초록 ▼

Method and apparatus for making and coating a plastic lens. Oxygen barrier containing photoinitiator is used to cure incompletely cured lens portions. Radiation pulses are used to control lens curing rate. Lens is postcured while in a mold cavity using a conductive heat source. Air may be directed t

Method and apparatus for making and coating a plastic lens. Oxygen barrier containing photoinitiator is used to cure incompletely cured lens portions. Radiation pulses are used to control lens curing rate. Lens is postcured while in a mold cavity using a conductive heat source. Air may be directed toward the mold cavity to help remove heat from the lens. An in-mold scratch resistant coating may be formed from two separate material which both contain a photoinitiator.

대표청구항 ▼

Method and apparatus for making and coating a plastic lens. Oxygen barrier containing photoinitiator is used to cure incompletely cured lens portions. Radiation pulses are used to control lens curing rate. Lens is postcured while in a mold cavity using a conductive heat source. Air may be directed t

Method and apparatus for making and coating a plastic lens. Oxygen barrier containing photoinitiator is used to cure incompletely cured lens portions. Radiation pulses are used to control lens curing rate. Lens is postcured while in a mold cavity using a conductive heat source. Air may be directed toward the mold cavity to help remove heat from the lens. An in-mold scratch resistant coating may be formed from two separate material which both contain a photoinitiator. rein the buoyancy of said cover unit is sufficient such that a portion of the upper surface of said cover unit remains at least about 2 cm above the surface of the body of water after said maximum weight of biomass has grown on and within said cover unit. 9. A self-floating cover system according to claim 1 wherein said cover unit comprises a layer having a plurality of openings which are at least about 0.5 mm in their largest dimension. 10. A self-floating cover system according to claim 1 wherein said cover unit comprises a layer having a plurality of openings which are from about 2.5 to about 50 mm in their largest dimension. 11. A self-floating cover system according to claim 1 wherein said cover unit comprises a layer having a plurality of openings which are from about 5 to about 30 mm in their largest dimension. 12. A self-floating cover system according to claim 1 wherein the cover system is structured such that when the maximum weight of biomass has accumulated on and within the cover system, the cover system and biomass remain permeable to rain water such that substantially all the rain water will pass through the biomass and cover system rather than pool on top of the cover system. 13. A self-floating cover system according to claim 1 wherein the cover system is structured such that when the maximum weight of biomass has accumulated on and within said cover system, the cover system remains permeable to gases discharged from said body of water to allow gases from the body of water to permeate into aerobic biomass on and within said cover system so that the gases can be oxidized. 14. A self-floating cover system according to claim 1 wherein said buoyant material comprises closed cell polyethylene foam. 15. A self-floating cover system according to claim 1 wherein said buoyant material comprises closed cell polypropylene foam. 16. A self-floating cover system for reducing offensive gases and/or odors emitted from a body of water, the cover system comprising: at least one gas permeable cover unit sized and shaped to cover at least a portion of the body of water, said cover unit being flexible and having an upper surface formed by a filamentary material and capable of supporting growth of aerobic biomass capable of oxidizing emissions from the body of water thereon when the cover system is placed onto the surface of the body of water, a buoyancy-imparting layer substantially co-extensive with the cover unit in area of coverage and constructed of a buoyant material, the buoyancy of said cover unit being greater than the maximum weight of biomass that accumulates on and within said cover unit when the cover system is placed onto the surface of the body of water such that at least a portion of the upper surface of the cover unit remains above the surface of the body of water, said cover unit comprising a layer having a plurality of two differently sized openings, the smaller openings being from about 0.5 to about 10 mm in their largest dimension and the larger openings being at least about 10 mm in their largest dimension. 17. A self-floating cover system for reducing offensive gases and/or odors emitted from a body of water, the cover system comprising: at least one gas permeable cover unit sized and shaped to cover at least a portion of the body of water, said cover unit being flexible and having an upper surface formed by a filamentary material and capable of supporting growth of aerobic biomass capable of oxidizing emissions from the body of water thereon when the cover system is placed onto the surface of the body of water, a buoyancy-imparting layer substantially coextensive with the cover unit in area of coverage and comprising multiple layers, at least two of which are formed of different buoyant materials, the buoyancy of said cover unit being greater than the maximum weight of biomass that accumulates on and within said cover unit when the cover system is placed onto the surface of the body of water such th