CH404948A - Process for the production of hollow bodies, preferably from thermoplastics - Google Patents

Process for the production of hollow bodies, preferably from thermoplastics

Info

Publication number
CH404948A
CH404948A CH1468262A CH1468262A CH404948A CH 404948 A CH404948 A CH 404948A CH 1468262 A CH1468262 A CH 1468262A CH 1468262 A CH1468262 A CH 1468262A CH 404948 A CH404948 A CH 404948A
Authority
CH
Switzerland
Prior art keywords
nozzle
hollow bodies
plastic material
stiffening elements
sided
Prior art date
Application number
CH1468262A
Other languages
German (de)
Inventor
Helmut Danzer Josef
Original Assignee
Helmut Danzer Josef
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 Helmut Danzer Josef filed Critical Helmut Danzer Josef
Publication of CH404948A publication Critical patent/CH404948A/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
    • B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
    • B29C71/04—After-treatment of articles without altering their shape; Apparatus therefor by wave energy or particle radiation, e.g. for curing or vulcanising preformed 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/11—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels comprising two or more partially or fully enclosed cavities, e.g. honeycomb-shaped
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/12—Articles with an irregular circumference when viewed in cross-section, e.g. window profiles
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
    • B29C48/901—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies
    • B29C48/903—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies externally
    • 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
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/14—Twisting
    • 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
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/22—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of tubes
    • B29C55/26—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of tubes biaxial
    • 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
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • B29C2035/085—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using gamma-ray
    • 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
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0866—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using particle radiation
    • B29C2035/0872—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using particle radiation using ion-radiation, e.g. alpha-rays
    • 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
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0866—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using particle radiation
    • B29C2035/0877—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using particle radiation using electron radiation, e.g. beta-rays
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B29C48/9115—Cooling of hollow articles
    • B29C48/912—Cooling of hollow articles of tubular films
    • B29C48/913—Cooling of hollow articles of tubular films externally
    • 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
    • B29K2101/00—Use of unspecified macromolecular compounds as moulding material
    • B29K2101/10—Thermosetting resins
    • 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
    • B29K2301/00—Use of unspecified macromolecular compounds as reinforcement
    • B29K2301/10—Thermosetting resins

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Description

  

  
 



  Verfahren zur Herstellung von HohLkörpern, vorzugsweise aus thermoplastischen
Kunststoffen
Es ist bekannt, dass Rohre, Profilstangen oder dergleichen Hohlkörper aus Metallen erhebliche Nachteile besitzen, z. B. dass Stahlrohre sehr leicht rosten, gegen Wasser und Witterungseinflüsse sehr empfindlich sind und mit verhältnismässig teuren Mitteln korrosions- und wetterfest gemacht werden müssen. Solche Mittel sind naturgemäss aber nur eine verhältnismässig kurze Zeit wirksam, deren Korrosionsmittelaufbringung verhältnismässig reuer und erfordern ausserdem eine laufende Wartung. Dies trifft auch mehr oder weniger bei anderen Metallen zu, die dann allerdings noch erheblich teurer sind.



  Hinzu kommt der Nachteil des hohen Gewichtes und dass Profilrohre verhältnismässig schwierig in der Herstellung sind und sehr teurer   Fertigungsmittel    bedürfen.



   Rohre aus Kunststoffen, vorzugsweise thermoplastischen Kunststoffen, haben trotz zusätzlicher Profilierung bisher bei gleichen Abmessungen im Verhältnis zu Metallrohren nicht genügend Stabilität, so dass deren Verwendung sich in der Praxis nur zum geringen Teil hat durchsetzen können.



   Es wurde nun gefunden, dass Hohlkörper, vorzugsweise aus thermoplastischen Kunststoffen, mit ausreichender Festigkeit hergestellt werden können, wenn gemäss dem Verfahren nach der Erfindung im Innenraum in Strangpress-Verfahren hergestellten Hohlkörper statische Versteifungselemente angeordnet werden, und dass das die Düse verlassende vorgeformte, noch plastische Material schneller gezogen wird, als es die Düse   herausbriugt,    so dass dadurch eine Streckung erfolgt; dass dann das noch plastische Material eine Vakuum-Durchlaufdüse durchläuft, die das Profil radial ausweitet und dadurch sowohl die Versteifungselemente als auch die Hülle streckt sowie anschliessend durch Kühlung unter Vakuum massgenau verfestigt, und dass das Material schliesslich durch eine Hohlkammer geführt wird, in welcher es einer Korpuskular-Strahlung unterworfen wird.



   Durch den Dehn- und Streckvorgang wird eine   Molekülverlagerung    vorgenommen, der die Moleküle in eine Richtung, und zwar in die Dehnrichtung, bringt, wobei die Moleküle sich ineinander verketten, wodurch sich eine vielfache Zugfestigkeit des thermoplastischen Kunststoffes ergibt. Infolge sowohl der Dehnung als auch der Streckung und der dadurch hervorgerufenen Ineinanderkettung der Moleküle wird das Rohrprofil in seiner Gesamtheit wesentlich verfestigt und ausser der Biegungsfestigkeit auch die Reissfestigkeit erheblich heraufgesetzt, wobei durch Anwendung von überwiegender Dehnung oder umgekehrt der Streckung verschiedene Eigenschaften der Biegung und Reissfestigkeit in Beziehung gebracht werden können.

   Durch die   nach-    folgende Behandlung des fertig geformten verfestigten Rohres mit einer Korpuskular-Strahlung wird das Molekulargefüge und durch   Atomverlagerungen    die Gesamtstruktur beeinflusst, wodurch eine zusätzliche Netzverflechtung der Moleküle eine weit höhere mechanische Festigkeit und eine ebenfalls erheblich höhere thermische Belastbarkeit sowie Standfestigkeit erzielt wird.



   Zusätzlich kann das die Düse verlassende plastische Material bei der Streckung und/oder radialen Dehnung einen einseitigen und/oder doppelseitigen Drall erhalten. Dadurch wird eine zusätzliche Stabilisierung in Querrichtung erreicht, wodurch z. B. gewisse federnde Eigenschaften nach einer Richtung und Versteifung in der entgegengesetzten Richtung erzeugt wird.



   Auch können die axial verlaufenden Versteifungselemente gegenüber dem anderen Material durch   Überdruck mit mehr Material-Durchsatz infolge entsprechender Formgebung der Düse versehen werden, so dass die Radialversteifungen in axialer Richtung eine Schlangenlinie bilden und dadurch eine zusätzliche Versteifung erhalten wird.



   Es ist auch vorteilhaft, das bereits geformte Material vor oder nach der Abkühlung zusätzlich zur Behandlung mit Alpha-, Beta- sowie Gamma-Strahlung einer Nieder- oder Hochfrequenzbehandlung in Form von Wechsel- oder pulsierendem Gleichstrom induktiv oder magnetisch zu unterwerfen. Dadurch können zusätzlich bestimmte Eigenschaften hinzugefügt werden, z. B. erhöhter oder verringerter elektrischer Widerstand oder eine andere magnetische Eigenschaft, oder auch je nach Richtung eine höhere Reissfestigkeit bzw. nach der anderen Richtung niedrigere Elastizität oder umgekehrt.



   Auf der Zeichnung sind einige Ausführungsformen der Versteifungselemente und die Apparatur für den Verfahrensablauf schematisch dargestellt.



   Es zeigen:
Fig. 1, 2 und 3 verschiedene Formen der Versteifungselemente der Formkörper in Seitenansicht,
Fig. 4 die Verfahrensapparatur in schematischem Aufbau und
Fig. 5 und 6 eine weitere Ausführungsform eines Hohlkörpers im Querschnitt bzw. Längsschnitt.



   Im Innenraum der Hohlkörper 1 sind Versteifungselemente 2 angeordnet. In Fig. 4 ist mit 3 die Düse der Strangpressmaschine und mit 4 eine Vakuumdurchlaufdüse bezeichnet, welche mehrere Abteile a bis f enthält, die die verschiedenen Kälteund Wärmezonen darstellen. Die Düse 4 ist mit einem Verbindungsrohr 6 zum Vakuumgerät versehen. Mit 5 ist eine einen Strahler 7 enthaltende Hohlkammer bezeichnet.



   Bei der in den Fig. 5 und 6 dargestellten Ausführungsform bestehen die Versteifungselemente aus zylindrischen Hohlkörpern 9, in welche in Längsrichtung Drähte 8 eingebettet sind, vorzugsweise unter Spannung. Dadurch wird eine ausserordentlich grosse Biegefestigkeit und Elastizität erreicht.   



  
 



  Process for the production of hollow bodies, preferably from thermoplastic ones
Plastics
It is known that tubes, profile bars or the like hollow bodies made of metals have considerable disadvantages, e.g. B. that steel pipes rust very easily, are very sensitive to water and weather conditions and have to be made corrosion and weatherproof with relatively expensive means. Naturally, however, such agents are only effective for a relatively short time, their application of the corrosion agent is relatively more efficient, and they also require ongoing maintenance. This also applies more or less to other metals, which are then, however, considerably more expensive.



  In addition, there is the disadvantage of high weight and the fact that profile tubes are relatively difficult to manufacture and require very expensive manufacturing equipment.



   Pipes made of plastics, preferably thermoplastics, have not yet had sufficient stability despite additional profiling with the same dimensions in relation to metal pipes, so that their use has only been able to gain acceptance in practice to a small extent.



   It has now been found that hollow bodies, preferably from thermoplastics, can be produced with sufficient strength if, according to the method according to the invention, static stiffening elements are arranged in the interior in the extrusion process, and that the preformed, still plastic ones leaving the nozzle Material is pulled faster than the nozzle pulls it out, causing stretching; that the still plastic material then passes through a vacuum flow-through nozzle, which radially expands the profile and thereby stretches both the stiffening elements and the shell and then solidifies it with precise dimensions by cooling under vacuum, and that the material is finally passed through a hollow chamber in which it is subjected to corpuscular radiation.



   The stretching and stretching process causes a displacement of the molecules, which brings the molecules in one direction, namely in the stretching direction, the molecules interlinking, resulting in a multiple tensile strength of the thermoplastic material. As a result of both the elongation and the elongation and the resulting interlinking of the molecules, the pipe profile is substantially strengthened in its entirety and, in addition to the flexural strength, the tear strength is also considerably increased, whereby by using predominant elongation or vice versa the elongation different properties of the flexure and tear strength in Relationship can be brought.

   The subsequent treatment of the finished, solidified tube with a corpuscular radiation influences the molecular structure and the overall structure is influenced by atomic displacements, whereby an additional interweaving of the molecules achieves a much higher mechanical strength and also a considerably higher thermal load capacity and stability.



   In addition, the plastic material leaving the nozzle can receive a one-sided and / or double-sided twist during stretching and / or radial expansion. This provides additional stabilization in the transverse direction, whereby z. B. certain resilient properties is generated in one direction and stiffening in the opposite direction.



   The axially extending stiffening elements can also be provided with more material throughput than the other material by overpressure as a result of the corresponding shape of the nozzle, so that the radial stiffeners form a serpentine line in the axial direction and thus additional stiffening is obtained.



   It is also advantageous to subject the already formed material to a low or high frequency treatment in the form of alternating or pulsating direct current inductively or magnetically in addition to the treatment with alpha, beta and gamma radiation, before or after cooling. This allows certain properties to be added, e.g. B. increased or decreased electrical resistance or another magnetic property, or, depending on the direction, a higher tear strength or lower elasticity in the other direction or vice versa.



   Some embodiments of the stiffening elements and the apparatus for the process sequence are shown schematically in the drawing.



   Show it:
1, 2 and 3 different shapes of the stiffening elements of the molded body in side view,
4 shows the process apparatus in a schematic structure and
5 and 6 a further embodiment of a hollow body in cross section and longitudinal section.



   Stiffening elements 2 are arranged in the interior of the hollow body 1. In Fig. 4, 3 denotes the nozzle of the extrusion press and 4 denotes a vacuum flow nozzle which contains several compartments a to f, which represent the various cold and warm zones. The nozzle 4 is provided with a connecting pipe 6 to the vacuum device. 5 with a hollow chamber containing a radiator 7 is designated.



   In the embodiment shown in FIGS. 5 and 6, the stiffening elements consist of cylindrical hollow bodies 9 in which wires 8 are embedded in the longitudinal direction, preferably under tension. This achieves extremely high flexural strength and elasticity.

Claims (1)

PATENTANSPRUCH Verfahren zur Herstellung von Hohlkörpern, dadurch gekennzeichnet, dass im Innenraum der im Strangpress-Verfahren hergestellten Hohlkörper (1) statische X ersteifungselemente (2) angeordnet sind, und dass das die Düse (3) verlassende vorgeformte, noch plastische Material schneller gezogen wird, als es die Düse herausbringt, so dass dadurch eine Strekkung erfolgt; das noch plastische Material dann eine Vakuum-Durchlaufdüse (4) durchläuft, die das Profil radial ausweitet und dadurch sowohl die Versteifungselemente als auch die Hülle streckt sowie anschliessend durch Kühlung unter Vakuum massgenau verfestigt; und dass das Material schliesslich durch eine Hohlkammer (5) geführt wird, in welcher es einer Korpuskular-Strahlung unterworfen wird. PATENT CLAIM Method for producing hollow bodies, characterized in that static X reinforcement elements (2) are arranged in the interior of the hollow bodies (1) produced by the extrusion process, and that the preformed, still plastic material leaving the nozzle (3) is drawn faster than it brings out the nozzle so that it is stretched; the still plastic material then passes through a vacuum flow nozzle (4), which radially expands the profile and thereby stretches both the stiffening elements and the shell and then solidifies it with precise dimensions by cooling under vacuum; and that the material is finally passed through a hollow chamber (5) in which it is subjected to corpuscular radiation. UNTERANSPRÜCHE 1. Verfahren nach Patentanspruch, dadurch gekennzeichnet, dass das die Düse verlassende plastische Material bei der Streckung und/oder radialen Dehnung zusätzlich einen einseitigen und/oder doppelseitigen Drall erhält. SUBCLAIMS 1. The method according to claim, characterized in that the plastic material leaving the nozzle is additionally given a one-sided and / or double-sided twist during the stretching and / or radial expansion. 2. Verfahren nach Patentanspruch und Unteranspruch 1, dadurch gekennzeichnet, dass die axial verlaufenden Versteifungselemente gegenüber dem anderen Material durch Überdruck mit mehr Materialdurchsatz infolge entsprechender Formgebung der Düse versehen werden. 2. The method according to claim and dependent claim 1, characterized in that the axially extending stiffening elements are provided with more material throughput compared to the other material by overpressure due to the corresponding shaping of the nozzle. 3. Verfahren nach Patentanspruch und Unteransprüchen 1 und 2, dadurch gekennzeichnet, dass das bereits geformte Material vor oder nach der Abkühlung zusätzlich zur Behandlung mit Alpha-, Beta- sowie Gama-Strahlung einer Nieder- oder Hochfrequenzbehandlung in Form von Wechsel- oder pulsierendem Gleichstrom induktiv oder magnetisch unterworfen wird. 3. The method according to claim and dependent claims 1 and 2, characterized in that the already formed material before or after cooling in addition to treatment with alpha, beta and Gama radiation a low or high frequency treatment in the form of alternating or pulsating direct current is subjected inductively or magnetically.
CH1468262A 1961-12-14 1962-12-14 Process for the production of hollow bodies, preferably from thermoplastics CH404948A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DED37671A DE1228399B (en) 1961-12-14 1961-12-14 Process for the production of hollow plastic bodies, such as pipes or the like.

Publications (1)

Publication Number Publication Date
CH404948A true CH404948A (en) 1965-12-31

Family

ID=7043708

Family Applications (1)

Application Number Title Priority Date Filing Date
CH1468262A CH404948A (en) 1961-12-14 1962-12-14 Process for the production of hollow bodies, preferably from thermoplastics

Country Status (5)

Country Link
CH (1) CH404948A (en)
DE (1) DE1228399B (en)
FR (1) FR1345288A (en)
GB (1) GB967411A (en)
NL (1) NL286641A (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3935357A (en) * 1973-03-27 1976-01-27 I. S. A. P. S.P.A. Hollow extruded plastic strips for packings
US4168944A (en) * 1976-08-24 1979-09-25 Ngk Spark Plug Co., Ltd. Apparatus for manufacturing a tubular honeycomb assembly with an adiabatic layer formed integrally on the peripheral wall
GB1572100A (en) * 1977-06-10 1980-07-23 Hepworth Iron Co Ltd Plastics pipe couplings
EP0158951B1 (en) * 1984-04-19 1989-07-05 Röhm Gmbh Extruded multilayer cross-braced plate having many cross-braces, and method and apparatus for its manufacture
GB8527300D0 (en) * 1985-11-06 1985-12-11 Victaulic Plc Extrusion of products
DE102012101036A1 (en) 2012-02-08 2013-08-08 Manfred Binder Adjustable calibration sleeve

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH286948A (en) * 1950-12-02 1952-11-15 S A Unitubo Process for obtaining a plastic tube.
DE1061484B (en) * 1955-01-11 1959-07-16 Willy Ruesch Injection device for the production of multiple cardiac catheters

Also Published As

Publication number Publication date
DE1228399B (en) 1966-11-10
FR1345288A (en) 1963-12-06
GB967411A (en) 1964-08-19
NL286641A (en) 1900-01-01

Similar Documents

Publication Publication Date Title
DE3407230C2 (en)
CH404948A (en) Process for the production of hollow bodies, preferably from thermoplastics
DE2542388A1 (en) METHOD OF MANUFACTURING A METAL REINFORCING STRIP
DE2202022B2 (en) Elastic metal thread and process for its manufacture
CH412304A (en) Process for the production of wash basins, bathtubs, shower cups or the like
DE3907785A1 (en) Plastic pipe and process for its production
DE2603615A1 (en) Thermoplastics tube bundles esp. for sewage filter bed - made by fusing together tubes at their ends
DE944891C (en) Process for improving the properties of synthetic long-chain polyamides
DE3726395C2 (en)
DE1627640A1 (en) Process for skin-passaging a long product made of carbon steel, in particular for use in prestressed concrete, and products obtained by this process
DE1780125A1 (en) Reinforced rubber or plastic items
AT318905B (en) Device for stretching a tubular film made of thermoplastic material
AT211535B (en) Device for the production of reinforced plastic pipes
DE2035992B2 (en) PROCESS FOR MANUFACTURING FILLING BODIES FROM PLASTIC FOR DROPPERS IN BIOLOGICAL TREATMENT PLANTS AND DEVICE FOR CARRYING OUT THE PROCESS
DE2366018A1 (en) PLASTIC PIPE
AT362441B (en) PLASTIC PIPE AND METHOD FOR THE PRODUCTION THEREOF
DE7805820U1 (en) REINFORCED HOSE MADE OF THERMOPLASTIC FLUOROPLASTICS
AT218560B (en) Process for strengthening rod or wire-shaped, profiled reinforcing steel
AT243584B (en) Method for integrating a high pressure hose into a hose fitting
DE825391C (en) Metal pipe bandaged in a cold way
AT291531B (en) Method and device for the production of endless drive belts and conveyor belts
DE865134C (en) Process for the production of pipes with cylindrical multiple walls
AT207097B (en) Device for connecting pipes, rods or the like.
DE973798C (en) Process for the production of composite finned pipes for feed water preheaters, air heaters and heat exchangers
DE895434C (en) Process for the production of high pressure hollow bodies