too high an initial air velocity and too large a die‐to‐collector distance contribute little to the polymer drawing of PBT melt‐blown nonwovens. The results show the great potential of this research for the computer‐assisted design of melt‐blowing technology. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 97: 1750–1752, 2005