特种纤维气流成网机尘笼结构优化设计分析

为了解决现有气流成网机气流、棉层不均匀等问题,详细介绍了气流成网机构中尘笼的三维构造模型和支撑方式,重点对尘笼表面小孔的几何尺寸进行设计,从确定尘笼内部压力进而建立气流特性参数。指出:设计的特种纤维气流成网机的尘笼结构,能保证气流均匀、成网均匀;建立尘笼结构的空气动力学模型,确定小孔气流速度和临界气流速度的关系以及尘笼结构的最佳小孔数,保证尘笼正常工作。     

再生聚酯/聚丙烯纤维复合板材的制备与研究

以再生聚酯(PET)短纤维和聚丙烯(PP)短纤维为原料,采用针刺法非织造工艺技术制得用于汽车内饰的纤维复合毡,再进行热压成型处理得到纤维复合板材。通过单因子试验研究了原料配比和热压工艺参数对复合板材的拉伸强度和弯曲强度的影响。结果表明:当PET/PP纤维质量混合比为50/50、热压温度为220℃、热压时间为1.5 min、热压压力为4 MPa时,再生PET短纤维/PP短纤维复合板材的力学性能达到最大值。     

气流成网机在汽车内饰生产线中的应用

结合汽车内饰生产线的特点,阐述了气流成网机在汽车内饰生产线中的重要作用,并介绍了其工作原理及工艺特点。     

基于Fluent的气流成网机输送风道流场参数对成网质量的影响

利用软件Fluent对气流成网机输送风道内的三维流场进行数值计算,由仿真模拟的结果分析流场内的速度特征,以期改善气流成网机的成网均匀性.结果表明:斜喂入式和上喂入式两种模型风道中气流场的整体分布基本一致,而上喂入式模型的结构能够使气流吹出时铺满整个工作宽度;在其他参数不变的条件下,随着气流初始速度的增加或入口尺寸的增大,出口处的气流分布逐渐均匀;当上喂入式模型入口尺寸为100mm、初始速度为25m/s时,出口处气流能以14m/s左右的速度稳定均匀地铺满整个工作宽度并呈矩形吹出,使成网更均匀.     

气流成网机在汽车内饰生产线中的应用

结合汽车内饰生产线的特点,阐述了气流成网机在该生产线中的重要作用,并介绍了其工作原理及工艺特点.     

气流成网机的技术研究和改进

论述了气流成网机的工作原理,介绍了在提高气流成网质量方面所进行的研究工作,探讨了改善成网质量和提高产量的途径。     

黄麻汽车内饰衬板的研制

分析黄麻和聚丙烯纤维各自的特性,选用合理的混纺比开发汽车顶棚内饰衬板。探讨了该材料研制过程中的工艺路线及脱胶、阻燃、开松混合、梳理成网、异位对刺固结、热压等主要工艺的技术参数,将生产出的黄麻复合衬板和玻璃增强复合塑料的性能进行了比较,结果表明,用阻燃处理的黄麻纤维与聚丙烯纤维混合开发的非织造汽车内饰衬板材料,其性能指标满足汽车行业的要求,且在顶破强力、延伸性、透气性等方面优于复合塑料。     

气流成网机在汽车内饰生产线中的实际应用

结合汽车内饰生产线的特点，阐述了气流成网机在这种生产线中的重要作用，并介绍了其工作原理及工艺特点。     

热风非织造布工艺技术研究

采用PE/PP双组分纤维,经梳理成网、热风粘合加固后制成蓬松、柔软的非织造布.文章讨论了生产速度、温度和真空度等工艺参数对产品性能的影响.     

气流成网机的技术研究和改进

对气流成网机的工作原理进行了论述 ,介绍了在提高气流成网机的成网质量方面所进行的研究和改进工作 ,深入探讨了改善成网质量和提高产量的途径。     

红麻粉/聚丙烯复合材料性能研究

以聚丙烯(PP)为基体,选用两种红麻粉[包括红麻韧皮粉(KB)、红麻芯秆粉(KS)]分别作为填料,采用双螺杆挤出共混造粒及模压成型方法制备红麻粉/聚丙烯复合材料,测试了复合材料的力学性能并观察其微观结构,分析了KB与KS的含量对复合材料的力学性能的影响,以及采用硅烷偶联剂进行改性处理对红麻粉与聚丙烯基体之间的相容性的影响。结果表明:随着红麻粉含量的增加,复合材料的拉伸性能逐渐下降,弯曲强度则逐渐增加;当红麻粉质量分数达到20%时,KB/PP和KS/PP两种复合材料的弯曲强度都出现最大值,分别为41.33、39.29 MPa;红麻粉质量分数由5%增加到25%,复合材料的拉伸模量和弯曲模量不断增加,冲击强度则出现下降;采用硅烷偶联剂进行改性处理可以有效地改善红麻粉与聚丙烯基体之间的相容性。     

红麻化学机械浆的抄造性能及其成纸印刷适性的研究

分析了红麻化机浆的湿纸幅强度，特别是湿纸幅伸长率的影响因素，并用纤维卷曲指数ＦＣＩ来表现这一影响趋势。建立了湿纸幅综合性能的分析模式──Ａ／Ｓ比概念，并以此来评价红麻化机浆的抄造性能。还根据红麻化机浆的实际应用，对其成纸的印刷适性进行了初步的研究。     

公路护坡生态毯的研制

以废棉纤维、聚丙烯(PP)纤维和麻纤维为原料,采用非织造技术加工成不同结构性能的针刺非织造材料,用作公路护坡生态毯。以纤维配比、层叠结构和针刺密度为因素,以非织造生态毯纵/横向断裂强力、纵/横向断裂伸长率、透水水流量和表面摩擦因数为考核指标,通过正交试验设计方案优选加工工艺,得出最佳工艺组合是A2B3C1。试验结果表明:最佳配比为m(棉)∶m(麻)∶m(PP)=2∶3∶5;最佳结构为棉、PP和黄麻纤维分别单独成网,按黄麻在第一层,PP纤维在中间,棉为基层叠加的三层结构;最佳针刺密度为325刺/cm2。在上述条件下制得的生态毯性能最好,能够满足生态护坡的要求。     

环保型麻地膜的试制

 将非织造布制造工艺与特有的浸渍等后整理工艺相结合,以苎麻、黄麻等麻类纤维为主要试制原料,研究成网方法、固结方法、拒水整理等对环保型麻地膜的影响。结果表明,采用梳理成网与气流成网相结合的成网工艺、使用丙烯酸脂胶乳或醋酸乙烯胶乳为固结剂的化学固结方法,产品表面浸渍有机氟防水剂等组合工艺,试制的麻地膜产品面密度为30~50 g/m2、抗拉强力为629~1 532 N.m、顶破强力为81~203 N、撕破强力为56~82 N、渗透系数为7.79×10-4~1.76×10-3,产品力学性能指标满足使用要求。     

The Hybrid Effect of Jute/Kenaf/E-Glass Woven Fabric Epoxy Composites for Medium Load Applications: Impact,Inter-Laminar Strength,and Failure Surface Characterization

This research has been carried out to find better hybrid natural/glass fiber-reinforced composites for engineering applications. This research work studied the impact and inter-laminar strength of E-glass with jute/kenaf woven fabric epoxy composites with the aim of evaluating the hybridization effects on different laminate stacking sequences made with jute, kenaf, and E-glass fabrics by the vacuum bagging method. All the laminates were prepared in 300 × 300 mm² with a total of five plies maintained at 3 mm thickness, by varying the number and position of jute, kenaf, glass layers so as to obtain nine different stacking sequences. Among them, one group of all pure jute, pure kenaf, and pure E-glass laminates were also fabricated for comparison purpose. The specimen preparation and testing were carried out as per ASTM standards. From the results, it is shown that the properties of jute/kenaf fabrics-reinforced epoxy composites can be enhanced by hybridization with the addition of glass fabrics. The hybridization of jute/kenaf fabrics with E-glass fabrics provides a method to improve the mechanical impact and inter-laminar strength over pure natural fiber-reinforced composites. The hybrid laminate having E-glass and kenaf fiber plies as skin layers and jute fiber plies as core layers showed better properties compared to other laminates.     

Evaluation and Impact Factors of the Mechanical Properties of Phloem Bundle Fibers Obtained from Kenaf Germplasm

The mechanical properties of kenaf phloem bundle fibers are valuable for reinforced composites or boards, more so than similar materials also used in textile or papermaking applications. 55 kenaf germplasm studied here showed an average phloem bundle fiber tensile strength of 643.6 MPa and an average elastic modulus of 23.3 GPa after chemical retting treatment. 19 of these kenaf germplasm had fiber tensile strengths >700 MPa, which can be attributed to intensive breeding programs. The fiber tensile strength and elastic modulus of kenaf germplasm had a significant positive correlation, but there was no such correlation between a fiber’s mechanical properties and its diameter or agronomic characteristics. Among 56 hybridized combination F₁ generations, the highest tensile strength was 928.3 MPa from a combination of No.30 of Xinan Wuchi × Guatemala 4. Therefore, breeding and screening are both useful for improving the mechanical properties of kenaf phloem bundle fibers. However, the effects of the used bundle fiber preparation method or cultivation year on the fiber’s mechanical properties were more pronounced than those of the type of kenaf germplasm or breeding operation used. The mechanical properties of kenaf phloem bundle fibers treated by chemical retting were superior to those treated using natural retting.     

Study on the Application of Kenaf Core as a Composite Reinforcement: Injection Molding of Kenaf Core/Poly(l-lactide) Compounds

Injection molding was performed using poly(l-lactide) (PLLA) as a matrix and by varying the reinforcements, i.e., dry-distilled kenaf core (D-core) or untreated kenaf bast fibers, and the physical properties for these composites were subsequently compared. The dry-distillation was able to reduce the moisture content of D-core by a maximum of 4.2% as compared with untreated control core. As a result, the hydrophobicity was increased, which contributed to favorable Charpy impact strength and tensile properties of the D-core/PLLA composite relative to the kenaf bast fiber/PLLA composite. Moreover, the puffing phenomenon, which arises when heating with a microwave oven due to the vaporization of water dispersed within the interfacial regions and associated softening of the PLLA matrix by the heated vapor, was completely suppressed for the D-core/PLLA composite, whereas a large puffing ratio was observed for the kenaf bast fiber/PLLA composite. Reducing the moisture content also effectively suppressed the occurrence of transesterification reactions, leading to a decrease in the molecular weight of PLLA. However, the apparent nucleation effect of the D-core remains slightly inferior to that for the hydrophilic bast fibers due to its stronger affinity for PLLA molecules.     

Effect of chopped/continuous fiber,coupling agent and fiber ratio on the mechanical properties of injection-molded jute/polypropylene composites

This paper presents the development of jute/polypropylene (PP) composites by twin-screw extrusion and injection molding. Jute/PP was compounded using twin-screw extruder and injection molded. The effects of chopped/continuous fibers, coupling agent and fiber ratio on mechanical properties were investigated. Tensile and flexural moduli of continuous jute/PP were greater than those of chopped fiber/PP. Tensile, flexural and impact strengths were greater in chopped fiber/PP along with elongation at break. Coupling agent improved the tensile and flexural strengths, and these increased with fiber content, whereas impact strength and elongation at break decreased with fiber loading. The results were analyzed using ANOVA and regression analyses.     

碳纤维/聚丙烯/聚乳酸增强复合材料的力学性能

为在不改变碳纤维/聚丙烯(PP)复合材料力学性能前提下,降低复合材料中PP含量以减轻环境降解压力,通过在碳纤维/PP复合材料树脂体系中掺杂可降解的聚乳酸(PLA)形成共混树脂体系,并经热压成型制备碳纤维增强共混树脂复合材料。探究了PLA、PP共混体系质量比对复合材料冲击、弯曲和拉伸性能的影响。结果表明:随着树脂体系中PLA质量分数的增加,复合材料的冲击强度和弯曲强度都呈先降低后升高、再降低的趋势,拉伸强度呈现先升高后降低的趋势;当PLA质量分数为60%时,复合材料的冲击强度和弯曲强度最高,分别为21.8 kJ/m²和112.5 MPa,拉伸强度为37.2 MPa,复合材料的综合物理力学性能最优,与未添加PLA的复合材料的力学性能相近。