DE417653C - Verfahren zur Herstellung hohler Gummigegenstaende - Google Patents

Verfahren zur Herstellung hohler Gummigegenstaende

Info

Publication number
DE417653C
DE417653C DEP40220D DEP0040220D DE417653C DE 417653 C DE417653 C DE 417653C DE P40220 D DEP40220 D DE P40220D DE P0040220 D DEP0040220 D DE P0040220D DE 417653 C DE417653 C DE 417653C
Authority
DE
Germany
Prior art keywords
rubber
edges
cutting edges
mold
cavity
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
DEP40220D
Other languages
English (en)
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.)
PARAMOUNT RUBBER CONS Inc
Original Assignee
PARAMOUNT RUBBER CONS Inc
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
Application filed by PARAMOUNT RUBBER CONS Inc filed Critical PARAMOUNT RUBBER CONS Inc
Application granted granted Critical
Publication of DE417653C publication Critical patent/DE417653C/de
Expired legal-status Critical Current

Links

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
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/26—Component parts, details or accessories; Auxiliary operations
    • B29C51/266—Auxiliary operations after the thermoforming operation
    • B29C51/267—Two sheets being thermoformed in separate mould parts and joined together while still in the mould
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/74—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
    • B29C65/743—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc
    • B29C65/7441—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc for making welds and cuts of other than simple rectilinear form
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
    • B29C65/7841—Holding or clamping means for handling purposes
    • B29C65/7847—Holding or clamping means for handling purposes using vacuum to hold at least one of the parts to be joined
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
    • B29C66/133—Fin-type joints, the parts to be joined being flexible
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/432—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms
    • B29C66/4322—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms by joining a single sheet to itself
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81427—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/824—Actuating mechanisms
    • B29C66/8242—Pneumatic or hydraulic drives
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D22/00—Producing hollow articles
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81415—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled
    • B29C66/81417—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled being V-shaped
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2021/00—Use of unspecified rubbers as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2022/00—Hollow articles
    • B29L2022/02—Inflatable articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2022/00—Hollow articles
    • B29L2022/02—Inflatable articles
    • B29L2022/022—Balloons

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)

Description

  • Verfahren zur Herstellung hohler Gummigegenstände. Gegenstand der Erfindung ist ein Verfahren zur Herstellung hohler Gummigegenstände aus zwei an ihren Rändern zusammengepreßten unvulkanisierten Scheiben. Es ist bereits bekannt, zu diesem Zweck die Gummischeiben auf Formenhälften aufzulegen und durch Saugluft in die Formhöhlungen hineinzuziehen. Hierbei ergeben sich aber, da je nach der Menge des überstehenden Randes die Gummiplatten mehr oder weniger gedehnt werden, ungleichmäßige Gummistärken. Schneidet man die Gummischeiben vorher in runde Formen, um sie dann in die Höhlungen einzusaugen, so entstehen, da die runden Gummistücke am Rande nicht festgehalten werden, leicht Falten. Auch haben diese Verfahren den Nachteil, daß zwei Arbeitsgänge erforderlich sind, nämlich. ein Schneiden der Platten und nach .dem Einsaugen in die Formhöhlungen ein Auseinanderdrücken der Kanten.
  • Die vorliegende Erfindung beseitigt nun diesen übelstand dadurch, daß jede Gummischeibe auf eine Formhälfte gelegt wird, deren Höhlung von Schneidkanten umgeben ist. Durch Verminderung des Luftdruckes in der Formhöhlung wird dann nur der innerhalb der Schneidkanten liegende Teil der Scheibe in die Höhlung gezogen, da die Schneidkanten die weiche urvulkanisierte Gummischeibe festhalten. Es bildet sich infolgedessen ein Gummikörper von außerordentlich gleichmäßiger Stärke ohne jede Faltenbildung. Man kann alsdann durch eine einmalige Gegeneinanderbewegung der beiden Formhälften mittels der Schneidkanten die von ihnen festgehaltenen Ränder der Seheibe zusammenpressen und gleichzeitig die überschüssigen Gummiteile abtrennen.
  • Die Zeichnung zeigt als Beispiel eine Ausführungsform einer Vorrichtung zur Ausführung des Verfahrens gemäß der Erfindung.
  • Die Vorrichtung besteht aus den beiden Formteilen 40 und 41, die in bekannter Weise mittels Schrauben o. dgl. an den Platten der Presse befestigt werden. Die Höhlungen der beiden Formteile stehen durch Bohrungen 44 mit Leitungen in Verbindung, mit denen Hilfe die Formhöhlungen in Verbindung mit der äußeren Luft gebracht werden können. Man bringt die Form in einen Raum, in welchem Überdruck vorhanden ist, so daß, wenn eine Gummischicht A,1 über die Hohlräume der Formen gelegt und dann diese Form mit der äußeren Luft in Verbindung gesetzt wird, der überdruck den Gummi in die Höhlung eindrückt. Am besten wird der ganze Raum, in welchem die Presse steht, mit Druckluft versehen, so daß auch der die Presse bedienende Arbeiter sich in diesem unter Druck stehenden Raum befindet. Der Raum muß dann durch einen luftdichten Verschluß abgeschlossen sein, der auch das Aus- und Eingehen ermöglicht, ohne den Luftüberdruck wesentlich herabzusetzen.
  • Natürlich kann auch, wenn die Presse " in einem Raum von atmosphärischer Spannung steht, an die Bohrungen 44 eine Saugleitung angeschlossen werden.
  • Die Formteile besitzen rings um ihre Höhlungen herumlaufende Rippen 47, welche mit Schneidkanten versehen sind, auf die die Gummischichten aufgelegt werden.
  • Erfolgt nach dem Auflegen der Gummischichten auf die Formplatten das Einsaugen in die Formhöhlungen, so wird nur der innerhalb der Schneidkanten liegende Teil der Scheiben in die Höhlung hineingezogen, da die Schneidkanten die Gummiplatten halten. Werden nach. dem Einsaugen der Platten in die Formhöhlungen die beiden Formhälften gegeneinanderbewegt, so pressen die Schneidkanten infolge ihrer Abschrä.gung die beiden zusammenzufügenden Teile des herzustellenden Gegenstandes an der Schnittfuge zusammen, so daß an dieser Stelle ein Saum ai entsteht, der später beim Vulkanisieren beseitigt wird. Der überschüssige Teil des Gummis wird gleichzeitig durch die Schneidkanten abgetrennt, und er gelangt in den die Sc'hneidkanten umgebenden Raum, aus dem er später entnommen werden kann. Die so hergestellten Gegenstände können dann in: bekannter Weise vulkanisiert werden.

Claims (1)

  1. PATENTANSPRUCH. Verfahren zur Herstellung hohler Gummigegenstände aus zwei an ihnen Rändern zusammengepreßten unvulkanislerten Scheiben, gekennzeichnet durch folgende Maßnahmen: Jede Gummischeibe wird auf eine Formhälfte, deren Höhlung von Schneidkanteti umgeben ist, gelegt; durch Verminderung des Luftdruckes in der Formhöhlung wird der innerhalb der Schneidkanten liegende Teil der Scheiben in die Höhlung gezogen; hiernach werden die Formhäften derart gegeneinanderbewegt, daß ihre Schneidkanten die von ihnen festgehaltenen Ränder der Scheiben zusammenpressen und gleichzeitig die überschüssigen Gummiteile abtrennen.
DEP40220D 1916-10-14 1920-07-07 Verfahren zur Herstellung hohler Gummigegenstaende Expired DE417653C (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US145041XA 1916-10-14 1916-10-14

Publications (1)

Publication Number Publication Date
DE417653C true DE417653C (de) 1925-08-17

Family

ID=27732093

Family Applications (1)

Application Number Title Priority Date Filing Date
DEP40220D Expired DE417653C (de) 1916-10-14 1920-07-07 Verfahren zur Herstellung hohler Gummigegenstaende

Country Status (3)

Country Link
DE (1) DE417653C (de)
FR (1) FR517663A (de)
GB (1) GB145041A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE976813C (de) * 1941-02-12 1964-05-06 Plax Ges Mit Beschraenkter Haf Verfahren zur Herstellung hohler Gegenstaende aus organischem, thermoplastischem Kunststoff
DE1264755B (de) * 1963-09-26 1968-03-28 Max Weidner Vorrichtung zum Herstellen von Vorformlingen fuer hohle Gegenstaende

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4028042A (en) * 1973-08-14 1977-06-07 Dunlop Limited Moulding apparatus
GB2123740B (en) * 1982-07-03 1985-12-24 Bipel Ltd Improvements in and relating to moulding machines

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE976813C (de) * 1941-02-12 1964-05-06 Plax Ges Mit Beschraenkter Haf Verfahren zur Herstellung hohler Gegenstaende aus organischem, thermoplastischem Kunststoff
DE1264755B (de) * 1963-09-26 1968-03-28 Max Weidner Vorrichtung zum Herstellen von Vorformlingen fuer hohle Gegenstaende

Also Published As

Publication number Publication date
FR517663A (fr) 1921-05-10
GB145041A (en) 1921-12-14

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