Method to provide multifilament bundles of melt spun polymer filaments
AssigneeAladdin Manufacturing Corporation
InventorAnthony Cascio
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Abstract
A method for providing a multifilament bundle of melt spun polymer filaments that includes providing a spinning device including at least M extruders for melting M polymers, M groups of spinning stations, each group comprising N spinning stations, each spinning station comprising a spin pack coupled to a spin pump which receives molten polymer from one of the M extruders and spins a strand of filaments by pushing said polymer through the coupled spin pack, and N transformation stations for bundling M strands of filaments. The method further includes spinning N*M strands of filaments from the spinning stations at a given spin pump output and bundling the strands into N multifilament bundles via the N transformation stations whereby the spin pump outputs are varied over time.
Claims15
A method for providing a multifilament bundle of melt spun polymer filaments, the method comprising:
- providing a spinning device comprising:
- M extruders for melting M polymers, wherein M>1, and wherein each of the M extruders extrudes at least M streams of its polymer as a molten stream;
- M groups of spinning stations, each group of the M groups of spinning stations comprising N spinning stations, wherein N>1, each of the N*M spinning stations comprising a single spin pump and a single spin pack coupled to the spin pump, where each spin pump of each of the M groups of spinning stations receives the molten stream of polymer from only one of the M extruders, and spins a strand of filaments by pushing said molten stream of polymer through its coupled spin pack so as to form the strand originated from the molten polymer of the respective associated one of the M extruders;
- N transformation stations for bundling M strands of filaments into bundles, wherein each of the N transformation stations is associated with a respective one of the M groups of spinning stations so as to receive only one of the strands of filaments originated from each of the M groups of spinning stations;
- spinning out the N*M strands from the N*M spinning stations at a given spin pump output measured in units of volume per units of time for each of the spin pumps;
- and
- bundling said strands of filaments into N multifilament bundles of melt spun polymer filaments by means of the N transformation stations;
- whereby some or all of the spin pump outputs of the spin pumps are varied over time such that:
- for each of the M groups of spinning stations the sum of the volumes of the spin pump outputs of the N spin pumps varies over time in a range of at most 5% by volume around an average sum of volumes of output of the spin pump of the group of N spinning stations.
A method of providing a multifilament bundle of melt spun polymer filaments, the method comprising:
- providing M extruders, wherein:
- M is an integer greater than 1,
- each of the M extruders is configured to melt a polymer and extrude a stream of molten polymer,
- each of the M extruders is configured to extrude a volume of the stream of molten polymer specific to that extruder over a time interval, and
- a sum of the volumes of streams of molten polymer extruded by all of the M extruders is configured to vary by 5% or less during the time interval;
- providing M groups of spinning stations, wherein:
- each of the M groups of spinning stations is comprised of N spinning stations, and
- N is an integer greater than 1;
- wherein:
- each of the spinning stations is comprised of only one spin pump, where the spin pump is coupled to only one spin pack and to only one of the M extruders and is disposed between its associated spin pack and extruder,
- each of the spin pumps is configured to receive a portion of the stream of molten polymer from its associated extruder, and
- each of the spinning stations is configured to spin one strand of filaments extruded from its associated one spin pack, such that M*N strands configured to form N multifilament bundles are extruded from all of the spin packs in all of the groups of spinning stations;
- and
- wherein each of the spin pumps in each of the groups of spinning stations is configured to vary a volumetric output of an associated one strand of filaments at time periods within the time interval.
Dependencies are inferred from the claim text.