Non-woven fabric and method and apparatus for making the same
AssigneesNippon Petrochemicals Company, Limited, Polymer Processing Research Inst., Ltd.
InventorsKazuhiko Kurihara, Shigezou Kojima, Hiroshi Yazawa, Toshikazu Oishi
Life of this patent
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Abstract
A non-woven fabric is characterized by including a filament layer in which one or more continuous filaments composed of a polymeric material are spirally collected substantially along a shape obtained by offsetting an ellipse having an elongated major axis in a plane. This non-woven fabric can be obtained by spinning a filament composed of a polymeric material, vibrating the filament, amplifying vibration of the filament, and collecting the filament into an elliptic shape having an elongated major axis so that the filament is arranged in a direction of the major axis.
Claims17
A method of making a non-woven fabric comprising the steps of:
- spinning a filament composed of polymeric material;
- vibrating said filament;
- amplifying the vibration of said filament in a predetermined first axis direction whereby the filament is scattered, the scattered filament depicting an ellipse having a elongated major axis as a locus in its cross section every one cycle of the vibration, the direction of the major axis corresponding to the first axis;
- the amplifying step being started at a point other than the starting point of the filament vibration step;
- and
- collecting the scattered filaments into a series of ellipses so that the major axis of each ellipse deviates from the immediately adjacent ellipse in a predetermined second axis direction crossing the first axis and the major axes of said ellipses are arranged substantially in parallel.
A method of making a non-woven fabric comprising the steps of:
- spinning a filament composed of a polymeric material;
- vibrating said filament;
- amplifying the vibration of said filament;
- collecting said filament into an elliptic shape having an elongated major axis and arranging said filament in the direction of substantially the major axis,
- wherein said filament vibration amplifying step comprises continuously striking a pair of fluid flows jetting in directions opposite to one another on the substantial center of vibration of the vibrating filament to direct the fluid flows in a direction perpendicular to the jetting direction of the fluid flows, such that the amplitude of the vibrating filament is amplified in said perpendicular direction and wherein in said filament vibration amplifying step, the amplification of vibration of the vibrating filament starts at a point other than the starting point of the filament vibration in the step of vibrating the filament and said filament vibration amplifying step comprises discontinously amplifying the amplitude of the vibrating element.
A method of making a non-woven fabric comprising the steps of:
- spinning a filament composed of polymeric material;
- vibrating said filament;
- amplifying the vibration of said filament;
- collecting said filament into an elliptic shape having an elongated major axis and arranging said filament in the direction of substantially the major axis,
- wherein said filament vibration amplifying step comprises continuously crossing a pair of fluid flows jetting in directions opposite to each other within a vibration range of said filament without striking the fluid flows whereby the vibrating filament is blown away in the direction of one of the fluid flows when the filament crosses one of the fluid flows and the vibrating filament is blown away in the direction of the other fluid flow when the filament crosses the other fluid flow, whereby the direction of vibration of said filament is directed in the direction parallel to the jetting direction of the fluid flows and the vibration is amplified and wherein in said filament vibration amplifying step, the amplification of vibration of the vibrating filament starts at a point other than the filament vibration starting point of the step of vibrating the filament, said filament vibration amplifying step comprises discontinously amplifying the amplitude of the vibrating filament.
A method of making a non-woven fabric comprising the steps of:
- spinning a filament composed of a polymeric material;
- vibrating said filament;
- amplifying the vibration of said filament, the amplifying step being started at a point other than the starting point of the filament vibration step;
- collecting said filament into an elliptic shape having an elongated major axis and arranging said filament in the direction of substantially the major axis,
- wherein said filament vibration amplifying step comprises continuously striking a pair of fluid flows on the substantial center of vibration of the vibrating filament to direct the fluid flows in a direction perpendicular to a jetting direction of the fluid flows, whereby the amplitude of the vibrating filament is amplified in the perpendicular direction.
Dependencies are inferred from the claim text.