CH154262A - Process for the production of seamless hollow bodies from plastic materials. - Google Patents

Process for the production of seamless hollow bodies from plastic materials.

Info

Publication number
CH154262A
CH154262A CH154262DA CH154262A CH 154262 A CH154262 A CH 154262A CH 154262D A CH154262D A CH 154262DA CH 154262 A CH154262 A CH 154262A
Authority
CH
Switzerland
Prior art keywords
molded body
plastic materials
hollow bodies
production
solution
Prior art date
Application number
Other languages
German (de)
Inventor
Vass Franz
Original Assignee
Vass Franz
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 Vass Franz filed Critical Vass Franz
Publication of CH154262A publication Critical patent/CH154262A/en

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00Moulds or cores; Details thereof or accessories therefor
    • B29C33/44Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles
    • B29C33/54Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles made of powdered or granular material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C41/00Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/02Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Moulding By Coating Moulds (AREA)

Description

  

  Verfahren     zur    Herstellung nahtloser     Rohlkörper    aus plastischen     Stoffen.       Gegenstand vorliegender Erfindung ist  ein Verfahren, um nahtlose Hohlkörper aus  plastischen Stoffen, wie zum Beispiel     Aze-          tylzellulose,    durch Aufbringen einer Lösung  auf einen Formkörper, Trocknen der am  Formkörper anhaftenden Lösung und Ent  fernen der durch Verdunsten des Lösungs  mittels entstandenen Haut vom Formkörper  herzustellen.  



  Bisher wurden solche Hohlkörper auf       rrichr    oder weniger starren Formen erzeugt.  Solche Verfahren haben den Nachteil, dass  man nur gewisse einfache Formen herstellen       kann.    Der grösste Mangel dieser Verfahren  liegt in der     Schwierigkeit,    den gebildeten       Hohlkörper    vom Formkörper zu entfernen,  wenn ein Hohlkörper mit engem Hals und  kleiner Öffnung erzeugt werden soll.  



  Diese Nachteile sollen durch das Verfah  ren gemäss vorliegender Erfindung dadurch  behoben werden, dass eine biegsame Hülle zur  Bildung des Formkörpers mit einem Stoff  aufgefüllt wird, der nach dem Entstehen des  Hohlkörpers aus der Hülle abgelassen wird,    vorauf letztere erschlafft und in schlaffem  Zustand vom Hohlkörper getrennt wird.  



  Dadurch kann man nun nicht nur die  bisher darstellbaren Hohlkörper herstellen,  sondern auch solche mit engem Hals     bezw.     mit Verengungen.  



  Das Aufbringen einer Lösung, zum Bei  spiel     Azet3llzelluloselösung,    auf den Form  körper kann durch Tauchen desselben in der  Lösung, oder durch Begiessen oder Bespritzen  desselben mit der Lösung vorgenommen wer  den.  



  Der Formkörper besteht aus einer bieg  samen,     auffüllbaren    Hülle und einem Füll  stoff, und zwar wird zum Aufbringen der  Lösung die Hülle zum Beispiel mit Flüssig  keit gefüllt oder mit einem Gas aufgeblasen.  Nach dem Erstarren der auf dem Formkör  per durch Verdunsten des Lösungsmittels  entstandenen Haut, kann der Füllstoff aus  der biegsamen Hülle abgelassen werden, wor  auf letztere schlaff wird und in diesem Zu  stand ohne Schwierigkeit aus dem Hohlkörper       entfernt    werden kann.

        Während des Tauch- und     Troeknungs-          vorganges    kann durch den Auftrieb der Lö  sung, durch das Gewicht des Tauchmaterials       bezw.    infolge Schrumpfung des Materials,  eine Deformation oder ein Umkippen des  Formkörpers eintreten, was durch ein in die  Hülle ein- und ausführbares Hilfsgestell,  zum Beispiel in Form eines zusammenklapp  baren Gerippes vermieden werden kann.  Dieses Hilfsgestell, welches nur in     gewissen     Fällen angewendet wird, bildet nicht einen  Teil des Formkörpers, sondern dient nur zur  Sicherung der Form des Formkörpers wäh  rend der Herstellung des Hohlkörpers.  



  Das beschriebene Verfahren bietet den  Vorteil, dass man nahtlose, auch enghalsige  Hohlkörper einfach und handlich herstellen  kann.



  Process for the production of seamless blanks from plastic materials. The present invention relates to a method to produce seamless hollow bodies from plastic materials, such as acetyl cellulose, by applying a solution to a shaped body, drying the solution adhering to the shaped body and removing the skin from the shaped body resulting from evaporation of the solution.



  So far, such hollow bodies have been produced on rrichr or less rigid forms. Such processes have the disadvantage that only certain simple shapes can be produced. The greatest deficiency of these processes is the difficulty of removing the hollow body formed from the molded body when a hollow body with a narrow neck and a small opening is to be produced.



  These disadvantages should be remedied by the procedural Ren according to the present invention in that a flexible shell to form the molded body is filled with a substance that is drained from the shell after the formation of the hollow body, before the latter slackens and separated from the hollow body in a slack state becomes.



  As a result, you can now not only produce the previously representable hollow bodies, but also those with a narrow neck or. with constrictions.



  A solution, for example acet3ll cellulose solution, can be applied to the molded body by dipping it in the solution or by pouring or spraying it with the solution.



  The shaped body consists of a flexible, fillable shell and a filler, namely the shell is filled with liquid, for example, or inflated with a gas to apply the solution. After the solidification of the skin formed on the Formkör by evaporation of the solvent, the filler can be drained from the flexible casing, whereupon the latter becomes limp and in this state can be removed from the hollow body without difficulty.

        During the immersion and drying process, the buoyancy of the solution, the weight of the immersion material or occur as a result of shrinkage of the material, deformation or overturning of the shaped body, which can be avoided by an auxiliary frame that can be inserted and executed in the shell, for example in the form of a collapsible framework. This auxiliary frame, which is only used in certain cases, does not form part of the molded body, but only serves to secure the shape of the molded body during the manufacture of the hollow body.



  The method described offers the advantage that seamless, even narrow-necked hollow bodies can be produced easily and easily.

 

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung nahtloser Hohlkörper aus plastischen Stoffen durch Aufbringen einer Lösung auf einen Form körper, Trocknen der am Formkörper anhaf tenden Lösung und Entfernen der durch Verdunsten des Lösungsmittels entstandenen Haut vom Formkörper, dadurch gekennzeich net, dass eine biegsame Hülle zur Bildung des Formkörpers mit einem Stoff aufgefüllt wird, der nach dem Entstehen des Hohlkör pers aus der Hülle abgelassen wird, worauf letztere erschlafft und in schlaffem Zustand vom Hohlkörper getrennt wird. UNTERANSPRUCH: Verfahren nach Patentanspruch, dadurch gekennzeichnet, dass zur Sicherung der Form des Formkörpers während der Herstellung des Hohlkörpers ein in die Hülle ein- und ausführbares Hilfsgestell in die Hülle ge bracht wird. PATENT CLAIM: Process for the production of seamless hollow bodies from plastic materials by applying a solution to a molded body, drying the solution adhering to the molded body and removing the skin from the molded body resulting from evaporation of the solvent, characterized in that a flexible shell to form the molded body is filled with a substance that is drained from the shell after the formation of the Hohlkör pers, whereupon the latter slackens and is separated from the hollow body in the slack state. SUBSTITUTE SHEET: The method according to claim, characterized in that to secure the shape of the molded body during the manufacture of the hollow body, an auxiliary frame that can be inserted into and removed from the sleeve is placed in the sleeve.
CH154262D 1931-06-26 1931-06-26 Process for the production of seamless hollow bodies from plastic materials. CH154262A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH154262T 1931-06-26

Publications (1)

Publication Number Publication Date
CH154262A true CH154262A (en) 1932-04-30

Family

ID=4408995

Family Applications (1)

Application Number Title Priority Date Filing Date
CH154262D CH154262A (en) 1931-06-26 1931-06-26 Process for the production of seamless hollow bodies from plastic materials.

Country Status (1)

Country Link
CH (1) CH154262A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE875267C (en) * 1939-10-01 1953-04-30 Jakob Dichter Process for the manufacture of hollow bodies from plastics by pouring the liquid mass onto a rotating core

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE875267C (en) * 1939-10-01 1953-04-30 Jakob Dichter Process for the manufacture of hollow bodies from plastics by pouring the liquid mass onto a rotating core

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