EP0000872B1 - Procédé de fabrication d'objets façonnés à partir de mélanges de caoutchouc sous forme pulvérulente - Google Patents

Procédé de fabrication d'objets façonnés à partir de mélanges de caoutchouc sous forme pulvérulente 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
Authority
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
Other languages
German (de)
English (en)
Other versions
EP0000872A1 (fr
Inventor
Jozef Peter Lehnen
Gerd Zingelmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bayer AG
Original Assignee
Bayer AG
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 Bayer AG filed Critical Bayer AG
Publication of EP0000872A1 publication Critical patent/EP0000872A1/fr
Application granted granted Critical
Publication of EP0000872B1 publication Critical patent/EP0000872B1/fr
Expired legal-status Critical Current

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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.

Landscapes

  • 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)

Claims (2)

1. Procédé de fabrication d'articles moulés compactés en des mélanges de caoutchouc vulcanisables à l'aide d'une unité de plastification à vis sans fin dans laquelle le mélange de caoutchouc est d'abord introduit à travers une poche d'alimentation à effet de transport (3), sous forme d'une dépression dans le cylindre, puis est plastifié dans une zone de mélange (5) et est compacté par réunion des particules plastifiées sous pression, caractérisé en ce qu'à la poche d'alimentation (3) est amené le mélange de caoutchouc sous une forme pulvérulente et en ce qu'alors le mélange de caoutchouc est moulé à l'état plastifié et compacté pour pouvoir fabriquer directement des corps moulés vulcanisables.
2. Procédé selon la revendication 1, caractérisé en ce que le moulage est effectué suivant la méthode de moulage par injection.
EP78100521A 1977-08-25 1978-07-27 Procédé de fabrication d'objets façonnés à partir de mélanges de caoutchouc sous forme pulvérulente Expired EP0000872B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2738308 1977-08-25
DE19772738308 DE2738308A1 (de) 1977-08-25 1977-08-25 Elastische formkoerper

Publications (2)

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

Family

ID=6017265

Family Applications (1)

Application Number Title Priority Date Filing Date
EP78100521A Expired EP0000872B1 (fr) 1977-08-25 1978-07-27 Procédé de fabrication d'objets façonnés à partir de mélanges de caoutchouc sous forme pulvérulente

Country Status (7)

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

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60222225A (ja) * 1984-04-19 1985-11-06 Ikegai Corp 多軸押出機
JPH10216408A (ja) * 1996-12-02 1998-08-18 Kobayashi Seisakusho:Kk 凝集剤の溶解機
DE102006059219B4 (de) * 2006-12-13 2010-09-16 Carl Freudenberg Kg Verfahren zur Elastomerverarbeitung
JP5388373B2 (ja) 2011-05-30 2014-01-15 株式会社日本製鋼所 材料混練装置及び材料混練方法
ITUA20164096A1 (it) * 2016-06-03 2017-12-03 Nexxus Channel S R L Vite per estrusore di materiali polimerici, estrusore di materiali polimerici comprendente detta vite e metodo per realizzare prodotti polimerici estrusi
CN111531824B (zh) * 2020-04-30 2021-12-07 福建玮晟机械有限公司 一种合成膜生产线

Family Cites Families (6)

* Cited by examiner, † Cited by third party
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
DE1529803B2 (de) * 1964-11-06 1972-02-17 Barmag Barmer Maschinenfabrik Ag, 5600 Wuppertal Schneckenstrangpresse fuer thermoplastische kunststoffe
DE2166744B2 (de) * 1971-10-05 1977-05-18 Ausscheidung aus: 21 49 668 Kabel- und Metallwerke Gutehoffnungshütte Kabelwerk Berlin GmbH, 1000 Berlin Verfahren zum herstellen von langgestrecktem gut aus einer elastomermischung
US3953006A (en) * 1974-02-04 1976-04-27 Thiokol Corporation Portable conversion and dispensing apparatus for curable elastomeric compounds
DE2449489A1 (de) * 1974-10-19 1976-04-29 Bayer Ag Verfahren und vorrichtung zur herstellung von auf enddichte vorplastizierten werkstoffen aus hoch molekularen pulverfoermigen fertigmischungen
CH614401A5 (fr) * 1975-10-24 1979-11-30 Toyo Soda Mfg Co Ltd

Also Published As

Publication number Publication date
CA1110420A (fr) 1981-10-13
US4246224A (en) 1981-01-20
IT7850824A0 (it) 1978-08-23
DE2738308A1 (de) 1979-03-08
DE2860752D1 (en) 1981-09-17
EP0000872A1 (fr) 1979-03-07
JPS5443988A (en) 1979-04-06
IT1106277B (it) 1985-11-11
ES472805A1 (es) 1979-03-16

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