EP1752268A2 - Méthode et appareil pour réaliser des cordons de densité egale et pour durcir des cordons en copeaux végétaux - Google Patents

Méthode et appareil pour réaliser des cordons de densité egale et pour durcir des cordons en copeaux végétaux Download PDF

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Publication number
EP1752268A2
EP1752268A2 EP06016637A EP06016637A EP1752268A2 EP 1752268 A2 EP1752268 A2 EP 1752268A2 EP 06016637 A EP06016637 A EP 06016637A EP 06016637 A EP06016637 A EP 06016637A EP 1752268 A2 EP1752268 A2 EP 1752268A2
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EP
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Prior art keywords
strand
filling
pressing
length
mandrel
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EP06016637A
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German (de)
English (en)
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EP1752268A3 (fr
Inventor
Karl Schedlbauer
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Publication of EP1752268A2 publication Critical patent/EP1752268A2/fr
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    • 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 Pallet blocks with standard pallets have a height of 78 mm.
  • the invention is therefore an object of the invention to provide a method by which full strands and strands can be made with holes that have the desired surface and have the same length equal or approximately equal height over the strand length.
  • the devices should be so executable that they can be manufactured with relatively simple machine tools.
  • the invention therefore builds a press as follows:
  • the filling and pressing space is preferably carried out with easy-to-manufacture parallel walls.
  • the invention provides a lower than usual, wedge-shaped or stepped extension to the first steam entry point or to the pressing nozzle in a degree of up to about 1.5% of the strand transverse dimension.
  • the known first section of the curing channel usually about 1.5 to 1.7 m in length, is replaced by a very short rigid zone heating zone. Their length is approximately equal to or about six times greater than the length of the strand section formed with each pressing stroke. In this heating zone, the heating of the strand is carried out by steam.
  • the steam is introduced from the outer walls of the heating zone in the strand.
  • the heating zone is heated by an electrical resistance heater or by hot water or heat transfer oil.
  • the H 2 O can be fed into the walls of the heating zone both as steam, with sufficient heating, as well as water, wherein the steam is formed only in the walls.
  • the advantage of the latter embodiment of the invention is that no steam boiler has to be operated with the known high operating costs and safety requirements.
  • the invention combines the heating zone with the filling and pressing space and indeed in its closed area, following the inlet opening. In contrast to extrusion presses, eg for metals, it is not possible to speak of a press nozzle when extruding wood chips, since a nozzle always means a constriction.
  • the closed area of the filling and pressing space is usually according to DE 29 32 406 performs and has a length of about 300 to 400mm. He is usually provided with a cooling, which had no practical but only a patent-legal cause.
  • the inventive length of the closed part of the filling and pressing space has a degree of The approximately simple to about six times the strand length. It is preferably carried out with parallel inner walls. Of advantage, however, may be a very small wedge-shaped extension of up to about 1 ⁇ 2%.
  • the closed part is heated more intensively than usual. Its temperature can be up to about 240 ° C, instead of the previous about 160 ° C.
  • the heating can be done both by thermal oil which circulates in turbulent flow through holes, as well as by an electrical resistance heater. Due to the higher temperature and / or. The intense heat input through the turbulent flow of the thermal oil results in the desired greasy surface.
  • Another advantage of the heating of the closed part of the filling and pressing space is that virtually no or only a little wear occurs.
  • the binder contains grease or paraffin, which, as soon as the surface of the strand is heated, emerges from it, reduces friction and virtually forms a protective layer against wear, which is constantly renewed. It may be structurally quite advantageous to divide the closed part of the filling and pressing space transversely to the pressing direction or to manufacture in two sections.
  • the steam input is introduced compared to the previous teachings in a much shorter distance, which is at best just short of the length of the strand formed with each pressing stroke strand section.
  • a length of about 1/5 to about 9/10 of the Strangteil consortium has proven.
  • the closed part of the filling and pressing space is generally carried out with parallel boundary walls.
  • a wedge-shaped extension of up to about 1 ⁇ 2% of the strand transverse dimension may be advantageous, in particular in the processing of waste wood chips.
  • the steam entry into the strand can be done both continuously and intermittently, during the strand standstill in the press cycle.
  • the H 2 O may be supplied to the mandrel as water if it has sufficient heating, or as steam in an external steam boiler.
  • the pressing die moving over the mandrel does not run completely evenly, but transmits certain shocks during compression of the strand and in the transition from static friction to gel friction as the strand starts to move. Surprisingly, these shocks cause, in particular when the mandrel is provided with a sliding layer, e.g. Nanocoated, no limescale deposits on the drill holes.
  • a heated mandrel can therefore be operated with tap water and no distilled water is required, which simplifies the operation of the device and reduces product costs.
  • the average hole diameter in the sintered metal covers may be about 5 ⁇ m to about 100 ⁇ m.
  • the material can be sintered bronze or stainless steel.
  • the invention uses sintered metal rings, preferably of stainless steel, or manufactures the mandrel head from which the vapor exits from sintered metal, with metal guide rings, To prevent abrasion and a front seal, so that no steam enters the spike hole.
  • the saw-side end of the sintered metal head can be made so thick that the steam diffuses completely through the lateral surface.
  • a ram head is mounted on the ram piston rod.
  • the press piston rod is hollow drilled and moves into the filling and pressing space.
  • the mandrel protrudes through the bore of the pressing piston rod. Since the mandrel is heated in the invention by the flowing steam, it gives off its heat to a considerable extent on the pressing cylinder. This leads to an energy loss and reduces the life of the cylinder seals. The energy must be dissipated by the hydraulic oil.
  • the invention uses a standard profile tube as a press die, for example. gem. DIN EN 10210 on which it assembles the press die head.
  • the ram is guided by a suitable linear guide, and driven by a hydraulic cylinder.
  • the mandrel protrudes through the ram and is located at a suitable location, e.g. attached to the press frame. It is of no particular disadvantage when the ram is heated by the mandrel. Due to the dimensions, however, it is possible in a simple manner to isolate the press ram against the mandrel for energy saving.
  • the mandrel is formed in an advantageous embodiment so that it is adjustable in its position in the press or strand in the pressing direction, e.g. through a screw thread.
  • the invention makes the mandrel longitudinally adjustable in order to be able to vary the region of the steam outlet in the pressing direction.
  • the optimum position of the rearmost steam outlet opening is in a range between approximately half the strand transverse dimension and approximately six times the length of a strand section. It is determined by experiment, since they depend on strand and dome cross section and the state of wear of the filling and pressing chamber. The optimum position can change during the operation of the press and is corrected later. In it, the punch needs the least force to compact the strand to the desired value.
  • the length of the steam outlet region from the mandrel is about 1/5 to about 9/10 of the length of a strand section.
  • Holes with holes are generally heated by vapor injection from the mandrel to a setting temperature of up to about 100 ° C.
  • a setting temperature of up to about 100 ° C.
  • the introduction of steam can be carried out both continuously and discontinuously, and in an equally advantageous manner, with interruptions in the press cycle.
  • a discontinuous steam injection the control of the amount of steam over time, with a continuous on the vapor pressure and / or a flow rate control.
  • the setting channel following in the pressing direction essentially has the task of maintaining the glue residue during the gelling process of the binder and of cushioning interfering influences of the traveling saw.
  • the strand density is determined by him in a known manner.
  • one of its angles or subshells is tensioned by e.g. Hydraulic cylinder, pressed with less force against the strand than during the movement of the strand.
  • the lower force determines the strand density and is either adjusted by a pressure relief valve or the setting is computer determined.
  • the strand density is measured by a measuring device before or after the saw and a computer determines the lower force. Equally advantageously, it is possible to dispense with a high and a low pressure and to work with an adjustable pressure.
  • the setting range can be kept shorter in length than previously known. For a press capacity of approx. 60,000 pieces of pallet blocks of 78 mm height per 24 hours, a length of approx. 3 meters is generally sufficient. For high performance presses of 120,000 or more blocks per 24h, a length of 6 meters or more is chosen.
  • the setting channel has only one tempering task. He therefore no longer supplies the strand with heat, but essentially keeps it at its attained temperature. Since the presses work in full time, so are turned off only for maintenance and repair purposes, can be dispensed with a heating. It is only a very good insulation necessary to keep the heat losses as low as possible.
  • the invention for weight relief on train acting gas springs before. After the Abbindekanal the strand is sufficiently dimensionally stable and can be cut to length by a saw.
  • the suction of the saw works with a suction, which works with a negative pressure of approx. 08 to 0.9 bar. This vacuum is sufficient to allow the condensed H 2 O to evaporate. It is in contrast to prior art teaches no vacuum device required. Of course, the invention provides just as advantageous a separate suction with a conventional negative pressure of about 08, to about 0.9 bar before. Likewise, a vacuum device is conceivable and advantageous.
  • the press die 3 is in its front end position 4.
  • the mixture passes in the embodiment of an inlet shaft 5 in the filling and pressing chamber 6 and is compressed by the ram 3 and in the closed part 7, this also represents the heating zone 8 , the filling and pressing chamber 6 transported.
  • It is heated in the embodiment by thermal oil, which flows in turbulent flow through the holes 9 , intensive and with high heat output to a higher temperature than usual, of up to about 240 ° C.
  • the strand 1 acquires the greasy surface desired by the users.
  • Strand 1 is heated to its setting temperature of up to about 100 ° C, essentially by H 2 O.
  • the H 2 O penetrates from the steam holes 10 in the strand 1. It can be supplied to the closed part of the filling and pressing chamber 7 as water and is evaporated in this in, or as a steam from a boiler. With each pressing stroke a strand section 11 is produced with the length in the measure 12 and connected to the generated in the forward stroke.
  • the inlet region 13 of the filling and pressing chamber 6 or the region in the dimension 14 to the first steam outlet opening 15 is preferably formed with parallel boundary walls 16. To reduce the friction, however, it may be advantageous to wedge it in the pressing direction or step by step by up to about 1.5%.
  • the closed part 7 of the filling press room 6 is also generally carried out with parallel boundary walls 16 .
  • the degree of extension can be up to 1 ⁇ 2% of the strand cross dimension 17th
  • the number of stages may be up to about 4.
  • the extension can also be advantageously carried out only in the region of the steam outlet 18 in the dimension 19 and the subsequent area with parallel boundary walls 16 are performed.
  • the heating of the strand happens almost abruptly and essentially by the release of the heat of condensation of the penetrated vapor to him.
  • the H 2 O is introduced in a length of dimension 19 of about 1/5 to about 9/10 the length of a strand section 11 in the measure 12 in the strand.
  • the invention aims to ensure that a strand section in each case about the length of a strand section is brought to its setting temperature of up to about 100 ° C.
  • the length in the dimension 22 of the closed part 7 of the filling and pressing space or the heating zones is between about simple and six times the length of a strand section 11 in dimension 12th At the level of the last steam outlet 23 , the strand has reached its setting temperature of up to about 100 ° C.
  • the invention provides a Abbindekanal 25 before.
  • the setting zone 26 can be kept shorter in length than previously known. For a press capacity of approx. 60,000 pieces of pallet blocks of 78 mm height per 24 hours, a length of approx. 3 meters in dimension 27 is generally sufficient. For high-performance presses of 120,000 or more blocks per 24 hours, a length of 6 meters in dimension 27 or more is selected.
  • the binding channel 25 regulates via the force generator 28, the strand density.
  • the movable angle 29 or the movable part shell is pressed by the force transmitter 28, for example hydraulic cylinder, with a lower force against the strand than during the movement of the strand.
  • the lower force determines the strand density and is either adjusted by a pressure relief valve or the setting is computer determined.
  • the strand density is measured by a measuring device 30 before or after the saw and a computer determines the lower force. Equally advantageously, it is possible to dispense with a high and a low pressure and to work with an adjustable pressure.
  • Fig. 2. shows a cross section on the line II gem.
  • Fig. 1. The closed part 7 of the filling and pressing chamber 6 is heated in the embodiment by thermal oil circulating through holes 9 in turbulent flow. From the supply line 31 H 2 O passes in the form of water that evaporates in the holes 32 , or steam through the steam outlet openings 33 in the strand 1.
  • the size of the steam outlet openings may be in the dimension 34 to about 4 mm without clogging by abrasion were determined from the strand 1 .
  • the number of steam outlet openings 33 depends on the cross section of the strand 1 and is chosen so that the most uniform possible penetration takes place with steam.
  • Fig. 3. shows a cross section on the line II gem.
  • the steam is introduced from the bores 32 via the connecting bores 35 through sintered metal elements 35 into the strand 1.
  • the mean hole diameter in the sintered metal elements 35 can be between 5 .mu.m and 100 .mu.m.
  • the material of the sintering elements 35 may be sintered bronze or stainless steel or a wear resistant material. The advantage of these sintered elements 35 is that even in the processing of waste wood, no blockages are to be expected. Next there is a completely uniform distribution of the steam in the strand 1 and it can be observed even with larger cross sections no water seepage.
  • the sintered metal elements 35 may be formed as discs or rectangles or feather keys similar to DIN 6885 or in other advantageous Forman.
  • Fig. 4. a cross section on the line II-II gem. Figs. 1 and treats the Abbindekanal 25. He may in contrast to prior channel devices are very simple, as it has in the embodiment does not have heating.
  • the strand 1 is tempered in his area only, that is, he must maintain its temperature reached in about to bind quickly.
  • the movable angle 29 and the fixed angle 36 are bent from a stronger sheet. A seal is not required.
  • the heating angle is pivoted about the axis 37 in case of disturbances.
  • the invention selects train-operated gas springs 38.
  • Fig. 5. shows a longitudinal section through an extrusion press.
  • the embodiment deals with the extrusion of strands with a hole.
  • the hole 39 is created by the mandrel 40 .
  • the steam flows from the line 41 through the hollow mandrel 40 and penetrates via the steam outlet openings 33 in the strand 1.
  • the H 2 O can be introduced as water in mandrel 40 . It is brought by the heater 42 in a vaporous state of aggregation and penetrates as steam from the steam outlet holes in the strand 1 a.
  • the H 2 O is introduced in a length of dimension 19 of about 1/5 to about 9/10 the length of a strand section 11 in the measure 12 in the strand.
  • the invention aims to ensure that a strand section in each case about the length of a strand section is brought to its setting temperature of up to about 100 ° C.
  • the fact that the distance between the press-side strand end 20 in dimension 21 is about half to about five times the length of a strand section 11 in the measure 12 will be that when compacting a strand section have occurred in the subsequent strokes of the press ram 3 eliminated and the extruder produces strands with over their length completely or approximately completely the same density.
  • the press ram 3 is guided by the linear guide 43 and driven by a linear drive, usually a hydraulic cylinder.
  • the mandrel 40 protrudes through the press die 3. It can be isolated against the hot mandrel 40 .
  • the mandrel 40 is, in the exemplary embodiment by a screw thread 44 and nuts 45 longitudinally adjustable to adjust the ideal position of the region of the steam outlet 18 in the closed part 7 of the filling and pressing chamber 6 .
  • only the front part 46 of the closed part 7 of the filling and pressing chamber 6 is heated.
  • the rear part 47 remains unheated and can be optionally cooled.
  • the H 2 O penetrates the strand and condenses, it precipitates as water in the area of the rear part 47 in the outer edge layer 48 of the strand 1 .
  • the invention produces a particularly smooth and higher-density edge layer when the water evaporates on reaching the front part 46 again .
  • the Abbindekanal 25 is heated and the strand is to be completely or partially withdrawn the condensed water in it.
  • the strand is supplied at least a portion of the heat of vaporization of the condensed water.
  • the strand temperature does not increase beyond the ambient evaporation temperature of water.
  • the entire area from the filling and pressing chamber 6 to the revolving saw 24 is sealed in a known manner.
  • the pressure-tight connection from the Abbindekanal 25 to the follower saw 24 is made for example by a telescoping tube or a bellows 49 .
  • the suction of the saw works with a suction 50, which operates at a negative pressure of usually about 08 to 0.9 bar.
  • Fig. 6 shows a partial view of a mandrel.
  • the front surface 52 of the mandrel 40 is closed. It is hollow and on its peripheral surface, the steam outlet openings 33 are introduced as holes.
  • the distance between the holes to each other can be between 10 and 50 mm, their diameter can be up to about 4 mm.
  • Fig. 7 shows a partial view of a mandrel.
  • the front surface 52 of the mandrel 40 is closed. It is hollow and on its peripheral surface recess 53 and holes 54 are introduced.
  • DeH 2 O diffuses through the sintered metal rings 55 into the strand. This embodiment of the invention ensures a particularly uniform heating of the strand and also prevents the processing of waste wood, blockages.
  • FIG. 8 shows a view of a dome head 56 made of sintered metal.
  • the invention proposes as wear protection, the metal rings 57 , which may be nitrided.
  • the mean hole size of the sintered metal may be about 5 ⁇ to about 100 ⁇ .
  • the bore 58 is held so short that the H 2 O does not exit from the front surface 52 but from the peripheral surface 59 .

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Press Drives And Press Lines (AREA)
EP06016637A 2005-08-10 2006-08-09 Méthode et appareil pour réaliser des cordons de densité egale et pour durcir des cordons en copeaux végétaux Withdrawn EP1752268A3 (fr)

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DE10537765 2005-08-10

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EP1752268A2 true EP1752268A2 (fr) 2007-02-14
EP1752268A3 EP1752268A3 (fr) 2009-01-21

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2042283A1 (fr) * 2007-09-26 2009-04-01 Karl Schedlbauer Procédé et dispositif destinés à la pression de tronçons de petites pièces, en particulier de petites pièces en bois contenant des liants
DE202009012239U1 (de) 2009-09-11 2011-01-20 Anton Heggenstaller Gmbh Produktionseinrichtung

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2932406A1 (de) * 1979-08-09 1981-02-12 Anton Heggenstaller Verfahren und vorrichtungen zum strangpressen eines gemenges aus pflanzlichen kleinteilen und bindemitteln
EP0376175A2 (fr) * 1988-12-29 1990-07-04 Karl Schedlbauer 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
EP0908281A1 (fr) * 1997-10-10 1999-04-14 Werzalit Ag + Co. Procédé et dispositif pour fabriquer des articles moulés
DE10059443A1 (de) * 2000-11-30 2002-06-06 Karl Schedlbauer Verfahren und Vorrichtung zum Aushärten von Strängen aus Kleinteilen
DE10245284A1 (de) * 2002-09-27 2003-04-10 Karl Schedlbauer Verfahren und Vorrichtung zum Strang- und Strangrohrpressen von Kleinteilen, insbesondere Holzkleinteilen, z.B. für Palettenklötze
DE10153195A1 (de) * 2001-10-29 2003-05-08 Karl Schedlbauer Verfahren und Vorrichtung zum Aushärten von Strängen aus Kleinteilen mit Bindemitteln nach einer Strangpresse
DE10153193A1 (de) * 2001-10-29 2003-05-08 Karl Schedlbauer Verfahren und Vorrichtung zum Aushärten von Strängen aus Kleinteilen mit Bindemitteln nach einer Strangpresse
DE10245285A1 (de) * 2002-09-27 2003-05-08 Karl Schedlbauer Verfahren und Vorrichtung zur Verringerung des Pressdruckes und zur Steuerung der Verdichtung beim Strang- und Strangrohrpressen
DE10316119A1 (de) * 2003-04-09 2004-11-04 Karl Schedlbauer Verfahren und Vorrichtung zum Aushärten von Strängen aus Kleinteilen mit Bindemitteln nach einer Strangpresse
DE102005037765A1 (de) * 2005-08-10 2007-02-15 Karl Schedlbauer Verfahren und Vorrichtung zum Aushärten von Strängen nach einer Strangpresse

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2932406A1 (de) * 1979-08-09 1981-02-12 Anton Heggenstaller Verfahren und vorrichtungen zum strangpressen eines gemenges aus pflanzlichen kleinteilen und bindemitteln
EP0376175A2 (fr) * 1988-12-29 1990-07-04 Karl Schedlbauer 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
EP0908281A1 (fr) * 1997-10-10 1999-04-14 Werzalit Ag + Co. Procédé et dispositif pour fabriquer des articles moulés
DE10059443A1 (de) * 2000-11-30 2002-06-06 Karl Schedlbauer Verfahren und Vorrichtung zum Aushärten von Strängen aus Kleinteilen
DE10153195A1 (de) * 2001-10-29 2003-05-08 Karl Schedlbauer Verfahren und Vorrichtung zum Aushärten von Strängen aus Kleinteilen mit Bindemitteln nach einer Strangpresse
DE10153193A1 (de) * 2001-10-29 2003-05-08 Karl Schedlbauer Verfahren und Vorrichtung zum Aushärten von Strängen aus Kleinteilen mit Bindemitteln nach einer Strangpresse
DE10245284A1 (de) * 2002-09-27 2003-04-10 Karl Schedlbauer Verfahren und Vorrichtung zum Strang- und Strangrohrpressen von Kleinteilen, insbesondere Holzkleinteilen, z.B. für Palettenklötze
DE10245285A1 (de) * 2002-09-27 2003-05-08 Karl Schedlbauer Verfahren und Vorrichtung zur Verringerung des Pressdruckes und zur Steuerung der Verdichtung beim Strang- und Strangrohrpressen
DE10316119A1 (de) * 2003-04-09 2004-11-04 Karl Schedlbauer Verfahren und Vorrichtung zum Aushärten von Strängen aus Kleinteilen mit Bindemitteln nach einer Strangpresse
DE102005037765A1 (de) * 2005-08-10 2007-02-15 Karl Schedlbauer Verfahren und Vorrichtung zum Aushärten von Strängen nach einer Strangpresse

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2042283A1 (fr) * 2007-09-26 2009-04-01 Karl Schedlbauer Procédé et dispositif destinés à la pression de tronçons de petites pièces, en particulier de petites pièces en bois contenant des liants
DE202009012239U1 (de) 2009-09-11 2011-01-20 Anton Heggenstaller Gmbh Produktionseinrichtung
WO2011029922A2 (fr) 2009-09-11 2011-03-17 Anton Heggenstaller Gmbh Dispositif de production et procédé de production
WO2011029922A3 (fr) * 2009-09-11 2011-12-01 Anton Heggenstaller Gmbh Dispositif de production et procédé de production

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