Abstract: A method of producing a curved glass sheet having a colored coating layer formed in a selected region, such as a marginal region in the case of a window glass for the rear window of an automobile, by applying a coloring agent comprising inorganic pigment and glass frit of a low melting temperature onto a flat glass sheet surface, heating the glass sheet and press-bending the heat-softened glass sheet while the applied coloring agent is in fused state. As a novel feature, the coloring agent comprises alumina powder which adheres to the surfaces of the glass frit particles until fusion of the glass frit on the glass sheet surface. The presence of alumina powder prevents a shaping tool pressed against the glass sheet from adhering to the fused layer of the coloring agent.

Abstract: Improvements in a method for producing a pressed glass article are disclosed. The method includes causing a gas to flow from a manifold around the exterior of a plunger used for pressing a gob of softened glass in a mold; the improvements include the use of a gas which is a cold mixture of at least one alkane and at least one unsaturated hydrocarbon, control of the proportion of alkane to unsaturated hydrocarbon so that a substantially invisible lubricious coating is deposited on the plunger, causing the gas to flow at a sufficiently high rate to cause excessive cooling, and controlling the temperature of the plunger by periodically interrupting the gas flow. The method of the invention provides cooling and lubrication of glass pressing apparatus with a single gas mixture, and helps to alleviate such problems as high expense, inadequate cooling and/or lubrication, pollution and excessive carbonaceous residue which can result from conventional methods.

Abstract: A method for preparing a glass container, and for sealing a glass mouth of a container and the seal are described. The sealing surface, or finish, of the container is subjected to a hot end treatment after forming and before annealing to enhance adhesion between the container finish and a thermoplastic membrane seal. The container is next annealed and after annealing is subjected to a cold end treatment in which the exterior container surface is coated with a material which enhances the lubricity and increases the abrasion and scratch resistance of the container. The container finish only is then subjected to a brief heat treatment sufficient to remove any lubricity enhancing material from the finish. A membrane comprising a thermoplastic film is pressed onto the container finish and heated causing glass-plastic adhesion and forming a closure.

Abstract: An improved release surface for a laminating mold is disclosed wherein a glass mold surface is treated with methylchlorosilane to provide a release surface which is then polished with a polar solvent such as alcohol to remove oily residue from the release surface of the mold so that the surface of the released article is free from haze.

Abstract: The present invention relates to a process for treating molten glass contacting surfaces including forming molds, gob chutes, neck rings, and the like, with an organic solution of a metal organic phosphate having a finely-divided lubricious filler dispersed therein, the dispersion being used to coat such glass contacting surfaces and the coating being heated to form a degradation product having improved glass releasing and wear-resistant properties. The coating forms a solid film lubricant especially adapted for use in manufacturing glass articles providing quick release of the molded glass articles, a protective lubricant layer for the glass contacting surfaces, and eliminating the need for frequent swabbing of such surfaces, especially mold surfaces with oily compositions.

Abstract: A process of forming glass balls by treatment of particulate vitreous material and a second material comprising carbon material and a carbonated salt. The process is carried out at a temperature, for the particular particulate vitreous material, which corresponds to a viscosity of from about 10.sup.6 to about 10.sup.3.5 poises with mixing and agitation.The apparatus includes a furnace having a tube (4) adapted to rotate about an horizontal or inclined axis, delivery means (10, 12, 14) to the tube for the materials to be treated, and heating means (8, 20) for heating the tube and the bed of material from both an external and internal location.

Abstract: Release and lubricating composition for avoiding seizure between molten glass and metal molds for forming glass articles, for minimizing wear between mold sections and for improving the pack of glassware, comprising, a dispersion of graphite in a polyphenylene sulfide, molds having such composition coated thereon, and a method of applying the composition to molten glass contacting surfaces comprising dispersing the composition containing graphite with the polyphenylene sulfide in the form of small particles in a carrier, applying the dispersed composition to the glass contacting surface and then curing the coating at an elevated temperature, including curing resulting from hot molds during glassware production.

Abstract: A method and apparatus for shaping glass sheets by gravity sagging using a pair of oblique slides to support an opposite pair of edges of a flat glass sheet, which is supported on said slides in shaping relation over an outline shaping mold and heated until it sags to conform to the upward facing shaping surface of the mold disposed between and below said slides. The gist of the present invention is to selectively apply cooling fluid against the glass sheet adjacent one of the opposite glass sheet side edges whenever the opposite side edge begins to slide and sag an observable amount more than the adjacent side edge. The selective application is discontinued when both of the glass sheet edges are in approximate horizontal alignment with one another. If necessary, this process is repeated throughout the gravity sagging operation, thereby ensuring that the glass sheet comes to rest on the peripheral shaping surface of the outline mold in proper alignment therewith.

Abstract: Improvements are provided in glass forming processes of the type wherein hot metal blank molds are employed by using the complementary action of a solid film lubricant layer, of graphite dispersed in a cured thermoset organopolysiloxane, along with an overspray of a lubricating oil.

Abstract: A powder is applied to a glass ribbon as the ribbon is displaced between an annealing lehr and a cutting station. The powder on the ribbon facilitates removal of glass chips (1) generated during the cutting of the ribbon into sheets and (2) projected onto the top surface of the glass ribbon. The powder is applied by vaporizing same in a chamber and condensing the vaporized powder on or allowing the powder to condense in the chamber and fall on the top surface of the ribbon as it is displaced past the chamber.

Abstract: A composition particularly effective as a high temperature lubricant for molds used in glass-forming operations and effective at high temperatures of the order of about 1,000.degree. F, comprising a mixture of graphite and a high melting inorganic oxide or salt, preferably potassium titanate, and an inorganic binder e.g. a slurry of magnesium oxide in a mixture of phosphoric acid and chromic acid. The mold lubricant composition also preferably contains a wetting agent, e.g. butyl Cellosolve (ethylene glycol monobutyl ether).

Abstract: A composition and method of preparation are herein described for molten release and parting compositions adaptable for use in glass-forming operations. The novel composition comprises an aqueous dispersion of a mixture of a solid lubricant, a water-soluble silicate binder, a setting agent, and a water-soluble phosphate. A preferred composition comprises a mixture of flake graphite, boron nitride, sodium silicate, zinc oxide and potassium phosphate tribasic.

Abstract: Release and lubricating compositions are disclosed for avoiding seizure between molten glass and metal molds for forming glass articles and for improving the quality of glassware produced therefrom, comprising an aqueous dispersion containing polyphenylene sulfide, an inorganic binder, and a solid lubricant. The inorganic binder may be represented by the general formula MPO.sub.4 wherein M is a metal ion selected from the group consisting of aluminum, chromium, magnesium, iron and zinc. The particular solid lubricants include members selected from the group consisting of graphite, molybdenum disulfide, polyterafluorethylene, and mixtures thereof.

Abstract: An improved method of making films, sheets or plates of a transparent plastics material of high optical quality comprises depositing a solution, molten mass or reaction mixture which yields the solid plastics on drying or hardening on a moving glass ribbon having a smooth upper surfce. The ribbon may be made by the float glass process. The plurality of plastics layer may be deposited one on another.

Abstract: In a glass container making machine using a split face mold, means are provided for controllably diverting the parisons from the mouth of the mold to a waste glass collector when the mold is closed so that at the same time swabbing means lubricate the inner faces of the mold cavity.

Abstract: Periodic application of a composition comprising monoaluminum dihydrogen phosphate, Al(H.sub.2 PO.sub.4).sub.3, as a binder and an anti-wear agent such as finely divided hard metals, solid lubricants or the like to clean surfaces of molds used in manufacturing glass parts facilitates quick release of molded glass parts from the mold, provides a protective coating for the mold surfaces, and eliminates the necessity for frequent swabbing of the mold with oily compositions.