EP0000872A1 - Process for producing shaped articles from rubber mixtures in powder form - Google Patents

Process for producing shaped articles from rubber mixtures in powder form Download PDF

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Publication number
EP0000872A1
EP0000872A1 EP78100521A EP78100521A EP0000872A1 EP 0000872 A1 EP0000872 A1 EP 0000872A1 EP 78100521 A EP78100521 A EP 78100521A EP 78100521 A EP78100521 A EP 78100521A EP 0000872 A1 EP0000872 A1 EP 0000872A1
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EP
European Patent Office
Prior art keywords
plasticized
screw
powder form
rubber mixtures
deformed
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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.)
Granted
Application number
EP78100521A
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German (de)
French (fr)
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EP0000872B1 (en
Inventor
Jozef Peter Lehnen
Gerd Zingelmann
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Bayer AG
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Bayer AG
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    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
    • 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
    • B29B7/00—Mixing; Kneading
    • B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
    • B29B7/06—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices
    • B29B7/10—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary
    • B29B7/12—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary with single shaft
    • B29B7/16—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary with single shaft with paddles or arms
    • 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
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
    • B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
    • B29B7/40—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft
    • B29B7/42—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft with screw or helix
    • B29B7/428—Parts or accessories, e.g. casings, feeding or discharging means
    • B29B7/429—Screws
    • 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
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/58—Component parts, details or accessories; Auxiliary operations
    • B29B7/60—Component parts, details or accessories; Auxiliary operations for feeding, e.g. end guides for the incoming material
    • 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
    • B29B7/00—Mixing; Kneading
    • B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
    • B29B7/7461—Combinations of dissimilar mixers
    • 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
    • B29B7/00—Mixing; Kneading
    • B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
    • B29B7/7471—Mixers in which the mixing takes place at the inlet of a mould, e.g. mixing chambers situated in the mould opening
    • 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
    • B29B7/00—Mixing; Kneading
    • B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
    • B29B7/7476—Systems, i.e. flow charts or diagrams; Plants
    • B29B7/7495—Systems, i.e. flow charts or diagrams; Plants for mixing rubber
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed 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
    • 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
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/505—Screws
    • B29C48/535—Screws with thread pitch varying along the longitudinal axis
    • 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
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/505—Screws
    • B29C48/55—Screws having reverse-feeding elements

Definitions

  • Vulcanized rubber articles are generally made by preforming them from plastic, compact rubber compounds and then vulcanizing them by heating.
  • Rubber mixtures in this sense are homogeneous mixtures of rubbers and fillers (reinforcing fillers such as carbon black), vulcanizing agents and auxiliaries.
  • To deform such mixtures into moldings one uses u. a. of injection molding. This method is e.g. very well developed for processing thermoplastic materials.
  • the aim of the present invention is to provide a method and an apparatus which make it possible to produce molded articles which are directly vulcanizable from rubber mixtures in powder form (“powdery finished mixtures”).
  • the invention thus relates to a process for the production of compact, shaped structures from vulcanizable rubber mixtures in powder form with the aid of a screw plasticizing unit, characterized in that the powdered rubber mixture is first brought into the extruder of the screw plasticizing unit through a feed pocket which has a positive effect on conveying, then plasticized in a mixing zone and is compacted by combining the plasticized powder particles and then deformed in a plasticized and homogenized state. Is deformed z. B. by extrusion or preferably by injection molding.
  • This device is a screw plasticizing unit with a filling device and a downstream injection mold, which is characterized by a long undercut in the cylinder of the screw machine and a screw shaft with a conveying part, mixing part and discharge part.
  • This device is able to take up the powdered rubber compound; this would not be possible without an effective rear step in the cylinder. Furthermore, the device allows the mixture once ingested to be compacted, plasticized and then homogenized. This requires a zone which has a strong mixing effect and in which the powder particles are plasticized and lose their structure with the formation of a homogeneous mixture.
  • the shaft preferably has a length: diameter (l / d) ratio of approximately 12 to 20, and the individual zones have approximately the following lengths (expressed as multiples of the diameter):
  • the worm shaft has a special surface configuration: the webs which are in contact with the housing are completely smooth, while the flanks and the worm base are roughened. This can be achieved by sandblasting the worm shaft; An etching of the surface with subsequent hardening is cheaper and more permanent. This can result in irregular recesses in, for example, 0.01-1 mm depth and diameter.
  • the depressions can also be elongated and have a preferred direction (e.g. the direction of the material flow through the screw).
  • Ficur 2 gives a longitudinal section in the axis A - B.
  • the feed pocket (3) is clearly visible.
  • the process according to the invention not only avoids the previously required intermediate plasticization, it also puts less strain on the rubber material used, so that perfect moldings and better vulcanizates are obtained.
  • the mixture is in the form of a free-flowing powder with grain sizes of 0.1 to 2 mm.
  • the mixture is compacted and homogenized in a device according to FIG. 1 and shaped into shoulder protectors for photo shoulder bags in the connected 10-cavity mold and vulcanized in the mold at 160 ° to 200 ° C. for 90 seconds.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

Verfahren zur Herstellung von kompakten, geformten Gebilden aus vulkanisierbaren Gummimischungen in Pulverform mit Hilfe einer Schneckenplastiziereinheit, dadurch gekennzeichnet, dass die pulverförmige Gummimischung zuerst durch eine förderwirksame Einzugstasche (3) in den Extruder gebracht, dann in einer Mischzone (5) plastiziert und durch Vereinigung der plastizierten Pulverteilchen kompaktiert, danach in plastiziertem und homogenisiertem Zustand verformt wird, und eine Vorrichtung zur Durchführung des Verfahrens.Process for the production of compact, shaped structures from vulcanizable rubber mixtures in powder form with the aid of a screw plasticizing unit, characterized in that the powdered rubber mixture is first brought into the extruder through a feed pocket (3) which is effective for conveying, then plasticized in a mixing zone (5) and by combining the plasticized powder particles compacted, then deformed in the plasticized and homogenized state, and a device for performing the method.

Description

Gegenstände aus vulkanisiertem Gummi werden im allgemeinen hergestellt, indem man sie aus plastischen, kompakten Kautschukmischungen vorformt und dann durch Erhitzen vulkanisiert. Kautschukmischungen in diesem Sinn sind homogene Gemische aus Kautschuken und Füllstoffen (Verstärkerfüllstoffen wie Ruß), Vulkanisationsmitteln und Hilfsstoffen. Um solche Mischungen zu Formlingen zu verformen, bedient man sich u. a. des Spritzgießens. Dieses Verfahren ist z.B. zur Verarbeitung von thermoplastischen Kunststoffen sehr gut entwickelt.Vulcanized rubber articles are generally made by preforming them from plastic, compact rubber compounds and then vulcanizing them by heating. Rubber mixtures in this sense are homogeneous mixtures of rubbers and fillers (reinforcing fillers such as carbon black), vulcanizing agents and auxiliaries. To deform such mixtures into moldings, one uses u. a. of injection molding. This method is e.g. very well developed for processing thermoplastic materials.

Für die Verarbeitung von Gummimischungen nach diesem Verfahren bestehen zwei grundsätzliche Schwierigkeiten. Einmal sind Gummimischungen (insbesondere hitzevulkanisierbare) gegen starkes Erwärmen empfindlich - sie vulkanisieren dann vorzeitig - zum anderen können Gummimischungen nicht, wie etwa thermoplastische Kunststoffe, aufgeschmolzen werden, sondern sie werden zur Verarbeitung nur plastifiziert. Die erste Schwierigkeit setzt der thermischen und mechanischen Belastbarkeit der Mischungen enge Grenzen, die zweite Schwierigkeit zwingt dazu, Verarbeitungsmaschinen, insbesondere Schneckenextruder und Spritzgießmaschinen,mit Kautschukmischungen in homogen gemischter und vollständig kompaktierter Form zu beschikken.There are two basic difficulties in processing rubber compounds using this method. On the one hand, rubber mixtures (especially heat-vulcanizable ones) are sensitive to strong heating - they then vulcanize prematurely - on the other hand, rubber mixtures, such as thermoplastic materials, cannot be melted, but are only plasticized for processing. The first difficulty sets narrow limits for the thermal and mechanical resilience of the mixtures, the second difficulty forces Ver to feed processing machines, in particular screw extruders and injection molding machines, with rubber mixtures in a homogeneously mixed and fully compacted form.

Andererseits stehen Gummimischungen seit einiger Zeit auch in Form von Pulvern zur Verfügung ("pulverförmige Fertigmischungen"). Diese physikalische Form besitzt als Gemenge entscheidende Vorteile, insbesondere fertigungstechnischer Art; für die Weiterverarbeitung solcher pulverförmigen Fertigmischungen ist man bisher auf eine speziell ausgestaltete Zwischenkompaktierung des Gemenges angewiesen.On the other hand, rubber mixtures have also been available in the form of powders for some time ("powdery ready-mixes"). This physical form has decisive advantages as a mixture, in particular of a technical production type; For the further processing of such powdered ready mixes, it has hitherto relied on a specially designed intermediate compacting of the batch.

Ziel der vorliegenden Erfindung ist,ein Verfahren und eine Vorrichtung anzugeben, die es gestatten, aus Gummimischungen in Pulverform ("pulverförmige Fertigmischungen") direkt vulkanisierbare Formkörper herzustellen.The aim of the present invention is to provide a method and an apparatus which make it possible to produce molded articles which are directly vulcanizable from rubber mixtures in powder form (“powdery finished mixtures”).

Gegenstand der Erfindung ist somit ein Verfahren zur Herstellung von kompakten, geformten Gebilden aus vulkanisierbaren Gummimischungen in Pulverform mit Hilfe einer Schneckenplastiziereinheit, dadurch gekennzeichnet ist, daß die pulverförmige Gummimischung zuerst durch eine förderwirksame Einzugstasche in den Extruder der Schneckenplastiziereinheit gebracht, dann in einer Mischzone plastiziert und durch Vereinigung der plastizierten Pulverteilchen kompaktiert und danach in plastiziertem und homogenisierten Zustand verformt wird. Verformt wird z. B. durch Extrusion oder bevorzugt durch Spritzgießen.The invention thus relates to a process for the production of compact, shaped structures from vulcanizable rubber mixtures in powder form with the aid of a screw plasticizing unit, characterized in that the powdered rubber mixture is first brought into the extruder of the screw plasticizing unit through a feed pocket which has a positive effect on conveying, then plasticized in a mixing zone and is compacted by combining the plasticized powder particles and then deformed in a plasticized and homogenized state. Is deformed z. B. by extrusion or preferably by injection molding.

Ein weiterer Gegenstand der Erfindung ist eine Vorrichtung zur Durchführung des Verfahrens. Diese Vorrichtung ist eine Schneckenplastiziereinheit mit Einfüllvorrichtung und einer nachgeschalteten Spritzform, die gekenn-zeichnet ist durch einen langen Hinterschnitt im Zylinder der Schneckenmaschine und eine Schneckenwelle mit Förderteil, Mischteil und Austragsteil.Another object of the invention is an apparatus for performing the method. This device is a screw plasticizing unit with a filling device and a downstream injection mold, which is characterized by a long undercut in the cylinder of the screw machine and a screw shaft with a conveying part, mixing part and discharge part.

Diese Vorrichtung ist in der Lage, die pulverförmige Gummimischung aufzunehmen; ohne förderwirksamen Hinterschritt im Zylinder wäre dies nicht möglich. Ferner erlaubt die Vorrichtung, die einmal aufgenommene Mischung zu kompaktieren, zu plastizieren und anschließend zu homogenisieren. Dies erfordert eine Zone, die starke Mischwirkung hat, und in der die Pulverteilchen plastiziert werden und unter Bildung eines homogenen Gemisches ihre Struktur verlieren.This device is able to take up the powdered rubber compound; this would not be possible without an effective rear step in the cylinder. Furthermore, the device allows the mixture once ingested to be compacted, plasticized and then homogenized. This requires a zone which has a strong mixing effect and in which the powder particles are plasticized and lose their structure with the formation of a homogeneous mixture.

Der förderwirksame Hinterschnitt im Zylinder kann beispielsweise wie folgt ausgestaltet sein:

  • Die innere Zylinderwand im Einzugsbereich kann senkrecht und/oder bis zu einem Neigungswinkel von 25° zur Schnekkenachse hinterschliffen sein. Der Hinterschliff ist im Zylindergrund 4 - 6 mm tief und läuft in Förderrichtung in derselben rechtsgängigen Steigung schraubenförmig wie die Schnecke bis max. 270° zur Zylindermitte hin aus.
The relief undercut in the cylinder can be configured as follows, for example:
  • The inner cylinder wall in the intake area can be ground vertically and / or up to an inclination angle of 25 ° to the screw axis. The relief is 4 - 6 mm deep in the cylinder base and runs in the same right-hand slope in the conveying direction as the screw up to max. 270 ° to the center of the cylinder.

Eine bevorzugte Welle für den Schneckenextruder kann wie folgt beschaffen sein:

  • Sie besitzt eine ein- oder mehrgängige Förderzone, eine oder mehrere daran anschließende Scher- und/oder Mischzonen bekannter Art, die das Fördergut (pulverförmige Kautschukmischung) rasch unter Druck setzen und unter langsamer Entspannung walken lassen, eine Mischzone, in der schraubenförmige Stege, gegebenenfalls mit variabler Steigung, schraubenförmigen Nuten mit größerer Steigung überlagert sind, wobei ein oder mehrere Gänge vorhanden sein können, gegebenenfalls eine weitere Scherzone, und eine fördernde Austragszone.
A preferred shaft for the screw extruder can be as follows:
  • It has a single or multi-course conveyor zone, one or more adjoining shear and / or mixing zones of a known type, which quickly pressurize the material to be conveyed (powdered rubber mixture) and allow it to flow with slow relaxation, a mixing zone in which helical webs, if necessary with variable pitch, helical grooves with a larger pitch are superimposed, whereby one or more gears may be present, possibly a further shear zone, and a conveying discharge zone.

Bevorzugt besitzt die Welle ein Verhältnis Länge : Durchmesser (l/d) von ca. 12 bis 20, und die einzelnen Zonen haben etwa folgende Längen (ausgedrückt als Vielfache des Durchmessers):

Figure imgb0001
The shaft preferably has a length: diameter (l / d) ratio of approximately 12 to 20, and the individual zones have approximately the following lengths (expressed as multiples of the diameter):
Figure imgb0001

In einer besonders bevorzugten Ausführungsform hat die Schneckenwelle eine besondere Oberflächenausbildung: die Stege, die mit dem Gehäuse in Berührung stehen, sind vollständig glatt, während die Flanken und der Schneckengrund aufgerauht sind. Man kann dies durch Sandstrahlen der Schneckenwelle erreichen; günstiger und dauerhafter ist eine Ätzung der Oberfläche mit nachfolgender Härtung. Es können dadurch unregelmäßige Vertiefungen in, beispielsweise, 0,01 - 1 mm Tiefe und Durchmesser entstehen. Die Vertiefungen können auch länglich sein und eine Vorzugsrichtung (z.B. die Richtung des Materialflusses durch die Schnecke) haben.In a particularly preferred embodiment, the worm shaft has a special surface configuration: the webs which are in contact with the housing are completely smooth, while the flanks and the worm base are roughened. This can be achieved by sandblasting the worm shaft; An etching of the surface with subsequent hardening is cheaper and more permanent. This can result in irregular recesses in, for example, 0.01-1 mm depth and diameter. The depressions can also be elongated and have a preferred direction (e.g. the direction of the material flow through the screw).

Die Figur 1 gibt das Prinzip der gesamten Vorrichtung im Längsschnitt wieder. Es bedeuten:

  • (1) Einfüllvorrichtung mit Rührwerk (2);
  • (3) Einzugstasche;
  • (4) Schnecke;
  • (5) Mischzonen;
  • (6) Austragszone.
Figure 1 shows the principle of the entire device in longitudinal section. It means:
  • (1) Filling device with agitator (2);
  • (3) feed pocket;
  • (4) snail;
  • (5) mixing zones;
  • (6) discharge zone.

Ficur 2 gibt einen Längsschnitt in der Achse A - B.Ficur 2 gives a longitudinal section in the axis A - B.

Die Einzugstasche (3) ist deutlich erkennbar.The feed pocket (3) is clearly visible.

Das erfindungsgemäße Verfahren läßt sich im Prinzip auf sämtliche Kautschukmischungen in Pulverform anwenden. Bevorzugt sind jedoch Mischungen aus:

  • Polychloropren, Butadien-Acrylnitril-Mischpolymerisate, Styrol-Butadien-Mischpolymerisate, Polybutadien, Naturkautschuk, Äthylen-Propylen-Terpolymerisate als Kautschuk, die Füllstoffe wie Ruß, Vulkanisationshilfsmittel, Stabilisatoren, Alterungs- und Ozonschutzmittel, gegebenenfalls Weichmacheröle und Faktis bereits enthalten.
The method according to the invention can in principle be applied to all rubber mixtures in powder form. Mixtures of:
  • Polychloroprene, butadiene-acrylonitrile copolymers, styrene-butadiene copolymers, polybutadiene, natural rubber, ethylene-propylene terpolymers as rubber, which contain fillers such as carbon black, vulcanization aids, stabilizers, aging and ozone protection agents, optionally plasticizer oils and factice.

Das erfindungsgemäße Verfahren vermeidet nicht nur die bisher erforderliche Zwischenplastizierung, es belastet auch das eingesetzte Kautschukmaterial weniger, so daß einwandfreie Formkörper und bessere Vulkanisate erhalten werden.The process according to the invention not only avoids the previously required intermediate plasticization, it also puts less strain on the rubber material used, so that perfect moldings and better vulcanizates are obtained.

Das folgende Ausführungsbeispiel erläutert das Verfahren:

Figure imgb0002
The following exemplary embodiment explains the method:
Figure imgb0002

Die Mischung liegt vor als rieselfähiges Pulver mit Korngräßen von 0,1 bis 2 mm.The mixture is in the form of a free-flowing powder with grain sizes of 0.1 to 2 mm.

Die Mischung wird in einer Vorrichtung gemäß Figur 1 kompaktiert und homogenisiert und in der angeschlossenen 10-fach-Spritzform zu Schulterschutzstücken für Photoumhängetaschen verformt und bei 160° bis 200°C 90 Sekunden in der Form vulkanisiert.The mixture is compacted and homogenized in a device according to FIG. 1 and shaped into shoulder protectors for photo shoulder bags in the connected 10-cavity mold and vulcanized in the mold at 160 ° to 200 ° C. for 90 seconds.

Claims (4)

1. Verfahren zur Herstellung von kompakten, geformten Gebilden aus vulkanisierbaren Gummimischungen in Pulverform mit Hilfe einer Schneckenplastiziereinheit, dadurch gekennzeichnet , daß die pulverförmige Gummimischung zuerst durch eine förderwirksame Einzugstasche in den Extruder gebracht, dann in einer Mischzone plastiziert, und durch Vereinigung der plastizierten Pulverteilchen kompaktiert, danach in plastiziertem und homogenisierten Zustand verformt wird.1. A process for the production of compact, shaped structures from vulcanizable rubber mixtures in powder form with the aid of a screw plasticizing unit, characterized in that the powdered rubber mixture is first brought into the extruder through a feed pocket which has an effect on the conveyance, then plasticized in a mixing zone, and compacted by combining the plasticized powder particles , is then deformed in a plasticized and homogenized state. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet , daß durch Spritzgießen verformt wird.2. The method according to claim 1, characterized in that is deformed by injection molding. 3. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1, bestehend aus einer Schneckenplastiziereinheit mit Einfüllvorrichtung und einer nachgeschalteten Spritzform, gekennzeichnet durch einen langen Hinterschnitt im Zylinder der Schneckenmaschine und eine Schneckenwelle mit Förderteil, Mischteil und Austragsteil.3. Device for performing the method according to claim 1, consisting of a screw plasticizing unit with filling device and a downstream injection mold, characterized by a long undercut in the cylinder of the screw machine and a screw shaft with conveying part, mixing part and discharge part. 4. Vorrichtung gemäß Anspruch 3, dadurch gekennzeichnet , daß die Oberfläche der Schneckenwelle strukturiert ist.4. The device according to claim 3, characterized in that the surface of the worm shaft is structured.
EP78100521A 1977-08-25 1978-07-27 Process for producing shaped articles from rubber mixtures in powder form Expired EP0000872B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19772738308 DE2738308A1 (en) 1977-08-25 1977-08-25 ELASTIC MOLDED BODY
DE2738308 1977-08-25

Publications (2)

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EP0000872A1 true EP0000872A1 (en) 1979-03-07
EP0000872B1 EP0000872B1 (en) 1981-06-10

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EP78100521A Expired EP0000872B1 (en) 1977-08-25 1978-07-27 Process for producing shaped articles from rubber mixtures in powder form

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US (1) US4246224A (en)
EP (1) EP0000872B1 (en)
JP (1) JPS5443988A (en)
CA (1) CA1110420A (en)
DE (2) DE2738308A1 (en)
ES (1) ES472805A1 (en)
IT (1) IT1106277B (en)

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Publication number Priority date Publication date Assignee Title
JPS60222225A (en) * 1984-04-19 1985-11-06 Ikegai Corp Multiple screw extruder
JPH10216408A (en) * 1996-12-02 1998-08-18 Kobayashi Seisakusho:Kk Dissolver for flocculant
DE102006059219B4 (en) * 2006-12-13 2010-09-16 Carl Freudenberg Kg Process for elastomer processing
JP5388373B2 (en) * 2011-05-30 2014-01-15 株式会社日本製鋼所 Material kneading apparatus and material kneading method
ITUA20164096A1 (en) * 2016-06-03 2017-12-03 Nexxus Channel S R L SCREW FOR EXTRUDER OF POLYMERIC MATERIALS, EXTRUDER OF POLYMERIC MATERIALS INCLUDING THIS SCREW AND METHOD FOR REALIZING EXTRUDED POLYMERIC PRODUCTS
CN111531824B (en) * 2020-04-30 2021-12-07 福建玮晟机械有限公司 Synthetic membrane production line

Citations (2)

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GB1032786A (en) * 1962-11-13 1966-06-15 Shell Int Research A method for the manufacture of vulcanised rubber articles
DE2166744A1 (en) * 1971-10-05 1975-12-11 Kabel Metallwerke Ghh Covers for elongated articles esp cable sheaths - by mixing filler- and elastomer-contg. mixtures immediately before extrusion

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DE1529803B2 (en) * 1964-11-06 1972-02-17 Barmag Barmer Maschinenfabrik Ag, 5600 Wuppertal SCREW EXTRUSION PRESS FOR THERMOPLASTIC PLASTICS
US3953006A (en) * 1974-02-04 1976-04-27 Thiokol Corporation Portable conversion and dispensing apparatus for curable elastomeric compounds
DE2449489A1 (en) * 1974-10-19 1976-04-29 Bayer Ag PROCESS AND DEVICE FOR THE PRODUCTION OF PRE-PLASTICIZED MATERIALS FROM HIGHLY MOLECULAR POWDER-MIXED PREPARATORY MIXTURES
CH614401A5 (en) * 1975-10-24 1979-11-30 Toyo Soda Mfg Co Ltd

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
GB1032786A (en) * 1962-11-13 1966-06-15 Shell Int Research A method for the manufacture of vulcanised rubber articles
DE2166744A1 (en) * 1971-10-05 1975-12-11 Kabel Metallwerke Ghh Covers for elongated articles esp cable sheaths - by mixing filler- and elastomer-contg. mixtures immediately before extrusion

Non-Patent Citations (3)

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Title
JOURNAL OF THE I.R.I., Band 6, Nr. 2, April 1972, Tenterden, T.R. GOSHORN: "Powdered rubber technology-the renaissance of rubber mixing", Seiten 77-80 *
KUNSTSTOFFTECHNIK, Band 9, Nr. 3, M{rz 1970, Mainz, J.P. LEHNEN: "Verarbeitung von kautschukmischungen auf Einschnecken-Extrudern", Seiten 89-93 *
RAPRA ABSTRACTS, Band 11, Nr. 31, Juli 1974, H.A.J. DE KROM: "Powdered rubber future technology: processing and advantages of powdered nitrile rubbers", Nr. 24815L *

Also Published As

Publication number Publication date
DE2860752D1 (en) 1981-09-17
DE2738308A1 (en) 1979-03-08
CA1110420A (en) 1981-10-13
US4246224A (en) 1981-01-20
IT1106277B (en) 1985-11-11
JPS5443988A (en) 1979-04-06
IT7850824A0 (en) 1978-08-23
ES472805A1 (en) 1979-03-16
EP0000872B1 (en) 1981-06-10

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