Improved Sheath/Core Adhesion in Biconstituent Fibers via Interface Mixing
1980
Southern, John H. | Martin, Donald H. | Baird, Donald G.
Biconstituent melt-flow through a porous unit, known as the Interface Mixer Insert, is used to achieve adhesion within sheath/core fibers spun from two incompatible polymers, as exemplified herein by nylon and polyester. Sheath splitting and void formation at the interface are documented for nylon sheath/polyester core filaments having essentially no adhesion between the sheath and the core. Improved adhesion as a function of Interface Mixer Insert filtration media is examined via optical and electron microscopy and correlated with a qualitative fabric-endurance evaluation as well as a quantitative adhesion-peel-strength test.
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