Abstract:
A corrosion resistant tube comprises a metal tube having an outer surface. A zinc layer is electrostatically bonded to the outer surface, wherein the zinc layer is selected from the group consisting of powdered zinc, powdered zinc nickel alloys, powdered zinc cobalt alloys, and powdered zinc aluminum alloys. One or more polymeric layers may be electrostatically bonded to the zinc layer, or to a surface treatment layer, wherein the polymeric layer(s) comprises powdered thermoplastic materials selected from the group consisting of powdered nylons, powdered fluoropolymers, powdered polyesters, and mixtures thereof. Optionally, the polymeric layer(s) may be electrostatically bonded directly to the outer surface. A process for producing corrosion resistant tubing may also contain the steps of electrostatically charging aerated particles of a powdered material in a fluidizing chamber and conveying grounded metal tubing through the charged particles, thereby uniformly coating the tubing outer surface, and heating the coated tubing.
Abstract:
A method of fabricating a tape for a tape rule disclosed herein comprises the steps of adding a dyestuff into a polyester material mixed with a binding glue and churning the mixture so as to offer the polyester material a specified color; adhering the colored polyester material by rolling with a 150° C. hot roller to both surfaces of a steel tape so as to form a base coat film; printing graduations on one or both surfaces of the tape already having the base coating; drying the tape by infrared radiation; rolling a mixture of a transparent polyester and a binding glue with the 150° C. hot roller on both surfaces of the tape to form a protecting layer; and finishing fabrication of the tape. The tape fabricated is flat, stiff, flexible, and friction resistant, also capable of saving production costs.
Abstract:
Processes for coating metal or polymeric substrates are provided which include the steps of: (a) applying a liquid basecoating composition to a surface of the metal substrate; (b) applying a first infrared radiation at a power density of 30 kilowatts per meter squared or less and a first air simultaneously to the basecoating composition for a first period of at least about 30 seconds, a first velocity of the air at the surface of the basecoating composition being about 4 meters per second or less, a first temperature of the metal substrate being increased at a first rate ranging from about 0.05null C. per second to about 0.3null C. per second to achieve a first peak metal temperature ranging from about 30null C. to about 60null C., such that a pre-dried basecoat is formed upon the surface of the metal substrate; (c) applying a second infrared radiation and a second air simultaneously to the basecoating composition for a second period of at least about 15 seconds, a second velocity of the air at the surface of the basecoating composition being about 4 meters per second or less, a second temperature of the metal substrate being increased at a second rate ranging from about 0.4null C. per second to about 1.2null C. per second to achieve a second peak metal temperature of the substrate ranging from about 60null C. to about 80null C., such that a dried basecoat is formed upon the surface of the metal substrate; and (d) applying a powder topcoating composition over the dried basecoat.
Abstract:
The present invention provides processes for drying and/or curing topcoatings and multicomponent composite coatings applied to surfaces of metal or polymeric substrates which include applying infrared radiation and warm, low velocity air simultaneously to the coating for a period of at least about 30 seconds and increasing the substrate temperature at a predetermined rate to achieve a specified peak temperature. Infrared radiation and hot air are applied simultaneously to the coating for a period of at least about 3 minutes and the substrate temperature is increased at a predetermined rate to achieve a specified peak temperature, such that a dried and/or cured coating is formed upon the surface of the substrate.
Abstract:
A method of powder coating at least one surface of a non-conductive object having a plurality of sequential steps. The first step is pretreating the surface of the non-conductive object to ensure that the surface is suitably cleaned. The second step to apply a sufficient quantity of moisture on the surface of the non-conductive object to facilitate adhesion of a powder coating to the surface. The next step is to spray a polymer coating powder on the moistened surface of the non-conductive object. This spraying step is done immediately following the application of moisture but prior to a complete evaporation of the applied moisture. The fifth step is to evaporate any remaining applied moisture from the non-conductive object prior to curing. The last step is to cure the coating on the surface of the non-conductive object without decomposing the powder and then either cool or allow the non-conductive object to cool naturally.
Abstract:
Processes for drying primer coating compositions applied to a surface of a substrate are provided in which the primer coating composition, if a liquid or powder slurry, is exposed to low velocity air having a temperature ranging from about 10° C. to about 50° C. for a period of at least about 30 seconds to volatilize at least a portion of volatile material from the liquid primer coating composition. Next, infrared radiation and low velocity warm air are applied simultaneously to the primer coating composition (liquid, powder slurry or powder) for a period of at least about 1 minute during which the temperature of the substrate is increased at a rate ranging from about 0.2° C. per second to about 2° C. per second to achieve a peak substrate temperature of the substrate ranging from about 30° C. to about 120° C. Infrared radiation and hot air are applied simultaneously to the primer composition for a period of at least about 2 minutes during which the temperature of the substrate is increased at a rate ranging from about 0.1° C. per second to about 10° C. per second to achieve a peak temperature of the substrate ranging from about 40° C. to about 155° C., such that a dried primer coating is formed upon the surface of the substrate.
Abstract:
Wood is electrostatically coated with a thermosetting powder coating system in which a mixture of a self-curing epoxy resin and a catalyst therefore is extruded and a low temperature curing agent are both pulverized and the powders are blended with conventional additives to make a coating powder which is deposited on a wooden substrate and heated to cure. The mixture of resin and catalyst does not cure within the extruder but it is made to cure at low temperatures by the separate addition of the curing agent. A small amount of the low temperature curing agent, insufficient to cause substantial curing during extrusion may be used in place of the catalyst.
Abstract:
A method of applying a coating material to two surfaces of a plate includes the steps of applying the coating material to the two surfaces simultaneously such that holding areas in the absence of the coating material are provided on the two surfaces in proximity of side ends of the plate with respect to a travel direction of the plate, and conveying the plate by holding the holding areas.
Abstract:
Coating compositions based on waxes, wax-like compounds, drying oils or alkyd resins are improved in their running behavior by the addition of additives which gel at elevated temperature. Other positive properties of the coating compositions, such as for example wetting, penetration (creepage), sprayability, are not adversely affected.
Abstract:
A process of powder coating of workpieces in which initially a workpiece is coated with color powder such that the powder adheres to the workpiece and subsequently the powder is baked in an oven, in which subsequent to coating and prior to baking the powder adhering to the workpiece is irradiated with electromagnetic radiation within a particular, defined surface portion so that the powder within the defined surface portion will gelate and stick to the workpiece, and in which the color powder adhering to the workpiece outside of said defined surface portion is removed subsequent to irradiation.