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US 2001/0041262 A1Published application
Plastics materials yarn
AssigneePeri-Dent Limited
InventorsIan Roberts, David McKenzie Hill
Life of this patent
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AssigneePeri-Dent Limited
InventorsIan Roberts, David McKenzie Hill
Estimating the term…
A method of converting a plastics material into a yarn in which the plastics material comprises one or more polymers selected from the group consisting of nylon, polyesters, polyethylene, polyvinyl chloride, polyphenylene sulphide, polystyrene. The method comprises heating the material to melt it, pumping the melted material through an extruder to form an extruded filament, and cooling the extruded filament. The cooled filament is passed through a first draw roller assembly while elevating the temperature of the filament. The filament is then heated in a heating zone as it exits the first draw roller assembly and, thereafter, the filament is passed through a second draw roller assembly operating at a different linear speed to the first draw roller assembly. The filament is spooled after exiting the second draw roller assembly.
A method of converting a plastics material into a yarn, the plastics material comprising one or more polymers selected from the group consisting of nylon, polyesters, polyethylene, polyvinyl chloride, polyphenylene sulphide, polystyrene, the method comprising heating the material to melt it, pumping melted material through an extruder to form an extruded filament, cooling the extruded filament, passing the extruded filament through a first draw roller assembly while elevating the temperature of the filament, heating the filament in a heating zone as it exits from the first draw roller assembly and, thereafter, passing the filament through a second draw roller assembly operating at a different linear speed to the first draw roller assembly and spooling the filament exiting the second draw roller assembly.
A plastics material yarn having a width in the range of substantially 0.5 to substantially 4 mm, and a decitex in the range of substantially 400 to substantially 1500, wherein the plastics material comprises a polymer selected from the group consisting of nylon, polyesters, polyethylene, polyvinyl chloride, polyphenylene sulphide, polystyrene.
Apparatus for converting a plastics material into a yarn, the apparatus comprising means for melting the material, means for pumping melted material through an extrusion die to form an extruded filament, means for cooling the extruded filament, a first draw roller assembly to draw the extruded filament therethrough, heating means to heat at least one of the rollers of said first draw roller assembly, a heating zone arranged at the exit of the first draw roller assembly to heat the extruded filament exiting from said first draw roller assembly, a second draw roller assembly operating at a different linear speed to the first draw roller assembly, and spooling means for spooling the filament exiting from the second draw roller assembly.
Dependencies are inferred from the claim text.