US3665734A - Apparatus for finishing fibrous material - Google Patents

Apparatus for finishing fibrous material Download PDF

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Publication number
US3665734A
US3665734A US871361A US87136169A US3665734A US 3665734 A US3665734 A US 3665734A US 871361 A US871361 A US 871361A US 87136169 A US87136169 A US 87136169A US 3665734 A US3665734 A US 3665734A
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Prior art keywords
chamber
path
air
compartment
chambers
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US871361A
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English (en)
Inventor
Paul Hauser
Walter Pfister
Hans Ulrich Stucki
Heinz Teuwen
Heinrich Fuhring
Johannes Helmut Sieber
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.)
Boehler & Weber Kg-Maschinenfabrik-Augsburg
Bohler & Weber KG Maschinenfab
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Bohler & Weber KG Maschinenfab
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
    • D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
    • D06P1/90—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using dyes dissolved in organic solvents or aqueous emulsions thereof
    • D06P1/92—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using dyes dissolved in organic solvents or aqueous emulsions thereof in organic solvents
    • D06P1/922—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using dyes dissolved in organic solvents or aqueous emulsions thereof in organic solvents hydrocarbons
    • D06P1/924—Halogenated hydrocarbons
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
    • D06B21/00—Successive treatments of textile materials by liquids, gases or vapours
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
    • D06B9/00—Solvent-treatment of textile materials
    • D06B9/02—Solvent-treatment of textile materials solvent-dyeing
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M23/00—Treatment of fibres, threads, yarns, fabrics or fibrous goods made from such materials, characterised by the process
    • D06M23/10—Processes in which the treating agent is dissolved or dispersed in organic solvents; Processes for the recovery of organic solvents thereof
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
    • D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
    • D06P1/44—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders

Definitions

  • ABSTRACT Fibrous material in web or filament form, to be dyed or otherwise chemically treated is successively passed through a plurality of chambers including a treatment chamber in which it is subjected to the spray of a fluid, a drying chamber which may be subdivided into several compartments, and an intervening reaction chamber in which a controlled amount of moisture is added and which may be preceded by a preconditioning chamber provided with temperature-control means.
  • Air is forcibly circulated, with the aid of a primary blower, from a location near the inlet end of the treatment chamber to a point of the drying chamber remote from the treatment chamber whereby this air passes through the interconnected chambers in counter-current to the treated material.
  • Each chamber may also be provided with an individual secondary air path containing a blower for generating a flow which passes only through that chamber in counterflow to the treated material.
  • An apparatus comprises means for the saturation of the goods with a liquid, as for instance in a padding machine, in conjunction with transport arrangements consisting of rollers or the like for the guiding a web of textile material and a recovery section for volatile condensable substances, the two sections being interconnected by a forced-circulation path including blower means, a condensor and, if necessary, an air heater.
  • the apparatus according to the invention aims at avoiding the above-mentioned disadvantages and achieves an economical drying process with the least expense. At the same time in the whole drying zone a favorable and even concentration gradient between the textile material and the surrounding air for a uniform deposition of the finishing chemicals is achieved.
  • the treatment chamber of the apparatus according to the invention is followed by a drying chamber whose walls surround a section of traveling material moving vertically, the recovery section being connected to this drying chamber by the aforementioned path forming a closed circuit with a suction side in the area of the entry of the material into the treatment chamber and with a high pressure side in the area of the exit of the material from the drying chamber.
  • a number of drying chambers are provided which are joined with their vertical sides through which the web of material travels in alternating directions with the aid of reversing rollers or the like.
  • the drying air flows over the material in a counter-current whereby a progressive enrichment of the air with solvent vapors is achieved with a roughly constant concentration gradient.
  • the chambers are formed as adjoining compartments within a closed housing subdivided by vertical partitions.
  • FIG. 1 is, a schematic side view of the apparatus for the finishing of material in web form in solvent according to the invention
  • FIG. 2 is, a schematic side view of a reaction chamber which is preceded by a dyeingmachine;
  • FIGS. 3 and 4 show an arrangement for the preconditioning of a continuous length of fabric
  • FIG. 5 is a diagram of a cleaning and finishing plant.
  • the cloth 1 travels through the treating means 2 which consists of the chassis or liquid-containing trough 3 and the squeezing rollers 4, and then enters the treatment chamber 5. Its direction is changed by the rollers 6 and then it passes approximately in a straight line, yet in alternating directions, through a series of drying chambers 7, 8 and 9 which are situated beside chamber 5.
  • the chambers are formed inside the closed housing 11 by dividing walls or partitions 10.
  • the fan 12 and, on its downstream side, the cooler 13 are arranged.
  • the suction side of the fan 12 is in turn connected via a duct 15 with an intake port 15a to the entrance section of chamber 5.
  • the cooler 13 is connected via a duct 16 with the exit of chamber 8. In this way a recovery circuit is formed in which the drying air passes successively, counter-current to the traveling material, through chambers 8, 7 and 5.
  • a heater 14 may be provided which is only indicated in dotted lines in the drawing.
  • the individual chambers 5, 7 and 8 can, as may be seen from the left-hand section of FIG. 1, be provided with a further fan 17' and an air heater 18 on its downstream side.
  • the fan is connected with its suction side via a duct 19 to one end of the chamber, so that a secondary air stream travels through the individual chamber in a closed circuit.
  • the heater 18. may be situated on the suction or on the high pressure side of the fan 17.
  • the heater 18 is disposed ahead of two sets of air jets 21, lying on both sides of the path of fabric 1, through which the material may be treated from both sides with hot air via a conduit 20 with discharge ports 20a, 20b.
  • Such an arrangement can be provided in each one of the chambers. For the sake of simplicity, however, this arrangement is shown in FIG.
  • a valve 23 or 23 of an arrangement which injects steam or water into the circuit is controlled by the hygrometer 22 in the duct 19 which measures the humidity of the air leaving the chamber.
  • the operation of the valve 23 or 23' by means of the hygrometer 22 takes place by a well-known electrical system and is therefore indicated only by the dotted line 24.
  • the injection of fine water droplets into the air circuit takes place advantageously before the entry of the air into the air heater.
  • the injection of steam can also be performed beyond the heater. In this way a certain relative humidity in the individual chambers may be created and constantly maintained.
  • the water recovery from the material leaving the drying chambers may alternatively be controlled by a recoverymeasuring device 55 which, by well-known means, is connected to the steam or water spray valves 23 or 23.
  • An air inlet is shown at 56.
  • drying chambers may be mounted side by side, so that the traveling materia] has to pass one after the other.
  • chambers which are disposed in series may be connected to a recovery section 12, 13.
  • recovery sections 12, 13 There can also be several recovery sections 12, 13 assigned to a smaller group of chambers.
  • fresh air may be drawn with the aid of a fan 26 which is mounted on an activated-carbon recovery stage 25.
  • final compartment 9 of the drying stage has a duct 27 forming an extraction circuit (in direction of the arrow) in order to recover the last traces of solvent.
  • the individual ducts 20, 27 may be provided with branch lines 28 which can be closed or opened and which lead into the atmosphere or to an activated-carbon recovery plant. It is further advantageous to have a suction duct 29 connected to the housing of the treating means which also leads to an activated-carbon recovery plant.
  • a separate reaction chamber in which certain accelerating reaction conditions may be created and in which the material is transported without any contact with the surroundings over a long stretch.
  • the length of this stretch depends on the kind and condition of the material, on the degree of pre-drying by extraction rollers 30 corresponding to rollers 4 of FIG. 1, and on the speed of movement of the material through the reaction zone.
  • the reaction is controlled by the creation of certain temperatures and humidities, for instance by the introduction of water or solvent vapor and also by the introduction of certain chemicals in their vapor phase.
  • the reaction chamber is preferentially arranged in such a way that the material travels through it vertically, since then the dyeing machine may be mounted directly underneath or above the chamber without the use of any direction-changing rollers.
  • the material leaves the dyeing machine and enters the reaction chamber 31 which is situated immediately above or underneath it, and the material is moved into the following drying zone (corresponding to chamber 7 of FIG. 1) only after, at the bottom end of chamber 31 its direction is changed by a deflecting roller 32 and a further pair of rollers 33.
  • a separate recovery section which consists of fan 34, cooler 35 and heater 36, so that air may circulate, according to arrows 37 and 38, through chamber 31.
  • the hygrometer 39 controls two valves 40 and 41 which are respectively connected to a water-spray arrangement or a steam inlet.
  • a regulating means 42 for the operation of the air heater or a regulating means 43 for the cooling water supplied to the cooler 35 are controlled by a device 44 in the air leaving the chamber, for instance a thermostat.
  • the vapor concentration in the chamber may also be controlled by two thermostats 45- and 46 which measure the temperature drop across the cooler 35.
  • another pipe 47 with valves may be connected to the circuit.
  • the various means described enable an increase in the speed of reaction by the creation of favorable reaction conditions for the absorption of the chemical by the swelling fibers through temperature control, through the maintenance of certain relative vapor concentrations of oleophilic and hydrophilic media and by the addition of condensation accelerators in vapor form.
  • the injection of steam or vapors of volatile chemicals increases the heat content of the drying air and the azeotropic drying conditions speed up the drying process itself.
  • the danger of condensation of the additive on the walls of the chamber may be avoided by the introduction of the steam or vapors into the hot air stream coming from the air heater ofthe air circuit.
  • the effective length of the reaction zone within chamber 31 may, within certain limits, be altered by the adjustment of the deflecting rollers 32 in the direction of arrow 48.
  • the invention provides for a preconditioning zone through which the material has to travel prior to the entrance into the reaction chamber or into the treating means and in which, according to fiber-content, it is treated with solvent or water vapor.
  • preconditioning chamber 49 is arranged in front of the squeeze rollers 30, forming part of a padding or impregnating unit, in which the material is passed through an atmosphere enriched with vapor (as schematically indicated at 53) and in which its direction is changed several times in the form of loops by deflecting rollers 50. in its lower region the chamber is filled with a liquid which is evaporated by means of the heating coil 51. The entry and exit of the material may be protected from vapor loss through cooling coils 52.
  • FIG. 4 shows a modified arrangement including a preconditioning chamber 49' with deflecting rollers 50, heating means 51' and cooling means 52' interposed between rollers 30 and treatment chamber 31.
  • the speed of the drive for the material may be regulated in dependence upon the solvent vapor concentration in one of the chambers, or in dependence upon the solvent content of the material itself.
  • a device 54 for measuring solvent-vapor concentration is provided in the outlet of the air from fresh-air chamber 9 which, in turn, can adjust by known means the speed of the transport means.
  • the disturbing effect of the direction-changing rollers may be avoided by temperature-conditioning of the rollers through suitable cooling and/or heating means.
  • FIG. 5 shows schematically a washing and finishing machine according to the invention.
  • the individual circuits are represented by lines in which an arrow indicates the direction of the flowing medium.
  • the necessary valves for the opening and closing of the individual branch lines are indicated schematically by crosses. Their adjustment, which is required to make and break the various connections, is ascertainable from the function of the individual components.
  • Pumps 61 and 62 may continuously draw solvent from the containers 57 and 58 and return same in a circuit (see direction of arrows) to these containers. This can take place directly (with valve 66 opened, valve 64 and 65 being closed) or by means of the filters 67 and 68 (valve 66 closed, valves 64 and 65 opened) so that the solvent is freed from solid impurities at the same time.
  • the solvent is sprayed through jets 63 onto the material 1 from both sides and then passed into the containers 57 and 58, the solvent flowing counter-current to the direction of movement of the material from container 58 into container 57.
  • For the complete regeneration of the solvent fluid may be drained to still 7 from filters 67 and 68 through the opening of valve 69.
  • the liquid collects in water separator 72 from where it flows to the storage tank 73 for the clean solvent. From storage tank 73 the solvent may be directly passed to the jets 75 via valve 74. The latter jets rinse the web 1, coming from container 58, once more with clean solvent. Via valve 76 the solvent from the storage tank 73 may also be introduced into the pump circuit.
  • the pumps 61 and 72 may be connected via pipes 93 and 94 with the still 70, so that the solvent which has originally been taken out of the storage tank 73 and which is used in the pump circuit may be recycled for regeneration.
  • the material 1 leaving the housing 60 may be directed via the squeezing rollers 77 through a pre-drying zone 78 before it enters the actual padding machine 79. In some instances it is also possible to forego the use of this pre-drying zone 78 which therefore has been indicated only in dotted lines.
  • the padding machine 79 for the treatment with finishing chemicals may, in similar fashion, be connected with a pump circuit including a filter and a still, as previously described. For the sake of clarity this is indicated in FIG. 5 only by means of the two pipeline branches 80 and 81 in which advantageously a strainer 82 is fitted into the suction side of the pump.
  • a storage tank 83, filled with a concentrate of the chemical to be deposited on the material 1, and a further storage tank 84, filled with a working-strength solution of the treating liquor, are connected via pipe 85 to the vessel 86 of the padding machine 79.
  • a closing means 87 for the container 83 is controlled by a device 88 which measures the specific gravity of the liquid in container 86, so that with falling concentration of the dissolved material in the treating liquid valve 87 opens and closes again.
  • a valve 89 is provided in the outlet of tank 84 which is controlled by a solvent-level gauge in container 86, for instance a float switch, so that with rising or falling level the outlet from tank 84 is closed or opened.
  • the two outlets 87 and 89 are electrically connected in such a way that the valve 89 of the working-concentration tank 84 may be opened only when the concentration of the chemical in the padding machine is correct and when the valve 87 of the concentrate tank 83 is closed.
  • the apparatus required for such measurement and control is well known and not described in detail. The control functions are, therefore, shown only schematically by means of the dotted lines 91 and 92.
  • the solvent which the material brings with it from the previous scouring stage unavoidably causes a dilution of the finishing liquid in the treating means as well as an increase in the liquid quantity in the container 86 of the treating means 79.
  • oleophilic solvent it is advantageous to provide on the suction side of the pump an addition funnel or the like, so that the emulsification of the additive takes place within the pump.
  • an ultrasonic vibrator By means of an ultrasonic vibrator, an excellent emulsification or dispersion of solvent-insoluble materials may be achieved in the container which holds the treatment liquor.
  • ultrasonic vibrators which are mounted in the chambers, the passing material is agitated and the reaction of the chemical on the material is improved.
  • dyestufis various classes of conventional texn'le dyes may be used, particularly those of the classes of nitro, azo, and anthrachinon dyestuffs.
  • so-called fat-soluble dyestuffs are to be considered which have no acid or saltforming groups, are often readily soluble in the organic carrier liquid and give full, deep colors.
  • dyestuffs which without being fat-soluble contain oleophilic components, for instance higher molecular-weight hydrocarbon residues, even if they contain acid or salt-forming groups as long as these are not used in their usual form as water-soluble alkali salts, are suitable.
  • EXAMPLE 3 For the dyeing of cloth made of cellulose-tri-acetate, an azo-dyestuff of the following formula is dissolved in the ratio of l in trichlorethylene. The solution is clarified and then entered into the treatment means. The cloth is passed through the bath at 8 meters per minute under the conditions mentioned in Example 1.
  • a strong yellow color is obtained.
  • a similar effect may be obtained when using perchlorethylene as solvent with a fabric consisting of cellulose-2,5-acetate.
  • This yellow dyeing can also be carried out when the described method is applied to a cloth of regenerated cellulose (viscose).
  • a substantially closed housing forming a plurality of adjoining chambers for material to be treated, including a treatment chamber with an inlet for said material followed by a drying chamber with an outlet for said material;
  • conduit means forming a forced-circulation path for solvent vapors from said treatment chamber, said path originating at a location of said treatment chamber proximal to said inlet and terminating at a location of said drying chamber remote from said treatment chamber;
  • blower means in said path for generating an air flow in said conduit means traversing said drying and treatment chambers in counter-current to said material.
  • drying chamber is subdivided into a first compartment close to said treatment chamber and at least one further compartment beyond said first compartment, said path tenninating at said further compartment.
  • drying chamber includes a final compartment beyond said further compartment, said final compartment being provided with additional blower means for recirculating air in a secondary path from a discharge side to an entrance side thereof.
  • said supply means comprises two sets of jets on opposite sides of the line of travel of said material through said treatment chamber, said forced-circulation path and said secondary air path having intake ports located in said treatment chamber at said opposite sides ahead of said sets of jets.
  • chambers include a reaction chamber between said treatment and drying chambers and a source of moisture for said reaction chamber.
  • Apparatus as defined in claim 17 wherein at least one of said chambers is provided with an individual duct, communicating therewith at the top and the bottom, and with additional blower means in said duct for circulating air therethrough and through the chamber in counterfiow to said material.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Dispersion Chemistry (AREA)
  • Treatment Of Fiber Materials (AREA)
US871361A 1964-06-05 1969-09-15 Apparatus for finishing fibrous material Expired - Lifetime US3665734A (en)

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CH736364 1964-06-05

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US (1) US3665734A (es)
BE (1) BE664964A (es)
DE (1) DE1469263B2 (es)
ES (1) ES313753A1 (es)
FR (1) FR1444332A (es)
GB (1) GB1109686A (es)
NL (1) NL6507107A (es)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3770375A (en) * 1971-12-22 1973-11-06 Pavena Ag Working process for an impregnation liquid for continuous treatment of a textile fiber band
US3828587A (en) * 1972-04-03 1974-08-13 Riggs & Lombard Inc Fabric treatment apparatus
US3945225A (en) * 1973-05-25 1976-03-23 Mccoy Lyle E Continuous textile dyeing apparatus
US3995457A (en) * 1974-04-30 1976-12-07 Shigeru Kinomoto Continuous padding type dyeing machine
US4055971A (en) * 1976-08-10 1977-11-01 Martin Processing, Inc. Closed cycle apparatus for the rapid, continuous and waterless dyeing of textile and plastic materials
US5236580A (en) * 1991-07-08 1993-08-17 Kelleher Equipment Co., Inc. Device for reclaiming dry cleaning solvent from a dry cleaning machine
US5246501A (en) * 1990-12-07 1993-09-21 Alliedsignal Inc. Flash drying treatment of solvent from workpieces
US20080282575A1 (en) * 2005-04-13 2008-11-20 Lindauer Dornier Gesellschaft Mbh Multistage Continuous Dryer, Especially For Plate-Shaped Products
US20090038176A1 (en) * 2005-04-13 2009-02-12 Alfred Dotzler Multistage continuous dryer, especially for plate-shaped products

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1273546A (en) * 1968-06-25 1972-05-10 Ici Ltd Treatment of textile materials
US3800433A (en) * 1972-05-04 1974-04-02 H Kubodera Drying and curing apparatus
GB8729998D0 (en) * 1987-12-23 1988-02-03 British Replin Ltd Fabrics

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2115630A (en) * 1934-11-20 1938-04-26 Wacker Chemie Gmbh Process and apparatus for treating lengths of material
US2199233A (en) * 1939-11-24 1940-04-30 Gen Dyestuff Corp Method of dyeing fabric
US2571494A (en) * 1949-03-25 1951-10-16 Spooner William Wycliffe Apparatus for the treatment of textiles
FR1059530A (fr) * 1952-07-07 1954-03-25 Installation à fonctionnement continu pour l'extraction des corps gras à l'aide de solvant

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2115630A (en) * 1934-11-20 1938-04-26 Wacker Chemie Gmbh Process and apparatus for treating lengths of material
US2199233A (en) * 1939-11-24 1940-04-30 Gen Dyestuff Corp Method of dyeing fabric
US2571494A (en) * 1949-03-25 1951-10-16 Spooner William Wycliffe Apparatus for the treatment of textiles
FR1059530A (fr) * 1952-07-07 1954-03-25 Installation à fonctionnement continu pour l'extraction des corps gras à l'aide de solvant

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3770375A (en) * 1971-12-22 1973-11-06 Pavena Ag Working process for an impregnation liquid for continuous treatment of a textile fiber band
US3828587A (en) * 1972-04-03 1974-08-13 Riggs & Lombard Inc Fabric treatment apparatus
US3945225A (en) * 1973-05-25 1976-03-23 Mccoy Lyle E Continuous textile dyeing apparatus
US3995457A (en) * 1974-04-30 1976-12-07 Shigeru Kinomoto Continuous padding type dyeing machine
US4055971A (en) * 1976-08-10 1977-11-01 Martin Processing, Inc. Closed cycle apparatus for the rapid, continuous and waterless dyeing of textile and plastic materials
US5246501A (en) * 1990-12-07 1993-09-21 Alliedsignal Inc. Flash drying treatment of solvent from workpieces
US5236580A (en) * 1991-07-08 1993-08-17 Kelleher Equipment Co., Inc. Device for reclaiming dry cleaning solvent from a dry cleaning machine
US20080282575A1 (en) * 2005-04-13 2008-11-20 Lindauer Dornier Gesellschaft Mbh Multistage Continuous Dryer, Especially For Plate-Shaped Products
US20090038176A1 (en) * 2005-04-13 2009-02-12 Alfred Dotzler Multistage continuous dryer, especially for plate-shaped products
US7997003B2 (en) * 2005-04-13 2011-08-16 Lindauer Dornier Gesellschaft Mbh Multistage continuous dryer, especially for plate-shaped products

Also Published As

Publication number Publication date
GB1109686A (en) 1968-04-10
DE1469263B2 (de) 1975-06-05
BE664964A (es) 1965-10-01
ES313753A1 (es) 1966-06-16
NL6507107A (es) 1965-12-06
DE1469263A1 (de) 1968-12-12
FR1444332A (fr) 1966-07-01

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