EP2042283A1 - Procédé et dispositif destinés à la pression de tronçons de petites pièces, en particulier de petites pièces en bois contenant des liants - Google Patents

Procédé et dispositif destinés à la pression de tronçons de petites pièces, en particulier de petites pièces en bois contenant des liants Download PDF

Info

Publication number
EP2042283A1
EP2042283A1 EP07018878A EP07018878A EP2042283A1 EP 2042283 A1 EP2042283 A1 EP 2042283A1 EP 07018878 A EP07018878 A EP 07018878A EP 07018878 A EP07018878 A EP 07018878A EP 2042283 A1 EP2042283 A1 EP 2042283A1
Authority
EP
European Patent Office
Prior art keywords
strand
steam
steam injection
recipient
binder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP07018878A
Other languages
German (de)
English (en)
Inventor
Karl Schedlbauer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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
Application filed by Individual filed Critical Individual
Priority to EP07018878A priority Critical patent/EP2042283A1/fr
Publication of EP2042283A1 publication Critical patent/EP2042283A1/fr
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • 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

Definitions

  • the invention is directed to a method and an apparatus for the production of strands, which consist of a mixture of vegetable small parts and binders mixtures from which, for example, pallet blocks are cut.
  • the invention has for its object to provide solutions by which it is possible to produce extruded profiles with favorable structural structure in an advantageous developable under procedural aspects with a significantly reduced demand for vaporous H 2 O.
  • the object is achieved by a method having the features specified in claim 1.
  • the invention is based on the following findings:
  • the gelling time of commercially available, water-resistant glues such as Kauramin 630 or 410 from the company. Basf in Ludwigshafen, have at a temperature of 100 ° C a gel time of about 45 s in a hardener type 29 (powder).
  • the gelling times of these glues for other temperature ranges are approximated below: temperature gelling 80 ° C 740 s 90 ° C 360 s 95 ° C 198 s 97 ° C 135 s 98 ° C 105 s 99 ° C 74 s 100 ° C 45 s 140 ° C ⁇ 3 s 160 ° C ⁇ 2 s
  • the above teachings are currently producing strands from which pallet blocks are sawn.
  • the smallest cross-section is about 50x80 mm, the largest at 142x142 mm or 157x97 mm.
  • As a chip material are predominantly pencil shavings with a cross section of up to about 5 mm 2 of fresh or old wood, preferably from spruce or Pine used.
  • Sawdust or wood shavings as well as fine chips only serve as filling material in small quantities. However, the proportion of the latter is kept as low as possible and will no longer be used to any appreciable extent in the foreseeable future, since these form the ideal material for pellet production.
  • the pin chips are kept as large as possible in cross-section, since this reduces the shredding costs.
  • the invention therefore teaches abruptly, in a very short time, to introduce so much H 2 O into the strand that substantially the glue droplets and possibly the thinnest possible edge zone of the chips are brought to a temperature of over 180 ° C., which Glue quickly, so in less than 2 seconds gelieren.
  • a favorable steam temperature a range of up to about 200 ° C has been found in experiments.
  • the glue consists of about 1 part of water and 2 parts of solids. If it is heated by the steam to over 100 ° C, the water contained in it evaporates and condenses in the chips.
  • the strand has after the gelling of the glue sufficient strength to cut and stack it. His final strength, however, he reached only after cooling to about ambient temperature.
  • the glue Due to the fact that the water contained in the glue was suddenly vaporized by the indicated vapor, the glue also gelled in a time of less than 2 seconds.
  • the energy supplied to the strand by the steam injection concentrates very substantially on the glue droplets over the gelling period and at most penetrates into a very thin surface layer of the chips.
  • the heated edge layer of the chips during the steam injection is all the thinner the faster the energy required for the heating of the strip is supplied. In practice, this essentially depends on the switching times of the steam valves. Therefore, the use of hot water has proven to be particularly advantageous, which evaporates only after the valves.
  • the steam injection can be done just as advantageous from the inside, ie from the hollow mandrel, as well as from the outside through the inner boundary walls of the recipient.
  • a recipient of professionals is called the assembly of an extruder in which the shaping takes place. Wood extrusion presses have no pressing nozzle. The recipient is thus the assembly in which the chips are compacted, formed into a strand and transported around the ejection stroke.
  • the entry velocity of the vapor into the strand is at least about 200 m / s to about the speed of sound (in air at 180 ° C.
  • the steam injection can be done at any time in the press cycle, preferably while the strand is not moving.
  • the time of the steam injection may be less than about 0.05 to within the range of more than 1 second, depending on what amount can be discharged in the time unit of the steam train.
  • two to four bursts of steam have been found. It could be surprisingly found in experiments that thereby reduces the total steam consumption, since, especially in the outer zone of the strand, little steam in the edge zone, the small parts (chips) penetrates.
  • the method according to the invention can be used with all known devices for extruding small vegetable parts, in particular wood small parts with binders, but particularly advantageously with the device described below.
  • the recipient and the subsequent rigid channel also called Vorforminggang, separate assemblies. These are advantageously combined by the invention to form an assembly.
  • the H 2 O is injected into the strand at a length between the discharge stroke of the press and twice that.
  • the steam entry begins, as usual, before the foremost position of the ram.
  • the performance of today's extruders is about 5.2 m / min, from high-performance presses to about 10 m / min. Since the binder gels in less than 2 s and the strand then has sufficient strength, it is generally sufficient to form the recipient in a length of up to about 200 to 1500 mm after the end of the steam injection.
  • the invention provides for the steam input from the walls of the recipient both the known holes (holes) in a diameter range of about 1 to about 5 mm before, as well as narrowest slits such as on the peripheral surface of recessed keys.
  • Conventional extrusion presses have a press stroke length of about 650 to 750 mm and at a compression of 1: 4 an output / stroke of about 162.5 to about 187.5 mm. This results in a length of the recipient incl.
  • the invention provides, at least one part of the recipient, but preferably to manufacture the base plate and the side plates in one piece and to mount in or on these the wear parts and the other components.
  • the advantage of this design is that in a simple manner high accuracy of the inner mold is achieved, which is essential for the safe operation of the press in terms of compression. Further, the invention teaches to build at the end of the recipient a braking device for controlling the compaction of the strand into or onto it.
  • the braking device according to the invention consists of at least one, but preferably two brake plates, which are embedded in the recipient at the discharge end. They are pressed by force transmitters, such as hydraulic cylinders, against the strand, such that the force is adjustable and the height of the friction is determined by the density of the strand.
  • an adjustable, constant pressure against the strand is sufficient.
  • a degassing zone can be provided.
  • the saw for cutting the bar e.g. in pallet blocks should not be immediately after the press but at a distance of at least a half to a few meters.
  • the invention provides a simple guidance in a housing between the recipient and the saw, from which leaking gases and vapors can be sucked out. In practice, it can not be ruled out that a proportion of the substances released during gelling does not completely condense in the strand.
  • the suction and guide device according to the invention is designed to be pushed off or easily disassembled, so that the recipient can be easily and quickly pulled out of the press trusses in a repair or a new documents with wearing parts.
  • a longitudinally movable mounting of the suction and guide device on rollers is of particular advantage here, since when removing the recipient, this can be stored on supports with rollers.
  • Fig. 1 a section through an extrusion press.
  • FIG. 2 a section on the line I - I according to Fig. 1 ,
  • FIG. 3 a section on the line II - II according to Fig. 1 ,
  • Fig. 1 shows a section through an extrusion press.
  • the uncompressed mixture 1 passes, in the embodiment by a trough chain conveyor 2, through the passage opening 3 of the closing slide 4, in the filling and pressing chamber 5 of the recipient 6. In this it is compressed by the ram 7 and in the direction of the saw 8 to the discharge stroke transported.
  • the ram 7 is shown in its front end position, the closing slide 4 in the closed state.
  • the steam injection takes place in the embodiment through narrow slots 9 or through holes through the wear plates 10.
  • the distance of the steam injection in measure 11 can be from just simple to about double the ejection stroke, the period of the steam injection is as short as possible, in a range of less than approx 0.05s to about 1s or above.
  • the steam injection should be done in the shortest possible time. It is advantageous, instead of a longer injection time, for example, over 0.4 s, to introduce the required steam in several very short bursts of about 0.02 to about 0.2 s.
  • the glue is set in less than 2s after the steam injection, it is therefore sufficient for a subsequent length of the recipient in the measure 12 of about 200 to about 1500 mm.
  • the stroke of the ram in the dimension 13 is usually about 650 to about 750 mm.
  • the invention provides one or more distributed around the rod 16 , brake plates 15 before. They are so from the associated force transmitter 16, eg a hydraulic cylinder, pressed against the strand 16 that the rod 16 receives the desired density via the friction. In general, an adjustable, continuous pressure against the strand 16 is sufficient. However, it is quite advantageous if, during the discharge stroke of the extruder, a lower force across the strand 16 acts as a braking force in a known manner than during the strand downtime.
  • the invention provides a degassing hood 17 . From it are extracted from the strand escaping gases, such as formaldehyde. In her, the strand 16 is guided in simple guide rails 18 and it is for example mounted on rollers 20 longitudinally displaceable. Between the degassing hood 17 and the saw 8 , the invention provides a seal 22, for example a bellows. Sand adheres to the small parts, which leads to a wear of the inner walls of the recipient 6 . They are therefore armored with wear plates 10 , which must be replaced after a few months. In order to be able to carry out this as simply as possible, the invention supports the degassing hood 17 and the recipient 6 on rollers 20.
  • the seal 22 for example a bellows. Sand adheres to the small parts, which leads to a wear of the inner walls of the recipient 6 . They are therefore armored with wear plates 10 , which must be replaced after a few months.
  • the degassing hood is separated from the recipient 6 and moved in the direction of the saw 8 . Subsequently, the recipient can be pulled out of the traverses 21 .
  • the invention provides to heat the recipient 6 in the region of the steam outlet.
  • the heating can have both a tempering task, as well as to overheat the steam or to produce it from water first. Particularly advantageous is the use of hot water, which penetrates the passage of the narrow slits or holes 10 almost explosively in the strand and allows shortest injection times.
  • Fig. 2 treats a cut on the line II according to Fig. 1 ,
  • the steam or the hot water pass from the screw 23 into the distribution chamber 24 and penetrate through the narrow slots 10 in the strand 16.
  • the narrow slots can advantageously be used holes in a diameter range of about 1 to about 5 mm.
  • the steam injection takes place at the same time from the inside, through the hollow mandrel 25 , which is also provided with narrow slots or holes 10 . It is also possible that the steam injection takes place exclusively through the hollow mandrel 25 .
  • the recipient is sealed in the usual way against gas leakage to the outside.
  • Fig. 3 treated a section on the line II-II gem.
  • Fig. 1 In the embodiment, 2 brake plates 15 are pressed by force transmitter (hydraulic cylinder) 17 against the strand 16 and determine the friction generated by the compression and thus the density of the strand 16.
  • force transmitter hydraulic cylinder
  • two brake plates 15 can be just as advantageous, especially for rectangular strand sections only one brake plate 15 are used. For round or polygonal cross sections, the use of a plurality of brake plates 15 is provided.
  • Fig. 4 shows a longitudinal section through an extruder.
  • 4 zones for steam injection 26 are formed. From these, the steam, for example, from holes 27 in a diameter range of about 1 to about 5 mm, succeeded in several very short intervals of less than about 0.02 to about 0.2 s in the strand, or in a single burst of steam.
  • the dimension 28 between the first and the last steam injection zone 29 can be up to about 4 m.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
EP07018878A 2007-09-26 2007-09-26 Procédé et dispositif destinés à la pression de tronçons de petites pièces, en particulier de petites pièces en bois contenant des liants Withdrawn EP2042283A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07018878A EP2042283A1 (fr) 2007-09-26 2007-09-26 Procédé et dispositif destinés à la pression de tronçons de petites pièces, en particulier de petites pièces en bois contenant des liants

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07018878A EP2042283A1 (fr) 2007-09-26 2007-09-26 Procédé et dispositif destinés à la pression de tronçons de petites pièces, en particulier de petites pièces en bois contenant des liants

Publications (1)

Publication Number Publication Date
EP2042283A1 true EP2042283A1 (fr) 2009-04-01

Family

ID=39106342

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07018878A Withdrawn EP2042283A1 (fr) 2007-09-26 2007-09-26 Procédé et dispositif destinés à la pression de tronçons de petites pièces, en particulier de petites pièces en bois contenant des liants

Country Status (1)

Country Link
EP (1) EP2042283A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10153193A1 (de) * 2001-10-29 2003-05-08 Karl Schedlbauer Verfahren und Vorrichtung zum Aushärten von Strängen aus Kleinteilen mit Bindemitteln nach einer Strangpresse
DE10316119A1 (de) * 2003-04-09 2004-11-04 Karl Schedlbauer Verfahren und Vorrichtung zum Aushärten von Strängen aus Kleinteilen mit Bindemitteln nach einer Strangpresse
DE202004017536U1 (de) * 2004-11-11 2006-03-16 Anton Heggenstaller Ag Strangpresse für mit Bindemittel vermengte pflanzliche Kleinteile
EP1752267A2 (fr) * 2005-08-10 2007-02-14 Anton Heggenstaller GmbH Procédé pour la fabrication de produits extrudés et presse d'extrusion
EP1752268A2 (fr) * 2005-08-10 2007-02-14 Karl Schedlbauer Méthode et appareil pour réaliser des cordons de densité egale et pour durcir des cordons en copeaux végétaux
DE102005037765A1 (de) * 2005-08-10 2007-02-15 Karl Schedlbauer Verfahren und Vorrichtung zum Aushärten von Strängen nach einer Strangpresse

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10153193A1 (de) * 2001-10-29 2003-05-08 Karl Schedlbauer Verfahren und Vorrichtung zum Aushärten von Strängen aus Kleinteilen mit Bindemitteln nach einer Strangpresse
DE10316119A1 (de) * 2003-04-09 2004-11-04 Karl Schedlbauer Verfahren und Vorrichtung zum Aushärten von Strängen aus Kleinteilen mit Bindemitteln nach einer Strangpresse
DE202004017536U1 (de) * 2004-11-11 2006-03-16 Anton Heggenstaller Ag Strangpresse für mit Bindemittel vermengte pflanzliche Kleinteile
EP1752267A2 (fr) * 2005-08-10 2007-02-14 Anton Heggenstaller GmbH Procédé pour la fabrication de produits extrudés et presse d'extrusion
EP1752268A2 (fr) * 2005-08-10 2007-02-14 Karl Schedlbauer Méthode et appareil pour réaliser des cordons de densité egale et pour durcir des cordons en copeaux végétaux
DE102005037765A1 (de) * 2005-08-10 2007-02-15 Karl Schedlbauer Verfahren und Vorrichtung zum Aushärten von Strängen nach einer Strangpresse

Similar Documents

Publication Publication Date Title
EP1066138B1 (fr) Procede et dispositif permettant de fabriquer un materiau profile
EP0376175B1 (fr) Procédé et dispositif pour contrôler la compression et/ou pour créer une zone marginale avec une surface modifiée pendant l'extrusion de particules, notamment de particules végétales avec des agents liants
DE102010012838B4 (de) Vorrichtung zur Herstellung von Presskörpern
DE2253121A1 (de) Verfahren und vorrichtung zur herstellung von formkoerpern, bzw. profilen aus abfallprodukten pflanzlicher faserstoffe
EP1925413B1 (fr) Procédé et dispositif d'extrusion destinés à la fabrication de produits d'extrusion
EP2159024B1 (fr) Procédé et appareil de fabrication d'un corps en matière dérivée du bois
DE10245284A1 (de) Verfahren und Vorrichtung zum Strang- und Strangrohrpressen von Kleinteilen, insbesondere Holzkleinteilen, z.B. für Palettenklötze
DE102006055116B4 (de) Verfahren und Strangpressanlage zum Herstellen von Strangpressprodukten
EP2042283A1 (fr) Procédé et dispositif destinés à la pression de tronçons de petites pièces, en particulier de petites pièces en bois contenant des liants
EP0638401B1 (fr) Procédé et dispositif pour extruder des profils, en particulier pour extruder des tubes à partir d'un mélange de copeaux végétaux et de liants
EP1752267B1 (fr) Presse d'extrusion
EP1198331B1 (fr) Procede pour extruder des petites pieces vegetales
DE10316119B4 (de) Verfahren und Vorrichtung zur Herstellung eines Strangpressprofiles
DE19854533A1 (de) Verfahren und Vorrichtung zum kontinuierlichen Strang- und Strangrohrpressen von Kleinteilen
DE10361837B4 (de) Vorrichtung und Verfahren zur kontinuierlichen Herstellung von Platten, Balken, Profilen oder ähnlichem aus Matten von Spänen und/oder Fasern
DE10245285A1 (de) Verfahren und Vorrichtung zur Verringerung des Pressdruckes und zur Steuerung der Verdichtung beim Strang- und Strangrohrpressen
DE10153193A1 (de) Verfahren und Vorrichtung zum Aushärten von Strängen aus Kleinteilen mit Bindemitteln nach einer Strangpresse
EP1752268A2 (fr) Méthode et appareil pour réaliser des cordons de densité egale et pour durcir des cordons en copeaux végétaux
DE102006037285A1 (de) Verfahren und Vorrichtung zum Erzielen einer gleichhohen Strangdichte und zum Aushärten von Strängen aus pflanzlichen Kleinteilen
DE10153195A1 (de) Verfahren und Vorrichtung zum Aushärten von Strängen aus Kleinteilen mit Bindemitteln nach einer Strangpresse
DE4444353A1 (de) Verfahren und Vorrichtung zur Herstellung von Röhrenplatten und Streifen, mit besonders geringer Verdichtung, aus Kleinteilen mit Bindemitteln
DE102006032149A1 (de) Verfahren und Vorrichtung zum Erzielen einer gleichhohen Verdichtung beim Strangpressen von pflanzlichen Kleinteilen
DE102012001293B4 (de) Verfahren und Presse zur Herstellung eines Holzwerkstoff-Formteils
EP0718079A1 (fr) Procédé et dispositif pour la fabrication de panneaux et bandes tubulaires
DE202013012197U1 (de) Presse für die Herstellung eines Holzwerkstoff-Formteils

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA HR MK RS

AKX Designation fees paid

Designated state(s): AT BE BG CH CY CZ LI

REG Reference to a national code

Ref country code: DE

Ref legal event code: 8566

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20091002