Abstract: The invention relates to a pressure plate arrangement for joining together a plurality of material webs each comprising at least one plain web and/or at least one corrugated web, to form a corrugated cardboard web (P), at least one of the material webs being provided with adhesive at least in sections. The arrangement comprises a contact pressure unit (14) provided with a pressure plate (22), and a heatable counterpressure plate (26), between which the material webs being joined together are passed. The contact pressure unit (14) and the pressure plate (22) are arranged to be approachable to or removable from the counterpressure plate (26), wherein the pressure plate (22) is also constructed to be heatable. The invention also relates to apparatus for joining together a plurality of material webs comprising a plurality of such pressure plate arrangements.

Abstract: Disclosed is a process for preparing a supported metallocene catalyst by introducing, in a first stage, a gas stream comprising an organoaluminum compound, an inert support material and water, into a first gas phase reactor; allowing the mixture to react under conditions effective to form an aluminoxane supported on said inert support material; metering a second gas stream comprising a metallocene into said gas phase reactor; allowing said mixture to react under conditions effective to form a supported metallocene catalyst; and drying, in a second stage, said supported metallocene catalyst, wherein said drying is carried out in a gas phase reactor.

Abstract: The invention relates to a process for preparing an offset printing ink or concentrate thereof from the individual components on which the printing ink is based, which involves combining the individual solid and liquid components in a mixer and processing them directly therein to form the offset-printing ink or concentrate.

Abstract: Bulk material is unloaded with a bucket conveyor from a ship floating in a body of water by first positioning the ship in the body of water between a stationary land-fixed location and a float spaced transversely therefrom. An outer intake end of a pivotal bulk conveyor on the float is supported at a fixed height above the body of water adjacent the ship and an opposite inner outlet end of the pivotal bulk conveyor at a fixed height above the stationary location. The pivotal bulk conveyor is swung about a horizontal axis to maintain the heights constant as the level of the body of water changes so that as the water level changes the angle of the pivotal bulk conveyor to the horizontal changes. The bulk material is picked out of the ship with the bucket conveyor, is then passed to the pivotal bulk conveyor and fed along the pivotal bulk conveyor to the outlet end thereof.

Abstract: The invention relates to a process for preparing alkylaluminoxanes immobilized on inert support materials from alkylaluminum compounds and water, which is characterized in that the reactants are metered with the gas stream into a fluidized-bed reactor and the reaction product is fixed on the support directly from the gas phase.

Abstract: The invention relates to a process for the preparation of aluminoxanes by addition of water to a solution of trialkylaluminum in an inert solvent, characterized in that the water required for the reaction is metered via a mixing nozzle into a static mixer, in particular a jet loop reactor.

Abstract: The invention concerns a method of preparing trialkyl-tin hydrides by a process that ensures outstanding long-term stability.Bis-[trialkyl-tin]oxides are dissolved in a solvent that mixes only to some extent, if at all, with water and converted with an aqueous solution of sodium borohydride stabilized with a base. The product is obtained by phase separation and optionally by distillation. The trialkyl-tin hydride is obtained almost quantitatively with a yield of more than 95%.

Abstract: Apparatus for semiconductor wafer manufacture in which a susceptor has an annular rotor for supporting a wafer substrate with a substrate surface facing downwards. The rotor has an annular flange overlying a body of the susceptor and the structure is such that a flow of rotor driving gas may be directed up from the body and against the flange while crystalline layers are being formed on the undersurface of the substrate.

Abstract: A container assembly for facilitating treatment of a viscous test specimen including a cylindrical container body with a cover defining on the interior side thereof a specimen recess for receiving a predetermined volume of specimen material. The specimen recess is defined by a generally cylindrical projecting part which fits into a cylindrical receiving space in the container in a manner whereby excess specimen material adhering to the periphery of the projecting part is automatically wiped from the cover and deposited in an annular space defined between the cover and the container which is sealed when the cover is in a closed position. A second cover may be provided at an opposite end of the container through which a helically formed homogenization rod may be inserted operative during subsequent agitation of the container to dislodge specimen material from the recess. The container may also be inserted directly into a centrifuge.

Abstract: An apparatus for checking gas analysis devices in respect of their sensitivity and their response and regeneration behaviour with respect to time, wherein a reproducible quantity of the measurement component is produced at a predetermined production rate, for a period of time which is guided entirely or at a constant proportion as a concentration pulse to the measurement element of the gas analysis device. For the production of the measurement component a chemical or electro-chemical reaction or even a thermal reaction is used. The time interval can then be conveniently controlled. A decisive advantage with toxic measurement components is that the gas production takes place in all cases for only a short time during the test procedure.

Abstract: A method for checking gas analysis devices in respect of their sensitivity and their response and regeneration behaviour with respect to time, wherein a reproducible quantity of the measurement component is produced at a predetermined production rate, for a period of time which is guided entirely or at a constant proportion as a concentration pulse to the measurement element of the gas analysis device. For the production of the measurement component a chemical or electro-chemical reaction or even a thermal reaction is used. The time interval can then be conveniently controlled. A decisive advantage with toxic measurement components is that the gas production takes place in all cases for only a short time during the test procedure.

Abstract: An electrochemical gas detector based on an electrolytic measurement cell having a normally solid organic electrolyte. The gas component to be detected diffuses out of the gas chamber at a three phase border (electrolyte-electrode-gas chamber) and there causes a change in the electrochemical equilibrium. As a result in an outer closing circuit a measurable electrical current is produced. The electrolyte consists of an anhydrous organic gel with a very low vapor pressure. The gas chamber adjacent to the three phase border constitutes a partly sealed cavity, which is in communication with the gas atmosphere to be examined via an absorption filter selectively permeable to the measurement component. The length of the cavity is dimensioned so as to be so short that practically no back diffusion of the measurement component through the filter takes place.

Abstract: In a method for determining the inorganic carbon content of aqueous liquids, the liquid sample together with a carbon dioxide free carrier gas is injected vertically from top to bottom in to a heated reaction chamber. The reaction chamber is filled with liquid phosphoric acid. The carbon dioxide generated in the reaction of the sample with the phosphoric acid is fed to a CO.sub.2 analyser. The reaction chamber is preferably heated to a temperature of approximately 140.degree. C.

Abstract: In a process for the removal of samples from flue gases or other highly concentrated exhaust gases, before the sample is removed from the main stream of exhaust gas it is diluted with a carrier gas which is free from this exhaust gas. The sample is diluted in the main stream of exhaust gas by a carrier gas introduced from outside. The diluted sample can then be analyzed in conventional gas analyzers.

Abstract: In the gas detector the gas stream to be investigated is conveyed past one of two electrodes of a measuring cell. The two electrodes are in contact with an electrolyte, wherein the electrolyte is an anhydrous organic gel. The gas component to be measured changes the electrochemical equilibrium at one of the two electrodes and produces thereby in the outer closing circuit a measurable electrical current which is a measure of the concentration of the gas component, to be detected.

Abstract: In a process for the determination of the inorganic carbon content of aqueous liquids, the sample to be examined, together with a carbon dioxide-free carrier gas, is introduced into a heated reaction chamber, where it is reacted with crystalline potassium bisulphate and/or a mixture of equal parts of potassium bisulphate and potassium sulphate to form carbon dioxide and water. The CO.sub.2 generated is analyzed quantitatively in a CO.sub.2 analyzer.

Abstract: In a process for determining the total mercury content in samples of effluent water, the sample is collected on a sample collector where it is evaporated at 1000.degree. C before it is decomposed in a pyrolysis zone at 1000.degree. to 1200.degree. C. The mercury in the liquid sample is thereby expelled as vapor and together with carrier gas it is conducted over a metal sheet which absorbs the mercury and concentrates it. The concentrated mercury is then expelled by heating the metal and transferred by the carrier gas into a mercury absorption photometer where it is determined quantitatively.

Abstract: In an apparatus for the discontinuous dosing of a constant quantity of fluid into an analysis device, the fluid feed system is connected by means of a three-way valve on the one hand via the dosing valve and a shut off valve arranged downstream and on the other hand via a by-pass to the fluid discharge system. A compressed air source for the production of a constant air pressure is connected between the three-way valve and the dosing valve. All the components of the system are controlled by a programme control unit, so that the fluid flow through the dosing valve is temporarily interrupted by closing the shut off valve and switching over the fluid feed to the by-pass and at the same time releasing the connection of the compressed air to the dosing valve. Thereafter the compressed air source is switched off by the control unit and the interruption of the fluid flow at the dosing valve is cancelled.