DE2064929A1 - Method and device for the manufacture of hollow bodies from thermoplastic material excretion from 2002914 - Google Patents
Method and device for the manufacture of hollow bodies from thermoplastic material excretion from 2002914Info
- Publication number
- DE2064929A1 DE2064929A1 DE19702064929 DE2064929A DE2064929A1 DE 2064929 A1 DE2064929 A1 DE 2064929A1 DE 19702064929 DE19702064929 DE 19702064929 DE 2064929 A DE2064929 A DE 2064929A DE 2064929 A1 DE2064929 A1 DE 2064929A1
- Authority
- DE
- Germany
- Prior art keywords
- thermoplastic material
- blow molding
- hollow bodies
- machines
- spray head
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims description 17
- 239000012815 thermoplastic material Substances 0.000 title claims description 12
- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 230000029142 excretion Effects 0.000 title 1
- 238000000071 blow moulding Methods 0.000 claims description 16
- 239000007921 spray Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 description 9
- 239000004033 plastic Substances 0.000 description 6
- 229920003023 plastic Polymers 0.000 description 6
- 239000002699 waste material Substances 0.000 description 6
- 239000008187 granular material Substances 0.000 description 2
- 229920000426 Microplastic Polymers 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C49/04—Extrusion blow-moulding
- B29C49/0411—Means for defining the wall or layer thickness
- B29C49/04112—Means for defining the wall or layer thickness for varying the thickness
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/0005—Direct recuperation and re-use of scrap material during moulding operation, i.e. feed-back of used material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/28—Blow-moulding apparatus
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/48—Moulds
- B29C49/50—Moulds having cutting or deflashing means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/72—Deflashing outside the mould
- B29C2049/725—Means for removing the deflashed parts from the deflashing area, e.g. burrs being removed from the deflashing area by a conveyor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/006—Blow-moulding plants, e.g. using several blow-moulding apparatuses cooperating
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Environmental & Geological Engineering (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Description
Verfahren und Vorrichtung zur Herstellung von Hohlkörpern aus thermoplastischem MaterialMethod and device for the production of Hollow bodies made of thermoplastic material
Die Erfindung bezieht sich auf ein Verfahren zur Herstellung von Hohlkörpern, insbesondere Flaschen, bei dem ein Stück eines aus einem Spritzkopf austretenden Schlauches aus thermoplastischem Material vom Spritzkopf abgetrennt und innerhalb einer zwei- oder mehrteiligen Form mit Druckluft aufgeweitet wird, und auf eine Vorrichtung zur Durchführung des Verfahrens.The invention relates to a method for producing hollow bodies, in particular bottles, in which a piece a hose made of thermoplastic material emerging from a spray head is separated from the spray head and is expanded within a two-part or multi-part mold with compressed air, and on a device for implementation of the procedure.
Es ist bereits ein Verfahren zur Herstellung von Hohlkörpern in Blasformen bekannt, bei dem Kunststoff in einem Schneckenextruder plastifiziert wird. Von einem Extruderkopf dieses Schneckenexfcruders führen Leitungen zu einer Anzahl von Blasformvorrichtungen, in denen die gewünschten Hohlkörper hergestellt werden sollen. Die StrÖmungsv/ege des plastifiziert en Materials vom Schneckenextruder zu den einzelnen Blasform-A method for producing hollow bodies in blow molds is already known, in which the plastic is used in a screw extruder is plasticized. Lines lead from an extruder head of this screw extruder to a number of blow molding devices, in which the desired hollow bodies are to be produced. The flow paths of the plasticized Material from the screw extruder to the individual blow molding
109834/1462109834/1462
Vorrichtungen sind relativ lang. Auf diesem Weg kühlt sich das plastifizierte Material entweder ungünstig ab und kann nicht mehr zufriedenstellend verformt werden oder es muß anfangs im Schneckenextruder so stark überhitzt werden, daß eine Verschlechterung der Materialeigenschaften eintritt. Kit diesem bekannten Verfahren gelangt man daher nicht zu einer wirtschaftlichen Produktion von in ihren Eigenschaften zufriedenstellenden Kunststoffkörpern.Devices are relatively long. This cools you down the plasticized material is either unfavorable and can no longer be deformed satisfactorily or it must initially overheat so much in the screw extruder that a deterioration in the material properties entry. Kit of this known method therefore does not lead to an economical production of plastic bodies which are satisfactory in terms of their properties.
P Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren der eingangs erläuterten Art und eine Vorrichtung zur Durchführung des Verfahrens zu schaffen, welche einfach und wirtschaftlich sind und eine hohe Produktionskapazität aufweisen und die Herstellung von Kunststoffhohlkörpern mit zufriedenstellenden Eigenschaften gewährleisten.The invention is based on the object of a method of the type explained at the outset and a device for Implementation of the process to create which are simple and economical and a high production capacity have and the production of plastic hollow bodies with satisfactory properties.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß mehrere Blasmaschinen verwendet werden und daß alle Maschinen von einer gemeinsamen Einrichtung zur Speisung des thermoplastischen Materials versorgt werden.This object is achieved according to the invention in that several blow molding machines are used and that all machines are supplied by a common device for feeding the thermoplastic material.
* Bei dem erfindungsgemäßen Verfahren wird das Kunststoffmaterial jeweils erst in einer der verwendeten Blasmaschinen plastifiziert und bereits am Ausgang der Blasmaschine in einer Blasform zu einem Hohlkörper verarbeitet. Dadurch ergeben sich für das plastifizierte Material äußerst kurze Strömungswege, so daß das Material, um bis zu den Blasdüsen hin ausreichend flüssig zu bleiben, nicht überhitzt werden muß. Bei dem erfindungsgemäßen Verfahren erfolgt die Zufuhr des Kunatstoffmaterials, insbesondere Kunststoffgranulate zu den einzelnen Blasmaschinen mittels einer gemeinsamen Einrichtung. Das* In the method according to the invention, the plastic material each plasticized only in one of the blow molding machines used and already at the exit of the blow molding machine processed in a blow mold to form a hollow body. This results in extremely short flow paths for the plasticized material, so that the material to to remain sufficiently fluid up to the air nozzles, does not have to be overheated. In the method according to the invention, the plastic material is supplied, in particular plastic granulates for the individual blow molding machines by means of a common facility. That
10983A/U8210983A / U82
Kunststoffgranulat kann dann in Granulatform den einzelnen Blasmaschinen zugeführt und erst dort plastifiziert werden. Das erfindurigsgeraäße Yerfahren ist einfach und wirtschaftlich und im Betrieb sehr zuverlässig.Plastic granules can then be given to the individual in granule form Blow molding machines are fed and only then plasticized. The inventive method is simple and economical and very reliable in operation.
Eine Vorrichtung zur Durchführung des erfindungsgemäßen Verfahrens ist mit Vorteil so ausgebildet, daß alle nebeneinanderstehenden Blasmaschinen von einer gemeinsamen Vorrichtung zur Einspeisung des thermoplastischen Materials versorgt werden.A device for carrying out the method according to the invention is advantageously designed so that all standing next to one another Blow molding machines from a common device for feeding in the thermoplastic material are supplied.
Weitere Vorteile und Einzelheiten der Erfindung sollen anhand von den in den Fig. 1 und 2 dargestellten Ausführungs~ beispielen erläutert werden. Es zeigenFurther advantages and details of the invention will be based on the embodiment shown in FIGS. 1 and 2 ~ examples are explained. Show it
Fig. 1 schematisch eine Flaschenblasmaschine zur Durchführung des erfindmtgsgemäßen Verfahrens,Fig. 1 schematically shows a bottle blowing machine for implementation of the inventive method,
Fig. 2 perspektivisch eine Anlage mit vier Blasmaschmen und einer gemeinsamen Einspeisungsvorrichtung.Fig. 2 is a perspective view of a system with four Blasmaschmen and a common feeding device.
In Fig. 1 ist schematisch eine Anlage zur Durchführung des erfindungsgemäßen Verfahrens dargestellt, in der aus Übersichtlichkeit sgründen nur eine Schneckenpresse 5 angedeutet ist, der von einem Mischer 3 &er Material zugeführt wird. Die in Fig. 1 dargestellte Blasmaschine wird von einem Behälter 1 mit thermoplastischem Material versorgt. Dieses Material gelangt über die Leitung 2 in den Mischer 3? dem auch der in der Mühle 4- zerkleinerte Abfall zugeführt wird. Vom Mischer 3 gelangt das thermoplastische Material in die Schneckenpresse 5, aus dessen Spritzkopf der Schlauch 6 austritt.In Fig. 1, a system for performing the method according to the invention is shown schematically in which, for reasons of clarity, only one screw press 5 is indicated, which is supplied by a mixer 3 & er material. The blow molding machine shown in Fig. 1 is supplied from a container 1 with thermoplastic material. This material reaches the mixer 3 via line 2 ? which is also fed to the waste crushed in the mill 4. The thermoplastic material passes from the mixer 3 into the screw press 5, from the injection head of which the hose 6 emerges.
1Q9834/U621Q9834 / U62
Innerhalb der Form 8 wird ein Stück des Schlauches 6 nach dem Schließen der Form 8 aufgeblasen und nach dem Öffnen der Form 8 mit Hilfe des Auswerfers 7 aus der Form ent-" fernt. Die Horizontalbewegungen der Form werden durch die pneumatisch betätigbare Zylinder-Kolben-Anordnung 9 und die Vertikalbewegungen durch die pneumatisch betätigbare Zylinder-Kolben-Anordnung 10 bewirkt. Beide Einrichtungen und 10 werden vom Kompressor 11 versorgt. Die fertigen Hohlkörper und der Abfall werden vom Band 12 an die geft wünschten Stellen befördert. Die Steuerung der Anlage erfolgt durch die im Schrank 13 untergebrachten Schalteinrichtungen. Inside the mold 8, a piece of the tube 6 is inflated after the mold 8 is closed and after it is opened the mold 8 with the help of the ejector 7 from the mold. far away. The horizontal movements of the mold are controlled by the pneumatically operated cylinder-piston arrangement 9 and the vertical movements caused by the pneumatically actuated cylinder-piston arrangement 10. Both bodies and 10 are supplied by the compressor 11. The finished hollow bodies and the waste are attached to the belt 12 desired positions promoted. The system is controlled by the switching devices housed in the cabinet 13.
Die Fig. 2 zeigt eine Anlage zur Durchführung des erfindungsgemäßen Verfahrens, bei der vier Blasmaschinen nebeneinander vorgesehen sind. Die Blasmaschinen besitzen eine geometrische äußere Form, so daß sie ohne weiteres in raumsparender Weise nebeneinander aufgestellt werden können. Die Einrichtung zur Versorgung der Maschinen mit thermoplastischem Material, bestehend aus dem Behälter 1 und dem Mischer 3» ist für alle Maschinen gemeinsam vorgesehen. Zu dieser Produktionseinheit gehören auch noch die Schaltschränke 13, die einen ™ synchronen Ablauf der Flaschenproduktion gewährleisten. Die produzierten Flaschen und der Abfall fallen auf dasFörderband 21« Am Ende des Förderbandes 21 gelangen die Flaschen in die pneumatische Transportvorrichtung 22, die die Flaschen zur Abfülleinrichtung 23 fördert. Der Abfall wird vom Band 24 in die Abfallmühle 25 gefördert. Der darin zerkleinerte Abfall wird über die Leitung Ü6 dem Mischer zurückgeführt. Die Flaschen können nach der Füllung in ,nicht dargestellten Einrichtungen etikettiert, verpackt und von dort aus sr,·B, direkt auf Lkw1s verladen werden·FIG. 2 shows a system for carrying out the method according to the invention, in which four blow molding machines are provided next to one another. The blow molding machines have a geometrical outer shape so that they can easily be set up next to one another in a space-saving manner. The device for supplying the machines with thermoplastic material, consisting of the container 1 and the mixer 3 », is provided for all machines in common. This production unit also includes the control cabinets 13, which ensure a synchronous flow of bottle production. The bottles produced and the waste fall onto the conveyor belt 21 '. At the end of the conveyor belt 21, the bottles pass into the pneumatic transport device 22, which conveys the bottles to the filling device 23. The waste is conveyed from the belt 24 into the waste mill 25. The shredded waste is returned to the mixer via line U6. After filling, the bottles can be labeled and packaged in equipment (not shown) and from there sr, B, loaded directly onto a truck for 1 s
1098 3 Wj 146 21098 3 Wj 146 2
ORIGINAL INSPECTEDORIGINAL INSPECTED
Die Erfindung ist nicht auf die in den Pig. 1 und 2 dargestellten Ausführungsbeiepiele beschränkt. Ihre Anwendung ist auch bei anderen Blasanlagen vorteilhaft. Das erfindungsgemäße Verfahren kann sowohl bei einfachen Blasmaschinen mit kleiner Leistung und diskontinuierlicher Arbeitsweise als auch bei großen Maschinen mit hohen Leistungen und kontinuierlicher Arbeitsweise angewendet werden.The invention is not based on the Pig. 1 and 2 shown exemplary embodiments. Your application is also advantageous for other blow molding systems. The inventive method can be used both with simple Blow molding machines with low power and discontinuous operation as well as large machines with high Performances and continuous working methods are applied.
ORIGINAL JNSPSDTEÖORIGINAL JNSPSDTEÖ
109834/U62109834 / U62
Claims (2)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR6910372A FR2029992A5 (en) | 1969-04-04 | 1969-04-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE2064929A1 true DE2064929A1 (en) | 1971-08-19 |
Family
ID=9031921
Family Applications (5)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19702064928 Pending DE2064928A1 (en) | 1969-04-04 | 1970-01-23 | Method and device for the production of hollow bodies from thermoplastic material. Eliminated from 2002914 |
| DE19702064929 Pending DE2064929A1 (en) | 1969-04-04 | 1970-01-23 | Method and device for the manufacture of hollow bodies from thermoplastic material excretion from 2002914 |
| DE19702064930 Pending DE2064930A1 (en) | 1969-04-04 | 1970-01-23 | Device for the production of hollow bodies from thermoplastic material precipitation from 2002914 |
| DE19702002914 Pending DE2002914A1 (en) | 1969-04-04 | 1970-01-23 | Method and device for the production of hollow bodies from thermoplastic material |
| DE19702064931 Pending DE2064931A1 (en) | 1969-04-04 | 1970-01-23 | Method and device for the manufacture of hollow bodies excretion from 2002914 |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19702064928 Pending DE2064928A1 (en) | 1969-04-04 | 1970-01-23 | Method and device for the production of hollow bodies from thermoplastic material. Eliminated from 2002914 |
Family Applications After (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19702064930 Pending DE2064930A1 (en) | 1969-04-04 | 1970-01-23 | Device for the production of hollow bodies from thermoplastic material precipitation from 2002914 |
| DE19702002914 Pending DE2002914A1 (en) | 1969-04-04 | 1970-01-23 | Method and device for the production of hollow bodies from thermoplastic material |
| DE19702064931 Pending DE2064931A1 (en) | 1969-04-04 | 1970-01-23 | Method and device for the manufacture of hollow bodies excretion from 2002914 |
Country Status (11)
| Country | Link |
|---|---|
| AT (1) | AT322831B (en) |
| BE (1) | BE746422A (en) |
| BR (1) | BR7017313D0 (en) |
| CA (1) | CA945319A (en) |
| CH (1) | CH504950A (en) |
| CS (1) | CS161108B2 (en) |
| DE (5) | DE2064928A1 (en) |
| ES (1) | ES378263A1 (en) |
| FR (1) | FR2029992A5 (en) |
| GB (1) | GB1270853A (en) |
| NL (1) | NL7002263A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2255276A1 (en) * | 1972-11-11 | 1974-05-22 | Stefan Fischer | METHOD AND DEVICE FOR MANUFACTURING HOLLOW BODIES FROM WARMFORMABLE PLASTIC |
| FR2764231B1 (en) * | 1997-06-05 | 1999-08-27 | Batmag Sa | BLOW MOLDING METHOD AND DEVICE |
| IT1299973B1 (en) * | 1998-04-16 | 2000-04-04 | Techne Technipack Engineering | AUTOMATIC MACHINE FOR THE PRODUCTION, FOR THE CONTROL, FOR THE FILLING AND CAPPING OF THERMOPLASTIC BOTTLES. |
| CN104070617A (en) * | 2013-03-26 | 2014-10-01 | 防城港市港口区宏达塑料厂 | BOPA production marginal material recovery system |
| CN114986852B (en) * | 2022-06-01 | 2024-02-20 | 安徽万有新材料有限公司 | Plastic bottle's production processingequipment |
| CN118993504B (en) * | 2024-08-29 | 2025-03-07 | 扬州市五域光电科技有限公司 | Blow molding equipment and method for glass product |
-
1969
- 1969-04-04 FR FR6910372A patent/FR2029992A5/fr not_active Expired
- 1969-06-05 GB GB2838769A patent/GB1270853A/en not_active Expired
- 1969-06-27 CH CH1001769A patent/CH504950A/en not_active IP Right Cessation
-
1970
- 1970-01-23 DE DE19702064928 patent/DE2064928A1/en active Pending
- 1970-01-23 DE DE19702064929 patent/DE2064929A1/en active Pending
- 1970-01-23 DE DE19702064930 patent/DE2064930A1/en active Pending
- 1970-01-23 AT AT64070A patent/AT322831B/en not_active IP Right Cessation
- 1970-01-23 DE DE19702002914 patent/DE2002914A1/en active Pending
- 1970-01-23 DE DE19702064931 patent/DE2064931A1/en active Pending
- 1970-02-18 NL NL7002263A patent/NL7002263A/xx unknown
- 1970-02-24 BE BE746422D patent/BE746422A/en unknown
- 1970-03-03 BR BR21731370A patent/BR7017313D0/en unknown
- 1970-03-11 CA CA077,136A patent/CA945319A/en not_active Expired
- 1970-04-03 CS CS219970A patent/CS161108B2/cs unknown
- 1970-04-04 ES ES378263A patent/ES378263A1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| BR7017313D0 (en) | 1973-04-17 |
| FR2029992A5 (en) | 1970-10-23 |
| DE2002914A1 (en) | 1970-10-15 |
| BE746422A (en) | 1970-07-31 |
| CA945319A (en) | 1974-04-16 |
| GB1270853A (en) | 1972-04-19 |
| DE2064930A1 (en) | 1971-08-05 |
| CH504950A (en) | 1971-03-31 |
| DE2064928A1 (en) | 1971-09-09 |
| NL7002263A (en) | 1970-10-06 |
| DE2064931A1 (en) | 1971-08-19 |
| AT322831B (en) | 1975-06-10 |
| CS161108B2 (en) | 1975-05-04 |
| ES378263A1 (en) | 1972-05-16 |
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