Filament breaking length – Experimental and numerical investigations

The tendency of liquid adhesives to draw threads or stretch filaments during manufacturing, a consequence of the visco-elastic properties of all polymer liquids, is a serious issue in industrial bond bonding processes. Description of that phenomenon and identification of influencing parameters have...

Full description

Saved in:
Bibliographic Details
Published in:International journal of adhesion and adhesives 2018-12, Vol.87, p.47-63
Main Authors: Faßbender, Fabian Julius, Fricke, Holger, Mayer, Bernd, Vallée, Till
Format: Article
Language:English
Subjects:
Breaking
C: Rheology
Complexity
Computational fluid dynamics
D: Visco-elasticity
Elastic properties
Filaments
Numerical analysis
Parameter estimation
Parameter identification
Process parameters
Rheological properties
Rheology
Surface tension
Viscoelasticity
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The tendency of liquid adhesives to draw threads or stretch filaments during manufacturing, a consequence of the visco-elastic properties of all polymer liquids, is a serious issue in industrial bond bonding processes. Description of that phenomenon and identification of influencing parameters have not yet matured enough to allow practitioners adjusting adhesives such to minimize filament breaking lengths. Existing approaches are either too general—by focusing on global rheological properties or too complex—thus impossible to implement in industrial processes. The present paper presents and validates an approach that mitigates between simplicity and complexity, and offers practitioners an estimate for filament breaking length. The methodology requires, besides geometrical (dimensions) and process parameters (displacement rates) only basic rheological parameters (density, viscosity, surface tension, flow-index, and phase shift) that can be determined using standard equipment. The approach was first validated on Newtonian resins, extended to non-Newtonian ones, and complemented by validated Computer Fluid Dynamics calculations to extend the range of rheological parameters considered. Finally, a relatively simple estimate for filament breaking length was proposed, which proved accurate if compared to experimental evidence, as differences between predicted and measured values ranged between 1 and 10 %.
ISSN:0143-7496
1879-0127
DOI:10.1016/j.ijadhadh.2018.08.011