DE2304572B2 - Process for the production of moldings from a composite web with a carrier layer made from a styrene polymer - Google Patents

Process for the production of moldings from a composite web with a carrier layer made from a styrene polymer

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Publication number
DE2304572B2
DE2304572B2 DE2304572A DE2304572A DE2304572B2 DE 2304572 B2 DE2304572 B2 DE 2304572B2 DE 2304572 A DE2304572 A DE 2304572A DE 2304572 A DE2304572 A DE 2304572A DE 2304572 B2 DE2304572 B2 DE 2304572B2
Authority
DE
Germany
Prior art keywords
polycarbonate
composite web
moldings
styrene polymer
carrier layer
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.)
Ceased
Application number
DE2304572A
Other languages
German (de)
Other versions
DE2304572A1 (en
Inventor
Barbara Geppert
Kurt Huth
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.)
Bellaplast GmbH
Original Assignee
Bellaplast GmbH
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 Bellaplast GmbH filed Critical Bellaplast GmbH
Priority to DE2304572A priority Critical patent/DE2304572B2/en
Priority to BR976973A priority patent/BR7309769D0/en
Priority to FR7344760A priority patent/FR2216109B1/fr
Priority to ZA740078A priority patent/ZA7478B/en
Priority to GB379174A priority patent/GB1456556A/en
Publication of DE2304572A1 publication Critical patent/DE2304572A1/en
Publication of DE2304572B2 publication Critical patent/DE2304572B2/en
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
    • 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
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/0005—Direct recuperation and re-use of scrap material during moulding operation, i.e. feed-back of used 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
    • B29C31/00—Handling, e.g. feeding of the material to be shaped, storage of plastics material before moulding; Automation, i.e. automated handling lines in plastics processing plants, e.g. using manipulators or robots
    • B29C31/004—Arrangements for converting the motion of a material which is continuously fed to a working station in a stepwise motion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • 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
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • 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
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/305—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets
    • B29C48/307—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets specially adapted for bringing together components, e.g. melts within the die
    • 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
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/14—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor using multilayered preforms or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00—Layered products having a general shape other than plane
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/302—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B32B27/365—Layered products comprising a layer of synthetic resin comprising polyesters comprising polycarbonates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
    • B65D1/34—Trays or like shallow containers
    • B65D1/36—Trays or like shallow containers with moulded compartments or partitions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/34—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package
    • B65D81/343—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package specially adapted to be heated in a conventional oven, e.g. a gas or electric resistance oven
    • 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
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0017—Combinations of extrusion moulding with other shaping operations combined with blow-moulding or thermoforming
    • 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
    • B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2007/00—Flat articles, e.g. films or sheets
    • B29L2007/008—Wide strips, e.g. films, webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2009/00—Layered products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/70—Food packaging
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/62—Plastics recycling; Rubber recycling

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Ceramic Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Food Science & Technology (AREA)
  • Robotics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Laminated Bodies (AREA)

Description

Die Erfindung bezieht sich auf ein Verfahren zum Herstellen von Formungen aus einer Verbundbahn mit einer Trägerschicht aus einem Styrolpolymeren.The invention relates to a method for producing shapes from a composite web with a carrier layer made of a styrene polymer.

Aus der DE-OS 19 24 560 ist es bekannt, dünnwandige Formlinge durch Thermoformen aus einer Verbundbahn herzustellen, die eine Trägerschicht aus einem Styrolpolymeren aufweist. Bei dieser bekannten Herstellung von Formungen ist jedoch vorgesehen, die Trägerschicht aus einem Polystyrol hoher Kerbschlagzähigkeit und die Oberflächenschicht aus Standard-Polystyrol mit ggf. einpolymerisierten Mitteln zur Verhinderung elektrostatischer Aufladung zu bilden. Die gemäß der DE-OS 19 24 560 hergestellten Formlinge zeichnen sich durch besondere Oberflächeneigenschaften aus, beispielsweise erhöhte Härte, Glanz und Vermeidung von elektrostatischer Aufladung.From DE-OS 19 24 560 it is known to thermoform thin-walled moldings from a composite web produce which has a carrier layer made of a styrene polymer. In this known production However, the support layer is made of a polystyrene of high impact strength and the surface layer made of standard polystyrene with any preventive agents polymerized into it to form electrostatic charge. The moldings produced according to DE-OS 19 24 560 are characterized by special surface properties, such as increased hardness, gloss and Avoidance of electrostatic charge.

Nach der US-PS 28 15 308 ist es bekannt, die Oberflächen einer extrudierten Bahn aus Polystyrol durch eine aufgewalzte Folie aus Polystyrol zu vergüten.According to US-PS 28 15 308 it is known, the surfaces of an extruded sheet of polystyrene to be remunerated by a rolled-on polystyrene film.

In beiden Fällen kann aber nicht der Tatsache Rechnung getragen werden, daß Polystyrol für manche Benutzungszwecke, insbesondere zum Verpacken gewisser Lebensmittel, nicht erwünschte physiologische Eigenschaften aufweist. Es ist daher bekannt, Folien aus Polystyrol mit einem Film aus Polyolefin zu beschichten (US-PS 35 89 976). Hierbei hat man jedoch in erster Linie die Steifigkeit von Polystyrol und die Festigkeitseigenschaften von Polyolefinen zu vereinigen versucht. In both cases, however, the fact that polystyrene is for some cannot be taken into account Uses, in particular for packaging certain foods, undesirable physiological Has properties. It is therefore known to coat films made of polystyrene with a film made of polyolefin (U.S. Patent 3,589,976). Here, however, attempts have primarily been made to combine the rigidity of polystyrene and the strength properties of polyolefins.

Schließlich ist es bekannt, Verbundfolien für Verpakkungszwecke, also Einwickelfolien mit einer Schicht aus einem Copolymeren aus Vinylidenchlorid, Vinylchlorid und Acrylnitril und einer Schicht aus Polycarbonat zu bilden.Finally, it is known to use composite films for packaging purposes, that is to say wrapping films with one layer a copolymer of vinylidene chloride, vinyl chloride and acrylonitrile and a layer of polycarbonate form.

Sowohl die aus der US-PS 34 20 679 bekannten Verpackungsfolien als auch die aus der US-PS 35 89 976 bekannten Verbundfolien sind nicht als Zwischenprodukt für das Herstellen von Formungen vorgesehen.Both the packaging films known from US Pat. No. 3,420,679 and those from US Pat. No. 3,589,976 known composite films are not intended as an intermediate product for the production of moldings.

Demgegenüber ist es Aufgabe der Erfindung, möglichst billige Formlinge aus einer Verbundbahn mit einer Trägerschicht aus einem Styrolpolymeren herzustellen, die zumindest an einer Oberfläche verbesserte lebensmittel-physiologische Eigenschaften und verbesserte Formbeständigkeit bei höherer Temperatur aufweisen.In contrast, it is the object of the invention to provide the cheapest possible molded articles from a composite web with to produce a carrier layer made of a styrene polymer which improved at least on one surface food-physiological properties and improved dimensional stability at higher temperatures exhibit.

Zur Lösung dieser Aufgabe schlägt die Erfindung die Verwendung von Polycarbonat für wenigstens eine Auflageschicht vor, wobei das Polycarbonat und das Styrolpolymere getrennt voneinander erhitzt sowie zu einer Verbundbahn koextrudiert werden und wobei die Verbundbahn unmittelbar anschließend zu den Formungen geformt wird.To solve this problem, the invention proposes the use of polycarbonate for at least one Support layer before, the polycarbonate and the styrene polymer heated separately from one another and closed a composite web are coextruded and wherein the composite web immediately subsequent to the formations is shaped.

Die gemäß der Erfindung hergestellten Formlinge zeichnen sich durch wesentlich erhöhte Wärme-Formbeständigkeit aus. Dies ermöglicht es, solche Formlinge als Verpackungsbehälter, ζ. B. B. als Eß- oder Trinkgefäße, mit Lebensmittel zu füllen, einzufrieren und vor dem Verzehr in abgepacktem Zustand auf die Verzehrtemperatur zu erwärmen. Außerdem ist ein Sterilisieren desThe moldings produced according to the invention are distinguished by a significantly increased heat resistance the end. This makes it possible to use such briquettes as packaging containers, ζ. B. B. as eating or drinking vessels, to be filled with food, to be frozen and packaged to the consumption temperature before consumption to warm up. In addition, a sterilization of the

ίο Füllgutes, insbesondere auch von Lebensmitteln, in den erfindungsgemäß hergestellten Behältern möglich. Ferner zeichnen sich die hergestellten Formlinge auch durch wesentlich verbesserte mechanische Eigenschaften aus. Hierzu zählt auch eine größere Kältebeständigkeit, d. h., die Tatsache, daß die Formlinge auch bei sehr tiefen Temperaturen nicht verspröden. Dadurch sind die Formlinge auch als Verpackungsbehälter für Tiefkühlkost geeignet. Schließlich haben die erfindungsgemäßen Formlinge an der Polycarbonat-Oberfläche eine verbesserte chemische Beständigkeit, insbesondere gegen Fette und Säuren, wodurch eine verbesserte Eignung für das Verpacken von Fruchtsaftgetränken und fetthaltigen Produkten erreicht wird.
Trotz aller dieser Vorteile hat man Polycarbonat bisher nicht in der erfindungsgemäßen Weise angewendet, weil dieser Anwendungsweise erhebliche technische Schwierigkeiten entgegenstanden. Einerseits ist bekannt, daß Polycarbonat hygroskopisch ist und bereits Spuren von Feuchtigkeit geeignet sind, Polycarbonat in plastiziertem geschmolzenem Zustand chemisch umzusetzen, d. h. zu verseifen und abzubauen (Beck »Spritzgießen«, Hanser-Verlag München 1963, Seite 113). Eine weitere bekannte technische Schwierigkeit besteht darin, daß Polycarbonat keine gute Haftung an Styrolpolymeren bietet, so daß damit gerechnet werden muß, daß die Formlingwand an der Trennfläche zwischen dem Polycarbonat und dem Styrolpolymerem aufsplittert.ίο Filling goods, in particular also of foodstuffs, are possible in the containers produced according to the invention. Furthermore, the moldings produced are also distinguished by significantly improved mechanical properties. This also includes greater resistance to cold, ie the fact that the moldings do not become brittle even at very low temperatures. This means that the briquettes are also suitable as packaging containers for frozen food. Finally, the molded articles according to the invention have an improved chemical resistance on the polycarbonate surface, in particular to fats and acids, as a result of which an improved suitability for the packaging of fruit juice drinks and fatty products is achieved.
Despite all these advantages, polycarbonate has not hitherto been used in the manner according to the invention, because this type of application was opposed to considerable technical difficulties. On the one hand, it is known that polycarbonate is hygroscopic and even traces of moisture are suitable for chemically converting polycarbonate in a plasticized, molten state, ie to saponify and degrade it (Beck "Spritzgießen", Hanser-Verlag Munich 1963, page 113). Another known technical difficulty is that polycarbonate does not adhere well to styrene polymers, so that it must be expected that the molding wall will splinter at the interface between the polycarbonate and the styrene polymer.

Es wurde jedoch gefunden, daß sich durch das bei derHowever, it has been found that the

■to erfindungsgemäßen Anwendung des Polycarbonats vorgesehene !Coextrudieren der Verbundbahn und unmittelbar anschließende Verformen dieser Verbundbahn die angegebenen Schwierigkeiten überwinden lassen und bei den so hergestellten Formungen außer■ to inventive use of the polycarbonate Coextruding the composite web and immediately subsequent deformation of this composite web can overcome the difficulties indicated and except for the moldings so produced

« den gewünschten Oberflächeneigenschaften an der Polycarbonatschicht auch die für Einmalgebrauchs-Artikel völlig ausreichende Haftung zwischen der Auflageschicht aus Polycarbonat und der Trägerschicht aus einem Styrolpolymeren erzielbar ist.«The desired surface properties on the polycarbonate layer, including those for single-use items completely sufficient adhesion between the support layer made of polycarbonate and the carrier layer a styrene polymer is achievable.

Eine wesentliche Verbesserung und Weiterbildung der Erfindung wird durch ein Styrolpolymeres zur Durchführung der Verwendung erreicht, das einen Anteil von bis zu 20 Gew.% Polycarbonat aus nach dem Verfahren anfallendem Abfallkunststoff enthält. Hierdurch läßt sich das Haftvermögen der Auflageschicht aus Polycarbonat auf der Trägerschicht aus einem solchen Styrolpolymeren wesentlich verbessern. Dabei hat sich herausgestellt, daß ein Beimischen von Polycarbonat zu Styrolpolymeren möglich ist ohne die Stabilität des Materials wesentlich herabzusetzen. Dabei bietet sich außerdem der Vorteil, daß der aus dem Verfahren anfallende Abfallkunststoff eingemahlen und wieder mitverarbeitet werden kann. Es hat sich bei Erprobungen herausgestellt, daß Styrolpolymeren in einem Gewichts-Prozentsatz bis zu etwa 20% Polycarbonat ohne wesentlichen Stabilitätsverlust beigemischt werden kann.
Ein Ausführungsbeispiel des Gegenstandes derA significant improvement and further development of the invention is achieved by a styrene polymer for carrying out the use, which contains a proportion of up to 20% by weight of polycarbonate from waste plastic produced by the process. As a result, the adhesion of the polycarbonate support layer to the support layer made of such a styrene polymer can be significantly improved. It has been found that it is possible to mix polycarbonate with styrene polymers without significantly reducing the stability of the material. This also has the advantage that the waste plastic resulting from the process can be ground in and processed again. Tests have shown that styrene polymers can be admixed with polycarbonate in a weight percentage of up to about 20% without any significant loss of stability.
An embodiment of the subject matter of

Erfindung ist in der Zeichnung dargestellt Es zeigtInvention is illustrated in the drawing It shows

F i g. 1 einen gefüllten Fertigmenü-Teller im Querschnitt als Beispiel eines erfindungsgemäß hergestellten Formlings,F i g. 1 shows a filled ready-made menu plate in cross section as an example of one produced according to the invention Moldings,

F i g. 2 einen Wandausschnitt Il gemäß F i g. 1 in stark vergrößertem Maßstab,F i g. 2 shows a wall section II according to FIG. 1 in strong enlarged scale,

Fig.3 einen Deckelausschnitt IU gemäß Fig. 1 in stark vergrößertem Maßstab,3 shows a cover section IU according to FIG. 1 on a greatly enlarged scale,

F i g. 4 einen Extrudierkopf zum !Coextrudieren e>ner Verbundbahn für die Formlinge gemäß F i g. 1 undF i g. 4 an extrusion head for coextruding a Composite web for the briquettes according to FIG. 1 and

Fig.5 und 6 zwei Beispiele für das sich an das !Coextrudieren der Verbundbahn gemäß Fig.4 anschließende Thermoformen.Fig. 5 and 6 show two examples of the ! Subsequent coextrusion of the composite sheet according to FIG Thermoforming.

Ein als Fertigmenü Teller 1 ausgebildeter Formling mit einem Tellerboden 2, einer Umfangswand 3 und einem flanschartig nach außen geformten Tellerrand 4 ist einstückig aus einer vorher erzeugten Verbundbahn 10 durch Thermoformen hergestellt Ein Deckel 6 zum Verschließen des Fertigmenü-Tellers 1 ist aus einer anderen Verbundbahn 10' durch Thermofo.men hergestellt und mittels eines angeformten Rastrandes 7 über den Tellerrand 4 gerastet.A formed as a ready-made menu plate 1 molding with a plate base 2, a peripheral wall 3 and a plate rim 4 shaped like a flange to the outside is made in one piece from a composite web produced beforehand 10 produced by thermoforming. A lid 6 for closing the ready-made menu plate 1 is made of a other composite web 10 'produced by Thermofo.men and by means of a molded locking edge 7 over the edge of the plate 4 latched.

Die Verbundbahn 10 für den Fertigmenü-Teller 1 besteht aus einer Trägerschicht 11 aus schlagfestem Polystyrol, das eine Kerbschlagzähigkeit in der Größe von etwa 8 kj/m2 und eine Bruch-Dehnung von etwa 45% sowie einen Ε-Modul von etwa 200 000 N/mm2 aufweist und zu diesem Zweck mit einem entsprechenden Butadienanteil versetzt ist, aus einer an der Innenseite aufgebrachten Auflageschicht 12, die etwa 20% der Wanddicke einnimmt und aus Polycarbonat besteht, und aus einer Außenschicht 13 aus Standard-Polystyrol mit beigemischten Mitteln zur Vermeidung elektrostatischer Aufladung (Fig. 2). Das Polycarbonat der Auflageschicht 12 ist ein Standardmaterial mit einer Temperaturbeständigkeit zwischen —100 bis +135°C, einer Dichte von etwa 1.2, einem Schmelzbereich bei 220 bis 2300C und einem Molekulargewicht von 25 000 bis 50 000.The composite web 10 for the ready-made meal plate 1 consists of a carrier layer 11 made of impact-resistant polystyrene, which has a notched impact strength of about 8 kj / m 2 and an elongation at break of about 45% and a Ε module of about 200,000 N. / mm 2 and for this purpose is mixed with a corresponding butadiene content, from a coating layer 12 applied to the inside, which takes up about 20% of the wall thickness and consists of polycarbonate, and an outer layer 13 made of standard polystyrene with added agents to prevent it electrostatic charge (Fig. 2). The polycarbonate of the support layer 12 is a standard material with a temperature resistance of between -100 to + 135 ° C, a density of about 1.2, a melting range at 220 to 230 0 C and a molecular weight from 25,000 to 50,000.

Dem Polystyrol der Trägerschicht 11 kann Polycarbonat der Auflageschicht 12 und Polystyrol der Außenschicht 13 beigemischt sein. Das Mischungsverhältnis zwischen Polycarbonat und Polystyrol wird jedoch in einem Bereich gehalten, bei dem eine möglichst unverminderte Stabilität des Materials der Trägerschicht 11 gewährleistet ist.The polystyrene of the carrier layer 11 can be polycarbonate the support layer 12 and polystyrene of the outer layer 13 may be added. The mixing ratio between polycarbonate and polystyrene, however, is kept in a range in which one as possible undiminished stability of the material of the carrier layer 11 is guaranteed.

Die Verbundbahn 10' des Deckels 6 besteht aus einer Trägerschicht 17 aus schlagfestem Polystyrol in transparenter oder eingefärbter Ausführung, und aus einer Auflageschicht 18 aus Polycarbonat in Standardausführung (F ig. 3).The composite web 10 'of the cover 6 consists of a carrier layer 17 made of impact-resistant polystyrene in transparent or colored version, and from a support layer 18 made of polycarbonate in the standard version (Fig. 3).

Die Verbundfolie 10, aus der Formlinge durch Thermoformen hergestellt werden sollen, werden mit einem Extrudierkopf 20 koextrudiert (Fig.4). Dieser Extrudierkopf 20 hat eine mittlere, kanalartige Kammer 21, eine obere, kanalartige Kammer 22 und eine untere, kanalartige Kammer 23. Alle drei Kammern 21, 22 und 23 erstrecken sich über die gesamte Breite des Extrudierkopfes 20.The composite film 10, from which moldings are to be produced by thermoforming, are with an extrusion head 20 coextruded (Figure 4). This extrusion head 20 has a central, channel-like chamber 21, an upper, channel-like chamber 22 and a lower, channel-like chamber 23. All three chambers 21, 22 and 23 extend over the entire width of the extrusion head 20.

Zum Koextrudieren der Verbundbahn 10 mit einer Gesamtdicke von etwa 1000 μιη sind die Kammern 21,For coextruding the composite web 10 with a total thickness of about 1000 μm, the chambers 21,

ίο 22 und 23 so aufeinander abgestimmt, daß die von der Kammer 22 erzeugte Schicht etwa 20% der Gesamtdikke und die von der unteren Kammer 23 erzeugte Schicht nur etwa 2 bis 3% der Gesamtdicke einnimmt Die mittlere Kammer 21 wird mit einem Gemisch von schlagfestem Polystyrol und anfallendem Abfallkunststoff beschickt. Hierzu wird, wie durch den Pfeil 25 angedeutet, dosiert frisches schlagfestes Polystyrol und, wie durch den Pfeil 26 angedeutet, auch aus dem Verfahren kommender Abfallkunststoff in dosierter Menge zugeführt.ίο 22 and 23 so coordinated that the Chamber 22 created layer about 20% of the total thickness and the layer created by the lower chamber 23 occupies only about 2 to 3% of the total thickness. The middle chamber 21 is filled with a mixture of Loaded with impact-resistant polystyrene and waste plastic. For this purpose, as indicated by arrow 25 indicated, dosed fresh impact-resistant polystyrene and, as indicated by the arrow 26, also from the Process coming waste plastic supplied in dosed quantities.

Der Kammer 22 wird Polycarbonat zugeführt, während die Kammer 23 mit Standard-Polystyrol mit beigemischten Mitteln zur Verhinderung der elektrostatischen Oberflächenaufladung beschickt wird. Die vomThe chamber 22 is supplied with polycarbonate, while the chamber 23 with standard polystyrene added agents to prevent electrostatic surface charge is charged. The ones from

21) Extrudierkopf 20 koextrudierte Verbundbahn 10 wird durch Glättwalzen 31,32,33 gekühlt.2 1 ) Extrusion head 20 coextruded composite web 10 is cooled by smoothing rollers 31,32,33.

Die F i g. j und 6 zeigen schematisch das Verarbeiten der Verbundbahn 10 in einer sich an die Einrichtung nach F i g. 4 anschließenden Thermoformvorrichtung 50 und in einer Stanzvorrichtung 60. Hinter der Thermoformvorrichtung 50 werden die Formlinge an den sie umgebenden Randbereichen in der Stanzvorrichtung 60 ausgeschnitten und, wie durch den Pfeil 61 angedeutet, transportiert.The F i g. j and 6 schematically show the processing the composite web 10 in a to the device according to F i g. 4 subsequent thermoforming device 50 and in a punching device 60. Behind the thermoforming device 50, the moldings are attached to them surrounding edge areas are cut out in the punching device 60 and, as indicated by the arrow 61, transported.

γ> Im Beispiel der Fig. 5 wird das nur schwache Haftvermögen zwischen der Auflageschicht 12 aus Polycarbonat und der Trägerschicht 11 aus Polystyrol dazu benutzt, um die Restbahn 30, aus der die Formlinge ausgeschnitten worden sind, mittels einer Trennvorrichtung 64 aufzuspalten, um so eine Abfallbahn 12' aus Polycarbonat und eine Abfallbahn 11' aus Polystyrol zu bilden. Beide Abfallbahnen 11' und 12' können zerkleinert und in den Herstellungsgang zurückgeführt werden.γ> In the example of FIG. 5 this is only weak Adhesion between the support layer 12 made of polycarbonate and the support layer 11 made of polystyrene used to cut the remaining web 30, from which the briquettes have been cut, by means of a separating device 64 split so as to form a waste sheet 12 'made of polycarbonate and a waste sheet 11' made of polystyrene form. Both waste webs 11 'and 12' can be comminuted and returned to the production process will.

■Ti Das Beispiel gemäß F i g. 6 unterscheidet sich von demjenigen nach F i g. 5 darin, daß nach dem Ausscheiden der Formlinge die Restbahn 30 noch zusammenhaftet und einer Zerkleinerungs- und Aufbereitungsvorrichtung 65 zugeführt, und danach — wie der Pfeil 26■ Ti The example according to FIG. 6 differs from that according to FIG. 5 in the fact that after the molded articles have separated out, the remaining web 30 is still adhering to one another and a comminution and processing device 65, and then - like the arrow 26

μ andeutet — in dosierter Weise in die Kammer 21 des Extrudierkopfes 20 eingegeben wird.μ indicates - in a dosed manner in the chamber 21 of the Extruding head 20 is entered.

Hierzu 3 Blatt ZeichnungenFor this purpose 3 sheets of drawings

Claims (2)

Patentansprüche:Patent claims: 1. Verwendung von Polycarbonat für wenigstens eine Auflageschicht bei einem Verfahren zum Herstellen von Formungen aus einer Verbundbahn mit einer Trägerschicht aus einem Styrolpolymeren, bei welchem Verfahren das Polycarbonat und das Styrolpolymere getrennt voneinander erhitzt sowie zu einer Verbundbahn koextrudiert werden und bei welchem die Verbundbahn unmittelbar anschließend zu den Formungen geformt wird.1. Use of polycarbonate for at least one support layer in a method for Production of moldings from a composite web with a carrier layer made from a styrene polymer, in which process the polycarbonate and the styrene polymer are heated separately from one another and are coextruded to form a composite web and in which the composite web immediately thereafter is formed into the formations. 2. Styrolpolymeres zur Durchführung der Verwendung nach Anspruch 1, gekennzeichnet durch einen Anteil von bis zu 20 Gew.% Polycarbonat aus nach dem Verfahren anfallendem Abfallkunststoff.2. styrene polymer for carrying out the use according to claim 1, characterized by a proportion of up to 20% by weight of polycarbonate from waste plastic produced by the process.
DE2304572A 1973-01-31 1973-01-31 Process for the production of moldings from a composite web with a carrier layer made from a styrene polymer Ceased DE2304572B2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE2304572A DE2304572B2 (en) 1973-01-31 1973-01-31 Process for the production of moldings from a composite web with a carrier layer made from a styrene polymer
BR976973A BR7309769D0 (en) 1973-01-31 1973-12-13 ROCESS TO MANUFACTURE THE SAME MOLDED PIECES OF THERMOPLASTIC SYNTHETIC MATERIALS, AND
FR7344760A FR2216109B1 (en) 1973-01-31 1973-12-14
ZA740078A ZA7478B (en) 1973-01-31 1974-01-04 Shaped articles of thermoplastic plastics material and process for their production
GB379174A GB1456556A (en) 1973-01-31 1974-01-28 Duction thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2304572A DE2304572B2 (en) 1973-01-31 1973-01-31 Process for the production of moldings from a composite web with a carrier layer made from a styrene polymer

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DE2304572A1 DE2304572A1 (en) 1974-08-01
DE2304572B2 true DE2304572B2 (en) 1979-04-19

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DE2304572A Ceased DE2304572B2 (en) 1973-01-31 1973-01-31 Process for the production of moldings from a composite web with a carrier layer made from a styrene polymer

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BR (1) BR7309769D0 (en)
DE (1) DE2304572B2 (en)
FR (1) FR2216109B1 (en)
GB (1) GB1456556A (en)
ZA (1) ZA7478B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2916492A1 (en) * 1978-04-26 1979-11-08 Mitsubishi Petrochemical Co LAMINATED PLASTIC RAILWAY MATERIAL
US4335181A (en) * 1980-07-01 1982-06-15 Mobil Oil Corporation Microwaveable heat and grease resistant containers
US4338365A (en) * 1980-12-31 1982-07-06 Mobil Oil Corporation Boilable pouch for foods
DE3279203D1 (en) * 1981-03-16 1988-12-15 Heinz Georg Baus Method for producing multi-layered plates
DE3206164C2 (en) * 1981-03-16 1985-02-21 Heinz Georg Hünibach Thun Baus Device for the production of multi-layer panels
FR2636930B1 (en) * 1988-09-08 1993-12-24 Larzul Sa Joseph MIXED MEAL PLATES, MONOPORTIONS READY TO HEAT
ES2283167B1 (en) * 2004-09-15 2008-08-16 Valentin Masa Alcorlo PACK FOR PRODUCTS.
CN113290808B (en) * 2021-05-21 2022-08-05 浙江中聚材料有限公司 Manufacturing equipment for multi-layer co-extrusion solar backboard

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3649437A (en) * 1969-08-07 1972-03-14 Du Pont Thermoformed folding cartons

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DE2304572A1 (en) 1974-08-01
FR2216109B1 (en) 1977-03-04
ZA7478B (en) 1974-12-24
BR7309769D0 (en) 1974-10-22
FR2216109A1 (en) 1974-08-30
GB1456556A (en) 1976-11-24

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