Abstract:
A high performance resilient skate wheel (100) including a solid core tire (102) and a hub (104) defining a bearing axis. The solid core tire (102) includes an inner ring (106) and an outer tire material (108) disposed about the inner ring and forming a rolling surface of the wheel. The outer tire material (108) is harder than the inner ring (106). The inner ring (106) has a stepped profile in cross section, defining a middle portion disposed axially between lateral portions of the inner ring, with the middle portion having a greater outer diameter than the lateral portions. Making the solid core skate wheel (100) includes providing a hub assembly having an inner ring (106) with a stepped profile in cross section disposed about a wheel hub (104), and over molding the inner ring with a tire material (108) forming a rolling surface of the wheel.
Abstract:
A skate wheel and method of making the same are provided. The skate wheel includes multiple materials of differing durometers disposed on an inner hub. First, a solid or microcellular urethane is seated on an outer rim of the hub in a ring configuration around the rim. A urethane tire material surrounds the ring. The outer tire material is constructed preferably of a urethane that is more durable and harder than the ring. The ring is made of a highly resilient urethane for high speed. A wheel also is provided with energy absorption to counter rough road surfaces with less loss of energy by the skater, while increasing the traction of the skate wheel on the surface. A method is also provided of making a wheel by pouring differing resins into a mold and either spinning or separating the resins while allowing their interfaces to cure together for bonding therebetween.
Abstract:
A method for the preparation of toners that exhibit relatively low conductivity (10.sup.-9 to 10.sup.-14 ohm.sup.-1 cm.sup.-1) and positive triboelectrical properties (5.0-30.mu. c/g) is disclosed. The process steps include first forming a homogeneous dispersion of both carbon black particles and particles of a second pigment saturated with monomer and initiator by intimately mixing at least one monomer, carbon black, particles of the second pigment, and a polymerization initiator and adding the mixture to a mixture of sufficient water and at least one alcoholic dispersing agent to form a homogeneous dispersion solution. The solution is then heated to a temperature sufficient to substantially complete the polymerization of the monomer and form a homogeneous polymeric dispersion of the carbon black particles and the particles of the second pigment. Thereafter a weak organic acid (PKa 3.0-6.0) or a weak acid anhydride (PKa 3.0-6.0) is added to the polymeric dispersion in an amount sufficient to substantially complete the esterification of the alcoholic dispersing agent and the toner particles are then recovered.
Abstract:
Rollers for high speed printers and paper handling devices are fabricated by reacting polymeric diphenylmethane diisocyanate with a polyester polyol and/or polyester polyamine and an optional extender, together with a metal salt, a catalyst, and one or more other optional additives, including a liquid conductive additive. The resulting rollers provide a hardness as low as 15 A on cube, a resistivity as low as 5E4 Ω·cm, a compression set as low as 0.5% at room temperature and as low as 3% at 157° F., and low tackiness as low as 13 g/cm of adhesion force.
Abstract translation:用于高速打印机和纸张处理装置的辊子通过使聚合二苯基甲烷二异氰酸酯与聚酯多元醇和/或聚酯多胺和任选的增量剂与金属盐,催化剂和一种或多种其它任选的添加剂,包括液体 导电添加剂。 所得到的辊在立方体上提供低至15A的硬度,低至5E4Ω·cm的电阻率,室温下的压缩变定低至0.5%,在157°F时低至3%,并且低粘性为 低达13 g / cm的粘附力。
Abstract:
Rollers for high speed printers and paper handling devices are fabricated by reacting polymeric diphenylmethane diisocyanate with a polyester polyol and/or polyester polyamine and an optional extender, together with a metal salt, a catalyst, and one or more other optional additives, including a liquid conductive additive. The resulting rollers provide a hardness as low as 15A on cube, a resistivity as low as 5E4 Ω·cm, a compression set as low as 0.5% at room temperature and as low as 3% at 157° F., and low tackiness as low as 13 g/cm of adhesion force.
Abstract:
A printing cartridge adapted for use with thermal transfer printing apparatus. The cartridge includes a frame defining first and second printing stations, a ribbon supply spool, and a ribbon take-up spool, both of the spools being rotatably mounted on the frame. The ribbon has a backing layer and an ink donor layer and is guided in a feed path extending from the supply spool through the first and second printing stations, again through the first station, then to the take-up spool. The frame of the cartridge is adapted to receive a thermal printing head for engaging the ribbon at each of the first and second printing stations. The feed path has a first leg extending from the supply spool, through the first printing station, to the second printing station; a second leg extending through the second printing station to the first printing station; and a third leg extending through the first printing station to the take-up spool. A ribbon backing roller rotatably mounted on the frame engages the ribbon in the third leg of the feed path at the first printing station such that ink from the ribbon in the first leg of the feed path at the first printing station is transferred to the ribbon in the third leg of the feed path also at the first printing station. The thermal printing head at the second printing station engages the ribbon in the second leg of the feed path such that ink is transferred to a workpiece. The ink may be of the fluorescent type.
Abstract:
A method for the preparation of a fluorescent ink layer for a fluorescent thermal transfer sheet is disclosed. The method comprises first forming a solution of a mixture comprising at least one acidic monomer, at least one basic monomer and at least one fluorescent dye. Thereafter, an emulsion of the solution is formed and the emulsion is polymerized.
Abstract:
Semi-conductive silicone compositions and articles of manufacture containing these compositions are formed by combining a silicone precursor composition with an alkali metal salt and polymerizing the silicone precursor composition in the presence of the alkali metal salt to form a polymerized semi-conductive silicone composition. The polymerized silicone composition can be formed into a solid or foam article of manufacture having a volume resistivity of E8 to E12 ohm-cm, such as a roller or an anti-static belt.
Abstract:
A conductive roller for use in a laser printer includes a solid, thermoset urethane comprising a metal salt and having a hardness of between 30 Shore A and 50 Shore A on cube and a volume resistivity of 1E6 ohm-cm and 9E8 ohm-cm.
Abstract:
A conductive quasi-solution useful for making a homogeneously conductive single-phase polyurethane, comprising a transition metal salt, a carrier solution, and a dispersing agent, wherein said conductive quasi-solution has a transition metal salt concentration between 10 and 30% by weight, and methods of making thermoset and thermoplastic polyurethane polymers therewith.