Abstract:
The invention concerns a method and corresponding fixed installations for the industrial, in particular continuous, production of moulded elements preferably in the form of sheets, consisting of substantially inorganic foams, in particular based on phosphate, from at least two substantially inorganic aqueous constituents. The invention is characterised in that the constituents are supplied from storage containers (5) or produced in a unit mixing raw materials (3) operating continuously, then continuously conveyed therefrom, in dosed amounts, to one or several units for mixing the constituents (7). After being briefly mixed, at most for 10 seconds, the resulting mixture of the two constituents is applied, during a next step, with a predetermined thickness, on a support (9a, 9b) or, in a predetermined amount, in a mould (9c), and the moulded element produced from said mixture, expanded and solidified, is subjected to a drying process.
Abstract:
The invention relates to a gas-generating and dispensing apparatus (10) for products such as multi-component foams. A gas-generating master container (25) forms the gas when material from trigger (24), i.e. potassium carbonate, combines with a charge of mild acid (50), i.e. citric acid. The gas pressurizes the material in the product-retaining master cylinder (26), forcing the materials that form the foam to exit through hoses (32) and out of the apparatus through dispensing gun (34).
Abstract:
System (10) for the simultaneous injection of a filling material into a plurality of separate chambers (11) of a boat comprising: - a first recipient (12) for containing and dosing a first reagent (A); - a second recipient (13) for containing and dosing a second reagent (B); - at least one first upstream transfer channel (14) of said first reagent to at least one first pump (15); - at least one second upstream transfer channel (16) of said second reagent to at least one second pump (17); - at least one first downstream transfer channel (18) of said first reagent (A) exiting from said at least one first pump (15); - at least one second downstream transfer channel (19) of said second reagent (B) exiting from said at least one second pump (17); wherein said at least one first downstream transfer channel (18) and said at least one second downstream transfer channel (19) of said second reagent exiting from said at least one second pump (17) converge in at least one mixing device (20) of said first reagent (A) and second reagent (B); an injector device (21) of said mixture of said first reagent (A) and second reagent (B) being provided for each of said chambers (11).
Abstract:
Ein Verfahren zur Herstellung von intumeszierenden Kunststoffformteilen, die aus einem Reaktionskunststoff bestehen, die intumeszierende Additive und Glasfasern enthalten, weist die folgenden Schritte auf: Bereitstellen einer Additivmischung aus den intumeszierenden Additiven und den Glasfasern, Vermischen der Additivmischung und der Komponenten des Kunststoffs, wobei eine homogene Masse erhalten wird, Einbringen der Masse aus den Komponenten des Kunststoffs und der Additivmischung in eine Form eingebracht, Aushärten und gegebenenfalls Aufschäumen der Masse. Die Erfindung betrifft des Weiteren eine Spritzgießanlage zur Durchführung dieses Verfahren sowie ein Kunststoffformteil, das mit diesem Verfahren hergestellt ist.
Abstract:
The invention relates to a process to foam a water-base adhesive wherein a gas is dissolved or generated under pressure in the water phase essentially without the formation of foam. To apply the adhesive in the form of foam, the pressurized adhesive is released through a valve onto a substrate at atmospheric pressure, whereby the dissolved gas separates as gas bubbles. The invention relates further to an apparatus for the implementation of said process comprising a pressure-tight container for the adhesive wherein an overpressure is provided through a first valve, and at the outlet of said container a drain valve is placed. The apparatus further comprises a pressure-tight acid vessel for the acid which is furnished with a second valve at its inlet The outlet of said vessel is connected through a third valve to the container.
Abstract:
A process for producing flexible polyurethane foams with the same production apparatus from: tolylene diisocyanate; two or three polyols at least two of which are selected from the group consisting of three polyoxyalkylene polyether polyols having a total degree of unsaturation less than 0.06 meq/g and three polymer polyols obtained from polyoxyalkylene polyether polyols having a total degree of unsaturation less than 0.06 meq/g; and a foaming agent. It comprises mixing the polyols, polyisocyanate, and foaming agent while changing the proportions of these to thereby produce flexible polyurethane foams each having desired material properties with respect to hardness, density, resilience, etc. In particular, the foams can be varied in density from 20 to 70 kg/m 3 and in 25% ILD hardness from 50 to 400 N/314 cm 2 .
Abstract:
The invention relates to a method for producing preferably plate-shaped moulded bodies from essentially organic, especially phosphate-based foam, consisting of at least two aqueous, essentially organic constituents which when mixed harden within a period of 10 seconds to 60 minutes at room temperature. The aim of the invention is to improve said method in such a way as to enable large quantities of plates and moulded parts consisting of inorganic light materials with densities of 0.04 g/cm to 0.95 g/cm to be produced preferably continuously, and to provide a stationary device for carrying out the method. To this end, the constituents are supplied from reserve containers (5) or are continuously produced in a raw materials mixer (3), and then continuously fed in metered quantities to one or several constituent mixers (7). After a brief mixing time (maximum 10 seconds), the mixture of the two constituents is placed on a support (9a, 9b), in which case said mixture is of a predetermined thickness, or placed in a mould (9c), in which case the mixture is of a predetermined quantity. Finally, the foamed, solid, moulded body produced from the mixture is subjected to a drying process.
Abstract:
A combination valve is disclosed which is useful in flash extrusion of polymer-liquid mixtures or polymer solutions. The combination valve comprises an automatically actuated main process fluid valve (13, 14) and an automatically actuated prime-flush valve (25, 26) in communication with the main process fluid channel (24) just downstream from the main process fluid valve. In operation the prime-flush valve is opened at start up to supply fluid under pressure to the main process fluid channel so that solvent does not evaporate and leave solid polymer to plug the system when the main process control valve is first opened. A shutdown, just as the main process control valve is being closed the prime-flush valve is opened to supply fluid to the system and remove polymer therefrom before it can solidify and plug the system thereby interfering with the next start up.