EP3840923B1 - Device for producing foamed construction materials - Google Patents

Device for producing foamed construction materials Download PDF

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Publication number
EP3840923B1
EP3840923B1 EP19758705.8A EP19758705A EP3840923B1 EP 3840923 B1 EP3840923 B1 EP 3840923B1 EP 19758705 A EP19758705 A EP 19758705A EP 3840923 B1 EP3840923 B1 EP 3840923B1
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EP
European Patent Office
Prior art keywords
gas
suspension
dispersion
temperature
volume flow
Prior art date
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Application number
EP19758705.8A
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German (de)
French (fr)
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EP3840923A1 (en
EP3840923C0 (en
Inventor
Holger Gawryck
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Individual
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/38—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions wherein the mixing is effected both by the action of a fluid and by directly-acting driven mechanical means, e.g. stirring means ; Producing cellular concrete
    • B28C5/381—Producing cellular concrete
    • B28C5/386—Plants; Systems; Methods
    • B28C5/388—Methods
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/08—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions using driven mechanical means affecting the mixing
    • B28C5/10—Mixing in containers not actuated to effect the mixing
    • B28C5/12—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers
    • B28C5/1238—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers for materials flowing continuously through the mixing device and with incorporated feeding or discharging devices
    • B28C5/1269—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers for materials flowing continuously through the mixing device and with incorporated feeding or discharging devices for making cellular concrete
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/29—Mixing systems, i.e. flow charts or diagrams
    • B01F23/291—Mixing systems, i.e. flow charts or diagrams for obtaining foams or aerosols
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/20—Measuring; Control or regulation
    • B01F35/21—Measuring
    • B01F35/211—Measuring of the operational parameters
    • B01F35/2113—Pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/20—Measuring; Control or regulation
    • B01F35/21—Measuring
    • B01F35/211—Measuring of the operational parameters
    • B01F35/2115—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/20—Measuring; Control or regulation
    • B01F35/22—Control or regulation
    • B01F35/2201—Control or regulation characterised by the type of control technique used
    • B01F35/2202—Controlling the mixing process by feed-back, i.e. a measured parameter of the mixture is measured, compared with the set-value and the feed values are corrected
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/80—Forming a predetermined ratio of the substances to be mixed
    • B01F35/82—Forming a predetermined ratio of the substances to be mixed by adding a material to be mixed to a mixture in response to a detected feature, e.g. density, radioactivity, consumed power or colour
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/80—Forming a predetermined ratio of the substances to be mixed
    • B01F35/83—Forming a predetermined ratio of the substances to be mixed by controlling the ratio of two or more flows, e.g. using flow sensing or flow controlling devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/38—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions wherein the mixing is effected both by the action of a fluid and by directly-acting driven mechanical means, e.g. stirring means ; Producing cellular concrete
    • B28C5/381—Producing cellular concrete
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
    • B28C7/02—Controlling the operation of the mixing
    • B28C7/022—Controlling the operation of the mixing by measuring the consistency or composition of the mixture, e.g. with supply of a missing component
    • B28C7/024—Controlling the operation of the mixing by measuring the consistency or composition of the mixture, e.g. with supply of a missing component by measuring properties of the mixture, e.g. moisture, electrical resistivity, density
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
    • B28C7/04—Supplying or proportioning the ingredients
    • B28C7/0404—Proportioning
    • B28C7/0418—Proportioning control systems therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C9/00—General arrangement or layout of plant
    • B28C9/002—Mixing systems, i.e. flow charts or diagrams; Making slurries; Involving methodical aspects; Involving pretreatment of ingredients; Involving packaging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
    • B01F2101/28—Mixing cement, mortar, clay, plaster or concrete ingredients

Definitions

  • the present invention relates to a device for producing foamed building materials according to the preamble of claim 1.
  • the inventor of the present invention has been developing and marketing devices for producing foamed building materials for many years. It has been shown that a system that is set to customer-specific default values on the inventor's premises, for example, delivers the desired result there, but can deliver a different result for a remote customer without the value entries having been changed.
  • a similar problem can occur at one and the same installation site of the device, for example if the ambient conditions in a production hall and/or the storage conditions of the components to be mixed change.
  • a device for producing foamed building materials which comprises a gas supply unit, a suspension supply unit and a mixing chamber. Using this device, the volume of the air inclusions and the pore size in the foamed building materials can be controlled in particular. Furthermore, the DE 10 2013 217149 A1 , the EP 3 076 839 B1 as well as the EP 1 669 183 A2 Methods and devices for producing and/or providing foams or foamed building materials.
  • the inventor of the present invention recognized on the one hand that the result of the device for producing foamed building materials depends to a large extent on the volume flows and to a lesser extent on the mass flows. In order to be able to ensure a uniform volume flow of each component with changing ambient conditions or input conditions of the components to be mixed, the respective effects of a change in ambient conditions or input conditions for the operation of the device for producing foamed building materials must be recorded and compensated.
  • the supplied masses and/or densities of gas and suspension can also be set, for example using determined target volumes, which are converted into target values for a mass flow to be set or target values for the density lead to the desired effect.
  • the inventor of the present invention has recognized that a measurement of, for example, the temperature and air pressure of the components to be mixed alone does not lead to maintaining the production result with changing environmental conditions or input conditions.
  • the inventor has recognized that during the mixing of the components in the mixing chamber, input energy can be introduced into the component mixture (also called "dispersion"), which also depends on the ambient conditions or the
  • Input conditions can be dependent and which was not considered in devices known from the prior art.
  • This invention is of course applicable to both continuous and discontinuous, for example clocked, devices.
  • gas metering can be continuous or discontinuous.
  • Mating in the mixing chamber can be carried out, for example, by blowing in, stirring, shaking, pouring, folding in and/or dissolving gas.
  • the means can be set up to detect a temperature of the dispersion in a region in which the dispersion leaves the mixing chamber and/or in which the dispersion leaves a conveying unit connected to the mixing chamber.
  • the expression "in one area” is intended to mean that the temperature of the dispersion can be recorded directly after mixing the components to be mixed, i.e. still in the mixing chamber, up to an outlet of the mixing chamber , where both a detection still inside the mixing chamber as well as outside of the mixing chamber is conceivable.
  • a delivery unit such as a pipe or hose
  • detection can also only be carried out at one end of this delivery unit, with both detection here again still conceivable within the conveyor unit and also outside the conveyor unit.
  • the device can also include a foam generation unit, which is located upstream of the mixing chamber and which is set up to mix the gas supplied by the gas supply unit with a liquid, resulting in the formation of a foam.
  • the foam can then be mixed with the suspension to be mixed in the mixing chamber, resulting in a foamed dispersion.
  • the foam can be based on at least one of enzymes, surfactants or proteins. The use of a foam generation unit can ensure that the gas and suspension are mixed evenly and with a predefined size of the gas inclusions in the dispersion.
  • the mixing chamber can be sealed from an external environment of the mixing chamber.
  • a “seal” in this sense means that only the components to be mixed, for example, as mentioned above, suspension and gas or foam, enter the mixing chamber. In this way, ambient air can be prevented from flowing into the mixing chamber, as is the case with open chambers. This can ensure that processes taking place in the mixing chamber can run unaffected by the surroundings of the mixing chamber.
  • the mixing chamber can be formed at a point at which the pipeline elements that convey the suspension or the gas/foam are brought together.
  • a stirring element which is arranged in the mixing chamber and is set up to mix the components to be mixed, can be set in such a way that it improves the material flow of the two components and/or the dispersion remains unchanged, i.e. has no effect on the volume flow.
  • the means for supplying values for a plurality of parameters can advantageously include at least one temperature sensor and/or one air pressure sensor.
  • the provision of sensors can automate the detection of a temperature and/or an air pressure.
  • a user of the device for producing foamed building materials had to send values, on the basis of which at least one temperature of the dispersion and/or an air pressure in the area surrounding the device could be determined, manually, for example using a keyboard, to the control and /or forward the control unit, the control and/or control unit can now receive these values directly from the sensors.
  • the provision of a temperature sensor and/or an air pressure sensor can enable a direct detection of a temperature and/or an air pressure instead of using values on the basis of which a temperature and/or an air pressure can be inferred.
  • the device can also comprise at least one further temperature sensor which is set up to measure a temperature of the suspension supplied by the suspension supply unit and/or of the gas supplied by the gas supply unit and/or of the foam introduced into the mixing chamber by the foam generation unit capture.
  • a temperature of the respective basic media which are to be mixed in the mixing chamber, i.e. the suspension and the gas or the foam
  • the device can also comprise a memory unit which is operatively coupled to the control and/or regulation unit and which is set up to store at least one value from a predetermined dispersion temperature and/or a predetermined gas temperature and/or a output a predetermined suspension temperature and/or a predetermined air pressure to the open-loop and/or closed-loop control unit.
  • the control and/or regulation unit can thus be provided with reference values, on the basis of which the control and/or regulation unit can automatically regulate the device, for example the volume flow of one of the components to be mixed.
  • the device can comprise at least one further pressure sensor which is set up to detect a system pressure during the introduction of gas and/or a pressure in a discharge space of the foamed dispersion.
  • system pressure during the introduction of gas is to be understood as meaning the pressure that prevails in the mixing chamber when the suspension is mixed with the gas or the foam.
  • pressure in a discharge space for the foamed dispersion is to be understood as meaning a space into which the foamed dispersion leaves the device for producing foamed building materials, for example in order to cure there.
  • the discharge space can be closed off or sealable from an environment surrounding the discharge space, or it can be in fluid communication with the environment.
  • the device can also include at least one mass flow sensor, in particular a calorimetric flow measuring device, which is set up to measure a mass flow of the supplied gas and/or a mass flow of the dispersion and/or a mass flow of the suspension and/or a mass flow of the supplied liquid and/or to detect a mass flow of the supplied foam.
  • a volume flow of a corresponding medium can also be determined on the basis of a detected mass flow, for example in combination with a detected temperature and/or a known gas constant, so that a direct detection of a volume flow is not required.
  • the detection of a mass flow and the use of elements suitable for this can have advantages with regard to an arrangement or installation space of these elements in the device for producing foamed building materials or with regard to costs.
  • the device can also comprise at least one volume flow sensor, which is set up to measure a volume flow of the supplied gas and/or a volume flow of the dispersion and/or a volume flow of the suspension and/or a volume flow of the supplied liquid and/or a volume flow of the to detect supplied foam.
  • at least one volume flow sensor which is set up to measure a volume flow of the supplied gas and/or a volume flow of the dispersion and/or a volume flow of the suspension and/or a volume flow of the supplied liquid and/or a volume flow of the to detect supplied foam.
  • the volume flow sensor can comprise one of an impeller sensor, a vortex flow measuring device, a variable area flow measuring device and a calorimetric flow measuring device.
  • the present invention relates to a method for producing foamed building materials, comprising the steps: providing a suspension using a suspension supply unit,
  • a respective reference value can make it possible to regulate the production process automatically using predefined parameters that are defined by the respective reference value.
  • Parameters can also be stored automatically as such a reference value or a plurality of such reference values, for example, by operating a method or a device for producing foamed building materials over a predefined period of time without corresponding input values being adjusted.
  • the last set input parameters that were set before the device was switched off can be stored as respective reference values.
  • a respective reference value and/or a respective instantaneous value can be normalized to predefined standard conditions before the step of comparing.
  • predefined standard conditions in order to be able to compare a value that has been specified for first environmental conditions or input conditions with a value that has been specified for second environmental conditions or input conditions that are different from the first, it may be necessary to compare the first value and/or or to normalize the second value to predefined standard conditions. It is conceivable that either conditions defining the first value or conditions defining the second value or conditions different from the conditions defining the first or the second value are used as a reference for these standard conditions.
  • the standard conditions include a predefined temperature and a predefined absolute air pressure to which the respective values are to be normalized.
  • FIG. 1 Schematically illustrated device for producing foamed building materials is generally designated by the reference numeral 10.
  • a gas such as compressed air
  • the gas inlet 12 is followed by a metering device 14, for example a valve, via which the amount of gas supplied can be regulated.
  • the gas then flows through a measuring device 16, which is set up here to record a volume flow Q of the gas. Of course, the measuring device 16 and then flow through the dosing device 14 .
  • the gas then enters a mixing chamber 18.
  • a suspension is fed into the device 10 at a suspension inlet 20 of the device 10 .
  • the suspension is in the in figure 1 illustrated embodiment conveyed using a metering pump 22 in the device 10. Downstream of the dosing pump 22, the suspension is conveyed into the mixing chamber 18 via a measuring device 24, which is set up to record a volume flow Q of the suspension and optionally a density p of the suspension.
  • the measuring device 24 could also be arranged in front of the dosing pump 22 here.
  • the device 10 also includes a foaming agent inlet 26 at which a foaming agent is fed into the device 10 .
  • the foaming agent also first passes through a metering device 28, such as a control valve, and then a measuring device 30, which is set up to record a volume flow Q of the foaming agent.
  • the foaming agent is then also introduced into the mixing chamber 18 .
  • a mixing element (not shown) is arranged in the mixing chamber 18 and can be set up both to generate a foam from the foaming agent and the gas and to generate a dispersion from the foaming agent/gas or foam and suspension.
  • the dispersion leaves the mixing chamber 18 at an outlet 32 of the mixing chamber 18, with a temperature measuring device 34 being set up to record a temperature T of the dispersion leaving the mixing chamber 18. Downstream of the temperature measuring device 34, the dispersion, which is in the form of a mineral foam, for example, is conveyed further depending on the customer-specific arrangement of the device 10, the dispersion naturally also having a density p and a volume flow Q having.
  • the measured values recorded by the measuring devices 16 , 24 , 30 , 34 are output to a control and/or regulation unit 36 .
  • an air pressure measuring device 38 detects an air pressure P present in the surroundings of the device 10 and outputs it to the open-loop and/or closed-loop control unit 36 .
  • the control and/or regulation unit 36 can then, for example on the basis of reference values, i.e.
  • the reference values can be stored in a storage unit 40 which is operationally connected to the control and/or regulation unit 36 .
  • FIG. 2 1 a second embodiment of an apparatus according to the invention, generally designated by the reference numeral 110.
  • FIG. The device 110 is essentially based on the device 10 according to FIG figure 1 . For this reason, components of the device 110 that are similar to the device 10 are provided with the same reference numbers, but increased by 100. At this point it should be explicitly mentioned that all the features and advantages of the device 10 can also be applied to the device 110 and vice versa. Accordingly, in the following only the differences between the device 110 and the device 10 are described.
  • the device 110 also includes a water inlet 142, via which water is fed into the device 110.
  • the water fed into the device 110 runs through a corresponding dosing device 144 and a measuring device 146, which is set up to record a volume flow Q of the water.
  • the water along with the foaming agent and gas enter a foam generator 148 where the water, foaming agent and gas are mixed to form a foam.
  • the foam generated in the foam generator 148 is then fed into a mixing chamber 118 .
  • the device 110 has a mixed water inlet 150, a binder inlet 152, an aggregate inlet 154 and an additive inlet 156 separately from one another.
  • the mixed water fed into device 110 via mixed water inlet 150 then runs through a metering device for mixed water 158, the binding agent fed into device 110 via binding agent inlet 152 passes through a metering device for binding agent 160, and the aggregates fed into device 110 via aggregate inlet 154 pass through a Metering device for additives 162 and the additives fed into the device 110 via the additive inlet 156 pass through a metering device for additives 164.
  • the mix water, binder, aggregate and additives then enter a slurry mixer 166 which is adapted to mix the mix water, binder, aggregate and additives Additives to produce a suspension.
  • the device or suspension mixer 166 can include at least one weighing device 168, which is set up to add a mass m of the mixed water and/or a mass m of the binder and/or a mass m of the aggregates and/or a mass m of the additives capture.
  • Weighing device 168 can forward the recorded values to a control and/or regulation unit 170 of suspension mixer 166, which, for example, calculates target values for the mass m of the mixed water and/or the mass m of the binder and/or the mass m of the aggregates and/or the Mass m of the additives are present, on the basis of which the metering devices 158, 160, 162, 164 can be controlled in order to adjust the recorded actual values to the stored target values.
  • the suspension produced in the suspension mixer 166 enters a buffer container 172 in which the suspension produced can be temporarily stored.
  • the suspension is then conveyed into the mixing chamber 118 via a metering pump 122 known from the device 10 via a measuring device 124 also known from the device 10 .
  • the foam is mixed with the suspension analogously to the description with reference to FIG figure 1 mixed to form a dispersion, the temperature T of which is recorded in a temperature measuring device 134 .
  • a control and/or regulation unit 136 of the device 110 also has a volume flow Q of the water fed into the device 110 via the water inlet 142 as an input variable. Accordingly, the control and/or regulation unit 136 is also set up to regulate the dosing device 144 for the water to be fed into the device 110 and thus the quantity of water fed into the device 110 .

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Accessories For Mixers (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)

Description

Die vorliegende Erfindung betrifft eine Vorrichtung zum Erzeugen von geschäumten Baustoffen gemäß dem Oberbegriff des Anspruchs 1.The present invention relates to a device for producing foamed building materials according to the preamble of claim 1.

Der Erfinder der vorliegenden Erfindung entwickelt und vertreibt seit vielen Jahren Vorrichtungen zum Erzeugen von geschäumten Baustoffen. Dabei hat sich gezeigt, dass eine Anlage, welche beispielsweise in den Räumlichkeiten des Erfinders auf kundenspezifische Vorgabewerte eingestellt wird, dort das gewünschte Ergebnis liefert, jedoch bei einem entfernt angesiedelten Kunden ein davon abweichendes Ergebnis liefern kann, ohne dass die Werteingaben verändert worden sind.The inventor of the present invention has been developing and marketing devices for producing foamed building materials for many years. It has been shown that a system that is set to customer-specific default values on the inventor's premises, for example, delivers the desired result there, but can deliver a different result for a remote customer without the value entries having been changed.

Ein ähnliches Problem kann an ein und demselben Aufstellungsort der Vorrichtung auftreten, beispielsweise wenn sich die Umgebungsbedingungen in einer Produktionshalle und/oder die Lagerbedingungen der zu mischenden Komponenten ändern.A similar problem can occur at one and the same installation site of the device, for example if the ambient conditions in a production hall and/or the storage conditions of the components to be mixed change.

Aus der WO 2008/139439 A2 , welche als nächstkommender Stand der Technik betrachtet wird, ist eine Vorrichtung zum Erzeugen von geschäumten Baustoffen bekannt, welche eine Gas-Zufuhreinheit, eine Suspensions-Zufuhreinheit und eine Mischkammer umfasst. Mittels dieser Vorrichtung kann insbesondere das Volumen der Lufteinschlüsse sowie die Porengröße in den geschäumten Baustoffen kontrolliert werden. Ferner offenbaren die DE 10 2013 217149 A1 , die EP 3 076 839 B1 sowie die EP 1 669 183 A2 Verfahren und Vorrichtungen zur Herstellung und/oder Bereitstellung von Schäumen oder geschäumten Baustoffen.From the WO 2008/139439 A2 , which is considered to be the closest prior art, a device for producing foamed building materials is known, which comprises a gas supply unit, a suspension supply unit and a mixing chamber. Using this device, the volume of the air inclusions and the pore size in the foamed building materials can be controlled in particular. Furthermore, the DE 10 2013 217149 A1 , the EP 3 076 839 B1 as well as the EP 1 669 183 A2 Methods and devices for producing and/or providing foams or foamed building materials.

Es ist daher die Aufgabe der folgenden Erfindung, eine Vorrichtung zum Erzeugen von geschäumten Baustoffen bereitzustellen, welche in der Lage ist, trotz sich verändernder Umgebungs- und/oder Eingangsbedingungen ein konstantes Ausgabeergebnis zu liefern.It is therefore the object of the following invention to provide a device for producing foamed building materials which is able is to deliver a constant output result despite changing environmental and/or input conditions.

Zur Lösung dieser Aufgabe wird eine Vorrichtung gemäß Anspruch 1 bereitgestellt.To solve this object, an apparatus according to claim 1 is provided.

Der Erfinder der vorliegenden Erfindung hat zum einen erkannt, dass das Ergebnis der Vorrichtung zum Erzeugen von geschäumten Baustoffen maßgeblich von den Volumenströmen und eher untergeordnet von den Masseströmen abhängt. Um nun bei sich verändernden Umgebungsbedingungen bzw. Eingangsbedingungen der zu mischenden Komponenten einen einheitlichen Volumenstrom einer jeden Komponente gewährleisten zu können, sind die jeweiligen Auswirkungen einer Veränderung von Umgebungsbedingungen bzw. Eingangsbedingungen für den Betrieb der Vorrichtung zum Erzeugen von geschäumten Baustoffen zu erfassen und zu kompensieren.The inventor of the present invention recognized on the one hand that the result of the device for producing foamed building materials depends to a large extent on the volume flows and to a lesser extent on the mass flows. In order to be able to ensure a uniform volume flow of each component with changing ambient conditions or input conditions of the components to be mixed, the respective effects of a change in ambient conditions or input conditions for the operation of the device for producing foamed building materials must be recorded and compensated.

Jedoch kann alternativ oder zusätzlich zu einem Einstellen der zugeführten Volumina auch ein Einstellen der zugeführten Massen und/oder Dichten von Gas und Suspension, beispielsweise unter Verwendung von ermittelten Soll-Volumina, welche in Sollwerte für einen einzustellenden Massestrom oder Sollwerte der Dichte umgerechnet werden, zu dem gewünschten Effekt führen.However, as an alternative or in addition to setting the supplied volumes, the supplied masses and/or densities of gas and suspension can also be set, for example using determined target volumes, which are converted into target values for a mass flow to be set or target values for the density lead to the desired effect.

Zum anderen hat der Erfinder der vorliegenden Erfindung erkannt, dass eine Messung von beispielsweise Temperatur und Luftdruck der zu mischenden Komponenten allein nicht zu einem Aufrechterhalten des Produktionsergebnisses bei sich verändernden Umgebungsbedingungen bzw. Eingangsbedingungen führt. Der Erfinder hat erkannt, dass während des Mischens der Komponenten in der Mischkammer eine Eintragsenergie in das Komponentengemisch (auch "Dispersion" genannt) eingebracht werden kann, welche ebenfalls von den Umgebungsbedingungen bzw.On the other hand, the inventor of the present invention has recognized that a measurement of, for example, the temperature and air pressure of the components to be mixed alone does not lead to maintaining the production result with changing environmental conditions or input conditions. The inventor has recognized that during the mixing of the components in the mixing chamber, input energy can be introduced into the component mixture (also called "dispersion"), which also depends on the ambient conditions or the

Eingangsbedingungen abhängig sein kann und welche bei aus dem Stand der Technik bekannten Vorrichtungen nicht beachtet wurde.Input conditions can be dependent and which was not considered in devices known from the prior art.

Erst eine Kombination einer Erfassung eines Luftdrucks, welcher insbesondere auf ein Gas vor und nach dem Mischen Auswirkungen hat, zusammen mit einer Erfassung einer Temperatur der Dispersion ermöglicht es, eine Kompensation von sich verändernden Umgebungsbedingungen und/oder Eingangsbedingungen der zu mischenden Komponenten verlässlich durchzuführen.Only a combination of detecting an air pressure, which affects a gas in particular before and after mixing, together with detecting a temperature of the dispersion makes it possible to reliably compensate for changing ambient conditions and/or input conditions of the components to be mixed.

Diese Erfindung ist natürlich sowohl auf kontinuierlich als auch auf diskontinuierlich, zum Beispiel getaktet, arbeitende Vorrichtungen anwendbar. Beispielsweise kann bei diesen Vorrichtungen eine Gasdosierung kontinuierlich oder diskontinuierlich sein.This invention is of course applicable to both continuous and discontinuous, for example clocked, devices. For example, in these devices, gas metering can be continuous or discontinuous.

Ein "Mischen" in der Mischkammer kann beispielsweise durch Einblasen, Rühren, Schütteln, Schütten, Unterheben, und/oder Gasentlösen durchgeführt werden."Mixing" in the mixing chamber can be carried out, for example, by blowing in, stirring, shaking, pouring, folding in and/or dissolving gas.

Vorteilhafterweise können die Mittel dazu eingerichtet sein, eine Temperatur der Dispersion in einem Bereich zu erfassen, in welchem die Dispersion die Mischkammer verlässt oder/und in welchem die Dispersion eine mit der Mischkammer verbundene Fördereinheit verlässt. Es sei direkt an dieser Stelle erwähnt, dass der Ausdruck "in einem Bereich" bedeuten soll, dass die Temperatur der Dispersion direkt nach einem Mischen der zu mischenden Komponenten, das heißt noch in der Mischkammer, bis hin zu einem Ausgang der Mischkammer erfasst werden kann, wobei hier sowohl eine Erfassung noch innerhalb der Mischkammer als auch außerhalb der Mischkammer denkbar ist. Für den Fall, dass der Ausgang der Mischkammer mit einer Fördereinheit, wie beispielsweise einem Rohr oder Schlauch, verbunden ist, kann eine Erfassung auch erst an einem Ende dieser Fördereinheit durchgeführt werden, wobei hier wieder sowohl eine Erfassung noch innerhalb der Fördereinheit als auch außerhalb der Fördereinheit denkbar ist.Advantageously, the means can be set up to detect a temperature of the dispersion in a region in which the dispersion leaves the mixing chamber and/or in which the dispersion leaves a conveying unit connected to the mixing chamber. It should be mentioned directly at this point that the expression "in one area" is intended to mean that the temperature of the dispersion can be recorded directly after mixing the components to be mixed, i.e. still in the mixing chamber, up to an outlet of the mixing chamber , where both a detection still inside the mixing chamber as well as outside of the mixing chamber is conceivable. In the event that the outlet of the mixing chamber is connected to a delivery unit, such as a pipe or hose, detection can also only be carried out at one end of this delivery unit, with both detection here again still conceivable within the conveyor unit and also outside the conveyor unit.

In einer Weiterbildung der vorliegenden Erfindung kann die Vorrichtung ferner eine Schaum-Erzeugungseinheit umfassen, welche der Mischkammer vorgelagert ist und welche dazu eingerichtet ist, das von der Gas-Zufuhreinheit zugeführte Gas mit einer Flüssigkeit zu vermischen, wodurch ein Schaum entsteht. In der Mischkammer kann dann der Schaum mit der zu mischenden Suspension vermengt werden, wodurch eine aufgeschäumte Dispersion entsteht. Der Schaum kann auf wenigstens einem aus Enzymen, Tensiden oder Eiweißen basieren. Durch die Verwendung einer Schaum-Erzeugungseinheit kann gewährleistet werden, dass eine Durchmischung von Gas und Suspension gleichmäßig und mit einer vordefinierten Größe der sich in der Dispersion befindlichen Gaseinschlüsse durchgeführt wird.In a further development of the present invention, the device can also include a foam generation unit, which is located upstream of the mixing chamber and which is set up to mix the gas supplied by the gas supply unit with a liquid, resulting in the formation of a foam. The foam can then be mixed with the suspension to be mixed in the mixing chamber, resulting in a foamed dispersion. The foam can be based on at least one of enzymes, surfactants or proteins. The use of a foam generation unit can ensure that the gas and suspension are mixed evenly and with a predefined size of the gas inclusions in the dispersion.

Die Mischkammer kann gegenüber einer äußeren Umgebung der Mischkammer abgedichtet sein. Unter einer "Abdichtung" in diesem Sinne ist zu verstehen, dass in die Mischkammer nur die zu mischenden Komponenten, beispielsweise, wie voranstehend erwähnt, Suspension und Gas bzw. Schaum, eintreten. Ein Einströmen von Umgebungsluft in die Mischkammer, wie bei offenen Kammern, kann auf diese Weise verhindert werden. Dies kann gewährleisten, dass in der Mischkammer stattfindende Prozesse von einer Umgebung der Mischkammer unbeeinflusst ablaufen können.The mixing chamber can be sealed from an external environment of the mixing chamber. A “seal” in this sense means that only the components to be mixed, for example, as mentioned above, suspension and gas or foam, enter the mixing chamber. In this way, ambient air can be prevented from flowing into the mixing chamber, as is the case with open chambers. This can ensure that processes taking place in the mixing chamber can run unaffected by the surroundings of the mixing chamber.

Beispielsweise kann die Mischkammer an einer Stelle gebildet sein, an welcher Rohrleitungselemente, welche die Suspension bzw. das Gas / den Schaum fördern, zusammengeführt sind.For example, the mixing chamber can be formed at a point at which the pipeline elements that convey the suspension or the gas/foam are brought together.

Ein Rührelement, welches in der Mischkammer angeordnet ist und dazu eingerichtet ist, die zu mischenden Komponenten zu vermischen, kann dabei so eingestellt sein, dass es den Materialfluss der beiden Komponenten und/oder der Dispersion unverändert belässt, das heißt keine Einwirkung auf deren Volumenstrom nimmt.A stirring element, which is arranged in the mixing chamber and is set up to mix the components to be mixed, can be set in such a way that it improves the material flow of the two components and/or the dispersion remains unchanged, i.e. has no effect on the volume flow.

Vorteilhafterweise können die Mittel zum Zuführen von Werten einer Mehrzahl von Parametern wenigstens einen Temperatursensor und/oder einen Luftdrucksensor umfassen. Das Vorsehen von Sensoren kann eine Erfassung einer Temperatur und/oder eines Luftdrucks automatisieren. Musste zuvor beispielsweise ein Benutzer der Vorrichtung zum Erzeugen von geschäumten Baustoffen Werte, auf deren Grundlage zumindest eine Temperatur der Dispersion und/oder ein Luftdruck in der Umgebung der Vorrichtung ermittelt werden konnte, manuell, zum Beispiel unter Verwendung einer Tastatur, an die Steuerungs- und/oder Regelungseinheit weiterleiten, so kann die Steuerungs- und/oder Regelungseinheit nun diese Werte direkt von den Sensoren erhalten. Ferner kann das Bereitstellen eines Temperatursensors und/oder eines Luftdrucksensors eine direkte Erfassung einer Temperatur und/oder eines Luftdrucks ermöglichen, anstatt Werte zu verwenden, auf deren Grundlage auf eine Temperatur und/oder einen Luftdruck rückgeschlossen werden kann.The means for supplying values for a plurality of parameters can advantageously include at least one temperature sensor and/or one air pressure sensor. The provision of sensors can automate the detection of a temperature and/or an air pressure. Previously, for example, a user of the device for producing foamed building materials had to send values, on the basis of which at least one temperature of the dispersion and/or an air pressure in the area surrounding the device could be determined, manually, for example using a keyboard, to the control and /or forward the control unit, the control and/or control unit can now receive these values directly from the sensors. Furthermore, the provision of a temperature sensor and/or an air pressure sensor can enable a direct detection of a temperature and/or an air pressure instead of using values on the basis of which a temperature and/or an air pressure can be inferred.

Die Vorrichtung kann ferner wenigstens einen weiteren Temperatursensor umfassen, welcher dazu eingerichtet ist, eine Temperatur der von der Suspensions-Zufuhreinheit zugeführten Suspension und/oder des von der Gas-Zufuhreinheit zugeführten Gases und/oder des von der Schaum-Erzeugungseinheit in die Mischkammer eingebrachten Schaums zu erfassen. Durch eine Erfassung einer Temperatur der jeweiligen Grundmedien, welche in der Mischkammer zu mischen sind, das heißt der Suspension und des Gases bzw. des Schaums, kann es möglich sein, eine jeweilige SollTemperatur festzulegen und unter Verwendung entsprechender Einrichtungen diese Komponenten vor einem Eintreten in die Mischkammer zu temperieren, das heißt zu erwärmen oder zu kühlen, so dass die Grundmedien in die Mischkammer bereits mit der vordefinierten Temperatur eintreten.The device can also comprise at least one further temperature sensor which is set up to measure a temperature of the suspension supplied by the suspension supply unit and/or of the gas supplied by the gas supply unit and/or of the foam introduced into the mixing chamber by the foam generation unit capture. By detecting a temperature of the respective basic media, which are to be mixed in the mixing chamber, i.e. the suspension and the gas or the foam, it may be possible to set a respective target temperature and using appropriate devices these components before entering the To temper the mixing chamber, that is to heat or cool, so that the basic media already enter the mixing chamber at the predefined temperature.

In einer Weiterbildung der vorliegenden Erfindung kann die Vorrichtung ferner eine Speichereinheit umfassen, welche mit der Steuerungs- und/oder Regelungseinheit betriebsmäßig gekoppelt ist, und welche dazu eingerichtet ist, wenigstens einen Wert aus einer vorbestimmten Dispersionstemperatur und/oder einer vorbestimmten Gastemperatur und/oder einer vorbestimmten Suspensionstemperatur und/oder einem vorbestimmten Luftdruck an die Steuerungs- und/oder Regelungseinheit auszugeben. Der Steuerungs- und/oder Regelungseinheit können somit Referenzwerte bereitgestellt werden, auf deren Grundlage die Steuerungs- und/oder Regelungseinheit automatisch eine Regelung der Vorrichtung, beispielsweise des Volumenstroms einer der zu mischenden Komponenten, durchführen kann.In a further development of the present invention, the device can also comprise a memory unit which is operatively coupled to the control and/or regulation unit and which is set up to store at least one value from a predetermined dispersion temperature and/or a predetermined gas temperature and/or a output a predetermined suspension temperature and/or a predetermined air pressure to the open-loop and/or closed-loop control unit. The control and/or regulation unit can thus be provided with reference values, on the basis of which the control and/or regulation unit can automatically regulate the device, for example the volume flow of one of the components to be mixed.

Ferner kann die Vorrichtung wenigstens einen weiteren Drucksensor umfassen, welcher dazu eingerichtet ist, einen Systemdruck während eines Gaseintrags und/oder einen Druck in einem Austragungsraum der geschäumten Dispersion zu erfassen. Unter dem "Systemdruck während eines Gaseintrags" ist der Druck zu verstehen, welcher in der Mischkammer herrscht, wenn die Suspension mit dem Gas bzw. dem Schaum vermischt wird. Unter dem "Druck in einem Austragungsraum der geschäumten Dispersion" ist ein Raum zu verstehen, in welchen hinein die schäumte Dispersion die Vorrichtung zum Erzeugen von geschäumten Baustoffen verlässt, beispielsweise um dort auszuhärten. Der Austragungsraum kann dabei gegenüber einer Umgebung, welche den Austragungsraum umgibt, abgeschlossen oder abdichtbar sein oder mit der Umgebung in Fluidverbindung stehen.Furthermore, the device can comprise at least one further pressure sensor which is set up to detect a system pressure during the introduction of gas and/or a pressure in a discharge space of the foamed dispersion. The "system pressure during the introduction of gas" is to be understood as meaning the pressure that prevails in the mixing chamber when the suspension is mixed with the gas or the foam. The “pressure in a discharge space for the foamed dispersion” is to be understood as meaning a space into which the foamed dispersion leaves the device for producing foamed building materials, for example in order to cure there. The discharge space can be closed off or sealable from an environment surrounding the discharge space, or it can be in fluid communication with the environment.

Die Vorrichtung kann ferner wenigstens einen Massenstromsensor, insbesondere eine kalorimetrische Durchflussmesseinrichtung, umfassen, welcher dazu eingerichtet ist, einen Massenstrom des zugeführten Gases und/oder einen Massenstrom der Dispersion und/oder einen Massenstrom der Suspension und/oder einen Massenstrom der zugeführten Flüssigkeit und/oder einen Massenstrom des zugeführten Schaums zu erfassen. Auch auf Grundlage eines erfassten Massenstroms, zum Beispiel in Kombination mit einer erfassten Temperatur und/oder einer bekannten Gaskonstante, kann ein Volumenstrom eines entsprechenden Mediums ermittelt werden, so dass es nicht einer direkten Erfassung eines Volumenstroms bedarf. Die Erfassung eines Massenstroms und die Verwendung von dazu geeigneten Elementen kann Vorteile in Bezug auf eine Anordnung bzw. einen Bauraum dieser Elemente in der Vorrichtung zum Erzeugen von geschäumten Baustoffen oder in Bezug auf Kosten aufweisen.The device can also include at least one mass flow sensor, in particular a calorimetric flow measuring device, which is set up to measure a mass flow of the supplied gas and/or a mass flow of the dispersion and/or a mass flow of the suspension and/or a mass flow of the supplied liquid and/or to detect a mass flow of the supplied foam. A volume flow of a corresponding medium can also be determined on the basis of a detected mass flow, for example in combination with a detected temperature and/or a known gas constant, so that a direct detection of a volume flow is not required. The detection of a mass flow and the use of elements suitable for this can have advantages with regard to an arrangement or installation space of these elements in the device for producing foamed building materials or with regard to costs.

Alternativ oder zusätzlich kann die Vorrichtung ferner wenigstens einen Volumenstromsensor umfassen, welcher dazu eingerichtet ist, einen Volumenstrom des zugeführten Gases und/oder einen Volumenstrom der Dispersion und/oder einen Volumenstrom der Suspension und/oder einen Volumenstrom der zugeführten Flüssigkeit und/oder einen Volumenstrom des zugeführten Schaums zu erfassen. Auf diese Weise kann ein jeweiliger Volumenstrom direkt erfasst werden, ohne diesen auf Grundlage von wenigstens einer anderen Eigenschaft des jeweiligen Mediums ermitteln zu müssen.Alternatively or additionally, the device can also comprise at least one volume flow sensor, which is set up to measure a volume flow of the supplied gas and/or a volume flow of the dispersion and/or a volume flow of the suspension and/or a volume flow of the supplied liquid and/or a volume flow of the to detect supplied foam. In this way, a respective volume flow can be recorded directly without having to determine it on the basis of at least one other property of the respective medium.

Dabei kann der Volumenstromsensor eines umfassen aus einem Flügelrad-Sensor, einer Vortex-Durchflussmesseinrichtung, einer Schwebekörper-Durchflussmesseinrichtung und einer kalorimetrischen Durchflussmesseinrichtung.In this case, the volume flow sensor can comprise one of an impeller sensor, a vortex flow measuring device, a variable area flow measuring device and a calorimetric flow measuring device.

In einem weiteren Aspekt betrifft die vorliegende Erfindung ein Verfahren zum Erzeugen von geschäumten Baustoffen, umfassend die Schritte: Bereitstellen einer Suspension unter Verwendung einer Suspensions-Zufuhreinheit,In a further aspect, the present invention relates to a method for producing foamed building materials, comprising the steps: providing a suspension using a suspension supply unit,

Bereitstellen eines Gases unter Verwendung einer Gas-Zufuhreinheit, und Mischen der Suspension und des Gases zu einer Dispersion in einer Mischkammer

  • dadurch gekennzeichnet, dass das Verfahren ferner die Schritte umfasst: Erfassen einer Temperatur der Dispersion
  • Erfassen eines Umgebungsluftdrucks,
  • Übermitteln der erfassten Temperatur der Dispersion und des erfassten Umgebungsluftdrucks an eine Steuerungs- und/oder Regelungseinheit, Einstellen von wenigstens einem aus einem Volumenstrom des Gases, einer Masse des Gases, einer Temperatur des Gases, einem Druck des Gases, einem Volumenstrom der Suspension, einer Masse (m) der Suspension und einer Dichte der Suspension durch die Steuerungs- und/oder Regelungseinheit auf Grundlage der erfassten Temperatur der Dispersion und des erfassten Umgebungsluftdrucks.
providing a gas using a gas supply unit, and mixing the suspension and gas into a dispersion in a mixing chamber
  • characterized in that the method further comprises the steps of: detecting a temperature of the dispersion
  • detecting an ambient air pressure,
  • Transmitting the detected temperature of the dispersion and the detected ambient air pressure to a control and/or regulation unit, setting at least one of a volume flow of the gas, a mass of the gas, a temperature of the gas, a pressure of the gas, a volume flow of the suspension, one Mass (m) of the suspension and a density of the suspension by the control and/or regulation unit based on the detected temperature of the dispersion and the detected ambient air pressure.

Es sei bereits an dieser Stelle darauf hingewiesen, dass sämtliche Merkmale und Vorteile der oben beschriebenen Vorrichtung zum Erzeugen von geschäumten Baustoffen ebenso auf das Verfahren zum Erzeugen von geschäumten Baustoffen anwendbar sind und umgekehrt.It should already be pointed out at this point that all the features and advantages of the device described above for producing foamed building materials can also be applied to the method for producing foamed building materials and vice versa.

Das Verfahren kann ferner die Schritte umfassen:

  • Bereitstellen wenigstens eines Referenzwerts aus einer Speichereinheit an die Steuerungs- und/oder Regelungseinheit,
  • wobei der Referenzwert wenigstens eines anzeigt aus einer Temperatur und/oder einem Druck und/oder einem Volumenstrom der Dispersion und/oder einer Temperatur und/oder einem Druck und/oder einem Volumenstrom des Gases und/oder einer Temperatur und/oder einem Druck und/oder einem Volumenstrom der Suspension
  • Vergleichen eines momentan erfassten Werts mit einem zugehörigen Referenzwert, und
  • Einstellen einer einem jeweiligen Wert zugeordneten Einrichtung und/oder Einheit und/oder Vorrichtung derart, dass sich ein momentaner Wert dem zugehörigen Referenzwert annähert.
The method may further include the steps:
  • providing at least one reference value from a storage unit to the open-loop and/or closed-loop control unit,
  • wherein the reference value indicates at least one of a temperature and/or a pressure and/or a volumetric flow of the dispersion and/or a temperature and/or a pressure and/or a volumetric flow of the gas and/or a temperature and/or a pressure and/or or a volume flow of the suspension
  • comparing a currently detected value with an associated reference value, and
  • Setting a device and/or unit and/or device assigned to a respective value in such a way that a current value approaches the associated reference value.

Wie bereits oben in Bezug auf die Vorrichtung zum Erzeugen von geschäumten Baustoffen erwähnt, kann ein Bereitstellen eines jeweiligen Referenzwerts ermöglichen, eine Regelung des Produktionsverfahrens automatisch anhand von vordefinierten und durch den jeweiligen Referenzwert festgelegten Parametern zu regeln. Eine Speicherung von Parametern als ein solcher Referenzwert bzw. eine Mehrzahl solcher Referenzwerte kann beispielsweise ebenfalls automatisch dadurch erfolgen, dass ein Verfahren oder eine Vorrichtung zum Erzeugen von geschäumten Baustoffen über einen vordefinierten Zeitraum betrieben wird, ohne dass entsprechende Eingabewerte angepasst werden. Ferner können als jeweilige Referenzwerte die zuletzt eingestellten Eingangsparameter gespeichert werden, welche vor einem Abschalten der Vorrichtung eingestellt worden sind.As already mentioned above in relation to the device for generating foamed building materials mentioned, the provision of a respective reference value can make it possible to regulate the production process automatically using predefined parameters that are defined by the respective reference value. Parameters can also be stored automatically as such a reference value or a plurality of such reference values, for example, by operating a method or a device for producing foamed building materials over a predefined period of time without corresponding input values being adjusted. Furthermore, the last set input parameters that were set before the device was switched off can be stored as respective reference values.

Natürlich kann ein jeweiliger Referenzwert und/oder ein jeweiliger momentaner Wert vor dem Schritt des Vergleichens auf vordefinierte Normbedingungen normiert werden. Um beispielsweise einen Wert, welcher bei ersten Umgebungsbedingungen bzw. Eingangsbedingungen festgelegt worden ist, mit einem Wert vergleichen zu können, welcher bei zweiten, von den ersten verschiedenen, Umgebungsbedingungen bzw. Eingangsbedingungen festgelegt worden ist, kann es notwendig sein, den ersten Wert und/oder den zweiten Wert auf vordefinierte Normbedingungen zu normieren. Dabei ist es denkbar, dass entweder den ersten Wert definierende Bedingungen oder den zweiten Wert definierende Bedingungen oder von den den ersten bzw. den zweiten Wert definierenden Bedingungen verschiedene Bedingungen als Bezug für diese Normbedingungen verwendet werden. Insbesondere umfassen die Normbedingungen eine vordefinierte Temperatur und einen vordefinierten absoluten Luftdruck, auf welche die jeweiligen Werte zu normieren sind.Of course, a respective reference value and/or a respective instantaneous value can be normalized to predefined standard conditions before the step of comparing. For example, in order to be able to compare a value that has been specified for first environmental conditions or input conditions with a value that has been specified for second environmental conditions or input conditions that are different from the first, it may be necessary to compare the first value and/or or to normalize the second value to predefined standard conditions. It is conceivable that either conditions defining the first value or conditions defining the second value or conditions different from the conditions defining the first or the second value are used as a reference for these standard conditions. In particular, the standard conditions include a predefined temperature and a predefined absolute air pressure to which the respective values are to be normalized.

In der Fachwelt hat sich dabei als gängig herausgebildet, dass eine Volumenangabe der Normbedingungen in Normlitern NL bei 0°C und einem absoluten Luftdruck von 1013,25 mbar erfolgt. Dies entspricht beispielsweise auch der DIN 1343.In the professional world, it has become common practice to state the volume of the standard conditions in standard liters NL at 0°C and an absolute air pressure of 1013.25 mbar. This corresponds to example also DIN 1343.

Wie allgemein bekannt, wirkt sich eine Änderung der Temperatur oder eine Änderung des Luftdrucks auf das Volumen von gasförmigen Medien deutlich stärker aus als auf das Volumen von flüssigen Medien. Aus diesem Grund ist die voranstehend erwähnte Normbedingungen bei 0°C und einem absoluten Luftdruck von 1013,25 mbar insbesondere auf gasförmige Medien anzuwenden. Bei Flüssigkeiten hat sich in der Fachwelt sowohl eine Normierung auf 0°C als auch eine Normierung auf 20°C etabliert.As is well known, a change in temperature or a change in air pressure has a much greater effect on the volume of gaseous media than on the volume of liquid media. For this reason, the standard conditions mentioned above at 0°C and an absolute air pressure of 1013.25 mbar are to be applied in particular to gaseous media. In the case of liquids, both a normalization at 0°C and a normalization at 20°C have become established in the professional world.

Im Folgenden wird die vorliegende Erfindung anhand von Ausführungsbeispielen in Bezug auf die begleitenden Zeichnungen in größerem Detail näher beschrieben werden, in welchen:

Figur 1
einen schematischen Aufbau einer ersten Ausführungsform einer erfindungsgemäßen Vorrichtung zum Erzeugen von geschäumten Baustoffen zeigt;
Figur 2
ein schematischen Aufbau einer zweiten Ausführungsform einer erfindungsgemäßen Vorrichtung zum Erzeugen von geschäumten Baustoffen zeigt.
In the following, the present invention will be described in more detail by means of exemplary embodiments with reference to the accompanying drawings, in which:
figure 1
shows a schematic structure of a first embodiment of a device according to the invention for producing foamed building materials;
figure 2
shows a schematic structure of a second embodiment of a device according to the invention for producing foamed building materials.

Die in Figur 1 schematisch dargestellte Vorrichtung zum Erzeugen von geschäumten Baustoffen ist allgemein mit dem Bezugszeichen 10 bezeichnet.In the figure 1 Schematically illustrated device for producing foamed building materials is generally designated by the reference numeral 10.

An einem Gaseingang 12 wird in die Vorrichtung 10 ein Gas eingespeist, wie beispielsweise Druckluft. Dem Gaseingang 12 folgt eine Dosiereinrichtung 14, beispielsweise ein Ventil, über welches die Menge des zugeführten Gases geregelt werden kann. Im Anschluss durchströmt das Gas eine Messeinrichtung 16, welche hier dazu eingerichtet ist, einen Volumenstrom Q des Gases zu erfassen. Natürlich könnte auch zuerst die Messeinrichtung 16 und danach die Dosiereinrichtung 14 durchströmt werden. Danach gelangt das Gas in eine Mischkammer 18.A gas, such as compressed air, is fed into the device 10 at a gas inlet 12 . The gas inlet 12 is followed by a metering device 14, for example a valve, via which the amount of gas supplied can be regulated. The gas then flows through a measuring device 16, which is set up here to record a volume flow Q of the gas. Of course, the measuring device 16 and then flow through the dosing device 14 . The gas then enters a mixing chamber 18.

An einem Suspensionseingang 20 der Vorrichtung 10 wird in die Vorrichtung 10 eine Suspension eingespeist. Die Suspension wird in dem in Figur 1 dargestellten Ausführungsbeispiel unter Verwendung einer Dosierpumpe 22 in die Vorrichtung 10 gefördert. Nach der Dosierpumpe 22 wird die Suspension über eine Messeinrichtung 24, welche dazu eingerichtet ist, einen Volumenstrom Q der Suspension sowie optional eine Dichte p der Suspension zu erfassen, in die Mischkammer 18 gefördert. Hier könnte alternativ auch die Messeinrichtung 24 vor der Dosierpumpe 22 angeordnet sein.A suspension is fed into the device 10 at a suspension inlet 20 of the device 10 . The suspension is in the in figure 1 illustrated embodiment conveyed using a metering pump 22 in the device 10. Downstream of the dosing pump 22, the suspension is conveyed into the mixing chamber 18 via a measuring device 24, which is set up to record a volume flow Q of the suspension and optionally a density p of the suspension. Alternatively, the measuring device 24 could also be arranged in front of the dosing pump 22 here.

In der hier dargestellten Ausführungsform umfasst die Vorrichtung 10 ferner einen Schaumbildner-Eingang 26, an welchem ein Schaumbildner in die Vorrichtung 10 eingespeist wird. Auch der Schaumbildner durchtritt zunächst eine Dosiereinrichtung 28, wie beispielsweise ein Regelventil, und anschließend eine Messeinrichtung 30, welche dazu eingerichtet ist, einen Volumenstrom Q des Schaumbildners zu erfassen. Anschließend wird auch der Schaumbildner in die Mischkammer 18 eingeführt.In the embodiment shown here, the device 10 also includes a foaming agent inlet 26 at which a foaming agent is fed into the device 10 . The foaming agent also first passes through a metering device 28, such as a control valve, and then a measuring device 30, which is set up to record a volume flow Q of the foaming agent. The foaming agent is then also introduced into the mixing chamber 18 .

In der Mischkammer 18 ist ein nicht dargestelltes Mischelement angeordnet, welches sowohl dazu eingerichtet sein kann, aus dem Schaumbildner und dem Gas einen Schaum zu erzeugen, als auch aus Schaumbildner / Gas bzw. Schaum und Suspension eine Dispersion zu erzeugen. Die Dispersion verlässt die Mischkammer 18 an einem Ausgang 32 der Mischkammer 18, wobei eine Temperaturmesseinrichtung 34 dazu eingerichtet ist, eine Temperatur T der die Mischkammer 18 verlassenden Dispersion zu erfassen. Nach der Temperaturmesseinrichtung 34 wird die Dispersion, welche beispielsweise als ein Mineralschaum ausgebildet ist, je nach kundenspezifischer Anordnung der Vorrichtung 10 weiter befördert, wobei die Dispersion natürlich ebenfalls eine Dichte p und einen Volumenstrom Q aufweist.A mixing element (not shown) is arranged in the mixing chamber 18 and can be set up both to generate a foam from the foaming agent and the gas and to generate a dispersion from the foaming agent/gas or foam and suspension. The dispersion leaves the mixing chamber 18 at an outlet 32 of the mixing chamber 18, with a temperature measuring device 34 being set up to record a temperature T of the dispersion leaving the mixing chamber 18. Downstream of the temperature measuring device 34, the dispersion, which is in the form of a mineral foam, for example, is conveyed further depending on the customer-specific arrangement of the device 10, the dispersion naturally also having a density p and a volume flow Q having.

Die von den Messeinrichtungen 16, 24, 30, 34 erfassten Messwerte werden an eine Steuerungs- und/oder Regelungseinheit 36 ausgegeben. Ferner wird von einer Luftdruckmesseinrichtung 38 ein Luftdruck P, welcher in einer Umgebung der Vorrichtung 10 vorliegt, erfasst und an die Steuerungs- und/oder Regelungseinheit 36 ausgegeben. Die Steuerungs- und/oder Regelungseinheit 36 kann dann, beispielsweise auf Grundlage von Referenzwerten, das heißt zum Beispiel Sollwerten bezüglich der Dichte p der Dispersion, der Dichte p des Schaums, eines Volumenstroms Q der Dispersion und/oder einer Konzentration C des Schaumbildners, welche beispielsweise in Prozent oder in Kilogramm pro Kubikmeter gemessen wird, eine Regelung einer jeweiligen Dosiereinrichtung 14, 22, 28 durchführen, um ein Ist-Ergebnis einem Soll-Ergebnis anzunähern. Die Referenzwerte können dabei in einer Speichereinheit 40 hinterlegt sein, welche mit der Steuerungs- und/oder Regelungseinheit 36 betriebsmäßig verbunden ist.The measured values recorded by the measuring devices 16 , 24 , 30 , 34 are output to a control and/or regulation unit 36 . Furthermore, an air pressure measuring device 38 detects an air pressure P present in the surroundings of the device 10 and outputs it to the open-loop and/or closed-loop control unit 36 . The control and/or regulation unit 36 can then, for example on the basis of reference values, i.e. for example target values with regard to the density p of the dispersion, the density p of the foam, a volume flow Q of the dispersion and/or a concentration C of the foaming agent, which is measured, for example, in percent or in kilograms per cubic meter, perform a regulation of a respective dosing device 14, 22, 28 in order to approximate an actual result to a target result. The reference values can be stored in a storage unit 40 which is operationally connected to the control and/or regulation unit 36 .

Unter Verwendung der in Figur 1 gezeigten Vorrichtung 10 ist es möglich, unabhängig von einem in einer Umgebung der Vorrichtung 10 herrschenden Luftdruck oder von Parametern der zu mischenden Komponenten eine Dispersion zu erzeugen, welche eine vorbestimmte Dichte p und einen vorbestimmten Volumenstrom Q, auf Grundlage der erfindungsgemäßen Reglung, aufweist.Using the in figure 1 With the device 10 shown, it is possible to generate a dispersion which has a predetermined density p and a predetermined volume flow Q, based on the regulation according to the invention, independently of an air pressure prevailing in an area surrounding the device 10 or of parameters of the components to be mixed.

In Figur 2 ist eine zweite Ausführungsform einer erfindungsgemäßen Vorrichtung gezeigt, welche allgemein mit dem Bezugszeichen 110 versehen ist. Die Vorrichtung 110 basiert im Wesentlichen auf der Vorrichtung 10 gemäß Figur 1. Aus diesem Grund sind zu der Vorrichtung 10 ähnliche Komponenten der Vorrichtung 110 mit gleichen Bezugszeichen versehen, jedoch erhöht um 100. An dieser Stelle sei explizit erwähnt, dass sämtliche Merkmale und Vorteile der Vorrichtung 10 auch auf die Vorrichtung 110 anwendbar sind und umgekehrt. Entsprechend werden im Folgenden lediglich die Unterschiede der Vorrichtung 110 zu der Vorrichtung 10 beschrieben werden.In figure 2 1 is shown a second embodiment of an apparatus according to the invention, generally designated by the reference numeral 110. FIG. The device 110 is essentially based on the device 10 according to FIG figure 1 . For this reason, components of the device 110 that are similar to the device 10 are provided with the same reference numbers, but increased by 100. At this point it should be explicitly mentioned that all the features and advantages of the device 10 can also be applied to the device 110 and vice versa. Accordingly, in the following only the differences between the device 110 and the device 10 are described.

Neben den aus der Vorrichtung 10 bekannten Elementen umfasst die Vorrichtung 110 ferner einen Wassereingang 142, über welchen Wasser in die Vorrichtung 110 eingespeist wird. Das in die Vorrichtung 110 eingespeiste Wasser durchläuft eine entsprechende Dosiereinrichtung 144 und eine Messeinrichtung 146, welche dazu eingerichtet ist, einen Volumenstrom Q des Wassers zu erfassen. Das Wasser tritt zusammen mit dem Schaumbildner und dem Gas (siehe Beschreibung zur Vorrichtung 10) in einen Schaumgenerator 148 ein, in welchem das Wasser, der Schaumbildner und das Gas zu einem Schaum vermischt werden.In addition to the elements known from the device 10, the device 110 also includes a water inlet 142, via which water is fed into the device 110. The water fed into the device 110 runs through a corresponding dosing device 144 and a measuring device 146, which is set up to record a volume flow Q of the water. The water along with the foaming agent and gas (see description of apparatus 10) enter a foam generator 148 where the water, foaming agent and gas are mixed to form a foam.

Der im Schaumgenerator 148 erzeugte Schaum wird anschließend in eine Mischkammer 118 eingespeist.The foam generated in the foam generator 148 is then fed into a mixing chamber 118 .

Anstelle des Suspensionseingangs 20 der Vorrichtung 10 weist die Vorrichtung 110 voneinander getrennt einen Mischwassereingang 150, einen Bindemitteleingang 152, einen Zuschlagstoffeingang 154 und einen Additiveingang 156 auf. Anschließend durchläuft das über den Mischwassereingang 150 in die Vorrichtung 110 eingespeiste Mischwasser eine Dosiereinrichtung für Mischwasser 158, das über den Bindemitteleingang 152 in die Vorrichtung 110 eingespeiste Bindemittel durchläuft eine Dosiereinrichtung für Bindemittel 160, die über den Zuschlagstoffeingang 154 in die Vorrichtung 110 eingespeisten Zuschlagstoffe durchlaufen eine Dosiereinrichtung für Zuschlagstoffe 162 und die über den Additiveingang 156 in die Vorrichtung 110 eingespeisten Additive durchlaufen eine Dosiereinrichtung für Additive 164.Instead of the suspension inlet 20 of the device 10, the device 110 has a mixed water inlet 150, a binder inlet 152, an aggregate inlet 154 and an additive inlet 156 separately from one another. The mixed water fed into device 110 via mixed water inlet 150 then runs through a metering device for mixed water 158, the binding agent fed into device 110 via binding agent inlet 152 passes through a metering device for binding agent 160, and the aggregates fed into device 110 via aggregate inlet 154 pass through a Metering device for additives 162 and the additives fed into the device 110 via the additive inlet 156 pass through a metering device for additives 164.

Das Mischwasser, das Bindemittel, die Zuschlagstoffe und die Additive treten dann in einen Suspensionsmischer 166 ein, welcher dazu eingerichtet ist, aus dem Mischwasser, dem Bindemittel, den Zuschlagstoffen und den Additiven eine Suspension zu erzeugen. Die Vorrichtung bzw. der Suspensionsmischer 166 kann dabei wenigstens eine Wägeeinrichtung 168 umfassen, welche dazu eingerichtet ist, eine Masse m des Mischwassers und/oder eine Masse m des Bindemittels und/oder eine Masse m der Zuschlagstoffe und/oder eine Masse m der Additive zu erfassen. Die Wägeeinrichtung 168 kann die erfassten Werte an eine Steuerungs- und/oder Regelungseinheit 170 des Suspensionsmischers 166 weitergeben, welcher beispielsweise Sollwerte zu der Masse m des Mischwassers und/oder der Masse m des Bindemittels und/oder der Masse m der Zuschlagstoffe und/oder der Masse m der Additive vorliegen, aufgrund derer die Dosiereinrichtungen 158, 160, 162, 164 angesteuert werden können, um erfasste Ist-Werte den hinterlegten Sollwerten anzugleichen.The mix water, binder, aggregate and additives then enter a slurry mixer 166 which is adapted to mix the mix water, binder, aggregate and additives Additives to produce a suspension. The device or suspension mixer 166 can include at least one weighing device 168, which is set up to add a mass m of the mixed water and/or a mass m of the binder and/or a mass m of the aggregates and/or a mass m of the additives capture. Weighing device 168 can forward the recorded values to a control and/or regulation unit 170 of suspension mixer 166, which, for example, calculates target values for the mass m of the mixed water and/or the mass m of the binder and/or the mass m of the aggregates and/or the Mass m of the additives are present, on the basis of which the metering devices 158, 160, 162, 164 can be controlled in order to adjust the recorded actual values to the stored target values.

Die in dem Suspensionsmischer 166 erzeugte Suspension tritt in einen Pufferbehälter 172 ein, in welchem die erzeugte Suspension zwischengespeichert werden kann.The suspension produced in the suspension mixer 166 enters a buffer container 172 in which the suspension produced can be temporarily stored.

Über eine wie aus der Vorrichtung 10 bekannte Dosierpumpe 122 wird die Suspension dann über eine, ebenfalls aus der Vorrichtung 10 bekannte, Messeinrichtung 124 in die Mischkammer 118 gefördert. In der Mischkammer 118 wird der Schaum mit der Suspension analog zu der Beschreibung mit Bezug auf Figur 1 zu einer Dispersion vermischt, deren Temperatur T in einer Temperaturmesseinrichtung 134 erfasst wird.The suspension is then conveyed into the mixing chamber 118 via a metering pump 122 known from the device 10 via a measuring device 124 also known from the device 10 . In the mixing chamber 118 the foam is mixed with the suspension analogously to the description with reference to FIG figure 1 mixed to form a dispersion, the temperature T of which is recorded in a temperature measuring device 134 .

Im Gegensatz zu der Steuerungs- und/oder Regelungseinheit 36 der Vorrichtung 10 weist eine Steuerungs- und/oder Regelungseinheit 136 der Vorrichtung 110 zusätzlich einen Volumenstrom Q des über den Wassereingang 142 in die Vorrichtung 110 eingespeisten Wassers als Eingangsgröße auf. Entsprechend ist die Steuerungs- und/oder Regelungseinheit 136 auch dazu eingerichtet, die Dosiereinrichtung 144 für das in die Vorrichtung 110 einzuspeisende Wasser und damit die Menge des in die Vorrichtung 110 eingespeisten Wassers zu regeln.In contrast to the control and/or regulation unit 36 of the device 10, a control and/or regulation unit 136 of the device 110 also has a volume flow Q of the water fed into the device 110 via the water inlet 142 as an input variable. Accordingly, the control and/or regulation unit 136 is also set up to regulate the dosing device 144 for the water to be fed into the device 110 and thus the quantity of water fed into the device 110 .

Claims (15)

1. Apparatus (10, 110) for the production of foamed building materials, comprising
• a gas supply unit (12, 112) which is configured to supply gas to the apparatus (10, 110),
• a suspension supply unit (20, 150 - 156) which is configured to supply suspension to the apparatus (10, 110), and
• a mixing chamber (18, 118) which is configured to mix the gas supplied by the gas supply unit (12, 112) and the suspension supplied by the suspension supply unit (20, 150 - 156) to form a dispersion,
characterized in that the apparatus (10, 110) further comprises a control and/or regulating unit (36, 136) which has means (16, 24, 30, 34, 116, 124, 130, 134, 146) for supplying values of a plurality of input parameters, based on which at least a temperature (T) of the dispersion and an air pressure (P) in an environment of the apparatus (10, 110) is inferable, wherein the control and/or regulating unit (36, 136) is further configured, based on the values of the input parameters supplied to it, to influence at least one output parameter (Q, m), by means of which the ratio of the volumes and/or masses and/or densities of gas and suspension supplied per unit of time is adjustable.
Apparatus (10, 110) according to claim 1,
characterized in that the means (16, 24, 30, 34, 116, 124, 130, 134, 146) are configured to detect a temperature (T) of the dispersion in a region (32) in which the dispersion leaves the mixing chamber (18, 118) or/and in which the dispersion leaves a conveying unit associated with the mixing chamber (18, 118).
Apparatus (110) according to claim 1 or 2,
characterized in that the apparatus (110) further comprises a foam generating unit (148) which is upstream of the mixing chamber (118) and which is configured to mix the gas supplied by the gas supply unit (112) with a liquid, whereby a foam is formed.
Apparatus (10, 110) according to any of claims 1 to 3,
characterized in that the mixing chamber (18, 118) is sealed with respect to an external environment of the mixing chamber (18, 118).
Apparatus (10, 110) according to any of claims 1 to 4,
characterized in that the means (16, 24, 30, 34, 116, 124, 130, 134, 146) for supplying values of a plurality of parameters comprise at least one temperature sensor (34, 134) and/or one air pressure sensor (38, 138).
Apparatus (10, 110) according to any of claims 1 to 5, if necessary according to claim 3,
characterized in that the apparatus (10, 110) further comprises at least one further temperature sensor which is configured to detect a temperature (T) of the suspension supplied by the suspension supply unit (20, 150 - 156) and/or of the gas supplied by the gas supply unit (12, 112) and/or of the foam introduced into the mixing chamber (18, 118) by the foam generating unit (148).
Apparatus (10, 110) according to any of claims 1 to 6,
characterized in that the apparatus (10, 110) further comprises a memory unit (40, 140) which is operatively coupled to the control and/or regulating unit (36, 136) and which is configured to output at least one value from a predetermined dispersion temperature (T) and/or a predetermined gas temperature and/or a predetermined suspension temperature and/or a predetermined air pressure (P) to the control and/or regulating unit (36, 136).
Apparatus (10, 110) according to any of claims 1 to 7,
characterized in that the apparatus (10, 110) further comprises at least one further pressure sensor which is configured to detect a system pressure during a gas input and/or a pressure in a discharge space of the foamed dispersion.
Apparatus (10, 110) according to any of claims 1 to 8,
characterized in that the apparatus (10, 110) further comprises at least one mass flow sensor, in particular a calorimetric flow measuring device which is configured to detect a mass flow of the gas supplied and/or a mass flow of the dispersion and/or a mass flow of the suspension and/or a mass flow of the liquid supplied and/or a mass flow of the foam supplied.
Apparatus (10, 110) according to any of claims 1 to 9,
characterized in that the apparatus (10, 110) further comprises at least one volume flow sensor (16, 24, 30, 116, 124, 130, 146) which is configured to detect a volume flow (Q) of the gas supplied and/or a volume flow (Q) of the dispersion and/or a volume flow (Q) of the suspension and/or a volume flow (Q) of the liquid supplied and/or a volume flow (Q) of the foam supplied.
Apparatus (10, 110) according to claim 10,
characterized in that the volume flow sensor (16, 24, 30, 116, 124, 130, 146) comprises one of an impeller sensor, a vortex flow measuring device, a float-type flow measuring device and a calorimetric flow measuring device.
Method for producing foamed building materials, comprising the steps:
• Providing a suspension using a suspension supply unit (20, 150 - 156),
• Providing a gas using a gas supply unit (12, 112), and
• Mixing the suspension and the gas to a dispersion in a mixing chamber (18, 118),
characterized in that the method further comprises the steps:
• Detecting a temperature (T) of the dispersion
• Detecting an ambient air pressure (P),
• Transmitting the detected temperature (T) of the dispersion and of the detected ambient air pressure (P) to a control and/or regulating unit (36, 136),
• Adjusting at least one of a volume flow (Q) of the gas, a mass (m) of the gas, a temperature (T) of the gas, a pressure (p) of the gas, a volume flow (Q) of the suspension, a mass (m) of the suspension and a density of the suspension by the control and/or regulating unit (36, 136), based on the detected temperature (T) of the dispersion and the detected ambient air pressure (P).
Method according to claim 12,
characterized in that the method further comprises the steps:
• Providing at least one reference value from a memory unit (40, 140) to the control and/or regulating unit (36, 136),
wherein the reference value indicates at least one of a temperature (T) and/or a pressure and/or a volume flow (Q) of the dispersion and/or a temperature and/or a pressure and/or a volume flow (Q) of the gas and/or a temperature and/or a pressure and/or a volume flow (Q) of the suspension
• Comparing a currently detected value with an associated reference value, and
• Adjusting a device and/or unit and/or apparatus (14, 22, 28, 114, 122, 128, 144) associated with a particular value in such a manner that a current value approximates to the associated reference value.
Method according to claim 12 or 13,
characterized in that a particular reference value and/or a particular current value are standardized to predefined standard conditions before the step of comparing.
Method according to claim 14,
characterized in that a volume information of the standard conditions is given in standard liters NL at 0°C and an absolute air pressure of 1013.25 mbar.
EP19758705.8A 2018-08-23 2019-08-22 Device for producing foamed construction materials Active EP3840923B1 (en)

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