CH372159A - Hollow body made of thermoplastic material and process for its manufacture - Google Patents

Hollow body made of thermoplastic material and process for its manufacture

Info

Publication number
CH372159A
CH372159A CH7019159A CH7019159A CH372159A CH 372159 A CH372159 A CH 372159A CH 7019159 A CH7019159 A CH 7019159A CH 7019159 A CH7019159 A CH 7019159A CH 372159 A CH372159 A CH 372159A
Authority
CH
Switzerland
Prior art keywords
mold
thermoplastic material
hollow bodies
wall
closed
Prior art date
Application number
CH7019159A
Other languages
German (de)
Inventor
Wilhelm Dr Wehr
Original Assignee
Degussa
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 Degussa filed Critical Degussa
Publication of CH372159A publication Critical patent/CH372159A/en

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
    • 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
    • B29C49/46—Component parts, details or accessories; Auxiliary operations characterised by using particular environment or blow fluids other than air
    • 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
    • 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
    • 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
    • B29C49/64—Heating or cooling preforms, parisons or blown 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
    • 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
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/6409—Thermal conditioning of preforms
    • B29C49/6463—Thermal conditioning of preforms by contact heating or cooling, e.g. mandrels or cores specially adapted for heating or cooling preforms
    • B29C49/6464—Heating
    • 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
    • B29C49/46—Component parts, details or accessories; Auxiliary operations characterised by using particular environment or blow fluids other than air
    • B29C2049/4602—Blowing fluids
    • B29C2049/4644—Blowing fluids created by evaporating material, e.g. solid powder
    • 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
    • B29C49/4823—Moulds with incorporated heating or cooling means
    • B29C2049/4825—Moulds with incorporated heating or cooling means for cooling moulds or mould parts
    • 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
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
    • B29C35/049—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using steam or damp

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Moulding By Coating Moulds (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

Description

  

  
 



  Aus thermoplastischem Kunststoff bestehender Hohlkörper und Verfahren zu seiner Herstellung
Es ist bekannt, zur Herstellung von Hohlkörpern aus thermoplastischem Kunststoff einen Schlauch aus diesem Stoff im plastischen Zustand in eine Form einzuziehen, zu verschliessen und ihn schliesslich gegen die Innenwand der Form aufzublasen. Hierbei ist es üblich, den Schlauch entweder im leicht aufgeblasenen Zustand in die Form einzuführen oder erst nach dem völligen Schliessen der mehrteiligen Form mit dem Aufblasen zu beginnen. Nach diesem Verfahren ist es im allgemeinen nicht möglich, solche Hohlkörper herzustellen, die im Verhältnis zu ihrem grossen Inhalt nur eine geringe Wandstärke aufweisen sollen, wie dies besonders bei solchen Hohlkörpern erwünscht ist, die als Einsatzbehälter verwendet werden sollen.



   Die vorliegende Erfindung betrifft nun einen aus thermoplastischem Kunststoff bestehenden Hohlkörper von mehr als 2 Litern Inhalt, der durch eine Wandstärke von 0,05 bis 2 mm gekennzeichnet ist.



   Der thermoplastische Kunststoff kann Farbstoffe, Pigmente, Weichmacher, Stabilisatoren, Gleitmittel und dergleichen enthalten.



   Die Erfindung betrifft ferner ein Verfahren zur Herstellung solcher Hohlkörper aus   thermoplastischem    Kunststoff, der in Form eines an einem Ende verschlossenen Schlauches in eine Form eingeführt und in plastischem Zustand durch   Über- oder    Unterdruck an die Formwandungen angepresst wird. Das Verfahren ist erfindungsgemäss dadurch gekennzeichnet, dass das eine Ende eines Schlauches aus thermoplastischem Kunststoff in durch Wärmeeinwirkung plastifiziertem Zustand durch mittiges Zusammenraffen oder durch eine nach aussen gewölbte Naht verschlossen und nach Einführen in eine einteilige, abschliessbare Form, dort durch Aufblasen von innen oder Ansaugen von aussen in die Endform gebracht wird. Nach dem Aufblasen wird der Hohlkörper aus der Form herausgenommen. Durch dieses Verfahren lassen sich Hohlkörper von z.

   B. 100 Liter Inhalt herstellen.



   Insbesondere bei der Verwendung grosser, relativ viel Wärme   verbrauchender    Formen ist das Aufblasen mit erhitzten, formgebenden Medien, z. B.



  Dampf, Flüssigkeiten usw., vorteilhaft. Gegebenenfalls muss bei dieser Variante vor dem Herausnehmen des Hohlkörpers aus der Form diese gekühlt werden.



   Auch das Anpressen des Kunststoffes an die Wände der Form mit zweckmässigerweise erhitzten Flüssigkeiten ist bei der Durchführung des erfin  dungsgemässen    Verfahrens möglich. Das Verschliessen des betreffenden Schlauchendes durch mittiges Zusammenraffen wird zweckmässig durch anschliessendes Verschweissen vervollständigt.



   Als Folge der nach aussen gewölbten Naht bzw. des zusammenraffenden Verschlusses des betreffenden Endes des plastifizierten schlauchförmigen Gebildes vor dem Einführen in die Form wird erreicht, dass sich der Kunststoff überall glatt an die Innenwand der Form anlegt. Hervorstehende Enden und Taschenbildung treten an keiner Stelle auf. Dadurch ist es möglich, bei dem erfindungsgemässen Verfahren einteilige Formen zu verwenden, was besonders bei der Herstellung von Hohlkörpern, die über die bisher allgemein gebräuchliche Grösse von 2 Litern Inhalt hinausgehen, vorteilhaft ist. Es können beispielsweise Hohlkörper von 100 Litern Inhalt ohne Schwierigkeiten hergestellt werden.



   Beim erfindungsgemässen Verfahren können sowohl kalte als auch warme Formen verwendet werden. Aus wirtschaftlichen Gründen sind jedoch kalte Formen zu bevorzugen.  



   Für das Verfahren geeignet sind alle thermoplastischen Kunststoffe, wie Polyvinylchlorid, Polyamide und insbesondere Polyolefine, z. B. Polyäthylen.



   Es ist vorteilhaft, den Kunststoffschlauch mit Hilfe einer Schneckenspritzmaschine herzustellen.



   Die erfindungsgemässen Hohlkörper können als Verpackungsmaterial, als   Innenauskleidung    oder vorzugsweise als auswechselbare Einsatzbehälter für aus Metall, Holz oder anderen Stoffen bestehende Gefässe verwendet werden.   



  
 



  Hollow body made of thermoplastic material and process for its manufacture
It is known, for the production of hollow bodies made of thermoplastic material, to draw a tube made of this material in the plastic state into a mold, to close it and finally to inflate it against the inner wall of the mold. It is customary here either to introduce the tube into the mold in the slightly inflated state or to begin inflating only after the multi-part mold has been completely closed. According to this process, it is generally not possible to produce such hollow bodies which should have only a small wall thickness in relation to their large content, as is particularly desirable for hollow bodies which are to be used as insert containers.



   The present invention relates to a hollow body made of thermoplastic material and having a capacity of more than 2 liters, which is characterized by a wall thickness of 0.05 to 2 mm.



   The thermoplastic can contain dyes, pigments, plasticizers, stabilizers, lubricants and the like.



   The invention also relates to a method for producing such hollow bodies from thermoplastic material, which is introduced into a mold in the form of a tube closed at one end and pressed against the mold walls in a plastic state by overpressure or underpressure. According to the invention, the method is characterized in that one end of a hose made of thermoplastic material in the state plasticized by the action of heat is closed by central gathering or by an outwardly curved seam and, after being inserted into a one-piece, lockable mold, there by inflating from the inside or sucking in is brought into the final shape on the outside. After inflation, the hollow body is removed from the mold. By this method, hollow bodies of z.

   B. produce 100 liters content.



   In particular when using large molds that consume a lot of heat, inflation with heated, shaping media, e.g. B.



  Steam, liquids, etc. are advantageous. If necessary, in this variant, the hollow body must be cooled before it is removed from the mold.



   It is also possible to press the plastic against the walls of the mold with expediently heated liquids when carrying out the method according to the invention. The closure of the hose end in question by centering it together is expediently completed by subsequent welding.



   As a result of the outwardly curved seam or the gathering closure of the relevant end of the plasticized tubular structure before it is introduced into the mold, it is achieved that the plastic lies smoothly everywhere on the inner wall of the mold. There are no protruding ends or pockets at any point. This makes it possible to use one-piece molds in the method according to the invention, which is particularly advantageous in the production of hollow bodies which exceed the previously generally used size of 2 liters. For example, hollow bodies with a capacity of 100 liters can be produced without difficulty.



   Both cold and warm molds can be used in the method according to the invention. For economic reasons, however, cold forms are preferred.



   All thermoplastics such as polyvinyl chloride, polyamides and especially polyolefins, e.g. B. polyethylene.



   It is advantageous to manufacture the plastic hose with the aid of a screw injection molding machine.



   The hollow bodies according to the invention can be used as packaging material, as inner lining or preferably as replaceable insert containers for vessels made of metal, wood or other materials.

Claims (1)

PATENTANSPRÜCHE I. Aus thermoplastischem Kunststoff bestehender Hohlkörper von mehr als 2 Litern Inhalt, gekennzeichnet durch eine Wandstärke von 0,05 bis 2 5nm. PATENT CLAIMS I. Hollow bodies made of thermoplastic material with a volume of more than 2 liters, characterized by a wall thickness of 0.05 to 2.5 nm. II. Verfahren zur Herstellung von Hohlkörpern nach Patentanspruch I aus thermoplastischem Kunststoff, der in Form eines an einem Ende verschlossenen Schlauches in eine Form eingeführt und in plastischem Zustand durch Über- oder Unterdruck an die Formwandungen angepresst wird, dadurch gekennzeichnet, dass das eine Ende eines Schlauches aus thermoplastischem Kunststoff in durch Wärmeeinwirkung plastifiziertem Zustand durch mittiges Zusammen- raffen oder durch eine nach aussen gewölbte Naht versohlossen und nach Einführen in eine einteilige, abschliessbare Form, dort durch Aufblasen von innen oder Ansaugen von aussen in die Endform gebracht wird. II. A method for producing hollow bodies according to claim I from thermoplastic material, which is introduced into a mold in the form of a tube closed at one end and pressed against the mold walls in a plastic state by overpressure or underpressure, characterized in that one end of a The tube made of thermoplastic material in the state plasticized by the action of heat is closed by central gathering or by an outwardly curved seam and, after being inserted into a one-piece, lockable form, is brought into the final shape by inflating from the inside or suction from the outside. UNTERANSPRÜCHE 1. Verfahren nach Patentanspruch II, dadurch gekennzeichnet, dass das Anpressen an die Innenwand der Form durch Aufblasen des einseitig verschlossenen Schlauches mit einem erhitzten Medium, wie Heissluft, Heissdampf oder erhitzter Flüssigkeit erfolgt. SUBCLAIMS 1. The method according to claim II, characterized in that the pressing against the inner wall of the mold is carried out by inflating the tube closed on one side with a heated medium such as hot air, superheated steam or heated liquid. 2. Verfahren nach Patentanspruch II, dadurch gekennzeichnet, dass das Anpressen an die Innenwand der Form durch einen Saugzug erfolgt. 2. The method according to claim II, characterized in that the pressing against the inner wall of the mold takes place by suction. 3. Verfahren nach Unteranspruch 1, dadurch gekennzeichnet, dass eine kühlbare Form verwendet wird. 3. The method according to dependent claim 1, characterized in that a coolable mold is used. 4. Verfahren nach Patentanspruch II, dadurch gekennzeichnet, dass eine kalte Form verwendet wird. 4. The method according to claim II, characterized in that a cold mold is used.
CH7019159A 1958-03-28 1959-02-28 Hollow body made of thermoplastic material and process for its manufacture CH372159A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DED27753A DE1218698B (en) 1958-03-28 1958-03-28 Method of making a bottomed container, e.g. B. a drum or drum liner made of thermoplastic material

Publications (1)

Publication Number Publication Date
CH372159A true CH372159A (en) 1963-09-30

Family

ID=7039391

Family Applications (1)

Application Number Title Priority Date Filing Date
CH7019159A CH372159A (en) 1958-03-28 1959-02-28 Hollow body made of thermoplastic material and process for its manufacture

Country Status (6)

Country Link
BE (1) BE576601A (en)
CH (1) CH372159A (en)
DE (1) DE1218698B (en)
GB (1) GB920415A (en)
NL (1) NL237380A (en)
SE (1) SE310416B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010049505B4 (en) * 2010-10-21 2015-10-29 Khs Corpoplast Gmbh Process for producing containers and blow-molded containers

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH458702A (en) * 1966-06-28 1968-06-30 Proplasto Ag Synthetic resin hollow body
CA957624A (en) * 1969-12-17 1974-11-12 E. I. Du Pont De Nemours And Company Biaxially oriented article

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2331688A (en) * 1938-05-13 1943-10-12 Hartford Empire Co Method and apparatus for making hollow articles of plastic mateterial
DE834013C (en) * 1947-08-12 1952-03-13 Plax Corp Method and device for producing hollow bodies from organic, plastic plastic

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010049505B4 (en) * 2010-10-21 2015-10-29 Khs Corpoplast Gmbh Process for producing containers and blow-molded containers

Also Published As

Publication number Publication date
DE1218698B (en) 1966-06-08
SE310416B (en) 1969-04-28
BE576601A (en) 1959-07-01
NL237380A (en)
GB920415A (en) 1963-03-06

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