EP0822890A1 - Process and device for producing co-extruded foam composites - Google Patents

Process and device for producing co-extruded foam composites

Info

Publication number
EP0822890A1
EP0822890A1 EP96911957A EP96911957A EP0822890A1 EP 0822890 A1 EP0822890 A1 EP 0822890A1 EP 96911957 A EP96911957 A EP 96911957A EP 96911957 A EP96911957 A EP 96911957A EP 0822890 A1 EP0822890 A1 EP 0822890A1
Authority
EP
European Patent Office
Prior art keywords
foam composite
polymer melt
mixing insert
composite bodies
melt streams
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.)
Withdrawn
Application number
EP96911957A
Other languages
German (de)
French (fr)
Inventor
Jean-Francois Beguin
Dieter Heck
Paul Despineux
Herbert Kohl
Ralf Klinkenberg
Erich Brandt
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.)
NMC SA
Original Assignee
NMC SA
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
Priority claimed from LU88604A external-priority patent/LU88604A1/en
Application filed by NMC SA filed Critical NMC SA
Publication of EP0822890A1 publication Critical patent/EP0822890A1/en
Withdrawn legal-status Critical Current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
    • 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
    • B29C48/12—Articles with an irregular circumference when viewed in cross-section, e.g. window profiles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F29/00—Mixers with rotating receptacles
    • B01F29/25—Mixers with rotating receptacles with material flowing continuously through the receptacles from inlet to discharge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F29/00—Mixers with rotating receptacles
    • B01F29/60—Mixers with rotating receptacles rotating about a horizontal or inclined axis, e.g. drum mixers
    • B01F29/63—Mixers with rotating receptacles rotating about a horizontal or inclined axis, e.g. drum mixers with fixed bars, i.e. stationary, or fixed on the receptacle
    • 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
    • B29C48/19—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their edges
    • 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
    • B29C48/20—Articles comprising two or more components, e.g. co-extruded layers the components being layers one of the layers being a strip, e.g. a partially embedded strip
    • 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
    • B29C48/06—Rod-shaped
    • 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
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous

Definitions

  • the present invention relates to a method and a device for producing coextruded foam composite bodies.
  • German Offenlegungsschrift DE-OS 4 316 863 describes a
  • Foam composite body which is produced from at least two different polymer melts, the individual parallel or concentric layers of the foamed polymer melts in the end product being sharply separated from one another and nevertheless firmly connected to one another at their contact surfaces.
  • the polymer melts are brought into connection with one another at an empirically determined distance before the nozzle outlet, without mixing, in the extruder die.
  • US Pat. No. 5,190,706 describes a device for the production of foam composite bodies, two polymer melt streams being brought together in an extruder die and one of the two polymer melt streams being applied to the surface of the second polymer melt stream through an opening in the extruder die.
  • This opening can contain a nozzle, whereby the first polymer melt stream is applied in a certain pattern to the surface of the second polymer melt stream.
  • only a very limited number of patterns can be produced on the surface of the second polymer melt stream.
  • this object is achieved by a method for producing foam composite bodies, wherein at least two foamable polymer melt streams having different physical and / or chemical properties are brought together in an extruder die after gassing.
  • the method according to the invention is characterized in that the polymer melt streams are at least partially mixed and / or twisted and then coextruded, so that any pattern is formed in the mass of the foam composite body.
  • only the polymer melt streams are at least partially mixed and / or twisted, but not the polymer melts themselves. Homogeneous mixing of the polymer melts is not sought, the boundaries between the individual polymer melt streams remain sharp and clearly visible in the finished product.
  • the polymer melt streams are firmly welded together over the entire contact area.
  • This method enables e.g. Manufacture foam composite bodies which, because of the mixing and / or twisting of the individual polymer melt streams, have any pattern in their mass.
  • the method according to the invention is not very susceptible to faults. It allows foam composites to be manufactured easily and inexpensively.
  • the foam composite bodies of the present invention can not only be used for decorative purposes, but also foam composite bodies with new physical and / or chemical properties can be produced.
  • foam composite bodies with new physical and / or chemical properties can be produced.
  • polymer melt streams with different properties are mixed together.
  • the type and intensity of the mixing makes it possible to tailor the properties of the foam composite that are produced by this process to the respective requirements.
  • Foam composites produced by this process can be used to mark products in a different manner, as is the case today with e.g. is the case with electrical cables.
  • the foam composite bodies thus produced can also be used in the packaging or in the leisure industry.
  • the polymer melt streams are mixed and / or twisted into one another by controlled rotation of a mixing insert fitted in at least two of the polymer melt streams and then coextruded through an extrusion head.
  • the mixing insert applied in at least two of the polymer melt streams is rotated about its own axis at between 1 and 100 revolutions per minute.
  • the speed of rotation of the mixing insert is best infinitely variable and the mixing insert should be rotatable in both directions about its own longitudinal axis. Due to the rotating mixing insert, you can create an almost unlimited
  • the polymer melt streams can be brought together upstream of the mixing insert and then passed through the mixing insert. This makes it possible to mix and / or twist many different polymer melt streams with one another.
  • the polymer melt streams can also be conducted separately to the mixing insert and only combined within the mixing insert. bring. In this case, however, normally only two polymer melt streams can be mixed and / or twisted.
  • the extrusion head can be rotated in solidarity with the mixing insert.
  • the present invention also relates to a device for producing foam composite bodies with at least two extruders which are connected to an extruder die and each feed a foamable polymer melt stream into the extruder die, the polymer melt streams having different physical and / or chemical properties.
  • the device according to the invention is characterized in that the extruder tool comprises a mixing insert which can be rotated about its own axis and which at least partially mixes and / or rotates the polymer melt streams.
  • the mixing insert preferably comprises a rotationally symmetrical mixer which is mounted in a rotatable housing. Due to the large number of different shapes that are possible for the rotationally symmetrical mixer, the patterns in the foam composite bodies produced can be fundamentally changed by simply exchanging the rotationally symmetrical mixing insert. The device can therefore be used for a whole range of different products.
  • the mixing element is connected to an axial channel which leads a polymer melt stream into the rotationally symmetrical mixer, while a second polymer melt stream is conducted outside the channel to the mixing element.
  • the polymer melt streams are therefore only brought together in the mixing element.
  • one of the polymer melt streams is mixed by a rotationally symmetrical mixer in a certain pattern among the polymer melt stream flowing outside the channel.
  • the polymer melt streams can also be upstream of the mixing element in a first section of the extruder die bring together and thus mix several polymer melt streams together.
  • a screw as a rotationally symmetrical mixer which rotates the various polymer melt streams with one another and / or at least partially mixes them.
  • the extruder tool comprises an extrusion head which can be rotated in solidarity with the mixing insert, the extrusion head being positively and non-positively connected to the mixing insert of the extruder tool.
  • the mixing insert can be rotated in both directions about its own axis by a motor via a friction gear.
  • the mixing insert attached in at least one of the polymer melt streams is rotated about 1 to 100 revolutions per minute around its own axis either in one direction or in the other direction, the speed of rotation of the mixing insert being infinitely variable.
  • the present invention also relates to a foam composite with any pattern in its mass, which comprises at least two foamable polymer melts with different physical and / or chemical properties.
  • the polymer melt streams are firmly welded together over the entire contact area. .
  • the blowing agent used for direct gassing is preferably i-butane, n-butane, propane, pentane, i-pentane, C0 2 , N 2 , F142b (difluoro-mono-chloroethane), F22 (difluoro-mono-chloromethane), F134 (tetrafluoro-ethane) or mixtures thereof.
  • the same blowing agent is preferably used for the direct gassing of the individual foamable polymer melt streams to be combined, in such quantities that the foam compound body is inserted
  • the foam composite according to the invention preferably consists of one or more of the polymers from the group consisting of LDPE, (low density polyethylene), LLDPE (linear low density polyethylene), HDPE (high density polyethylene), PP (polypropylene), PVC (polyvinyl chloride), PS (polystyrene), SAN (styrene acrylonitrile), EVA (ethylene vinyl acetate), and EAA (ethylene ethyl acetate).
  • the foam composite bodies have strands which are firmly connected to one another and have different polymers, colors, bulk densities and / or temperature resistance.
  • Fillers can influence the mechanical and electrostatic properties of the foam composite.
  • FIG. 2 shows a section through the extruder die of a first exemplary embodiment of a device for producing foam composite bodies
  • 3 shows a section through the extruder tool of a further preferred embodiment of a device for producing foam composite bodies; 4: a section through the extruder die of a further preferred embodiment of a device for producing foam composite bodies;
  • 5a-15a are examples of multi-colored foam composites in accordance with the present invention.
  • FIGS. 4a-14a show sections through FIGS. 4a-14a.
  • 16a-19 are examples of dynamic mixers that can be used in the illustrated foam composite apparatus shown in FIG. 3.
  • 15b-17b show sections through FIGS. 15a-17a.
  • FIG. 1 shows an overall view of a preferred embodiment of a device for producing foam composite bodies. It comprises three extruders 10, 12, 14 ⁇ XE “10, 12, 14 three extruders” ⁇ which are inserted into an extruder tool 16, ⁇ XE “16 extruder tool” ⁇ with an extrusion head 18 ⁇ XE “18 extrusion head” ⁇ and one Motor 20 ⁇ XE “20 Motor” ⁇ is equipped, open. The motor 20 is controlled by an external computer 22 ⁇ XE "22 computer” ⁇ .
  • FIG. 2 shows a partial section through the extruder tool 16 of a first exemplary embodiment of an apparatus for producing foam composite bodies.
  • the extruder tool 16 consists of several sections lying one behind the other, the polymer melt streams flowing together in the first section 24 ⁇ XE "24 first section” ⁇ , being twisted and / or at least partially mixed in the second section 26 ⁇ XE "26 second section” ⁇ and are extruded in the third section 28 ⁇ XE "28 third section” ⁇ .
  • Sections 24 and 28 are equipped with heating tapes 30 ⁇ XE "30 heating tapes” ⁇ and temperature probes 32 ⁇ XE "32 temperature probes” ⁇ to ensure that the polymer melts can be kept at the optimum temperature during the entire process.
  • the polymer melts of the extruders 10, 12, 14 are in the first
  • Section 24 of the extruder tool 16 merged, the connections of the extruders 10 and 14 each being provided with a shut-off valve 34 ⁇ XE "34 shut-off valve” ⁇ which allow the polymer melt streams from the two extruders 10, 14 to be interrupted.
  • this device can be used for the extrusion of foam bodies which consist of one, two or three different polymer melts, without the entire apparatus therefore having to be dismantled or converted.
  • this section 26 contains a mixing insert 36 ⁇ XE "36 mixing insert” ⁇ which comprises a housing 38 ⁇ XE "38 housing” ⁇ in which an elongated rotationally symmetrical mixer is attached.
  • the elongated rotationally symmetrical mixer is designed as a screw 40 ⁇ XE "40 screw” ⁇ , which is sealed against the inner housing 38.
  • the polymer melt streams are twisted into one another by rotations of the mixing insert 36 and / or at least partially mixed with one another
  • the inner housing 38 is rotated about its longitudinal axis by the motor 20 by means of a pulley 42 ⁇ XE "42 pulley” ⁇ .
  • the rotation of the inner housing 38 rotates the screw 40, which is in solidarity with the inner housing 38, about its own axis within the polymer melt streams, so that the polymer melt streams are mixed with one another and / or twisted into one another.
  • the motor 20 can be controlled by a computer 22 and the mixing insert 36 can thus be rotated about its longitudinal axis in both directions, any number of patterns can be produced and varied as desired during production. For this purpose, the speed of rotation and / or the direction of rotation of the mixing insert 36 changed.
  • the preferred rotational speed is between 1 and 100 revolutions per minute.
  • the forces of the motor 20 are transmitted from a friction wheel gear or roller bearing to the mixing insert 36.
  • the motor 20 is equipped with a drive pulley 44 ⁇ XE "44 drive pulley”> which transmits the movement to a pulley 42.
  • the movement of the pulley 42 is transmitted to the inner housing 38 and thus to the mixing insert 36 by means of a driven pulley 46 ⁇ XE "46 driven pulley” ⁇ which is in solidarity with the inner housing 38.
  • the friction wheel lifting device is particularly advantageous since it has a simple structure and thus allows an inexpensive construction, and at the same time can serve as an overload clutch.
  • the inner housing 38 is rotatably supported by a roller bearing 48 ⁇ XE "48 roller bearing” ⁇ in the second section 26 and sealed by seals 50 ⁇ XE "50 seals" ⁇ .
  • the twisted and / or mixed polymer melt streams are extruded through a conventional extrusion head 18 into a standard pressure atmosphere.
  • Foam composite pipes is essentially composed of a bolt 52 ⁇ XE "52 bolt” ⁇ arranged in the polymer melt stream and a tool disk 56 connected to the third section of the extruder tool 16 by centering screws 54 ⁇ XE “54 centering screws” ⁇ .
  • ⁇ XE "56 tool disk” The bolt 52 and the tool disk 56 form an extrusion nozzle through which the polymer melts are extruded, the polymer melts flowing around the bolt 52 and being delimited to the outside by the tool disk 56.
  • a compressed air supply 58 ⁇ XE "58 compressed air supply” ⁇ is attached which opens within the polymer melt stream.
  • the extruder die 16 in particular the extrusion head 18, is tempered uniformly and homogeneously. This is particularly important in the production of foam composite pipes, since in the extruder die 16 an additional bolt 52 is required which extends to the nozzle outlet and which must be tempered from the inside with compressed air. Make sure that the air is not too cold, otherwise the extrusion nozzle will freeze. In practice, good empirical values have been achieved with air temperatures that are approximately 50 ° C below the freezing temperatures of the polymer melts used. FIG.
  • composite foam pipes can be produced with two or more different polymer melts.
  • the polymer melt streams do not flow together before the mixing insert, but rather are led separately to the mixing insert.
  • the input of the first extruder 12 is connected to an axially arranged channel 60 ⁇ XE "60 channel” ⁇ which leads the polymer melt into the mixing insert 62 ⁇ XE "62 mixing insert” ⁇ .
  • the mixing insert 62 comprises an inner housing 64, ⁇ XE "64 inner housing” ⁇ in which an elongated rotationally symmetrical mixer 66 ⁇ XE “66 mixer” ⁇ is attached.
  • the elongated rotationally symmetrical mixer 66 is accommodated in an extension 68 ⁇ XE "68 extension” ⁇ of the channel 60, the transition between the channel 60 and the extension 68 using seals 70 ⁇ XE "70 seals" ⁇ radially outward is sealed.
  • the extension 68 of the channel 60 is connected to the rotatable housing by one or more webs 72 ⁇ XE "72 webs" ⁇ .
  • the housing 64, the extension 70 and the elongated rotationally symmetrical mixer 66 are accordingly rotatable with respect to the polymer melt flows which flow around the channel 60 on the outside.
  • the polymer melt streams are twisted into one another by rotations of the mixing insert 62 and / or at least partially mixed with one another.
  • the polymer melt from the extruder 12 is divided into different streams by the mixing insert 62 and among the polymer melt from the second extruder 14, which is outside the channel 60 flows in the direction of the extrusion head 18, mixed.
  • the mixing insert 62 is set in rotation by a computer-controlled motor 20 via a friction gear, so that foam composite bodies with different patterns, which are dependent on the speed of rotation and the direction of rotation, can be produced.
  • FIG. 4 shows a section through the extruder tool 16 of a further preferred embodiment of a device for producing foam composite bodies in which the extrusion head 18a can be rotated in solidarity with the mixing insert 62a.
  • the entrance of the first extruder 12 is arranged axially
  • the mixing insert 62a comprises an inner housing 64, ⁇ XE “64 inner housing” ⁇ in which an elongated rotationally symmetrical mixer 66 ⁇ XE “66 mixer” ⁇ is attached.
  • the elongated, rotationally symmetrical mixer 66 is accommodated in an extension 68 ⁇ XE "68 extension” ⁇ of the channel 60, the transition between the channel 60 and the extension 68 by means of seals 70 ⁇ XE "70 seals" ⁇ radially outward is sealed off.
  • the extension 68 of the channel 60 is connected to the rotatable housing by one or more webs 72 ⁇ XE "72 webs" ⁇ .
  • the housing 64, the extension 70 and the elongated rotationally symmetrical mixer 66 are accordingly rotatable with respect to the polymer melt flows which flow around the channel 60 on the outside.
  • the extrusion head 18a is rotatably mounted within the housing 28a and is positively and non-positively connected to the mixing insert 62a, whereby the extrusion head 18a is rotatable about its axis together with the mixing insert 62a. Accordingly, the polymer melts are further rotated about their own axis after exiting the mixing insert 62a until they leave the extrusion die through the extrusion head 18a. This rotation of the mixed polymer melt streams about its own axis prevents the patterns formed in the polymer melt streams from being blurred or damaged by the friction between the inner walls of the extrusion die and the polymer melt streams.
  • the mixing insert 62a is set in rotation by a computer-controlled motor 20 via a friction gear, so that foam composites with different patterns, which are dependent on the speed of rotation and the direction of rotation, can be produced.
  • 5a-15a are examples of multi-colored foam composites in accordance with the present invention.
  • FIGS. 5a-15b show sections through FIGS. 5a-15a.
  • FIGS. 5-11 were produced with the extruder according to FIG. 3, with FIGS. 5-8 having round products with a wavy pattern.
  • 9a and 9b show a composite foam pipe
  • FIGS. 10a and 10b show a flat product with a wave pattern.
  • more complex shapes such as 11, are produced.
  • FIGS. 12-15 were produced with an extruder according to FIG. 2. All of these examples show only a limited selection from one
  • FIGS. 16a-18a show sections through FIGS. 16a-18a.
  • Figures 16a and 16b show one on both sides
  • FIGS. 16a and 16b Cylinder with peripheral recesses and central holes.
  • a rotationally symmetrical mixer with a star-shaped cross section is shown in FIGS. 16a and 16b.
  • FIGS. 18a and 18b show a cylinder-shaped mixer with an inner lattice structure
  • FIG. 19 shows a mixer with a cylindrical section which has reef-shaped surface depressions.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

A process and device for producing co-extruded foam composites having any patterns in their mass. The foam composites are taken together from at least two foamable polymer melt streams with different physical and/or chemical properties to an extruding tool after the application of a gas, at least partially mixed and/or twisted and then co-extruded.

Description

VERFAHRENUNDVORRICHTUNGZURHERSTELLUNGVON COEXTRUDIERTENSCHAUMSTOFFVERBUNPKÖRPERN METHOD AND DEVICE FOR PRODUCING COEXTRUDED FOAM COMPOUND BODIES
Die vorliegende Erfindung betrifft ein Verfahren und eine Vorrichtung zur Herstellung von coextrudierten Schaumstoffverbundkörpern Aus der deutschen Offenleguπgsschrift DE-OS 4 316 863 ist einThe present invention relates to a method and a device for producing coextruded foam composite bodies. German Offenlegungsschrift DE-OS 4 316 863 describes a
Schaumstoffverbundkörper bekannt, der aus mindestens zwei unterschied¬ lichen Polymerschmelzen hergestellt wird, wobei die einzelnen parallelen oder konzentrischen Schichten der verschäumten Polymerschmelzen im Endprodukt scharf voneinander getrennt und trotzdem an ihren Berüh- rungsflächen fest miteinander verbunden sind. Um ein Vermischen der verschäumbaren Polymerschmelzen zu verhindern und um trotzdem eine feste Verbindung zwischen den Schichten des Schaumstoffverbundkörpers zu gewährleisten, werden die Polymerschmelzen im Extruderwerkzeug bereits in einem empirisch festgelegten Abstand vor dem Düsenaustritt, ohne Vermischung, in Verbindung miteinander gebracht.Foam composite body is known, which is produced from at least two different polymer melts, the individual parallel or concentric layers of the foamed polymer melts in the end product being sharply separated from one another and nevertheless firmly connected to one another at their contact surfaces. In order to prevent mixing of the foamable polymer melts and still to ensure a firm connection between the layers of the foam composite body, the polymer melts are brought into connection with one another at an empirically determined distance before the nozzle outlet, without mixing, in the extruder die.
Die US Patentschrift US 5,190,706 beschreibt eine Vorrichtung zur Herstellung von Schaumstoffverbundkörpern, wobei zwei Polymerschmelz¬ ströme in einem Extruderwerkzeug zusammengebracht werden und wobei einer der beiden Polymerschmelzströme durch eine Öffnung im Extruder- Werkzeug auf die Oberfläche des zweiten Polymerschmelzstromes aufgetra¬ gen wird. Diese Öffnung kann eine Düse enthalten, wodurch der erste Polymerschmeizstrom in einem bestimmten Muster auf die Oberfläche des zweiten Polymerschmelzstromes aufgebracht wird. Hierbei kann jedoch nur eine sehr begrenzte Zahl von Mustern, auf der Oberfläche, des zweiten Polymerschmelzstromes hergestellt werden.US Pat. No. 5,190,706 describes a device for the production of foam composite bodies, two polymer melt streams being brought together in an extruder die and one of the two polymer melt streams being applied to the surface of the second polymer melt stream through an opening in the extruder die. This opening can contain a nozzle, whereby the first polymer melt stream is applied in a certain pattern to the surface of the second polymer melt stream. However, only a very limited number of patterns can be produced on the surface of the second polymer melt stream.
Aufgabe der vorliegenden Erfindung ist es daher ein Verfahren zur Herstellung von Schaumstoffverbundkörpern zur Verfügung zu stellen wodurch mindestens zwei Polymerschmelzen zu beliebigen Mustern in der Masse eines Schaumstoffverbundkörpers verarbeitet werden können. Gelöst wird diese Aufgabe gemäß der vorliegenden Erfindung durch ein Verfahren zum Herstellen von Schaumstoffverbundkörpem wobei mindestens zwei verschäumbare Polymerschmelzströme mit unterschied¬ lichen physikalischen und/oder chemischen Eigenschaften nach Begasung in einem Extruderwerkzeug zusammengeführt werden. Das erfindungs¬ gemäße Verfahren ist dadurch gekennzeichnet, daß die Polymerschmelz¬ ströme zumindest teilweise gemischt und/oder verdreht und anschließend coextrudiert werden, so daß beliebige Muster in der Masse der Schaumstoff¬ verbundkorper entstehen. In diesem Verfahren werden nur die Polymerschmelzströme zumindest teilweise gemischt und/oder verdreht, nicht aber die Polymerschmelzen an sich. Eine homogene Vermischung der Polymerschmelzen wird nicht angestrebt, die Grenzen zwischen den einzelnen Polymerschmelzströmen bleiben im fertigen Produkt scharf und deutlich sichtbar. Die Polymerschmelzströme sind über die gesamte Berührungsfläche fest miteinander verschweißt.It is therefore an object of the present invention to provide a method for producing foam composite bodies, as a result of which at least two polymer melts can be processed into any desired pattern in the mass of a foam composite body. According to the present invention, this object is achieved by a method for producing foam composite bodies, wherein at least two foamable polymer melt streams having different physical and / or chemical properties are brought together in an extruder die after gassing. The method according to the invention is characterized in that the polymer melt streams are at least partially mixed and / or twisted and then coextruded, so that any pattern is formed in the mass of the foam composite body. In this process, only the polymer melt streams are at least partially mixed and / or twisted, but not the polymer melts themselves. Homogeneous mixing of the polymer melts is not sought, the boundaries between the individual polymer melt streams remain sharp and clearly visible in the finished product. The polymer melt streams are firmly welded together over the entire contact area.
Dieses Verfahren ermöglicht es z.B. Schaumstoffverbundkorper her¬ zustellen die wegen der Mischung und/oder Verdrehung der einzelnen Polymerschmelzströme beliebige Muster in ihrer Masse aufweisen. Bei den bisher bekannten Verfahren ist es nur möglich entweder Schaumstoffver¬ bundkorper herzustellen die an ihrer Oberfläche zweifarbige Muster auf¬ wiesen oder aber aus mehreren verschiedenen, parallelen oder konzen¬ trischen, Schichten bestehen.This method enables e.g. Manufacture foam composite bodies which, because of the mixing and / or twisting of the individual polymer melt streams, have any pattern in their mass. In the previously known methods, it is only possible to either produce foam composite bodies which have two-colored patterns on their surface or else to consist of several different, parallel or concentric layers.
Das erfindungsgemäße Verfahren ist wenig störanfällig. Es erlaubt Schaumstoffverbundkorper einfach und preiswert herzustellen.The method according to the invention is not very susceptible to faults. It allows foam composites to be manufactured easily and inexpensively.
Die Schaumstoffverbundkorper der vorliegenden Erfindung können nicht nur zu Dekorationszwecken eingesetzt werden, sondern es können auch Schaumstoffverbundkorper mit neuen physikalischen und/oder chemischen Eigenschaften erzeugt werden. Dafür werden Polymerschmelz- ströme mit unterschiedlichen Eigenschaften miteinander gemischt. Je nach Art und Intensität der Vermischung ist es möglich die Eigenschaften des Schaumstoffverbundkorper die nach diesem Verfahren hergestellt sind, auf die jeweiligen Bedürfnisse maßzuschneidern.The foam composite bodies of the present invention can not only be used for decorative purposes, but also foam composite bodies with new physical and / or chemical properties can be produced. For this purpose, polymer melt streams with different properties are mixed together. Depending on The type and intensity of the mixing makes it possible to tailor the properties of the foam composite that are produced by this process to the respective requirements.
Durch dieses Verfahren hergestellte Schaumstoffverbundkorper könrreπ eingesetzt werden, um Produkte in untersrh.ecttrctτeττ FdiLTi nustem zu kennzeichnen, wie das heute z.B. bei elektrischen Kabeln der Fall ist.Foam composites produced by this process can be used to mark products in a different manner, as is the case today with e.g. is the case with electrical cables.
Die so hergestellten Schaumstoffverbundkorper können aber auch in der Verpackungs- oder in der Freizeitindustrie eingesetzt werden.The foam composite bodies thus produced can also be used in the packaging or in the leisure industry.
Gemäß einer ersten bevorzugten Ausführungsart werden die Polymerschmelzströme durch kontrolliertes Drehen eines in mindestens zwei der Polymerschmelzströme angebrachten Mischeinsatzes gemischt und/oder ineinander verdreht und anschließend durch einen Extrusionskopf coextrudiert.According to a first preferred embodiment, the polymer melt streams are mixed and / or twisted into one another by controlled rotation of a mixing insert fitted in at least two of the polymer melt streams and then coextruded through an extrusion head.
In vorteilhafter Weise wird der in mindestens zwei der Polymer- schmelzströme angebrachte Mischeinsatz mit zwischen 1 und 100 Umdre¬ hungen pro Minute um die eigene Achse gedreht. Die Umdrehungsge¬ schwindigkeit des Mischeinsatzes ist am besten stufenlos regelbar und der Mischeinsatz soll in beide Richtungen, um seine eigne Längsachse drehbar sein. Durch den drehbaren Mischeinsatz kann man eine fast unbegrenzteAdvantageously, the mixing insert applied in at least two of the polymer melt streams is rotated about its own axis at between 1 and 100 revolutions per minute. The speed of rotation of the mixing insert is best infinitely variable and the mixing insert should be rotatable in both directions about its own longitudinal axis. Due to the rotating mixing insert, you can create an almost unlimited
Anzahl von verschiedenen Mustern herstellen und diese während der Produktion zu jeder Zeit verändern, ohne daß dafür ein Umbau der Produk¬ tionsanlagen nötig wäre.Produce a number of different samples and change them at any time during production without the production plants having to be converted.
Man kann die Polymerschmelzströme stromaufwärts vor dem Misch- einsatz zusammenbringen und dann durch den Mischeinsatz führen. Dies erlaubt es viele verschiedene Polymerschmelzströme miteinander zu ver¬ mischen und/oder zu verdrehen.The polymer melt streams can be brought together upstream of the mixing insert and then passed through the mixing insert. This makes it possible to mix and / or twist many different polymer melt streams with one another.
Man kann aber auch die Polymerschmelzströme getrennt bis zum Mischeinsatz führen und erst innerhalb des Mischeinsatzes zusammen- bringen. In diesem Fall kann man jedoch normalerweise nur zwei Polymer¬ schmelzströme vermischen und/oder verdrehen.However, the polymer melt streams can also be conducted separately to the mixing insert and only combined within the mixing insert. bring. In this case, however, normally only two polymer melt streams can be mixed and / or twisted.
Gemäß einer weiteren vorteilhaften Ausführung ist der Extrusionskopf solidarisch mit dem Mischeinsatz drehbar. Die vorliegende Erfindung betrifft auch eine Vorrichtung zur Herstellung von Schaumstoffverbundkorper mit mindestens zwei Extrudern, die an ein Extruderwerkzeug angeschlossen sind und je einen verschäumbaren Poly¬ merschmeizstrom in das Extruderwerkzeug einspeisen, wobei die Polymerschmelzströme unterschiedliche physikalische und/oder chemische Eigenschaften aufweisen. Die erfindungsgemäße Vorrichtung ist dadurch gekennzeichnet, daß das Extruderwerkzeug einen, um die eigene Achse drehbaren Mischeinsatz umfaßt, der die Polymerschmelzströme zumindest teilweise mischt und/oder verdreht.According to a further advantageous embodiment, the extrusion head can be rotated in solidarity with the mixing insert. The present invention also relates to a device for producing foam composite bodies with at least two extruders which are connected to an extruder die and each feed a foamable polymer melt stream into the extruder die, the polymer melt streams having different physical and / or chemical properties. The device according to the invention is characterized in that the extruder tool comprises a mixing insert which can be rotated about its own axis and which at least partially mixes and / or rotates the polymer melt streams.
Vorzugsweise umfaßt der Mischeinsatz einen rotationssymetrischen Mischer der in einem drehbaren Gehäuse angebracht ist. Durch die große Zahl von verschiedenen, in Frage kommenden Formen für den rotations¬ symetrischen Mischer kann man die Muster in den erzeugten Schaumstoff¬ verbundkörpern grundlegend verändern, indem man einfach nur den rotationssymetrischen Mischeinsatz austauscht. Die Vorrichtung kann man demgemäß für eine ganze Reihe verschiedener Produkte einsetzen.The mixing insert preferably comprises a rotationally symmetrical mixer which is mounted in a rotatable housing. Due to the large number of different shapes that are possible for the rotationally symmetrical mixer, the patterns in the foam composite bodies produced can be fundamentally changed by simply exchanging the rotationally symmetrical mixing insert. The device can therefore be used for a whole range of different products.
Gemäß einer bevorzugten Ausführung ist das Mischelement mit einem axialen Kanal verbunden, der einen Polymerschmeizstrom in den rotations¬ symetrischen Mischer führt, während ein zweiter Polymerschmeizstrom außen am Kanal bis zum Mischelement geführt wird. Die Polymerschmelz- ströme werden demgemäß erst im Mischelement zusammengebracht. In einem solchen Fall wird einer der Polymerschmelzströme durch einen rotationssymetrischen Mischer in einem bestimmten Muster unter den außen am Kanal vorbei fließenden Polymerschmeizstrom gemischt.According to a preferred embodiment, the mixing element is connected to an axial channel which leads a polymer melt stream into the rotationally symmetrical mixer, while a second polymer melt stream is conducted outside the channel to the mixing element. The polymer melt streams are therefore only brought together in the mixing element. In such a case, one of the polymer melt streams is mixed by a rotationally symmetrical mixer in a certain pattern among the polymer melt stream flowing outside the channel.
Man kann jedoch auch die Polymerschmelzströme stromaufwärts, vor dem Mischelement in einem ersten Abschnitt des Extruderwerkzeugs zusammenbringen und so mehrere Polymerschmelzströme miteinander vermischen.However, the polymer melt streams can also be upstream of the mixing element in a first section of the extruder die bring together and thus mix several polymer melt streams together.
In einem solchen Fall ist es vorteilhaft, als rotationssymetrischen Mischer, eine Schnecke zu benutzen, die die verschiedenen Polymer- schmelzströme miteinander verdreht und/oder zu mindestens teilweise vermischt.In such a case, it is advantageous to use a screw as a rotationally symmetrical mixer which rotates the various polymer melt streams with one another and / or at least partially mixes them.
Vorzugsweise umfaßt das Extruderwerkzeug einen Extrusionskopf der solidarisch mit dem Mischeinsatz drehbar ist, wobei der Extrusionskopf form- und kraftschlüßig mit dem Mischeinsatz des Extruderwerkzeuges verbunden ist.Preferably, the extruder tool comprises an extrusion head which can be rotated in solidarity with the mixing insert, the extrusion head being positively and non-positively connected to the mixing insert of the extruder tool.
Gemäß einer weiteren bevorzugten Ausführung ist der Mischeinsatz über ein Reibradgetriebe durch einen Motor um die eigene Achse in beide Richtungen drehbar. In vorteilhafter Weise wird der in mindestens einem der Polymerschmelzströme angebrachte Mischeinsatz mit zwischen 1 und 100 Umdrehungen pro Minute um die eigene Achse entweder in eine oder die andere Richtung gedreht wobei die Umdrehungsgeschwindigkeit des Mischeinsatzes stufenlos regelbar ist.According to a further preferred embodiment, the mixing insert can be rotated in both directions about its own axis by a motor via a friction gear. Advantageously, the mixing insert attached in at least one of the polymer melt streams is rotated about 1 to 100 revolutions per minute around its own axis either in one direction or in the other direction, the speed of rotation of the mixing insert being infinitely variable.
Um die Vorrichtung optimal auszunutzen, ist es vorteilhaft den Motor durch einen Rechner zu steuern und so den Mischeinsatz nach einer vorpro- grammierten und beliebig oft wiederholbaren Weise anzutreiben.In order to make optimum use of the device, it is advantageous to control the motor by means of a computer and thus to drive the mixing operation in a pre-programmed and repeatable manner as often as desired.
Die vorliegende Erfindung betrifft auch einen Schaumstoffverbund¬ korper mit beliebigen Mustern in seiner Masse, der mindestens zwei ver- schäumbaren Polymerschmelzen mit unterschiedlichen physikalischen und/oder chemischen Eigenschaften umfaßt. Die Polymerschmelzströme sind über die gesamte Berührungsfläche fest miteinander verschweißt. .The present invention also relates to a foam composite with any pattern in its mass, which comprises at least two foamable polymer melts with different physical and / or chemical properties. The polymer melt streams are firmly welded together over the entire contact area. .
Als Treibmittel zur Direktbegasung setzt man gemäß der vorliegenden Erfindung vorzugsweise i-Butan, n-Butan, Propan, Pentan, i-Pentan, C02, N2, F142b (Difluor-mono-chlor-ethan), F22 (difluor-mono-chloromethan), F134 (Tetrafluor-ethan) oder Mischungen davon ein.According to the present invention, the blowing agent used for direct gassing is preferably i-butane, n-butane, propane, pentane, i-pentane, C0 2 , N 2 , F142b (difluoro-mono-chloroethane), F22 (difluoro-mono-chloromethane), F134 (tetrafluoro-ethane) or mixtures thereof.
Vorzugsweise wird das gleiche Treibmittel zur Direktbegasung der einzelnen zu vereinenden verschäumbaren Polymerschmelzströme einge- setzt und zwar in solchen Mengen, daß der Schaυmstcffverbuπeikörper einThe same blowing agent is preferably used for the direct gassing of the individual foamable polymer melt streams to be combined, in such quantities that the foam compound body is inserted
Raumgewicht unterhalb von 100 kg/m3, vorzugsweise unterhalb von 50 kg/m3 aufweist.Has a density of less than 100 kg / m 3 , preferably less than 50 kg / m 3 .
Der erfindungsgemäße Schaumstoffverbundkorper besteht vorzugs¬ weise aus einem oder mehreren der Polymere aus der Gruppe von LDPE, (Low Density Polyethylen), LLDPE (Linear Low Density Polyethylen), HDPE (High Density Polyethylen), PP (Polypropylen), PVC (Polyvinylchlorid), PS (Polystyrol), SAN (Styrol Acrylnitril), EVA (Ethylen Vinyl Acetat), und EAA (Ethylen Ethyl Acetat). Die Schaumstoffverbundkorper weisen dabei fest miteinander verbundene Stränge mit unterschiedlichen Polymeren, Farben, Rohdichten, und/oder Temperaturbeständigkeiten auf.The foam composite according to the invention preferably consists of one or more of the polymers from the group consisting of LDPE, (low density polyethylene), LLDPE (linear low density polyethylene), HDPE (high density polyethylene), PP (polypropylene), PVC (polyvinyl chloride), PS (polystyrene), SAN (styrene acrylonitrile), EVA (ethylene vinyl acetate), and EAA (ethylene ethyl acetate). The foam composite bodies have strands which are firmly connected to one another and have different polymers, colors, bulk densities and / or temperature resistance.
Durch Füllstoffe können die mechanischen sowie die elektrostatischen Eigenschaften der Schaumstoffverbundkorper beeinflußt werden.Fillers can influence the mechanical and electrostatic properties of the foam composite.
Im folgenden werden verschiedene bevorzugte Ausführungsallen der erfindungsgemäßen Vorrichtung anhand der Figuren beschrieben. Es zeigen:Various preferred embodiments of the device according to the invention are described below with reference to the figures. Show it:
Fig.1 : eine Gesamtansicht einer Vorrichtung zum Herstellen von Schaumstoffverbundkörpern,1: an overall view of a device for producing foam composite bodies,
Fig.2 : einen Schnitt durch das Extruderwerkzeug eines ersten Ausfüh¬ rungsbeispieles einer Vorrichtung zum Herstellen von Schaumstoffverbund- körpern;2 shows a section through the extruder die of a first exemplary embodiment of a device for producing foam composite bodies;
Fig.3 :einen Schnitt durch das Extruderwerkzeug einer weiteren bevor¬ zugten Ausführungsart einer Vorrichtung zum Herstellen von Schaumstoff¬ verbundkörpern; Fig.4 : einen Schnitt durch das Extruderwerkzeug einer weiteren bevor¬ zugten Ausführungsart einer Vorrichtung zum Herstellen von Schaumstoff¬ verbundkörpern;3 shows a section through the extruder tool of a further preferred embodiment of a device for producing foam composite bodies; 4: a section through the extruder die of a further preferred embodiment of a device for producing foam composite bodies;
Fig. 5a-15a sind Beispiele für mehrfarbige Schaumstoffverbundkorper gemäß der vorliegenden Erfindung;5a-15a are examples of multi-colored foam composites in accordance with the present invention;
Fig. 5b-15b zeigen Schnitte durch die Fig. 4a-14a.5b-15b show sections through FIGS. 4a-14a.
Fig. 16a-19 sind Beispiele von dynamischen Mischern, die in den dargestellten Vorrichtungen zum Herstellen von Schaumstoffverbundkorper nach Fig. 3 verwendet werden können. Fig. 15b-17b zeigen Schnitte durch Fig. 15a-17a.16a-19 are examples of dynamic mixers that can be used in the illustrated foam composite apparatus shown in FIG. 3. 15b-17b show sections through FIGS. 15a-17a.
Fig. 20 und 21 zeigen Schnitte durch mehrfarbige Schaumstoff¬ verbundkorper die mit einem Mischeinsatz gemäß Fig. 4 hergestellt wurden.20 and 21 show sections through multi-colored foam composite bodies which were produced with a mixing insert according to FIG. 4.
Fig. 1 zeigt eine Gesamtansicht einer bevorzugten Ausführung einer Vorrichtung zur Herstellung von Schaumstoffverbundkörpern. Sie umfaßt drei Extruder 10, 12, 14{ XE "10,12,14 drei Extruder" } die in ein Extruder¬ werkzeug 16, { XE "16 Extruderwerkzeug" } das mit einem Extrusionskopf 18{ XE "18 Extrusionskopf" } und einem Motor 20{ XE "20 Motor" } ausge¬ rüstet ist, einmünden. Der Motor 20 wird durch einen externen Rechner 22{ XE "22 Rechner" } gesteuert. Fig. 2 zeigt einen Teilschnitt durch das Extruderwerkzeug 16 eines erstes Ausführungsbeispiels einer Vorrichtung zur Herstellung von Schaumstoffverbundkörpern.1 shows an overall view of a preferred embodiment of a device for producing foam composite bodies. It comprises three extruders 10, 12, 14 {XE "10, 12, 14 three extruders"} which are inserted into an extruder tool 16, {XE "16 extruder tool"} with an extrusion head 18 {XE "18 extrusion head"} and one Motor 20 {XE "20 Motor"} is equipped, open. The motor 20 is controlled by an external computer 22 {XE "22 computer"}. FIG. 2 shows a partial section through the extruder tool 16 of a first exemplary embodiment of an apparatus for producing foam composite bodies.
Das Extruderwerkzeug 16 besteht aus mehreren hintereinander liegenden Abschnitten, wobei die Polymerschmelzströme in dem ersten Abschnitt 24{ XE "24 erster Abschnitt" } zusammenfließen, in dem zweiten Abschnitt 26{ XE "26 zweiter Abschnitt" } verdreht und/oder zumindest teilweise vermischt werden und in dem dritten Abschnitt 28{ XE "28 dritter Abschnitt" } extrudiert werden. Die Abschnitte 24 und 28 sind mit Heizbändern 30{ XE "30 Heizbän¬ dern" } und Temperatursonden 32{ XE "32 Temperatursonden" } ausgerüstet um zu gewährleisten, daß die Polymerschmelzen während des ganzen Vorganges auf der optimalen Temperatur gehalten werden können. Die Polymerschmelzen der Extruder 10, 12 ,14 werden in dem erstenThe extruder tool 16 consists of several sections lying one behind the other, the polymer melt streams flowing together in the first section 24 {XE "24 first section"}, being twisted and / or at least partially mixed in the second section 26 {XE "26 second section"} and are extruded in the third section 28 {XE "28 third section"}. Sections 24 and 28 are equipped with heating tapes 30 {XE "30 heating tapes"} and temperature probes 32 {XE "32 temperature probes"} to ensure that the polymer melts can be kept at the optimum temperature during the entire process. The polymer melts of the extruders 10, 12, 14 are in the first
Abschnitt 24 des Extruderwerkzeugs 16 zusammengeführt, wobei die Anschlüsse der Extruder 10 und 14 mit je einem Absperrhahn 34{ XE "34 Absperrhahn" } versehenen sind die es erlauben die Polymerschmelzströme aus den beiden Extrudern 10, 14 zu unterbrechen. Hierdurch kann man diese Vorrichtung zur Extrusion von Schaumstoffkörpern nutzen die aus einer, zwei oder drei verschiedenen Polymerschmelzen bestehen, ohne daß deshalb die ganze Apparatur ab- oder umgebaut werden muß.Section 24 of the extruder tool 16 merged, the connections of the extruders 10 and 14 each being provided with a shut-off valve 34 {XE "34 shut-off valve"} which allow the polymer melt streams from the two extruders 10, 14 to be interrupted. As a result, this device can be used for the extrusion of foam bodies which consist of one, two or three different polymer melts, without the entire apparatus therefore having to be dismantled or converted.
Im zweiten Abschnitt 26 des Extruderwerkzeugs 16 werden die Poly¬ merschmelzströme miteinander vermischt bzw. ineinander verdreht. Zu diesem Zweck enthält dieser Abschnitt 26 einen Mischeinsatz 36 { XE "36 Mischeinsatz" } der ein Gehäuse 38{ XE "38 Gehäuse" } umfaßt in dem ein länglicher rotationssymetrischer Mischer angebracht ist. In diesem Fall ist der längliche rotationssymetrische Mischer als Schnecke 40 { XE "40 Schnecke" } ausgebildet, die gegen das innere Gehäuse 38 abgedichtet ist. Die Polymerschmelzströme werden durch Drehungen des Mischeinsatzes 36 ineinander verdreht und/oder zumindest teilweise miteinander vermischtIn the second section 26 of the extruder die 16, the polymer melt streams are mixed with one another or twisted into one another. For this purpose, this section 26 contains a mixing insert 36 {XE "36 mixing insert"} which comprises a housing 38 {XE "38 housing"} in which an elongated rotationally symmetrical mixer is attached. In this case, the elongated rotationally symmetrical mixer is designed as a screw 40 {XE "40 screw"}, which is sealed against the inner housing 38. The polymer melt streams are twisted into one another by rotations of the mixing insert 36 and / or at least partially mixed with one another
Das innere Gehäuse 38 wird durch den Motor 20 mittels einer Riemen¬ scheibe 42 { XE "42 Riemenscheibe" } um seine Längsachse gedreht. Durch die Rotation des inneren Gehäuses 38 wird die Schnecke 40, die mit dem inneren Gehäuse 38 solidarisch ist, innerhalb der Polymerschmelzströme um ihre eigne Achse gedreht, so daß die Polymerschmelzströme miteinander vermischt und/oder ineinander verdreht werden. Da der Motor 20 durch einen Rechner 22 steuerbar ist und der Mischeinsatz 36 dadurch in beiden Richtungen um seine Längsachse drehbar ist, kann man beliebig viele Muster herstellen und während der Produktion beliebig variieren. Zu diesem Zweck wird die Drehgeschwindigkeit und/oder die Drehrichtung des Misch- einsatzes 36 geändert. Die bevorzugte Drehgeschwindigkeit liegt zwischen 1 und 100 Umdrehungen pro Minute.The inner housing 38 is rotated about its longitudinal axis by the motor 20 by means of a pulley 42 {XE "42 pulley"}. The rotation of the inner housing 38 rotates the screw 40, which is in solidarity with the inner housing 38, about its own axis within the polymer melt streams, so that the polymer melt streams are mixed with one another and / or twisted into one another. Since the motor 20 can be controlled by a computer 22 and the mixing insert 36 can thus be rotated about its longitudinal axis in both directions, any number of patterns can be produced and varied as desired during production. For this purpose, the speed of rotation and / or the direction of rotation of the mixing insert 36 changed. The preferred rotational speed is between 1 and 100 revolutions per minute.
Die Kräfte des Motors 20 werden, in diesem Beispiel, von einem Reib¬ radgetriebe oder Wälzlager auf den Mischeinsatz 36 übertragen. Der Motor 20 ist mit einer Antriebsscheibe 44{ XE "44 Antriebsscheibe" > ausgerüstet, die die Bewegung auf eine Riemenscheibe 42 überträgt. Durch eine Abtrieb- scheibe 46{ XE "46 Abtriebscheibe" } die mit den inneren Gehäuse 38 solidarisch ist, wird die Bewegung der Riemenscheibe 42 auf das innere Gehäuse 38 und somit auf den Mischeinsatz 36 übertragen. Das Reibrad- gethebe ist in diesem Fall besonders vorteilhaft da es einfach im Aufbau und somit eine kostengünstige Konstruktion erlaubt und gleichzeitig als Über¬ lastungskupplung dienen kann.In this example, the forces of the motor 20 are transmitted from a friction wheel gear or roller bearing to the mixing insert 36. The motor 20 is equipped with a drive pulley 44 {XE "44 drive pulley"> which transmits the movement to a pulley 42. The movement of the pulley 42 is transmitted to the inner housing 38 and thus to the mixing insert 36 by means of a driven pulley 46 {XE "46 driven pulley"} which is in solidarity with the inner housing 38. In this case, the friction wheel lifting device is particularly advantageous since it has a simple structure and thus allows an inexpensive construction, and at the same time can serve as an overload clutch.
Das innere Gehäuse 38 ist durch ein Wälzlager 48{ XE "48 Wälzlager" } in dem zweiten Abschnitt 26 drehbar gelagert und durch Dichtungen 50{ XE "50 Dichtungen" } abgedichtet.The inner housing 38 is rotatably supported by a roller bearing 48 {XE "48 roller bearing"} in the second section 26 and sealed by seals 50 {XE "50 seals"}.
Nach dem Durchströmen der einzelnen Polymerschmelzen durch den Mischeinsatz 36, werden die verdrehten und/oder gemischten Polymer¬ schmelzströme durch einen herkömmlichen Extrusionskopf 18 in eine Normdruckatmosphäre extrudiert. Der Extrusionskopf 18, der in diesem Beispiel für die Herstellung vonAfter flowing through the individual polymer melts through the mixing insert 36, the twisted and / or mixed polymer melt streams are extruded through a conventional extrusion head 18 into a standard pressure atmosphere. The extrusion head 18 used in this example for the production of
Schaumstoffverbundrohren ausgelegt ist, besteht im wesentlichen aus einem in dem Polymerschmeizstrom angeordneten Bolzen 52{ XE "52 Bolzen" } und einer durch Zentrierschrauben 54{ XE "54 Zentrierschrauben" } mit dem dritten Abschnitt des Extruderwerkzeug 16 verbundenen Werkzeugscheibe 56. { XE "56 Werkzeugscheibe" } Der Bolzen 52 und die Werkzeugscheibe 56 bilden eine Extrusionsduse durch die die Polymerschmelzen extrudiert werden, wobei die Polymerschmelzen um den Bolzen 52 herumfließen und durch die Werkzeugscheibe 56 nach außen begrenzt werden.Foam composite pipes is essentially composed of a bolt 52 {XE "52 bolt"} arranged in the polymer melt stream and a tool disk 56 connected to the third section of the extruder tool 16 by centering screws 54 {XE "54 centering screws"}. {XE "56 tool disk "} The bolt 52 and the tool disk 56 form an extrusion nozzle through which the polymer melts are extruded, the polymer melts flowing around the bolt 52 and being delimited to the outside by the tool disk 56.
In dem Bolzen 52 ist eine Druckluftzufuhr 58{ XE "58 Druckluftzufuhr" } angebracht die innerhalb der Polymerschmelzstromes mündet. Bei der Durchführung des Verfahrens ist es wichtig, daß das Extruder¬ werkzeug 16, insbesondere der Extrusionskopf 18, gleichmäßig und homogen temperiert wird. Dies ist besonders wichtig bei der Herstellung von Schaumstoffverbundrohren, da im Extruderwerkzeug 16 zusätzlich ein Bolzen 52 benötigt wird, der sich bis zum Düsenaustritt erstreckt und der von innen mit Druckluft temperiert werden muß. Dabei ist darauf zu achten, daß die Luft nicht zu kalt ist, da sonst die Extrusionsduse einfriert. In der Praxis wurden gute Erfahrungswerte mit Lufttemperaturen erreicht, die etwa 50°C unter den Einfriertemperaturen der eingesetzten Polymerschmelzen liegen. Fig. 3 zeigt einen Schnitt durch das Extruderwerkzeug 16 einer anderen bevorzugten Ausführungsart einer Vorrichtung zum Herstellen von Schaumstoffverbundkörpern. In dieser besonderen Ausführungsart können Schaumstoffverbundrohre mit zwei oder mehreren verschiedenen Polymerschmelzen hergestellt werden. Anstatt wie bei der in Fig. 2 dargestellten Ausführungsart, fließen die Polymerschmelzströme nicht vor dem Mischeinsatz zusammen, sondern sie werden getrennt zu dem Mischeinsatz geführt.In the bolt 52 a compressed air supply 58 {XE "58 compressed air supply"} is attached which opens within the polymer melt stream. When carrying out the method, it is important that the extruder die 16, in particular the extrusion head 18, is tempered uniformly and homogeneously. This is particularly important in the production of foam composite pipes, since in the extruder die 16 an additional bolt 52 is required which extends to the nozzle outlet and which must be tempered from the inside with compressed air. Make sure that the air is not too cold, otherwise the extrusion nozzle will freeze. In practice, good empirical values have been achieved with air temperatures that are approximately 50 ° C below the freezing temperatures of the polymer melts used. FIG. 3 shows a section through the extruder tool 16 of another preferred embodiment of a device for producing foam composite bodies. In this particular embodiment, composite foam pipes can be produced with two or more different polymer melts. Instead of as in the embodiment shown in FIG. 2, the polymer melt streams do not flow together before the mixing insert, but rather are led separately to the mixing insert.
Der Eingang des ersten Extruders 12 ist mit einem axial angeordneten Kanal 60 { XE "60 Kanal"} verbunden, der die Polymerschmelze in den Mischeinsatz 62{ XE "62 Mischeinsatz" } führt. Der Mischeinsatz 62 umfaßt ein inneres Gehäuse 64, { XE "64 inneres Gehäuse" } in dem ein länglicher rotationssymetrischer Mischer 66{ XE "66 Mischer" } angebracht ist. In diesem Fall ist der längliche rotationssymetrische Mischer 66 in einer Verlängerung 68{ XE "68 Verlängerung" } des Kanals 60 untergebracht, wobei der Übergang zwischen dem Kanal 60 und der Verlängerung 68 mittels Dichtungen 70{ XE "70 Dichtungen" } radial nach außen hin abge¬ dichtet ist. Die Verlängerung 68 des Kanals 60 ist durch eine oder mehrere Stege 72{ XE "72 Stege" } mit dem drehbaren Gehäuse verbunden. Das Gehäuse 64, die Verlängerung 70 und der längliche rotationssymetrische Mischer 66 sind demgemäß gegenüber den Polymerschmelzströmen, die den Kanal 60 außen umfließen, drehbar. Die Polymerschmelzströme werden durch Drehungen des Mischein¬ satzes 62 ineinander verdreht und/oder zumindest teilweise miteinander vermischt Die Polymerschmelze aus dem Extruder 12 wird durch den Mischeinsatz 62 in verschiedene Ströme aufgeteilt und unter die Polymer- schmelze aus dem zweiten Extruder 14, die außerhalb des Kanals 60 in Richtung Extrusionskopf 18 fließt, gemischt. Auch in diesem Fall wird der Mischeinsatz 62 durch einen rechnergesteuerten Motor 20 über ein Reibrad¬ getriebe in Rotation versetzt, so daß Schaumstoffverbundkorper mit ver¬ schiedenen Muster, die abhängig von der Umdrehungsgeschwindigkeit und der Umdrehungsrichtung sind, erzeugt werden können.The input of the first extruder 12 is connected to an axially arranged channel 60 {XE "60 channel"} which leads the polymer melt into the mixing insert 62 {XE "62 mixing insert"}. The mixing insert 62 comprises an inner housing 64, {XE "64 inner housing"} in which an elongated rotationally symmetrical mixer 66 {XE "66 mixer"} is attached. In this case, the elongated rotationally symmetrical mixer 66 is accommodated in an extension 68 {XE "68 extension"} of the channel 60, the transition between the channel 60 and the extension 68 using seals 70 {XE "70 seals"} radially outward is sealed. The extension 68 of the channel 60 is connected to the rotatable housing by one or more webs 72 {XE "72 webs"}. The housing 64, the extension 70 and the elongated rotationally symmetrical mixer 66 are accordingly rotatable with respect to the polymer melt flows which flow around the channel 60 on the outside. The polymer melt streams are twisted into one another by rotations of the mixing insert 62 and / or at least partially mixed with one another. The polymer melt from the extruder 12 is divided into different streams by the mixing insert 62 and among the polymer melt from the second extruder 14, which is outside the channel 60 flows in the direction of the extrusion head 18, mixed. In this case too, the mixing insert 62 is set in rotation by a computer-controlled motor 20 via a friction gear, so that foam composite bodies with different patterns, which are dependent on the speed of rotation and the direction of rotation, can be produced.
Fig 4. zeigt einen Schnitt durch das Extruderwerkzeug 16 einer weiteren bevorzugten Ausführungsart einer Vorrichtung zum Herstellen von Schaumstoffverbundköφern in der der Extrusionskopf 18a solidarisch mit dem Mischeinsatz 62a drehbar ist. Der Eingang des ersten Extruders 12 ist mit einem axial angeordnetenFIG. 4 shows a section through the extruder tool 16 of a further preferred embodiment of a device for producing foam composite bodies in which the extrusion head 18a can be rotated in solidarity with the mixing insert 62a. The entrance of the first extruder 12 is arranged axially
Kanal 60 { XE "60 Kanal"} verbunden, der die Polymerschmelze in den Mischeinsatz 62a{ XE "62 Mischeinsatz" } führt. Der Mischeinsatz 62a umfaßt ein inneres Gehäuse 64, { XE "64 inneres Gehäuse" } in dem ein länglicher rotationssymetrischer Mischer 66{ XE "66 Mischer" } angebracht ist. Auch in diesem Fall ist der längliche rotationssymetrische Mischer 66 in einer Verlängerung 68{ XE "68 Verlängerung" } des Kanals 60 untergebracht, wobei der Übergang zwischen dem Kanal 60 und der Verlängerung 68 mittels Dichtungen 70{ XE "70 Dichtungen" } radial nach außen hin abgedichtet ist. Die Verlängerung 68 des Kanals 60 ist durch eine oder mehrere Stege 72{ XE "72 Stege" } mit dem drehbaren Gehäuse verbunden. Das Gehäuse 64, die Verlängerung 70 und der längliche rotationssymetrische Mischer 66 sind demgemäß gegenüber den Polymerschmelzströmen, die den Kanal 60 außen umfließen, drehbar.Channel 60 {XE "60 channel"} connected, which leads the polymer melt into the mixing insert 62a {XE "62 mixing insert"}. The mixing insert 62a comprises an inner housing 64, {XE "64 inner housing"} in which an elongated rotationally symmetrical mixer 66 {XE "66 mixer"} is attached. In this case too, the elongated, rotationally symmetrical mixer 66 is accommodated in an extension 68 {XE "68 extension"} of the channel 60, the transition between the channel 60 and the extension 68 by means of seals 70 {XE "70 seals"} radially outward is sealed off. The extension 68 of the channel 60 is connected to the rotatable housing by one or more webs 72 {XE "72 webs"}. The housing 64, the extension 70 and the elongated rotationally symmetrical mixer 66 are accordingly rotatable with respect to the polymer melt flows which flow around the channel 60 on the outside.
Der Extrusionskopf 18a ist innerhalb des Gehäuse 28a drehbar gelagert und form- und kraftschlüßig mit dem Mischeinsatz 62a verbunden, wodurch der Extrusionskopf 18a zusammen mit dem Mischeinsatz 62a um seine Achse drehbar ist. Die Polymerschmelzen werden demgemäß nach ihrem Austritt aus dem Mischeinsatz 62a weiter um ihre eigene Achse gedreht bis zum Zeitpunkt wo sie das Extrusionswerkzeug durch den Extrusionskopf 18a verlassen. Durch dieses um die eigene Achse drehen der gemischten Polymerschmelzströme wird verhindert, daß die gebildeten Muster in den Polymerschmelzströmen durch die Reibung zwischen den inneren Wänden des Extruderwerkzeuges und den Polymerschmelzströme verwischt oder beschädigt werden. Auch in diesem Fall wird der Mischeinsatz 62a durch einen rechnergesteuerten Motor 20 über ein Reibradgetriebe in Rotation versetzt, so daß Schaumstoffverbundkorper mit verschiedenen Muster, die abhängig von der Umdrehungsgeschwindigkeit und der Umdrehungsrichtung sind, erzeugt werden können. Fig. 5a-15a sind Beispiele für mehrfarbige Schaumstoffverbundkorper gemäß der vorliegenden Erfindung;The extrusion head 18a is rotatably mounted within the housing 28a and is positively and non-positively connected to the mixing insert 62a, whereby the extrusion head 18a is rotatable about its axis together with the mixing insert 62a. Accordingly, the polymer melts are further rotated about their own axis after exiting the mixing insert 62a until they leave the extrusion die through the extrusion head 18a. This rotation of the mixed polymer melt streams about its own axis prevents the patterns formed in the polymer melt streams from being blurred or damaged by the friction between the inner walls of the extrusion die and the polymer melt streams. In this case, too, the mixing insert 62a is set in rotation by a computer-controlled motor 20 via a friction gear, so that foam composites with different patterns, which are dependent on the speed of rotation and the direction of rotation, can be produced. 5a-15a are examples of multi-colored foam composites in accordance with the present invention;
Fig. 5b-15b zeigen Schnitte durch die Fig. 5a-15a.5b-15b show sections through FIGS. 5a-15a.
Die Produkte der Fig. 5-11 wurden mit dem Extruder nach Fig. 3 her¬ gestellt, wobei die Fig. 5-8 Rundprodukte mit wellenförmigen Muster auf- weisen. Die Fig. 9a und 9b zeigen ein Schaumstoffverbundrohr, während die Fig. 10a und 10b ein Flachprodukt mit Wellenmuster darstellt. Es können jedoch auch komplexere Formen wie z.B. nach Fig. 11 , hergestellt werden.The products of FIGS. 5-11 were produced with the extruder according to FIG. 3, with FIGS. 5-8 having round products with a wavy pattern. 9a and 9b show a composite foam pipe, while FIGS. 10a and 10b show a flat product with a wave pattern. However, more complex shapes such as 11, are produced.
Die Produkte der Fig. 12-15 wurden mit einem Extruder nach Fig 2 hergestellt. All diese Beispiele zeigen nur eine begrenzte Auswahl aus einerThe products of FIGS. 12-15 were produced with an extruder according to FIG. 2. All of these examples show only a limited selection from one
Vielzahl von verschiedenen Mustern und Formen, die mit dem beschriebenen Verfahren und Extruderwerkzeugen hergestellt werden können. Fig. 16a-19 sind Beispiele von Mischern, die in der dargestellten Vor¬ richtung zum Herstellen von Schaumstoffverbundkorper nach Fig. 3 verwendet werden können.Variety of different patterns and shapes that can be made with the described method and extrusion tools. 16a-19 are examples of mixers which can be used in the device shown for producing foam composite bodies according to FIG. 3.
Fig. 16b-18b zeigen Schnitte durch die Fig. 16a-18a. Die Figur 16a und 16b zeigen einen nach beiden Seiten 16b-18b show sections through FIGS. 16a-18a. Figures 16a and 16b show one on both sides
Zylinder mit peripheren Ausnehmungen und zentralen Bohrungen. Ein rotationssymetrischer Mischer mit sternförmigen Querschnitt ist auf den Fig. 16a und 16b dargestellt.Cylinder with peripheral recesses and central holes. A rotationally symmetrical mixer with a star-shaped cross section is shown in FIGS. 16a and 16b.
Fig. 18a und 18b zeigen einen zyiinderförmigen Mischer mit einer inneren Gitterstruktur, während Fig. 19 einen Mischer mit einem zylindrischen Teilstück das riffeiförmige Oberflächenvertiefungen aufweist, darstellt.FIGS. 18a and 18b show a cylinder-shaped mixer with an inner lattice structure, while FIG. 19 shows a mixer with a cylindrical section which has reef-shaped surface depressions.
Fig. 20 und 21 zeigen Schnitte durch mehrfarbige Schaumstoff¬ verbundkorper die mit einem Mischeinsatz gemäß Fig. 4 hergestellt wurden. 20 and 21 show sections through multi-colored foam composite bodies which were produced with a mixing insert according to FIG. 4.

Claims

PATENTANSPRÜCHE PATENT CLAIMS
1. Verfahren zur Herstellung von Schaumstoffverbundkörpern bei dem mindestens zwei verschäumbare Polymerschmelzströme mit unterschied¬ lichen physikalischen und/oder chemischen Eigenschaften nach Begasung in einem Extruderwerkzeug zusammengeführt werden, dadurch gekenn¬ zeichnet, daß die Polymerschmelzströme zumindest teilweise gemischt und/oder verdreht und anschließend coextrudiert werden, so daß beliebige Muster in der Masse der Schaumstoffverbundkorper entstehen.1. A process for the production of foam composites in which at least two foamable polymer melt streams with different physical and / or chemical properties are brought together in an extruder tool after gassing, characterized in that the polymer melt streams are at least partially mixed and / or twisted and then coextruded , so that any pattern in the mass of the foam composite.
2. Verfahren zur Herstellung von Schaumstoffverbundköφern nach Anspruch 1 , dadurch gekennzeichnet, daß durch kontrolliertes Drehen eines in mindestens zwei der Polymerschmelzströme angebrachten Mischeinsatz die Polymerschmelzströme zumindest teilweise gemischt und/oder verdreht werden und anschließend durch einen Extrusionskopf coextrudiert werden.2. A process for the production of foam composite bodies according to claim 1, characterized in that the polymer melt streams are at least partially mixed and / or twisted by controlled turning of a mixing insert fitted in at least two of the polymer melt streams and are then coextruded through an extrusion head.
3. Verfahren zur Herstellung von Schaumstoffverbundkörpern nach Anspruch 2, dadurch gekennzeichnet, daß die Umdrehungsgeschwindigkeit des Mischeinsatzes stufenlos regelbar ist.3. A method for producing foam composite bodies according to claim 2, characterized in that the rotational speed of the mixing insert is infinitely variable.
4. Verfahren zur Herstellung von Schaumstoffverbundköφem nach einem der Ansprüche 2 oder 3, dadurch gekennzeichnet, daß die Polymer¬ schmelzströme stromaufwärts vor dem Mischeinsatz zusammengebracht werden.4. A process for the production of foam composite according to one of claims 2 or 3, characterized in that the polymer melt streams are brought together upstream of the mixing insert.
5. Verfahren zur Herstellung von Schaumstoffverbundkörpern nach einem der Ansprüche 2 oder 3, dadurch gekennzeichnet, daß die Polymer¬ schmelzströme innerhalb des Mischeinsatzes zusammengebracht werden.5. A method for producing foam composite bodies according to one of claims 2 or 3, characterized in that the polymer melt streams are brought together within the mixing insert.
6. Verfahren zur Herstellung von Schaumstoffverbundkörpem nach einem der Ansprüche 2 oder 3, dadurch gekennzeichnet, daß der6. A process for the production of foam composite bodies according to one of claims 2 or 3, characterized in that the
Extrusionskopf solidarisch mit dem Mischeinsatz drehbar ist.Extrusion head can be rotated in solidarity with the mixing insert.
7. Vorrichtung zur Herstellung von Schaumstoffverbundkörpern mit mindestens zwei Extrudern, die an ein Extruderwerkzeug angeschlossen sind und je einen verschäumbaren Polymerschmeizstrom in das Extruder- Werkzeug einspeisen, wobei die Polymerschmelzströme unterschiedliche physikalische und/oder chemische Eigenschaften aufweisen, dadurch gekennzeichnet, daß das Extruderwerkzeug einen, um die eigene Achse drehbaren Mischeinsatz umfaßt der die Polymerschmelzströme zumindest teilweise mischt und/oder verdreht.7. Device for producing foam composite bodies with at least two extruders, which are connected to an extruder die and each have a foamable polymer melt stream into the extruder die. Feed in the tool, the polymer melt streams having different physical and / or chemical properties, characterized in that the extruder tool comprises a mixing insert which can be rotated about its own axis and which at least partially mixes and / or rotates the polymer melt streams.
8. Vorrichtung zur Herstellung von Schaumstoffverbundkörpern nach Anspruch 7, dadurch gekennzeichnet, daß der Mischeinsatz ein Gehäuse und einen rotationssymetrischen Mischer umfaßt der in dem Gehäuse angebracht ist. 8. A device for producing foam composite bodies according to claim 7, characterized in that the mixing insert comprises a housing and a rotationally symmetrical mixer which is attached in the housing.
9. Vorrichtung zur Herstellung von Schaumstoffverbundkörpem nach9. Device for the production of foam composite bodies
Anspruch 7 oder 8, dadurch gekennzeichnet, daß der in mindestens einem der Polymerschmelzströme angebrachte Mischeinsatz mit zwischen 1 und 100 Umdrehungen pro Minute in beide Richtungen um die eigene Achse drehbar ist. Claim 7 or 8, characterized in that the mixing insert fitted in at least one of the polymer melt streams can be rotated in both directions about its own axis at between 1 and 100 revolutions per minute.
10. Vorrichtung zur Herstellung von Schaumstoffverbundkörpem nach10. Device for the production of foam composite bodies
Anspruch 8 oder 9, dadurch gekennzeichnet, daß das Gehäuse mit einem axialen Kanal verbunden ist, der einen Polymerschmeizstrom zu dem rotationssymetrischen Mischer führt.Claim 8 or 9, characterized in that the housing is connected to an axial channel which leads a polymer melt stream to the rotationally symmetrical mixer.
11. Vorrichtung zur Herstellung von Schaumstoffverbundkörpem nach Anspruch 8 oder 9, dadurch gekennzeichnet, daß die Polymerschmelz¬ ströme stromaufwärts, vor dem Gehäuse in einem ersten Abschnitt des Extruderwerkzeugs zusammen gebracht sind.11. The device for producing foam composite bodies according to claim 8 or 9, characterized in that the Polymerschmelz¬ streams are brought upstream, in front of the housing in a first section of the extruder die.
12. Vorrichtung zur Herstellung von Schaumstoffverbundkörpern nach einem der Ansprüche 7 bis 11 , dadurch gekennzeichnet, daß der rotations- symetrische Mischer eine Schnecke ist.12. Device for producing foam composite bodies according to one of claims 7 to 11, characterized in that the rotationally symmetrical mixer is a screw.
13. Vorrichtung zur Herstellung von Schaumstoffverbundkörpem nach einem der Ansprüche 7 bis 12, dadurch gekennzeichnet, daß das Extruder¬ werkzeug einen Motor umfaßt der den Mischeinsatz in beide Richtungen um die eigene Achse dreht. 13. Device for the production of foam composite bodies according to one of claims 7 to 12, characterized in that the extruder tool comprises a motor which rotates the mixing insert in both directions about its own axis.
H.Vorrichtung zur Herstellung von Schaumstoffverbundkörpem nach einem der Ansprüche 7 bis 13, dadurch gekennzeichnet, daß das Extruder¬ werkzeug einen Extrusionskopf umfaßt der solidarisch mit dem Mischeinsatz drehbar ist. H. Device for the production of foam composite bodies according to one of claims 7 to 13, characterized in that the extruder die comprises an extrusion head which can be rotated in solidarity with the mixing insert.
15. Vorrichtung zur Herstellung von Schaumstoffverbundkörpem nach15. Device for the production of foam composite bodies
Anspruch 13, dadurch gekennzeichnet, daß der Extrusionskopf form- und kraftschlüßig mit dem Mischeinsatz des Extruderwerkzeuges verbunden ist.Claim 13, characterized in that the extrusion head is positively and non-positively connected to the mixing insert of the extruder tool.
16. Vorrichtung zur Herstellung von Schaumstoffverbundkörpern nach einem der Ansprüche 13 bis 15, dadurch gekennzeichnet, daß der Motor durch einen Rechner gesteuert ist.16. The device for producing foam composite bodies according to one of claims 13 to 15, characterized in that the motor is controlled by a computer.
17. Schaumstoffverbundkörper mit beliebigen Mustern in seiner Masse aus mindestens zwei verschäumbaren Polymerschmelzströmen mit unter¬ schiedlichen physikalischen und/oder chemischen Eigenschaften.17. Foam composite body with any pattern in its mass from at least two foamable polymer melt streams with different physical and / or chemical properties.
18. Schaumstoffverbundkorper nach Anspruch 17, dadurch gekenn- zeichnet, daß der Schaumstoffverbundkorper ein Raumgewicht unterhalb von 100 kg/m3 .vorzugsweise unterhalb von 50 kg/m3, aufweist.18. Foam composite body according to claim 17, characterized in that the foam composite body has a density below 100 kg / m 3. Preferably below 50 kg / m 3 .
19. Schaumstoffverbundkorper nach Anspruch 17 oder 18 dadurch gekennzeichnet, daß der Schaumstoffverbundkorper eines oder mehrere der Polymere aus der Gruppe von LDPE, (Low Density Polyethylen), LLDPE (Linear Low Density Polyethylen), HDPE (High Density Polyethylen), PP (Polypropylen), PVC (Polyvinylchlorid), PS (Polystyrol), SAN (Styrol Acrylnitril), EVA (Ethylen Vinyl Acetat), und EAA (Ethylen Ethyl Acetat) umfaßt. 19. Foam composite body according to claim 17 or 18, characterized in that the foam composite body one or more of the polymers from the group of LDPE, (low density polyethylene), LLDPE (linear low density polyethylene), HDPE (high density polyethylene), PP (polypropylene) , PVC (polyvinyl chloride), PS (polystyrene), SAN (styrene acrylonitrile), EVA (ethylene vinyl acetate), and EAA (ethylene ethyl acetate).
EP96911957A 1995-04-26 1996-03-28 Process and device for producing co-extruded foam composites Withdrawn EP0822890A1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
LU88604A LU88604A1 (en) 1995-04-26 1995-04-26 Infinitely variable patterns, physical and chemical properties produced in foam co-extrusion method - by rotating foamable melts together with variable speed and direction under computer control in rotary casing containing mixing screw to produce firmly-welded but distinct interfaces between masses in composite.
LU88604 1995-04-26
LU88665A LU88665A7 (en) 1995-04-26 1995-09-27 Method and device for the production of coextruded foam composites
LU88665 1995-09-27
PCT/EP1996/001363 WO1996033855A1 (en) 1995-04-26 1996-03-28 Process and device for producing co-extruded foam composites

Publications (1)

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EP0822890A1 true EP0822890A1 (en) 1998-02-11

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EP96911957A Withdrawn EP0822890A1 (en) 1995-04-26 1996-03-28 Process and device for producing co-extruded foam composites

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AR (1) AR001683A1 (en)
AU (1) AU5497496A (en)
IL (1) IL117855A0 (en)
WO (1) WO1996033855A1 (en)

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FI982272A0 (en) 1998-10-21 1998-10-21 Natural Colour Kari Kirjavaine An extrusion

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DE1808271A1 (en) * 1968-09-10 1970-04-02 Yukio Nishikawa Synthetic resin films or hoses
EP0189270A3 (en) * 1985-01-24 1988-06-22 Mobil Oil Corporation Method for making articles from polymer blends
JPS61209118A (en) * 1985-03-14 1986-09-17 Matsushita Electric Works Ltd Manufacture of molding material with pattern
US5059375A (en) * 1989-11-13 1991-10-22 Minnesota Mining & Manufacturing Company Apparatus and method for producing kink resistant tubing

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