Abstract: A process for the preparation of stable aqueous aldehyde resin dispersions and for the production of surface coating binders.For this purpose, a melt or highly concentrated solution of a polycondensate of urea and a CH-acidic aldehyde, with or without formaldehyde, is dispersed in water in the presence of an organic protective colloid and, if required, an emulsifier.These aqueous resin dispersions can be used, in combination with other film formers, as surface coating binders.

Abstract: A process for the preparation of a stable aqeuous ketone resin or ketone/aldehyde resin dispersions and a process for the production of surface coating binders. For this purpose, a melt or a highly concentrated solution of the ketone resin or ketone/aldehyde resin is dispersed in water in the presence of an organic protective colloid. These aqueous resin dispersions can be used, in combination with other film formers, as surface coating binders.

Abstract: An apparatus for the introduction of a gaseous medium into a chamber, especially for compressing casting molding material with a high-pressure gaseous medium supplied by a pressure vessel linked with the chamber by means of a valve system. The system has a seat having traversing openings which can be covered or uncovered by a stroke-activatable valve plate. The gaseous medium flows freely round the surface of the valve plate. The valve plate also is provided with traversing openings which, however, are displaceably arranged vis-a-vis the traversing openings of the valve seat. To trigger a pressure shock from the gaseous medium necessary to effect compression, an elevating mechanism for the valve is activated to lift the valve plate. The pressurized gaseous medium then flows round, as also throughout the valve plate and acts on the surface of the chamber.

Abstract: A grinding machine and method for flat, board-shaped workpieces, especially for particle-board materials, fiber materials, veneer materials, and mineral materials, utilizing at least one continuous belt unit having a grinding belt that is supported upon rollers, a counterpressure element, and means for adjustable spacing the counterpressure element relative to the grinding belt for forming a gap corresponding to the thickness of the workpieces being ground therebetween is improved through the further utilization of support means for maintaining the counterpressure element in a substantially plane-parallel orientation relevant to the grinding belt during grinding. In accordance with a preferred embodiment of the grinding machine, the counterpressure element is a backing roller to which a variable pressure is applied by a pneumatic piston-cylinder unit.

Abstract: Loosely poured granular material is compacted by a burst of air under pressure which is built up in a space Q1 and is abruptly released through the outlet end of a passageway Q3 which opens toward the material surface. While the pressure in Q1 is being built up and until released, it is restrained by a sealing member which concurrently covers the outlet side of Q1, the input end of passage Q3 and an accelerating space Q2. The sealing member is held in place by a counterpressure in a space Q4 acting on a larger surface area than Q1. The pressure is suddenly decreased in Q4, abruptly unbalancing the pressures and releasing the pressurized gas from Q1 into Q3 and against the surface.

Abstract: The apparatus has a plurality of tubular hollow members arranged between the pressure chamber and the molding units, in the pressure surge flow direction, for conducting the gaseous medium to the top of the molding material. With distribution of the pressure medium flow through a plurality of independent and different cross sections, the lifting force required to open the packing element is greatly reduced and the packing element can be opened rapidly.

Abstract: An apparatus for compacting granular molding material, particularly foundry molding material, includes a filling unit, a compression unit and a molding unit. A sealing surface on the molding unit is engaged by depending sealing strips on the compression unit to provide a tight seal. The opposed sealing strips extending parallel to molding unit movement have force-transmitting sealing elements, while the other pair of opposed sealing strips extending perpendicular to the molding unit movement repel molding material from the sealing surface.

Abstract: A belt grinding machine is described for the grinding of chipboard, fibreboard, faced board for similar boards in which the upper part of the housing can be raised and lowered relative to the lower part of the housing by a lifting device for adaptation to different board thicknesses. Spaced apart distance pieces or spacers are provided between the two parts of the housing to enable the basic board thickness to be selected. In order to ensure that boards of widely varying thicknesses can be machined with a grinding accuracy which meets the highest requirements, even when the boards that are supplied have relatively large thickness variations, a vertically steplessly adjustable clamping element, which is acted on by a pressure fluid, is associated with each spacer. In the lowered state of the upper part of the housing the clamping device clamps the upper part to the lower part with the spacers being trapped therebetween. The pressure of the pressure fluid supplied to the clamping devices is adjustable.

Abstract: In a molding machine for producing foundry sand molds the sand is compressed or packed by means of a pressure wave acting on the sand surface produced by explosive combustion of a mixture of fuel and air. The dosing of the fuel to be burned is carried out by a pressure regulated supply pipe, in which a dosing container is filled with fuel, e.g., gas, up to an exactly defined excess pressure. This fuel or gas is thereafter fed to the combustion chamber under relief of the gas pressure in the dosing container down to a lower pressure level.

Abstract: A process is disclosed for insolubilizing casein coatings for leather utilizing alkoxy alkyl ureas. The coatings are cured in the presence of an acid catalyst. The casein coatings of the invention avoid the disadvantageous use of aldehydes such as formaldehyde and glutaraldehyde to cure the casein and reduce its water sensitivity and unexpectedly show improved wet abrasion resistance.

Abstract: For packing granular materials, especially foundry moulding materials, by means of an exothermic reaction of a mixture of air and fuel in a combustion chamber (23), a relative movement between the combustible mixture and one or several pulse triggers (19), is produced during the exothermic reaction, preferably by a blower (20) disposed in the combustion chamber (23). Hence the measured amount of sand introduced into a moulding frame (11) and a filling frame (12) over a pattern (6) by means of a sand container (17) is packed to form a mould body.

Abstract: A process and apparatus for charging a capacitor, particularly for flash guns with a fast flash series, so as to achieve a short charging time while avoiding a high charging current pulse, the charging current during the course of the charging being regulated to a value which at least approaches a constant. The time constant of the charging circuit is altered during the charging process by a controlled resistance arrangement which is controlled in dependence upon the charging voltage of the capacitor.

Abstract: Co-condensates are prepared by condensing from 0.8 to 2.0 moles of butyraldehyde with 1 mole of a phenol at from 80.degree. to 220.degree. C. with the addition, before, during or after the condensation, of from 5 to 50% by weight, based on the mixture of phenol and butyraldehyde, of one or more thermoplastics containing functional groups, which reacts with phenol, butyraldehyde or the phenol-butyraldehyde resin under the condensation conditions. The co-condensates are used as hot-melt adhesives and as binders for nonwovens.

Abstract: A homogeneous suspension, in a buffered aqueous solution having a pH of 7.0 to 7.7, of a destroyed microorganism which is positive to the clumping factor, said suspension containing from 3 to 50 percent by weight of at least one polyhydric alcohol soluble therein, is disclosed, as are its manufacture and its use as a reagent for the determination of fibrinogen and for fibrin cleavage products.

Abstract: A process for the preparation of soft and hard resins, and their use in surface-coating binders are disclosed. According to the invention, soft and hard resins are prepared from a urea, formaldehyde and a CH-acidic aldehyde by reacting a urea of the general formula (I) or (II) ##STR1## where R.sup.1 and R.sup.2 are hydrogen or identical or different alkyl, A is alkylene and X is oxygen or sulfur, with formaldehyde and a CH-acidic aldehyde of the general formula (III) ##STR2## where R.sup.3 and R.sup.4 are identical or different alkyl, aryl or alkylaryl wherein the urea, formaldehyde and CH-acidic aldehyde are employed in a mole ratio of from 1:2:2 to 1:4:4, at from 60.degree. to 150.degree. C., in the presence of an acid and in the presence or absence of a solvent and/or diluent, and then treating the product with a base in an anhydrousmedium.

Abstract: A process for the preparation of soft and hard resins, and their use in surface-coating binders.According to the invention, soft and hard resins are prepared from a urea and a CH-acidic aldehyde by reacting a urea of the general formula (I) ##STR1## where X is oxygen or sulfur and R.sup.1 and R.sup.2 are hydrogen or identical or different alkyl, aryl or aralkyl, or may be an alkyleneurea radical, with at least 2 moles of a CH-acidic aldehyde of the general formula (II) ##STR2## where R.sup.3 is hydrogen and R.sup.4 is alkyl, aryl or aralkyl, or R.sup.3 and R.sup.4 are identical or different alkyl, aryl or aralkyl, in the presence of a strong acid, to give a condensation product, and then treating the latter with a base in an anhydrous medium.These soft and hard resins are used, in combination with other film-forming agents, as surface-coating binders.

Abstract: A coffee or tea pot is placed on a base plate of the coffee/tea maker. A boiler zone which includes a boiler vessel is located laterally adjacent the pot so that the pot is heated from the side when placed on the base plate in a predetermined position, as determined, for example, by locating notches or grooves. The boiler unit is laterally extended to partly surround the circumference of the side walls of the pot with extension wings. The back of the extension wings is insulated, for example by a housing, which also surrounds the boiler. The arrangement permits a short path of boiling water or steam from the boiler to the top of the pot, while efficiently transferring heat thereto.

Abstract: A resilient wire attachment clip has two respective longitudinally extending; elongated, loop portions positioned in two mutually parallel planes, each of the loops formed by an internal limb and an external limb connected by a resilient arc portion that extends through a slot in a housing wall, the external limbs of the two loop portions normally lying within a pair of parallel grooves on the exterior of the housing wall with the ends of the external limbs connected by a transversely extending portion that is spaced outwardly from the housing wall, the internal limbs of the two loop portions have hook-shaped free ends which with slight prestress engage two abutments on the interior of the housing wall to support the clip between the two abutments and the interior surface of the housing wall at the point of an interiorly directed bend in the internal limbs, with the major portion of the diameter of the loop arc portions positioned interior of the housing wall.

Abstract: A wide belt grinding machine which is provided with a control member to reverse, in the case of power failure, the pressure force effective on a piston which relieves the tension on an endless abrasive belt via a tensioning roll.

Abstract: A process for the manufacture of stable and at the same time highly reactive, liquid easy-care finishing agents for textiles containing, or consisting of, cellulose, the agents being manufactured from urea, formaldehyde, glyoxal and an aliphatic primary amine.