DD246727A1 - CONDITIONING DEVICE FOR PREPARING THERMOPLASTIC SYNTHESES - Google Patents
CONDITIONING DEVICE FOR PREPARING THERMOPLASTIC SYNTHESES Download PDFInfo
- Publication number
- DD246727A1 DD246727A1 DD86288187A DD28818786A DD246727A1 DD 246727 A1 DD246727 A1 DD 246727A1 DD 86288187 A DD86288187 A DD 86288187A DD 28818786 A DD28818786 A DD 28818786A DD 246727 A1 DD246727 A1 DD 246727A1
- Authority
- DD
- German Democratic Republic
- Prior art keywords
- melt
- foaming
- extrusion
- cooling
- zone
- 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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/36—Feeding the material to be shaped
- B29C44/46—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length
- B29C44/50—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length using pressure difference, e.g. by extrusion or by spraying
-
- 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
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
- B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
- B29C48/83—Heating or cooling the cylinders
- B29C48/834—Cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
- B29C48/86—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the nozzle zone
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
- B29C48/875—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling for achieving a non-uniform temperature distribution, e.g. using barrels having both cooling and heating zones
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92009—Measured parameter
- B29C2948/92209—Temperature
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92323—Location or phase of measurement
- B29C2948/92361—Extrusion unit
- B29C2948/92409—Die; Nozzle zone
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92904—Die; Nozzle zone
-
- 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
Abstract
Die Erfindung betrifft eine Vorrichtung zum kontinuierlichen Extrusionsschaeumen von Thermoplasten zur Erzeugung von mechanisch hoch beanspruchbaren Schaumextrudaten mit grober Zellstruktur. Es sollen geeignete Druck- und Temperaturbedingungen in der Schmelze vor und waehrend der Entspannungsphase geschaffen werden. Die Oberflaeche des unter Atmosphaerenbedingungen aufschaeumenden Extrudats soll ausreichend diffusionsbestaendig gegenueber den aus der Schmelze tretenden Treibgasen sein. Im Innern des Extrudats soll eine gleichmaessige grobzellige Schaumstruktur gebildet werden. Eine Konditioniervorrichtung zur Herstellung von Thermoplastschaeumen, gekoppelt an einer Extruder und ein Extrusionswerkzeug, besteht erfindungsgemaess aus einem Gehaeuse 6 und einem Schmelzenkanal 5, zwischen denen sich ein Kuehlmedium 7 befindet. Das Gehaeuse 6 ist durch Abstandshalter 8 vom Extrusionswerkzeug 3 getrennt, der Schmelzenkanal 5 ist mit dem Extrusionswerkzeug 3 direkt verbunden, und der Querschnitt des Schmelzenkanals 5 ist mit dem der Ausgangsoeffnung des Extrusionswerkzeuges 3 identisch. FigurThe invention relates to a device for the continuous extrusion foaming of thermoplastics for the production of mechanically highly stressable foam extrudates with a coarse cell structure. It should be created suitable pressure and temperature conditions in the melt before and during the relaxation phase. The surface of the extrudate, which foams under atmospheric conditions, should be sufficiently diffusion-resistant to the blowing gases emerging from the melt. Inside the extrudate, a uniform coarse-cell foam structure is to be formed. A conditioning device for the production of thermoplastic foams, coupled to an extruder and an extrusion die, according to the invention consists of a housing 6 and a melt channel 5, between which a cooling medium 7 is located. The housing 6 is separated from the extrusion die 3 by spacers 8, the melt channel 5 is directly connected to the extrusion die 3, and the cross section of the melt channel 5 is identical to the exit opening of the extrusion die 3. figure
Description
Eine Konditioniervorrichtung, gekoppelt an einen Extruder und ein Extrusionswerkzeug, besteht erfindungsgemäß aus einem Gehäuse und einem Schmelzenkanal, zwischen denen sich ein Kühlmedium befindet. Das Gehäuse ist durch Abstandhalter vom Extrusionswerkzeug getrennt. Der Schmelzenkanal ist mit dem Extrusionswerkzeug direkt verbunden, und der Querschnitt desA conditioning device, coupled to an extruder and an extrusion die, according to the invention consists of a housing and a melt channel, between which there is a cooling medium. The housing is separated from the extrusion tool by spacers. The melt channel is directly connected to the extrusion die, and the cross section of the
S.chmelzenkanals ist mit dem der Ausgangsöffnung des Extrusionswerkzeuges identisch.S.melt channel is identical to that of the exit opening of the extrusion die.
Die im Extruder erzeugte Schmelze und das hinzugefügte geeignete physikalisch wirkende Treibmittel, dem gegebenenfalls noch eine Trägersubstanz für das Eintragen des Treibmittels in den Extrusionsprozeß zugesetzt wird, wird zum Extrusionswerkzeug befördert. Das Gehäuse der Konditioniervorrichtung ist von dem Extrusionswerkzeug räumlich getrennt, um gegenseitige thermische Beeinflussung so gering wie möglich zu halten. Damit bleibt eine Viskositätsveränderung der Schmelze vor dem Austritt aus dem Extrusionswerkzeug ausgeschlossen. Der Querschnitt des Extrusionswerkzeuges verjüngt sich so, daß er beim Ausgang mit dem des Schmelzenkanals der Konditioniervorrichtung identisch ist, wodurch sich auch Pfropfenströmung im Schmelzenkanal einstellt. Es erfolgt eine differenzierte Temperierung der äußeren Randzonen des Extrudats, während die Volumenanteile im Inneren ihre vom Scher- und.Transportprozeß im Extruder hervorgerufene hohe Temperatur beibehalten. Die Umfangsflächen des Extrudats werden so abgekühlt, daß sie nach Austreten in die Atmosphäre genügend diffusionsbeständig gegenüber den aus der Lösung tretenden Treibgasen sind und diese im Extrudat halten. Gleichzeitig ist die Fließfähigkeit der Extrudatoberfläche noch ausreichend, um dem von innen wirkenden Schäumdruck nachzugeben, ohne zu reißen. Im Extrudatinneren entsteht durch die relativ hohe Massetemperatur und die damit verbundene niedrige Schmelzenviskosität eine grobzellige Schaumstruktur.The melt produced in the extruder and the added suitable physical blowing agent, to which optionally a carrier substance for the introduction of the blowing agent is added in the extrusion process, is conveyed to the extrusion die. The housing of the conditioning device is spatially separated from the extrusion die to minimize mutual thermal interference. This prevents a change in the viscosity of the melt before it leaves the extrusion die. The cross-section of the extrusion die tapers so that at the exit it is identical to that of the melt channel of the conditioning device, whereby plug flow also sets in the melt channel. There is a differentiated tempering of the outer edge zones of the extrudate, while maintaining the volume fractions in the interior of their shear and .Transportprozeß caused in the extruder high temperature. The peripheral surfaces of the extrudate are cooled so that they are sufficiently resistant to diffusion after passing into the atmosphere with respect to the propellant gases passing from the solution and keep them in the extrudate. At the same time, the flowability of the extrudate surface is still sufficient to yield to the foaming pressure acting from within, without tearing. Due to the relatively high melt temperature and the associated low melt viscosity, a coarse-cell foam structure is produced in the extrudate interior.
Mit der erfindungsgemäßen Vorrichtung können Thermoplastschäume mit Dichten kleiner 0,1 g cm~3 mit Extrudern, die kleine Längen-Durchmesser-Verhältnisse der Schnecke, z.B. 25D, aufweisen, hergestellt werden.With the device according to the invention thermoplastic foams having densities less than 0.1 g cm ~ 3 can be produced with extruders which have small length-diameter ratios of the screw, for example 25D.
Es ist möglich, Altfolien aus Industrie und Landwirtschaft sowie Polyolefin-Abfallgemische, wie die Schwimmfraktion der rückgeführten Haushalt-Plastabfälle, zu verschäumen.It is possible to foam old industrial and agricultural films as well as polyolefin waste mixtures, such as the floating fraction of recycled household waste plastics.
Es entstehen grobzellige Schäume niedriger Dichte und relativ hoher Festigkeit aus Thermoplasten oder Thermoplastabfälien, insbesondere aus Polyolefinen mit Schmelzindizes größer 1 g (600see)"1.The result is coarse-cell foams of low density and relatively high strength of thermoplastics or thermoplastic waste, in particular of polyolefins with melt indices greater than 1 g (600see) " 1 .
Ausführungsbeispielembodiment
Es zeigen Figur 1: Seitenansicht der Konditioniervorrichtung, gekoppelt an Extruder und Extrusionswerkzeug Figur 2: Querschnitt der Konditioniervorrichtung mit unmittelbarem Anschluß an ExtrusionswerkzeugFIG. 1 shows a side view of the conditioning device coupled to the extruder and extrusion tool. FIG. 2: Cross section of the conditioning device with direct connection to the extrusion tool
Die Schwimmfraktion aus rückgeführten Haushalt-Plastabfällen wird mit einem Schneidgranulator zu rieselfähigem Schüttgut mit Korngrößen kleiner4mm zerkleinert. Die Messung des Schmelzindexvon diesem Material ergibt7g (600sec)~1. 840 Teile dieses aufbereiteten Polyolefin-Abfallgemisches werden mit 150 Teilen gemahlenen Kaolins gemischt. Dieser Mischung werden als Keimbildner und zur teilweisen Vernetzung 10 Teile einer Mischperoxidlösung zugesetzt, die aus Cyclohexanon- und Methylcyclohexanonperoxiden mit ca. 40% Dibutylphthalat besteht. Als physikalisch wirkendes Treibmittel werden 60 ml Methanol pro Kilogramm dieser Vermischung zugesetzt und eingearbeitet.The floating fraction from recycled household plastic wastes is comminuted with a cutting granulator into free-flowing bulk material with particle sizes smaller than 4 mm. The measurement of the melt index of this material gives 7g (600sec) ~ 1 . 840 parts of this recycled polyolefin waste mixture are mixed with 150 parts of ground kaolin. 10 parts of a mixed peroxide solution consisting of cyclohexanone and methylcyclohexanone peroxides with about 40% of dibutyl phthalate are added to this mixture as nucleating agents and for partial crosslinking. As a physically acting propellant 60 ml of methanol per kilogram of this mixture are added and incorporated.
Die Mischung wird in den Trichter 1 eines 45-mm-Einschneckenextruders mit 25D Länge gegeben, dessen Extrusionswerkzeug 3 eine 16-mm-Runddüse als Ausgangsöffnung aufweist. An das Extrusionswerkzeug 3 schließt sich die Konditioniervorrichtung, die aus einem Schmelzenkanal 5 und einem Gehäuse 6 besteht, zwischen denen sich ein Kühlmedium 7 befindet, an. Der Durchmesser des Schmelzenkanals 5 beträgt ebenfalls 16mm, seine Länge beträgt insgesamt 280 mm. Das Gehäuse 6 ist durch Abstandhalter 8 vom Extrusionswerkzeug 3 getrennt. Die Umdrehungszahl der Schnecke wird auf 40min"1 eingestellt. Aufgrund des Lösungsmittelgehaltes des Extrusionsgutes liegen die Zylindertemperaturen des Einschneckenextruders 2 unterhalb des für vergleichbare Polyethylensorten üblichen Bereiches. Sie werden so eingestellt, daß die Massetemperatur vor der Schneckenspitze 433 K beträgt. Die Temperatur des Kühlmediums 7 zwischen Gehäuse 6 und Schmelzenkanal 5 wird nach dem Anfahren auf 399 K reduziert. Im Extruder 2, unmittelbar vor der Konditioniervorrichtung, baut sich ein Massedruck von 75bar bis 80 bar auf. Nach dem Verlassen der Konditioniervorrichtung 4 schäumt dastreibmittelhaltige Extrudat zu einem Rundprofil von ca. 75 mm Durchmesser auf. An der Oberfläche des Profils werden in der Aufschäumphase 401 K bis404K gemessen, während im Inneren des Profils 431 K vorliegen.The mixture is placed in the hopper 1 of a 25-mm 45-mm single-screw extruder whose extrusion die 3 has a 16-mm round die as the exit port. The conditioning tool, which consists of a melt channel 5 and a housing 6, between which a cooling medium 7 is located, adjoins the extrusion die 3. The diameter of the melt channel 5 is also 16mm, its length is a total of 280 mm. The housing 6 is separated by spacers 8 from the extrusion die 3. The number of revolutions of the screw is set to 40min " 1. Due to the solvent content of the extruded material, the cylinder temperatures of the single-screw extruder 2 are below the usual range for comparable types of polyethylene They are adjusted so that the melt temperature before the screw tip is 433 K. The temperature of the cooling medium 7 between the housing 6 and the melt channel 5 is reduced after starting to 399 K. In the extruder 2, immediately before the conditioning device, a melt pressure of 75 bar to 80 bar builds up. 75 mm in diameter, 401 K to 404 K are measured in the foaming phase on the surface of the profile, while 431 K are present in the interior of the profile.
Während der Abkühlphase kollabiert das Schaumprofil durch den Unterdruck in den Schaumzeilen bei Erreichen der KondensationstemperaturdesTreibmittels gleichmäßig auf den endgültigen Durchmesservon 55mm bis 58mm. Die Dichte des erzeugten Schaumes beträgt 0,055g/cm~3. Die Schaumstränge besitzen eine geschlossene Oberfläche und im Innern eine Zellstruktur mit 3 bis 6mm Durchmesser.During the cooling phase, the foam profile collapses evenly to the final diameter of 55mm to 58mm due to the negative pressure in the foam lines upon reaching the condensing temperature of the propellant. The density of the foam produced is 0.055 g / cm -3 . The foam strands have a closed surface and inside a cell structure with 3 to 6mm diameter.
Die Schraumprofile können in einer Warmformpresse z. B. zu plattenförmigen Elementen mit folgenden Eigenschaften weiterverarbeitet werden:The Schraumprofile can in a hot press z. B. to plate-shaped elements with the following properties:
Probe 1 Probe 2Sample 1 Sample 2
Derartige Formkörper eignen sich aufgrund ihrer Dämmwirkung, Feuchte- und Verrottungsbeständigkeit sowie Druckfestigkeit z. B. für vielfältige spezielle Wärmedämmprobleme im Bauwesen und stellen eine effektive Verwertungsvariante für Polyolefin-Abfälledar.Such moldings are suitable because of their insulating effect, moisture and rotting resistance and compressive strength z. B. for a variety of special thermal insulation problems in construction and provide an effective Verwertungsvariante for polyolefin Abfälledar.
Claims (1)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DD86288187A DD246727A1 (en) | 1986-03-24 | 1986-03-24 | CONDITIONING DEVICE FOR PREPARING THERMOPLASTIC SYNTHESES |
DE19873708082 DE3708082A1 (en) | 1986-03-24 | 1987-03-13 | Conditioning device for producing thermoplastic foams |
SU877774473A SU1731647A1 (en) | 1986-03-24 | 1987-03-24 | Extruder conditioning device for obtaining products from frothed thermoplasts |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DD86288187A DD246727A1 (en) | 1986-03-24 | 1986-03-24 | CONDITIONING DEVICE FOR PREPARING THERMOPLASTIC SYNTHESES |
Publications (1)
Publication Number | Publication Date |
---|---|
DD246727A1 true DD246727A1 (en) | 1987-06-17 |
Family
ID=5577422
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DD86288187A DD246727A1 (en) | 1986-03-24 | 1986-03-24 | CONDITIONING DEVICE FOR PREPARING THERMOPLASTIC SYNTHESES |
Country Status (3)
Country | Link |
---|---|
DD (1) | DD246727A1 (en) |
DE (1) | DE3708082A1 (en) |
SU (1) | SU1731647A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ATE121986T1 (en) * | 1989-12-27 | 1995-05-15 | Sekisui Plastics | THERMOPLASTIC POLYESTER RESIN FOAM AND PRODUCTION METHOD. |
DE4333480A1 (en) * | 1993-10-01 | 1995-04-06 | Krupp Ag Hoesch Krupp | Process and apparatus for mounting and/or guiding elastically or plastically deformable solid-profile or hollow-profile elements subjected to longitudinal force |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE524084A (en) * | 1950-06-29 | 1900-01-01 | ||
US3151192A (en) * | 1961-07-24 | 1964-09-29 | Sun Chemical Corp | Method of extruding a foamed thermoplastic product |
LU45097A1 (en) * | 1963-06-07 | 1964-02-24 | ||
DK126094A (en) * | 1966-09-07 | 1900-01-01 | ||
US3751377A (en) * | 1971-08-19 | 1973-08-07 | Dow Chemical Co | Method for the preparation of plastic foam |
IT1109660B (en) * | 1978-02-23 | 1985-12-23 | Lavorazione Mat Plast | REFINEMENT FOR EXTRUSION OF SYNTHETIC FOAMS |
US4424287A (en) * | 1980-06-10 | 1984-01-03 | Mobil Oil Corporation | Polymer foam process |
-
1986
- 1986-03-24 DD DD86288187A patent/DD246727A1/en not_active IP Right Cessation
-
1987
- 1987-03-13 DE DE19873708082 patent/DE3708082A1/en active Granted
- 1987-03-24 SU SU877774473A patent/SU1731647A1/en active
Also Published As
Publication number | Publication date |
---|---|
SU1731647A1 (en) | 1992-05-07 |
DE3708082A1 (en) | 1987-10-01 |
DE3708082C2 (en) | 1990-12-20 |
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