EP0519363A1 - Procédé et dispositif pour l'application de produits visqueux en forme de bande - Google Patents

Procédé et dispositif pour l'application de produits visqueux en forme de bande Download PDF

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Publication number
EP0519363A1
EP0519363A1 EP92110009A EP92110009A EP0519363A1 EP 0519363 A1 EP0519363 A1 EP 0519363A1 EP 92110009 A EP92110009 A EP 92110009A EP 92110009 A EP92110009 A EP 92110009A EP 0519363 A1 EP0519363 A1 EP 0519363A1
Authority
EP
European Patent Office
Prior art keywords
gas
application
nozzle
strand
guide channels
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
EP92110009A
Other languages
German (de)
English (en)
Other versions
EP0519363B1 (fr
Inventor
Ralf Ludwig
Robert Murray
Wolfgang Rosteck
Heinz Wessel
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.)
Graco Verfahrenstechnik GmbH
Boellhoff Verbindungstechnik GmbH
Ford Werke GmbH
Original Assignee
Graco Verfahrenstechnik GmbH
Boellhoff Verbindungstechnik GmbH
Ford Werke 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 Graco Verfahrenstechnik GmbH, Boellhoff Verbindungstechnik GmbH, Ford Werke GmbH filed Critical Graco Verfahrenstechnik GmbH
Publication of EP0519363A1 publication Critical patent/EP0519363A1/fr
Application granted granted Critical
Publication of EP0519363B1 publication Critical patent/EP0519363B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/04—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge
    • B05B7/0416—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid
    • B05B7/0441—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid with one inner conduit of liquid surrounded by an external conduit of gas upstream the mixing chamber
    • B05B7/0475—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid with one inner conduit of liquid surrounded by an external conduit of gas upstream the mixing chamber with means for deflecting the peripheral gas flow towards the central liquid flow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/26—Processes for applying liquids or other fluent materials performed by applying the liquid or other fluent material from an outlet device in contact with, or almost in contact with, the surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
    • B05D3/0406—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases the gas being air

Definitions

  • the invention relates to a method for the strip-shaped application of viscous material to the surface of a workpiece, whereby the application device and the workpiece are moved relative to one another, the material exits under pressure as a thread-like strand from a material nozzle and the strand circumference is acted upon by compressed gas, which is the point of application is supplied with axial and radial flow component, as well as on a device for the strip-shaped application of viscous material to the surface of a workpiece, with a central material nozzle connected to a material connection and with a gas supply system, which has a distribution annulus connected to a gas connection and the die Has outlet channel surrounding material nozzle with walls tapering in the axial flow direction towards the center.
  • a viscous material is understood to mean that which, under operating conditions, is not atomized finely by the compressed gas, but rather maintains the strand shape at least in sections during application. In general, they are materials that have a viscosity of more than 100 cSt. Typical examples of this are applying strips of adhesive or sealing material. To set a desired viscosity, the material can be heated or provided with a solvent additive.
  • a corresponding configuration of the material nozzle and gas supply system ensures that the thread-like material strand is given a swirl movement, so that it is deposited on the surface in a plurality of adjacent arcs.
  • the air used as gas is fed through an approximately axially parallel bore to a distributor annulus, from which the gas outlet duct immediately branches off.
  • the swirl movement can be achieved in various ways, for example in that the bore serving for the supply of gas or the supply of material is inclined with respect to the longitudinal axis or that the material nozzle and the outlet channel for the gas are arranged asymmetrically to one another.
  • the strand is deposited in arcs of the same diameter.
  • the edges of the strip have a greater height than the central region. If the strip is brought into contact with a second surface, the contact surface is limited to the edge regions of the strip, which is undesirable both for gluing and for sealing.
  • the amount of material that can be applied per unit of time is very limited. This is particularly noticeable with larger strip thicknesses, such as are required for a seal. If you increase the application quantity above the specified limit value, the streak area is contaminated by material particles.
  • the object of the invention is to improve the strip application, in particular with regard to the strip cross section and / or the application speed.
  • this object is achieved in that the pressurized gas is fed to the application point in such a way that a tangential flow component is suppressed.
  • the compressed gas is aligned before it hits the strand so that the tangential flow component responsible for the swirl essentially disappears.
  • the thread-like strand is therefore no longer loaded by centrifugal forces and is constantly deposited in circular arcs of the same size, but rather the deflection from the central position occurs due to the instabilities in the compressed gas supplied. Circular movements can also occur here.
  • the circle diameter is not always the same as the strip width, there is a material overlay, which ultimately leads to a strip with a uniform thickness. The entire strip surface is therefore available as a contact surface for the respective application.
  • the thread-like strand was constricted both by the compressed air acting on it and by the twisting of the strand around its own axis. If one increased the material supply and necessarily also the gas supply, this resulted in a drill dilution so strong that the strand broke off. The torn off strand parts were thrown outwards by the centrifugal force, where they interfered as impurities.
  • material pressure and gas pressure can be very significant increase.
  • the limit at which strand sections tear off is much higher due to the lack of swirl.
  • the application speed can therefore be increased significantly without fear of pollution of the surroundings.
  • the method is therefore particularly suitable for the application of thick strips, but also for the faster application of thin strips.
  • a preferred solution provides that the compressed gas is divided into a plurality of sub-streams after an annular distribution, each of which is directed and brought together again only shortly before the application.
  • the partial streams that are directed for themselves maintain their direction until they are applied.
  • three partial flows fed with a uniform circumferential spacing are sufficient to keep the strand in a safe central position when it is loaded.
  • the gas-encased strand is expediently constricted shortly after being loaded.
  • the compressed air spreads out as a cone behind the constriction point. It forms a shell that prevents individual sections of the strand from being flung away.
  • the constriction itself is the hinge point around which the strand performs its initial wobble or twist.
  • the compressed gas can be supplied with a pulsating pressure. This can be used to influence the distribution of the material in the strip.
  • the solution according to the invention is that guide channels which are uniformly distributed in the circumferential direction are arranged between the distributor annular space and the outlet channel and give the partial streams passing through a direction free of tangential components.
  • the partial flows emerging from the guide channels maintain their direction free of tangential components up to the point of application.
  • the guide channels can run parallel to the material nozzle axis. This results in a very handy construction, because the distance between the material nozzle axis and guide channels can be kept small.
  • a material tube carrying the material nozzle is enclosed by an outer tube and that the guide channels are designed as axial grooves on the cylindrical separating surface of the two tubes. It is only necessary to mill the axial grooves in one tube and to cover them with the other tube.
  • the distributor annulus is formed by a peripheral recess on the cylindrical separating surface of the two pipes.
  • the axial grooves are provided on the material tube and the peripheral recess on the outer tube.
  • the length of the guide channels should be at least 3 times the diameter on which they are arranged. This leads to a sufficient alignment of the partial gas flows.
  • At least one gas connection connects laterally and in particular radially to the distributor annulus.
  • the distributor annulus serves to calm the radially supplied compressed gas. Any tangential component is suppressed by the subsequent guide channels.
  • annular cross section of the outlet channel is approximately constant over its length. The gas then maintains its flow rate.
  • the outlet channel opens out particularly advantageously between the material nozzle and an outlet nozzle which has a larger cross section than the material nozzle.
  • This outlet nozzle serves to constrict the gas-coated strand and gives the advantages mentioned above.
  • the 1 to 3 has a material tube 1 with a material channel 2, which connects a material connection 3 with a material nozzle 4.
  • the outer circumference of the material tube 1 has six axial grooves 5 arranged at the same circumferential spacing, which are covered by the inner circumference of a pushed-on outer tube 6 and therefore form guide channels 7 running parallel to the material nozzle axis.
  • a circumferential recess 8 is provided, which is provided with a radial compressed gas connection 9, via which compressed air is supplied, and is covered by the outside of the material tube 1 and therefore forms a distributor annulus 10.
  • the two tubes 1 and 6 are fastened to a connecting body 13 via threads 11 and 12, respectively.
  • a cap 14 is screwed onto the outer tube 6 by means of a thread 15. It has an outlet nozzle 16 which has a slightly larger diameter than the material nozzle 4. Between the cap 14 and the material tube 1 there is an outlet channel 17 for the compressed air. This outlet channel is delimited by two conical walls 18 and 19, one of which is formed on the end face of the material tube 1 and the other on the back of the cap 14.
  • viscous material is supplied via the material connection 3 and the material channel 2. It emerges as a thread-like strand from the material nozzle 4.
  • Compressed air is supplied via the compressed air connection 9, the distributor annulus 10 and the guide channels 7 parallel to the material nozzle axis 4.
  • Partial flows of compressed air are ultimately aligned axially parallel in these guide channels. They are deflected radially inwards in the outlet channel 17 and strike the periphery of the thread-like strand at an application point 20, the direction of application being practically free of a tangential flow component, based on the axis of the material nozzle 4. Insofar as the subdivision into partial flows in the circumferential direction causes certain irregularities in the loading, these are harmless because they load the line symmetrically.
  • the strand and the compressed gas enveloping it occur through the outlet nozzle 16.
  • the strand is constricted and thinned by the application and the narrowing. Outside the outlet nozzle 16, the compressed gas expands as a guide cone. As a result of the instabilities that are always present, the strand wobbles and circles within the guide cone until it strikes the surface (not shown).
  • the air pressure may even be chosen so high that the strand tears into sections because these remain within the guide cone of the compressed air.
  • a large range of material pressures for example from 2 to 60 bar, and a large range of gas pressures, for example from 0.2 to 5 bar, can therefore be used. It is recommended to keep the gas pressure lower than the material pressure.
  • Fig. 4 shows the conditions for gas supply with a tangential component.
  • the material is deposited in the form of a narrow ring 21, which corresponds to the distribution 22.
  • the annular deposit is superimposed, which corresponds to a strip cross section 23. If one were to ensure that circular patterns 24 were deposited in accordance with the uniform distribution 25, the strip cross-section 26 would result.
  • the desired job lies between the two extremes.
  • the order pattern 27 has, for example, the distribution 28, according to which there is a slight order in the middle and a stronger order further out. In the optimal case, this leads to the uniform strip cross section 29 of FIG. 5 due to the integration effect of the movement component P. In any case, the shape of the cross section lies between the shapes of the extreme cross sections 23 and 26.
  • the outlet nozzle can be adjusted axially relative to the material nozzle 4. This changes the angle of the guide cone.
  • the application form is ensured over a larger area of the distance between the application device 1 and the surface to be coated. You can therefore choose the distance in any case so that contamination of the cap 14 is avoided by rebounding material.
  • the gas connection 9 can be arranged in the connection body 13.
  • the gas can also be supplied in a heated state.
EP92110009A 1991-06-21 1992-06-13 Procédé et dispositif pour l'application de produits visqueux en forme de bande Expired - Lifetime EP0519363B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4120881 1991-06-21
DE4120881A DE4120881C1 (fr) 1991-06-21 1991-06-21

Publications (2)

Publication Number Publication Date
EP0519363A1 true EP0519363A1 (fr) 1992-12-23
EP0519363B1 EP0519363B1 (fr) 1995-11-22

Family

ID=6434665

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92110009A Expired - Lifetime EP0519363B1 (fr) 1991-06-21 1992-06-13 Procédé et dispositif pour l'application de produits visqueux en forme de bande

Country Status (4)

Country Link
US (1) US5322564A (fr)
EP (1) EP0519363B1 (fr)
DE (2) DE4120881C1 (fr)
ES (1) ES2080379T3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101992159B (zh) * 2009-08-18 2012-10-24 和纶企业股份有限公司 二流体喷嘴
WO2019032417A1 (fr) * 2017-08-08 2019-02-14 Illinois Tool Works Inc. Buse de pâte d'étain, établi et appareil d'alimentation en pâte d'étain

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19500053C1 (de) 1995-01-03 1996-03-07 Int Gmbh Ingenieurbuero Fuer N Vorrichtung zum streifenförmigen Auftragen von viskosem Material
DE69724400T2 (de) 1996-12-02 2004-03-11 Graco Inc., Minneapolis Vorrichtung mit kontrolliertem Abgabemuster
US6056213A (en) * 1998-01-30 2000-05-02 3M Innovative Properties Company Modular system for atomizing a liquid
CA2238301C (fr) * 1998-05-22 2006-01-24 Vanberg, Gerald Appareil pour generer de la fumee
US6082637A (en) * 1998-09-29 2000-07-04 INT Gesellschaft mit beschrankter Haftung Ingenierburo fur Neue Technologien, Anlagenbau Verfahrenstechnik, ADFOSY Nozzle device
US6170760B1 (en) 1999-01-25 2001-01-09 Precision Valve & Automation, Inc. Compact spray valve
US6892963B1 (en) * 1999-09-10 2005-05-17 Usbi Co Portable convergent spray gun capable of being hand-held
US20050001869A1 (en) * 2003-05-23 2005-01-06 Nordson Corporation Viscous material noncontact jetting system
US7028867B2 (en) * 2003-10-30 2006-04-18 Nordson Corporation Conformal coating applicator and method
US20060029724A1 (en) * 2004-08-06 2006-02-09 Nordson Corporation System for jetting phosphor for optical displays
US20070145164A1 (en) * 2005-12-22 2007-06-28 Nordson Corporation Jetting dispenser with multiple jetting nozzle outlets
DE102014010843B4 (de) * 2014-07-24 2020-12-03 Technische Universität Braunschweig Dosierdüse und Verfahren zum dosierten Auftragen hochviskoser Medien
US9573147B1 (en) * 2016-04-15 2017-02-21 Kaer Biotherapeutics Corporation Aerosolizing nozzle and method of operating such aerosolizing nozzle

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2168266A (en) * 1984-12-04 1986-06-18 Perard Torque Tension Ltd Dust suppression method & apparatus
EP0293065A2 (fr) 1987-05-26 1988-11-30 Acumeter Laboratories Inc. Méthode et appareil pour déposer des fluides visqueux sur une surface
EP0362548A2 (fr) * 1988-10-05 1990-04-11 Nordson Corporation Appareil de pulvérisation d'adhésifs fondant à chaud
US4995333A (en) 1989-09-15 1991-02-26 Kimberly-Clark Corporation Sprayed adhesive system for applying a continuous filament of theroplastic material and imparting a swirling motion thereto
DE3939992A1 (de) 1989-12-02 1991-06-06 Juergen Hiessl Spruehkopf zum automatischen auftragen und verteilen von fluessigkeiten, insbesondere fuer feinsten mengendurchsatz und nebelarmen, zuverlaessigen betrieb

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE293065C (fr) *
US1756744A (en) * 1928-03-16 1930-04-29 Union Steel Prod Co Coating machine
US2715385A (en) * 1951-09-25 1955-08-16 Int Smelting & Refining Co Apparatus for applying mold wash to molds
US3062455A (en) * 1959-11-27 1962-11-06 Gpe Controls Inc Jet pipe nozzle arrangement
US3049439A (en) * 1960-04-11 1962-08-14 Wald Ind Inc Internal mix catalyst type spray gun and process employing same
US4987854A (en) * 1988-12-12 1991-01-29 Nordson Corporation Apparatus for gas-aided dispensing of liquid materials

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2168266A (en) * 1984-12-04 1986-06-18 Perard Torque Tension Ltd Dust suppression method & apparatus
EP0293065A2 (fr) 1987-05-26 1988-11-30 Acumeter Laboratories Inc. Méthode et appareil pour déposer des fluides visqueux sur une surface
EP0362548A2 (fr) * 1988-10-05 1990-04-11 Nordson Corporation Appareil de pulvérisation d'adhésifs fondant à chaud
US4995333A (en) 1989-09-15 1991-02-26 Kimberly-Clark Corporation Sprayed adhesive system for applying a continuous filament of theroplastic material and imparting a swirling motion thereto
DE3939992A1 (de) 1989-12-02 1991-06-06 Juergen Hiessl Spruehkopf zum automatischen auftragen und verteilen von fluessigkeiten, insbesondere fuer feinsten mengendurchsatz und nebelarmen, zuverlaessigen betrieb

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101992159B (zh) * 2009-08-18 2012-10-24 和纶企业股份有限公司 二流体喷嘴
WO2019032417A1 (fr) * 2017-08-08 2019-02-14 Illinois Tool Works Inc. Buse de pâte d'étain, établi et appareil d'alimentation en pâte d'étain

Also Published As

Publication number Publication date
DE4120881C1 (fr) 1993-03-11
US5322564A (en) 1994-06-21
EP0519363B1 (fr) 1995-11-22
DE59204401D1 (de) 1996-01-04
ES2080379T3 (es) 1996-02-01

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