WO1997034748A2 - Procede et dispositif de chauffage pour prechauffer de mats constitues de copeaux ou de fibres - Google Patents

Procede et dispositif de chauffage pour prechauffer de mats constitues de copeaux ou de fibres Download PDF

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Publication number
WO1997034748A2
WO1997034748A2 PCT/EP1997/001155 EP9701155W WO9734748A2 WO 1997034748 A2 WO1997034748 A2 WO 1997034748A2 EP 9701155 W EP9701155 W EP 9701155W WO 9734748 A2 WO9734748 A2 WO 9734748A2
Authority
WO
WIPO (PCT)
Prior art keywords
air
housing
fleece
heating device
air inlet
Prior art date
Application number
PCT/EP1997/001155
Other languages
German (de)
English (en)
Other versions
WO1997034748A3 (fr
Inventor
Herbert G. Nopper
Hubert F. Schmidt
Original Assignee
Picon Schmidt & Co Gmbh
Nopper Herbert G
Schmidt Hubert F
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 Picon Schmidt & Co Gmbh, Nopper Herbert G, Schmidt Hubert F filed Critical Picon Schmidt & Co Gmbh
Priority to AT97907080T priority Critical patent/ATE257065T1/de
Priority to AU19260/97A priority patent/AU1926097A/en
Priority to EP97907080A priority patent/EP0958117B1/fr
Priority to DE59711171T priority patent/DE59711171D1/de
Publication of WO1997034748A2 publication Critical patent/WO1997034748A2/fr
Publication of WO1997034748A3 publication Critical patent/WO1997034748A3/fr

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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
    • B27N3/18—Auxiliary operations, e.g. preheating, humidifying, cutting-off

Definitions

  • the invention relates to a method for preheating nonwovens from chips or fibers in the production of chipboard and fiberboard or molded parts, and to a heating device for carrying out such a method.
  • chipboard and fiberboard or molded parts For the production of chipboard and fiberboard or molded parts, raw materials processed into chips or fibers, such as primarily wood, but also straw and other annual plants, are wetted with a binder in a gluing system and sprinkled into a fleece.
  • the finished chipboard and fiberboard or the molded part is produced by introducing the fleece into a hot press which compresses and heats the fleece and thereby gives the end product the intended shape and strength.
  • the invention is based on the object of proposing a method and a heating device for preheating nonwovens made of chips or fibers, which make pre-pressing in front of the hot press unnecessary and optimize the efficiency of the hot press.
  • This object is achieved in a method of the type mentioned at the outset by first introducing the nonwoven on a gas-permeable nonwoven base into a housing with an air inlet and an air outlet and positioning it such that the air inlet above the nonwoven and the air outlet below the nonwoven base lie, the fleece essentially dividing the interior of the housing into two.
  • the air pressure below the fleece is then reduced by suction of air through the air outlet, so that air flows from the housing interior above the fleece through the fleece and the fleece base into the housing interior below the fleece.
  • the air flowing into the interior of the housing through the air inlet is previously heated.
  • a heating device for carrying out this method, which has a housing with an air inlet at the top and an air outlet at the bottom.
  • a gas-permeable nonwoven underlay is provided which is positioned in the housing between the air inlet and the air outlet in such a way that it essentially divides the interior of the housing into a vacuum chamber and an afterflow chamber.
  • the heating device also has a suction device arranged downstream of the air outlet for lowering the air pressure in the vacuum chamber and an air flow heater upstream of the air inlet.
  • the loosely scattered fleece is flowed through by hot air, whereby the core temperature of the fleece is raised to the temperature necessary for the hardening of the binder within a fraction of the heating time of the hot press, possibly within a few seconds.
  • This has the particular advantage that - in contrast to contact heating in the hot press - there is no temperature gradient within the fleece, but that the temperature within the fleece volume is the same everywhere.
  • the processing time in the subsequent hot press is considerably reduced.
  • the hot air is sucked through the fleece by means of a vacuum below the fleece underlay.
  • This offers the advantage that the individual fibers of the fleece are not whirled up by air turbulence on the fleece surface. Because the vacuum creates an air flow that is directed downwards at each point of the fleece to the fleece base.
  • the process has the further effect that the pressure gradient which forms in the nonwoven causes the nonwoven to be pre-compressed.
  • the method can be expanded in that an air-impermeable cover is at least temporarily placed on the top of the fleece.
  • the force resulting from the pressure difference between the top of the fleece and the bottom of the fleece backing acts on the entire fleece volume, which results in a stronger compression.
  • the conveyor belt for the nonwovens which is present anyway, is made gas-permeable and is guided through the housing as a nonwoven underlay.
  • the lowering of the air pressure below the fleece can take place in cyclical operation, the housing being temporarily sealed against the conveyor belt.
  • the temporary sealing of the housing ensures that no cold outside air, but only hot air flowing through the air inlet is drawn through the fleece.
  • two openings that can be locked clock-synchronously can be provided in the side of the housing wall.
  • the heating device according to the invention is preferably developed in such a way that the air outlet is connected to the air inlet outside the housing to form an air circuit.
  • a development of the heating device with an air inlet flap at the air inlet and an air outlet flap at the air outlet of the housing is particularly preferred, which can be actuated synchronously to temporarily deflect the circulating air flow into at least one flow channel surrounding the housing.
  • This enables a trouble-free cycle operation of the heating device, since the circulating hot air flow does not flow through the housing but around the housing when loading by closing the air inlet flap and the air outlet flap.
  • Contact with the hot air flow keeps the housing at the desired temperature and there is no disruptive flow when charging the heating device.
  • the housing and the flow channel of the heating device are preferably surrounded by a heat-insulated casing. This further improves the efficiency of the heating device.
  • the suction device and the air flow heating can also be arranged within this casing.
  • the nonwoven base can be a gas-permeable conveyor belt, the housing and optionally the casing of the heating device having an inlet opening and an outlet opening for the passage of the conveyor belt.
  • a heating device with an air inlet flap and preferably an air outlet flap and a flow channel
  • the inlet opening and the outlet opening for the gas-permeable conveyor belt can be sealed in connection with the actuation of the air inlet flap and possibly the air outlet flap.
  • Such a heating device can be operated in cycle mode without problems.
  • a further preferred development of the heating device has a dust filter at least between the fleece base and the air outlet.
  • a dust filter is particularly important when using wood flour fleece, since wood dust which is released from the wood flour fleece into the air flow must be retained because of the risk of deflagration. It is advantageous if a filter belt is used which surrounds the non-woven base on at least four sides.
  • the nonwoven underlay can consist of a flexible metal mesh which is gas-permeable and at the same time so stable that it can also be used as a conveyor belt.
  • a wood flour fleece was sprinkled with a thickness of 35 mm onto a flexible metal mesh.
  • the initial temperature was 20 ° to 22 ° C.
  • Below the fleece base the air pressure was reduced by 7,300 Pa and the air flowing in was heated to 95 to 97 ° C. With a heating time of around 25 seconds, the entire volume of the wood flour fleece was preheated to 70 to 80 ° C.
  • a straw-shavings-fiber mixture was sprinkled with a thickness of 120 mm on a flexible metal mesh.
  • the initial temperature of the fleece was approx. 20 ° C.
  • the fleece base was reduced by 1,200 Pa and the inflowing air was heated to approx. 95 ° C.
  • the fleece was pre-compressed in addition to the preheating to such an extent that its thickness decreased by 20 mm. This compression could be done by placing an air impermeable Covering should be increased to such an extent that the thickness of the fleece was permanently reduced by 45 mm.
  • Figure 1 is a simplified sectional view of a heater from vor ⁇ ne
  • FIG. 2 shows the heating device from FIG. 1 in a different operating state
  • FIG. 3 shows a side view of the heating device from FIG. 1.
  • the heating device shown in FIG. 1 consists of a housing 1 with an air inlet 2 and an air outlet 3, which sits together with the suction device 4 and the air flow heater 5 in a heat-insulated casing 6.
  • a fleece 7 which is sprinkled onto a gas-permeable fleece base 8 and together with this divides the housing interior 9 into a vacuum chamber 10 and an afterflow chamber 11 located below.
  • the fleece 7 on the fleece base 8 is surrounded by a gas-permeable filter band 12.
  • the housing 1 has an air inlet flap 13 at its air inlet 2 and an air outlet flap 14 at its air outlet 3.
  • a flow channel 15 is guided around the housing and continues in the return channel 16. Outside the casing 6, a base 17 and an electric motor 18 for the suction device 4 designed as a fan are shown.
  • FIG. 2 shows the same heating device as in FIG. 1, but here the air inlet flap 13 and the air outlet flap 14 of the housing 1 are closed.
  • the suction device 4 continues to run, the housing interior 9 is now uncoupled from the air circuit.
  • the air heated by the air flow heater 5 no longer flows through the housing 1, but in the flow channel 15 along the outer wall of the housing 1 and via the return duct 16 back into the suction device 4.
  • the housing 1 can now be formed without a disturbing air flow are opened, cooling of the housing 1 due to the hot air flow being avoided.
  • the heating device can be operated in cycles alternating between the operating state shown in FIG. 1, in which the fleece is preheated, and the operating state shown in FIG. 2, in which loading of the heating device is possible.
  • the gas-permeable nonwoven underlay 8 is designed as a conveyor belt.
  • the casing 6 and the housing 1 have an inlet opening 19 and an outlet opening 20. Both the inlet opening 19 and the outlet opening 20 can be sealed in cycles.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Nonwoven Fabrics (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Preliminary Treatment Of Fibers (AREA)

Abstract

L'invention concerne un procédé pour préchauffer des mats constitués de copeaux ou de fibres, lors de la fabrication de panneaux d'agglomérés et de panneaux de fibres ou de pièces moulées, ainsi qu'un dispositif de chauffage pour la mise en oeuvre de ce procédé. Le mat (7) est déposé sur un substrat (8) perméable aux gaz, dans un boîtier (1) présentant une entrée d'air (2) supérieure et une sortie d'air (3) inférieure, et est positionné de sorte qu'il divise l'intérieur (9) du boîtier principalement en une chambre inférieure à dépression (10) et une chambre supérieure de circulation d'air (11). La pression de l'air dans la chambre à dépression (10) est réduite par un dispositif d'aspiration (4) relié à la sortie d'air (3), de sorte que l'air provenant de la chambre de circulation d'air (11) passe à travers le mat (7) et le substrat (8) pour pénétrer dans la chambre à dépression (10). L'air qui passe à travers l'entrée d'air (2) dans la chambre de circulation d'air (11) est tout d'abord réchauffé au moyen d'un élément chauffant (5) placé dans le flux d'air.
PCT/EP1997/001155 1996-03-19 1997-03-07 Procede et dispositif de chauffage pour prechauffer de mats constitues de copeaux ou de fibres WO1997034748A2 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AT97907080T ATE257065T1 (de) 1996-03-19 1997-03-07 Verfahren und heizvorrichtung zum vorerwärmen von vliesen aus spänen oder fasern
AU19260/97A AU1926097A (en) 1996-03-19 1997-03-07 Method and device for preheating mats of chips or fibres
EP97907080A EP0958117B1 (fr) 1996-03-19 1997-03-07 Procede et dispositif de chauffage pour prechauffer de mats constitues de copeaux ou de fibres
DE59711171T DE59711171D1 (de) 1996-03-19 1997-03-07 Verfahren und heizvorrichtung zum vorerwärmen von vliesen aus spänen oder fasern

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19610755.5 1996-03-19
DE19610755A DE19610755A1 (de) 1996-03-19 1996-03-19 Verfahren und Heizvorrichtung zum Vorerwärmen von Vliesen aus Spänen oder Fasern

Publications (2)

Publication Number Publication Date
WO1997034748A2 true WO1997034748A2 (fr) 1997-09-25
WO1997034748A3 WO1997034748A3 (fr) 1997-11-13

Family

ID=7788736

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1997/001155 WO1997034748A2 (fr) 1996-03-19 1997-03-07 Procede et dispositif de chauffage pour prechauffer de mats constitues de copeaux ou de fibres

Country Status (5)

Country Link
EP (1) EP0958117B1 (fr)
AT (1) ATE257065T1 (fr)
AU (1) AU1926097A (fr)
DE (2) DE19610755A1 (fr)
WO (1) WO1997034748A2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19740338A1 (de) * 1997-09-13 1999-03-18 Truetzschler Gmbh & Co Kg Vorrichtung zum Herstellen eines Faservlieses, z. B. aus Baumwolle, Chemiefasern, Fasermischungen u. dgl.
DE10230191B4 (de) * 2002-07-05 2004-09-02 Herbert Georg Nopper Verfahren und Vorrichtung zum Verpressen von Vliesen aus Streugut
FR3037640B1 (fr) 2015-06-19 2017-06-16 Saint Gobain Isover Etuve de reticulation d'un matelas continu de fibres minerales ou vegetales

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4273981A (en) * 1978-10-17 1981-06-16 Casimir Kast Gmbh & Co. K.G. Apparatus for heating a fleece
DE3640682A1 (de) * 1986-11-28 1988-06-09 Baehre & Greten Verfahren und vorrichtung zum kontinuierlichen vorwaermen eines vlieses fuer die herstellung von span-, faser- oder dergleichen platten
DE4333614A1 (de) * 1993-10-01 1995-04-06 Dieffenbacher Gmbh Maschf Verfahren und Anlage zur kontinuierlichen Herstellung von Spanplatten
WO1995020473A1 (fr) * 1994-01-28 1995-08-03 Sunds Defibrator Industries Ab Procede de fabrication de panneaux lignocellulosiques

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4273981A (en) * 1978-10-17 1981-06-16 Casimir Kast Gmbh & Co. K.G. Apparatus for heating a fleece
DE3640682A1 (de) * 1986-11-28 1988-06-09 Baehre & Greten Verfahren und vorrichtung zum kontinuierlichen vorwaermen eines vlieses fuer die herstellung von span-, faser- oder dergleichen platten
DE4333614A1 (de) * 1993-10-01 1995-04-06 Dieffenbacher Gmbh Maschf Verfahren und Anlage zur kontinuierlichen Herstellung von Spanplatten
WO1995020473A1 (fr) * 1994-01-28 1995-08-03 Sunds Defibrator Industries Ab Procede de fabrication de panneaux lignocellulosiques

Also Published As

Publication number Publication date
EP0958117A2 (fr) 1999-11-24
WO1997034748A3 (fr) 1997-11-13
ATE257065T1 (de) 2004-01-15
AU1926097A (en) 1997-10-10
DE19610755A1 (de) 1997-09-25
DE59711171D1 (de) 2004-02-05
EP0958117B1 (fr) 2004-01-02

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