Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Filaments, tow, and webs formed by hydraulic spinning










Image Number 7 for United States Patent #5244723.

A method of forming substantially continuous filaments which involves the steps of (1) extending a molten thermoplastic polymer through a die having a plurality of orifices to give a plurality of substantially continuous filaments; (2) quenching the filaments by contacting them with a quenching fluid having a temperature less than that of the filaments and a zero to high imposed velocity which, if other than zero, has a component which is in a direction other than parallel with the movement of filaments; (3) entraining and drawing the filaments in a nozzle with an attenuating liquid having a linear speed of at least about 400 feet/minute; and (4) collecting the drawn filaments. The filaments have an average diameter in the range of from about 5 to about 75 micrometers and a high variability of filament diameter from filament to filament and along the length of any given filament. In addition, at least some of such filaments are present as filament bundles. Such filaments can be collected as tow or can form the basis of a nonwoven web which is characterized by minimal filament-to-filament fusion bonding. The preferred thermoplastic polymers are polyolefins, with the most preferred polyolefin being polypropylene.








 
 
  Recently Added Patents
Intrinsic absorber layer for photovoltaic cells
Online data conversion technique using a sliding window
Decision management system and method
Heteroleptic iridium complexes as dopants
Provision of downlink packet access services to user equipment in spread spectrum communication network
Electronic time stamping apparatus for use with an inground transmitter
User interface for integrating applications on a mobile communication device
  Randomly Featured Patents
Back light for liquid crystal display
Cabinet for electronic data processing equipment
Bag having slider-actuated complementary closure strips and a leakproofing structure
Crop feeding apparatus for rotating concave threshing mechanism
Capacitor element and carbon paste
Internal combustion reciprocating engine
Negative electrode, lithium battery employing the same, and method of preparing the negative electrode
Cord-type grass-cutting head with means for lengthening the worn cord
Sealing fitting with expanding material
Electronic depth perception testing system and apparatus for conducting depth perception tests