EP0008566B1 - A method for supplying a liquid to a mat of wood particles to be pressed to boards, and an apparatus for carrying out the method - Google Patents

A method for supplying a liquid to a mat of wood particles to be pressed to boards, and an apparatus for carrying out the method Download PDF

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Publication number
EP0008566B1
EP0008566B1 EP79850060A EP79850060A EP0008566B1 EP 0008566 B1 EP0008566 B1 EP 0008566B1 EP 79850060 A EP79850060 A EP 79850060A EP 79850060 A EP79850060 A EP 79850060A EP 0008566 B1 EP0008566 B1 EP 0008566B1
Authority
EP
European Patent Office
Prior art keywords
mat
liquid
forming station
deposition
particles
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.)
Expired
Application number
EP79850060A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0008566A1 (en
Inventor
Jan-Olof Andersson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Casco AB
Original Assignee
Casco AB
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 Casco AB filed Critical Casco AB
Priority to AT79850060T priority Critical patent/ATE1334T1/de
Publication of EP0008566A1 publication Critical patent/EP0008566A1/en
Application granted granted Critical
Publication of EP0008566B1 publication Critical patent/EP0008566B1/en
Expired legal-status Critical Current

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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
    • B27N3/10—Moulding of mats
    • B27N3/14—Distributing or orienting the particles or fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/002—Manually-actuated controlling means, e.g. push buttons, levers or triggers
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
    • D21J1/00—Fibreboard
    • D21J1/04—Pressing

Definitions

  • the present invention relates to a method of feeding a liquid to a mat of wood particles and the like, where the liquid is fed in a constant amount per time unit and in timed relation with the operation of the forming station for depositing the wood particles to form a mat.
  • the invention further relates to an apparatus for carrying out the method.
  • the mat carrier can consist of a continuous conveyor or of separate press platens, which platens are transported on a continuous conveyor.
  • the formed mat of particles is then passed into a heating press, optionally after having passed a device for splitting the particle mat into sections to be pressed.
  • the press can be of the single-opening kind, the multiple-opening kind or it can be continuous.
  • the glue in the glued particles will be cured under the influence of the heat and pressure in the press and a board material is obtained.
  • the particles In order to obtain reproducible results during the curing process, it is essential that the particles have a certain moisture content.
  • the moisture content can be adjusted with respect to the used glue and generally it does not exceed 14 per cent by weight.
  • a steam jet effect is produced and this shortens the press time. If the moisture content is too high, this steam jet can cause delamination of the pressed particle material.
  • Swedish Patent 398 075 discloses a device, where the speed of the mat conveyor is registered and the liquid addition is adjusted with respect thereto.
  • the problem of obtaining a uniform distribution of the liquid on the top-side and/or under-side of the particle mat has been solved by moving the supply means in synchronism and simultaneously with the forming station and supply during the deposition of the particles from the forming station a constant amount of liquid per time unit to at least one of the sides of the mat and that thereafter, when the forming station is returning to the starting position, the liquid supply is stopped.
  • the invention is applicable to any forming station for particle or fibre material, when it is desired to spray the mat with a liquid.
  • Important fields of application are the production of fibre boards and especially particle boards.
  • the forming stations can be of several different kinds. At the production of fibre boards sheets are often formed from a suspension and the liquid is then added primarily to supply surface modifying additives.
  • the material can also be deposited dry or with admixed glue or other additives only. The material can then be deposited over a certain length of the mat, directly on this, usually in the form of several layers of different qualities, or over a greater length of the mat by whirling the material and depositing this in a special chamber equipped with fans.
  • the invention will below be described primarily for the production of particle boards from dry or merely moistened particles by deposition on a conveyor, which constitutes the most important field of application of the present invention.
  • the forming station for the production of a particle mat connected with the mat conveyor, is adapted to give a uniformly deposited mat at any operation conditions, and great demands are made on the accuracy of this apparatus since a particle mat, which has not been uniformly deposited, does not give acceptable finished board materials.
  • the forming station is run by a driving motor, while the particle deposition is achieved by a separate motor.
  • the amount of deposited particles must be constant, at the same time as the driving motor must run the forming station at a constant speed. The least deviation from the predetermined operating conditions will inevitably bring about variations in the thickness of the deposited particle mat and this will in its turn result in a non-uniform weight by unit of volume of the particle bed during the subsequent pressing, which might lead to cassation.
  • liquid outlet means in fixed connection with the forming station, according to the present invention, these means will move at the same speed as the forming station, which, as has been mentioned above, must move at a constant speed, in order that a uniform particle mat will be obtained. Since the addition of the liquid is synchronous with the operation of the forming station, a uniform addition of liquid over the entire particle mat will be attained. A uniform liquid distribution on the entire top-side and/or under-side of the particle mat is thus obtained hereby, and this distribution is completely independent of the non-uniform speed of the mat conveyor at.start and stop.
  • the operation of the liquid addition equipment is started synchronously with the motor for particle deposition in the forming station, since liquid is to be added only during the period of particle deposition and not during the return of the forming station to the terminal position. It is, however, within the scope of the invention, that the liquid addition equipment is started synchronously with the driving motor for the forming station, provided that suitable switching means are provided, which means ensure, that no addition is obtained at the return of the forming station to the terminal position.
  • the means for liquid feeding are to be arranged in fixed connection to the forming station, implies, according to the invention, that there must not be any essential time delay of the movement of the forming station with respect to the movement of the outlet devices, which means, that these devices might be placed at a distance from the forming station, if required. It is, however, preferred that the means for supplying liquid are fixedly attached to the forming station. In some cases the mat conveyor is also moved during deposition when the forming station is moving and this is within the scope of the invention.
  • the liquid is usually added; finely divided by means of spray nozzles.
  • the liquid can in a known manner contain other additives, commonly used at board production, such as surface modifying agents, e.g. wax dispersions, gloss agents, anti-tack agents, agents for regulation of the curing of the glued particles or formaldehyde absorbing- agents.
  • surface modifying agents e.g. wax dispersions, gloss agents, anti-tack agents, agents for regulation of the curing of the glued particles or formaldehyde absorbing- agents.
  • the liquid can according to the invention be supplied to the top-side and/or under-side of the particle--mat depending on the fact, whether the liquid supply means, which are turned towards the mat conveyer, have been arranged on either or both sides of the forming station.
  • the position of the nozzles with respect to the forming station is not critical at the deposition of continuous mats, as long as their relative movement with respect to the mat is uniform with that of the station. For practical reasons and from considerations of space, it is suitable to place the nozzles as near as possible to the place of particle deposition.
  • the particle deposition device often has a relatively great extension in the longitudinal direction of the bed, particularly when the particles are whirled before the deposition, and if it in this case is desired to spray the surface or the surfaces of the bed, the nozzles must be placed outside the area for particle deposition and thus at a considerable distance from the centre of the particle supply.
  • the nozzles for spraying the bed conveyor, the means for particle deposition and the nozzles for spraying the top-side of the bed, respectively, will sweep over different sections of the mat.
  • the particle deposition as well as the spraying will, however, continue, where they were previously interrupted, so that a continuous distribution of both particles and liquid willbe obtained along the path. Both the particle deposition and the spraying are generally satisfactorily tuned and no irregularities of any consequences for the final quality of the board will be caused.
  • the liquid outlet means can be known devices for feeding liquids, e.g. nozzles or spray nozzles, and should have several atomizing nozzles or spray nozzles, the number being adapted to the width of the particle mat, the spraying angle and the height of the device to the mat.
  • the positioning is intended to give a uniform distribution of the liquid over the width of the mat, which can be difficult with respect to the fact, that the amount of applied liquid often is rather small.
  • the spray areas covered by the nozzles should be adjusted to partial overlapping.
  • nozzles which give oval spraying patterns are used and the major axis of the ovals are oriented across the longitudinal direction of the bed, in order that the overlapping can be enlarged without increasing the spray jets in the longitudina-I direction of the bed.
  • the extension of the spray pattern in the longitudinal direction of the bed is set by the fact, that it must not be so great, that a uniform distribution over the surface cannot be obtained and not so small, that minor variations in the relative movement between the bed and the nozzles, particularly in the seams between the different applying sections, will give rise to great variations in the sprayed amount.
  • a suitable extension of the spray patterns of the nozzles in the longitudinal direction of the bed is between 5 and 50 cm and preferably between 10 and 30 cm.
  • the liquid can be supplied by means of compressed air via a dosage pump or other known dosage equipment, comprising pressure equalizing vessels and magnetic valves.
  • the dosage pump should, in order to obtain the most uniform distribution, be of that kind, which gives a fairly constant volume feed, independent of the back pressure, and can e.g. be a diaphragm pump.
  • Special pressure equalizing vessels are sometimes superfluous, e.g. if the conduit systems have such a flexibility, that a certain volume of liquid under pressure can be contained therein.
  • Magnetic valves are preferred, as they give a rapid response to opening and closing impulses. They should be placed as near the nozzles as possible to obtain the fastest response.
  • the dosage means and optional magnetic valves are suitably electrically operated, in such a manner that they work simultaneously with the particle deposition from the forming apparatus. Normally the particle deposition is started a second or so before the relative motion between the forming station and the bed is commenced in order to eliminate the effects of dead-time, and it has often been found suitable to start the nozzles at the same time as the particle deposition. Adjustment and selection of start and stop points must, however, be made individually for each installation.
  • the invention also relates to a device for carrying out the above described process, said device comprising a movable forming station, which at least on one side is provided with liquid supply means, the driving device of the latter being connected for synchronous operation with the forming station.
  • a movable forming station which at least on one side is provided with liquid supply means, the driving device of the latter being connected for synchronous operation with the forming station.
  • both of the sides of the forming station which are turned towards the particle mat, are provided with liquid supply means, preferably nozzles or spray nozzles.
  • the spray nozzles on each side of the forming station are fed by a dosage pump via a magnetic valve on the respective feed pipe and the pump and the magnetic valves are connected for simultaneous operation with the driving device of the forming station for the deposition of particles.
  • a double dosage pump is used and each half of the pump feeds the supply means on the respective side.
  • FIG. 1 is a side-view of an installation for the production of particle boards with a forming station provided with and connected to liquid dosage means, according to the invention.
  • Guide roller 4 can be driven by a motor 6 in the direction of the arrow.
  • the upper part of the mat conveyor 1 can be passed through a heating press 9.
  • a strewing forming station 10 which can be replaced by any other known forming device, a particle mat 11 is formed on the conveyor.
  • the forming station 10 moves on rollers 14 over guide rails 15 and hereby moves from its terminal position by means of a driving motor 10a in the direction of the arrow 12. Instantaneous with this movement particles are deposited on the mat by means of a particle depositing device 13, likewise driven by a motor 13a.
  • nozzles 17a and 17b are fixedly fitted, and these are connected to a dosage device 18, consisting of a double diaphragm pump, to which liquid is fed from preparation vessels 19a and b.
  • a dosage device 18 consisting of a double diaphragm pump, to which liquid is fed from preparation vessels 19a and b.
  • connection conduit metering glasses 20a and b are arranged and are connected via three-way valves 21 a and b.
  • magnetic valves 23a and b are connected to the respective conduit. If the spray nozzles are operated by compressed air, this is conveyed to these from a pump 45 via a filter 46 and a reducing valve 49.
  • the compressed air can either be operated synchronous with the dosage pump 17 or be continuously connected.
  • the motor of the dosage pump 18a and the magnetic valves are operated synchronous with the particle depositing device 13 in such a manner, that the pump 18 starts and the magnetic valves 23 are opened, when the motor of the device is started. This is obtained by connection 24a and b of the motor 13a, the pump motor 18a and the magnetic valves via the same control switch 24.
  • the motor of the particle depositing device is stopped, and when the control current to this is switched off, the current to the pump is switched off at the same time and the magnetic valves 23 are closed, whereby the liquid supply ceases.
  • the forming station thereafter returns to the terminal station by means of the driving motor without working of the particle deposition device, and thereby of the liquid dosage device.
  • the press 9 is closed.
  • An intervening space, free from particles, can, if desired, at the same time be formed between the sections of the mat, which are to be cut by means of a brush, saw or the like 16, which is moved at right angles across the width of the particle mat.
  • the forming apparatus When the bed conveyor has conveyed the particle mat, deposited from the forming apparatus into the press, the forming apparatus is started anew at the relative position on the particle mat, where it was stopped in the preceding working step and here the dosage device also starts the liquid supply. The spraying thus also starts at the point, where it was previously interrupted.
  • the amount of added liquid is during operation, adjusted with respect to the thickness of the particle mat, i.e. with respect to the speed of the forming apparatus.
  • One advantage of the present process is that, if e.g. a thicker particle mat is desired, thereby giving resulting thicker board materials, it is only required that the speed of the driving motor for the forming apparatus is reduced, whereby the thickness of the particle mat will increase. As the forming station thereby will move slower, while the liquid supply equipment still supplies the same amount of liquid per time unit, the thicker particle mat will be sprayed with more liquid without requirements on adjustment of the dosage equipment.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Detergent Compositions (AREA)
  • Soy Sauces And Products Related Thereto (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
EP79850060A 1978-07-14 1979-06-15 A method for supplying a liquid to a mat of wood particles to be pressed to boards, and an apparatus for carrying out the method Expired EP0008566B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT79850060T ATE1334T1 (de) 1978-07-14 1979-06-15 Verfahren zum auftragen einer fluessigkeit auf ein vlies aus holzspaenen, das zu platten gepresst werden soll, und vorrichtung zur durchfuehrung dieses verfahrens.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE7807865A SE411863B (sv) 1978-07-14 1978-07-14 Sett vid tillforsel av vetska till en bedd av trepartiklar avsedd att pressas till skivor, samt en anordning for genomforande av forfarandet
SE7807865 1978-07-14

Publications (2)

Publication Number Publication Date
EP0008566A1 EP0008566A1 (en) 1980-03-05
EP0008566B1 true EP0008566B1 (en) 1982-07-14

Family

ID=20335452

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79850060A Expired EP0008566B1 (en) 1978-07-14 1979-06-15 A method for supplying a liquid to a mat of wood particles to be pressed to boards, and an apparatus for carrying out the method

Country Status (8)

Country Link
EP (1) EP0008566B1 (es)
AT (1) ATE1334T1 (es)
DE (1) DE2963338D1 (es)
DK (1) DK295579A (es)
ES (1) ES8100967A1 (es)
FI (1) FI69590C (es)
NO (1) NO155759C (es)
SE (1) SE411863B (es)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011104595A1 (en) 2010-02-26 2011-09-01 RODRÍGUEZ FERNÁNDEZ, Antonio Control system and method for a thermal circuit

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4142438A1 (de) * 1991-12-20 1993-06-24 Baehre & Greten Platte und verfahren zu deren herstellung
DE19640622C2 (de) * 1996-10-01 1998-11-12 Moeller Plast Gmbh Baustoff und Verfahren sowie Vorrichtung zur Herstellung eines Baustoffs
US6159879A (en) * 1996-10-01 2000-12-12 Moeller Plast Gmbh Building material made from bast fibers, shives, and a binder
BE1028850B1 (de) * 2021-09-09 2022-06-28 Zhaoqing Powerunity Tech Development Co Ltd Wasserabweisungsmittel und Verfahren zu seiner Herstellung sowie Vorrichtung zur Herstellung eines wasserabweisenden Mittels

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2583618A (en) * 1948-07-23 1952-01-29 Rock Island Millwork Company Production of hot-molded articles from wood sawdust
CH431054A (de) * 1963-02-22 1967-02-28 Baehre Metallwerk Kg Verfahren und Vorrichtung zum Herstellen von Platten aus Material, das aus span- oder faserförmigen Teilen besteht
BE790524A (fr) * 1971-10-25 1973-02-15 Baehre & Greten Dispositif pour la fabrication de panneaux de copeaux agglomeres, realises a partir de particules de copeaux ou de fibres melangees a un lian
DE2421284B2 (de) * 1974-05-02 1976-09-02 Bison-Werke Bahre und Greten GmbH & Co KG, 3257 Springe Vorrichtung zum beaufschlagen der oberseite eines der herstellung von spanplatten o.dgl. dienenden vlieses mit einem fluessigkeitsnebel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011104595A1 (en) 2010-02-26 2011-09-01 RODRÍGUEZ FERNÁNDEZ, Antonio Control system and method for a thermal circuit

Also Published As

Publication number Publication date
FI792109A (fi) 1980-01-15
ATE1334T1 (de) 1982-07-15
ES482470A0 (es) 1980-12-01
FI69590C (fi) 1986-03-10
EP0008566A1 (en) 1980-03-05
NO155759C (no) 1987-05-27
ES8100967A1 (es) 1980-12-01
DK295579A (da) 1980-01-15
SE411863B (sv) 1980-02-11
SE7807865L (es) 1980-01-15
FI69590B (fi) 1985-11-29
NO155759B (no) 1987-02-16
NO792352L (no) 1980-01-15
DE2963338D1 (en) 1982-09-02

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