Abstract: Method for tempering a molding tool intended for production of products of natural or synthetic polymers, which molding tool includes one or more molding parts (3, 4) made of sintered metal with communicating pores obtained by pressing at a high pressure and sintering at a high temperature of a powdered material, in which molding part or parts (3, 4) a molding cavity (9) has then been made, whereby preferably the outer envelope surface of the molding tool is tight. The method comprises tightly connecting one or more channels, capillary tubes (6, 8) or the like through the tight outer envelope surface to the mould material of the molding tool situated inside, which material contains a large number of small communicating pores and feeding a gas having a suitable state and a suitable temperature through the channels thereby causing a rapid tempering of the molding tool to a desired extent.

Abstract: Method for tempering a moulding tool intended for production of products of natural or synthetic polymers, which moulding tool includes one or more moulding parts made of sintered metal with communicating pores obtained by pressing at a high pressure and sintering at a high temperature of a powdered material, in which moulding part or parts a moulding cavity has then been made, whereby preferably the outer envelope surface of the moulding tool is tight. The method comprises tightly connecting one or more channels, capillary tubes or the like through the tight outer envelop surface to the mould material of the moulding tool situated inside, which material contains a large number of small communicating pores and feeding a gas having a suitable state and a suitable temperature through the channels thereby causing a rapid tempering of the moulding tool to a desired extent.

Abstract: Method in the washing of alkaline, cellulosic pulp, for example sulphate pulp, CTMP and CMP pulp, the washing being effected in at least one stage. By an addition of carbon dioxide, there will be realized greatly reduced washing losses of, primarily, inorganic ions, as well as improved washing-out of substances which give rise to chemical oxygen demand (COD).

Abstract: The present invention relates to a method of producing a protective gas consisting of 0.0010-0.100 percent by volume nitric-oxide, 0-90 percent by volume helium, 0-5 percent by volume hydrogen, 0-50 percent by volume carbon dioxide, and the remainder argon. The invention also relates to a gas mixture for producing the productive gas. The method of producing the protective gas is characterized by dissolving nitric oxide in condensed argon to a concentration of 0.0010-0.100 percent by volume, calculated on gas phase, vaporizing the resultant solution and mixing remaining constituents in the vaporized solution in such proportions as to obtain a protective gas of the predetermined composition. The gas mixture used for producing the protective gas is characterized in that it consists of 0.0010-0.100 percent by volume nitric oxide in condensed argon, calculated on gas phase, and is preferably held under an overpressure.

Abstract: There is described a method for treating delimed and bated hides, i.e. pelts. According to the inventive method, the pelts are brought to a suitable mineral tanning state and then tanned with mineral salts. The inventive treatment process corresponds to the conventional processes of pickling, tanning and basifying. The inventive method includes the treatment of pelts with weakly acid treatment liquids while supplying carbon dioxide and additions of tanning mineral substances subsequent to pretreatment, without or with the addition of solely a small amount of liquid, wherein the quantity of treatment liquid is supplemented after a predetermined treatment time.

Abstract: A device is adapted for coupling together two vacuum lines, such that when coupled the lines can be rotated relative to each other. Each of the vacuum lines includes two mutually concentric pipes which define a vacuum space therebetween. The coupling device includes a first coupling part, a male part, on the one vacuum line, and a second coupling part, a female part, on the other vacuum line. Located between the male part and the female part is at least one sealing ring which is arranged so as not to come into direct contact with a cold or a hot medium flowing through the inner pipe. The invention also relates to male and female parts of the coupling device for coupling together vacuum lines which, subsequent to being coupled, can be rotated relative to each other.

Abstract: A method of destructing mineral-wool scrap and reusing the scrap in the manufacture of mineral wool includes introducing the mineral-wool scrap in a finally divided state into a container causing the finely-divided mineral-wool scrap to pass through a heating zone generated by an oxygen burner such as to convert the mineral-wool scrap to a liquid state and delivering the molten mineral-wool scrap into a furnace in which a melt for manufacturing mineral-wool is produced or to an intermediate container mounted between the furnace and a spinning machine. When the molten mineral-wool scrap is being delivered to the intermediate container, molten material taken from the furnace is also delivered to the intermediate container.

Abstract: An arrangement for use when treating a melt, particularly a metal melt (2) in a converter (1) with gas, for the purpose of intensifying and rendering effective the contact between gas and melt and to produce effective admixture of the gas with the melt. The arrangement includes at least one nozzle (5) which discharges into the melt (2) and which is operative to deliver the gas in the form of at least one high pressure jet. For the purpose of producing a high gas pressure of such value as to produce a finely-divided mixture of gas and melt in a jet zone (10) in the melt (2), a pressure-elevating device (9) is incorporated in the fluid line connected to the nozzle (5). The invention also relates to a method of treating a metal melt in a converter.

Abstract: Steel is carburized at a temperature within the austenitic range and in an atmosphere which comprises nitrogen, hydrogen and carbon monoxide, by lowering the hydrogen concentration in the treatment atmosphere prior to cooling steel in oil, salt or water, so as to reduce the hydrogen concentration in the carburization layer of the steel, by outward diffusion of hydrogen from the carburization layer.

Abstract: A method for reducing the flame temperature of an oxy-fuel burner, such a burner comprising a central oxygen nozzle at least one fuel nozzle radially spaced from the central oxygen nozzle, and at least one peripheral oxygen nozzle at greater radial distance from the central oxygen nozzle than the fuel nozzle, all nozzles being at least substantially parallel, a casing surrounding the nozzles and whose forward end lies in a plane at right angles to the longitudinal axis of the burner, and whose rear portion defines an oxygen chamber, and means for the supply of oxygen-containing gas and fuel, respectively, to the nozzles. The peripheral oxygen nozzle is in the form of a Laval nozzle or, if it is an annular nozzle, is of the same cross-sectional variation as the Laval nozzle throughout its entire length.

Abstract: The invention relates to a blasting method for removing coatings of paint, varnish or like substances from objects coated with such substances, in which the objects are cooled in a condensed gas, e.g. liquid nitrogen, and then subjected, in a chilled state, to the effect of a blasting agent, e.g. steel shot, delivered by a blasting machine. The coating fragments dislodged are collected together with the blasting agent and mutually separated one from the other in a separator. The recovered blasting agent is then returned to the blasting machine. The method is characterized by adding an absorbent to the blasting agent in the blasting machine.

Abstract: The disclosure relates to a method for supplying, with a lance (11), a liquid to a heat treatment oven, the liquid being vaporized by the oven heat and being introduced into the oven with the aid of a carrier gas, and a lance (11) for carrying the method into effect.According to the method, the liquid is, with a carrier gas, atomized in an end of the lance (11) facing away from the interior of the oven, the atomized liquid and the carrier gas being supplied to a vaporization chamber (12) with an outlet aperture (14) directed towards the interior of the oven, in which chamber (12) the atomized liquid is vaporized by the oven heat during simultaneous cooling of the chamber (12), and the thus formed vapor and carrier gas are caused to depart from the vaporization chamber (12) of the lance (11) through the aperture designed as a nozzle (22).

Abstract: An electrode for electric arc processes composed of a water-cooled holder (1) into which is fitted a case hardened of diffusion coated insert of zirconium or hafnium. The diffusion zone (5) consists of carbide, nitride, boride or silicide, compounds with very high melting points that will supress reactions between the holder and the insert that cause deterioration of the electrode.

Abstract: A valve system is provided for enriching a flow of one gas with flow of another gas, with the mixing of the gas flows being conducted so as to maintain a constant ratio of the two gases in the resultant flow. The system of the present invention is particularly well suited for use in enriching a flow of pressurized combustion air with a flow of oxygen. A mixing valve is utilized that has a body which extends into a supply line through which combustion air is ducted under pressure to a burner. The mixing valve provides an injection location at the center of the combustion air supply line where relatively movable valving components are positioned for introducing oxygen into the flow of combustion air. The introduction of oxygen into the combustion air flow is regulated in accordance with the flow rate of the combustion air as it is sensed at the location of the mixing valve. The body of the mixing valve defines a chamber that is divided into segregated portions by a flexible diaphragm.

Abstract: In laser cutting of metallic workpieces, for avoiding burr and slag formation in the kerf, providing good weldability and high cutting speed in the workpiece, use is made of a cutting gas which comprises at least one active gas, such as for example, oxygen. The cutting gas is mixed with at least one substantially inert gas, such as for example, He, N.sub.2, Ar, of CO.sub.2, a gas or gas mixture which has but slight reactive tendencies with the material in the workpiece, the oxygen concentration lying in the range of about 30% to about 90% of the total cutting gas content.

Abstract: A head which is intended to be mounted on a ladle, is provided inside with refractory material. At least one burner for liquid or gaseous fuel and oxygen gas for heating the melt in the ladle is disposed in the head. The head is provided with retainer means for the burner, by the intermediary of which the burner is axially shiftably disposed in relation to the surface of the melt bath and is rotatably disposed in relation to the vertical line of the burner to the surface of the melt bath. Depending upon the burner output, the burner is adjustable so as to emit the best possible heat transfer from the burner flame to the melt bath and, at the same time, to cause the slightest possible chemical action on the melt bath.

Abstract: An apparatus for preventing the solidification and accumulation of material from the tapping jet in and on the tapping spout in the manufacture of mineral wool includes at least one oxy-fuel burner at the discharge section of the tapping spout to the spinning machine. The burner (13) is disposed at such a distance and directed such that the discharge section of the tapping spout and the first portion of the tapping jet departing from the spout are heated by the burner flame and the impulse of the burner flame is of such a size that the configuration and position of the jet will remain unaffected.

Abstract: A method of attaching a connection piece of metal to a metal surface by brazing wherein the required heat is generated by an electric arc. The heat generated by the electric arc is conducted through at least a portion of the connection piece and melts a brazing metal provided between the connection piece and the metal surface. The heat conducting portion of the connection piece prevents direct contact between the electric arc, the metal surface and the brazing metal during melting which prevents disadvantageous thermal actuation of the metal surface. When the current to the electric arc has been disconnected, a mechanical force is applied to the heat conducting portion of the connection piece pressing the latter against the metal surface and pressing out a portion of the brazing metal from underneath the remaining joint-forming surfaces of the connection piece.

Abstract: A device in a cutting torch which comprises a torch body with a valve housing and a nozzle and with a cutting oxygen duct, a heating oxygen duct and a combustion gas duct disposed in the torch, there being disposed in the torch a connection line which contains a throttling member between the heating oxygen duct and the cutting oxygen duct and wherein disposed in the cutting oxygen duct before the connection line is a valve member which permits a flow of heating oxygen to pass through the cutting oxygen duct only in the direction towards the orifice of the nozzle.The connection line between the heating oxygen duct and the cutting oxygen duct comprises at least one cooling oxygen duct (7) disposed in the nozzle which is elaborated with three sealing surfaces towards the torch body.