scholarly journals Fiber Motion near the Collector during Melt Blowing Part 1: General Considerations

2002 ◽  
Vol os-11 (2) ◽  
pp. 1558925002OS-01
Author(s):  
Randall R. Bresee
Keyword(s):  
Fiber Orientation ◽  
Flow Direction ◽  
Melt Blowing ◽  
Web Structure ◽  
Fiber Motion ◽  
On Line

We conducted numerous experiments to achieve greater understanding of multi-hole melt blowing at commercial speed. On-line measurements acquired near the collector and off-line measurements of web structure allowed us to better understand fiber speed, fiber flow direction, fiber orientation and fiber entanglement during melt blowing.

scholarly journals Fiber Motion near the Collector during Melt Blowing: Part 2 — Fly Formation

2002 ◽  
Vol os-11 (3) ◽  
pp. 1558925002OS-01 ◽  
Author(s):  
Randall R. Bresee ◽  
Uzair A. Qureshi
Keyword(s):  
Processing Parameters ◽  
Experimental Measurements ◽  
Melt Blowing ◽  
Fiber Motion ◽  
On Line

On-line and off-line measurements were obtained to gain an understanding of fly production during multi-hole melt blowing at commercial speed. These measurements allowed us to describe the effects of common processing parameters on fly production and develop a model for fly formation that begins to account for experimental measurements.

scholarly journals Probabilistic Model Development of Web Structure Formation in the Melt Blowing Process

2004 ◽  
Vol os-13 (3) ◽  
pp. 1558925004os-13
Author(s):  
Rajeev Chhabra ◽  
Robert L. Shambaugh
Keyword(s):  
Structure Formation ◽  
Model Development ◽  
Lateral Spread ◽  
Melt Blowing ◽  
Single Filament ◽  
Structural Formation ◽  
Web Structure ◽  
Fiber Motion ◽  
Probabilistic Space ◽  
The Web

A probabilistic modeling approach has been proposed to correlate motion of a filament to the web structural formation in single filament melt blowing. By treating fiber motion as a Markov process, a probabilistic space has been determined where fiber has a greatest chance of being present in the web structure and in its flight to the collection system. Based on the positional probabilities, a single fiber's motion space has been determined to be correlated to its diameter. Experimental data show that any process or material variable that leads to a variation in fiber diameter affects the lateral spread of fiber motion, and thereby web structure formation in a single filament melt blowing process.

On-line Measurement of Fiber Motion During Melt Blowing

2007 ◽  
Vol 46 (22) ◽  
pp. 7340-7352 ◽  
Author(s):  
Jessica H. Beard ◽  
Robert L. Shambaugh ◽  
Brent R. Shambaugh ◽  
David W. Schmidtke
Keyword(s):  
Melt Blowing ◽  
Fiber Motion ◽  
Line Measurement ◽  
On Line

Development of On-line Fiber Orientation Meter Based on the Light Guide Effect

2004 ◽  
Vol 58 (2) ◽  
pp. 220-225
Author(s):  
Yuji Abe ◽  
Hidenobu Todoroki
Keyword(s):  
Fiber Orientation ◽  
Light Guide ◽  
On Line

Development of the layered structure in a double-gated glass fiber-reinforced polypropylene injection molding: Experimental and simulated results

2018 ◽  
Vol 37 (14) ◽  
pp. 945-959 ◽  
Author(s):  
MC Quintana ◽  
MP Frontini
Keyword(s):  
Glass Fiber ◽  
Layered Structure ◽  
Fiber Orientation ◽  
Flow Direction ◽  
Weld Line ◽  
Orientation Distribution ◽  
Simulation Software ◽  
Distribution Data ◽  
Melt Temperature ◽  
Fiber Orientation Distribution

The present study aims to experimentally validate numerical simulation of fiber orientation distribution performed by molding simulation software Moldex3D in a double-gated injection-molded glass fiber-filled (40 wt%) polypropylene box, by making a detailed comparison of predicted and experimentally measured fiber orientation distribution data. The modeling approach evaluated in this work consists in the implementation of the Folgar–Tucker rotary diffusion model with the invariant-based optimal fitting closure approximation for the fourth-order orientation tensor. The specimen used has a weld line in the center and sharp corners. This investigation characterizes in detail the development of the through-thickness layered structure at distinctive locations of the specimen. The sensitivity of fiber orientation distribution and the layered structure to changes upon injection time and melt temperature is also evaluated. The boxes display the typical layered laminate structure, with fibers aligned in the main flow direction near the walls (shell layer) and less oriented in the middle plane (core layer). The boxes injected at the lowest melt temperature display an additional skin layer. Unfortunately, simulation fails in predicting the five layers structure developed under these latter conditions. The grade of fiber orientation is deemed to be independent of process parameters but not the layered structure.

Study on airflow field and fiber motion with new melt blowing die

2019 ◽  
Vol 59 (6) ◽  
pp. 1182-1189 ◽  
Author(s):  
Wanli Han ◽  
Sheng Xie ◽  
Jing Shi ◽  
Xinhou Wang
Keyword(s):  
Melt Blowing ◽  
Fiber Motion ◽  
Airflow Field

scholarly journals Polyether Based Thermoplastic Polyurethane Melt Blown Nonwovens

2006 ◽  
Vol 1 (1) ◽  
pp. 155892500600100 ◽  
Author(s):  
Terezie Zapletalova ◽  
Stephen Michielsen ◽  
Behnam Pourdeyhimi
Keyword(s):  
Fiber Orientation ◽  
Thermoplastic Polyurethane ◽  
Strong Relationship ◽  
Thermoplastic Elastomers ◽  
Distribution Functions ◽  
Structure Property ◽  
Melt Blowing ◽  
Polyurethane Elastomers ◽  
Fiber Orientation Distribution ◽  
The Web

A series of melt blown samples were produced from three hardness grades of ether based thermoplastic polyurethane elastomers (TPU). The fabrics were tested to investigate their structure-property relationship in a melt blown process. Solution viscosities of the web were only 20–26% of there original values indicating a large loss in polymer molecular weight during melt blowing. Fiber diameter distributions measured on melt blown samples were found comparable to those made with more conventional polymers. The fiber orientation distribution functions (ODF) suggest slight fiber orientation in machine direction. Tensile and elongation properties depended on die-to-collector distance (DCD), polymer hardness and fiber ODF. A strong relationship between the tensile strength and die-to-collector distance was identified and attributed to reduced interfiber adhesion in the web with increasing DCD. The reduction in adhesion was attributed to greater extents of solidification before reaching the forming belt for longer DCDs. This paper is the first in a series relating the influence of the melt blowing process parameters on the polymer properties and the nonwoven fabric properties for block thermoplastic elastomers.

scholarly journals Investigation on the Fiber Orientation Distributions and Their Influence on the Mechanical Property of the Co-Injection Molding Products

Polymers ◽  
2019 ◽  
Vol 12 (1) ◽  
pp. 24
Author(s):  
Chao-Tsai Huang ◽  
Xuan-Wei Chen ◽  
Wei-Wen Fu
Keyword(s):  
Injection Molding ◽  
Tensile Properties ◽  
Fiber Orientation ◽  
Flow Direction ◽  
Rapid Development ◽  
Injection System ◽  
Single Shot ◽  
Fiber Morphology ◽  
Orientation Tensor ◽  
Orientation Distributions

In recent years, due to the rapid development of industrial lightweight technology, composite materials based on fiber reinforced plastics (FRP) have been widely used in the industry. However, the environmental impact of the FRPs is higher each year. To overcome this impact, co-injection molding could be one of the good solutions. But how to make the suitable control on the skin/core ratio and how to manage the glass fiber orientation features are still significant challenges. In this study, we have applied both computer-aided engineering (CAE) simulation and experimental methods to investigate the fiber feature in a co-injection system. Specifically, the fiber orientation distributions and their influence on the tensile properties for the single-shot and co-injection molding have been discovered. Results show that based on the 60:40 of skin/core ratio and same materials, the tensile properties of the co-injection system, including tensile stress and modulus, are a little weaker than that of the single-shot system. This is due to the overall fiber orientation tensor at flow direction (A11) of the co-injection system being lower than that of the single-shot system. Moreover, to discover and verify the influence of the fiber orientation features, the fiber orientation distributions (FOD) of both the co-injection and single-shot systems have been observed using micro-computerized tomography (μ-CT) technology to scan the internal structures. The scanned images were further utilizing Avizo software to perform image analyses to rebuild the fiber structure. Specifically, the fiber orientation tensor at flow direction (A11) of the co-injection system is about 89% of that of the single-shot system in the testing conditions. This is because the co-injection part has lower tensile properties. Furthermore, the difference of the fiber orientation tensor at flow direction (A11) between the co-injection and the single-shot systems is further verified based on the fiber morphology of the μ-CT scanned image. The observed result is consistent with that of the FOD estimation using μ-CT scan plus image analysis.

Numerical approach to modeling fiber motion during melt blowing

2010 ◽  
Vol 119 (4) ◽  
pp. 2112-2123 ◽  
Author(s):  
Y. C. Zeng ◽  
Y. F. Sun ◽  
X. H. Wang
Keyword(s):  
Numerical Approach ◽  
Melt Blowing ◽  
Fiber Motion
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