EP0453745B1 - Method and device for inside cleaning of a powder conveying pipeline, in particular a hose of an electrostatic powder coating device - Google Patents
Method and device for inside cleaning of a powder conveying pipeline, in particular a hose of an electrostatic powder coating device Download PDFInfo
- Publication number
- EP0453745B1 EP0453745B1 EP91103603A EP91103603A EP0453745B1 EP 0453745 B1 EP0453745 B1 EP 0453745B1 EP 91103603 A EP91103603 A EP 91103603A EP 91103603 A EP91103603 A EP 91103603A EP 0453745 B1 EP0453745 B1 EP 0453745B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- powder
- granules
- granule
- container
- air current
- 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.)
- Expired - Lifetime
Links
- 239000000843 powder Substances 0.000 title claims description 33
- 238000004140 cleaning Methods 0.000 title claims description 15
- 238000000034 method Methods 0.000 title claims description 13
- 238000000576 coating method Methods 0.000 title claims description 12
- 239000011248 coating agent Substances 0.000 title claims description 11
- 239000008187 granular material Substances 0.000 claims description 34
- 239000007921 spray Substances 0.000 claims description 12
- 239000004952 Polyamide Substances 0.000 claims description 2
- 239000004033 plastic Substances 0.000 claims description 2
- 229920003023 plastic Polymers 0.000 claims description 2
- 229920002647 polyamide Polymers 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 238000009434 installation Methods 0.000 claims 1
- 239000002245 particle Substances 0.000 claims 1
- 239000000203 mixture Substances 0.000 description 3
- 229920000426 Microplastic Polymers 0.000 description 1
- 244000007853 Sarothamnus scoparius Species 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229940098458 powder spray Drugs 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/04—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes
- B08B9/053—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved along the pipes by a fluid, e.g. by fluid pressure or by suction
- B08B9/057—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved along the pipes by a fluid, e.g. by fluid pressure or by suction the cleaning devices being entrained discrete elements, e.g. balls, grinding elements, brushes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
- B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
- B05B15/55—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter using cleaning fluids
Definitions
- the invention relates to a method and a device for cleaning the inside of a powder-carrying line, in particular a hose line, of an electrostatic powder coating system, in particular in the event of a color change.
- the powder-carrying connecting lines in particular powder hoses
- the powder hoses have so far only been cleaned to a greater or lesser extent by blowing compressed air through them.
- the powder of the new color must then first be sprayed "into the void", but this also offers no security and is understandably uneconomical. In practice, therefore, the procedure is usually that the powder hoses are changed when the color changes such that there is a separate hose for each color type.
- the object of the present invention is therefore to provide a simple, quick to carry out and nevertheless very effective method for cleaning the inside of powder-carrying lines without having to dismantle the lines on the spray guns or on the automatic movement machines carrying the spray guns. This object is achieved from the features of claims 1 and 5.
- the internal cleaning of the powder-carrying lines takes place in that granules are passed through the line to be cleaned at a comparatively high speed. It is then only necessary to dismantle the line from the powder supply container and connect it to a granule supply, whereas dismantling the line on the spray gun or on the automatic machine is superfluous because the granules are discharged by the spray gun, the powder-carrying lines of which are also cleaned.
- the lines containing powder residues are remarkably effectively cleaned by the granules which are passed through, the powder carried by the granules during this cleaning being able to be separated off in a simple manner and can be reused.
- 10 denotes a storage container for the granules used for cleaning.
- an inclined sieve 11 which, on the one hand, serves to feed the granules to an injector 12 attached to the container outlet and, on the other hand, to separate out granules of small grain size.
- the injector 12 is connected on the one hand to a compressed air supply 13, while its outlet, for example by means of a quick coupling, can be connected to the powder supply hose 15 of a powder spray gun 16 to be cleaned.
- the gun 16 its powder feed hose 15 is connected to a powder feed (not shown), for example the injector of a powder supply and processing container. If the hose 15 is now to be cleaned for a color change, the hose 15 is removed from the injector of the powder container and mounted at the outlet of the injector 12. If compressed air is now supplied to the injector 12 through the line 13, the injector 12 removes 10 granules from the granule container and passes a granule-air mixture through the hose line 15 into the spray gun 16, which delivers the granule-air mixture in the spraying direction.
- the nozzle part of the spray gun 16 is preferably removed for this cleaning phase, especially if it is a nozzle part with a baffle.
- a simple return hose 17 is attached to the front part of the gun, with a cyclone-like strainer basket in the form of a wire basket 18 arranged at its free end to which a separation air nozzle 20 connected to a compressed air supply 19 and a granulate collecting container 21 are assigned.
- the granulate-powder-air mixture emerging from the return hose 17 passes into the wire basket 18 and is separated there by the separating air emerging from the nozzle 20, such that the granulate falls down into the collecting container 21, whereas the compressed air and the the powder they carry to a powder filter (not shown) or to the usual cabin cleaning filter, where the powder is separated from the air and recycled.
- the compressed air supply lines 13 and 19 are switched off and the powder hose 15 is removed from the injector 12 and connected to the supply line for the new powder of the next coating process.
- the granules are preferably plastic granules that generate as little friction as possible, for example from polyamide granules.
- the grain size of the granules should be between 1 and 3 mm, preferably 1.5 mm.
- the amount of air used to transport the granules is preferably about a power of ten above that usually used for powder coating. In practice, this is achieved in a simple manner in that the injector 12 is fed directly from the compressed air network, which usually has a pressure of 7 bar, that is to say without the interposition of a pressure reducer, and by using an injector nozzle which is larger in comparison to powder coating; for powder coating, as is known, the network pressure mentioned for feeding the powder injector is considerably reduced.
- the granule density in the granule-air stream passing through the hose to be cleaned can be chosen such that there are distances between the individual granules; the granules do not move "laminar” within the tube, but rather carry out irregular ("prancing and helical") forward movements so that they are thrown on their way from one side of the hose wall to another side of the hose wall and thereby remove powder residues from the inner wall of the hose.
- the injector 12 attached to the container 10 for the granulate, as well as the wire basket 18 for the return of the granulate, can be designed so that several hoses can be connected to it at the same time, so that several systems can be cleaned at the same time.
- the sieve basket 18 can also have a different shape and form for separating the granules and recycling them.
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electrostatic Spraying Apparatus (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Coating Apparatus (AREA)
- Spray Control Apparatus (AREA)
Description
Die Erfindung betrifft ein Verfahren und eine Einrichtung zum Innenreinigen einer pulverführenden Leitung, insbesondere Schlauchleitung, einer elektrostatischen Pulverbeschichtungsanlage, insbesondere bei einem Farbwechsel.The invention relates to a method and a device for cleaning the inside of a powder-carrying line, in particular a hose line, of an electrostatic powder coating system, in particular in the event of a color change.
Bei einem Farbwechsel müssen neben der Kabine, den Pulverbehältern und den Sprühpistolen auch die pulverführenden Verbindungsleitungen, insbesondere handelt es sich dabei um Pulverschläuche, gereinigt werden. Im Gegensatz zur Kabinen- und Behälterreinigung, wo man beispielsweise manuell mit Besen oder mit automatisch bewegten Bürsten- und Blassystemen abreinigt, können Pulverschläuche bisher lediglich mittels Hindurchblasen von Druckluft mehr oder weniger unzulänglich gereinigt werden. Ein derartiges Verfahren wird in der US-A-4248379 beschrieben. Das Pulver der neuen Farbe muß dann zunächst "ins Leere" versprüht werden, was aber auch keine Sicherheit bietet und verständlicherweise unwirtschaftlich ist. Man geht deshalb in der Praxis meist so vor, daß bei einem Farbwechsel die Pulverschläuche gewechselt werden derart, daß für jede Farbart ein eigener Schlauch vorhanden ist. Besonders bei häufigem Farbwechsel und bei Bewegungseinrichtungen und Robotern für die Sprühpistolen ist verständlicherweise ein derartiger Schlauchwechsel umständlich und zeitaufwendig, weil dort die Schläuche auch noch in den Gelenkpunkten der Bewegungsautomaten befestigt sind. Aufgabe der vorliegenden Erfindung ist deshalb ein einfaches, schnell durchzuführendes und trotzdem sehr wirkungsvolles Verfahren zum Innenreinigen pulverführender Leitungen, ohne die Leitungen an den Sprühpistolen bzw. den die Sprühpistolen tragenden Bewegungsautomaten abmontieren zu müssen, zu schaffen. Die Lösung dieser Aufgabe ergibt sich aus den Merkmalen der Patentansprüche 1 und 5.When changing colors, in addition to the booth, the powder containers and the spray guns, the powder-carrying connecting lines, in particular powder hoses, must also be cleaned. In contrast to the cleaning of cabins and containers, where cleaning is done manually, for example, with a broom or with automatically moving brush and blow systems, powder hoses have so far only been cleaned to a greater or lesser extent by blowing compressed air through them. Such a method is described in US-A-4248379. The powder of the new color must then first be sprayed "into the void", but this also offers no security and is understandably uneconomical. In practice, therefore, the procedure is usually that the powder hoses are changed when the color changes such that there is a separate hose for each color type. Particularly with frequent color changes and with movement devices and robots for the spray guns, such a hose change is understandably cumbersome and time-consuming because the hoses are also attached to the articulation points of the automatic machines. The object of the present invention is therefore to provide a simple, quick to carry out and nevertheless very effective method for cleaning the inside of powder-carrying lines without having to dismantle the lines on the spray guns or on the automatic movement machines carrying the spray guns. This object is achieved from the features of claims 1 and 5.
Bei der Erfindung erfolgt also die Innenreinigung der pulverführenden Leitungen dadurch, daß Granulen mit vergleichsweise hoher Geschwindigkeit durch die zu reinigende Leitung hindurchgeführt werden. Dabei ist es dann lediglich erforderlich, die Leitung vom Pulverzuführungsbehälter abzumontieren und an einer Granulenzuführung anzuschließen, wohingegen ein Abmontieren der Leitung an der Sprühpistole bzw. am Bewegungsautomaten überflüssig ist, weil die Granulen durch die Sprühpistole ausgetragen werden, deren pulverführende Leitungen dabei mitgereinigt werden. Versuche haben gezeigt, daß die Pulverreste enthaltenden Leitungen durch die hindurchgeschickten Granulen erstaunlich wirkungsvoll gereinigt werden, wobei das bei dieser Abreinigung von den Granulen mitgeführte Pulver auf einfache Weise abgeschieden und einer Wiederverwendung zugeführt werden kann.In the invention, therefore, the internal cleaning of the powder-carrying lines takes place in that granules are passed through the line to be cleaned at a comparatively high speed. It is then only necessary to dismantle the line from the powder supply container and connect it to a granule supply, whereas dismantling the line on the spray gun or on the automatic machine is superfluous because the granules are discharged by the spray gun, the powder-carrying lines of which are also cleaned. Experiments have shown that the lines containing powder residues are amazingly effectively cleaned by the granules which are passed through, the powder carried by the granules during this cleaning being able to be separated off in a simple manner and can be reused.
Zweckmäßige Ausgestaltungen des Erfindungsverfahrens sowie eine Einrichtung zur Durchführung des Verfahrens sind in den Unteransprüchen gekennzeichnet.Appropriate embodiments of the inventive method and a device for carrying out the method are characterized in the subclaims.
Die Erfindung wird nachfolgend anhand der Zeichnung beschrieben, wobei die einzige Figur eine Prinzipskizze darstellt.The invention is described below with reference to the drawing, the single figure representing a schematic diagram.
In der Zeichnung ist mit 10 ein Vorratsbehälter für die zum Reinigen dienenden Granulen bezeichnet. Im Behälter 10 befindet sich ein Schrägsieb 11, das zum einen dazu dient, die Granulen einem am Behälterausgang angebrachten Injektor 12 zuzuführen, zum anderen, Granulen zu geringer Korngröße auszuscheiden. Der Injektor 12 ist einerseits mit einer Druckluftzuführung 13 verbunden, während sein Auslaß, beispielsweise mittels einer Schnellkupplung, mit dem zu reinigenden Pulverzuführungsschlauch 15 einer Pulversprühpistole 16 verbindbar ist.In the drawing, 10 denotes a storage container for the granules used for cleaning. In the
Beim Beschichtungsbetrieb der Pistole 16 ist deren Pulverzuführschlauch 15 an eine nicht-gezeichnete Pulverzuführung angeschlossen, beispielsweise den Injektor eines Pulvervorrats-und Aufbereitungsbehälters. Soll nun der Schlauch 15 für einen Farbwechsel gereinigt werden, dann wird der Schlauch 15 vom Injektor des Pulverbehälters abmontiert und am Ausgang des Injektors 12 anmontiert. Wird jetzt durch die Leitung 13 dem Injektor 12 Druckluft zugeführt, dann entnimmt der Injektor 12 dem Granulenbehälter 10 Granulen und leitet ein Granulen-Luft-Gemisch durch die Schlauchleitung 15 in die Sprühpistole 16, die das Granulen-Luft-Gemisch in Sprührichtung abgibt. Der Düsenteil der Sprühpistole 16 wird vorzugsweise für diese Reinigungsphase abgenommen, insbesondere dann, wenn es sich um einen Düsenteil mit Prallkörper handelt.An das Pistolenvorderteil setzt man dafür einen einfachen Rückführungsschlauch 17 an, an dessem freien Ende ein zyklonartiger Siebkorb in Form eines Drahtkorbs 18 angeordnet ist, dem eine an eine Druckluftzuführung 19 angeschlossene Trennluft-Düse 20 und ein Granulat-Auffangbehälter 21 zugeordnet sind.During the coating operation of the
Das aus dem Rückführungsschlauch 17 austretende Granulat-Pulver-Luft-Gemisch gelangt in den Drahtkorb 18 und wird dort durch die aus der Düse 20 austretende Trennluft aufgetrennt, derart, daß das Granulat nach unten in den Auffangbehälter 21 fällt, wohingegen die Druckluft und das von ihr mitgeführte Pulver zu einem - nicht-gezeichneten - Pulverfilter oder zu dem üblichen Kabinenreinigungsfilter gelangen, wo das Pulver aus der Luft abgeschieden und einer Wiederverwendung zugeführt wird.The granulate-powder-air mixture emerging from the
Nach Beendigung der Reinigungsphase werden die Druckluftzuführungen 13 und 19 abgeschaltet und der Pulverschlauch 15 wird vom Injektor 12 abgenommen und an der Zuführung für das neue Pulver des nächsten Beschichtungsvorgangs angeschlossen.After the cleaning phase has ended, the compressed
Bei den Granulen handelt es sich vorzugsweise um ein Kunststoffgranulat, das möglichst wenig Reibungsaufladung erzeugt, beispielsweise aus Polyamidgranulat. Die Korngröße der Granulen soll zwischen 1 und 3 mm liegen, vorzugsweise bei 1,5 mm. Die Luftmenge, die für den Transport der Granulen verwendet wird, liegt vorzugsweise etwa eine Zehnerpotenz über derjenigen, die üblicherweise für die Pulverbeschichtung verwendet wird. In der Praxis wird dies auf einfache Weise dadurch erreicht, daß der Injektor 12 aus dem Druckluftnetz, das üblicherweise einen Druck von 7 bar aufweist, unmittelbar gespeist wird, also ohne Zwischenschalten eines Druckreduzierers, und daß eine im Vergleich zum Pulverbeschichten grössere Injektordüse verwendet wird; für das Pulverbeschichten wird ja bekanntlich der erwähnte Netzdruck zum Speisen des Pulverinjektors beträchtlich reduziert. Die Granulendichte in dem den zu reinigenden Schlauch durchsetzenden Granulen-Luft-Strom kann durchaus so gewählt werden, daß zwischen den einzelnen Granulen Abstände bestehen; die Granulen bewegen sich nämlich innerhalb des Schlauchs nicht "laminar", sondern führen unregelmäßige ("tänzelnde und schraubenförmige") Vorwärtsbewegungen aus, so daß sie auf ihrem Weg von einer Seite der Schlauchwandung auf eine andere Seite der Schlauchwandung geschleudert werden und dabei Pulverreste von der Schlauchinnenwand abtragen.The granules are preferably plastic granules that generate as little friction as possible, for example from polyamide granules. The grain size of the granules should be between 1 and 3 mm, preferably 1.5 mm. The amount of air used to transport the granules is preferably about a power of ten above that usually used for powder coating. In practice, this is achieved in a simple manner in that the
Erprobungen haben gezeigt, daß der Granulen-Reinigungsvorgang in etwa drei Minuten abgeschlossen ist, wobei der Schlauch dann einen sehr hohen Grad an Freiheit von Restpulver aufweist.Tests have shown that the granule cleaning process is completed in about three minutes, the tube then having a very high degree of freedom from residual powder.
Der am Behälter 10 für das Granulat angebrachte Injektor 12, wie auch der Drahtkorb 18 für die Rückführung des Granulats, können so ausgebildet sein, daß an sie mehrere Schläuche gleichzeitig anschließbar sind, so daß mehrere Systeme gleichzeitig reinigbar sind.The
Selbstverständlich sind zahlreiche Abwandlungen möglich. So kann beispielsweise anstelle des erwähnten elektrostatisch neutralen Kunststoffgranulats auch ein solches gewählt werden, das bei Reinigungsaufladung die zum Pulver entgegengesetzte Ladung aufnimmt, so daß sich dann die beiden Ladungen nahezu ausgleichen. Auch kann der Siebkorb 18 zur Abtrennung des Granulats und Rückführung desselben eine andere Gestalt und Form aufweisen.Of course, numerous modifications are possible. For example, instead of the electrostatically neutral plastic granulate mentioned, one can also be chosen which, when cleaning, charges the opposite charge to the powder, so that the two charges then almost equalize. The
Claims (7)
- Process for cleaning the inside of a powder-conveying line, in particular a hose line of an electrostatic powder coating installation, in particular during an ink change, characterised in that a compressed air current charged with granules is conveyed through the hose line after the coating phase, wherein the speed of the granule-air current considerably exceeds that of the powder-air current of the coating phase and the size of the granules considerably exceeds that of the powder particles of the coating phase, and in that the granules are separated from the compressed air current after leaving the hose line, and are liberated from the entrained powder.
- Process according to claim 1, characterised in that the amount of air per unit of time of the granule-air current exceeds that of the powder-air current of the coating phase by approximately ten percent, and in that granules having a grain size between 1 and 3 mm, preferably 1.5 mm, are used.
- Process according to claim 1 or 2, characterised in that plastics granules, preferably polyamide granules, are used.
- Process according to one of claims 1 to 3, for cleaning the inside of a tube connecting a powder container to a spray gun, characterised in that the tube is removed from the powder container and connected to a granule supply line, and in that the spray nozzle of the spray gun is replaced by a return tube, the separation of the granules from the compressed air current being carried out after discharge from the return tube.
- Device for carrying out the process according to one of claims 1 to 4, the device having a granule container (10), at the outlet of which there is disposed a compressed-air-fed injector (12) with a tube connection at the injector outlet, and having a cyclone-type wire basket (18) with a compressed air supply nozzle (20) and a granule-catching container (21).
- Device according to claim 5, characterised in that a perforated base (11) is disposed in the granule container (10), inclined obliquely with respect to the container outlet.
- Device according to claim 5 or 6, characterised by a return tube (17) between the spray gun (16) and the wire basket (18).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4013060A DE4013060C1 (en) | 1990-04-24 | 1990-04-24 | Removing powder from spray gun tubing - by blowing down compressed air plus granules of larger particle size than powder and blowing at speed equal to air-powder draught |
| DE4013060 | 1990-04-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0453745A1 EP0453745A1 (en) | 1991-10-30 |
| EP0453745B1 true EP0453745B1 (en) | 1994-05-25 |
Family
ID=6404984
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP91103603A Expired - Lifetime EP0453745B1 (en) | 1990-04-24 | 1991-03-08 | Method and device for inside cleaning of a powder conveying pipeline, in particular a hose of an electrostatic powder coating device |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5170591A (en) |
| EP (1) | EP0453745B1 (en) |
| JP (1) | JPH0665388B2 (en) |
| DE (2) | DE4013060C1 (en) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4417727A1 (en) * | 1994-05-20 | 1995-11-23 | Gema Volstatic Ag | Hose brush for pipelines in powder spray-coating plants |
| JPH07313922A (en) * | 1994-05-24 | 1995-12-05 | I T M Kk | Gas transfer powder supply system for color change |
| DE4420579A1 (en) * | 1994-06-03 | 1995-12-07 | Meyer & John Gmbh & Co | Method for cleaning pipelines |
| US6223997B1 (en) | 1998-09-17 | 2001-05-01 | Nordson Corporation | Quick color change powder coating system |
| DE29819052U1 (en) * | 1998-10-26 | 2000-03-02 | J. Wagner Gmbh, 88048 Friedrichshafen | Conveyor |
| US6112999A (en) | 1998-11-13 | 2000-09-05 | Steelcase Development Inc. | Powder paint system and control thereof |
| US6705545B1 (en) | 1998-11-13 | 2004-03-16 | Steelcase Development Corporation | Quick color change powder paint system |
| US7325750B2 (en) * | 2000-10-05 | 2008-02-05 | Nordson Corporation | Powder coating system with improved overspray collection |
| US6695220B2 (en) | 2001-01-11 | 2004-02-24 | Herman Miller, Inc. | Powder spray coating system |
| US20050178851A1 (en) * | 2001-06-25 | 2005-08-18 | Nordson Corporation | Quick change powder coating spray system |
| JP5410720B2 (en) | 2008-09-25 | 2014-02-05 | 日立コンシューマエレクトロニクス株式会社 | Digital information signal transmitting / receiving apparatus and digital information signal transmitting / receiving method |
| CN102145340A (en) * | 2010-11-23 | 2011-08-10 | 瓮福（集团）有限责任公司 | Mechanical cleaning method of tube still heater |
| JP6265503B2 (en) * | 2015-05-25 | 2018-01-24 | 株式会社 サン・テクトロ | Prepreg manufacturing equipment |
| US11950677B2 (en) | 2019-02-28 | 2024-04-09 | L'oreal | Devices and methods for electrostatic application of cosmetics |
| CN113578567B (en) * | 2021-08-06 | 2022-08-23 | 宁波宇晓包装有限公司 | Production process of antibacterial, aging-resistant and high-strength spray gun |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US818776A (en) * | 1905-05-05 | 1906-04-24 | John D Murray | Sand-blast apparatus. |
| US3667675A (en) * | 1971-02-16 | 1972-06-06 | Graco Inc | Electrostatic powder coating apparatus |
| US4044507A (en) * | 1976-05-12 | 1977-08-30 | Silver Creek Minerals Corporation | Method and apparatus for stripping, cleaning and treating surfaces |
| US4412402A (en) * | 1978-07-28 | 1983-11-01 | Cavitron Inc. | Equipment and method for delivering an abrasive-laden gas stream |
| DE2849269C2 (en) * | 1978-11-14 | 1980-11-27 | Gema Ag, Apparatebau, St. Gallen (Schweiz) | Process for powder spraying and pneumatic powder spraying device |
| DE2930121C2 (en) * | 1979-07-25 | 1982-05-27 | Gema AG Apparatebau, 9015 St. Gallen | Method and device for spray-coating objects with powder |
| US4248379A (en) * | 1979-08-16 | 1981-02-03 | Nordson Corporation | Powder spray color change system |
| GB2073630B (en) * | 1980-04-12 | 1983-03-16 | Ogle & Sons Ltd G C | Sand-blasting equipment |
| DE3028588C2 (en) * | 1980-07-28 | 1982-05-27 | Gema AG Apparatebau, 9015 St. Gallen | Powder coating plant |
| US4452169A (en) * | 1982-09-24 | 1984-06-05 | Shinich Matsuda | Reviving apparatus for fluid passages |
| DE3408828A1 (en) * | 1984-03-10 | 1985-09-12 | Rudolf 4834 Harsewinkel Ristow | Method for cleaning surfaces, in particular inner surfaces of ventilation systems and system parts |
| US4773189A (en) * | 1985-11-01 | 1988-09-27 | Macmillan Gregory D | Separation system for polymeric blast media |
| GB8527244D0 (en) * | 1985-11-05 | 1985-12-11 | Roberts G S | Cleaning spray painting guns |
| DE8803364U1 (en) * | 1988-03-12 | 1988-05-05 | Bloch, Klaus, 5205 St Augustin | Blasting media made of thermoplastic material |
| US5011443A (en) * | 1990-01-02 | 1991-04-30 | Zenith Electronics Corporation | Cleaning of flat glass CRT faceplate with internal anti-glare surface |
-
1990
- 1990-04-24 DE DE4013060A patent/DE4013060C1/en not_active Expired - Fee Related
-
1991
- 1991-03-08 DE DE59101699T patent/DE59101699D1/en not_active Expired - Fee Related
- 1991-03-08 EP EP91103603A patent/EP0453745B1/en not_active Expired - Lifetime
- 1991-04-22 US US07/688,477 patent/US5170591A/en not_active Expired - Fee Related
- 1991-04-24 JP JP3122194A patent/JPH0665388B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE4013060C1 (en) | 1991-11-21 |
| JPH0584453A (en) | 1993-04-06 |
| EP0453745A1 (en) | 1991-10-30 |
| US5170591A (en) | 1992-12-15 |
| JPH0665388B2 (en) | 1994-08-24 |
| DE59101699D1 (en) | 1994-06-30 |
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