US3387783A - Apparatus for atomizing molten solids - Google Patents

Apparatus for atomizing molten solids Download PDF

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US3387783A
US3387783A US507837A US50783765A US3387783A US 3387783 A US3387783 A US 3387783A US 507837 A US507837 A US 507837A US 50783765 A US50783765 A US 50783765A US 3387783 A US3387783 A US 3387783A
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nozzle
casing
nozzle member
atomizing
liquid
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US507837A
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Schellenberg Rolf
Nitzschke Karl-Heinz
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BASF SE
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BASF SE
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
    • B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
    • B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
    • B01J2/02—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/06—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane
    • B05B7/062—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet
    • B05B7/066—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet with an inner liquid outlet surrounded by at least one annular gas outlet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/10—Spray pistols; Apparatus for discharge producing a swirling discharge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/16—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed
    • B05B7/1606—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed the spraying of the material involving the use of an atomising fluid, e.g. air
    • B05B7/1613—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed the spraying of the material involving the use of an atomising fluid, e.g. air comprising means for heating the atomising fluid before mixing with the material to be sprayed
    • B05B7/162—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed the spraying of the material involving the use of an atomising fluid, e.g. air comprising means for heating the atomising fluid before mixing with the material to be sprayed and heat being transferred from the atomising fluid to the material to be sprayed
    • B05B7/1626—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed the spraying of the material involving the use of an atomising fluid, e.g. air comprising means for heating the atomising fluid before mixing with the material to be sprayed and heat being transferred from the atomising fluid to the material to be sprayed at the moment of mixing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
    • F23D11/10—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour

Definitions

  • ABSTRACT OF THE DISCLOSURE Apparatus for atomizing a liquid such as a molten salt or metal by means of compressed gas, consisting of a diskshaped nozzle casing and a nozzle member pressed onto the casing by means of a support. Spacer ring insulates the nozzle casing from the nozzle member. Nozzle casing is provided with a radial slit and constructed as an induction coil. Electric high-frequency current is supplied to the nozzle casing to heat the nozzle member by induction.
  • This invention relates to a method of atomizing liquids and particularly to a method of atomizing liquids at very high temperatures, for example molten salts or molten metals.
  • the invention also relates to apparatus suitable for carrying out the method.
  • liquid substances may be atomized by means of a gaseous or vaporous pressure medium.
  • the nozzle member located in the path of discharge of the liquid substance may be heated.
  • This heating may be gas heating, electrical heating or electrical induction heating, the latter type of heating being very effective. It is a disadvantage of the said prior part types of heating that it is impossible to heat the nozzle member uniformly over its Whole length and particularly the tip of the nozzle member cannot be heated.
  • the inner wall is heated electrically by induction, the cold compressed gas is supplied to the outer nozzle chamher, is heated therein While at the same time cooling the I, outer wall and is ejected through the lower opening of the outer nozzle chamber to atomize the liquid, the liquid being supplied at the same time to the lower opening of the inner nozzle chamber and being atomized here by the heated compressed gas as it issues.
  • the compressed gas has a twisting motion imparted to it in the outer nozzle chamber.
  • Apparatus for atomizing liquids comprises heat insulation between the nozzle member forming the inner wall and the outer nozzle casing forming the outer Wall and the arrangement of the nozzle casing as an induction coil in a high frequency circuit.
  • the nozzle member is formed as a double cone in the direction of the opening of the inner nozzle chamber and ends in an apex.
  • the method according to this invention makes it possible to heat the entire nozzle member, above all its apex, to temperatures up to about 1600" C.
  • the nozzle casing is made of a substance having good thermal conductivity, for example copper, and it is connected to a source of high frequency current in such a way that it acts as an induction coil.
  • the way in which the compressed gas flowing through the nozzle is directed through the outer nozzle chamber ensures that the gas serves not only to atomize the liquid but also to cool the nozzle casing constituting the induction coil.
  • the nozzle member is heated inductively.
  • a heat-proof insulation ring of aluminum oxide or magnesium oxide ensures the spacing of the nozzle member by about 1 to 2 mm. from the induction coil or nozzle casing.
  • the field line density is very high at the apex of the nozzle member. The maximum temperature is therefore reached at the apex, and this is important in atomizing salts or metals having a high melting point.
  • FIG. 1 is a cross-section through the apparatus and FIGURE 2 is a...
  • FIG. 3 top plan view of the apparatus partly in section with the portion enclosed within the circle 3 of FIG. 2 shown on a larger scale in FIG. 3.
  • the apparatus comprises a nozzle casing 1 which at the same time constitutes an induction coil.
  • a nozzle member 2 is located in the nozzle casing 1.
  • the nozzle member 2 is centered and insulated by means of a spacer ring 3 and is pressed onto the nozzle casing 1 by a support 4.
  • a supply pipe 5 is mounted centrally in the support 4 for the supply of the liquid to be atomized.
  • the supply pipe 5 opens into a. passage 6 in the nozzle member.
  • the support 4 is pressed onto the nozzle casing by screws 7.
  • liners 9 are provided in the holes 8 in the support 4, and a Washer 10 is provided on top of each of the liners 9 to distribute the pressure of the screws.
  • the nozzle casing 1 is provided with a cut 11 extending over half the diameter of the casing.
  • a packing 12 is located in the cut 11 to insulate the two portions of the nozzle casing 1. The two portions are pressed together by a screw 13.
  • a liner 15 with a washer 16 is provided in a hole 14 to insulate the screw from the casing 1. Electric current is supplied through screws 17, 18 and terminals 19, 20 arranged on either side of the cut 11.
  • the medium for atomizing the liquid flows through a bore 21 in the nozzle casing 1 into a cavity 22 in a tangential direction and leaves the cavity 22 through a double conical gap 23 and a gap 24 between the nozzle casing 1 and the nozzle member 2.
  • Apparatus for atomizing a liquid such as a molten salt or molten metal by means of compressed gas comprising a disk-shaped nozzle casing having a cavity with a nozzle opening, a nozzle member mounted in said cavity with its nozzle tip in said opening, an insulating spacer ring between the nozzle casing and the nozzle member, said casing having a radial slit therethrough, an insulating packing in said slit, said nozzle casing having an annular cavity about said nozzle member for the supply of said gas to said opening about said nozzle tip, terminals on said casing for the supply of high-frequency electric current to the nozzle casing, which functions as an induction coil, said nozzle member thereby being electrically heated by induction, and a tube means connected to said nozzle member for the supply of the liquid to be atomized.
  • Apparatus for atomizing a liquid such as a molten salt or molten metal by means of compressed gas comprising a disk-shaped nozzle casing having therein a central, conical, axial cavity With a nozzle opening, a nozzle member having a conical segment in said cavity with its nozzle tip in said opening, an insulating spacer ring between the nozzle casing and the Wall of said cavity, said casing having a radial slit therethrough, an insulating packing in said slit, said nozzle casing having an annular cavity about said nozzle member for the supply of said gas to said opening about said nozzle tip, terminals on said casing for said nozzle member for the supply of 4 high-frequency electric current to the nozzle casing, which functions as an induction coil, said nozzle member thereby being electrically heated by induction, and tube means connected to said nozzle member for the supply of the liquid to be atomized.

Description

June 1968 R. SCHELLENBERG ETAL 3,3
APPARATUS FOR ATOMIZING MOLTEN SOLIDS Filed Nov. 15, 1965 INVENTORS: ROLF SCHELLEN BERG KARL-HEINZ NITZSCHKE ATT'YS United States Patent 3,387,783 APPARATUS FOR ATOMIZING MOLTEN SOLIDS Rolf Schellenberg, Mannheim, and Karl-Heinz Nitzschke, Ludwigshafen (Rhine), Germany, assignors to Badische Anilin- 8; Soda-Fabrik Aktiengesellschaft, Ludwigshafen (Rhine), Rheinland-Pfalz, Germany Filed Nov. 15, 1965, Ser. No. 507,837 Claims priority, application Germany, Nov. 18, 1964, B 79,395 2 Claims. (Cl. 239-81) ABSTRACT OF THE DISCLOSURE Apparatus for atomizing a liquid such as a molten salt or metal by means of compressed gas, consisting of a diskshaped nozzle casing and a nozzle member pressed onto the casing by means of a support. Spacer ring insulates the nozzle casing from the nozzle member. Nozzle casing is provided with a radial slit and constructed as an induction coil. Electric high-frequency current is supplied to the nozzle casing to heat the nozzle member by induction.
This invention relates to a method of atomizing liquids and particularly to a method of atomizing liquids at very high temperatures, for example molten salts or molten metals. The invention also relates to apparatus suitable for carrying out the method.
It is known that liquid substances may be atomized by means of a gaseous or vaporous pressure medium.
It is also known that the nozzle member located in the path of discharge of the liquid substance may be heated. This heating may be gas heating, electrical heating or electrical induction heating, the latter type of heating being very effective. It is a disadvantage of the said prior part types of heating that it is impossible to heat the nozzle member uniformly over its Whole length and particularly the tip of the nozzle member cannot be heated.
It is an object of the present invention to provide a method of atomizing liquids which does not have the disadvantages of the prior art methods, above all those disadvantages associated with the heating of the nozzle, and which therefore may be used for atomization of liquid (molten) salts or metms at high temperature. It is a further object of the invention to provide apparatus for carrying out the said method.
According to this invention, in a method in which a liquid is atomized by means of compressed gas in a nozzle comprising an inner nozzle chamber, an adjacent outer nozzle chamber, an inner wall separating the two chambers and an outer wall surrounding the outer nozzle chamher, the inner wall is heated electrically by induction, the cold compressed gas is supplied to the outer nozzle chamher, is heated therein While at the same time cooling the I, outer wall and is ejected through the lower opening of the outer nozzle chamber to atomize the liquid, the liquid being supplied at the same time to the lower opening of the inner nozzle chamber and being atomized here by the heated compressed gas as it issues.
The compressed gas has a twisting motion imparted to it in the outer nozzle chamber.
Apparatus for atomizing liquids according to this invention comprises heat insulation between the nozzle member forming the inner wall and the outer nozzle casing forming the outer Wall and the arrangement of the nozzle casing as an induction coil in a high frequency circuit.
The nozzle member is formed as a double cone in the direction of the opening of the inner nozzle chamber and ends in an apex.
3,387,783 Patented June 11, 1968 ice The method according to this invention makes it possible to heat the entire nozzle member, above all its apex, to temperatures up to about 1600" C. For this purpose the nozzle casing is made of a substance having good thermal conductivity, for example copper, and it is connected to a source of high frequency current in such a way that it acts as an induction coil.
The way in which the compressed gas flowing through the nozzle is directed through the outer nozzle chamber ensures that the gas serves not only to atomize the liquid but also to cool the nozzle casing constituting the induction coil.
The nozzle member is heated inductively. A heat-proof insulation ring of aluminum oxide or magnesium oxide ensures the spacing of the nozzle member by about 1 to 2 mm. from the induction coil or nozzle casing. The field line density is very high at the apex of the nozzle member. The maximum temperature is therefore reached at the apex, and this is important in atomizing salts or metals having a high melting point.
Apparatus suitable for carrying out the method according to this invention is shown by Way of example in the accompanying drawings in which'FIG-URE l is a cross-section through the apparatus and FIGURE 2 is a...
top plan view of the apparatus partly in section with the portion enclosed within the circle 3 of FIG. 2 shown on a larger scale in FIG. 3.
The apparatus comprises a nozzle casing 1 which at the same time constitutes an induction coil. A nozzle member 2 is located in the nozzle casing 1. The nozzle member 2 is centered and insulated by means of a spacer ring 3 and is pressed onto the nozzle casing 1 by a support 4. A supply pipe 5 is mounted centrally in the support 4 for the supply of the liquid to be atomized. The supply pipe 5 opens into a. passage 6 in the nozzle member. The support 4 is pressed onto the nozzle casing by screws 7. To insulate the support 4 from the nozzle casing 1, liners 9 are provided in the holes 8 in the support 4, and a Washer 10 is provided on top of each of the liners 9 to distribute the pressure of the screws.
The nozzle casing 1 is provided with a cut 11 extending over half the diameter of the casing. A packing 12 is located in the cut 11 to insulate the two portions of the nozzle casing 1. The two portions are pressed together by a screw 13. A liner 15 with a washer 16 is provided in a hole 14 to insulate the screw from the casing 1. Electric current is supplied through screws 17, 18 and terminals 19, 20 arranged on either side of the cut 11. The medium for atomizing the liquid flows through a bore 21 in the nozzle casing 1 into a cavity 22 in a tangential direction and leaves the cavity 22 through a double conical gap 23 and a gap 24 between the nozzle casing 1 and the nozzle member 2.
Owing to the favorable adaptation of the high frequency generator to the nozzle casing constructed as an induction coil, and owing to the inductive heating of the nozzle member, it is possible without difiiculty to heat the entire nozzle casing to a temperature of about 1600 C. It is therefore possible to atomize metals or salts having high melting points in a simple way.
We claim:
1. Apparatus for atomizing a liquid such as a molten salt or molten metal by means of compressed gas comprising a disk-shaped nozzle casing having a cavity with a nozzle opening, a nozzle member mounted in said cavity with its nozzle tip in said opening, an insulating spacer ring between the nozzle casing and the nozzle member, said casing having a radial slit therethrough, an insulating packing in said slit, said nozzle casing having an annular cavity about said nozzle member for the supply of said gas to said opening about said nozzle tip, terminals on said casing for the supply of high-frequency electric current to the nozzle casing, which functions as an induction coil, said nozzle member thereby being electrically heated by induction, and a tube means connected to said nozzle member for the supply of the liquid to be atomized.
2. Apparatus for atomizing a liquid such as a molten salt or molten metal by means of compressed gas comprising a disk-shaped nozzle casing having therein a central, conical, axial cavity With a nozzle opening, a nozzle member having a conical segment in said cavity with its nozzle tip in said opening, an insulating spacer ring between the nozzle casing and the Wall of said cavity, said casing having a radial slit therethrough, an insulating packing in said slit, said nozzle casing having an annular cavity about said nozzle member for the supply of said gas to said opening about said nozzle tip, terminals on said casing for said nozzle member for the supply of 4 high-frequency electric current to the nozzle casing, which functions as an induction coil, said nozzle member thereby being electrically heated by induction, and tube means connected to said nozzle member for the supply of the liquid to be atomized.
ReEerences Cited UNITED STATES PATENTS 2,058,971 10/1936 Forton 239-79 2,225,168 12/ 1940 Forton 239424 X 2,434,911 H1943 Denyssen 23979 X ALLEN N. KNOWLES, Primary Examiner.
M. HENSON WOOD, IR., Examiner.
H. NATIER, Assistant Examiner.
US507837A 1964-11-18 1965-11-15 Apparatus for atomizing molten solids Expired - Lifetime US3387783A (en)

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0220418A1 (en) * 1985-09-24 1987-05-06 Gerking, Lüder, Dr.-Ing. Process and apparatus for making very fine spherical powder
WO1987006858A1 (en) * 1986-05-14 1987-11-19 Slautterback Corporation Hot-melt sputtering apparatus
US4891249A (en) * 1987-05-26 1990-01-02 Acumeter Laboratories, Inc. Method of and apparatus for somewhat-to-highly viscous fluid spraying for fiber or filament generation, controlled droplet generation, and combinations of fiber and droplet generation, intermittent and continuous, and for air-controlling spray deposition
US4907741A (en) * 1987-04-09 1990-03-13 Acumeter Laboratories, Inc. Poppet-valve-controlled fluid nozzle applicator
EP0451552A1 (en) * 1990-04-09 1991-10-16 Leybold Aktiengesellschaft Process and apparatus for producing a liquid metal jet
WO1992005903A1 (en) * 1990-10-09 1992-04-16 Iowa State University Research Foundation, Inc. A melt atomizing nozzle and process
US5228620A (en) * 1990-10-09 1993-07-20 Iowa State University Research Foundtion, Inc. Atomizing nozzle and process
WO1993019843A1 (en) * 1992-03-31 1993-10-14 Santrade Ltd. Drop-producing device
US5272718A (en) * 1990-04-09 1993-12-21 Leybold Aktiengesellschaft Method and apparatus for forming a stream of molten material
US5468133A (en) * 1992-07-27 1995-11-21 General Electric Company Gas shield for atomization with reduced heat flux
CN105943246A (en) * 2016-04-23 2016-09-21 泉州智造者机械设备有限公司 Absorbing material rolling-cut device of numerical control adult paper diaper production line

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9316522D0 (en) * 1993-08-09 1993-09-22 Hopkins William Apparatus for and methods of producing a particulate spray
ES2745113T3 (en) 2010-04-09 2020-02-27 Pacira Pharmaceuticals Inc Method for formulating multivesicular liposomes
CN113681017B (en) * 2021-09-22 2023-06-02 北京机科国创轻量化科学研究院有限公司 Gas heating spiral-flow type tight coupling circular seam nozzle

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2058971A (en) * 1935-12-19 1936-10-27 Harold R Forton Apparatus for spraying metals
US2225168A (en) * 1938-03-03 1940-12-17 Harold R Forton Metal spraying apparatus
US2434911A (en) * 1944-12-26 1948-01-27 Standard Telephones Cables Ltd Heating and spraying device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2058971A (en) * 1935-12-19 1936-10-27 Harold R Forton Apparatus for spraying metals
US2225168A (en) * 1938-03-03 1940-12-17 Harold R Forton Metal spraying apparatus
US2434911A (en) * 1944-12-26 1948-01-27 Standard Telephones Cables Ltd Heating and spraying device

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4721252A (en) * 1985-02-22 1988-01-26 Slautterback Corporation Hot-melt sputtering apparatus
EP0220418A1 (en) * 1985-09-24 1987-05-06 Gerking, Lüder, Dr.-Ing. Process and apparatus for making very fine spherical powder
WO1987006858A1 (en) * 1986-05-14 1987-11-19 Slautterback Corporation Hot-melt sputtering apparatus
US4907741A (en) * 1987-04-09 1990-03-13 Acumeter Laboratories, Inc. Poppet-valve-controlled fluid nozzle applicator
US4891249A (en) * 1987-05-26 1990-01-02 Acumeter Laboratories, Inc. Method of and apparatus for somewhat-to-highly viscous fluid spraying for fiber or filament generation, controlled droplet generation, and combinations of fiber and droplet generation, intermittent and continuous, and for air-controlling spray deposition
US5272718A (en) * 1990-04-09 1993-12-21 Leybold Aktiengesellschaft Method and apparatus for forming a stream of molten material
EP0451552A1 (en) * 1990-04-09 1991-10-16 Leybold Aktiengesellschaft Process and apparatus for producing a liquid metal jet
WO1992005903A1 (en) * 1990-10-09 1992-04-16 Iowa State University Research Foundation, Inc. A melt atomizing nozzle and process
US5228620A (en) * 1990-10-09 1993-07-20 Iowa State University Research Foundtion, Inc. Atomizing nozzle and process
US5125574A (en) * 1990-10-09 1992-06-30 Iowa State University Research Foundation Atomizing nozzle and process
WO1993019843A1 (en) * 1992-03-31 1993-10-14 Santrade Ltd. Drop-producing device
US5401938A (en) * 1992-03-31 1995-03-28 Santrade Ltd. Rotary drop former with electrical inductive heater
US5468133A (en) * 1992-07-27 1995-11-21 General Electric Company Gas shield for atomization with reduced heat flux
CN105943246A (en) * 2016-04-23 2016-09-21 泉州智造者机械设备有限公司 Absorbing material rolling-cut device of numerical control adult paper diaper production line
CN105943246B (en) * 2016-04-23 2019-08-30 泉州智造者机械设备有限公司 The absorbing material rolling cut equipment of numerical control adult diaper production line

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Publication number Publication date
DE1458002B2 (en) 1972-02-24
BE672424A (en) 1966-05-17
GB1122660A (en) 1968-08-07
DE1458002A1 (en) 1968-11-28

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