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DE1220116B - Process for processing high molecular weight polyethylene - Google Patents

Process for processing high molecular weight polyethylene

Info

Publication number
DE1220116B
DE1220116B DEA45154A DEA0045154A DE1220116B DE 1220116 B DE1220116 B DE 1220116B DE A45154 A DEA45154 A DE A45154A DE A0045154 A DEA0045154 A DE A0045154A DE 1220116 B DE1220116 B DE 1220116B
Authority
DE
Germany
Prior art keywords
molecular weight
weight polyethylene
high molecular
oxygen
inert gas
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.)
Pending
Application number
DEA45154A
Other languages
German (de)
Inventor
Dr-Ing August Albers
Herbert Goller
Dr-Ing Rudolf Sonntag
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.)
Ankerwerk Gebr Goller
Original Assignee
Ankerwerk Gebr Goller
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 Ankerwerk Gebr Goller filed Critical Ankerwerk Gebr Goller
Priority to DEA45154A priority Critical patent/DE1220116B/en
Publication of DE1220116B publication Critical patent/DE1220116B/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/46—Component parts, details or accessories; Auxiliary operations characterised by using particular environment or blow fluids other than air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • 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
    • B29B13/00—Conditioning or physical treatment of the material to be shaped
    • B29B13/02—Conditioning or physical treatment of the material to be shaped by heating
    • B29B13/022—Melting the material to be 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0001—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; 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
    • 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
    • B29C45/1701—Component parts, details or accessories; Auxiliary operations using a particular environment during moulding, e.g. moisture-free or dust-free
    • 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
    • B29C45/58—Details
    • 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
    • B29C2791/00—Shaping characteristics in general
    • B29C2791/004—Shaping under special conditions
    • B29C2791/005—Using a particular environment, e.g. sterile fluids other than air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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
    • 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
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Description

Verfahren zur Verarbeitung von hochmolekularem Polyäthylen Die Erfindung bezieht sich auf ein Verfahren zur Verarbeitung von hochmolekularem Polyäthylen auf Plastifiziermaschinen, insbesondere Spritzgießmaschinen und Schneckenpressen.Process for processing high molecular weight polyethylene The invention relates to a method for processing high molecular weight polyethylene on plasticizing machines, in particular injection molding machines and screw presses.

Es ist bekannt, daß die Festigkeitswerte eines Formteiles mit zunehmendem Molekulargewicht des Kunststoffes anwachsen. Gleichzeitig nehmen aber auch die Verarbeitungsschwierigkeiten zu, da diese hochmolekularen Stoffe nur schwer aufzuschmelzen sind. It is known that the strength values of a molded part with increasing Molecular weight of the plastic increase. At the same time, however, the processing difficulties also increase because these high-molecular substances are difficult to melt.

In Versuchen auf Schnecken-Spritzgießmaschinen wurde gefunden, daß es mit den bisher bekannten Mitteln und Methoden nicht möglich ist, Polyäthylen mit Molekulargewichten von etwa 400 000 bis zu 2Millionen ohne molekularen Abbau und Minderung der Rohstoffeigenschaften zu Formteilen zu verarbeiten. Selbst bei günstiger Maschineneinstellung wird das Molekulargewicht des Polyäthyleas von 2 Millionen beim Rohmaterial auf 300 000 bis 500 000 beim Formteil reduziert. Ein solch großer Verlust an Molekulargewicht, der auch einen entsprechenden Verlust an Festigkeitswerten bedeutet, entwertet das Verarbeiten von hochmolekularem Polyäthylen. In experiments on screw injection molding machines it was found that it is not possible with the previously known means and methods, polyethylene with molecular weights of about 400,000 up to 2 million without molecular degradation and reducing the raw material properties to process them into molded parts. Even at With a more favorable machine setting, the molecular weight of the polyethylene will be 2 Millions for the raw material reduced to 300,000 to 500,000 for the molded part. A such a great loss in molecular weight that there is also a corresponding loss in strength values means, the processing of high molecular weight polyethylene devalues.

Dieser Abbau des Molekulargewichtes hat im wesentlichen zwei Ursachen, nämlich den thermischen Abbau und den oxydativen Abbau. Der thermische Molekularabbau kann vermieden werden, wenn die zeitliche Temperaturführung im Schneckenzylinder materialgerecht vorgenommen wird, d. h., die für eine Abbaureaktion notwendige Temperatur darf nur so lange auf die Masse wirken, daß die Inkubationszeit nicht überschritten wird. This decrease in molecular weight has essentially two causes, namely thermal degradation and oxidative degradation. The thermal molecular breakdown can be avoided if the temporal temperature control in the screw cylinder is made appropriate to the material, d. that is, the temperature necessary for a degradation reaction may only act on the mass so long that the incubation time is not exceeded will.

Die Erfindung beinhaltet ein Verfahlen, nach dem hochmolekulares Polyäthylen bei den hierfür nötigen hohen Temperaturen plastifiziert und geformt werden kann, ohne daß der oxydative Molekularabbau, der bei diesem Stoff in besonders starkem Maße die Eigenschaften des Rohstoffes reduziert, eintritt. The invention includes a process according to the high molecular weight Polyethylene is plasticized and shaped at the high temperatures required for this can be without the oxidative molecular degradation, which is particularly common in this substance greatly reduced the properties of the raw material occurs.

Dies wird erfindungsgemäß dadurch erreicht, daß der Kunststoff in sauerstofffreier Atmosphäre verarbeitet wird. Die sauerstofffreie Atmosphäre erhält man dadurch, daß z. B. bei einer Spritzgießmaschine Stickstoff oder ein anderes hierfür geeignetes Inertgas in den Plastifizierzylinder und/oder in die Formhöhlung des Spritzgußwerkzeuges eingeblasen wird, so daß der Luftsauerstoff daraus verdrängt wird. This is achieved according to the invention in that the plastic in oxygen-free atmosphere is processed. Preserves the oxygen-free atmosphere one by the fact that z. B. in an injection molding machine nitrogen or another inert gas suitable for this in the plasticizing cylinder and / or in the mold cavity of the injection molding tool is blown in, so that the atmospheric oxygen is displaced from it will.

In einem Vergleichsversuch wurden Formteile einmal nach dem erfindungsgemäßen Verfahren und einmal nach dem üblichen Verfahren bei normaler Atmosphäre auf einer Schnecken-Spritzgießmaschine gespritzt. Bei der Durchführung des Vergleichsversuches wurde auf die Einhaltung exakt gleicher Verarbeitungstemperaturen geachtet, um den Einfluß des thermischen Abbaues auszuschließen. In a comparative experiment, molded parts were once according to the invention Procedure and once by the usual procedure in normal atmosphere on one Injection screw injection molding machine. When carrying out the comparative experiment care was taken to maintain exactly the same processing temperatures in order to achieve the Exclude the influence of thermal degradation.

Die Spritzlinge wurden anschließend einer Reißfestigkeitsprüfung bei 1200 C Prüftemperatur unterzogen. Die unter normaler Atmosphäre hergestellten Formteile hatten dabei eine Reißfestigkeit von 46 kp/cm2, die unter Stickstoffatmosphäre hergestellten Teile hatten eine Reißfestigkeit von 75 kp/cm2. The injection molded parts were then subjected to a tear strength test at 1200 C test temperature. Those made under normal atmosphere Molded parts had a tear strength of 46 kp / cm2, which was achieved under a nitrogen atmosphere The parts produced had a tear strength of 75 kgf / cm2.

Durch das Verfahren nach der Erfindung konnte die Reißfestigkeit bei 1200 C also um 63°/o erhöht werden.By the method according to the invention, the tear strength could be 1200 C should therefore be increased by 63%.

Der durch die Erfindung erzielte technische Fortschritt beruht darauf, daß hochmolekulares Polyäthylen unter weitgehender Erhaltung seiner optimalen Eigenschaften verarbeitet werden kann. Dadurch wird es möglich, Formteile mit so hohen Festigkeitswerten herzustellen, wie dies mit den bisher bekannten Verfahren unmöglich ist. In wirtschaftlicher Hinsicht bedeutet dies, daß das erfindungsgemäße Verfahren dem hochmolekularen Polyäthylen neue Anwendungsgebiete erschließt.The technical progress achieved by the invention is based on that high molecular weight polyethylene while largely maintaining its optimal properties can be processed. This makes it possible to produce molded parts with such high strength values to produce, as is impossible with the previously known methods. In economic Regard, this means that the process according to the invention the high molecular weight polyethylene opens up new areas of application.

Das Verfahren nach der Erfindung kann jedoch nicht nur bei den bereits genannten Maschinen angewendet werden, sondern es kann auch sinngemäß bei Kunststoffpressen, Blasautomaten oder ähnlichen Vorrichtungen vorteilhaft zum Einsatz kommen. However, the method according to the invention can not only be used for those already machines mentioned, but it can also be used analogously for plastic presses, Blow molding machines or similar devices are advantageously used.

Claims (4)

Patentansprüche: 1. Verfahren zur Verarbeitung von hochmolekularem Polyäthylen auf Plastifiziermaschinen, insbesondere Spritzgießmaschinen und Schneckenpressen, dadurch gekennzeichnet, daß der Kunststoff in allen Verfahrensstufen, in denen er über seinen Erweichungspunkt hinaus erwärmt ist, in sauerstofffreier Atmosphäre verarbeitet wird. Claims: 1. Method for processing high molecular weight Polyethylene on plasticizing machines, especially injection molding machines and screw presses, characterized in that the plastic in all process stages, in which it is heated above its softening point, in oxygen-free Atmosphere is processed. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Plastifizierzylinder an einer beliebigen Stelle, vorzugsweise jedoch in dem gesamten Bereich, den der Kunststoff mit einer über seinem Erweichungspunkt liegenden Temperatur passiert, durch Einblasen eines Inertgases sauerstofffrei gemacht wird. 2. The method according to claim 1, characterized in that the plasticizing cylinder at any point, but preferably in the entire area that the Plastic passes at a temperature above its softening point, is made oxygen-free by blowing in an inert gas. 3. Verfahren nach Anspruch, dadurch gekennzeichnet, daß die Formhöhlung des Spritzguß-Werkzeuges, in die der plastifizierte Kunststoff eingebracht werden soll, vor und/oder während der Formfüllung durch Einblasen eines Inertgases sauerstofffrei gemacht wird. 3. The method according to claim, characterized in that the mold cavity of the injection molding tool into which the plasticized plastic is introduced should be oxygen-free before and / or during the filling of the mold by blowing in an inert gas is made. 4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der aus der Düse einer Schneckenpresse austretende Strang bis zum Erreichen seiner Erstarrungstemperatur mit einem Inertgas umgeben wird. 4. The method according to claim 1, characterized in that the from the strand exiting the nozzle of a screw press until it has reached its solidification temperature is surrounded with an inert gas.
DEA45154A 1964-02-05 1964-02-05 Process for processing high molecular weight polyethylene Pending DE1220116B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEA45154A DE1220116B (en) 1964-02-05 1964-02-05 Process for processing high molecular weight polyethylene

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEA45154A DE1220116B (en) 1964-02-05 1964-02-05 Process for processing high molecular weight polyethylene

Publications (1)

Publication Number Publication Date
DE1220116B true DE1220116B (en) 1966-06-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
DEA45154A Pending DE1220116B (en) 1964-02-05 1964-02-05 Process for processing high molecular weight polyethylene

Country Status (1)

Country Link
DE (1) DE1220116B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0042768A1 (en) * 1980-06-25 1981-12-30 American Hoechst Corporation Injection molding and extrusion of ultra-high molecular weight polyethylene
WO1989005225A1 (en) * 1987-12-04 1989-06-15 Bucher-Guyer Ag Maschinenfabrik Process and device for making plastic mouldings
EP0425060A3 (en) * 1989-10-27 1992-01-29 Mitsubishi Jukogyo Kabushiki Kaisha Process for injection molding and apparatus therefor
US5478520A (en) * 1989-10-27 1995-12-26 Mitsubishi Jukogyo Kabushiki Kaisha Process for injection molding and apparatus therefor
WO2000056510A1 (en) * 1999-03-24 2000-09-28 Sipa S.P.A. Method and apparatus for the treatment of materials in the production of hollow bodies of polyethylene terephtalate

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0042768A1 (en) * 1980-06-25 1981-12-30 American Hoechst Corporation Injection molding and extrusion of ultra-high molecular weight polyethylene
WO1989005225A1 (en) * 1987-12-04 1989-06-15 Bucher-Guyer Ag Maschinenfabrik Process and device for making plastic mouldings
EP0425060A3 (en) * 1989-10-27 1992-01-29 Mitsubishi Jukogyo Kabushiki Kaisha Process for injection molding and apparatus therefor
US5478520A (en) * 1989-10-27 1995-12-26 Mitsubishi Jukogyo Kabushiki Kaisha Process for injection molding and apparatus therefor
WO2000056510A1 (en) * 1999-03-24 2000-09-28 Sipa S.P.A. Method and apparatus for the treatment of materials in the production of hollow bodies of polyethylene terephtalate

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