WO1996033855A1 - Verfahren und vorrichtung zur herstellung von coextrudierten schaumstoffverbundkörpern - Google Patents
Verfahren und vorrichtung zur herstellung von coextrudierten schaumstoffverbundkörpern Download PDFInfo
- Publication number
- WO1996033855A1 WO1996033855A1 PCT/EP1996/001363 EP9601363W WO9633855A1 WO 1996033855 A1 WO1996033855 A1 WO 1996033855A1 EP 9601363 W EP9601363 W EP 9601363W WO 9633855 A1 WO9633855 A1 WO 9633855A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- foam composite
- polymer melt
- mixing insert
- composite bodies
- melt streams
- Prior art date
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
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP96911957A EP0822890A1 (de) | 1995-04-26 | 1996-03-28 | Verfahren und vorrichtung zur herstellung von coextrudierten schaumstoffverbundkörpern |
AU54974/96A AU5497496A (en) | 1995-04-26 | 1996-03-28 | Process and device for producing co-extruded foam composites |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
LU88604A LU88604A1 (de) | 1995-04-26 | 1995-04-26 | Verfahren und Vorrichtung zur Herstellung von coextrudierten Schaumstoffverbundkoerpern |
LU88604 | 1995-04-26 | ||
LU88665A LU88665A7 (de) | 1995-04-26 | 1995-09-27 | Verfahren und Vorrichtung zur Herstellung von coextrudierten Schaumstoffverbundkoerpern |
LU88665 | 1995-09-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1996033855A1 true WO1996033855A1 (de) | 1996-10-31 |
Family
ID=26640359
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1996/001363 WO1996033855A1 (de) | 1995-04-26 | 1996-03-28 | Verfahren und vorrichtung zur herstellung von coextrudierten schaumstoffverbundkörpern |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0822890A1 (de) |
AR (1) | AR001683A1 (de) |
AU (1) | AU5497496A (de) |
IL (1) | IL117855A0 (de) |
WO (1) | WO1996033855A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6585923B1 (en) | 1998-10-21 | 2003-07-01 | Natural Colour Kari Kirjavainen Oy | Extrusion method and extruder |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2017685A1 (en) * | 1968-09-10 | 1970-05-22 | Nishikawa Yukio | Thermoplastics film or sleeve for packing/protection/ - decoration reinforced with ribs of any hardness or design |
EP0189270A2 (de) * | 1985-01-24 | 1986-07-30 | Mobil Oil Corporation | Verfahren zum Herstellen von Gegenständen aus Polymermischungen |
JPS61209118A (ja) * | 1985-03-14 | 1986-09-17 | Matsushita Electric Works Ltd | 模様付成形材料の製造方法 |
US5059375A (en) * | 1989-11-13 | 1991-10-22 | Minnesota Mining & Manufacturing Company | Apparatus and method for producing kink resistant tubing |
-
1996
- 1996-03-28 WO PCT/EP1996/001363 patent/WO1996033855A1/de not_active Application Discontinuation
- 1996-03-28 AU AU54974/96A patent/AU5497496A/en not_active Abandoned
- 1996-03-28 EP EP96911957A patent/EP0822890A1/de not_active Withdrawn
- 1996-04-09 IL IL11785596A patent/IL117855A0/xx unknown
- 1996-04-23 AR AR33625096A patent/AR001683A1/es unknown
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2017685A1 (en) * | 1968-09-10 | 1970-05-22 | Nishikawa Yukio | Thermoplastics film or sleeve for packing/protection/ - decoration reinforced with ribs of any hardness or design |
EP0189270A2 (de) * | 1985-01-24 | 1986-07-30 | Mobil Oil Corporation | Verfahren zum Herstellen von Gegenständen aus Polymermischungen |
JPS61209118A (ja) * | 1985-03-14 | 1986-09-17 | Matsushita Electric Works Ltd | 模様付成形材料の製造方法 |
US5059375A (en) * | 1989-11-13 | 1991-10-22 | Minnesota Mining & Manufacturing Company | Apparatus and method for producing kink resistant tubing |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 11, no. 44 (M - 560)<3491> 10 February 1987 (1987-02-10) * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6585923B1 (en) | 1998-10-21 | 2003-07-01 | Natural Colour Kari Kirjavainen Oy | Extrusion method and extruder |
Also Published As
Publication number | Publication date |
---|---|
IL117855A0 (en) | 1996-08-04 |
EP0822890A1 (de) | 1998-02-11 |
AR001683A1 (es) | 1997-11-26 |
AU5497496A (en) | 1996-11-18 |
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