Abstract:
A static electric charge removal of dispersal coating for ullage tapes having an outer polymeric surface. The coating is formed of carbon black and is applied to the polymeric surface of the ullage tape to disperse therefrom any static electric charge which may be generated thereon when used for measurement purposes in large tanks which can build up a high static charge therein. The carbon black coating is preferably acetylene black formed on the tape and simultaneously anchored thereto by passing the tape near a fuel rich acetylene flame. Any excess coating which is not anchored to the tape can be removed by wiping or other similar operation.The method of this invention can be used to apply an acetylene black coating to polymeric items such as fluorocarbon wire, tape, or other forms which can be passed in close proximity to a fuel rich acetylene flame.
Abstract:
A method for coating a tubular food casing includes subjecting an inflated section of the food casing to a cloud of electrostatically charged dry particles and sintering the coated food casing. The process provides a pin-hole free coating and permits a continuous operation.
Abstract:
Contacting surface of sulfur-cured ethylene, propylene, nonconjugated diene elastomer containing carbon black with ozone in concentration of at least 100 parts per million of the atmosphere to condition the surface for painting.
Abstract:
This invention provided a way of modifying the surface properties of substrates such as films of plastics material. The substrate is given a very thin coating of a mixture of modifying materials and the latter is then bonded to the substrate by irradiation with ultra-violet light. A modifying material which gives the desired surface properties is present as an emulsion in a solution of a second modifier which is readily bondable to the substrate by ultraviolet light. Although the resulting bonded modifying material is so thin as to lead to negligible increase in weight, the surface properties of the substrate become those of the modifying material while its bulk properties remain the same. The invention is particularly useful for imparting hydrophilic surfaces to films of plastics material.
Abstract:
A method and device for coating plastic films in which the thickness of the coating is controlled by passing the coated film under steady pressure past a resilient scraping member in whose surface are embedded solid particles which space the film from the surface of the resilient member.
Abstract:
PROCESS FOR THE SPRAY COATING OF PLASTIC ARTICLES WHEREIN THE ARTICLES ARE SURFACE SULFONATED BEFORE THEY ARE ELECTROSTATIC SPRAY COATED. THE ARTICLES CAN BE NEUTRALIZED AFTER SULFONATION IF DESIRED. A DEGREE OF SULFONATION OF AT LEAST ABOUT 0.001 MILLIGRAM SULFUR TRIOXIDE OR EQUIVALENTS THEREOF PER SQUARE CENTIMETER OF PLASTIC SURFACE IS REQUIRED TO GIVE THE DESIRED UNIFORM COATING AND GOOD ADHESION. THE SPRAYED COATINGS CAN BE LIQUID PAINTS OR LACQUERS, POWDERED PLASTICS AND LIQUID COATINGS CONTAINING FILAMENTARY REINFORCING AGENTS WHICH ARE NORMALLY CURED BY DRY ING, HEATING AND DRYING, OR HEATING.