Process for improving electrostatic charging of plexifilaments

This invention relates to electrostatic charging of flash spun polymer plexifilamentary film-fibril strands which have been spread apart to separate the fibrils, and wherein the electrostatic charging further separates the fibrils and helps to pin the strands down to a moving conveyor. The efficienc...

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Bibliographic Details
Main Authors McGinty, David Jackson, Powers, Jr., Ervin Townsend, Shin, Hyunkook, Siemionko, Roger Keith, Taylor, David Martin
Format Patent
LanguageEnglish
Published 24.09.2002
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Summary:This invention relates to electrostatic charging of flash spun polymer plexifilamentary film-fibril strands which have been spread apart to separate the fibrils, and wherein the electrostatic charging further separates the fibrils and helps to pin the strands down to a moving conveyor. The efficiency of electrostatic charging of polyolefin web in a process for flash-spinning polyolefin plexifilament from solution in a C-Chydrocarbon, forming the plexifilament into a web, electrostatically charging the web, and laying the web down as a sheet is improved by having present in the electrostatic charging step environment a charge-improving compound, which can be any one of a number of specifically identified classes of charge-improving compounds. The charge improving compounds are present in an amount of at least 0.1 ppm of the atmosphere in that environment or more.