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WO1999010177A1 - Dispositif de pulverisation de poudre - Google Patents

Dispositif de pulverisation de poudre Download PDF

Info

Publication number
WO1999010177A1
WO1999010177A1 PCT/EP1998/005265 EP9805265W WO9910177A1 WO 1999010177 A1 WO1999010177 A1 WO 1999010177A1 EP 9805265 W EP9805265 W EP 9805265W WO 9910177 A1 WO9910177 A1 WO 9910177A1
Authority
WO
WIPO (PCT)
Prior art keywords
powder
container
powder container
air
supply
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.)
Ceased
Application number
PCT/EP1998/005265
Other languages
German (de)
English (en)
Inventor
Berndt HÖRNER
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.)
MEDIPRINT APPARATEBAU GmbH
Original Assignee
MEDIPRINT APPARATEBAU 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 MEDIPRINT APPARATEBAU GmbH filed Critical MEDIPRINT APPARATEBAU GmbH
Publication of WO1999010177A1 publication Critical patent/WO1999010177A1/fr
Priority to US09/507,069 priority Critical patent/US6338440B1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
    • B41F23/06—Powdering devices, e.g. for preventing set-off

Definitions

  • the present invention relates to a method for supplying powdery substances to a dispensing device and, in particular, for supplying powdery substances to a dispensing device which applies this powdery substance to a flat product, such as a paper template, and a device for carrying out the method.
  • the printed products are still simply called sheets, this is not meant to be a limitation and includes all types of printable products and objects.
  • the printed sheet is conveyed onto a stack at a relatively high speed. At speeds that are 2 to 3 sheets per second and higher, there is a risk that the ink will not dry completely before the next sheet is fed onto the stack. In this case, part of the ink will stick to the back of the next sheet, rendering the products unusable. To avoid this, the printed areas are dusted with powder using a powder dusting device. This powder prevents the successive sheets from sticking together.
  • the powder must be applied with high precision. If too little powder is applied, the desired effect is not achieved and the printed products become unusable.
  • the operators of such printing machines expect that the operation can take place automatically and largely without control over several hours.
  • the powder supply device must therefore be designed so that it works reliably and without interference.
  • Powder atomizers are typical additional devices for printing machines.
  • the price of such accessories must be in an acceptable relation to the final price of the machine for the customer, so that the financial framework available for this, especially with cheap printing machines, is very limited.
  • the present invention is therefore based on the object of providing a method and a device for supplying powder to a powder dispensing device which operates reliably and without problems over a longer period of time and which is nevertheless inexpensive to produce.
  • the device according to the invention is the subject of claim 3. Preferred developments of the invention are the subject of the dependent claims.
  • the method according to the invention and the device according to the invention are designed in such a way that a powder container is provided which is connected to a vacuum device.
  • a separating device is arranged inside the powder container, by means of which part of the powder from the powder container is separated from the remaining amount of powder located there.
  • An air outlet device is arranged in such a way that it supplies the separated amount of powder with air such that the powder is whirled up by the air flowing out.
  • the vacuum device generates vacuum which is effective within the powder container. Due to this negative pressure, the air is sucked in with the whirled up powder and fed to the dispensing device via suitable lines etc.
  • a large powder supply requires a correspondingly large storage container. Since the amount of powder changes during operation within the powder container, the flow conditions also change, as a result of which the amount of powder whirled up and thus the concentration of the powder in the extracted air flow changes. In contrast, the separation of a powder quantity from the total quantity has the effect that the air flow acts only on a smaller part of the powder quantity and that the quantity whirled up is no longer dependent, or only to a small extent, on the filling quantity of the powder in the powder container.
  • the powder container is arranged essentially vertically, the air suction device then preferably being provided above the container.
  • the separating device preferably forms a chamber which is at least partially open in the case of a vertical powder container upwards and downwards.
  • the powder container is preferably designed to be rotationally symmetrical, the axis of rotation being essentially vertical, and the chamber is then preferably also designed such that its axis running in the longitudinal direction coincides with this axis of rotation.
  • the chamber is preferably also designed to be rotationally symmetrical, in which case the two axes of rotational symmetry of the container and the chamber coincide.
  • the chamber is preferably cyclone or funnel-like or conical, i.e. that is, the extent of the chamber in the cross-sectional direction, i. H. seen horizontally, decreases towards the bottom.
  • the air supply device is preferably directed with respect to the separating device or the wall of the chamber forming the same in such a way that the air flow first hits the wall of the chamber before it is then deflected by the latter onto the powder.
  • the device according to the invention also has a refill device.
  • the powder container has to be removed to refill, filled with powder and put back on.
  • the relevant machine must be shut down during this time.
  • a storage container is provided above the powder container and is connected to the powder container via a corresponding locking device, preferably a closing valve. By opening the valve, powder can be refilled from the storage container into the powder container, the operation of the machine not having to be interrupted.
  • the medium to be conveyed is a powder and that the medium is air. It is pointed out that the invention can also be carried out with media to be conveyed, which are usually not referred to as powder, provided that their behavior in a flowing medium is similar to the behavior of the powder in question.
  • air does not have to be used as the transport medium; depending on requirements, another gas can also be used, for example nitrogen, helium and the like.
  • the invention is particularly preferably carried out using powder which is suitable for dusting freshly printed products, such as, for. B. calcium carbonate and preferably with grain sizes between 5 and 100 microns, particularly preferably between 15 and 50 microns.
  • FIG. 1 shows the basic structure of a powder dusting device for printing machines in a perspective view, with individual components being shown separately from one another;
  • FIG. 2 shows a feed device for a pollination device according to FIG. 1 in a sketchy illustration
  • Fig. 3 is also a sketchy representation of a feed container according to FIG. 2 with a refill container placed thereon.
  • the reference symbol I overall designates a blower device, reference symbol II a device for feeding powder and III a device for applying powder to printed matter.
  • the device for feeding the powder consists of a housing 1 to which the powder container 2 is attached.
  • Air is supplied to the housing via a blower 3 by means of a hose 4. Part of the air is fed into the powder glass via a magnetic valve 6, as a result of which the powder is whirled up, as will be discussed in detail later.
  • Venturi nozzle (not shown in FIG. 1), which creates a negative pressure. This vacuum draws in the powder-air mixture created in the powder container and leads it to the actual pollination device 8.
  • the supply to the pollination device 8 takes place via hoses 9, which are connected via the housing 1 to the hose 4 and the powder container.
  • the amount of powder to be applied is regulated by controller 12.
  • Figure 2 shows the actual feed device for the powder.
  • the powder glass 2 is connected to the bottom 21 of the housing via a bayonet or screw closure via a seal 20.
  • An air supply bore 23 is connected to the hose 4 on the one hand and to a channel 25 guided through the floor on the other hand.
  • a cross-sectional constriction 26 is provided in this channel, which acts as a Venturi nozzle.
  • a substantially vertical channel 28 which is in flow connection with the powder glass.
  • a separating device 32 is arranged, which, for. B. is made of metal.
  • the separating device 32 is designed to be rotationally symmetrical with respect to a rotational axis 34, which also represents the rotational symmetry axis of the powder container 2.
  • the individual cross section of the separating device like the individual cross sections of the powder container, are circular.
  • the diameter of the separating device is approximately 2/3 of the diameter of the powder container in the upper region and tapers downwards.
  • the angle 35 through which the wall of the separating device is inclined with respect to the vertical is in the range of preferably 2 to 20 °, an angle range between 5 and 10 ° being particularly preferred.
  • the length of the separating device is preferably such that it is between 60 and 90% of the length of the powder container, measured in the direction of the axis of rotation, particularly preferably in the range between 70 and 90 °.
  • the wall of the separating device is curved inwards in such a way that a bore 38 remains through which the separating device is connected to the interior of the powder container 2.
  • the front ends 39 of the wall of the separating device, which surround the bore 38, are preferably rounded.
  • An air inlet opening 40 which is connected to the air supply hose 4 via the solenoid valve shown, projects into the interior of the separating device, the air supply device 40 being curved to the wall of the separating device and the front opening 41 of the air supply device 40 being designed such that the escaping air is blown against the wall.
  • the powder container 2 which is preferably made of transparent glass, is removed from the housing 21 and filled with powder 42. Then it is put back on, resulting in a fill level of the powder 44.
  • Part of the powder is already pressed into the separating device when the powder container is being applied and forms a powder supply 45 there.
  • This powder supply 45 has a fill level 46.
  • the whirled up powder is drawn into the channel 28 by the negative pressure, as shown by the arrows 49.
  • the powder is entrained by the air stream that enters the nozzle 23 and fed to the pollinator via the hoses. Due to the powder thus removed and conveyed from the separating device, the fill level 46 of the powder in the separating device is reduced. This reduction in the level is not immediately compensated for. Only when a certain difference between the fill level 44 of the powder supply and the fill level 46 has been reached does powder flow along the arrows 53 from the powder container 2 into the interior of the separating device.
  • the inflow of the amount of powder can be influenced in such a way that the level of the powder within the separating device changes only within certain limits .
  • the reduced volume of the interior of the separating device compared to the total volume of this powder container already means that the amount of powder whirled up by the air stream essentially depends on the level of the powder in the separating device. direction is independent. It is thereby achieved that the amount of powder supplied to the dusting device per unit of time is essentially constant, ie that on the one hand the air flow, ie the air volume entering the powder hoses per unit of time is essentially constant and that the volume or weight fraction of the powder in this air flow is also essentially constant. As a result, the amount of powder applied to the printed sheets per unit of time is essentially constant, and this constancy can also be maintained over several hours.
  • the constancy of the amount of powder supplied is further improved by the fact that the decrease in the powder supply in the powder container only influences the fill level of the powder in the separating device to a lesser extent.
  • FIG. 1 Another embodiment of the invention is shown schematically in FIG. 1
  • FIG 3 shows the powder container 2 with the separating device 32 in the lower region.
  • a container 60 Arranged above the powder container 2 is a container 60 which tapers downward in a region 61 in such a way that the width essentially corresponds to the difference between the radii of the powder container and the separating device.
  • valve device 62 which is not shown in the drawing and which closes off the container, is provided.
  • the interior of the container 60 is connected to this flow channel 64 via a flow channel 64.
  • a residual fill level 66 of the powder is shown in this storage container.
  • the valve device 62 is usually closed, so that the interior of the powder container 2 and the interior of the storage container 60 are not connected to one another. The build-up of a negative pressure in the powder container 2 or in the separating device 32 is therefore not influenced by the storage container 61.
  • valve 62 When an operator recognizes that the amount of powder in the powder container 2 is below a predetermined amount, he opens the valve 62, whereby a flow connection between the interior of the container 60 and the interior of the powder container 2 is created. As a result of this flow connection, so much powder flows into the powder container 2 until a predetermined filling level is reached and the operator closes the valve device 62.
  • the aforementioned activity can also be automated, for which purpose at least one fill level sensor is then provided in the powder container, which detects the fill level of the powder and outputs a related electrical signal to a control device (not shown).
  • This control device then causes the valve 62, which in this case is actuated electrically or pneumatically, to be opened until the fill level in the powder container 2 has reached the predetermined maximum amount.
  • This maximum quantity is also preferably detected by a sensor and a corresponding signal is sent to the control device.
  • the interior of the powder container 2 is not enlarged by the storage container, so that the pressure ratios, and in particular the negative pressure, are not influenced thereby.
  • the powder container must be removed when refilling the powder and the machine must be stopped.
  • this storage container only the solenoid valve 62 is opened. The pressure conditions in the powder container and in particular in the separating device are not changed significantly during the outflow of the powder in the powder container 2, so that the operation can be continued.
  • valve device 62 When the valve device 62 is closed, powder can be poured into the storage container 60 without the machine having to be stopped.
  • the storage container 60 By connecting the storage container 60, it is thus possible to operate the pollination device continuously. Since the powder container is mostly arranged in the lower area of the machine due to the design of the printing presses, it is usually difficult for the operator to remove and fill the container. By using such a storage container, the powder can be filled in easily from above.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Air Transport Of Granular Materials (AREA)
  • Nozzles (AREA)

Abstract

L'invention concerne un procédé et un dispositif d'alimentation en poudre d'un dispositif d'épandage. Ce dispositif d'alimentation comprend un dispositif de production de pression négative (26), un dispositif de production de surpression, un réservoir de poudre (2) destiné à contenir la réserve de poudre et un dispositif de séparation (32) placé à l'intérieur du réservoir (2) et destiné à séparer une partie de la réserve de poudre du reste de la réserve de poudre contenue dans le réservoir (2). Le dispositif de production de surpression, raccordé à un dispositif d'amenée d'air (40), envoie l'air sur cette partie de poudre séparée (45) provoquant son tourbillonnement. Le dispositif de production de pression négative (26) est raccordé au réservoir de poudre (2) de telle façon que, sous l'effet de la pression négative, la poudre tourbillonnante est expulsée du réservoir (2) et acheminée jusqu'au dispositif d'épandage.
PCT/EP1998/005265 1997-08-21 1998-08-19 Dispositif de pulverisation de poudre Ceased WO1999010177A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US09/507,069 US6338440B1 (en) 1998-08-19 2000-02-18 Procedure for feeding of powder-like substances to a discharging means and device for performing the procedure

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19736448.9 1997-08-21
DE1997136448 DE19736448B4 (de) 1997-08-21 1997-08-21 Vorrichtung und Verfahren zur Zufuhr von Puder

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US09/507,069 Continuation US6338440B1 (en) 1998-08-19 2000-02-18 Procedure for feeding of powder-like substances to a discharging means and device for performing the procedure

Publications (1)

Publication Number Publication Date
WO1999010177A1 true WO1999010177A1 (fr) 1999-03-04

Family

ID=7839759

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1998/005265 Ceased WO1999010177A1 (fr) 1997-08-21 1998-08-19 Dispositif de pulverisation de poudre

Country Status (2)

Country Link
DE (1) DE19736448B4 (fr)
WO (1) WO1999010177A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000009335A1 (fr) * 1998-08-10 2000-02-24 Weitmann & Konrad Gmbh & Co. Kg Dispositif de poudrage a apport de poudre constant
WO2020228227A1 (fr) * 2019-05-13 2020-11-19 徐工集团工程机械股份有限公司 Système de pulvérisation de poudre sèche et camion d'incendie

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29717645U1 (de) * 1997-10-03 1998-01-08 Weitmann & Konrad GmbH & Co KG, 70771 Leinfelden-Echterdingen Vorrichtung zum Bestäuben bewegter Druckbogen

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0528613A2 (fr) * 1991-08-09 1993-02-24 Oxy-Dry Corporation Pulvérisateur de poudre avec un système d'alimentation en poudre pneumatique
US5615830A (en) * 1993-12-17 1997-04-01 Nordson Corporation Apparatus and method for supply and transport of powder particles

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE939086C (de) * 1951-06-14 1956-02-16 Albin Platsch Vorrichtung zum Trockenbestaeuben von Druckbogen
DE1920722U (de) * 1964-02-20 1965-08-05 Karl Otte Maschinenfabrik Druckbestaeuber zum bestaeuben frisch bedruckter bogen.
DE1611317A1 (de) * 1967-07-22 1971-01-21 Polygraph Leipzig Puderdruckbestaeuber
CS204450B1 (en) * 1978-12-27 1981-04-30 Vaclav Kaspar Dusting device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0528613A2 (fr) * 1991-08-09 1993-02-24 Oxy-Dry Corporation Pulvérisateur de poudre avec un système d'alimentation en poudre pneumatique
US5615830A (en) * 1993-12-17 1997-04-01 Nordson Corporation Apparatus and method for supply and transport of powder particles

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000009335A1 (fr) * 1998-08-10 2000-02-24 Weitmann & Konrad Gmbh & Co. Kg Dispositif de poudrage a apport de poudre constant
US6299021B1 (en) 1998-08-10 2001-10-09 Weitmann & Konrad Gmbh & Co. Powder device with a constant supply of powder
WO2020228227A1 (fr) * 2019-05-13 2020-11-19 徐工集团工程机械股份有限公司 Système de pulvérisation de poudre sèche et camion d'incendie

Also Published As

Publication number Publication date
DE19736448A1 (de) 1999-02-25
DE19736448B4 (de) 2010-06-02

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