Continuous curing and post-curing method
A method of continuous curing and post-curing of a plurality of extruded strands is provided. A plurality of extruded strands is wrapped through a plurality of spindle units rotatably connected to a rigid frame structure. A plurality of dual spindles are provided in a plurality of upper and lower spindle units, wherein each dual spindle comprises a free spinning roller and a driven roller. A chamber that comprises a dual function chamber configured for heating and cooling is supported on the rigid frame structure. The plurality of extruded strands is continuously transferred between the upper spindle units and the lower spindle units such that the plurality of extruded strands runs in a vertical fashion that continuously alternates between the lower spindle units and the upper spindle units. Each of the plurality of strands is transferred independently of each other and continuously passed through the chamber for continuous curing and post-curing.
1. A method of continuous curing and post-curing of a plurality of extruded strands, the method comprising the steps of:
wrapping multiple lines of a plurality of extruded strands through a plurality of spindle units rotatably connected to a rigid frame structure comprising:
a plurality of interconnected rigid frame members, and the rigid frame structure comprises a top portion and a bottom portion;
a rigid top plate member;
a rigid bottom plate member;
a plurality of upper spindle units rotatably attached to the rigid top plate member;
a plurality of lower spindle units rotatably attached to the rigid bottom plate member;
a plurality of dual spindles provided in a plurality of upper spindle units and a plurality of lower spindle units, wherein each dual spindle comprises a free spinning roller and a driven roller, and arranged in the plurality of upper spindle units and the plurality of lower spindle units such that a next dual spindle has a configuration opposite a prior dual spindle, wherein the multiple lines of the plurality of extruded strands are wrapped around the free spinning roller and the driven roller of the plurality of dual spindles; the free spinning roller and the driven roller are adapted to rotate in an opposite configuration allowing the multiple lines of the plurality of extruded strands to run at a spate speed;
a chamber supported on the rigid frame structure, the chamber comprises a dual function chamber configured for heating and cooling;
transferring continuously the plurality of extruded strands between the plurality of upper spindle units and the plurality of lower spindle units such that the plurality of extruded strands runs in a vertical fashion that continuously alternates between the plurality of lower spindle units and the plurality of upper spindle units, such that each of the plurality of the lower spindle units positioned on the rigid bottom plate member aligns vertically with each of the plurality of upper spindle units so as to allow extrudate to string up in a vertical fashion where at the end of each vertical length the extrudate wraps around the driven roller or free spinning roller and runs parallel to the extrudate next to it and wraps around the next dual spindle and continues such arrangement in series;
passing continuously the plurality of extruded strands through the dual function chamber for continuous curing and post-curing; operating independently each of the drive motors to independently control a transfer rate for each of the plurality of extruded strands; and
controlling a speed of the plurality of drive motors by a controller to allow the plurality of extruded strands to remain in heat or cool selectively exerted by the dual function chamber for a predetermined period of time.
2. The method of claim 1 , further comprising:
transferring the plurality of extruded strands around an adjacent spindle unit in a serial manner to facilitate curing continuously a substantial amount of length of the plurality of extruded strands.
3. The method of claim 1 , wherein passing continuously the plurality of extruded strands further comprises:
continuous curing and post-curing of the plurality of extruded strands by a heating process step or by forced air convection as the plurality of extruded strands passes through the dual function chamber.
4. The method of claim 1 , wherein passing continuously the plurality of extruded strands further comprises:
continuous curing and post-curing of the plurality of extruded strands by a cooling process step or by a plurality of heat-exchange cons and closed loop refrigeration as the plurality of extruded strands passes through the dual function chamber.
5. The method of claim 1 , further comprising:
dehumidifying the plurality of extruded strands by passing a low dew-point air into the dual function chamber as the plurality of extruded strands passes through the dual function chamber.
6. The method of claim 1 , further comprising:
passing a first line of the plurality of extruded strands at a first rate of speed and passing a second line of the plurality of extruded strands at a second rate of speed.
7. The method of claim 6 , wherein the first rate of speed and the second rate of speed are selected independently of each other.
8. The method of claim 6 , wherein the first rate of speed is based on characteristics of the first line of the plurality of extruded strands and the second rate of speed is based on characteristics of the second line of the plurality of extruded strands.
9. The method of claim 1 , further comprising:
operating a plurality of drive motors, wherein each of the plurality of drive motors is operated independently of the other to pass each of the plurality of extruded strands at a different rate of speed.