EP0339497A2 - Procédé et dispositif pour extruder des tiges ou pour extruder des tubes - Google Patents

Procédé et dispositif pour extruder des tiges ou pour extruder des tubes Download PDF

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Publication number
EP0339497A2
EP0339497A2 EP89107169A EP89107169A EP0339497A2 EP 0339497 A2 EP0339497 A2 EP 0339497A2 EP 89107169 A EP89107169 A EP 89107169A EP 89107169 A EP89107169 A EP 89107169A EP 0339497 A2 EP0339497 A2 EP 0339497A2
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EP
European Patent Office
Prior art keywords
mandrel
strand
pressing
compression
press
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.)
Granted
Application number
EP89107169A
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German (de)
English (en)
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EP0339497B1 (fr
EP0339497A3 (fr
Inventor
Karl Schedlbauer
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SCHEDLBAUER, KARL
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Individual
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Filing date
Publication date
Priority claimed from DE19883814068 external-priority patent/DE3814068A1/de
Priority claimed from DE19883814085 external-priority patent/DE3814085A1/de
Priority claimed from DE19883816630 external-priority patent/DE3816630A1/de
Application filed by Individual filed Critical Individual
Publication of EP0339497A2 publication Critical patent/EP0339497A2/fr
Publication of EP0339497A3 publication Critical patent/EP0339497A3/fr
Application granted granted Critical
Publication of EP0339497B1 publication Critical patent/EP0339497B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • B30B11/26—Extrusion presses; Dies therefor using press rams
    • 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 relates to a method and an apparatus for extruding or extruding a mixture of small plant parts with binders, the mixture being pressed into a curing channel by a press ram with compression from a filling and pressing chamber.
  • extrusion presses are extrusion presses that produce hollow strands using one or more mandrels.
  • Standing mandrels are mandrels that are fixed in the pressing direction and over which the material is pressed in sliding friction.
  • these mandrels are provided with electrical resistance heaters as soon as their cross-section permits.
  • the compression is controlled in these extrusion tube presses as in extrusion presses by reducing the pressing force of clamping elements on the outer surface of the extrusion in the curing channel.
  • a large number of clamping elements are used in the extrusion hydraulic cylinders, which are supplied with pressure oil by a pump.
  • the friction between the mandrel and the strand reduces the proportion of the friction between the strand and the walls of the curing channel that is generated by the tensioning elements for controlling the weights.
  • the possibility of controlling the compression becomes less the longer the mandrel is formed. With longer mandrels, the compaction can only be controlled to a very small extent or not at all. This means that the heating power of heated standing mandrels is very low and the curing time can only be shortened slightly.
  • DE-PS 8 56 045 extrusion presses are known in which the parts of the outer layer of the compacted mixture are bent with their surfaces predominantly parallel to the outer skin in that the cross section of the press manner is gradually reduced in length.
  • DE-PS 17 03 414 shows the compacted strand to be further compacted in the outer layer by step-like reduction of the compression channel, and thus also to fold the parts of the batch parallel to the outer surfaces of the strand.
  • strands made according to these teachings have a low bond strength and cannot be used as components subject to bending stress, such as beam supports, etc. This process also results in a very high weight of the strand, which can hardly be controlled or influenced.
  • the invention has for its object to produce strands of small parts, in particular small wooden parts, with binders at high speed, an optimal connection of the parts of the mixture with each other and a precisely selectable, adjustable and repeatable compression of the weights and specific weight by a method and a device.
  • extruded tube products are to be produced which are resilient to bending in such a way that they can be used as load-bearing components.
  • strands are to be produced from small parts, in particular from small wooden parts with binders, which are pressed to the greatest possible material-specific compression and strength.
  • the invention uses a moving mandrel which is of such a length that the static friction between it and the strand is greater than the compressive force required to compress the batch minus the frictional forces acting on the outer surfaces of the strand.
  • mandrels are referred to which are guided through the extrusion die, run along with the extrusion when pressed and are withdrawn into their starting position after the pressing stroke has ended.
  • the moving mandrel is fastened to a hydraulic cylinder, which prevents the mandrel from running along with the strand by means of a pressure limiting valve, which acts as a brake, up to an adjustable and very rapidly changing pressure.
  • This pressure is selected and set so that the extrusion die can build up the compression pressure.
  • the new strand section produced by the press stroke is completed and is pressed out along the entire strand by its own length.
  • the thorn runs along this path with the strand.
  • the time and the distance that the extrusion die needs to be braked by the pressing speed to its forward end position in the rest position is minimized by increasing the force holding the mandrel. This has the advantage of shortening the pressing time and increasing the output of the press. At the same time, pressure peaks in the cylinder driving the extrusion die are prevented when switching from the pressing movement to the rest position.
  • the extrusion die When the extrusion die has reached the front end position and the strand has been pressed out by the length of the newly formed strand part, it remains in this position and is secured against being pushed back by the strand, preferably by means of a hydraulic check valve.
  • the mandrel which has run along with the length of the newly formed strand, is now pulled back into its starting position by overcoming the static friction. The extrusion die then moves back to its starting position.
  • the invention has a further advantage. If the mandrel, which is possible from a certain cross-section, is heated, for example by heat transfer oil, it can transfer a significant part of the thermal energy required to set the binder.
  • the moisture in the batch and the liquid in the binder are used as the heat transfer medium in the strand, which evaporate from the heat source during curing. Since the dry mixture forms a strong barrier against the passage of heat, the curing becomes disproportionately more and more lengthy with increasing cross-section of the strand.
  • the heat supply via the mandrel thus represents heating from two sides, and can reduce the curing time of the binder by 30% and even up to 60% if the strand has the appropriate profile.
  • the curing channel which is very complex, can be manufactured correspondingly shorter. In addition to the lower construction costs, this also results in a significant reduction in the space requirement of the extrusion tube press system.
  • the object is further achieved according to the invention in that the parts of the batch are transported by a closing slide from below a filling shaft via the filling opening of a filling space and from there fall into the filling space in free fall. After the slide has closed the filling opening of the filling chamber, the batch located in the filling chamber is z. B. 30% compressed.
  • a parallel curing channel adjoins the filling chamber with an inclined surface running in the pressing direction, which runs from a larger into a smaller radius to the inner surface of the curing channel, which cross-section is therefore smaller than the front of the filling chamber.
  • the partially compressed mixture is pressed by the extrusion die in such a way that the degree of partial compression is maintained until the extrusion die reaches the end of the filling space.
  • the extrusion die stands at an adjustable but preferably constant speed from its rear to its front end position.
  • the end of the strand that has already been pressed is located below the front surface of the Sliding gate at the same height as the end of the filling chamber.
  • the mandrel is held in its rear setting by an adjustable force acting against the pressing direction.
  • the holding force of the mandrel acting against the pressing direction until the end face of the extrusion die reaches the end of the filling chamber is regulated in such a way that the compression and the size are not increased, although the extruded strand is pressed out is. So there remains the distance between the end face of the extrusion die and the end of the pressed strand over the distance that the extrusion die from the point at which the desired degree of compression has been reached to the point at which the end faces of the extrusion die the leading edge of the closing slide, the same size.
  • the force required for the desired partial compression is greater than the friction between the strand and the curing channel, then the force must be directed against the pressing direction. If it is smaller, it must be directed in the pressing direction and the pushing out of the strand is supported by the mandrel.
  • the mandrel holding force Since the static friction is greater than the sliding friction, the mandrel holding force must be changed accordingly along the way. Likewise, the kinetic energy for accelerating the strand at rest to the speed of the extrusion die is changed by changing the size of the mandrel holding force Transfer extrusion stamp as the desired degree of partial compression does not change.
  • the total pressing force is its sorting force, which is composed of the pressing force of the extrusion die, the frictional force of the strand which has already been pressed, the part of the strand which is in the compression and the mandrel holding force.
  • the total pressing force is shown in an ideally possible short way, so that the final compression of the extrusion to be pressed is established. This is done by changing the sizes and possibly the direction of the mandrel holding force.
  • the speed of the mandrel running or pressing along with the strand is reduced so that the static friction between the mandrel and the pressed strand is just retained. This reduces the distance between the end face of the extrusion die and the end of the strand that has already been pressed to such an extent that the final compression of the strand part to be pressed is obtained.
  • the desired partial compression and the precisely adjustable final compression can be controlled both by the pressure forces of the extrusion die and the mandrel and by the time / distance of the press die and mandrel.
  • extrusion tube presses have a number of advantages: -
  • the profile can be made in any length and is not tied to the length dimension of the press.
  • the extrusion tube press works with a relatively low compressive force of about 35 to 80 kp / cm2 on the end face of the strand, whereas molding presses generate the soft specific force over the entire circumference and must be maintained during the entire curing time.
  • the manufacturing costs of an extrusion tube press are less than the costs of a molding press.
  • the product costs per cm3 pressed batch are much lower than for molding presses.
  • the invention is further based on the knowledge that the strength of pressed small parts, in particular small wooden parts with binders, in contrast to naturally grown wood, is greatest when they are compressed to such an extent that they deform plastically and permanently and close to one another pressed mixture, but their fiber structure is preserved and they do not flow.
  • the mandrel is to be moved such that its end is at the beginning of the degree of hardening. Then it is brought to the desired final compression by enlarging the mandrel that does not move in the longitudinal direction in this work step. The cross-sectional enlargement takes place in the length of the strand section to be formed with the press stroke.
  • the mandrel part adjoining it in the strand has the same cross-section and is somewhat smaller than the mandrel part which is enlarged in cross-section. After the final compression, the mandrel cross-section of the expandable mandrel part is reduced to such an extent that the mandrel can be pulled out of the strand and brought into its end position without further compression of the strand part produced with the press stroke.
  • the strand can be secured against being pulled back against the pressing direction by the press ram. However, this can be done by a corresponding increase in the friction between the strand and the hardening channel, so that the press ram can reach its starting position with its mandrel.
  • the mandrel Due to the compression characteristic of the small parts to be compressed, the mandrel only has to be slightly enlarged will. According to this enlargement, the final compaction results in the weights and the specific weight, which can be selected from the lowest necessary compaction, which is necessary for introducing the pre-compressed mixture into the curing channel or for moving the small parts parallel to the pressing direction, up to the yield point of the material, adjustable and reproducible with every stroke.
  • the thickness of the oriented outer layer determines the reduction of the filling and pressing space onto the hardening channel, it is of course possible to carry out the compression in two stages without moving the parts of the outer layer.
  • the batch is pre-compressed by the press ram, finally compressed and pressed out by widening the cross-section.
  • the invention also teaches to pre-compress the batch by the press ram, to bring it into the hardening channel by moving the press ram and mandrel, and to finally compress it by widening the cross-section of the mandrel. This can be particularly advantageous if the product to be produced is subjected to more pressure than bending strength.
  • the degree of enlargement of the mandrel does not of course have to be the same size in relation to its profile. Much more teaches the invention to adjust the cross-sectional enlargement of the wall thickness and the type of loading of the strand and thus to produce the same cross-section or, if this is advantageous, a different compression at each point. Furthermore, the invention is not limited to one mandrel, but also provides two or more mandrels, which may have the same or different cross sections, according to the profile of the strand.
  • the mandrels can be enlarged in different ways and the enlargement can take place not only simultaneously, but also at different times.
  • the workpiece is produced more cost-effectively and consists of a naturally renewable material, the processing of which is largely free of environmental problems.
  • the mandrel can be enlarged by one or more tension or compression parts.
  • the part of the mandrel that lies in the cavity of the strand part produced with the press stroke and is not moved in the longitudinal direction in the final compression with the entire mandrel is pressed against the walls of the cavity by longitudinal movement of the tension or compression parts and compresses the strand section the final measure. If necessary, the parts are moved such that the friction is reduced and the mandrel on the strand is pulled out and moved in its initial position without re-compressing the strand part.
  • the invention provides that the spikes are common to be removed individually or in groups with or without movement of the tension or compression parts in the mandrels in order to avoid recompaction.
  • the mandrels are not enlarged in cross section at the same time or individually or in groups at different times. This is necessary with these extruded profiles so that the center of gravity of the mandrel maintains its position in the extruded cross section. It has proven to be particularly advantageous and economical since, since there are no mechanical friction losses and the final compression can take place very quickly, the cross section of the region which can be expanded in cross-section can be made elastic. The cross-sectional expansion is carried out, for example, by pressurizing with a liquid medium. In the groupless state, the cross section corresponds to the mandrel part adjoining on the press ram side.
  • the cross section is expanded by the pressure of the medium in such a way that the strand section reaches its final compression. If necessary, the pressure of the medium is reduced to such an extent that the mandrel can be pulled out of the strand without re-compressing the strand part produced with the press stroke.
  • the invention further provides for the elastic mandrel part to be provided with, for example, a metallic protective layer which protects it against penetration into parts of the batch and, if necessary, reduces the friction against the strand.
  • the mandrel parts which cannot be expanded in cross section are connected to one another by a tensile or compressive element.
  • the jacket which can be expanded by pressure, can be secured in the pressing direction by supporting elements.
  • the mandrels can be heated. This can be done with a liquid Medium or by an electrical resistance heater.
  • Another idea of the invention is to design the mandrels with curved surfaces on the outside. This results in the advantages with regard to compression, the controllability of the extrusion tube press, the swelling behavior of the portion of the strand that has not yet or inadequately set and the mobility of the strand in the curing channel. The less the strand has set through its binder, the more it swells. This swelling is prevented by turning the hardening channel outwards. However, if the swelling force becomes too great, the strand sticks in the curing channel and can no longer be pressed out. The mandrel could also jam if the expandable cross-section were not reduced by a necessary amount after the final compression.
  • the compacted mixture When the cross section of the mandrel is reduced, the compacted mixture tries to swell inwards, that is, into the cavity formed by the mandrel and to reduce the cross section of the cavity.
  • the boundary layer to the cavity behaves more or less like a vault. They are further compressed by the swelling and form an increasing resistance to a reduction in cross-section until the swelling and compression forces are in equilibrium. The degree of reduction is very small due to the compression characteristic of the material. In practice, a deterioration of the surface is not or hardly detectable.
  • FIG. 1 shows an offset longitudinal section through an extrusion device 1.
  • a filling device 2 for extrusion presses From the inlet shaft of a filling device 2 for extrusion presses, the batch is transported through the closing slide 3 over the filling and pressing space 4, into which it falls in free fall. Then the filling and pressing chamber 4 is closed by the closing slide 3 and the batch by the ram 5 with the mandrel 6 at a desired pre-compression, e.g. 30%, compacted. Due to the joint movement of mandrel 6 and press ram 5, the pre-compressed strand section is guided into the hardening duct 7 and the strand located in the hardening duct 7 is pressed out correspondingly far.
  • a desired pre-compression e.g. 30%
  • the mandrel 6 is moved such that the distance between the rear end of the strand 10, which is at the height of the rear end 12 of the curing channel 7, and the end face 11 of the ram 5 remains the same.
  • the cross-section decreases over the circumferential inclined surfaces 13 with the radius 14 to the cross-sectional dimension of the curing channel 7.
  • this reduction is passed through the pre-compressed mixture, the parts on the outer layer are folded parallel to the outer surfaces .
  • the parts of the batch are not kinked or kinked due to the degree of pre-compression, but retain their strength.
  • the thickness of the outer layer is determined by the degree of reduction. Strands with ver different strength can be generated. In the case of components subject to bending stress, e.g. B. load-bearing beam profiles, one will choose a higher flexural strength with low overall compression and weights, with pressure-stressed components, e.g. B. pallet blocks, correspondingly a higher total compression with higher compressive strength.
  • the press ram 5 passes over the rear end 9 of the curing channel 7 - moving into its predetermined front end position - the mandrel 6 is moved in such a way that the desired final degree of compression is obtained.
  • the strand section produced with the press stroke is thus completed. Due to the static friction between mandrel 6 and strand 8, the strand and the press ram 5 are withdrawn by the mandrel 6 to such an extent that the end face 11 of the press ram 5 and the end 10 of the strand 8 are located at the rear end 12 of the curing channel 7.
  • the press die 5 stops and, by overcoming the static friction, the mandrel 6 is pulled out of the strand 8 and moved into its starting position. Thereafter, the press ram 5 moves into its starting position and ends the press operation.
  • the invention is not limited to the use of the mandrel. Rather, any number of mandrels can be used, which can protrude through the filling and pressing space 4 into the hardening channel 7 at any point.
  • the invention provides for the mandrels not to be pulled out of the strand at the same time, but rather individually or only a certain number of mandrels.
  • the invention further teaches that the mandrels for increasing or reducing the friction are made conical or wedge-shaped in length or parts of the length, increasing or decreasing. If the cross section of the thorn (s) is changed, this can also be done along non-straight lines.
  • a pallet block profile with two cavities is generated.
  • two press cylinders 19, 19 'with their piston rods 20, 20' are attached.
  • the extrusion die 21 is connected via the cylinder cross member 22 to the press cylinders 19, 19 '.
  • the extrusion die 21 runs over the mandrels 24, 24 ', which are guided via a mandrel cross member 25 with the mandrel holding cylinder 26 in the pressing direction.
  • the level of compression is determined by the pressure in the mandrel holding cylinder 26 determined, which is precisely selectable, adjustable and reproducible with every cycle by a pressure relief valve attached to the cylinder or connected with lines.
  • the mandrels 24, 24 ' which have run along with the length of the newly formed strand part, are pulled back into their starting position by the mandrel holding cylinder 26. Then the extrusion die 21 moves back to its starting position.
  • the profile of the strand 23 is shown, which is formed by the boundary walls 27 and the closing slide 28 and the mandrels 24, 24 '.
  • the closing slide 28 is moved back and forth by a stroke transmitter 29 and, with its passage opening 30, enables the batch to fall from the filling shaft 31 into the filling and pressing space 16 in free fall.
  • a longitudinal section through an extruded tube pressing device the mixture 32 in the filling and pressing chamber 33 is pre-compressed by the press ram 34, the filling and pressing chamber 33 being closed by the closing slide 345.
  • the mandrel part 36 which can be expanded in cross section, is not expanded and has the cross section of the mandrel part 37 adjoining the press ram.
  • the strand 39 is located in the hardening channel 38 and therein the non-expandable mandrel part 40 on the hardening channel side.
  • the mandrel 41 is in its initial position.
  • the amount of precompression can be determined via the path or the pressing force of the press ram 34.
  • the next compression process is shown in FIG.
  • the mixture was compacted by moving the small parts of its outer skin over the reduction 42 between the filling and pressing space 33 and the curing channel 38 to or almost to its final length and moved such that at the end of this step the end 43 of the strand part 44 is at the beginning 45 of the curing channel 38.
  • the expanded mandrel part 36 is in the non-expanded state and is located in the strand part 44.
  • the strand part 44 produced with the press stroke has been completed and has extended the strand by its length.
  • the final compression is carried out by widening the cross section of the mandrel part 36.
  • the cross section widened according to the invention to a larger cross section than that of the mandrel part located in the strand 39 40. This cross-sectional expansion was reduced to at least the cross section of the mandrel part 40 after the final compression before the mandrel 41 was pulled out.
  • FIG. 1 An exemplary longitudinal section through a mandrel 41 is shown in FIG.
  • the cross-sectionally expandable mandrel part 36 is expanded to the cross-section of the hardening channel-side mandrel part 40 or somewhat larger and between it and the press-die side mandrel part 37 held such that it is not or not significantly longitudinally movable. The expansion took place via the pull wedge 46.
  • the cross section of the mandrel part 37 corresponds to that of the mandrel part 36.
  • the expandable mandrel part 36 can be made of a plastic material or, if it is not plastic, can be made with expansion slots.
  • FIG. 9 A cross section on the line I-I according to FIG. 9 is shown in FIG.
  • a round mandrel was selected for the example, which is heated by an electrical resistance heater 47. The current is supplied through the bore 48.
  • the elastic, but not or almost non-compressible mandrel part 36 is provided with a, for example, metallic protective layer 49 which prevents the penetration of parts of the mixture and reduces the friction.
  • FIG. 11 shows a longitudinal section through a mandrel 41, in which the mandrel part 36 is widened under pressure by means of a liquid medium in the cavity 57.
  • the applied protective layer 49 which reduces the friction and prevents the penetration of parts of the batch, is designed to be longitudinally stable and avoids that the hose-like element 50 is placed excessively over the rounded corners 52, 52 'when pressurized.
  • the protective layer 49 is also longitudinally stable in such a way that it can overcome the frictional forces of the strand 39 when the mandrel 41 is pulled out.
  • the invention is not limited to the named ways of expanding the mandrel part 36 but teaches that the advantages of the invention can be achieved with other types of cross-sectional expansion.
  • Figure 12 shows the cross section of a profile that can be used for example as a wall element in house construction.
  • the lightweight construction with a large spacing of the outer surface 53 with oriented chips is advantageous here.
  • the cross-sectional expansion was carried out here from line 54 to strand wall 55.
  • Figure 13 shows a support profile, for example for prefabricated houses.
  • the final compression is also carried out here by expanding the mandrels from the lines 54 to the strand inner walls 55.
  • only the two outer surfaces 53 are oriented.
  • FIG. 14 shows, for example, a window or door profile in which all outer surfaces are oriented.
  • the final compaction was carried out by expanding the mandrel from lines 54 to strand walls 55.
  • the inner strands of the strand are designed with inner surfaces intended in the strand in order to support the swelling pressure.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Formation And Processing Of Food Products (AREA)
EP89107169A 1988-04-26 1989-04-20 Procédé et dispositif pour extruder des tiges ou pour extruder des tubes Expired - Lifetime EP0339497B1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
DE19883814068 DE3814068A1 (de) 1988-04-26 1988-04-26 Verfahren und vorrichtung zum strangrohrpressen eines gemenges aus pflanzlichen kleinteilen mit bindemitteln
DE3814068 1988-04-26
DE3814085 1988-04-26
DE19883814085 DE3814085A1 (de) 1988-04-26 1988-04-26 Verfahren und vorrichtung zur steuerung der verdichtung beim strang- und strangrohrpressen von kleinteilen, insbesondere holzkleinteilen, mit bindemitteln
DE19883816630 DE3816630A1 (de) 1988-04-26 1988-05-16 Verfahren und vorrichtung zum strangrohrpressen von kleinteilen, insbesondere holzkleinteilen mit bindmitteln
DE3816630 1988-05-16

Publications (3)

Publication Number Publication Date
EP0339497A2 true EP0339497A2 (fr) 1989-11-02
EP0339497A3 EP0339497A3 (fr) 1991-04-10
EP0339497B1 EP0339497B1 (fr) 1994-11-09

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EP89107169A Expired - Lifetime EP0339497B1 (fr) 1988-04-26 1989-04-20 Procédé et dispositif pour extruder des tiges ou pour extruder des tubes

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EP (1) EP0339497B1 (fr)
AT (1) ATE113893T1 (fr)
DE (1) DE58908617D1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1006847A4 (fr) * 1991-05-29 1995-01-03 Karl Schedlbauer Dispositif de chargement dose d'un melange de petits fragments, notamment vegetaux, dans la chambre de remplissage et de compression d'une extrudeuse ou presse a boudiner.
EP0718079A1 (fr) * 1994-12-14 1996-06-26 Karl Schedlbauer Procédé et dispositif pour la fabrication de panneaux et bandes tubulaires
WO1999048676A1 (fr) * 1998-03-25 1999-09-30 Karl Schedlbauer Procede et dispositif permettant d'extruder en continu, de façon classique ou par presse tubulaire, des matieres particulaires
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
DE202020100117U1 (de) * 2020-01-10 2021-04-13 Pfeifer Holz Gmbh Strangpresseinrichtung und Strangpressprodukt

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1058658B (de) * 1956-03-19 1959-06-04 E H Leo Pungs Dr Ing Dr Ing Verfahren und Einrichtung zur kontinuierlichen Herstellung von Holzspan-Formpresskoerpern, insbesondere Holzspanplatten
DE977639C (de) * 1950-06-04 1967-11-23 Otto Kreibaum Presse zur Herstellung von Spanplatten
BE719721A (fr) * 1967-08-21 1969-02-03
US3530552A (en) * 1968-04-29 1970-09-29 Glen H Calder Extrusion device
US3578523A (en) * 1966-05-21 1971-05-11 Alfred Graf Zu Erbach Furstena Extrusion molding of particle board having particular surface characteristic

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE977639C (de) * 1950-06-04 1967-11-23 Otto Kreibaum Presse zur Herstellung von Spanplatten
DE1058658B (de) * 1956-03-19 1959-06-04 E H Leo Pungs Dr Ing Dr Ing Verfahren und Einrichtung zur kontinuierlichen Herstellung von Holzspan-Formpresskoerpern, insbesondere Holzspanplatten
US3578523A (en) * 1966-05-21 1971-05-11 Alfred Graf Zu Erbach Furstena Extrusion molding of particle board having particular surface characteristic
BE719721A (fr) * 1967-08-21 1969-02-03
US3530552A (en) * 1968-04-29 1970-09-29 Glen H Calder Extrusion device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1006847A4 (fr) * 1991-05-29 1995-01-03 Karl Schedlbauer Dispositif de chargement dose d'un melange de petits fragments, notamment vegetaux, dans la chambre de remplissage et de compression d'une extrudeuse ou presse a boudiner.
EP0718079A1 (fr) * 1994-12-14 1996-06-26 Karl Schedlbauer Procédé et dispositif pour la fabrication de panneaux et bandes tubulaires
WO1999048676A1 (fr) * 1998-03-25 1999-09-30 Karl Schedlbauer Procede et dispositif permettant d'extruder en continu, de façon classique ou par presse tubulaire, des matieres particulaires
WO1999048675A1 (fr) * 1998-03-25 1999-09-30 Karl Schedlbauer Procede et dispositif pour la fabrication d'un profile extrude
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
DE202020100117U1 (de) * 2020-01-10 2021-04-13 Pfeifer Holz Gmbh Strangpresseinrichtung und Strangpressprodukt

Also Published As

Publication number Publication date
DE58908617D1 (de) 1994-12-15
ATE113893T1 (de) 1994-11-15
EP0339497B1 (fr) 1994-11-09
EP0339497A3 (fr) 1991-04-10

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