Peri-dent Limited

Peri-deat Limited

Ian Roberts

Ira D Hill

Dale G Brown

David Barlow

James McKenzie Hill

David McKenzie Hill

David MacKenzie Hill

James Mckenzie Hill

Molecularly oriented, thermoplastic elastomeric dental tapes extruded with a melt spinning extrusion carried out at draw ratios from between about 4:1 and about 7.5:1 and draw temperatures from between about 80&deg; and 265&deg; C. having: elongation at break of less than about 50%, an elastic limit of less than about 25% and enhanced tape flex-twist index from between about 2.5 and about 5, with the capacity to release substantive, flake-free, saliva soluble coatings during flossing.

Elastomeric monofilament dental tapes

A method of converting a plastics material into a yarn, in which the plastics material includes one or more polymers selected from the group consisting of nylon, polyesters, polyethylene, polyvinyl chloride, polyphenylene sulphide, polystyrene. The method includes 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.

Process of making a yarn

A method of converting a plastics material into a yarn includes heating the material to melt it and pumping the melted material through an extrusion die (,) to form an extruded filament (,). The extruded filament is cooled and passed through a first draw roller assembly (,) while elevating the temperature of the filament. The filament (,) is heated in a heating zone (,) as it exits the first draw roller assembly. 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 (,).

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Pencaitland, United Kingdom

Ian Roberts