EP0958117A2 - Method and device for preheating mats of chips or fibres - Google Patents
Method and device for preheating mats of chips or fibresInfo
- Publication number
- EP0958117A2 EP0958117A2 EP97907080A EP97907080A EP0958117A2 EP 0958117 A2 EP0958117 A2 EP 0958117A2 EP 97907080 A EP97907080 A EP 97907080A EP 97907080 A EP97907080 A EP 97907080A EP 0958117 A2 EP0958117 A2 EP 0958117A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- air
- housing
- fleece
- heating device
- air inlet
- 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
Links
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.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19610755 | 1996-03-19 | ||
DE19610755A DE19610755A1 (en) | 1996-03-19 | 1996-03-19 | Method and heating device for preheating nonwovens made of chips or fibers |
PCT/EP1997/001155 WO1997034748A2 (en) | 1996-03-19 | 1997-03-07 | Method and device for preheating mats of chips or fibres |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0958117A2 true EP0958117A2 (en) | 1999-11-24 |
EP0958117B1 EP0958117B1 (en) | 2004-01-02 |
Family
ID=7788736
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97907080A Expired - Lifetime EP0958117B1 (en) | 1996-03-19 | 1997-03-07 | Method and device for preheating mats of chips or fibres |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0958117B1 (en) |
AT (1) | ATE257065T1 (en) |
AU (1) | AU1926097A (en) |
DE (2) | DE19610755A1 (en) |
WO (1) | WO1997034748A2 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19740338A1 (en) * | 1997-09-13 | 1999-03-18 | Truetzschler Gmbh & Co Kg | Device to form nonwovens |
DE10230191B4 (en) * | 2002-07-05 | 2004-09-02 | Herbert Georg Nopper | Method and device for pressing nonwovens from grit |
FR3037640B1 (en) | 2015-06-19 | 2017-06-16 | Saint Gobain Isover | ETCH FOR CROSSLINKING A CONTINUOUS MATTRESS OF MINERAL OR VEGETABLE FIBERS |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2845080C2 (en) * | 1978-10-17 | 1981-10-08 | Casimir Kast Gmbh & Co Kg, 7562 Gernsbach | Device for heating a fleece |
DE3640682A1 (en) * | 1986-11-28 | 1988-06-09 | Baehre & Greten | Method and apparatus for continuously preheating a mat for the manufacture of particle, fibre or like boards |
DE4333614C2 (en) * | 1993-10-01 | 1999-02-25 | Dieffenbacher Gmbh Maschf | Process and plant for the continuous production of chipboard |
SE502272C2 (en) * | 1994-01-28 | 1995-09-25 | Sunds Defibrator Ind Ab | Process for making lignocellulosic discs |
-
1996
- 1996-03-19 DE DE19610755A patent/DE19610755A1/en not_active Withdrawn
-
1997
- 1997-03-07 DE DE59711171T patent/DE59711171D1/en not_active Expired - Lifetime
- 1997-03-07 WO PCT/EP1997/001155 patent/WO1997034748A2/en active IP Right Grant
- 1997-03-07 AU AU19260/97A patent/AU1926097A/en not_active Abandoned
- 1997-03-07 AT AT97907080T patent/ATE257065T1/en active
- 1997-03-07 EP EP97907080A patent/EP0958117B1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9734748A2 * |
Also Published As
Publication number | Publication date |
---|---|
WO1997034748A2 (en) | 1997-09-25 |
AU1926097A (en) | 1997-10-10 |
EP0958117B1 (en) | 2004-01-02 |
DE19610755A1 (en) | 1997-09-25 |
DE59711171D1 (en) | 2004-02-05 |
ATE257065T1 (en) | 2004-01-15 |
WO1997034748A3 (en) | 1997-11-13 |
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