WO1990005626A1 - Procede et appareil pour fabriquer un element allonge - Google Patents

Procede et appareil pour fabriquer un element allonge Download PDF

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Publication number
WO1990005626A1
WO1990005626A1 PCT/SE1989/000652 SE8900652W WO9005626A1 WO 1990005626 A1 WO1990005626 A1 WO 1990005626A1 SE 8900652 W SE8900652 W SE 8900652W WO 9005626 A1 WO9005626 A1 WO 9005626A1
Authority
WO
WIPO (PCT)
Prior art keywords
matrix
compression
mixture
feeder
plastics material
Prior art date
Application number
PCT/SE1989/000652
Other languages
English (en)
Inventor
Curt Andersson
Original Assignee
Curt Andersson
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 SE8804156A external-priority patent/SE8804156L/xx
Priority claimed from SE8901782A external-priority patent/SE8901782L/xx
Application filed by Curt Andersson filed Critical Curt Andersson
Publication of WO1990005626A1 publication Critical patent/WO1990005626A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/22—Extrusion presses; Dies therefor
    • B30B11/24—Extrusion presses; Dies therefor using screws or worms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/28—Moulding or pressing characterised by using extrusion presses
    • 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
    • B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/375—Plasticisers, homogenisers or feeders comprising two or more stages
    • B29C48/38—Plasticisers, homogenisers or feeders comprising two or more stages using two or more serially arranged screws in the same barrel
    • 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
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/375—Plasticisers, homogenisers or feeders comprising two or more stages
    • B29C48/39—Plasticisers, homogenisers or feeders comprising two or more stages a first extruder feeding the melt into an intermediate location of a second extruder
    • 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
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/505—Screws
    • B29C48/625—Screws characterised by the ratio of the threaded length of the screw to its outside diameter [L/D ratio]
    • 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
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/68—Barrels or cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/22—Extrusion presses; Dies therefor
    • B30B11/224—Extrusion chambers
    • 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
    • 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
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts

Definitions

  • TITLE OF THE INVENTION A method for manufacturing an elongated member and apparatus for carrying out the method
  • the present invention relates primarily to a method of manufacturing an elongated member, and in particular to a method in the continuous manufacture of an elon ⁇ gated member from a compressible and compressed start ⁇ ing material.
  • the invention also relates to apparatus for the con ⁇ tinuous manufacture of an elongated member with the use of compressible starting material.
  • the invention also relates to the use of a plastics material, particularly a plastics-material mixture as the compressible material.
  • the elongated member is produced from separate, well-defined batches which are mutually separated by an interface or boundary region of mutually different degrees of compression and in which the fibre directions are also displaced relative to one another, to a certain extent, in the vertical plane. Hardening takes place in a heating section.
  • Swedish Patent Application 8804156-1 describes a method and apparatus for manufacturing an elongated member from a mixture of a plastics material and a filler, such as wood fibres, textile fibres and the like, by compacting the mixture when the plastics material is in a molten state.
  • 15 energy generated by compression is utilized to soften and/or to melt the plastic content of the mixture, at least at the end of the compression section.
  • a particularly challenging technical problem also ari ⁇ ses in realizing that the aforesaid technical problems can be solved when the plastic content of the starting mixture is precompacted in a molten or heated state, 3.0 and is then caused to solidify in a cooling section.
  • the starting material may comprise waste material, where plastic material is of significance, and of realizing that the plastic mate ⁇ rial and filler should be mixed in appropriate propor ⁇ tions, particularly when the filler is a finely divided fibrous material r such as wood-fibre material, so as to obtain a mechanically strong elongated member.
  • a particularly challenging technical problem also ari ⁇ ses in the ability to realize the possibility that when the filler comprises a wood-fibre material, such as wood chips (sawdust , cutter chips) , and has been heat- dried in a preceding operation, the filler can be mixed with plastic material immediately after being dried, and the mixture further heated, when necessary, so as to convert the plastic content of the mixture to a tacky or liquid state, prior to compacting the mixture and subsequent cooling thereof to form said elongated member.
  • a wood-fibre material such as wood chips (sawdust , cutter chips)
  • the present invention relates primarily to a method of manufacturing conti ⁇ nuously an elongated member from compressible and com ⁇ pacted material.
  • the compressible material used comprises a mixture of plastics material and filler, and the mixture with its plastic content preferably in a molten state, is deli ⁇ vered to a first space and compacted therein.
  • the com ⁇ pressed material is then pressed into another space, defined by a matrix mould, where the mixture is cooled so that the plastic content thereof will solidify.
  • the thermal energy generated during compression of the mixture is adapted so that the temperature of the plastic material will be sufficiently high to soften, preferably melt said material.
  • the mixture is compressed with the aid of a screw-feeder, by controlling the speed of the screw- feeder and/or providing the helix of the screw-feeder with a pitch which decreases towards the aforesaid second space, so as to achieve desired compression within the screw-feeder.
  • the mixture can be precompressed with the aid of a further screw-feeder, but preferably at different rotational speeds.
  • the further screw-feeder will preferably rotate at a higher speed than the first mentioned screw-feeder.
  • precompression screw-fee ⁇ der will be stationary in relation to one of the sec ⁇ tions of said matrix, namely one end-part of the upper matrix-section.
  • the plastic content of the plastic-material/filler mixture comprises bet ⁇ ween 20 and 60%, say between 30-50%, normally about 40% of the total material content.
  • the filler used is preferably a newly dried and heated fibrous material, whereas the plastics material used may be waste-plastic, domestic plastic waste or some like inexpensive material.
  • Means are preferably provided for cooling the part of the matrix located adjacent the extruder, preferably with the aid of water.
  • the matrix is divided into sections, which are capable of being displaced synchronously or asynch ⁇ ronously in relation to one another, along the outer surfaces of the elongated member during the manufacture thereof.
  • the invention also relates to an apparatus for the continuous manufacture of an elongated member, this apparatus comprising a compression device having a rotatable shaft arranged concentrically with a matrix mould, and being operative to press the mixture through the matrix.
  • the apparatus also includes a preco pressing device which delivers precompressed mixture to the compressing device.
  • the matrix sections embrace the elongated member during its manufacture, and one or more of the matrix sections are reciprocatingly movable.
  • the precompressing device coacts with one section.
  • the elongated member can be used as a nailing batten, in the manufacture of door and window frames or like structures, or can be cut into given, short lengths for use in the manufacture of loading pallets.
  • Figure 1 is a side view, partially in section, of a first apparatus constructed in accordance with the invention
  • Figure 2 is a simplified sectional view taken on the line II-II i Figure 1;
  • Figure 3 is a side view of a second embodiment of the inventive apparatus, which incorporates a compression section in the form of an extruder; and
  • Figure 4 illustrates schematically a nozzle mounted on the extruder and capable of being connected to a matrix, not shown in detail.
  • the reference 1 in Figure 1 identifies a known appara ⁇ tus with which a plastics material can be mixed with a filler and/or a reinforcing material.
  • the apparatus shall be capable of enabling the plastics material to be heated and brought preferably to a mol ⁇ ten state, and in all events, to a tacky state.
  • the proportion of plastics mate ⁇ rial contained in the mixture will be less than 50% and preferably about 10%.
  • the normal value in this respect will preferably lie between 20 and 50%, say about 40%.
  • the apparatus 1 includes precompressing device in the form of a screw conveyor, by means of which a mixture A of plastics material and filler is fed to a first space 3, through a passage 2.
  • the chamber 3 is conceived to be defined by the conically tapering shaft 4 and helix 8 of a further screw conveyor and also a tubular matrix 5 which embraces said conveyor.
  • the material A When leaving the pas ⁇ sage 2, the material A exhibits a degree of precompre- ssion which is commensurate with the pressure exerted on the mixture as it moves through the passage 2.
  • the mixture A is then compressed successively to a much greater degree of compression by the screw-conveyor and tubular matrix 5, and at a region referenced B down ⁇ stream of the first space 3 the plastics material pre- sent in the mixture will be either in a molten or a tacky state.
  • the pla ⁇ - tics material solidifies gradually and when the mixture has reached the position referenced C, it is assumed that the plastics material, and thus also the elongated member, will be essentially solid, and that in all events the plastic/filler mixture will have been com- pressed to its final degree of compression when it rea ⁇ ches the region of the apparatus referenced D, so as to form a finished elongated member or organ.
  • the precompressed plastic/filler mixture is moved by means of the screw-feeder 4,8 from the region B, where the plastic material begins to solidify, through the tubular matrix 5 and into the beginning of a third space 7. Compression of the mixture during its travel from region A to region B is effected with the aid of the screw-feeder 4, 8.
  • he helix 8 of the screw-feeder has a pitch which decreases in a direction towards the third space 7, thereby providing the advantage that the mix ⁇ ture can be caused to have a predetermined degree of compression by the time it reaches the region B, due to t e successive decrease in the pitch of the helix 8.
  • the screw-feeder comprising the conically tapering shaft 4 and helix 8, is rotated by means of drive means not shown.
  • Figure 2 is a cross-sectional view which illustrates a matrix of rectangular cross-section divi- ded into four sections 5a, 5b, 5c and 5d.
  • Each of these matrix sections is intended to coact with a hydraulic piston-cylinder device 15, the piston of which is reciprocatingly movable in the direction of the longitudinal axis of the elongated member 10.
  • the different matrix sections can either be moved synchro ⁇ nously or asynchronously.
  • the matrix section 5a and 5c are held in position with the aid of rollers 16, 17, which extend along the whole length of the matrix 5 and which are present'in numbers that will ensure that the rollers fullfil the function satisfactorily.
  • the matrix sections 5b and 5d are also held in position with the aid of -rollers, although not shown.
  • cooling passages are provided in the matrix sections 5a, 5b, 5c and 5d in a manner known per se. so that heat can be taken from the mix ⁇ ture in a controlled fashion and so that the mixture "will have a more solid form at the region C.
  • the piston-cylinder devices acting on the matrix sec ⁇ tions 5a, 5b, 5c and 5d, of which the device 15 acting on the section 5a is shown, can be operated to deliver a short or a long working stroke, so as to move respec ⁇ tive matrix sections through a commensurate axial dis- tance with each stroke performed by respective piston- cylinder devices, while at the same time enabling a full working stroke to be completed at different selec ⁇ ted times.
  • the filler material in the plastic/filler mixture charged to the first feeder and precompressed in the vertical passage 2 may comprise heated sawdust, and the heat given off by the sawdust is transmitted directly to the plastics material pre- sent in the mixture.
  • This mixture is then fed by the horizontal screw-feeder comprising said conically tapering shaft and helix, the pitch of which decreases in a direction towards the centre of the matrix 5, therewith compressing the mixture to a greater degree of compression.
  • the space beneath the tubular passage 2 may be heated with the aid of heating coils, as can also the walls of the passage itself.
  • the matrix sections will preferably be held parallel, when the volume of the plastic material decreases at low temperature. It lies within the scope of the inven ⁇ tion, however, to position the matrix sections so that the elongated member produced will not press against said sections with an unnecessarily high force.
  • the plastics material present in the mixture is tacky and/or molten when the mixture is located within the regions B and C. Consequently, it is necessary to bring the mixture to a temperature at which this criterion is achieved.
  • this temperature is controlled and held constant, by controlling the speed of the screw-feeder.
  • the heat required can be obtained and controlled through the temperature of the starting material and/or by external heating.
  • Figure 3 is a side view of a compression section in the form of an extruder 30 in which there is mounted an internal screw-feeder 31 which carries a nozzle 32 on one end thereof.
  • the nozzle 32 is shown schematically and in side-view in Figure 1.
  • the nozzle 32 has a flange 33, which is attached to the extruder 30, and a narrowing part 34, and an outlet 35.
  • the outer parts 36, 37 of the outlet 35 are surrounded by the matrix-sections 5a and 5c, which are recipro- ⁇ fcatingly movable in the manner aforedescribed with reference to Figure 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Adornments (AREA)

Abstract

Procédé et appareil pour fabriquer en continu un élément allongé (10) à partir d'une matière compressible. Une matière plastique est amenée dans un espace où elle est comprimée. La matière comprimée est pressée vers un second espace (7), défini par une matrice (5), où la matière (10) se solidifie. Les parois de la matrice (5) sont mobiles l'une vers l'autre. On obtient une partie au moins de l'énergie thermique requise pour amener la matière plastique à un état visqueux ou liquéfié en commandant la vitesse d'un dispositif d'alimentation à vis (4) qui fait partie du dispositif de compression.
PCT/SE1989/000652 1988-11-17 1989-11-10 Procede et appareil pour fabriquer un element allonge WO1990005626A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
SE8804156A SE8804156L (sv) 1988-11-17 1988-11-17 Saett att framstaella en laengstraeckt balk och anordning foer dess framstaellning
SE8804156-1 1988-11-17
SE8901782-6 1989-05-18
SE8901782A SE8901782L (en) 1989-05-18 1989-05-18 Method and appts. for making elongated member - involves thermal energy generated by compression adapted to bring plastic material to temp. sufficiently high to soften material

Publications (1)

Publication Number Publication Date
WO1990005626A1 true WO1990005626A1 (fr) 1990-05-31

Family

ID=26660355

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1989/000652 WO1990005626A1 (fr) 1988-11-17 1989-11-10 Procede et appareil pour fabriquer un element allonge

Country Status (2)

Country Link
AU (1) AU4508489A (fr)
WO (1) WO1990005626A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1238792A2 (fr) * 2001-01-13 2002-09-11 Karl Schedlbauer Procédé et dispositif d'extrusion en continu de profilés pleins ou tubulaires à partir de petits morceaux
EP1800831A3 (fr) * 2005-12-23 2008-07-16 Imal S.R.L. Appareil pour extruder des matériaux ligneux en vrac et procédé de pressage associé

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2304088A (en) * 1938-08-23 1942-12-08 Merrill G Hastings Apparatus for manufacturing filters
FR1589723A (fr) * 1968-09-06 1970-04-06
DE1778230A1 (de) * 1968-04-09 1972-01-20 Actien Ges Der Gerresheimer Gl Verfahren zur Herstellung von Profilkoerpern aus Polyaethylen
DE2304088A1 (de) * 1972-01-28 1973-08-23 Mitsubishi Heavy Ind Ltd Schneckenpresse zum strangpressen (extrudieren) nicht-aufschaeumbarer harze und verfahren zu ihrem betrieb
US4134714A (en) * 1977-04-18 1979-01-16 General Electric Company Multi-stage continuous plastic extrusion apparatus, and extrusion screw
SE410946B (sv) * 1978-02-15 1979-11-19 Akerlund & Rausing Ab Halprofil extruderad fran ett utgangsmaterial av polyolefin och papper samt forfarande for dess framstellning
SE415547B (sv) * 1978-09-15 1980-10-13 Andersson Kurt Goeran Anordning for framstellning av ett langstreckt organ
DE3412158A1 (de) * 1984-03-31 1985-10-03 Candid Neuenkirch Burkart Regelung einer im recyclingprozess arbeitenden extruderanlage und extruderanlage
US4626398A (en) * 1984-04-19 1986-12-02 Roehm Gmbh Chemische Fabrik Process for the production of extruded web multiple panel with undulated webs

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2304088A (en) * 1938-08-23 1942-12-08 Merrill G Hastings Apparatus for manufacturing filters
DE1778230A1 (de) * 1968-04-09 1972-01-20 Actien Ges Der Gerresheimer Gl Verfahren zur Herstellung von Profilkoerpern aus Polyaethylen
FR1589723A (fr) * 1968-09-06 1970-04-06
DE2304088A1 (de) * 1972-01-28 1973-08-23 Mitsubishi Heavy Ind Ltd Schneckenpresse zum strangpressen (extrudieren) nicht-aufschaeumbarer harze und verfahren zu ihrem betrieb
US4134714A (en) * 1977-04-18 1979-01-16 General Electric Company Multi-stage continuous plastic extrusion apparatus, and extrusion screw
SE410946B (sv) * 1978-02-15 1979-11-19 Akerlund & Rausing Ab Halprofil extruderad fran ett utgangsmaterial av polyolefin och papper samt forfarande for dess framstellning
SE415547B (sv) * 1978-09-15 1980-10-13 Andersson Kurt Goeran Anordning for framstellning av ett langstreckt organ
DE3412158A1 (de) * 1984-03-31 1985-10-03 Candid Neuenkirch Burkart Regelung einer im recyclingprozess arbeitenden extruderanlage und extruderanlage
US4626398A (en) * 1984-04-19 1986-12-02 Roehm Gmbh Chemische Fabrik Process for the production of extruded web multiple panel with undulated webs

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Vol. 11, No. 146, M587; & JP,A,61 279 524, publ. 1986-12-10, (JGC CORPORATION). *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1238792A2 (fr) * 2001-01-13 2002-09-11 Karl Schedlbauer Procédé et dispositif d'extrusion en continu de profilés pleins ou tubulaires à partir de petits morceaux
EP1238792A3 (fr) * 2001-01-13 2003-05-14 Karl Schedlbauer Procédé et dispositif d'extrusion en continu de profilés pleins ou tubulaires à partir de petits morceaux
EP1800831A3 (fr) * 2005-12-23 2008-07-16 Imal S.R.L. Appareil pour extruder des matériaux ligneux en vrac et procédé de pressage associé

Also Published As

Publication number Publication date
AU4508489A (en) 1990-06-12

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