SYSTEMS AND METHODS FOR MANUFACTURING BULKED CONTINUOUS FILAMENT
First Claim
1. A method of manufacturing PET nurdles, said method comprising:
- providing a multi-screw extruder that comprises;
(i) a first satellite screw extruder, said first satellite screw extruder comprising a first satellite screw that is mounted to rotate about a central axis of said first satellite screw;
(ii) a second satellite screw extruder, said second satellite screw extruder comprising a second satellite screw that is mounted to rotate about a central axis of said second satellite screw; and
(iii) a pressure regulation system that is adapted to maintain a pressure within said first and second satellite screw extruders below about 18 millibars;
using said pressure regulation system to reduce a pressure within said first and second satellite screw extruders to below about 18 millibars;
while maintaining said pressure within said first and second satellite screw extruders below about 18 millibars, passing a melt comprising recycled polymer through said multi-screw extruder so that;
(1) a first portion of said melt passes through said first satellite screw extruder, and (2) a second portion of said melt passes through said second satellite screw extruder;
after said step of passing said melt of recycled polymer through said multi-screw extruder, pelletizing said polymer melt into a plurality of polymer nurdles.
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Accused Products
Abstract
A method of recycling PET into PET nurdles, comprises: (A) grinding recycled PET bottles into a group of flakes; (B) washing the flakes; (C) identifying and removing impurities, including impure flakes, from the group of flakes; (D) passing the group of flakes through an MRS extruder while maintaining the pressure within the MRS portion of the MRS extruder below about 18 millibars; (E) passing the resulting polymer melt through at least one filter having a micron rating of less than about 50 microns; and (F) forming the recycled polymer into PET nurdles. In various embodiments, the polymer melt is formed into PET nurdles using any suitable technique such as, for example, any suitable strand pelletizing or melt pelletizing techniques.
37 Citations
21 Claims
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1. A method of manufacturing PET nurdles, said method comprising:
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providing a multi-screw extruder that comprises; (i) a first satellite screw extruder, said first satellite screw extruder comprising a first satellite screw that is mounted to rotate about a central axis of said first satellite screw; (ii) a second satellite screw extruder, said second satellite screw extruder comprising a second satellite screw that is mounted to rotate about a central axis of said second satellite screw; and (iii) a pressure regulation system that is adapted to maintain a pressure within said first and second satellite screw extruders below about 18 millibars; using said pressure regulation system to reduce a pressure within said first and second satellite screw extruders to below about 18 millibars; while maintaining said pressure within said first and second satellite screw extruders below about 18 millibars, passing a melt comprising recycled polymer through said multi-screw extruder so that;
(1) a first portion of said melt passes through said first satellite screw extruder, and (2) a second portion of said melt passes through said second satellite screw extruder;after said step of passing said melt of recycled polymer through said multi-screw extruder, pelletizing said polymer melt into a plurality of polymer nurdles. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of manufacturing PET nurdles comprising the steps of:
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grinding a plurality of recycled PET bottles into a group of polymer flakes; washing said group of polymer flakes to remove at least a portion of one or more contaminants from a surface of said flakes, said group of flakes comprising a first plurality of flakes that consist essentially of PET and a second plurality of flakes that do not consist essentially of PET; after said step of washing said first plurality of flakes; (i) scanning said washed group of flakes to identify said second plurality of flakes, (ii) separating said second plurality of flakes from said first plurality of flakes; melting said second plurality of flakes to produce a polymer melt; providing an extruder that extrudes material in a plurality of different extrusion streams; reducing a pressure within said extruder to between about 0 millibars and about 25 millibars; while maintaining said pressure within said extruder between about 0 millibars and about 25 millibars, passing said polymer melt through said extruder so that said polymer melt is divided into a plurality of extrusion streams, each having a pressure between about 0 millibars and about 25 millibars; after passing said polymer melt through said extruder, filtering said polymer melt through at least one filter; and after passing said polymer melt through said filter, pelletizing said polymer melt to form a plurality of PET nurdles. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method of manufacturing PET nurdles from recycled PET, said method comprising:
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(A) melting a plurality of flakes consisting essentially of recycled PET to form a polymer melt; (B) providing a multi-screw extruder that comprises; (i) a first satellite screw extruder, said first satellite screw extruder comprising a first satellite screw that is mounted to rotate about a central axis of said first satellite screw; (ii) a second satellite screw extruder, said second satellite screw extruder comprising a second satellite screw that is mounted to rotate about a central axis of said second satellite screw; (iii) a third satellite screw extruder, said third satellite screw extruder comprising a third satellite screw that is mounted to rotate about a central axis of said third satellite screw; (iv) a fourth satellite screw extruder, said fourth satellite screw extruder comprising a fourth satellite screw that is mounted to rotate about a central axis of said fourth satellite screw; and (v) a pressure regulation system that is adapted to maintain a pressure within said first, second, third, and fourth satellite screw extruders between about 0 millibars and about 5 millibars; (C) using said pressure regulation system to reduce a pressure within said first, second, third, and fourth satellite screw extruders to between about 0 millibars and about 5 millibars; (D) while maintaining said pressure within said first, second, third, and fourth satellite screw extruders between about 0 millibars and about 5 millibars, passing a melt comprising recycled polymer through said multi-screw extruder so that;
(1) a first portion of said melt passes through said first satellite screw extruder, (2) a second portion of said melt passes through said second satellite screw extruder, (3) a third portion of said melt passes through said third satellite screw extruder, and (4) a fourth portion of said melt passes through said fourth satellite screw extruder; and(E) after said step of passing said polymer melt through said multi-screw extruder, forming said polymer melt into a plurality of PET nurdles. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification