Filamentary tow packaging method
AssigneeE. I. Du Pont de Nemours and Company
InventorsGeorge Arvid Fernstrom, James Richard Osborn, Jr.
Life of this patent
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Abstract
A filamentary tow package is prepared in which the tow is in layers of substantially vertical folds and has adjacent layers impacted with one another. Sections of the tow are alternately twisted to give helix angles varying from greater than 45.degree. in an S direction to greater than 45.degree. in a Z direction. The helix angle of the tow is increased by impacting it into layers of tow previously laid down. Removal of tow from the package is improved.
Claims11
A method for delivering an advancing filamentary tow into a container to form a tow package, said method comprising:
- applying alternate twist of varying helix angle to the tow;
- forwarding the alternately twisted tow at a predetermined speed downwardly toward the container;
- moving said container continuously with respect to downwardly moving tow at a speed of from about 1/3 to about 1/20 the forwarding speed of the tow to lay the tow down in layers of substantially vertical folds;
- and
- increasing the varying helix angle applied to the tow by impacting the tow into the layers previously laid down.
In a method for forwarding an advancing filamentary tow into a container to form a tow package, the improvement comprising:
- applying twist of varying helix angle to the advancing tow;
- forwarding the alternately twisted tow at a predetermined speed downwardly toward the container;
- moving said container continuously with respect to downwardly moving tow at a speed of from about 1/3 to 1/20 the forwarding speed of the tow to lay the tow down in layers of substantially vertical folds;
- and
- increasing the varying helix angle applied to the tow upstream of the piddler by impacting the tow into the layers previously laid down.
Dependencies are inferred from the claim text.