EP0367985A2 - Nozzle attachment for an adhesive spray gun - Google Patents
Nozzle attachment for an adhesive spray gun Download PDFInfo
- Publication number
- EP0367985A2 EP0367985A2 EP89118357A EP89118357A EP0367985A2 EP 0367985 A2 EP0367985 A2 EP 0367985A2 EP 89118357 A EP89118357 A EP 89118357A EP 89118357 A EP89118357 A EP 89118357A EP 0367985 A2 EP0367985 A2 EP 0367985A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- adhesive
- nozzle
- plate
- air
- throughbore
- 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
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Classifications
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- 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
- B05B7/08—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point
- B05B7/0807—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets
- B05B7/0861—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets with one single jet constituted by a liquid or a mixture containing a liquid and several gas jets
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- 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
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- 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
- B05C5/0225—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 characterised by flow controlling means, e.g. valves, located proximate the outlet
Definitions
- This construction permits the drill bit to contact the plate at the surface of one of the sidewalls in the V-shaped groove which is substantially perpendicular to the axis of movement of the drill bit, i.e., at an angle of abut 30° to the first and second surfaces of the plate.
- sliding of the drill bit relative to the plate is minimized during the drilling or boring operation which helps locate the air jets bores at the desired angle in the plate.
- the one-piece annular plate is formed with a boss extending outwardly from a first, inner surface of the plate, and a nozzle tip extending inwardly from a second, outer surface of the plate toward its inner surface.
- a throughbore is formed between the boss and nozzle tip which communicates with the adhesive passageway in the nozzle when the plate is mounted thereto. Heated hot melt adhesive is transmitted through the nozzle and then into the throughbore in the plate from which it is ejected through a discharge outlet of the nozzle tip toward a substrate.
- the nozzle attachment 18 is an annular plate having one side formed with a first or inner surface 102 and an opposite side formed with a second or outer surface 104 spaced from the inner surface 102.
- inner refers to a direction toward the nozzle 14
- outer refers to a direction away from the nozzle 14 with the nozzle attachment 18 mounted to the nozzle 14 as shown in Fig. 1.
- the jet of pressurized air 128 ejected from air jet bore 118a is directed substantially tangent to the outer periphery of the throughbore 110 and the adhesive bead 130 ejected therefrom, as described below.
- the cap 62 is formed with an annular seat 132 which mates with an annular recess 134 formed in the peripheral edge of nozzle attachment 18 which extends inwardly from its outer surface 104.
- the cap 62 is threaded onto the lowermost end of the nozzle 14 so that the boss 106 on the inner surface 102 of nozzle attachment 18 extends within a seat 136 formed in the base of nozzle 14 at the adhesive discharge opening 57 of adhesive passageway 56.
- the inlet of each of the air jet bores 118 communicates with the annular air chamber 95 formed in the base of the nozzle 14 at the end of the air delivery passageway 94.
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- Nozzles (AREA)
Abstract
Description
- This invention is related to U.S. Patent Application Serial No. 07/041,712, filed April 23, 1987, and entitled "Adhesive Spray Gun and Nozzle Attachment", which is assigned to the same assignee as this invention.
- This invention relates to adhesive spray guns, and, more particularly, to an adhesive spray gun having a nozzle attachment for spraying hot melt adhesive in beads or fibers in a controlled spray pattern onto a substrate.
- Hot melt thermoplastic adhesives have been widely used in industry for adhering many types of products, and are particularly useful in applications where quick setting time is advantageous. One application for hot melt adhesive which has been of considerable interest in recent years is the bonding of non-woven fibrous material to a polyurethane substrate in articles such as disposable diapers, incontinence pads and similar articles.
- One aspect of forming an appropriate bond between the non-woven layer and polyurethane substrate of a disposable diaper, for example, is to avoid loss of adhesive in the valleys or gaps formed in the irregular surface of the chopped fibrous or fluff-type material which forms the non-woven layer. If the adhesive is discharged onto the non-woven layer in droplet form, for example, a portion of the droplets can fall between the gaps in the surface of the fibrous, non-woven material. As a result, additional quantities of adhesive are required to obtain the desired bond strength between the polyurethane substrate and non-woven material.
- This problem has been overcome in the prior art by forming hot melt thermoplastic adhesives in elongated, thin beads or fibers which are deposited atop the non-woven material and span the gaps in its irregular surface. Elongated beads or fibers of adhesive have been produced in prior art spray devices which include a nozzle formed with an adhesive discharge opening and one or more air jet orifices through which a jet of air is ejected. A bead of adhesive is ejected from the adhesive discharge opening in the nozzle which is then impinged by the air jets to attenuate or stretch the adhesive bead forming a thin fiber for deposition onto the substrate. Examples of spray devices of this type are disclosed in U.S. Patent Nos. 2,626,424 to Hawthorne, Jr.; 3,152,923 to Marshall et al; and, 4,185,981 to Ohsato et al.
- In applications such as the formation of disposable diapers, it is important to carefully control the spray pattern of adhesive fibers deposited onto the non-woven substrate in order to obtain the desired bond strength between the non-woven layer and polyurethane substrate using as little adhesive as possible. Improved control of the spray pattern of adhesive fibers has been obtained in prior art spray devices of the type described above by impacting the adhesive bead discharged from the nozzle with air jets directed substantially tangent to the adhesive bead. The tangentially applied air jets control the motion of the elongated fibers of adhesive formed from the adhesive bead ejected from the adhesive discharge opening in the gun nozzle, and confine the elongated fibers in a relatively tight, or compact, spiral pattern for application onto the substrate. Structure which produces a spiral spray pattern of adhesive fibers for deposition onto a substrate is disclosed, for example, in the '424 Hawthorne, Jr. patent and the '981 Ohsato et al patent mentioned above.
- In order to produce a compact spiral spray pattern of adhesive fibers in the spray devices described above, it is important to ensure that the air jets are directed tangentially relative to the bead of adhesive ejected from the nozzle of the spray device. This requires accurate placement of the bores or passageways through which pressurized air is ejected from the nozzle or gun body of the spray device, which are typically on the order of about 0.015 to 0.020 inches in diameter. The boring or drilling of passageways having such a small diameter at the appropriate angles in the nozzle and/or gun body of prior art spray devices is a relatively expensive and difficult machining operation.
- Many problems which prior art adhesive fiber spray systems have been overcome by the nozzle attachment disclosed in U.S. Patent Application Serial No. 07/041,712, filed April 23, 1987 and entitled "Adhesive Spray Gun and Nozzle Attachment" which is assigned to the same assignee as this invention. The nozzle attachment of that invention is adapted to mount to the nozzle of a standard adhesive spray gun which is formed with an adhesive discharge opening connected to an adhesive passageway in the gun body and an air discharge opening connected to an air passageway in the gun body. The nozzle attachment is a one-piece annular plate formed with a boss extending outwardly from a first surface of the plate and a nozzle tip extending outwardly from a second surface of the plate. A throughbore is formed between the boss and nozzle tip which communicates with the adhesive discharge opening in the nozzle of the gun body when the plate is mounted to the nozzle. Heated hot melt adhesive is transmitted through the adhesive passageway in the gun body, out its adhesive discharge opening and then into the throughbore in the plate. The adhesive is ejected as a bead through the nozzle tip toward a substrate.
- The annular plate is formed with a V-shaped notch or groove which extends from its first surface having the boss toward the second surface formed with the nozzle tip. The V-shaped groove is provided to assist in drilling air jet bores in the plate through which jets of pressurized air are directed at an angle of about 30° and tangent to the adhesive bead ejected from the nozzle tip. The annular V-shaped groove is formed with two sidewalls, one of which is disposed substantially perpendicularly to the longitudinal axis of each of the air jet bores. This construction permits the drill bit to contact the plate at the surface of one of the sidewalls in the V-shaped groove which is substantially perpendicular to the axis of movement of the drill bit, i.e., at an angle of
abut 30° to the first and second surfaces of the plate. As a result, sliding of the drill bit relative to the plate is minimized during the drilling or boring operation which helps locate the air jets bores at the desired angle in the plate. - While the nozzle attachment disclosed in Serial No. 07/041,712 solves many of the problems of prior art devices designed to spray adhesive fibers, some deficiencies have been discovered in certain applications. It has been found that the formation of a groove in the relatively thin nozzle attachment or plate can result in deflection of the nozzle attachment during operation. This deflection can form a leakage path at the interface between the nozzle attachment and nozzle of the spray gun. In some instances, it has been found that hot melt adhesive entering the nozzle attachment has flowed along this leakage path and been deposited in the V-shaped groove where the air flows into the air jet bores. This can clog the air jet bores and restrict the flow of air necessary to attenuate or stretch the adhesive bead to form adhesive fibers.
- Another potential problem with the nozzle attachment of Serial No. 07/041,712 is that the air jet bores are drilled in the plate or nozzle attachment from the inner side or surface which contacts the nozzle toward the outer side or surface formed with the nozzle tip. Because the air jet bores are so small in diameter, i.e., .015 to .020 inches, it is possible for the drill bit to drift or move off line in the course of passing through the nozzle attachment from its inner side to the outer side. As a result, the discharge outlet of the air jet bores at the outer side of the nozzle attachment might be slightly out of position and this can affect the efficiency of the nozzle attachment in forming adhesive fibers because the air jets may not impact the adhesive bead precisely tangentially thereto.
- The nozzle tip of the nozzle attachment disclosed in Serial No. 07/041,712 protrudes from the outer surface thereof when mounted to the nozzle of the gun body, and extends outwardly from a mounting nut which secures the nozzle attachment to the nozzle of the spray gun. A cavity or space is thus formed between the nozzle tip and such mounting nut. When the spray gun is operated intermittently, it has been found that cut-off drool, i.e., adhesive remaining after the gun is shut off, can collect in the space or cavity between the nozzle tip and mounting nut. This cut-off drool might collect and partially block the discharge outlet of the air jet bores formed in the nozzle attachment, thus affecting the performance of the nozzle attachment in forming adhesive fibers. Additionally, the protruding nozzle tip is exposed and can be damaged if it contacts the target substrate or other object during operation of the spray gun.
- It is therefore among the objectives of this invention to provide a nozzle attachment for use in a spray gun for spraying hot melt adhesive in elongated beads or fibers onto a substrate which is relatively inexpensive to manufacture, which provides accurately located air jets to attenuate or stretch an adhesive bead to form adhesive fibers, which avoids leakage of adhesive from the spray gun, which is rugged in construction, which resists clogging with adhesive and which is readily installed on a standard spray gun to convert the spray gun to one capable of spraying hot melt adhesive in fiber form.
- These objectives are accomplished in a nozzle attachment for a hot melt adhesive spray device which includes a gun body and a nozzle having an adhesive passageway and an air passageway. The nozzle attachment is a one-piece annular plate which is mounted by a cap or nut to the nozzle of the gun body.
- The nozzle attachment or plate is formed with a throughbore adapted to connect to the adhesive passageway in the nozzle, and a plurality of spaced air jet bores are formed in the plate which communicate with the air passageway in the nozzle. An adhesive bead is ejected from the throughbore in the plate which is impacted by air jets from the spaced air jet bores. The air jets are directed tangentially to the bead to both stretch the bead forming hot melt adhesive fibers, and to impart a spiral motion to the adhesive fibers so that they are deposited in a controlled spray pattern upon a substrate.
- The one-piece annular plate is formed with a boss extending outwardly from a first, inner surface of the plate, and a nozzle tip extending inwardly from a second, outer surface of the plate toward its inner surface. A throughbore is formed between the boss and nozzle tip which communicates with the adhesive passageway in the nozzle when the plate is mounted thereto. Heated hot melt adhesive is transmitted through the nozzle and then into the throughbore in the plate from which it is ejected through a discharge outlet of the nozzle tip toward a substrate.
- The annular plate of this invention is relatively thick from its inner surface to its outer surface in order to resist deflection with respect to the nozzle during operation of the spray gun. The inner surface of the plate is flat or planar except for the boss which extends outwardly therefrom. This inner surface forms an effective metal-to-metal seal with the mating surface of the nozzle of the spray gun when the plate is mounted thereto. As a result, adhesive transmitted from the nozzle into the throughbore of the plate is prevented from leaking at the interface therebetween.
- The annular plate forming the nozzle attachment of this invention is formed with an annular, V-shaped notch or groove which extends inwardly from the outer surface of the plate toward its inner surface. This V-shaped groove is provided to assist in the drilling operation of the air jet bores through which jets of pressurized air are directed from the air passageway in the nozzle, through the plate and then into contact with the adhesive bead ejected from the discharge outlet of the nozzle tip.
- In the presently preferred embodiment, each of the spaced air jet bores is drilled at an angle of approximately 30° with respect to the longitudinal axis of the throughbore in the plate from which the adhesive bead is ejected. In order to assist in drilling the air jet bores at this angle, the V-shaped notch or groove at the outer surface of the nozzle attachment forms two sidewalls. One of the sidewalls is oriented substantially perpendicularly to the longitudinal axis of each of the air jet bores. The other sidewall forms the outer surface of the nozzle tip such that the discharge outlet of the nozzle tip is substantially coplanar with the outer surface of the plate. The sidewall of the V-shaped groove oriented perpendicularly to the longitudinal axis of the air jet bores permits the drill bit to contact the plate at a surface which is substantially perpendicular to the axis of movement of the drill bit even though the drill bit is moved at a 30° angle with respect to the outer surface of the plate.
- The air jet bores formed in the nozzle attachment of this invention are drilled by movement of a drill bit from the outer surface of the nozzle attachment where the V-shaped groove is formed, toward the inner surface of the nozzle attachment which contacts the nozzle. As mentioned above, it is important that the outlet of the air jet bores be precisely located so that the air jets discharged therefrom tangentially impact the adhesive bead discharged from the nozzle tip of the nozzle attachment. Because the drilling operation begins at the outer surface of the nozzle attachment, the location of the outlet of the air jet bores at such outer surface can be precisely controlled. Any drift of the drill bit in moving through the nozzle attachment or plate has no effect on the location of the outlet of the air jet bores at the outer surface of the plate. This had sometimes presented a problem in the machining of the nozzle attachment disclosed in prior Application Serial No. 07/041,712 wherein the drilling operation proceeded from the inner surface of the plate toward the outer surface.
- In a presently preferred embodiment, the spaced air jet bores are also formed in the plate at an angle relative to the outer periphery of the throughbore and the adhesive bead ejected therefrom. The longitudinal axis of each air jet bore is oriented at an angle of approximately 10° with respect to a vertical plane which passes through the longitudinal axis of the throughbore in the plate and the center of such air jet bore at the V-shaped groove in the plate. As a result, the jets of pressurized air ejected from the spaced air jet bores impact the adhesive bead discharged from the nozzle tip of the plate at its outer periphery so as to impart a rotational movement to the bead. The adhesive bead is attenuated or stretched into elongated fibers upon impact with the air jets, and these fibers are then rotated by the air jets in a spiral motion to control the width of the spray pattern applied to the substrate.
- In the presently preferred embodiment, an annular recess is formed in the nozzle attachment or plate which extends inwardly at the peripheral edge of the plate from its outer surface toward the inner surface. This annular recess forms a seat which receives the mounting nut or cap which mounts the nozzle attachment to the nozzle of the spray gun. Preferably, the outer surface of the nozzle attachment and the discharge outlet of the nozzle tip are coplanar with the mounting cap or nut when the nozzle attachment is mounted to the spray gun nozzle.
- This construction has two advantages. First, there is no space or cavity formed between the mounting nut and nozzle tip in which cut-off drool or strands of adhesive could collect to block the air jet bores. This had been a problem in the aforementioned patent application Serial No. 07/041,712 wherein a gap was formed between the nozzle tip and mounting nut. Secondly, the mounting nut, the outer surface of the nozzle attachment and the discharge outlet of the nozzle tip are all coplanar. This prevents the nozzle tip from contacting the substrate or another object during separation of the spray gun where it could be damaged.
- The nozzle attachment or plate of this invention provides an economical means to convert a standard spray gun into one in which hot melt adhesive may be discharged in elongated strands or fibers for applications such as bonding the non-woven and polyurethane layers of disposable diapers or other hygienic articles. The construction of the nozzle attachment or plate prevents leakage of adhesive at its interface with the nozzle, facilitates the accurate drilling of air jet bores so that the adhesive bead discharged from the spray device is consistently formed into elongated fibers and resists clogging from build-up of cut-off drool. The nozzle attachment or plate is easily removed from the spray gun and replaced with another nozzle attachment of different size to accommodate different applications and/or different spray guns.
- The structure, operation and advantages of the presently preferred embodiment of this invention will become further apparent upon consideration of the following description, taken in conjunction with the accompanying drawings, wherein:
- Fig. 1 is a cross sectional view of a spray gun incorporating the nozzle attachment herein with a schematic view of a manifold mounted to the spray gun;
- Fig. 2 is an enlarged cross sectional view of the nozzle attachment herein showing an adhesive bead impacted by air jet streams; and
- Fig. 3 is a top plan view of the nozzle attachment shown in Fig. 2.
- Referring now to Fig. 1, an adhesive spray device 10 is illustrated comprising a
gun body 12 having a nozzle 14 connected at one end, and anadhesive manifold 16 andair manifold 17 mounted to thegun body 12. Theair manifold 17 is mounted to theadhesive manifold 16 by two or more screws 19, each of which extend through aspacer 21 extending between themanifolds nozzle attachment 18 from which a bead of heated hot melt adhesive is discharged and formed into a thin, elongated bead or fiber which is rotated in a compact spiral spray pattern onto a substrate, as discussed in detail below. The structure of thegun body 12 andmanifolds - As shown in Fig. 1, the upper portion of
gun body 12 is formed with anair cavity 20 which receives the upper end of aplunger 22 mounted to aseal 24. Theseal 24 is slidable within theair cavity 20 and provides an airtight seal along its walls. Acollar 26 is mounted to the upper end ofgun body 12, such as bybolts 28, which is formed with a throughbore defining an inner, threadedwall 30. Thecollar 26 receives aplug 32 having external threads which mate with the threadedwall 30 of thecollar 26. Theplug 32 is hollow and aspring 34 is mounted in its interior which extends between the top end of theplunger 22 and the head 36 ofplug 32 having ascrew slot 38. Alock nut 40 is threaded onto theplug 32 into engagement with the top edge of thecollar 26. - The
plug 32 is rotatable with respect to thecollar 26 to vary the force applied by thespring 34 against the top edge ofplunger 22. In order to rotate theplug 32, thelock nut 40 is first rotated to disengage thecollar 26 after which a screwdriver is inserted into thescrew slot 38 in the head 36 ofplug 32 and rotated to move theplug 32, and in turn increase or decrease the compression force ofspring 34 within thecollar 26. - The
plunger 22 is sealed at the base of theair cavity 20 by aseal 42 which permits axial movement of theplunger 22 therealong. Theplunger 22 extends downwardly through thegun body 12 from theair cavity 20 through a stepped bore 44 which leads into anadhesive cavity 46 having aseal 48 at its upper end and aplunger mount 50 at its lower end. Aspring 51 carried around theplunger 22 is disposed within theadhesive cavity 46 and extends between theseal 48 and plunger mount 50 to hold theseal 48 in place. Thisseal 48 and seal 42 aid in guiding the axial movement ofplunger 22 within thegun body 12. - The upper end of the nozzle 14 extends into the
adhesive cavity 46 and is sealed thereto by an O-ring 52. The nozzle 14 is fixed to thegun body 12 byscrews 54. Theplunger 22 extends downwardly from theadhesive cavity 46 and plunger mount 50 into anadhesive passageway 56 formed in the nozzle 14 which terminates at anadhesive discharge opening 57. Immediately upstream from theadhesive discharge opening 57, theadhesive passageway 56 is formed with a conical-shapedseat 58 which mates with theterminal end 59 of theplunger 22. As discussed below, movement of theplunger 22 relative to theseat 58 controls the flow of heated hot melt adhesive ejected fromadhesive passageway 56 through itsadhesive discharge opening 57. - The nozzle 14 is also formed with a reduced diameter portion having
external threads 60 which mate with internal threads formed in acap 62. As described below, thecap 62 mounts thenozzle attachment 18 to the base of nozzle 14 in communication with the discharge opening 57 ofadhesive passageway 56. - The
gun body 12 is mounted to theadhesive manifold 16 by mountingbolts 64. In turn, theadhesive manifold 16 is supported on abar 66 by a mountingblock 68 connected to theadhesive manifold 16 withscrews 70. As illustrated at the top of Fig. 1, the mountingblock 68 is formed with a slot 72 forming twohalf sections 73, 75 which receive thebar 66 therebetween. Abolt 74 spans thehalf sections 73, 75 of the mounting block formed by the slot 72 and tightens them down against thebar 66 to secure the mountingblock 68 thereto. - The
adhesive manifold 16 is formed with ajunction box 76 which receives anelectric cable 78 to supply power to aheater 80 and anRTD 82. Theheater 80 maintains the hot melt adhesive in a molten state when it is introduced into theadhesive manifold 16 through an adhesive inlet line 84 from a source of hot melt adhesive (not shown). The adhesive inlet line 84 communicates through aconnector line 86 formed in thegun body 12 with theadhesive cavity 46. An O-ring 85 is provided between thegun body 12 andadhesive manifold 16 at the junction of the adhesive inlet line 84 andconnector line 86 to form a seal therebetween. Operating air for theplunger 22 is supplied through aninlet line 88 formed in theadhesive manifold 16 which is joined by aconnector line 90 to theair cavity 20. Thegun body 12 and manifold are sealed thereat by an O-ring 89. - The
air manifold 17 is formed with anair inlet line 92 connected to anair delivery passageway 94 formed in the nozzle 14 which terminates in anannular chamber 95 at the base of the nozzle 14. O-ring seal 96 forms a fluid-tight seal between the nozzle 14 andair manifold 17 at the intersection ofair inlet line 92 andair delivery passageway 94. - Referring now to the bottom of Fig. 1 and to Figs. 2 and 3, the
nozzle attachment 18 of this invention is shown in detail. Thenozzle attachment 18 is an annular plate having one side formed with a first orinner surface 102 and an opposite side formed with a second orouter surface 104 spaced from theinner surface 102. For purposes of the present description, the term "inner" refers to a direction toward the nozzle 14, and the term "outer" refers to a direction away from the nozzle 14 with thenozzle attachment 18 mounted to the nozzle 14 as shown in Fig. 1. - A
boss 106 extends outwardly from theinner surface 102, and anozzle tip 108 extends inwardly from theouter surface 104 in alignment with theboss 106. Athroughbore 110 is drilled in thenozzle attachment 18 between theboss 106 andnozzle tip 108 forming adischarge outlet 109 in thenozzle tip 108 which is coplanar with theouter surface 104 ofnozzle attachment 18. Thethroughbore 110 has a diameter in the range of about 0.010 to 0.040 inches, and preferably in the range of about 0.0175 to 0.0185 inches. - An annular, V-shaped
groove 112 is formed in thenozzle attachment 18 which extends inwardly from itsouter surface 104 toward theinner surface 102. Theannular groove 112 defines a pair ofsidewalls sidewall 116 is formed at approximately a 30° angle with respect to the planarouter surface 104 of thenozzle attachment 18, and thesidewall 114 forms the outer surface of thenozzle tip 108. As best shown in Figs. 2 and 3, six air jet bores 118 are formed in thenozzle attachment 18 between theannular groove 112 and theinner surface 102, preferably at an angle of approximately 30° with respect to the longitudinal axis of thethroughbore 110. The diameter of the air jet bores 118 is in the range of about 0.010 to 0.040 inches, and preferably in the range of about 0.017 to 0.019 inches. - The
annular groove 112 facilitates accurate drilling of the air jet bores 118 so that they are formed at the desired angle relative to throughbore 110 and are precisely located at the desired position along thesidewall 116 ofgroove 112. By forming thesidewall 116 at a 30° angle relative to theupper surface 102 ofnozzle attachment 18, a drill bit (not shown) can enter theannular groove 112 in thenozzle attachment 18 at a 30° angle relative to itsouter surface 104, but contact thesidewall 116 formed by theannular groove 112 at a 90° angle. As a result, the drilling operation is performed with minimal slippage between the drill bit andnozzle attachment 18. This allows theoutlet 119 of the air jet bores 118 to be precisely positioned at thesidewall 116 and oriented at the appropriate angles relative tothroughbore 110. In the event of any drift of the drill bit as it moves through thenozzle attachment 18 to theinner surface 102, theinlet 121 of the air jet bores 118 may be slightly out of position but would nevertheless intersect theannular chamber 95 formed in nozzle 14. - As shown in Fig. 3, the longitudinal axis of each of the air jet bores 118 is angled approximately 10° with respect to a vertical plane passing through the longitudinal axis of the
throughbore 110 and the center of eachsuch bore 118 at theannular groove 112. For example, thelongitudinal axis 122 ofair jet bore 118a is angled approximately 10° relative to a vertical plane passing through thelongitudinal axis 124 ofthroughbore 110 and thecenter point 126 ofbore 118a at theannular groove 112 innozzle attachment 18. As a result, the jet ofpressurized air 128 ejected fromair jet bore 118a is directed substantially tangent to the outer periphery of thethroughbore 110 and theadhesive bead 130 ejected therefrom, as described below. - Referred now to Figs. 1 and 2, the
cap 62 is formed with anannular seat 132 which mates with anannular recess 134 formed in the peripheral edge ofnozzle attachment 18 which extends inwardly from itsouter surface 104. Thecap 62 is threaded onto the lowermost end of the nozzle 14 so that theboss 106 on theinner surface 102 ofnozzle attachment 18 extends within a seat 136 formed in the base of nozzle 14 at the adhesive discharge opening 57 ofadhesive passageway 56. With thenozzle attachment 18 in this position, the inlet of each of the air jet bores 118 communicates with theannular air chamber 95 formed in the base of the nozzle 14 at the end of theair delivery passageway 94. No O-rings or other seals are required between theinner surface 102 of thenozzle attachment 18 and the nozzle 14 in order to create a fluid-tight seal therebetween and between theboss 106 andadhesive discharge opening 57. Thenozzle attachment 18 is easily removed and replaced by another attachment of different size by rotating thecap 62 out of engagement with the nozzle 14. - The operation of the spray device 10 of this invention is as follows. Heated hot melt adhesive is introduced into the
adhesive cavity 46 of thegun body 12 through the adhesive inlet line 84. Adhesive flows from theadhesive cavity 46 into the nozzle 14 through theadhesive passageway 56. With theterminal end 59 of theplunger 22 in engagement with theseat 58 formed at the end of theadhesive passageway 56, as illustrated in Fig. 1, the adhesive is not permitted to flow through the adhesive discharge opening 57 of theadhesive passageway 56 to thethroughbore 110. In order to retract theplunger 22 and permit the flow of adhesive into thedischarge opening 57, operating air is introduced through the operatingair line 88 into theair cavity 20 in thegun body 12. This pressurized air acts against theseal 24 connected to theplunger 22 which forces theplunger 22 upwardly so that itsterminal end 59 disengages theseat 58 at the lower end of theadhesive passageway 56. Theplunger 22 is returned to its closed position by discontinuing the flow of air to theair cavity 20 allowing thereturn spring 34 to move theplunger 22 back into a seated position. - The flow of hot melt adhesive through the adhesive discharge opening 57 of
adhesive passageway 56 is transmitted into thethroughbore 110 ofnozzle attachment 18 from which it is discharged through thedischarge outlet 109 ofnozzle tip 108 to form theadhesive bead 130. At the same time theadhesive bead 130 is formed and ejected from thenozzle attachment 18, pressurized air is directed through theair inlet line 92,air delivery passageway 94 andair chamber 95 to the air jet bores 118 formed in thenozzle attachment 18. - As best shown in Fig. 2, the air jet bores 118 are angled relative to the longitudinal axis of the
throughbore 110 so that the jets ofair 128 flowing therethrough impact theadhesive bead 130 substantially tangent to its outer periphery at a point spaced below thenozzle tip 108. The air ejected from the air jet bores 118 performs two functions. First, the jets ofair 128 attenuate or stretch theadhesive bead 130 forming elongated strands or fibers of hot melt adhesive for deposit onto a substrate. Additionally, since the air jet bores 118 are oriented to direct jets ofair 128 tangent to the outer periphery of theadhesive bead 130, theadhesive bead 130 and adhesive fibers formed therefrom are rotated in a compact spiral path toward a substrate. As a result, a controlled pattern of adhesive having a desired width is obtained on the substrate. - While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the air that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed as the best mode contemplated for carrying out this invention, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (7)
a one-piece annular plate formed with a first surface on one side of said plate, and a second surface on an opposite side of said plate;
a nozzle tip formed in said plate which extends inwardly from said second surface toward said first surface, said nozzle tip having an adhesive discharge outlet located in substantially the same plane as said second surface of said plate;
said plate being formed with a throughbore extending between said first surface of said one side of said plate and said adhesive discharge outlet of said nozzle tip, said plate being adapted to mount to said nozzle of said gun body so that said first surface communicates with said air delivery passageway in said nozzle and so that said throughbore communicates with said adhesive passageway in said nozzle for receiving heated hot melt adhesive, the hot melt adhesive being ejected from said adhesive discharge outlet of said nozzle tip to form an adhesive bead;
said plate being formed with a substantially V-shaped annular groove forming first and second sidewalls each extending inwardly from said second surface toward said first surface and intersecting one another, one of said first and second sidewalls of said V-shaped annular groove forming the outer surface of said nozzle tip;
said plate being formed with a plurality of air jet bores extending from said V-shaped annular groove to said first surface of said plate, said air jet bores communicating with said air delivery passageway in said nozzle for transmitting air therethrough, said air jet bores each having a longitudinal axis extending substantially perpendicular to the other of said first and second sidewalls of said V-shaped annular groove, said air jet bores being formed at an angle with respect to said throughbore in said plate to direct pressurized air flowing therethrough substantially tangent to the outer periphery of said adhesive bead ejected from said adhesive discharge outlet of said nozzle tip to form said adhesive bead in elongated adhesive fibers and to impart a twisting motion to said elongated adhesive fibers to form a spiral spray pattern of elongated adhesive fibers for deposition on a substrate.
a gun body having a nozzle formed with an adhesive passageway communicating with a source of heated hot melt adhesive and an air passageway communicating with a source of pressurized air;
a one-piece annular plate formed with a boss extending outwardly from a first surface of said plate and a nozzle tip extending inwardly from a second surface of said plate toward said first surface, said nozzle tip having an adhesive discharge outlet located in substantially the same plane as said second surface of said plate, said plate being formed with a throughbore extending between said boss and said adhesive discharge outlet of said nozzle tip;
said plate being formed with a substantially V-shaped annular groove forming first and second sidewalls each extending inwardly from said second surface toward said first surface and intersecting one another, one of said first and second sidewalls of said V-shaped annular groove forming the outer surface of said nozzle tip;
said plate being formed with a plurality of air jet bores extending from said V-shaped annular groove to said first surface of said plate, said air jet bores each having a longitudinal axis extending substantially perpendicular to the other of said first and second sidewalls of said V-shaped annular groove and at an angle relative to the longitudinal axis of said throughbore is said plate;
cap means for mounting said plate to said nozzle of said gun body so that said throughbore formed between said boss and said adhesive discharge outlet of said nozzle tip communicates with said adhesive passageway in said nozzle and said air jet bores communicate with said air passageway in said nozzle, said throughbore receiving heated hot melt adhesive from said adhesive passageway and ejecting the heated hot melt adhesive from said adhesive discharge outlet of said nozzle tip to form an adhesive bead, said air jet bores receiving pressurized air from said air passageway in said nozzle and directing the pressurized air substantially tangent to the outer periphery of said adhesive bead to form elongated adhesive fibers and to impart a twisting motion to said elongated adhesive fibers to form a spiral spray pattern of elongated adhesive fibers for deposition on a substrate.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US268002 | 1981-05-28 | ||
US26800288A | 1988-11-07 | 1988-11-07 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0367985A2 true EP0367985A2 (en) | 1990-05-16 |
EP0367985A3 EP0367985A3 (en) | 1990-08-08 |
EP0367985B1 EP0367985B1 (en) | 1995-02-01 |
Family
ID=23021060
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19890118357 Expired - Lifetime EP0367985B1 (en) | 1988-11-07 | 1989-10-04 | Nozzle attachment for an adhesive spray gun |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0367985B1 (en) |
JP (1) | JP2820740B2 (en) |
AU (1) | AU620920B2 (en) |
CA (1) | CA1316343C (en) |
DE (1) | DE68920950T2 (en) |
Cited By (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0474155A2 (en) * | 1990-09-06 | 1992-03-11 | Nordson Corporation | Nozzle cap for an adhesive dispenser |
DE4208884A1 (en) * | 1991-03-27 | 1992-10-01 | Sca Schucker Gmbh | METHOD AND DEVICE FOR APPLYING A PASTOUS MASS |
US5169071A (en) * | 1990-09-06 | 1992-12-08 | Nordson Corporation | Nozzle cap for an adhesive dispenser |
DE19714029A1 (en) * | 1997-04-04 | 1998-10-08 | Bargen Rudolf Von | Application head |
DE19748908C1 (en) * | 1997-11-05 | 1999-04-22 | Wolfgang Puffe | Applicator head for viscous medium, particularly hot smelt adhesive |
EP0865873A3 (en) * | 1997-03-20 | 1999-04-28 | Comotti MC S.r.l. | Dosage and dispensing gun, particularly for dispensing polishing paste |
WO1999032233A1 (en) | 1997-12-22 | 1999-07-01 | Wolfgang Puffe | Rotary applicator head |
DE19757238C2 (en) * | 1997-12-22 | 1999-11-25 | Wolfgang Puffe | Rotary application head |
WO1999062642A1 (en) | 1998-06-03 | 1999-12-09 | Wolfgang Puffe | Method and device for applying liquid media |
EP1285699A1 (en) * | 2001-08-11 | 2003-02-26 | Amtec Kistler GmbH | Apparatus for applying a coating agent |
KR20030032475A (en) * | 2001-10-18 | 2003-04-26 | 기아자동차주식회사 | Swirl Type Sealing Gun |
WO2005107957A1 (en) | 2004-04-29 | 2005-11-17 | The Procter & Gamble Company | Extrusion applicator having rotational operability |
WO2005107958A1 (en) | 2004-04-29 | 2005-11-17 | The Procter & Gamble Company | Extrusion applicator having linear motion operability |
US7524176B2 (en) | 2005-06-16 | 2009-04-28 | Sika Technology Ag | Nozzle for applying adhesives |
DE102013101637A1 (en) | 2013-02-19 | 2014-08-21 | Puffe Engineering Gmbh | Application head for viscous media, particularly hot melt adhesive, has outlet nozzle and piston cylinder unit, where piston surface has longitudinal extension in direction of longitudinal axis |
CN111992429A (en) * | 2020-08-07 | 2020-11-27 | 定兴县凌诺商贸有限公司 | Glue applying robot |
CN112588519A (en) * | 2020-12-09 | 2021-04-02 | 张紫爽 | Gluing device for gluing corrugated boards |
CN115301431A (en) * | 2022-09-14 | 2022-11-08 | 华能国际电力股份有限公司 | High-viscosity slurry atomizing nozzle for inner wall of boiler pipe of thermal power generating unit |
CN115502011A (en) * | 2022-10-18 | 2022-12-23 | 东莞鹏龙光电有限公司 | Intelligent production equipment for producing display module |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102018211676A1 (en) | 2018-07-12 | 2020-01-16 | AUDI HUNGARIA Zrt. | Protective cap element and nozzle with a protective cap element |
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US3152923A (en) * | 1961-11-07 | 1964-10-13 | Huntingdon Ind Inc | Apparatus for spraying adhesive on cartons |
DE2553664A1 (en) * | 1974-12-09 | 1976-06-10 | Airprint Syst | SPRAY UNIT |
US4185981A (en) * | 1975-08-20 | 1980-01-29 | Nippon Sheet Glass Co.,Ltd. | Method for producing fibers from heat-softening materials |
GB1587898A (en) * | 1977-03-22 | 1981-04-15 | Skm Sa | Method of and apparatus for pneumatically spraying liquid products |
WO1981001670A1 (en) * | 1979-12-18 | 1981-06-25 | J Amiaut | Improved gun for applying paints by hot process |
EP0222379A2 (en) * | 1985-11-15 | 1987-05-20 | Henning J. Claassen | Device for spraying coating products |
EP0333902A1 (en) * | 1988-03-23 | 1989-09-27 | Nordson Corporation | Device for applying a thermoplastic, highly polymeric material, in particular an adhesive |
-
1989
- 1989-09-28 CA CA000614019A patent/CA1316343C/en not_active Expired - Fee Related
- 1989-10-04 EP EP19890118357 patent/EP0367985B1/en not_active Expired - Lifetime
- 1989-10-04 DE DE1989620950 patent/DE68920950T2/en not_active Expired - Fee Related
- 1989-10-10 AU AU42757/89A patent/AU620920B2/en not_active Ceased
- 1989-11-07 JP JP1288075A patent/JP2820740B2/en not_active Expired - Fee Related
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
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US3152923A (en) * | 1961-11-07 | 1964-10-13 | Huntingdon Ind Inc | Apparatus for spraying adhesive on cartons |
DE2553664A1 (en) * | 1974-12-09 | 1976-06-10 | Airprint Syst | SPRAY UNIT |
US4185981A (en) * | 1975-08-20 | 1980-01-29 | Nippon Sheet Glass Co.,Ltd. | Method for producing fibers from heat-softening materials |
GB1587898A (en) * | 1977-03-22 | 1981-04-15 | Skm Sa | Method of and apparatus for pneumatically spraying liquid products |
WO1981001670A1 (en) * | 1979-12-18 | 1981-06-25 | J Amiaut | Improved gun for applying paints by hot process |
EP0222379A2 (en) * | 1985-11-15 | 1987-05-20 | Henning J. Claassen | Device for spraying coating products |
EP0333902A1 (en) * | 1988-03-23 | 1989-09-27 | Nordson Corporation | Device for applying a thermoplastic, highly polymeric material, in particular an adhesive |
Cited By (27)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0474155A3 (en) * | 1990-09-06 | 1992-07-15 | Nordson Corporation | Nozzle cap for an adhesive dispenser |
US5169071A (en) * | 1990-09-06 | 1992-12-08 | Nordson Corporation | Nozzle cap for an adhesive dispenser |
EP0474155A2 (en) * | 1990-09-06 | 1992-03-11 | Nordson Corporation | Nozzle cap for an adhesive dispenser |
USRE36534E (en) * | 1991-03-27 | 2000-01-25 | Sca Schucker Gmbh | Method and device for applying a paste |
DE4208884A1 (en) * | 1991-03-27 | 1992-10-01 | Sca Schucker Gmbh | METHOD AND DEVICE FOR APPLYING A PASTOUS MASS |
US5510149A (en) * | 1991-03-27 | 1996-04-23 | Sca Schucker Gmbh | Method and device for applying a paste |
EP0865873A3 (en) * | 1997-03-20 | 1999-04-28 | Comotti MC S.r.l. | Dosage and dispensing gun, particularly for dispensing polishing paste |
DE19714029A1 (en) * | 1997-04-04 | 1998-10-08 | Bargen Rudolf Von | Application head |
DE19714029C2 (en) * | 1997-04-04 | 1999-06-10 | Bargen Rudolf Von | Application head |
DE19748908C1 (en) * | 1997-11-05 | 1999-04-22 | Wolfgang Puffe | Applicator head for viscous medium, particularly hot smelt adhesive |
DE19757238C2 (en) * | 1997-12-22 | 1999-11-25 | Wolfgang Puffe | Rotary application head |
WO1999032233A1 (en) | 1997-12-22 | 1999-07-01 | Wolfgang Puffe | Rotary applicator head |
WO1999062642A1 (en) | 1998-06-03 | 1999-12-09 | Wolfgang Puffe | Method and device for applying liquid media |
EP1285699A1 (en) * | 2001-08-11 | 2003-02-26 | Amtec Kistler GmbH | Apparatus for applying a coating agent |
KR20030032475A (en) * | 2001-10-18 | 2003-04-26 | 기아자동차주식회사 | Swirl Type Sealing Gun |
US7169228B2 (en) | 2004-04-29 | 2007-01-30 | The Procter & Gamble Company | Extrusion applicator having linear motion operability |
WO2005107958A1 (en) | 2004-04-29 | 2005-11-17 | The Procter & Gamble Company | Extrusion applicator having linear motion operability |
US7097710B2 (en) | 2004-04-29 | 2006-08-29 | The Procter & Gamble Company | Extrusion applicator having rotational operability |
WO2005107957A1 (en) | 2004-04-29 | 2005-11-17 | The Procter & Gamble Company | Extrusion applicator having rotational operability |
US7524176B2 (en) | 2005-06-16 | 2009-04-28 | Sika Technology Ag | Nozzle for applying adhesives |
DE102013101637A1 (en) | 2013-02-19 | 2014-08-21 | Puffe Engineering Gmbh | Application head for viscous media, particularly hot melt adhesive, has outlet nozzle and piston cylinder unit, where piston surface has longitudinal extension in direction of longitudinal axis |
DE102013101637B4 (en) * | 2013-02-19 | 2017-02-16 | Puffe Engineering Gmbh | Application head for viscous media |
CN111992429A (en) * | 2020-08-07 | 2020-11-27 | 定兴县凌诺商贸有限公司 | Glue applying robot |
CN112588519A (en) * | 2020-12-09 | 2021-04-02 | 张紫爽 | Gluing device for gluing corrugated boards |
CN115301431A (en) * | 2022-09-14 | 2022-11-08 | 华能国际电力股份有限公司 | High-viscosity slurry atomizing nozzle for inner wall of boiler pipe of thermal power generating unit |
CN115301431B (en) * | 2022-09-14 | 2023-08-15 | 华能国际电力股份有限公司 | High-viscosity slurry atomization nozzle for inner wall of boiler tube of thermal power generating unit |
CN115502011A (en) * | 2022-10-18 | 2022-12-23 | 东莞鹏龙光电有限公司 | Intelligent production equipment for producing display module |
Also Published As
Publication number | Publication date |
---|---|
EP0367985B1 (en) | 1995-02-01 |
DE68920950T2 (en) | 1995-06-22 |
JPH02180658A (en) | 1990-07-13 |
AU620920B2 (en) | 1992-02-27 |
DE68920950D1 (en) | 1995-03-16 |
EP0367985A3 (en) | 1990-08-08 |
JP2820740B2 (en) | 1998-11-05 |
CA1316343C (en) | 1993-04-20 |
AU4275789A (en) | 1990-05-10 |
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