DE1296113B - Means and device for cooling wire rod coiled into rings - Google Patents

Means and device for cooling wire rod coiled into rings

Info

Publication number
DE1296113B
DE1296113B DER41199A DER0041199A DE1296113B DE 1296113 B DE1296113 B DE 1296113B DE R41199 A DER41199 A DE R41199A DE R0041199 A DER0041199 A DE R0041199A DE 1296113 B DE1296113 B DE 1296113B
Authority
DE
Germany
Prior art keywords
nozzles
cooling
patent application
wire
ring
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.)
Withdrawn
Application number
DER41199A
Other languages
German (de)
Inventor
Dr Hans Eberhard
Moebius
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.)
ROECHLING SCHE EISEN
STAHLWERKE GmbH
Original Assignee
ROECHLING SCHE EISEN
STAHLWERKE 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.)
Filing date
Publication date
Priority to DER39509A priority Critical patent/DE1279605B/en
Application filed by ROECHLING SCHE EISEN, STAHLWERKE GmbH filed Critical ROECHLING SCHE EISEN
Priority to DER41199A priority patent/DE1296113B/en
Priority to DE1965R0042212 priority patent/DE1296112B/en
Priority to FR42982A priority patent/FR1464966A/en
Priority to SE16435/65A priority patent/SE319145B/xx
Priority to NL6516653A priority patent/NL6516653A/xx
Priority to GB54103/65A priority patent/GB1112160A/en
Priority to US515329A priority patent/US3339373A/en
Publication of DE1296113B publication Critical patent/DE1296113B/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
    • B21C47/26—Special arrangements with regard to simultaneous or subsequent treatment of the material
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • C21D1/667—Quenching devices for spray quenching
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/84—Controlled slow cooling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/573—Continuous furnaces for strip or wire with cooling
    • C21D9/5732—Continuous furnaces for strip or wire with cooling of wires; of rods
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0224—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for wire, rods, rounds, bars

Description

Gegenstand der Hauptpatentanmeldung sind ein Mittel und eine Vorrichtung zum Kühlen von zu Ringen gehaspeltem Walzdraht. Das Mittel zum Kühlen nach der Hauptpatentanmeldung ist Nebel, d. h. ein Wasser-Luft-Gemisch, bei dem die Wassertropfen eine Größe unter 50 μηι haben.The main patent application relates to a means and a device for cooling to Coiled wire rod rings. The means of cooling according to the main patent application is mist, i. H. a water-air mixture in which the water droplets have a size below 50 μm.

Weitere praktische Versuche haben ergeben, daß es für die Kühlwirkung nicht gleichgültig ist, welche Tropfengröße bei einer bestimmten Temperatur gewählt wird. Es ist vielmehr erkannt worden, daß die Abkühlung rascher erfolgt, wenn bei hoher Drahttemperatur die Tropfen größer und bei tiefer Temperatur kleiner gewählt werden. In weiterer Ausbildung der Erfindung nach der Hauptpatentanmeldung wird vorgeschlagen, zur Erzielung einer optimalen Kühlwirkung bei abnehmender Drahttemperatur eine kleinere Tropfengröße vorzusehen als bei höherer Temperatur.Further practical tests have shown that it is not a matter of indifference for the cooling effect which one Droplet size is chosen at a certain temperature. Rather, it has been recognized that the Cooling takes place more quickly if the droplets are larger at a high wire temperature and at a lower temperature be chosen smaller. In a further development of the invention according to the main patent application it is proposed to achieve an optimal cooling effect with decreasing wire temperature a Provide smaller droplet sizes than at higher temperatures.

Bei 100-kg-Drahtringen mit 8 und 24 mm Drahtdurchmesser wurden folgende Abkühlgeschwindigkeiten bei nur geringer Veränderung des Tropfendurchmessers gemessen:For 100 kg wire rings with 8 and 24 mm wire diameter were the following cooling rates with only a slight change in the droplet diameter measured:

Draht-Wire- Tropfendrops Wasserwater Luftair Abkühl
geschwindigkeitCool down
speed /Cs/ Cs QtI !"CU"
messerQtI! "CU"
knife größesize druckpressure druckpressure in0 in 0 beiat beiat 600° C600 ° C in mmin mm in μΐηin μΐη in mm WSin mm WS inatüinatü 900° C900 ° C 1,31.3 88th 1818th -500-500 0,50.5 5,05.0 2,22.2 1313th -500-500 3,03.0 3,83.8 0,80.8 2424 1818th -500-500 0,50.5 3,63.6 0,90.9 1313th -500-500 3,03.0 2,22.2

3030th

,35, 35

Etwa 80% aller Tropfen harten einen kleineren und etwa 20 °/o einen größeren Durchmesser als den angegebenen.About 80% of all drops had a smaller and about 20% larger diameter than that specified.

Weiterhin hat es sich gezeigt, daß das Versprühen des Kühlmittels aus dem mit Düsen bestückten Doppelrohr zu einer besseren Nebelbildung führt, wenn das Doppelrohr am oberen und unteren Ende durch eine geschlossene Platte abgedeckt wird. Diese gleichmäßigere Nebelausbildung hat ein gleichmäßigeres Abkühlen des Ringes zur Folge. Die Abdeckplatten müssen jedoch trocken gehalten werden, um eine schnellere Abkühlung der unmittelbar an den Platten anliegenden Windungen der Drahtringe auszuschließen. Diese Wirkung wird leicht dadurch erzielt, daß Luftdüsen, die im Vergleich zu den Zweistoffdüsen eine geringere Strömungsgeschwindigkeit der austretenden Luft erzeugen, auf dem Doppelrohr unmittelbar unter der oberen und über der unteren Platte angeordnet sind. Die aus diesen Luftdüsen ausströmende Luft hält den Kühlmittelnebel von den Abdeckplatten fern und verhindert damit das Benetzen der Platten mit dem Kühlmittel.Furthermore, it has been shown that the spraying of the coolant from the double tube equipped with nozzles leads to better fog formation if the double tube at the upper and lower end a closed plate is covered. This more even fog formation has a more even one Cooling of the ring as a result. However, the cover plates must be kept dry in order to achieve a to exclude faster cooling of the turns of the wire rings lying directly on the plates. This effect is easily achieved by the fact that air nozzles, compared to the two-substance nozzles generate a lower flow velocity of the exiting air, directly on the double pipe are arranged below the upper and above the lower plate. The one flowing out of these air nozzles Air keeps the coolant mist away from the cover plates and thus prevents wetting the plates with the coolant.

Da die Gleichmäßigkeit der Kühlung des Drahtringes nicht gegeben ist, wenn auf Grund der Gegebenheiten der Walzenstraße sich die Temperaturen im Ring wesentlich unterscheiden, und nach dem Haspeln der Anfang des Drahtringes in der Regel kälter ist als das Ende, wird weiterhin vorgeschlagen, das Doppelrohr im unteren Teil mit weniger und nach oben zunehmend mit mehr Düsen zu bestücken oder aber bei gleichmäßiger Belegung des Doppelrohres die Düsenöffnungen der unteren Düsen enger und nach oben hin zunehmend weiter zu wählen, um die Beaufschlagung des Ringes mit Kühlmittel seinem vorgegebenen Temperaturfeld anzupassen.Since the uniformity of the cooling of the wire ring is not given, if due to the circumstances the rolling mill, the temperatures in the ring differ significantly, and after Reels the beginning of the wire ring is usually colder than the end, it is still suggested to equip the double tube with fewer nozzles in the lower part and increasingly with more nozzles towards the top or if the double pipe is evenly occupied, the nozzle openings of the lower nozzles are narrower and to choose increasingly further upwards in order to act on the ring with coolant to adapt the given temperature field.

Bei geringer Durchlässigkeit des Drahtringes in radialer Richtung ist ebenso ein Durchstrahlen des Ringes mit dem verdüsten Kühlmittel in axialer Richtung möglich, wenn statt des Doppelrohres eine düsenbestückte Doppelwand verwendet wird, auf der die Achse des zu kühlenden Drahtringes senkrecht steht. Bei einer solchen Anordnung wird der vorgegebene Temperaturunterschied der unteren bzw. oberen Windungen des Ringes und der sich beim Kühlen einstellende Temperaturunterschied zwischen den den Düsen nahen und den Düsen fernen Windungen ausgeglichen, indem entweder der Ring gewendet oder aber mit zwei Doppelwänden gekühlt wird, die periodisch wechselnd das verdüste Kühlmittel ausstrahlen. Die Belegung der Doppelwand mit Düsen erfolgt vorteilhafterweise ringförmig und ist den Abmessungen des Ringes hinsichtlich des Innen- und Außendurchmessers angepaßt.With low permeability of the wire ring in the radial direction, radiation of the is also possible Ring with the atomized coolant in the axial direction is possible if instead of a double tube nozzle-fitted double wall is used, on which the axis of the wire ring to be cooled is perpendicular stands. With such an arrangement, the predetermined temperature difference becomes the lower or upper one Windings of the ring and the temperature difference between the two during cooling The nozzles close and the windings distant from the nozzles are balanced by either turning the ring or but it is cooled with two double walls, which periodically alternate radiating the atomized coolant. The double wall is advantageously covered with nozzles in an annular manner and corresponds to the dimensions of the ring adjusted with regard to the inner and outer diameter.

In den Zeichnungen sind zwei Ausführungsbeispiele dargestellt.Two exemplary embodiments are shown in the drawings.

In F i g. 1 ist das mit den Düsen 3 bestückte Doppelrohr 1 oben und unten durch die Platten 8 und 9 abgeschlossen. Die obere Platte 8 ist in der Höhe beweglich gehalten, sie legt sich auf den Drahtring 2 auf, wenn das Doppelrohr 1 in den Drahtring 2 von oben eingeführt wird. Die untere Platte 9 ist in diesem Ausführungsbeispiel fest angeordnet und in der Mitte mit einem Einsenkung 10 versehen, die zur Zentrierung des Doppelrohres 1 dient. Mit 4 und 5 sind die Zuführungen für Luft und Wasser gekennzeichnet. In Fig. 1 is the double tube equipped with nozzles 3 1 completed at the top and bottom by panels 8 and 9. The upper plate 8 is movable in height held, it lies on the wire ring 2 when the double pipe 1 in the wire ring 2 of is introduced above. The lower plate 9 is fixedly arranged in this embodiment and in the Center provided with a depression 10, which is used to center the double tube 1. With 4 and 5 the inlets for air and water are marked.

F i g. 2 zeigt zwei Doppelwände 11 und 12. Der zu kühlende Drahtring 2 liegt auf einem Rost 13. Punktiert (4) sind diejenigen Räume der Doppelwände, die die Luft führen, gestrichelt (5) diejenigen, die Wasser führen. Dargestellt ist der Zustand, in dem die obere Doppelwand 11 Kühlmittel versprüht. Die Doppelwände 11 und 12 strahlen einander ablösend das Kühlmittel durch die Düsen 3 aus.F i g. 2 shows two double walls 11 and 12. The wire ring 2 to be cooled lies on a grate 13. Dotted (4) are those spaces of the double walls that carry the air, dashed (5) those that Lead water. What is shown is the state in which the upper double wall 11 is spraying coolant. the Double walls 11 and 12 radiate the coolant through the nozzles 3, separating one another.

Claims (4)

Patentansprüche:Patent claims: 1. Mittel zum Kühlen von zu Ringen gehaspeltem Walzdraht, das Nebel ist, wie beim Kühlen einlagiger Drahtwindungen bekannt, nach Patentanmeldung P 12 79 605.3 (deutsche Auslegeschrift 1279 605), dadurch gekennzeichnet, daß bei abnehmender Drahttemperatur eine kleinere Tropfengröße vorgesehen ist als bei höherer Temperatur.1. Means for cooling coiled wire rod which is mist like cooling single-layer wire windings known, according to patent application P 12 79 605.3 (German Auslegeschrift 1279 605), characterized in that with decreasing wire temperature a smaller droplet size is provided than at a higher temperature. 2. Vorrichtung zur Erzeugung des Mittels zum Kühlen nach Anspruch 4 der Patentanmeldung P 12 79 605.3, dadurch gekennzeichnet, daß das Doppelrohr (1) an beiden Enden mit Platten (8; 9) versehen ist, die den Außendurchmesser der zu kühlenden Ringe (2) haben, und daß unmittelbar unter der oberen und oberhalb der unteren Platte Luftdüsen angeordnet sind.2. Device for generating the means for cooling according to claim 4 of the patent application P 12 79 605.3, characterized in that the double tube (1) at both ends with plates (8; 9) is provided, which have the outer diameter of the rings to be cooled (2), and that immediately air nozzles are arranged below the upper and above the lower plate. 3. Vorrichtung nach Anspruch 4 der Patentanmeldung P 12 79 605.3, dadurch gekennzeichnet, daß das Doppelrohr (1) entsprechend der Temperatur des zu kühlenden Drahtringes (2) mit Düsen (3) unterschiedlich stark belegt oder bei gleicher Belegung mit Düsen (3) unterschiedlichen Kühlmitteldurchsatzes versehen ist.3. Device according to claim 4 of patent application P 12 79 605.3, characterized in that that the double tube (1) according to the temperature of the wire ring to be cooled (2) with Nozzles (3) occupied differently or with the same occupancy with nozzles (3) different Coolant throughput is provided. 4. Vorrichtung nach Anspruch 4 der Patentanmeldung P 12 79 605.3, dadurch gekennzeichnet, daß das Doppelrohr (1) als eine mit den Düsen bestückte Doppelwand (11; 12) ausgebildet ist, die oberhalb oder/und unterhalb des Ringes (2) angeordnet ist.4. Apparatus according to claim 4 of patent application P 12 79 605.3, characterized in that that the double pipe (1) is designed as a double wall (11; 12) fitted with the nozzles is, which is arranged above and / or below the ring (2). Hierzu 1 Blatt Zeichnungen1 sheet of drawings
DER41199A 1964-12-21 1965-07-30 Means and device for cooling wire rod coiled into rings Withdrawn DE1296113B (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
DER39509A DE1279605B (en) 1964-12-21 1964-12-21 Means and device for cooling wire rod coiled into rings
DER41199A DE1296113B (en) 1964-12-21 1965-07-30 Means and device for cooling wire rod coiled into rings
DE1965R0042212 DE1296112B (en) 1964-12-21 1965-12-14 Device for cooling wire rod coiled into rings
FR42982A FR1464966A (en) 1964-12-21 1965-12-20 Method and device for cooling yarn bundles
SE16435/65A SE319145B (en) 1964-12-21 1965-12-20
NL6516653A NL6516653A (en) 1964-12-21 1965-12-21
GB54103/65A GB1112160A (en) 1964-12-21 1965-12-21 Process and device for cooling heated wire coils
US515329A US3339373A (en) 1964-12-21 1965-12-21 Process and device for cooling wire coils

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DER39509A DE1279605B (en) 1964-12-21 1964-12-21 Means and device for cooling wire rod coiled into rings
DER41199A DE1296113B (en) 1964-12-21 1965-07-30 Means and device for cooling wire rod coiled into rings

Publications (1)

Publication Number Publication Date
DE1296113B true DE1296113B (en) 1969-05-29

Family

ID=25991844

Family Applications (2)

Application Number Title Priority Date Filing Date
DER39509A Withdrawn DE1279605B (en) 1964-12-21 1964-12-21 Means and device for cooling wire rod coiled into rings
DER41199A Withdrawn DE1296113B (en) 1964-12-21 1965-07-30 Means and device for cooling wire rod coiled into rings

Family Applications Before (1)

Application Number Title Priority Date Filing Date
DER39509A Withdrawn DE1279605B (en) 1964-12-21 1964-12-21 Means and device for cooling wire rod coiled into rings

Country Status (6)

Country Link
US (1) US3339373A (en)
DE (2) DE1279605B (en)
FR (1) FR1464966A (en)
GB (1) GB1112160A (en)
NL (1) NL6516653A (en)
SE (1) SE319145B (en)

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US4682615A (en) * 1984-07-02 1987-07-28 Fsi Corporation Rinsing in acid processing of substrates
US4801335A (en) * 1984-07-02 1989-01-31 Fsi Corporation Rinsing in acid processing of substrates

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DE1296114B (en) * 1965-12-22 1969-05-29 Roechling Sche Eisen Means and device for cooling during the coiling of wire rod
DE1602129B1 (en) * 1967-06-21 1970-08-27 Roechlingsche Eisen & Stahl Cooling pipe for cooling rolled material
GB1418400A (en) * 1973-03-14 1975-12-17 Nippon Kokan Kk Method and apparatus for cooling steel
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US4110092A (en) * 1977-01-26 1978-08-29 Nippon Kokan Kabushiki Kaisha Method of apparatus for cooling inner surface of metal pipe
US4236551A (en) * 1977-05-05 1980-12-02 Veb Schwermaschinenbau-Kombinat Ernst Thalmann Magdeburg Method of and apparatus for cooling rolled wire
US4242153A (en) * 1978-10-16 1980-12-30 Morgan Construction Company Methods for hot rolling and treating rod
DD246570A1 (en) * 1986-03-13 1987-06-10 Thaelmann Schwermaschbau Veb VENTILATION DEVICE FOR COOLING ROLLING RINGS
EP0312843B1 (en) * 1987-10-22 1992-12-16 Sms Schloemann-Siemag Aktiengesellschaft Process for heat exchange and its use in the controlled cooling of rolled products
JP2721861B2 (en) * 1988-09-16 1998-03-04 トーア・スチール株式会社 Direct quenching method for hot rolled steel wire
US5131233A (en) * 1991-03-08 1992-07-21 Cray Computer Corporation Gas-liquid forced turbulence cooling
US5220804A (en) * 1991-12-09 1993-06-22 Isothermal Systems Research, Inc High heat flux evaporative spray cooling
US5992159A (en) * 1995-05-25 1999-11-30 Edwards; Christopher Francis Method and apparatus for heat extraction by controlled spray cooling
CH690095A5 (en) * 1995-12-07 2000-04-28 Tetra Pak Plastics Ltd Tetra P A heating device for plastics processing machines.
US5592823A (en) * 1996-03-12 1997-01-14 Danieli United Variable soft cooling header
US5943211A (en) * 1997-04-18 1999-08-24 Raytheon Company Heat spreader system for cooling heat generating components
US5907473A (en) * 1997-04-04 1999-05-25 Raytheon Company Environmentally isolated enclosure for electronic components
CN102847732B (en) * 2012-08-20 2015-03-25 燕山大学 Hot rolling spray cooling method for large cylinder
NO336863B1 (en) * 2013-06-18 2015-11-16 Vetco Gray Scandinavia As Underwater heat exchanger
CN103962399B (en) * 2014-04-08 2016-04-13 中天钢铁集团有限公司 P/F line loose coil colling station
CN104745779B (en) * 2015-04-22 2017-09-08 徐工集团工程机械股份有限公司 A kind of multistage induction hardening equipment
DE102018115879A1 (en) 2018-06-29 2020-01-23 Uwe Richter Method and device for contour-like tempering of shell-shaped molds

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US1013056A (en) * 1911-08-07 1911-12-26 William J Powney Apparatus for treating wire rods.
US1933412A (en) * 1933-04-11 1933-10-31 Charles J Brown Spraying device for hot rod mill reels
DE967194C (en) * 1948-10-02 1957-10-24 Westfaelische Union Ag Method for tempering steel wire
DE1082215B (en) * 1957-11-30 1960-05-25 Willy Aumann K G Device for winding wire in rosette shape into a pot-shaped, rotating drum
DE1906528U (en) * 1964-10-09 1964-12-17 Verwaltungsgesellschaft Moelle WIRE REEL WITH WATER COOLING.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4682615A (en) * 1984-07-02 1987-07-28 Fsi Corporation Rinsing in acid processing of substrates
US4801335A (en) * 1984-07-02 1989-01-31 Fsi Corporation Rinsing in acid processing of substrates

Also Published As

Publication number Publication date
SE319145B (en) 1970-01-12
GB1112160A (en) 1968-05-01
US3339373A (en) 1967-09-05
FR1464966A (en) 1967-01-06
DE1279605B (en) 1968-10-10
NL6516653A (en) 1966-06-22

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E77 Valid patent as to the heymanns-index 1977
8340 Patent of addition ceased/non-payment of fee of main patent