EP0137450A1 - Procédé et dispositif pour mouiller des matières solides versables - Google Patents

Procédé et dispositif pour mouiller des matières solides versables Download PDF

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Publication number
EP0137450A1
EP0137450A1 EP84111857A EP84111857A EP0137450A1 EP 0137450 A1 EP0137450 A1 EP 0137450A1 EP 84111857 A EP84111857 A EP 84111857A EP 84111857 A EP84111857 A EP 84111857A EP 0137450 A1 EP0137450 A1 EP 0137450A1
Authority
EP
European Patent Office
Prior art keywords
liquid substance
container
spray
pressure
sprayed
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
EP84111857A
Other languages
German (de)
English (en)
Other versions
EP0137450B1 (fr
Inventor
Wilhelm Dipl.-Ing. Oldemeyer
Franz-Josef Stelte
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.)
Gebrueder Loedige Maschinenbau GmbH
Original Assignee
Gebrueder Loedige Maschinenbau GmbH
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 Gebrueder Loedige Maschinenbau GmbH filed Critical Gebrueder Loedige Maschinenbau GmbH
Priority to AT84111857T priority Critical patent/ATE31394T1/de
Publication of EP0137450A1 publication Critical patent/EP0137450A1/fr
Application granted granted Critical
Publication of EP0137450B1 publication Critical patent/EP0137450B1/fr
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
    • B27N1/00—Pretreatment of moulding material
    • B27N1/02—Mixing the material with binding agent
    • B27N1/029—Feeding; Proportioning; Controlling

Definitions

  • the invention relates to a method for moistening pourable solids, for example for gluing chips, in which a liquid substance is divided into the finest droplets and fed to the solid under high pressure.
  • the invention also relates to a device for moistening pourable solids which is intended for carrying out this method and which has a container for holding the solids, a mixer for moving and loosening the solids in the container and at least one device for spraying the liquid substance brought up from a storage container.
  • Glue is sprayed onto chips under high pressure if you want to achieve an airless glue distribution, i.e. no two-substance system wishes.
  • the airless glue division has several advantages. This avoids glue mists that occur in a two-substance system consisting of air and glue and lead to heavy soiling of the machines in which the chips are glued. Glue mist is also harmful to the operator of the machine. For this reason, for example, isocyanates should not be processed in dual-substance systems at all.
  • Spraying liquids under high pressure is known and is used industrially.
  • the liquid to be sprayed is fed to the spraying device in a constant amount, as is the case, for example, with paints.
  • the amount of the substance to be sprayed has to be changed in the course of operation, for example as a consequence of another changing variable. This is the case, for example, with chip gluing if the chips to be glued are not produced in uniform quantities.
  • the weight of the amount of chips fed to a gluing device is the key parameter for gluing, while the amount of flowable substance or glue sprayed on is a consequential quantity because the glue has to be added to the chips in a fixed ratio.
  • the invention has for its object when moistening pourable solids with the aid of liquid supplied under high pressure Substance to maintain a constant quantitative ratio between solids and sprayed liquid substance to be able to keep the pressure with which the liquid substance is essentially constant.
  • the liquid substance to be sprayed is not supplied continuously with fluctuating pressure which adjusts to the amount of chips to be sprayed, but rather in pulse form, the length of the individual pulses and / or their time interval being the amount of supplied and sprayed liquid substance determines or regulates. If a large amount of liquid substance is required, the impulses of the liquid supply are longer than the pause times or the interval between the individual impulses decreases, while with decreasing fluid requirement the impulse length decreases or the interval between successive impulses increases. In this way, the spray pattern of the nozzles can be kept constant despite fluctuating amounts of the liquid substance supplied, because the liquid substance is always supplied and sprayed at intervals under approximately constant pressure.
  • the intermittent feeding and spraying of liquid substance is preferably carried out with a predetermined pulse frequency. It is Particularly useful to regulate the amount of liquid substance to be sprayed to change the length of the spray pulses within a constant pulse frequency, which can be easily achieved with an electronic control. But you can also change the pulse frequency itself to regulate the amount of liquid substance to be sprayed. Finally, a change in both the pulse duration and the pulse frequency for the control is also conceivable if one or the other type of control is not sufficient in itself.
  • the spray nozzles provided according to the invention can be designed like known spray guns, i.e. contain a piston-shaped or needle-shaped closing body which cooperates with the inner end of the outlet opening of the spray nozzle.
  • a controllable opening and closing shut-off valve is provided in the compressed air line of the actuating cylinder.
  • the spray nozzles of the device are constantly connected to a high-pressure line for the liquid substance to be sprayed, the liquid substance under constant pressure circulating through this high-pressure line.
  • This is a closed system from which the liquid substance can only escape in a targeted and controlled manner, namely through the spray nozzles.
  • the spray nozzles are connected, for example, to a distributor located in the high-pressure line.
  • the pressure of the liquid substance in the humidification system is built up to a predetermined value by a pump such as a gear pump or a piston pump and is kept at this value.
  • a pump such as a gear pump or a piston pump
  • the spray pattern of each individual spray nozzle is therefore always the same during its opening hours, regardless of the throughput of the liquid substance to be sprayed.
  • the spray pattern is the same from the beginning to the end of each opening interval, regardless of how long the individual opening times of the spray nozzles or pulse times of the supply are.
  • the system shown in Fig. 1 is used for gluing chip material, for example with glue resin based on isocyanate.
  • the chip material is continuously fed into a closed cylindrical container 31 of a gluing machine 1 via a belt scale 2.
  • the container 31 contains a rotatably mounted agitator 32 which circulates the input chip material and also transports it from an inlet 3 at one end of the container 31 to an outlet 4 at the opposite end of the container.
  • the container 31 of the gluing machine 1 is provided with spray nozzles 5, which are attached to the cylindrical wall 33 of the container of the gluing machine 1 and open into the container 31.
  • a feed line 6 is connected for liquid glue which sees under high pressure. 1 shows three spray nozzles 5, but the gluing machine 1 is generally equipped with more spray nozzles, for example with a total of twelve spray nozzles.
  • Each feed line 6 contains, for example, a manually operated gate valve 7 and is connected to a common distributor 8 provided for all spray nozzles 5.
  • the distributor 8 is located in a line 9, for example a hose line, through which liquid glue under high pressure is brought in and is circulated in the process.
  • the belt scale 2 uses a measuring section 39 and a transmitter 40 to supply control signals to an electronic control unit 41 which is used to control the spray nozzles 5 and is connected to the latter via an electronic line 42 or individual lines 42a, 42b or 42c.
  • the transmitter 40 is connected to the control unit 41 via an electrical line 43.
  • the container 31 of the gluing machine 1 is cylindrical and stands on feet 44.
  • a shaft 45 of the agitator 32 is rotatably mounted, on the circumferential and length of which helically distributed agitator tools 46 are attached, which extend up to the cylindrical wall 33 of the container 31.
  • the shaft 45 is driven by a motor 47 (FIG. 1) in the direction of an arrow 48 at a sufficiently high speed, the pourable material in the container 31 forms a material ring 49 which runs along the wall 33 of the container 31 on a helical path from Inlet 3 migrates to outlet 4.
  • Fig. 2 it can also be seen that the spray nozzles 5 project eccentrically into the container 31 and open into the material ring 49, so that the glue supplied through the individual spray nozzles 5 is sprayed into the material ring 49.
  • a loosened zone 51 forms in the material ring 49 during the spray pulse times, in which the solid particles of the material ring with the fine droplets of glue, into which the glue brought in by the spray nozzles 5 has been divided, are intensively formed and be mixed uniformly.
  • the zone 51 can be identified by a bulge 52 on the inside 53 of the material ring 49.
  • the direction of rotation of the shaft 45 is selected so that stirring tools 46 do not counteract the direction of spray of the spray nozzles 5 and accordingly do not compress the loosened zones 51.
  • a piston 23 is attached, which is slidably seated in an actuating cylinder 24.
  • a compressed air line 25 which contains a shut-off valve 26, opens into the front end of the actuating cylinder 24.
  • This shut-off valve 26 is connected to the control unit 41, which opens the shut-off valve 26 as soon as the spray nozzle 5 is to spray glue into the container 31.
  • the piston 23 is then displaced by the compressed air introduced into the pressure chamber 28, as seen to the left in FIG. 3, as a result of which the pointed end 16 of the piston rod 15 is lifted from the nozzle opening 17 and, accordingly, the high-pressure glue from the nozzle opening 17 can leak.
  • shut-off valve 26 closes, the pressure chamber 28 is ventilated via the closed shut-off valve, so that the return spring 20 pushes the piston rod 15 back to the nozzle opening 17, whereby this is closed and no more glue can escape.
  • the control unit 41 operates electronically at a predetermined frequency, but the pulse lengths of the opening times of the shut-off valve 26 can be changed within the predetermined frequency according to control signals supplied by the belt scale 2, as shown in FIG. 3.
  • the length of the pulse times 29, during which glue is sprayed, and the length of the pause times 30, during which the spray nozzles 5 are closed, are variable at a constant frequency.
  • a pause time 30 is provided between the pulse times 29.
  • the pressure available for spraying the glue is practically the same during all pulse times 29, regardless of how long the individual pulse times are.
  • a piston pump is used to generate pressure, the delivery pressure of the glue can be kept practically constant.
  • other pumps can be used that deliver a substantially equal working pressure.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Nozzles (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Disintegrating Or Milling (AREA)
  • Paper (AREA)
EP84111857A 1983-10-08 1984-10-04 Procédé et dispositif pour mouiller des matières solides versables Expired EP0137450B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84111857T ATE31394T1 (de) 1983-10-08 1984-10-04 Verfahren und vorrichtung zum befeuchten schuettfaehiger feststoffe.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3336665 1983-10-08
DE19833336665 DE3336665A1 (de) 1983-10-08 1983-10-08 Verfahren zum befeuchten schuettfaehiger feststoffe und vorrichtung zum durchfuehren dieses verfahrens

Publications (2)

Publication Number Publication Date
EP0137450A1 true EP0137450A1 (fr) 1985-04-17
EP0137450B1 EP0137450B1 (fr) 1987-12-16

Family

ID=6211353

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84111857A Expired EP0137450B1 (fr) 1983-10-08 1984-10-04 Procédé et dispositif pour mouiller des matières solides versables

Country Status (5)

Country Link
US (1) US4670302A (fr)
EP (1) EP0137450B1 (fr)
AT (1) ATE31394T1 (fr)
CA (1) CA1249951A (fr)
DE (2) DE3336665A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6551401B1 (en) 2000-10-19 2003-04-22 Becker-Underwood, Inc. Machine for coloring landscaping material
WO2005035213A1 (fr) * 2003-09-12 2005-04-21 Kronospan Technical Company Limited Encollage haute pression dans un melangeur de fibres
DE102006058625B3 (de) * 2006-12-13 2008-06-05 Siempelkamp Maschinen- Und Anlagenbau Gmbh & Co. Kg Anlage zum Beleimen von Fasern für die Herstellung von Faserplatten
CN107138350A (zh) * 2017-06-29 2017-09-08 天津长城万达罐头有限公司 一种鱼罐头上盖划线防锈胶涂抹机
DE102019110188A1 (de) * 2019-04-17 2020-10-22 Siempelkamp Maschinen- Und Anlagenbau Gmbh Mehrstoffdüse, insbesondere Zweistoffdüse

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1796280A1 (de) * 1967-07-24 1972-11-09 Mcmillan Bloedel Ltd Verfahren und Vorrichtung zum Verspruehen von Fluessigkeiten
DE2523636A1 (de) * 1975-05-28 1976-12-16 Loedige Fritz Verfahren zum kontinuierlichen beleimen von lignozellulosehaltigen teilchen und vorrichtung zur durchfuehrung des verfahrens

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2428588C2 (de) * 1974-06-14 1985-10-17 Fritz Lödige Vorrichtung zum Beleimen von Spänen
DE3016061A1 (de) * 1980-04-25 1981-10-29 Siemens AG, 1000 Berlin und 8000 München Anordnung zum herstellen von flachen koerpern aus kunststoff
DE3143895C2 (de) * 1981-11-05 1985-01-17 Triangel Spanplatten KG, 3177 Sassenburg Verfahren und Vorrichtung zum Beleimen von teilchenförmigem Gut in Form von Spänen, Fasern o.dgl.
US4516524A (en) * 1983-02-16 1985-05-14 The Upjohn Company Apparatus for coating particulate material

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1796280A1 (de) * 1967-07-24 1972-11-09 Mcmillan Bloedel Ltd Verfahren und Vorrichtung zum Verspruehen von Fluessigkeiten
DE2523636A1 (de) * 1975-05-28 1976-12-16 Loedige Fritz Verfahren zum kontinuierlichen beleimen von lignozellulosehaltigen teilchen und vorrichtung zur durchfuehrung des verfahrens

Also Published As

Publication number Publication date
ATE31394T1 (de) 1988-01-15
DE3468092D1 (en) 1988-01-28
CA1249951A (fr) 1989-02-14
US4670302A (en) 1987-06-02
DE3336665A1 (de) 1985-04-25
EP0137450B1 (fr) 1987-12-16

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