Apparatus and process for spinning polymeric filaments
AssigneeE. I. Du Pont de Nemours and Company
InventorsYoung D. T. Nguyen, Hans R. Frankfort, Gregory Eugene Sweet, George Vassilatos
Life of this patent
Estimating the term…
Abstract
A melt spinning apparatus for spinning continuous polymeric filaments including a first stage gas inlet chamber adapted to be located below a spinneret and optionally a second stage gas inlet chamber located below the first stage gas inlet chamber. The gas inlet chambers supply gas to the filaments to control the temperature of the filaments. The melt spinning apparatus also includes a tube located below the second stage gas inlet chamber for surrounding the filaments as they cool. The tube may include an interior wall having a converging section, optionally followed by a diverging section.
Claims20
A melt spinning apparatus for spinning continuous polymeric filaments, comprising:
- a first stage gas inlet chamber adapted to be located below a spinneret and a second stage gas inlet chamber located below the first stage gas inlet chamber wherein the first and second stage gas inlet chambers supply gas to the filaments to control temperature of the filaments;
- and
- a tube located below the second stage gas inlet chamber for surrounding the filaments as they cool, the tube including an interior wall having a converging section, followed by a diverging section.
A melt spinning apparatus for spinning continuous polymeric filaments, comprising:
- a housing adapted to be located below a spinneret;
- a first stage chamber and a second stage chamber, each formed in an inner wall of the housing;
- a first stage gas inlet for supplying gas to the first stage chamber;
- a second stage gas inlet for supplying gas to the second stage chamber;
- a wall attached to the inner wall at a lower portion of the first stage chamber to separate the first stage chamber from the second stage chamber;
- a quench screen centrally positioned in the first stage chamber, wherein the apparatus is adapted such that pressurized gas is blown inwardly from the first stage gas inlet through the first stage chamber into a zone formed in the interior wall of the quench screen;
- an inner wall disposed below the quench screen and between the first stage gas inlet and the second stage gas inlet;
- a first stage converging section formed in the interior of the inner wall;
- a perforated tube disposed below the first stage converging section and between the first stage gas inlet and the second stage gas inlet, the perforated tube being located centrally within the second stage chamber;
- an inner wall located below the perforated tube;
- a tube located in the interior of the inner wall, the tube including an interior wall surface having a second stage converging section located within the second stage chamber, and a diverging section located at the exit of the second stage chamber;
- and
- optionally a converging cone having perforated walls located at the exit of the tube.
A melt spinning process for spinning continuous polymeric filaments, comprising:
- passing a heated polymeric melt in a spinneret to form filaments;
- providing a gas to the filaments from a gas inlet chamber located below the spinneret in a first stage;
- providing a gas to the filaments from a gas inlet chamber in a second stage;
- passing the filaments to a tube located below the gas inlet chambers, wherein said tube comprises an interior wall having a first converging section;
- and
- passing the filaments through the tube.
A melt spinning apparatus for spinning continuous polymeric filaments, comprising:
- a tube to surround the filaments, wherein the tube includes a diverging section following a converging section;
- two or more gas inlet chambers adapted to be located below a spinneret and which supply gas to the filaments to control the temperature of the filaments and further comprising at least one exhaust stage adapted to remove air from the apparatus.
A melt spinning apparatus for spinning continuous polymeric filaments, comprising:
- a tube to surround the filaments;
- two or more gas inlet chambers adapted to be located below a spinneret and which supply gas to the filaments to control the temperature of the filaments and further comprising at least one exhaust stage adapted to remove air from the apparatus;
- a converging section in the tube located below at least one of the gas inlet chambers.
A melt spinning process for spinning continuous polymeric filaments, comprising:
- passing a heated polymeric melt in a spinneret to form filaments;
- providing a gas to the filaments from a gas inlet chamber located below the spinneret in a first stage, wherein said gas is supplied to said gas inlet chamber from a superatmospheric supply;
- providing a means for gas to vent from at least one gas exhaust chamber located below the first stage;
- passing the filaments through a tube located below the gas inlet chamber, wherein said tube comprises an interior wall having a first converging section that increases air speed;
- and
- allowing the filaments to exit the tube.
A melt spinning process for spinning continuous polymeric filaments, comprising:
- passing a heated polymeric melt in a spinneret to form filaments;
- providing a gas to the filaments from a gas inlet chamber located below the spinneret in a first stage chamber;
- providing a means for gas to vent from at least one gas exhaust chamber located below the first stage in a second stage chamber;
- providing a gas to the filaments from a gas inlet chamber in a third stage chamber, wherein said gas is supplied to said gas inlet chamber from a superatmospheric supply;
- passing the filaments through a tube located below the gas inlet chamber, wherein said tube comprises an interior wall having a first converging section that increases air speed;
- and
- allowing the filaments to exit the tube.
A melt spinning apparatus for spinning continuous polymeric filaments, comprising:
- a tube for surrounding the filaments;
- one or more gas inlets adapted to be located below a spinneret, at least one inlet including means to supply gas to the filaments above atmospheric pressure to control temperature of the filaments;
- and
- a vacuum exhaust to remove gas,
- wherein at least one inlet supplies ambient air, wherein the ambient air is pulled in by the gas above atmospheric pressure.
A melt spinning apparatus for spinning continuous polymeric filaments, comprising:
- a housing adapted to be located below a spinneret;
- a first stage chamber, a second stage chamber, and a third stage chamber each formed in an inner wall of the housing;
- a first stage gas inlet for supplying gas to the first stage chamber;
- a second stage gas inlet for supplying or exhausting gas to or from the second stage chamber;
- a third stage gas inlet for supplying gas to the third stage chamber;
- and
- a converging section in at least one of the stages or after the third stage, for accelerating gas.
A melt spinning apparatus for spinning continuous polymeric filament, comprising
- two or more gas inlet chambers adapted to be located below a spinneret and which supply gas to the filaments to control the temperature of the filaments;
- at least one gas inlet for supplying gas to one or more of the inlet chambers;
- at least one perforated annular plate separating the inlet chambers;
- and
- a tube for surrounding the filaments as they cool, the tube including an interior wall having a converging section, optionally followed by a diverging section.
A melt spinning apparatus for spinning continuous polymeric filament, comprising:
- a tube for surrounding filaments;
- two or more gas inlets;
- means to introduce superatmospheric gas to at least one inlet;
- and
- means to introduce ambient air to at least one inlet.
Dependencies are inferred from the claim text.