EP0345666A2 - Tête de pulvérisation pour liquides - Google Patents

Tête de pulvérisation pour liquides Download PDF

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Publication number
EP0345666A2
EP0345666A2 EP89110046A EP89110046A EP0345666A2 EP 0345666 A2 EP0345666 A2 EP 0345666A2 EP 89110046 A EP89110046 A EP 89110046A EP 89110046 A EP89110046 A EP 89110046A EP 0345666 A2 EP0345666 A2 EP 0345666A2
Authority
EP
European Patent Office
Prior art keywords
spray head
head according
liquid medium
nozzle gap
shaped nozzle
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.)
Withdrawn
Application number
EP89110046A
Other languages
German (de)
English (en)
Other versions
EP0345666A3 (fr
Inventor
Grant Mcguffy
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.)
Nordson Corp
Original Assignee
Nordson Corp
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 Nordson Corp filed Critical Nordson Corp
Publication of EP0345666A2 publication Critical patent/EP0345666A2/fr
Publication of EP0345666A3 publication Critical patent/EP0345666A3/fr
Withdrawn legal-status Critical Current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
    • B05B7/025—Nozzles having elongated outlets, e.g. slots, for the material to be sprayed
    • 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
    • B05B7/0483—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 gas and liquid jets intersecting in the mixing chamber

Definitions

  • the invention relates to a spray head for spraying liquid media of the type specified in the preamble of claim 1.
  • liquid media is intended to cover all sprayable media, but in particular adhesives and lacquers which have to be sprayed on as a gas / medium mixture in many applications, for example for painting surfaces, but also for coating webs, such as, for example Textiles.
  • adhesives and lacquers which have to be sprayed on as a gas / medium mixture in many applications, for example for painting surfaces, but also for coating webs, such as, for example Textiles.
  • the spraying of thermoplastic, high-polymer materials that are used as hot melt adhesives is intended.
  • Spray heads of the type specified are known, for example, from DE-PS 35 43 469, DE-PS 29 24 174 and US Pat. No. 4,669,661.
  • At least one feed channel for the liquid medium, at least one feed channel for a gas stream and a common outlet opening for the mixture of liquid medium / gas are provided.
  • the outlet openings are each designed as round nozzles, the so-called "spray cone" and to create a circular application pattern.
  • the volume flows in the center of the cone are usually different than in the edge area; in addition, the individual spray cones generally have different volume flows; Therefore, a uniform, area-wide application, such as is required, for example, for coating substrates with adhesives, in particular hot melt adhesives, is not possible using this spray principle.
  • the invention is therefore based on the object of creating a spray head for spraying liquid media, in particular adhesives, such as hot melt adhesives, or lacquers of the type specified, in which the disadvantages mentioned above do not occur.
  • a spray head is to be proposed which delivers a completely uniform spray pattern over the entire width of the surface to be coated, as cannot be achieved with the spray heads customary hitherto.
  • the advantages achieved by the invention are based on the design of a spray head with a surface nozzle, which delivers a line or strip-shaped application with a very homogeneous spray density over the entire surface, so that completely uniform spray patterns can also be achieved.
  • the two materials i.e. the liquid medium and the gas
  • the two materials are each fed from their supply lines to an elongated intermediate chamber and thus expanded to the desired application width.
  • the still separated materials reach the common, slit-shaped nozzle gap via stowage chambers; the first contact between the two materials takes place at the end of the two stowage chambers at the entry surface of the nozzle gap, whereby according to a preferred embodiment the two streams meet at a relatively large angle and thereby mix intimately with one another.
  • Particularly good results are obtained with an angle of incidence of approximately 90 °.
  • the gas stream which strikes the stream from the liquid medium almost perpendicularly and leaves its storage chamber at high speed, conveys the liquid medium pneumatically and thereby mixes intimately with it, so that a very homogeneous mixture of liquid medium / gas leaves the slit-shaped nozzle gap and acts as a line. or strip-shaped application pattern is sprayed onto the web to be coated.
  • the device is designed in a modular construction and consists of two separate, interconnectable main components, namely the gas supply part and the supply part for the liquid medium provided with the usual valve.
  • the respective elongated intermediate chamber is formed in plate-shaped mouthpieces, the edges and surfaces of which form the storage spaces or the slot-shaped nozzle gap with one another or with the opposite surfaces of the main parts.
  • the two plate-shaped mouthpieces are displaceably mounted, so that the shape and size of the storage spaces and the slot-shaped nozzle gap can be varied and adapted with different requirements and properties of the materials to be processed.
  • the two main parts are heated and together by one heat Surround me insulation to ensure a uniform temperature, which is particularly important for the processing of hot melt adhesives.
  • the outer surfaces of the two mouthpieces in such a way that a flat surface results in the area of the outlet of the slot-shaped nozzle gap.
  • the outlet of the slot-shaped nozzle gap is provided with a tear-off edge, so that in this area the corresponding outer surfaces of the two mouthpieces should meet at an angle which is less than 90 ° and, according to a preferred embodiment, between 30 and 60 °, in particular between 40 and 50 °.
  • a surface of the storage space for the liquid medium is provided with a groove-like pattern at least shortly before the liquid medium strikes the gas stream and is marked as " Quasi slot "is formed. This results in a uniform distribution of the liquid medium over the entire width of the storage space, the liquid medium leaving the storage space in the form of individual “flow threads” and thereby being able to mix very well and homogeneously with the gas stream.
  • These grooves produced by milling according to a preferred embodiment should have a depth of 0.1 to 1.0 mm, in a preferred embodiment of 0.2 to 0.6 mm, in order to ensure the perfect passage of the liquid medium in connection with its even distribution to ensure over the entire length of the storage space and thus the slot-shaped nozzle gap.
  • No firm specifications can be made for the width of the grooves or millings and in particular for the width of the blocking area between two adjacent grooves, since these parameters also depend on the type of application pattern to be achieved. By designing this area appropriately, a kind of "mask effect" can be achieved, so that unusual spray patterns can also be realized, for example spray patterns in which coated areas alternate with uncoated areas over the entire length of the slot-shaped nozzle gap.
  • the slit-shaped nozzle gap has the same thickness over its entire length, so that the gas flow and the liquid medium entrained by it mix thoroughly in the slit-shaped nozzle gap, atomized at the tear-off edge of the nozzle gap, where there is only little adhesion, and sprayed onto the one to be coated Material web to be sprayed on.
  • the spray head shown in the figures is designed in a modular construction and has two main parts which are firmly connected to one another, in particular screwed together, namely a first part 12 for the supply of a hot melt adhesive and a second part 14 for the supply of the gas , especially air.
  • the top and the side surfaces of these two main parts 12, 14 are surrounded by a schematically indicated thermal insulation 16.
  • the part 12 for the supply of the hot-melt adhesive is provided with the usual bores 18 for heating elements, in particular resistance heating elements (not shown) and has a bore 20 which runs in the vertical direction from top to bottom and which at its lower end is in a region 21 merges with a reduced diameter, so that a shoulder-shaped shoulder is formed.
  • a valve needle 22 can be pushed back and forth, which is provided with a piston 24 at its upper end.
  • This piston 24 is either acted upon alternately on both sides with compressed air or only acted upon on one side with compressed air and adjusted in the other direction by a spring, so that the piston 24 and thus the valve needle 22 are moved back and forth accordingly.
  • adjusting mechanism 28 which is provided with manually adjustable actuating members 26 and with which the stroke of the valve needle 22 can be adjusted.
  • the valve needle 22 runs at its lower end into a tip 22a, the side surface of which comes into contact with the shoulder of the channel 20 and thereby closes the lower end 21 of the channel 20, so that no more hot melt adhesive can escape.
  • the liquefied and thus flowable hot melt adhesive is supplied to the channel 20 under pressure in the usual way, so that the hot melt adhesive can emerge down the channel 20 through the gap between the lower tip 22a and the shoulder when the valve needle 22 is raised, while lower position of the valve needle 22, the tip 22a rests on the shoulder and thus blocks the channel 20, so that the flow of the hot melt adhesive is not possible.
  • the part 14 for the supply of air is also heated and has a plurality of bores 30 which are connected to an air source (not shown) and open into a common outlet channel 32.
  • a plate-shaped element 34 hereinafter referred to as "mouthpiece" is screwed onto the underside of part 12 and has the shape shown in FIGS. 1 and 2, namely on its surface facing the underside of part 12 with a groove 36 which is rectangular in cross section is provided, which extends almost over the entire length of the first mouthpiece 34, as can be seen from Figure 3.
  • This groove 36 is somewhat wider than the lower, narrow end of the channel 20 in the part 12. As a result, the tip 22a of the valve needle 20 penetrating the groove 36 cannot hinder an adjustment of the first mouthpiece 34 in the direction of the double arrow 38 shown in FIG .
  • the first mouthpiece 34 can be moved in the direction of the double arrow 38.
  • the groove 36 which is aligned with the lower, narrow end of the bore 20, is adjoined by a beveled edge 42 which finally ends at the left, upper edge of the plate-shaped first mouthpiece 34 again at the level of the flat top of the first mouthpiece 34.
  • the gap thus formed which tapers to the left as shown in FIG. 2, between the oblique edge 42 and the underside of the part 12 serves as storage space 43 for the hot melt adhesive supplied via the narrow bore 20 and the groove 36.
  • the beveled surface 42 adjoining the groove 36 is provided with grooves 44, which extend from the groove 36 into the region of the edge 48 and the hot melt adhesive on its way from the groove Divide 36 to edge 48 into a large number of individual "threads".
  • These grooves 44 can, for example, have the shape shown in FIG. 5, namely triangular in cross section; the triangular grooves 44 are separated from one another by trapezoidal webs 46, the intermediate webs 46 and thus the blocking regions being somewhat wider than the grooves 44 in the embodiment shown, so that the ratio of blocking area / flow area is greater than 50%.
  • the respectively desired conditions can be set and certain application patterns, in particular with coating-free strips, can also be achieved.
  • Adjoining the edge 48 of the first mouthpiece 34 is a downwardly sloping, bevelled surface 50 which forms one side of the slot-shaped nozzle gap 51 and which slopes obliquely outwards at an angle of somewhat more than 90 ° to the underside of the part 12 and thus to the top of the first mouthpiece 34.
  • a short surface 52 which runs parallel to the top of the mouthpiece 34 and merges into the underside of the first mouthpiece 34 via a beveled intermediate piece 54.
  • the right-hand side of the part 14 for the air supply as shown in FIGS. 1 and 2 is provided with an elongated recess 56 which is rectangular in cross section and in which there is also a plate-shaped second mouthpiece 58.
  • This second mouthpiece 58 is thus clamped in the recess 56 between the two opposite surfaces of the parts 14 and 12 by tightening the fastening screws for the two parts 12, 14.
  • the second mouthpiece 58 can be moved in the direction of the double arrow 60 along the side wall of the part 12 upwards or downwards.
  • an adjusting screw 62 is screwed into the underside of part 14, which is provided with a disk-shaped or tab-shaped projection 64.
  • the outwardly projecting edge of this projection 64 engages in a groove 66 in the outside of the second mouthpiece 58.
  • the projection 64 is displaced in the direction of the double arrow 60, so that the second mouthpiece 48 is taken along.
  • a gap 68 between the two adjacent surfaces of the parts 12, 14 is indicated. This gap 68 only arises after loosening the fastening screws between the two Parts 12, 14. Now, by turning the adjusting screw 62, the second mouthpiece 58 can, as explained, be displaced in the direction of the double arrow 60. If the fastening screws are now tightened again, the gap 68 closes and the second mouthpiece 58 is clamped in the recess 56 between the two parts 12, 14 and thereby fixed.
  • a corresponding adjustment mechanism can be provided for the adjustment of the first mouthpiece 34.
  • the second mouthpiece 58 has a passage 70 which adjoins the channel 32 and which, viewed perpendicular to the plane of the drawing according to FIGS. 1 and 2, extends over the entire depth of the part 14. As can be seen from FIGS. 1 and 2, the passage 70 extends downward at an angle of approximately 30 ° to the channel 32, so that the air flow supplied is deflected accordingly.
  • the deflected air flow passes from the passage 70 into a storage space 72 which is formed between the opposite side wall of the first part 12 and a bevelled edge of the second mouthpiece 58. As can be seen, this storage space 72 tapers towards the edge 48 in a manner similar to the storage space 42 for the hot melt adhesive.
  • bevelled surface 74 which lies opposite the surface 50 of the first mouthpiece 34 and together with this forms the slit-shaped nozzle gap 51 which, depending on the Properties of the hot melt adhesive, in particular its flow properties, and the application requirements have a thickness of 0.1 to 1.0 mm, in particular 0.2 to 0.6 mm.
  • the second mouthpiece 58 has the wedge shape shown in FIG. 2, at least in its lower part.
  • the liquefied and thus flowable hotmelt adhesive is supplied under pressure via the bore 20 of the groove 36 in the first mouthpiece 34 and the air with overpressure via the bores 30, the channel 32 and the passage 70 in the second mouthpiece 58.
  • the two strongly accelerated media meet at the edge 48 at approximately a right angle and from there reach the slot-shaped nozzle gap 51 between the two surfaces 50, 74.
  • the strongly accelerated air flow experiences only a relatively small amount Deflection, since its storage space 72 extends approximately in the direction of the slot-shaped nozzle gap 51; however, the accelerated hot melt adhesive is deflected by an angle of almost 90 ° and thereby intimately mixed with the air stream which takes the hot melt adhesive with it and subsequently serves as a "driving means" for the hot melt adhesive.
  • the storage spaces 48, 72 and the slit-shaped nozzle gap 51 can be adjusted and certain operating conditions can be adapted.
  • mouthpieces 34, 58 are only screwed on, there is a modular structure, so that they can be exchanged without problems and thus adapted to other requirements.
  • the two parts 12, 14 can also be replaced individually and replaced by other parts.

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EP19890110046 1988-06-10 1989-06-02 Tête de pulvérisation pour liquides Withdrawn EP0345666A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19883819866 DE3819866A1 (de) 1988-06-10 1988-06-10 Spruehkopf zum verspruehen von fluessigen medien
DE3819866 1988-06-10

Publications (2)

Publication Number Publication Date
EP0345666A2 true EP0345666A2 (fr) 1989-12-13
EP0345666A3 EP0345666A3 (fr) 1990-10-24

Family

ID=6356321

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890110046 Withdrawn EP0345666A3 (fr) 1988-06-10 1989-06-02 Tête de pulvérisation pour liquides

Country Status (3)

Country Link
EP (1) EP0345666A3 (fr)
JP (1) JP2753329B2 (fr)
DE (1) DE3819866A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5409733A (en) * 1992-07-08 1995-04-25 Nordson Corporation Apparatus and methods for applying conformal coatings to electronic circuit boards
US5423935A (en) * 1992-07-08 1995-06-13 Nordson Corporation Methods for applying discrete coatings

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29617525U1 (de) * 1996-10-11 1996-12-12 Josef Schiele oHG, 56651 Niederzissen Lackierkopf
JP5830377B2 (ja) * 2011-12-28 2015-12-09 リンテック株式会社 シート貼付装置、およびシート貼付方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB560190A (en) * 1942-12-04 1944-03-23 Thomas Scott Sutherland Improved form of atomiser syphon
FR2288068A1 (fr) * 1974-10-15 1976-05-14 Boussois Sa Procede et dispositif pour deposer par pulverisation d'un liquide une couche mince a la surface d'un materiau en feuille, notamment pour le traitement a chaud d'une feuille de verre
DE2634494C2 (de) * 1976-07-31 1983-04-14 Bayer Ag, 5090 Leverkusen Neue Injektoren zur Flüssigkeitsbegasung
DE2924174C2 (de) * 1979-06-15 1984-04-19 Heinrich Bühnen KG Maschinenfabrik, Im- und Export, 2800 Bremen Verfahren und Düse eines Gerätes zum Aufbringen eines Klebers auf ein Substrat
US4349156A (en) * 1980-08-11 1982-09-14 Spraying Systems Company Efficiency nozzle
US4314670A (en) * 1980-08-15 1982-02-09 Walsh William A Jun Variable gas atomization
DE3543469A1 (de) * 1985-12-09 1987-06-11 Henning J Claassen Spruehkopf zum verspruehen eines thermoplastischen kunststoffes, insbesondere eines schmelzklebstoffes

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5409733A (en) * 1992-07-08 1995-04-25 Nordson Corporation Apparatus and methods for applying conformal coatings to electronic circuit boards
US5423935A (en) * 1992-07-08 1995-06-13 Nordson Corporation Methods for applying discrete coatings
US5683036A (en) * 1992-07-08 1997-11-04 Nordson Corporation Apparatus for applying discrete coatings

Also Published As

Publication number Publication date
JP2753329B2 (ja) 1998-05-20
JPH0243967A (ja) 1990-02-14
DE3819866A1 (de) 1989-12-14
EP0345666A3 (fr) 1990-10-24

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