EP0000872B1 - 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
EP0000872B1
EP0000872B1 EP78100521A EP78100521A EP0000872B1 EP 0000872 B1 EP0000872 B1 EP 0000872B1 EP 78100521 A EP78100521 A EP 78100521A EP 78100521 A EP78100521 A EP 78100521A EP 0000872 B1 EP0000872 B1 EP 0000872B1
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EP
European Patent Office
Prior art keywords
rubber
powder form
rubber mixtures
mixtures
shaped articles
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP78100521A
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German (de)
French (fr)
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EP0000872A1 (en
Inventor
Jozef Peter Lehnen
Gerd Zingelmann
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Bayer AG
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Bayer AG
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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
    • 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 which makes 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 with the aid of a screw plasticizing unit, into which the rubber mixture is first introduced through a feed pocket which is effective for conveyance, in the form of an undercut in the cylinder, then plasticized in a mixing zone, and through Association of the plasticized particles is compacted under pressure, which is characterized in that the feed pocket (3) is supplied with the rubber mixture in powder form, and that the rubber mixture is then deformed in the plasticized and compacted state in order to be able to produce directly vulcanizable moldings.
  • the device for carrying out the method is a screw plasticizing unit with a filling device and a downstream injection mold. It has a long undercut in the cylinder of the screw machine and a screw shaft with a conveyor, mixing and discharge section.
  • This device is able to take up the powdered rubber compound; this would not be possible without an undercut in the cylinder that has a positive effect on conveyance. Furthermore, the device allows the mixture once it has been taken in to be compacted, plasticized and then homogenized. This requires a zone which has a strong mixing action and in which the powder particles are plasticized and lose their structure to form a homogeneous mixture.
  • the effective undercut in the cylinder can, for example, be configured as follows:
  • the inner cylinder wall in the feed area can be ground vertically and / or up to an inclination angle of 25 ° to the screw axis.
  • the relief grinding is 4-6 mm deep in the cylinder base and is screw-shaped in the conveying direction in the same right-hand slope as the worm up to max. 270 ° to the center of the cylinder.
  • the shaft preferably has a length: diameter (1 / 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 design: the webs which come into 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).
  • Figure 2 gives a longitudinal section in the axis A-B.
  • the intake pocket (3) is recognizable on the digestive tract.
  • the process according to the invention not only avoids the intermediate plasticization previously required, 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 particle 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 attached 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)

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 beschicken.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 on the thermal and mechanical strength of the mixtures, the second difficulty forces processing machines, in particular screw extruders and injection molding machines, to be loaded 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. In "Kunststofftechnik" 9 (1970) Nr. 3, Seite 89 ff. wird über die Verarbeitung von Kautschukmischungen auf Einwellenextrudern berichtet. Man kann für die Kautschuke Einfüllöffnungen vorsehen, die einen Hinterschnitt besitzen (vergl. Figur 3 auf S. 93), aber die Vorrichtungen werden nur benutzt zur Verarbeitung von endlosen Kautschukfellen, die auf Walzwerken oder Kalandern hergestellt werden. Pulverförmige Kautschukmischungen werden nicht in Betracht gezogen.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 production-technical nature; For the further processing of such powdery ready-made mixtures, it has hitherto relied on a specially designed intermediate compacting of the batch. "Kunststofftechnik" 9 (1970) No. 3, page 89 ff. Reports on the processing of rubber mixtures on single-shaft extruders. Filling openings can be provided for the rubbers which have an undercut (see FIG. 3 on p. 93), but the devices are only used for processing endless rubber skins which are produced on rolling mills or calenders. Powdered rubber compounds are not considered.

Ziel der vorliegenden Erfindung ist, ein Verfahren 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 which makes 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 mit Hilfe einer Schneckenplastiziereinheit, in welche die Gummimischung zuerst durch eine förderwirksame Einzugstasche, in Form eines Hinterschnittes im Zylinder, eingebracht, dann in. einer Mischzone plastiziert, und durch Vereinigung der plastizierten Teilchen unter Druck kompaktiert wird, das dadurch gekennzeichnet ist, daß der Einzugstasche (3) die Gummimischung in Pulverform zugeführt wird, und daß dann die Gummimischung im plastizierten und kompaktierten Zustand verformt wird, um direkt vulkanisierbare Formkörper herstellen zu können.The invention thus relates to a process for the production of compact, shaped structures from vulcanizable rubber mixtures with the aid of a screw plasticizing unit, into which the rubber mixture is first introduced through a feed pocket which is effective for conveyance, in the form of an undercut in the cylinder, then plasticized in a mixing zone, and through Association of the plasticized particles is compacted under pressure, which is characterized in that the feed pocket (3) is supplied with the rubber mixture in powder form, and that the rubber mixture is then deformed in the plasticized and compacted state in order to be able to produce directly vulcanizable moldings.

Die Vorrichtung zur Durchführung des Verfahrens ist eine Schneckenpiastiziereinheit mit Einfüllvorrichtung und einer nachgeschalteten Spritzform. Sie besitzt einen langen Hinterschnitt im Zylinder der Schneckenmaschine und eine Schneckenwelle mit Förderteil, Mischteil und Austragsteil.The device for carrying out the method is a screw plasticizing unit with a filling device and a downstream injection mold. It has a long undercut in the cylinder of the screw machine and a screw shaft with a conveyor, mixing and discharge section.

Diese Vorrichtung ist in der Lage, die pulverförmige Gummimischung aufzunehmen; ohne förderwirksamen Hinterschnitt 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 undercut in the cylinder that has a positive effect on conveyance. Furthermore, the device allows the mixture once it has been taken in to be compacted, plasticized and then homogenized. This requires a zone which has a strong mixing action and in which the powder particles are plasticized and lose their structure to form a homogeneous mixture.

Der förderwirksame Hinterschnitt im Zylinder kann beispielsweise wie folgt ausgestaltet sein:The effective undercut in the cylinder can, for example, be configured as follows:

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

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

  • Sie besitzt eine ein- oder mehrgängige Förderzone, eine oder mehrere daran anschleißende 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 Nutten mit größerer Steigung überlagert sind, wobei ein oder mehrere Gänge vorhanden sein können, gegebenenfalls eine weitere Scherzone, und eine fördernde Austragzone.
A preferred shaft for the screw extruder can be as follows:
  • It has a single or multi-course conveyor zone, one or more shear and / or mixing zones of known type attached to it, which quickly pressurize the material to be conveyed (powdered rubber mixture) and let it slow down with slow relaxation, a mixing zone in which helical webs, if necessary with variable pitch, helical hookers 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 (1/d) von ca. 12 bis 20, und die einzelnen Zonen haben etwa folgende Längen (ausgedruckt als Vielfache des Durchmessers):

Figure imgb0001
The shaft preferably has a length: diameter (1 / 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 Berühung 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 design: the webs which come into 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.

Figur 2 gibt einen längsschnitt in der Achse A-B. Die Einzugstasche (3) ist dautlich erkennbar.Figure 2 gives a longitudinal section in the axis A-B. The intake pocket (3) is recognizable on the digestive tract.

Das erfindungsgemäße Verfahren läßt sich im Prinzip auf sämtliche Kautschumischungen 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.
In principle, the process according to the invention can 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 belastent auch das eingesetzte Kautschukmaterial weniger, so daß einwandfreie Formkörper und bessere Vulkanisate erhalten werden.The process according to the invention not only avoids the intermediate plasticization previously required, 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 particle 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 verformat 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 attached 10-cavity mold and vulcanized in the mold at 160 ° to 200 ° C. for 90 seconds.

Claims (2)

1. Process for the production of compact, shaped articles from vulcanisable rubber mixtures by means of a screw plasticising unit, into which the rubber mixture is first introduced through a delivery- active feed pocket (3), in the form of an undercut in the barrel, is then plasticised in a mixing zone (5), and compacted by combining the plasticised particles under pressure, characterised in that the rubber mixture is introduced into the feed pocket (3) in powder form, and in that the rubber mixture is then shaped in plasticised and compacted form in order to be able to produce directly vulcanisable moulded products.
2. Process according to claim 1, characterised in that shaping is conducted by injection moulding.
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
DE2738308 1977-08-25
DE19772738308 DE2738308A1 (en) 1977-08-25 1977-08-25 ELASTIC MOLDED BODY

Publications (2)

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

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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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EP0000872A1 (en) 1979-03-07
DE2860752D1 (en) 1981-09-17
JPS5443988A (en) 1979-04-06
US4246224A (en) 1981-01-20
IT7850824A0 (en) 1978-08-23
DE2738308A1 (en) 1979-03-08
IT1106277B (en) 1985-11-11
ES472805A1 (en) 1979-03-16

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