EP0661138A1 - Method for dry cleaning of facades - Google Patents

Method for dry cleaning of facades Download PDF

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Publication number
EP0661138A1
EP0661138A1 EP94116710A EP94116710A EP0661138A1 EP 0661138 A1 EP0661138 A1 EP 0661138A1 EP 94116710 A EP94116710 A EP 94116710A EP 94116710 A EP94116710 A EP 94116710A EP 0661138 A1 EP0661138 A1 EP 0661138A1
Authority
EP
European Patent Office
Prior art keywords
mixture
specific weight
abrasives
compressed air
weight
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP94116710A
Other languages
German (de)
French (fr)
Other versions
EP0661138B1 (en
Inventor
Günter Keuthe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bauunternehmung Bernhard Scholkemper & Co KG GmbH
Mineralienwerke Kuppenheim GmbH
Original Assignee
Bauunternehmung Bernhard Scholkemper & Co KG GmbH
Mineralienwerke Kuppenheim GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Bauunternehmung Bernhard Scholkemper & Co KG GmbH, Mineralienwerke Kuppenheim GmbH filed Critical Bauunternehmung Bernhard Scholkemper & Co KG GmbH
Publication of EP0661138A1 publication Critical patent/EP0661138A1/en
Application granted granted Critical
Publication of EP0661138B1 publication Critical patent/EP0661138B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C11/00—Selection of abrasive materials or additives for abrasive blasts

Definitions

  • a mixture of 70 to 90% by weight of glass granulate and 10 to 30% by weight of abrasives can be used. Only in the case of extreme soiling and hard stones such as granite can it be expedient to utilize the upper limit of the abrasive substances specified above, namely to use a mixture of up to 60% by weight of abrasive substances and the softer component.
  • silicon carbide with a specific weight of 3.2 g / cm3 and / or corundum with a specific weight of 3.9 to 4.0 g / cm3 and / or garnet or olivine with a specific weight of over 3, 5 g / cm3 can be used.
  • the facade surface to be treated is subjected to the blasting agent by moving the compressed air jet back and forth until the disruptive dirt is removed. This can easily be determined by observation.
  • the dust, dirt and the used abrasive are expediently suctioned off in order to avoid environmental pollution. Most of the dust and removed dirt particles can be separated by sieving or sifting in order to be able to reuse the abrasive. However, this can also be dispensed with if it cannot be ruled out that the dirt content, e.g. Paint residues in the recovered abrasive result in increased dust and pollutant emissions.

Abstract

In a method of dry-cleaning facades, a turbulent compressed air stream directs a mixture of granular softer particles and harder abrasive particles on the surface to be cleaned. Proportion of softer particles is 40-95 wt.% and particle hardness is 5.5-7 on Moh's scale, density is 2.0-2.8 g/cm3 and grain sizes are 40-200 mm. Harder particles are in a proportion of 5-60 wt.%, hardness is more than 7, density is more than 3.0g/cm3 and grain sizes are 30-180 mm.

Description

Die Erfindung betrifft ein Verfahren zur Trockenreinigung von Fassaden mit einem turbulenten Druckluftstrahl, der ein Gemisch aus körnigen Partikeln und Abrasivstoffen mitführt.The invention relates to a method for dry cleaning of facades with a turbulent compressed air jet, which carries a mixture of granular particles and abrasives.

Bei einem Verfahren, von dem die Erfindung ausgeht (DE 42 22 884, PatG § 3, 2) wird ein Gemisch aus 10 bis 50 Gew.-% Glasperlen und 50 bis 90 % Korunden verwendet. Da die Partikel des Gemisches einem turbulenten Druckluftstrahl aufgegeben werden, treffen sie nicht mehr senkrecht, sondern unter Winkeln auf die zu reinigende Fläche auf. Dabei tragen die Korundbestandteile aufgrund ihrer kristallinen Struktur Teile der Verschmutzung ab, so daß eine poröse Oberfläche entsteht, aus der vorstehende Spitzen oder Bereiche von den Glasperlen abgesprengt werden. Dabei wird der zu entfernende Schmutz von der Fassade schichtweise abgetragen. Der Druckluftstrahl kann einen Druck von 0,5 bis 6 bar aufweisen, wobei der Druck im Druckluftstrahl umso geringer sein soll, je empfindlicher das Material der Fassade ist. Das beschriebene Verfahren hat sich an sich bewährt. Als nachteilig wird jedoch der verhältnismäßig hohe Anteil an Abrasivstoffen im Gemisch angesehen.In a method from which the invention is based (DE 42 22 884, PatG § 3, 2), a mixture of 10 to 50 wt .-% glass beads and 50 to 90% corundum is used. As the particles of the mixture are applied to a turbulent jet of compressed air, they no longer hit the surface to be cleaned at an angle, but at angles. Due to their crystalline structure, the corundum components remove parts of the dirt, so that a porous surface is created, from which the protruding tips or areas are blasted off by the glass beads. The dirt to be removed is removed in layers from the facade. The compressed air jet can have a pressure of 0.5 to 6 bar, the pressure in the compressed air jet should be lower the more sensitive the material of the facade is. The method described has proven itself. However, the relatively high proportion of abrasive substances in the mixture is regarded as disadvantageous.

Aufgabe der Erfindung ist es, den Anteil der Abrasivstoffe im Gemisch zu reduzieren und gleichzeitig die Reinigungswirkung zu verbessern.The object of the invention is to reduce the proportion of abrasive substances in the mixture and at the same time to improve the cleaning effect.

Diese Aufgabe wird dadurch gelöst, daß ein Gemisch aus 40 bis 95 Gew.-% einer weicheren Komponente mit einer Härte nach Mohs von 5,5 bis 7, einem spezifischen Gewicht zwischen 2,0 und 2,8 g/cm³ und Korngrößen von 40 bis 200 µm sowie aus 5 bis 60 Gew.-% Abrasivstoffen mit einer Härte nach Mohs größer 7, einem spezifischen Gewicht über 3,0 g/cm³ und Korngrößen von 30 bis 180 µm verwendet wird. Vorzugsweise kann ein Gemisch aus 50 bis 90 Gew.-% Glasgranulat oder Schlackengranulat sowie aus 10 bis 50 Gew.-% körnigen Abrasivstoffen verwendet werden. Überraschenderweise hat sich gezeigt, daß trotz des vergleichsweise geringen Gehaltes körniger Abrasivstoffe im Gemisch die Reinigungswirkung gegenüber dem eingangs beschriebenen Verfahren nicht nur erhalten, sondern sogar verbessert wird. Das wird darauf zurückgeführt, daß die Partikel des Gemisches aufgrund ihres unterschiedlichen Gewichtes im turbulenten Druckluftstrahl unterschiedlich beschleunigt werden, und zwar sowohl in der Hauptrichtung des Druckluftstrahls als auch senkrecht dazu. Die härteren Abrasivstoffe lockern die Verschmutzungen auf, während die Partikel der weicheren und leichteren Komponente die Verschmutzungen abtragen, weil sie im turbulenten Druckluftstrahl stärker aus der Hauptrichtung abgelenkt werden. In Verbindung mit der Verwendung von Granulat anstelle von Glasperlen entsteht dabei eine bessere Reinigungswirkung, so daß im Ergebnis je nach Verschmutzungsgrad und Fassadenbeschaffenheit bis zu 300 m² Fassadenoberfläche pro Mann und Schicht gereinigt werden können.This object is achieved in that a mixture of 40 to 95 wt .-% of a softer component with a Mohs hardness of 5.5 to 7, a specific weight between 2.0 and 2.8 g / cm³ and grain sizes of 40 up to 200 µm and from 5 to 60% by weight of abrasive materials with a Mohs hardness greater than 7, a specific weight above 3.0 g / cm³ and grain sizes from 30 to 180 µm are used. Preferably a mixture of 50 to 90% by weight Glass granules or slag granules and from 10 to 50% by weight of granular abrasives can be used. Surprisingly, it has been shown that, despite the comparatively low content of granular abrasive substances in the mixture, the cleaning effect compared to the process described at the outset is not only maintained, but is even improved. This is attributed to the fact that the particles of the mixture are accelerated differently due to their different weight in the turbulent compressed air jet, both in the main direction of the compressed air jet and perpendicular to it. The harder abrasives loosen the dirt, while the particles of the softer and lighter components remove the dirt because they are deflected more from the main direction in the turbulent compressed air jet. In connection with the use of granules instead of glass beads, this results in a better cleaning effect, so that, depending on the degree of soiling and the nature of the facade, up to 300 m² of facade surface can be cleaned per man and shift.

In der Regel kann ein Gemisch aus 70 bis 90 Gew.-% Glasgranulat und 10 bis 30 Gew.-% Abrasivstoffe verwendet werden. Lediglich bei extremen Verschmutzungen und harten Steinen wie Granit kann es zweckmäßig sein, die oben angegebene obere Grenze der Abrasivstoffe auszunutzen, nämlich ein Gemisch aus bis zu 60 Gew.-% Abrasivstoffen und der weicheren Komponente zu verwenden.As a rule, a mixture of 70 to 90% by weight of glass granulate and 10 to 30% by weight of abrasives can be used. Only in the case of extreme soiling and hard stones such as granite can it be expedient to utilize the upper limit of the abrasive substances specified above, namely to use a mixture of up to 60% by weight of abrasive substances and the softer component.

Als körnige Abrasivstoffe können Siliziumcarbid mit einem spezifischen Gewicht von 3,2 g/cm³ und/oder Korunde mit einem spezifischen Gewicht von 3,9 bis 4,0 g/cm³ und/oder Granat bzw. Olivin mit einem spezifischen Gewicht von über 3,5 g/cm³ verwendet werden.As granular abrasives, silicon carbide with a specific weight of 3.2 g / cm³ and / or corundum with a specific weight of 3.9 to 4.0 g / cm³ and / or garnet or olivine with a specific weight of over 3, 5 g / cm³ can be used.

Im allgemeinen genügt es, das Gemisch einem Druckluftstrahl aufzugeben. Die erforderlichen Turbulenzen im Druckluftstrahl entstehen dann durch das unterschiedliche Verhalten der einzelnen Partikel, vorzugsweise werden las Glasgranulat und die körnigen Abrasivstoffe dem turbulenten Druckluftstrahl aufgegeben. Dadurch verstärkt sich die Turbulenz im Druckluftstrahl.It is generally sufficient to apply the mixture to a jet of compressed air. The required turbulence in the compressed air jet then results from the different behavior of the individual particles, preferably glass granulate and the granular abrasives are given to the turbulent compressed air jet. This increases the turbulence in the compressed air jet.

Die zu behandelnde Fassadenoberfläche wird durch Hin- und Herbewegen des Druckluftstrahls solange mit dem Strahlmittel beaufschlagt, bis der störende Schmutz entfernt ist. Das läßt sich unschwer durch Beobachtung feststellen. Der anfallende Staub, Schmutz und das verbrauchte Strahlmittel werden zweckmäßigerweise abgesaugt, um Umweltbelastungen zu vermeiden. Der Staub und abgetragene Schmutzpartikel können größtenteils durch Sieben oder Sichten abgetrennt werden, um das Strahlmittel wieder verwenden zu können. Darauf kann aber auch verzichtet werden, wenn nicht ausgeschlossen werden kann, daß die Schmutzanteile wie z.B. Lackreste im zurückgewonnenen Strahlmittel erhöhte Staub - und Schadstoffemissionen auftreten.The facade surface to be treated is subjected to the blasting agent by moving the compressed air jet back and forth until the disruptive dirt is removed. This can easily be determined by observation. The dust, dirt and the used abrasive are expediently suctioned off in order to avoid environmental pollution. Most of the dust and removed dirt particles can be separated by sieving or sifting in order to be able to reuse the abrasive. However, this can also be dispensed with if it cannot be ruled out that the dirt content, e.g. Paint residues in the recovered abrasive result in increased dust and pollutant emissions.

Claims (5)

Verfahren zur Trockenreinigung von Fassaden mit einem turbulenten Druckluftstrahl, der ein Gemisch aus körnigen Partikeln und Abrasivstoffen mitführt, dadurch gekennzeichnet, daß ein Gemisch aus 40 bis 95 Gew.-% einer weicheren Komponente mit einer Härte nach Mohs von 5,5 bis 7, einem spezifischen Gewicht zwischen 2,0 und 2,8 g/cm³ und Korngrößen von 40 bis 200 µm sowie aus 5 bis 60 Gew.-% Abrasivstoffen mit einer Härte nach Mohs größer 7, einem spezifischen Gewicht über 3,0 g/cm³ und Korngrößen von 30 bis 180 µm verwendet wird.Process for dry cleaning of facades with a turbulent compressed air jet which carries a mixture of granular particles and abrasives, characterized in that a mixture of 40 to 95% by weight of a softer component with a Mohs hardness of 5.5 to 7, one specific weight between 2.0 and 2.8 g / cm³ and grain sizes from 40 to 200 µm as well as from 5 to 60% by weight of abrasives with a Mohs hardness greater than 7, a specific weight over 3.0 g / cm³ and grain sizes from 30 to 180 µm is used. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, daß ein Gemisch aus 50 bis 90 Gew.-% Glasgranulat mit einem spezifischen Gewicht von 2,3 g/cm³ sowie aus 10 bis 50 Gew.-% körnigen Abrasivstoffen mit einem spezifischen Gewicht von 3,5 bis 4,4 g/cm³ verwendet wird.A method according to claim 1, characterized in that a mixture of 50 to 90 wt .-% glass granules with a specific weight of 2.3 g / cm³ and from 10 to 50 wt .-% granular abrasives with a specific weight of 3.5 up to 4.4 g / cm³ is used. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß ein Gemisch aus 70 bis 90 Gew.-% Glasgranulat und 10 bis 30 Gew.-% körniger Abrasivstoffe verwendet wird.A method according to claim 1 or 2, characterized in that a mixture of 70 to 90 wt .-% glass granules and 10 to 30 wt .-% granular abrasives is used. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß körnige Abrasivstoffe aus Siliziumcarbid mit einem spezifischen Gewicht von 3,2 g/cm³ und/oder Korunde mit einem spezifischen Gewicht von 3,9 bis 4,0 g/cm³ und/oder Granat bzw. Olivin mit einem spezifischen Gewicht von über 3,5 g/cm³ verwendet werden.Method according to one of claims 1 to 3, characterized in that granular abrasives made of silicon carbide with a specific weight of 3.2 g / cm³ and / or corundum with a specific weight of 3.9 to 4.0 g / cm³ and / or Garnet or olivine with a specific weight of over 3.5 g / cm³ can be used. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das Gemisch aus Glasgranulat und körnigen Abrasivstoffen dem turbulenten Druckluftstrahl aufgegeben wird.Method according to one of claims 1 to 4, characterized in that the mixture of glass granules and granular abrasives is applied to the turbulent compressed air jet.
EP94116710A 1993-12-18 1994-10-22 Method for dry cleaning of facades Expired - Lifetime EP0661138B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4343371A DE4343371C1 (en) 1993-12-18 1993-12-18 Process for dry cleaning of façades
DE4343371 1993-12-18

Publications (2)

Publication Number Publication Date
EP0661138A1 true EP0661138A1 (en) 1995-07-05
EP0661138B1 EP0661138B1 (en) 1999-03-31

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EP94116710A Expired - Lifetime EP0661138B1 (en) 1993-12-18 1994-10-22 Method for dry cleaning of facades

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EP (1) EP0661138B1 (en)
AT (1) ATE178251T1 (en)
DE (1) DE4343371C1 (en)
DK (1) DK0661138T3 (en)
ES (1) ES2132303T3 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202007018670U1 (en) * 2007-07-24 2009-03-19 Schulte, Christian facade treatment

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1140120B (en) * 1958-09-11 1962-11-22 Von Roll Ag Refractory slag blasting abrasives and process for their manufacture
US4035962A (en) * 1973-11-08 1977-07-19 Ayers Joseph W Zircon sand impacting material
US4044507A (en) * 1976-05-12 1977-08-30 Silver Creek Minerals Corporation Method and apparatus for stripping, cleaning and treating surfaces
GB2106430A (en) * 1981-08-28 1983-04-13 British Steel Corp Stainless steel sheet or strip
EP0116272A2 (en) * 1983-01-15 1984-08-22 Krupp-Steag Strahlmittel Gesellschaft mit beschränkter Haftung Manufacturing process of silicon and iron free blast material for surface treatment
US4519811A (en) * 1984-05-24 1985-05-28 Societe Nationale De L'amiante Calcined serpentine useful as sandblasting agent
DE4222884A1 (en) * 1992-07-11 1994-01-13 Guenter Keuthe Building facade dry cleaning by pressurised air jet - uses turbulent air jet and blasting mixt. of glass pearls, normal and mixed corundum

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1140120B (en) * 1958-09-11 1962-11-22 Von Roll Ag Refractory slag blasting abrasives and process for their manufacture
US4035962A (en) * 1973-11-08 1977-07-19 Ayers Joseph W Zircon sand impacting material
US4044507A (en) * 1976-05-12 1977-08-30 Silver Creek Minerals Corporation Method and apparatus for stripping, cleaning and treating surfaces
GB2106430A (en) * 1981-08-28 1983-04-13 British Steel Corp Stainless steel sheet or strip
EP0116272A2 (en) * 1983-01-15 1984-08-22 Krupp-Steag Strahlmittel Gesellschaft mit beschränkter Haftung Manufacturing process of silicon and iron free blast material for surface treatment
US4519811A (en) * 1984-05-24 1985-05-28 Societe Nationale De L'amiante Calcined serpentine useful as sandblasting agent
DE4222884A1 (en) * 1992-07-11 1994-01-13 Guenter Keuthe Building facade dry cleaning by pressurised air jet - uses turbulent air jet and blasting mixt. of glass pearls, normal and mixed corundum

Also Published As

Publication number Publication date
DK0661138T3 (en) 1999-10-18
EP0661138B1 (en) 1999-03-31
ATE178251T1 (en) 1999-04-15
ES2132303T3 (en) 1999-08-16
DE4343371C1 (en) 1994-09-29

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