WO1999004949A1 - Procede et filiere d'extrusion de tubes de matiere thermoplastique, et tubes ainsi obtenus - Google Patents

Procede et filiere d'extrusion de tubes de matiere thermoplastique, et tubes ainsi obtenus Download PDF

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Publication number
WO1999004949A1
WO1999004949A1 PCT/EP1998/003522 EP9803522W WO9904949A1 WO 1999004949 A1 WO1999004949 A1 WO 1999004949A1 EP 9803522 W EP9803522 W EP 9803522W WO 9904949 A1 WO9904949 A1 WO 9904949A1
Authority
WO
WIPO (PCT)
Prior art keywords
plate
die
tubes
extrusion
pet
Prior art date
Application number
PCT/EP1998/003522
Other languages
English (en)
Inventor
Valdo Romanatti
Adriano Caiola
Original Assignee
Bdr S.R.L.
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=11377597&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO1999004949(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Bdr S.R.L. filed Critical Bdr S.R.L.
Priority to AU81107/98A priority Critical patent/AU8110798A/en
Publication of WO1999004949A1 publication Critical patent/WO1999004949A1/fr

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
    • B29C48/25—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
    • B29C48/87—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
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/11—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels comprising two or more partially or fully enclosed cavities, e.g. honeycomb-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
    • B29C48/03—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
    • 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
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • 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
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0072—Roughness, e.g. anti-slip
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/60—Multitubular or multicompartmented articles, e.g. honeycomb

Definitions

  • This invention relates both to a method and die for extruding tubes of pure or modified polyethyeleneterephthalate (PET), and also to the tubes obtained thereby.
  • PET polyethyeleneterephthalate
  • tubes easily and economically by extrusion from various thermoplastic materials, such as polyethylene and polypropylene, such tubes possibly comprising internal ribs or fins, or continuous walls extending between opposing surfaces of the tubes to define therein a plurality of individual cavities separated one from another.
  • thermoplastic materials such as polyethylene and polypropylene
  • thermoplastic material used to form a tube is melted in an extruder comprising one or more screws which urge this material to pass through profiled apertures provided in an extrusion die.
  • the plastic mass is substantially uniformly cooled to a temperature at which the mass has a plasticity enabling it to be easily expelled through the discharge apertures in the die, while simultaneously assuming a consistency sufficient to prevent the just extruded tube collapsing or seriously deforming immediately on its exit from the die, so enabling the tube to be rapidly cooled, to solidify it.
  • thermoplastic material has sufficient plasticity to enable it to be easily extruded through the die, while at the same time possessing sufficient consistency to enable the just extruded tube, still in the pasty state, not to deform and not to collapse on leaving the die, is a fundamental fact of the known art.
  • Extrusion methods and apparatus can be very simple, but become relatively complex if it is sought to extrude thermoplastic materials in which the aforesaid temperature range is small.
  • US patent 4,216,253 describes a method and an apparatus involving rigorous and difficult temperature control of the entire mass of thermoplastic material present upstream of the extrusion plate, such as to maintain this temperature as close as possible to the solidification temperature of the plastic material as it becomes further cooled in its passage through the apertures of the extrusion plate, which have a carefully gauged and uniform width along their entire length.
  • the extrusion plate is of considerable length to make the temperature of the entire material mass passing through the plate discharge apertures as uniform as possible.
  • the upstream surface of the extrusion plate is totally in contact with the plastic material within the extruder and hence has substantially the same temperature thereas.
  • the entire plastic mass urged through the extrusion plate apertures has a uniform temperature which slowly decreases as this mass approaches the exit from the gauged apertures of the plate.
  • US patent 4,597,932 and JP patent 51014973 (database WPI XP002048596) describe PET tubes with internal ribs. According to that described in US patent 4,597,932, these tubes arc extruded through a vertical extrusion head, such that the material forming the tubes leaves the die still in the plastic state and descends vertically by gravity, to be then cooled very energetically to harden and crystallize the PET.
  • French patent FR 2 128 146 describes plastic tubes provided with continuous longitudinal walls within their cavity, and cites many thermoplastic materials, including also polyesters. In fact, polyesters are mentioned only as part of a very long list of thermoplastic materials, but the patent describes no method which makes it possible to produce PET tubes of the stated type.
  • PET is a thermoplastic material possessing high resistance to cold and to defor abil ity at high temperature, however its workability is quite different from all the other thermoplastic materials usually extruded in the form of tubes. In this respect, if the
  • PET is given a temperature providing it with sufficient plasticity and flowability to enable it to be extruded in the form of a tube, this tube would not have sufficient mechanical strength to prevent it from collapsing onto the outer surface of the die (unless the tube is of very small dimensions and the extrusion head is vertical, or unless the tube is without internal ribs or walls and it is maintained "inflated” by feeding compressed air into it).
  • the PET mass passing through the die is uniformly cooled within the extrusion plate to give the extruded tube the necessary consistency and mechanical strength, it becomes very difficult to expel this tube through the die apertures, and it becomes indeed impossible to perform the extrusion if the tube has continuous walls extending within its cavity.
  • the main object of this invention is to provide a method and die which enable in particular PET (whether virgin or salvaged, including the amorphous type known as APET, and whether pure or modified, ie homopolymer or copoly er) to be easily extruded into tubes, possibly with ribs or the like projecting into their cavity or with continuous walls which divide the cavity of each tube into a plurality of smaller separate cavities.
  • PET whether virgin or salvaged, including the amorphous type known as APET, and whether pure or modified, ie homopolymer or copoly er
  • the invention also relates to the tubes obtained thereby,
  • the method for extruding tubes of thermoplastic material through the apertures in the extrusion plate of an extruder consists of maintaining said material in the plastic state immediately upstream of said plate, and is characterised by rapidly and suddenly cooling the surface of the material under extrusion while it passes through the extrusion plate, to a temperature such that the tube leaving the extrusion plate apertures is formed of material in the plastic state, the outer layer of which has been cooled to a temperature which is sufficiently low as to give mechanical consistency to the layer itself, the thus extruded tube being then cooled in known manner.
  • the die according to the invention comprises an extrusion plate which is characterised by being in direct contact with the remaining part of the die within a very limited region of its surface around the extrusion apertures, the extrusion apertures provided in said plate being at least partly bounded by surfaces which diverge towards the outer surface of the plate.
  • the extrusion plate is preferably of bronze construction.
  • Figure 1 is a schematic axial longitudinal section through a die, taken on a vertical plane;
  • Figure 2 is a cross-section through the die on the line 2-2 of
  • Figure 3 is a front view on an enlarged scale of the die viewed from the left in Figure 1;
  • Figure 4 is a perspective view of a portion of PET tube obtained by the die of the preceding figures.
  • Figure 1 shows a schematic longitudinal section through a die comprising an element 1, 2 for connection to an extruder (of traditional structure, for example of single-screw type, not shown on the drawing), a first plate 3, a second plate 4 and a third plate 5.
  • each appendix is traversed by a cavity 7 which also extends through the entire thickness of the plate 3 and has one of its ends open at the free end of the appendix itself and its other end (which is in free communication with atmosphere) opening at that surface of the plate 3 distant from the surface from which the appendices 6 project.
  • the plate 4 (which acts as the die for regulating the thickness of the extruded tube) is traversed by an aperture (of substantially rectangular cross-section, the area of which gradually decreases in the direction away from the plate 3, with respect to Figure 1) through which there extend - to project beyond the plate 4 - the appendices 6, the outer surfaces of which define with the opposing surface of said aperture in the plate 4 an empty annular space clearly visible in Figure 1, and of which the thickness substantially corresponds to that of the tube to be extruded by the die.
  • an aperture of substantially rectangular cross-section, the area of which gradually decreases in the direction away from the plate 3, with respect to Figure 1
  • This annular space opens at one end into a chamber 8 provided in that surface of the plate 4 facing the plate 3, the chamber 8 communicating, via two feed channels 9 provided in the plate 3, via two channels 10 provided in the element 2 and a channel 11 provided in the element 1, with the discharge mouth of an extruder, not shown on the drawing.
  • the connection elements 1, 2 and the plates 3, 4 are kept pressed securely one against the other (to form a very rigid single body) by tie bolts or screws, some of which are shown by dashed lines in Figure 1 (these not having been numbered for simplicity) and which pass through holes, some of which are visible in Figures 2 and 3 in which they are indicated by the reference numeral 12.
  • the connector 1, 2 and plates 3, 4 are provided internally with temperature-controlled electrical resistance elements, for simplicity also not shown on the drawings as their structure, position and function are obvious to the expert of the art.
  • the plate 5 which is advantageously of bronze construction, also internally houses temperature-controlled electrical resistance elements housed in appropriate cavities provided in the plate (two of these are shown schematically in Figures 1 and 3, and are indicated by the reference numeral 14).
  • An essential characteristic of the die according to the invention claimed herein is that the cross-section of the aperture provided in the plate 5 and into which the free ends of the appendices 6 extend widens from its region closest to the plate 4 towards the free end of the said aperture, ie towards the outside, to hence define with the opposing surface of the appendices 6 an annular space 15 which branches or widens outwards, as can be seen in Figure 1, and also in Figure 3 in which the plate is shown frontally from the outside, enabling it to be seen that the surface of the aperture provided in the plate 5 is bounded by a double continuous line 15A.
  • the described die is used by connecting the free end of the part 1 of its connection element 1 , 2 to the discharge mouth of an extruder (for example of single-screw type) for example fed with pure amorphous PET or, very advantageously for many uses, with PET scrap or recycled or modified PET.
  • the PET (a material which softens between +180°C and +215 ° C and which melts at +238°C) is expelled from the extruder in the molten state and fed into the die channel 11 at a temperature of about 250 ° C ( ⁇ 8-9°C).
  • the temperature in the plates 2, 3 and 4 is rapidly lowered so that, at its exit from the chamber defined within the plate 4, the PET mass has a temperature of between about 205°C and +185°C, ie lower than the melting point of PET but higher than the temperature at which it begins to crystallize.
  • the PET mass which passes into the annular space provided in the plate 5 is suddenly and rapidly cooled thereat to reach a temperature very close to that at which it begins to soften, ie to about 195°C ( ⁇ 9-10°C), at which the extruded PET mass begins to harden in contact with the cold surface of the plate 5, to form a sort of thin solid shell within which the mass is still in a sufficiently pasty state to be able to be pushed out of the die.
  • the extrusion can continue without difficulty because this tube is pushed through an annular space which widens outwards and hence exerts much lesser friction on the already hardened outer surface of the extruded tube.
  • the temperature of the PET mass at the die exit must hence be sufficiently high to enable extrusion to continue (ie mass solidification of the extruded tubular body must not occur) while at the same time the temperature of the plate 5 must be sufficiently low to cause the shaped body (tube) still within the cavity in the die plate 5 to assume a sufficient surface consistency to enable the extruded tube not to collapse onto the surface of the aperture provided in the plate 5.
  • the hardened thin outer surface layer of the extruded tube acts as a support for the ribs or continuous walls present within the tube cavity and still in the plastic state.
  • thermoplastic material in particular of PET, in the sufficiently pasty state leaving the plate 4, must be very quickly cooled in contact with the plate 5, but without blocking the die.
  • tubes of PET homopolymer or copolymer for example amorphous PET or recycled PET, ie originating from salvaged mineral water or drink bottles, sheets and the like
  • PET homopolymer or copolymer for example amorphous PET or recycled PET, ie originating from salvaged mineral water or drink bottles, sheets and the like
  • the extruded tubes can be subjected to the usual gauging operations commonly effected on extruded tubes of plastic material .
  • the tubes obtained according to the invention have high mechanical strength both at very low temperature and at relatively high temperature, in addition to very good resistance to ageing.
  • the PET tubes can hence be used for conveying fluids or for forming any strong structure requiring the use of tubes, for example for forming window frames.
  • a particularly interesting application is to use pieces of PET tube to form structures for supporting and transporting goods including heavy goods, such as pallets formed by joining such tube pieces together by PET nails or screws or by welding, and possibly interposing plugs of PET or other materials between the tube pieces joined together.
  • the die is of single impression type, ie enabling a single tube to be extruded. It is however apparent that the die can be shaped with more than one impression, to allow simultaneous extrusion of two or more separate tubes simultaneously.
  • the invention hence relates both to the extrusion method and die, and also to the extruded tubes obtained thereby.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne un procédé et une filière d'extrusion de tubes en matière thermoplastique, notamment en polyéthylènetéréphtalate (PET). Le procédé consiste, lors de l'extrusion d'un tube de PET encore à l'état plastique, à refroidir soudainement et rapidement la surface extérieure de ce tube, par rapport à une région d'extrémité étroite de la filière, de façon à provoquer le durcissement d'une couche superficielle extérieure du tube, la surface de la filière correspondant à cette zone d'extrémité limitée s'élargissant vers l'extérieur.
PCT/EP1998/003522 1997-07-22 1998-06-10 Procede et filiere d'extrusion de tubes de matiere thermoplastique, et tubes ainsi obtenus WO1999004949A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU81107/98A AU8110798A (en) 1997-07-22 1998-06-10 Method and die for extruding tubes of thermoplastic material, and the tubes obtained thereby

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT97MI001728A IT1293748B1 (it) 1997-07-22 1997-07-22 Elementi tubolari con nervature o pareti interne realizzati in pet, strutture resistenti realizzate con tali elementi e filiera per
ITMI97A001728 1997-07-22

Publications (1)

Publication Number Publication Date
WO1999004949A1 true WO1999004949A1 (fr) 1999-02-04

Family

ID=11377597

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1998/003522 WO1999004949A1 (fr) 1997-07-22 1998-06-10 Procede et filiere d'extrusion de tubes de matiere thermoplastique, et tubes ainsi obtenus

Country Status (3)

Country Link
AU (1) AU8110798A (fr)
IT (1) IT1293748B1 (fr)
WO (1) WO1999004949A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006096898A2 (fr) * 2005-03-16 2006-09-21 Greiner Extrusionstechnik Gmbh Dispositif support pour un outil d'extrusion ainsi qu'outil d'extrusion permettant de faconner un article

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114769277B (zh) * 2022-04-22 2024-01-30 中国环境科学研究院 一种危险废物分级管理装置及管理方法

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2128146A1 (en) * 1971-03-08 1972-10-20 Cem Comp Electro Mec Heat exchanger tower - packing of honeycomb cross-section extrusions in plastics material
JPS5114973A (fr) * 1974-07-29 1976-02-05 Teijin Chemicals Ltd
FR2370571A1 (fr) * 1976-11-11 1978-06-09 Ingen Housz Jan Procede et dispositif de fabrication de tubes et tuyaux calibres exterieurement au moyen d'une matiere thermoplastique
US4216253A (en) * 1976-12-09 1980-08-05 Rhone-Poulenc Industries Molding process for the fabrication of hollow shaped articles
US4597932A (en) * 1983-06-27 1986-07-01 Aubex Corporation Method of manufacturing synthetic resin pen nibs
DE4123897A1 (de) * 1991-07-18 1993-01-21 Preform Raumgliederungssysteme Anschlussprofil fuer eine stellwand
FR2693942A1 (fr) * 1992-07-22 1994-01-28 Carbolux Spa Plaque alvéolaire pliable en matière plastique, procédé de fabrication de cette plaque et dispositif pour la mise en Óoeuvre du procédé.
DE4244594A1 (de) * 1992-12-31 1994-07-07 Doellken & Co Gmbh W Verwendung von Polyethylenterephathalat als Werkstoff für die Herstellung von extrusionsstranggepreßten Profilen
DE4417623A1 (de) * 1994-05-19 1995-11-23 Johannes Dr Ing Weber Profilwerkzeug zum Herstellen von Hohlprofilen mit mehr als einer Hohlkammer
NL9400937A (nl) * 1994-06-09 1996-01-02 Tech Ind W J Van Der Sar B V Werkwijze en inrichting voor het vervaardigen van een naadloos doorzichtig kokerprofiel.
US5567505A (en) * 1994-08-16 1996-10-22 Solvay (Soci et e Anonyme) Means and method of applying a plastic finishing layer to the surface of a composite article; coated composite article
WO1996038498A1 (fr) * 1995-05-29 1996-12-05 Hoechst Aktiengesellschaft Plaque coloree transparente amorphe en thermoplaste cristallisable, son procede de fabrication et son utilisation

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2128146A1 (en) * 1971-03-08 1972-10-20 Cem Comp Electro Mec Heat exchanger tower - packing of honeycomb cross-section extrusions in plastics material
JPS5114973A (fr) * 1974-07-29 1976-02-05 Teijin Chemicals Ltd
FR2370571A1 (fr) * 1976-11-11 1978-06-09 Ingen Housz Jan Procede et dispositif de fabrication de tubes et tuyaux calibres exterieurement au moyen d'une matiere thermoplastique
US4216253A (en) * 1976-12-09 1980-08-05 Rhone-Poulenc Industries Molding process for the fabrication of hollow shaped articles
US4597932A (en) * 1983-06-27 1986-07-01 Aubex Corporation Method of manufacturing synthetic resin pen nibs
DE4123897A1 (de) * 1991-07-18 1993-01-21 Preform Raumgliederungssysteme Anschlussprofil fuer eine stellwand
FR2693942A1 (fr) * 1992-07-22 1994-01-28 Carbolux Spa Plaque alvéolaire pliable en matière plastique, procédé de fabrication de cette plaque et dispositif pour la mise en Óoeuvre du procédé.
DE4244594A1 (de) * 1992-12-31 1994-07-07 Doellken & Co Gmbh W Verwendung von Polyethylenterephathalat als Werkstoff für die Herstellung von extrusionsstranggepreßten Profilen
DE4417623A1 (de) * 1994-05-19 1995-11-23 Johannes Dr Ing Weber Profilwerkzeug zum Herstellen von Hohlprofilen mit mehr als einer Hohlkammer
NL9400937A (nl) * 1994-06-09 1996-01-02 Tech Ind W J Van Der Sar B V Werkwijze en inrichting voor het vervaardigen van een naadloos doorzichtig kokerprofiel.
US5567505A (en) * 1994-08-16 1996-10-22 Solvay (Soci et e Anonyme) Means and method of applying a plastic finishing layer to the surface of a composite article; coated composite article
WO1996038498A1 (fr) * 1995-05-29 1996-12-05 Hoechst Aktiengesellschaft Plaque coloree transparente amorphe en thermoplaste cristallisable, son procede de fabrication et son utilisation

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
"CONTINUOUS MOLDER EXTRUDES PET", MACHINE DESIGN, vol. 68, no. 4, 22 February 1996 (1996-02-22), pages 64, XP000556036 *
DATABASE WPI Section Ch Week 7612, Derwent World Patents Index; Class A23, AN 76-21759X, XP002048596 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006096898A2 (fr) * 2005-03-16 2006-09-21 Greiner Extrusionstechnik Gmbh Dispositif support pour un outil d'extrusion ainsi qu'outil d'extrusion permettant de faconner un article
WO2006096898A3 (fr) * 2005-03-16 2007-04-12 Greiner Extrusionstechnik Gmbh Dispositif support pour un outil d'extrusion ainsi qu'outil d'extrusion permettant de faconner un article
US7878792B2 (en) 2005-03-16 2011-02-01 Greiner Tool. Tec Gmbh Support arrangement for an extrusion tool and extrusion tool for moulding an object

Also Published As

Publication number Publication date
ITMI971728A1 (it) 1999-01-22
AU8110798A (en) 1999-02-16
IT1293748B1 (it) 1999-03-10

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