WO2002094521A1 - Presse a double bande - Google Patents

Presse a double bande Download PDF

Info

Publication number
WO2002094521A1
WO2002094521A1 PCT/EP2002/004949 EP0204949W WO02094521A1 WO 2002094521 A1 WO2002094521 A1 WO 2002094521A1 EP 0204949 W EP0204949 W EP 0204949W WO 02094521 A1 WO02094521 A1 WO 02094521A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure
pressed
press
double belt
section
Prior art date
Application number
PCT/EP2002/004949
Other languages
German (de)
English (en)
Inventor
Bernd Heimes
Peter Beck
Original Assignee
Metso Paper, Inc.
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 Metso Paper, Inc. filed Critical Metso Paper, Inc.
Publication of WO2002094521A1 publication Critical patent/WO2002094521A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B5/00—Presses characterised by the use of pressing means other than those mentioned in the preceding groups
    • B30B5/04—Presses characterised by the use of pressing means other than those mentioned in the preceding groups wherein the pressing means is in the form of an endless band
    • B30B5/06—Presses characterised by the use of pressing means other than those mentioned in the preceding groups wherein the pressing means is in the form of an endless band co-operating with another endless band
    • 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
    • B27N3/24—Moulding or pressing characterised by using continuously acting presses having endless belts or chains moved within the compression zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/34—Heating or cooling presses or parts thereof

Definitions

  • the invention relates to a method of the preamble of claim 1 and a double belt press of the type corresponding to the preamble of claim 4.
  • Such a method and such a double belt press are known for example from DE 39 04 982 C1.
  • support plates are provided, on which the forming belts are supported by roller chains that move along.
  • the support plates are supported by strong supports arranged transversely to the web above or below the respective support plate, which are pulled together by spindles outside the web width.
  • holes running transversely to the web are provided, which form channels for the passage of a heat transfer medium, usually thermal oil. Too many channels follow one another in the direction of travel of the railway. Successive channels are connected to one another by U-shaped pipe elbows attached to the edges of the support plates, so that the heat transfer medium runs in a zigzag across the web and in this way the uniformity of the heat transfer is improved.
  • Several transverse bores in succession in the running direction of the path form a group that is fed together with the heat transfer medium.
  • considerable heat must be introduced into the starting material to be pressed in the first zone of the pressing section in order to carry out the hardening reaction of the binder.
  • the moisture contained in the starting material serves to transport the heat into the starting material and to plasticize it.
  • the heat supply no longer has to be as great, but it is primarily a question of maintaining the pressure, so that the bonds introduced within the smooth material are not relieved by premature relief before they have fully hardened be torn open again and destroy the material to be pressed.
  • the invention is therefore based on the object of providing a method and a device suitable for carrying out the method, in which the
  • Vapor pressure curve is easily adjustable during the manufacturing process.
  • the (pressure-effective) width of the gap between differently tempered zones of the press section has a major influence on the temperature and vapor pressure behavior of the material to be formed during the production process and thus on the properties of the end product.
  • the method according to the invention is accordingly characterized in that the pressure exerted on the starting material or on the material to be formed is reduced over a region of the advance in the pressing section, the length of which can be adjusted.
  • the starting material is subjected to at least two press sections different in the forward direction during the advance through the press section and, if appropriate, pressure treatments, it is preferred to provide for the pressure reduction between the successive press sections.
  • the press sections are formed by support plates provided on at least one side of the press section, the pressure between the press sections is preferably reduced by varying the width of the gap existing between the successive support plates.
  • the object on which the invention is based is achieved by a double belt press for the continuous production of material to be pressed from the starting material to be pressed, in particular chipboard from particles held together by a pressure and optionally heat-hardened binder, with a pressing section in the case of which
  • Passing the starting material into the material to be pressed, optionally with the application of heat, is achieved in that means are provided on at least one side of the pressing section, by means of which the pressure exerted on the starting material to be pressed is adjustable over a forward area within the pressing section, the length of which is adjustable is, is reducible and thereby creates a possibility of evaporation and thus a reduction in the internal vapor pressure in the starting material.
  • the means for reducing the pressure are formed in that the pressing section at least on one side in the
  • the means for reducing the pressure can be designed in such a way that the pressure-effective gap width can be varied.
  • This can be structurally effected, for example, in that the support plates which follow one another in the forward direction are arranged such that they can be displaced relative to one another in the forward direction.
  • the pressure-effective gap width variation can take place during production changes to another material to be pressed.
  • the gap width can be varied while the process is running to control the vapor pressure in the material to be pressed, if means for detecting the vapor pressure or parameters correlated with the vapor pressure and a suitable control loop are provided.
  • the moisture in the mat, ie in the material to be pressed, is particularly suitable as a parameter.
  • the pressure-effective gap width can also be varied if means for varying the pressure-effective gap width can optionally be introduced into the gap between the successive support plates.
  • these means can comprise, for example, a bar that can be displaced transversely to the direction of advance, the length of which is approximately the width of the support plates and the width is smaller than the gap width. If the beam is completely moved into the gap, so that its side facing the material to be pressed is approximately in one of the corresponding side of the
  • the pressure-effective gap width is varied in that the mutually facing ends of the successive support plates in the forward direction can be displaced transversely to the forward direction with warping of the heating plates.
  • the heating plates are therefore designed flexibly in the region of their facing ends and can be bent by suitable means - for example by spindle drives or hydraulically or pneumatically operated piston / cylinder units.
  • the means can in turn be activated manually or by motor, and in the latter case the vapor pressure in the material to be pressed can be regulated again by switching on a suitable controlled system during the current process.
  • a double belt press according to the invention and various preferred embodiments of the structural design for varying the pressure-effective gap width are shown.
  • FIG. 1 shows a longitudinal section through a double belt press according to the invention.
  • FIG. 6 shows the separation point area A of a further embodiment in a detailed illustration according to section line A-A in FIG. 7;
  • Fig. 7 the same separation point area as in Fig. 6 in a plan.
  • the double belt press designated as a whole by 100, is used in particular for the production of chipboard, fibreboard and other plate-shaped materials which consist of particles bound by means of a binder which cures under pressure and heat. It comprises an upper forming belt 1 made of sheet steel of approximately 2 to 3 mm in thickness and an equally lower forming belt 2. Between the forming belts 1, 2, a web 4 is pressed together from a bed 4 'of a starting material in a pressing section 3, which here is made of the binder-provided particle material, which results in one of the aforementioned materials after pressing.
  • the upper forming belt 1 runs around drums 5, 6 arranged transversely to the web and can, for example, be hydraulically tensioned between these drums 5, 6.
  • the forming belt 2 runs over drums 11, 12 arranged transversely to the web 4, which also tension the form achieve band 2.
  • the shaping belts 1, 2 are driven via the drums.
  • the forming strips 1, 2 run through the device in the sense indicated by the arrows 16.
  • the lower run 1 'of the upper shaping belt 1 and the upper run 2' of the lower shaping belt 2 move closely one above the other.
  • the bed of the starting material 4 'applied to a conveyor belt (not shown) on the left-hand side of the drawing is drawn into the pressing section 3 and compressed between the runs 1', 2 '. From the conveyor belt, the bed of the starting material 4 'is transferred to a rolling tray 7 which transfers the bed to the lower forming belt 2 shortly before the upper vertex of the drum 11.
  • the outgoing web 4 of the plate material is divided on the right side according to the drawing by suitable devices, not shown, and conveyed away.
  • an upper support structure 17 is provided in the inner region of the forming belt 1 above the lower run 1 ', which cooperates with a lower support structure 18 provided in the inner region of the lower forming belt 2 below its upper run 2'.
  • the support structures 17, 18 support the web 4 and press it against one another with great force.
  • the support structures 17, 18 each consist of individual beams 19, 20, each lying in pairs above and below the
  • Form tapes 1, 2 and the web 4 are arranged.
  • Each pair of supports 19, 20 is clamped together by lateral spindles, not shown, located laterally outside of the pressing section 3, so that individual pressure members which are self-contained are formed.
  • Strong support plates 26, 27 are located between the supports 19, 20 and the shaping belts 1, 2, which transmit the force exerted by the individual supports 19, 20 evenly to the shaping belts 1, 2 and thus the web 4.
  • the support plates 26, 27 have channels which run transversely to the web 4 and run across their width through which a heat transfer medium can be conducted.
  • the channels follow each other closely in the direction of travel 16 and are connected to one another at the ends by pipe bends, so that groups of channels with a common heat transfer medium are flowed through in a meandering manner.
  • Roller chains 30 are arranged between the mutually facing sides of the support plates 26, 27 and the forming belts 1, 2, on which the forming belts 1, 2 roll on the supporting plates 26, 27 and which are endless in a vertical longitudinal plane around the supporting plates 26, 27 within the Run around forming tapes 1, 2.
  • the rollers of the roller chains 30 transmit both the pressure and the heat of the support plates 26, 27 to the forming belts 1, 2 and thus the web 4 that is being formed.
  • the forming belts 1. 2 thus experience rolling support in the pressing section 3.
  • the press section 3 is subdivided into two sections 3 ', 3 "which follow one another in the running direction 16 of the web.
  • the heat is supplied by the heating of the heat transfer medium, which causes a certain vapor formation in the compressed bed of the starting material 4 'and the The binder contained therein hardens, and the heat transfer medium, for example a thermal oil, is placed in a heat exchanger
  • the heat exchanger 40 heated and circulated so that the just heated heat transfer medium in the direction of arrow 41 is supplied at the beginning of the first section 3 'and in the direction of arrow 42 at the end of the first section again removed from the channels of the support plates 26, 27 and in a closed its circuit is returned to the heat exchanger 40.
  • the heat exchanger can, as shown, in turn be acted upon by a further heat transfer medium heated in a heating unit 43 with heating registers 44, or else contain the heating itself.
  • the heat transfer medium flows through a heat exchanger 50, in which, however, no heat is supplied to it, but on the contrary, part of the heat supplied in the first section 3 ', which is caused by the movement of the forming belts 1, 2 of the roller chains 3 and the web 4 in the rear section 3 "has been withdrawn again.
  • the heat extracted relaxes the
  • the heat extracted in the heat exchanger 50 is used in an aggregate 53, which is only symbolically indicated in the drawing, be it for heating purposes or be it for drying at a point upstream of the process sequence on the left side of the drawing for heating the particles the particles are used to heat water and / or thermal oil or for similar purposes.
  • an aggregate 53 which is only symbolically indicated in the drawing, be it for heating purposes or be it for drying at a point upstream of the process sequence on the left side of the drawing for heating the particles the particles are used to heat water and / or thermal oil or for similar purposes.
  • the channels formed transversely to the track 4 in the support plates can be connected differently to groups that follow one another in the running direction 16.
  • a further heat transfer medium, which is not heated, can also be passed through the second section 3 'if the support plates 26, 27 and the roller chains 30 are designed to be continuous over the entire length of the pressing section 3 (see FIG. 5).
  • Sections 3, 3 not only in terms of their loading with heat transfer medium, but also mechanically separated from one another.
  • first section 3 ' separate support plates 26', 27 'lie above and above one another below the web 4 opposite, which extend from the inlet to a separation point 28 at the end of the first section 3 'and are surrounded by associated endless roller chains 30'.
  • separation point 28 separate support plates 26 ′′, 27 ′′, which extend to the end of the pressing section 3 or the rear section 3 ′′ and are surrounded by their own roller chains 30 ′′ and a gap 60 from which the forming strips 1, 2 start, start transition into the first section 3 'into the rear section 3 ", the pressure-effective gap width of which can be varied, as will be described below with reference to FIGS. 2 to 4, which show the area A around the separation point 28 in an enlarged view.
  • the heat that nevertheless reaches the rear section through the shaping belts 1, 2 and the web 4 is partly extracted into the heat exchanger 50 from the heat transfer medium flowing through the support plates 26 ", 27" and used.
  • FIG. 2 which schematically shows a first constructive embodiment of a double belt press according to the invention for varying the pressure-effective gap width WB of the gap 60
  • the support plate 27 " is arranged such that it can be displaced relative to the support plate 27 'in the forward direction 16 of the web 4, as is shown in FIG this is to be illustrated by the double arrow 61 and the position shown in broken lines, which shows a reduced pressure-effective gap width WB of the gap 60.
  • the displacement of the support plate 27 " is used in the drawing, not shown, hydraulically operated devices such as piston / cylinder units.
  • a bar 62 is provided, which optionally consists of one in FIG solid position outside the gap 60 can be shifted into a position which essentially fills the gap 60 and thus reduces the pressure-effective gap width, as is to be illustrated by the position shown in broken lines and the double arrow 63.
  • the displacement of the bar 62 in the direction of the double arrow 63 is again used in the drawing, not shown, hydraulically operated piston / cylinder devices.
  • the pressure effective gap width WB of the gap 60 can be varied in that the mutually facing end regions of the support plates 27 ', 27 "can either be moved away from or towards the web 4, as is shown by the Double arrows 64, 65 and the dashed representations are to be clarified.
  • FIG. 5 schematically shows the design of the separation point 28 in a double belt press, in which the support plates 27 ', 27 "are formed in one piece, as has already been described above.
  • the pressure-reducing effect of the gap 60 is simulated in that the lower support plate 27 has three recesses 67, 67 ', 67 ", the shape of which corresponds essentially to the recesses 66, 66' according to FIG. 4.
  • the recesses 67, 67 ', 67 “have the effect that the lower support plate 27 can be elastically deformed by exerting a force in the direction of the double arrow 68 in such a way that a decompression area 69 of different lengths can optionally be generated between it and the upper support plate 26, which - as mentioned above - has a pressure-reducing effect which corresponds approximately to that of a gap between separate support plates.
  • both the lower support plates 27 ', 27 "(as in the embodiment according to FIG. 2) and the support plates 26', 26" are in the forward direction 16 the track is arranged displaceable relative to one another, as is to be illustrated by the double arrows 70.
  • the displacement serves two spindles 73, 73 'driven by electric motors 71, 71' via angular gears 72, 72 ', which engage in corresponding threaded bores 74, 74' provided in the support plates.
  • a control device 75 which adjusts the power which is supplied to the electric motors 71, 71 'as a function of the moisture of the material to be pressed which is measured by means of a detector 76 and which is a measure of the internal vapor pressure. controls.
  • the width of the gap 60 can be controlled in the sense of an equalization of the vapor pressure during the running production process. It goes without saying that, instead of the control, it is also possible to provide a control loop in the narrower sense, which comprises an actual / setpoint comparison.
  • FIGS. 6 and 7 corresponds to that according to FIG. 1, the description of which should be referred to in this regard.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Press Drives And Press Lines (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)

Abstract

L'invention concerne un procédé de production en continu de matière pressée à partir d'une matière première à presser ainsi qu'un dispositif adapté à la mise en oeuvre dudit procédé. Selon cette invention, des moyens permettent de réduire la pression exercée sur la matière première à travers une zone d'avance, à longueur réglable, de la section de presse.
PCT/EP2002/004949 2001-05-21 2002-05-06 Presse a double bande WO2002094521A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10124928.4 2001-05-21
DE2001124928 DE10124928A1 (de) 2001-05-21 2001-05-21 Doppelbandpresse

Publications (1)

Publication Number Publication Date
WO2002094521A1 true WO2002094521A1 (fr) 2002-11-28

Family

ID=7685729

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2002/004949 WO2002094521A1 (fr) 2001-05-21 2002-05-06 Presse a double bande

Country Status (2)

Country Link
DE (1) DE10124928A1 (fr)
WO (1) WO2002094521A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008122301A1 (fr) * 2007-04-05 2008-10-16 Kronoplus Technical Ag Plaques de roulement partielles dans une presse continue

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10261730A1 (de) * 2002-12-30 2004-07-08 Dieffenbacher Gmbh + Co. Kg Verfahren mit Anlage und kontinuierlich arbeitende Presse zur Herstellung von Holzwerkstoffplatten

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4420357A (en) * 1981-02-27 1983-12-13 Bison-Werke Bahre & Greten Gmbh & Co. Kg Apparatus and method for the manufacture of particleboard
DE3743933A1 (de) * 1987-12-23 1989-07-06 Dieffenbacher Gmbh Maschf Verfahren und vorrichtung zur beheizung einer kontinuierlich arbeitenden heizplattenpresse
US5284609A (en) * 1989-02-18 1994-02-08 Eduard Kusters Maschinenfabrik Gmbh & Co Kg Method and apparatus for the manufacture of wood chip boards and similar board materials
DE4446091A1 (de) * 1994-12-22 1996-06-27 Dieffenbacher Gmbh Maschf Pressengestell
DE19810304C1 (de) * 1998-03-10 1999-09-16 Kuesters Eduard Maschf Verfahren und Doppelbandpresse zur kontinuierlichen Herstellung von Plattenwerkstoffen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4420357A (en) * 1981-02-27 1983-12-13 Bison-Werke Bahre & Greten Gmbh & Co. Kg Apparatus and method for the manufacture of particleboard
DE3743933A1 (de) * 1987-12-23 1989-07-06 Dieffenbacher Gmbh Maschf Verfahren und vorrichtung zur beheizung einer kontinuierlich arbeitenden heizplattenpresse
US5284609A (en) * 1989-02-18 1994-02-08 Eduard Kusters Maschinenfabrik Gmbh & Co Kg Method and apparatus for the manufacture of wood chip boards and similar board materials
DE4446091A1 (de) * 1994-12-22 1996-06-27 Dieffenbacher Gmbh Maschf Pressengestell
DE19810304C1 (de) * 1998-03-10 1999-09-16 Kuesters Eduard Maschf Verfahren und Doppelbandpresse zur kontinuierlichen Herstellung von Plattenwerkstoffen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008122301A1 (fr) * 2007-04-05 2008-10-16 Kronoplus Technical Ag Plaques de roulement partielles dans une presse continue

Also Published As

Publication number Publication date
DE10124928A1 (de) 2002-12-05

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