Effect of Jet Design on Commingling of Glass/Nylon Filaments

Abstract

In this study, a computational fluid dynamics (CFD) model is applied to study the airflow patterns inside the commingling jets, for different configurations. The CFD package, FLUENT 6.1, is used to predict the two-dimensional flow field inside a yarn channel. The parameters viz. velocity profile, pressure gradient, and air particle trajectory, obtained from this CFD analysis give important information for further analysis. The design parameters of commingling jets are related to the flow characteristics and their effect on the structure and properties of Glass/Nylon commingled yarns. The results show that the number of air orifice and the angle of orifice have significant effect on the airflow profile inside the jet and consequently on the structure of the commingled yarns. The jet orifice angle affects the axial velocity. The effect of air pressure is also important, since the nip frequency of commingled yarns is a function of the speed of rotation of the vortex and it is observed that with increase in air pressure, axial and tangential velocities in the nozzle increase. This work shows that, the CFD modeling can be used to optimize nozzle design parameters to develop commingled yarns with better properties.

On-line sensing of the interlacing process

“…• Process parameters Pressure The main key driving force in the process is the airflow velocity, responsible of opening and entangling the filaments. Increasing air pressure, flow velocity increases such as the number of mingle points inserted into the yarn [31]. However, there is a limit to the rate of increase in intermingling.…”

Metal İçerikli Hibrid İplik Üretiminde Eş Karıştırma Yönteminin Kullanımı

“…Bu yöntem ile yapılan çalışmaların büyük çoğunluğu, tekstil takviyeli kompozitlerde kullanılmak üzere üretilen hibrid ipliklerden oluşmaktadır. Bu hibrid ipliklerde cam filamentler ile polyester, nylon ve polipropilen ipliklerin [10,11,12], karbon filamentler ile PEEK (polieter eter keton) ve PPS (polifenilin sülfür) ipliklerin [13,14], keten ile polilaktikasit liflerinin birleştirildiği [15] İplik tüylülüğü, bu cihaza göre birim uzunluk boyunca iplik yüzeyinden dışarı doğru çıkan liflerin sayısı veya lif uzunluğudur. İplik yüzeyinden çıkan 3mm ve üzerindeki uzunluklardaki lif sayılarının toplamını ifade eden "S3", 3 mm altındaki sarkan lif uzunluklarının rahatsız edici olmadığı düşüncesinden hareketle belirlenmiştir.…”

Process–structure relationship of carbon/ polyphenylene sulfide commingled hybrid yarns used for thermoplastic composites

“…Therefore, achieving a uniform distribution of the reinforcement and the thermoplastic fibers in the yarn cross section is one of a major task in the commingling process. The influences of the process parameters on the properties of commingled hybrid yarns were investigated in detail elsewhere [7][8][9]. In Kravaev et al [10,11], detailed study was done to investigate the influence of different process parameters and raw materials on the blending quality.…”