AU1719688A - Creation of Inventions and Patents with Artificial Intelligence

AU1719688A – Method and apparatus for spraying hot melt adhesive elongatedfibers in spiral patterns by two or more side-by-side spray devices
– Google Patents

AU1719688A – Method and apparatus for spraying hot melt adhesive elongatedfibers in spiral patterns by two or more side-by-side spray devices
– Google Patents
Method and apparatus for spraying hot melt adhesive elongatedfibers in spiral patterns by two or more side-by-side spray devices

Info

Publication number
AU1719688A

AU1719688A
AU17196/88A
AU1719688A
AU1719688A
AU 1719688 A
AU1719688 A
AU 1719688A
AU 17196/88 A
AU17196/88 A
AU 17196/88A
AU 1719688 A
AU1719688 A
AU 1719688A
AU 1719688 A
AU1719688 A
AU 1719688A
Authority
AU
Australia
Prior art keywords
adhesive
dispensing device
air
bead
elongated
Prior art date
1987-06-16
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
AU17196/88A
Other versions

AU598993B2
(en

Inventor
Bentley J. Boger
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.)
1987-06-16
Filing date
1988-05-06
Publication date
1989-01-19

1988-05-06
Application filed by Nordson Corp
filed
Critical
Nordson Corp

1989-01-19
Publication of AU1719688A
publication
Critical
patent/AU1719688A/en

1990-07-05
Application granted
granted
Critical

1990-07-05
Publication of AU598993B2
publication
Critical
patent/AU598993B2/en

2008-05-06
Anticipated expiration
legal-status
Critical

Status
Ceased
legal-status
Critical
Current

Links

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Classifications

A—HUMAN NECESSITIES

A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE

A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS

A61F13/00—Bandages or dressings; Absorbent pads

A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators

A61F13/15577—Apparatus or processes for manufacturing

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

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

B05B7/10—Spray pistols; Apparatus for discharge producing a swirling discharge

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

B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL

B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important

B05C9/08—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation

B05C9/10—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation the auxiliary operation being performed before the application

Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC

Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture

Y10T156/17—Surface bonding means and/or assemblymeans with work feeding or handling means

Y10T156/1798—Surface bonding means and/or assemblymeans with work feeding or handling means with liquid adhesive or adhesive activator applying means

Description

Adhesive Spray Apparatus
Field of the Invention
This invention relates to an adhesive spray apparatus, and, more particularly, to an adhesive spray apparatus having a number of spray guns posi¬ tioned side-by-side above a substrate, each of which spray elongated fibers of hot melt adhesive in spiral spray patterns which are controlled so that adjacent spray patterns do not interfere with one another.
Background of the Invention
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 appli¬ cation for hot melt adhesive which has been of consid¬ erable 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 sub¬ strate 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 dis¬ charge 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 sub- strate. 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 substrates 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 directing the air jets which impact the adhesive bead discharged from the nozzle substantially tangent to the outer periphery of the adhesive bead. The tangentially directed air jets rotate the elongated fibers of adhesive formed from the adhesive bead ejected from the adhesive discharge opening in the gun nozzle in a relatively tight, compact spiral pattern for applica¬ tion 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 ‘981 Ohsato et al patent mentioned above.
In order to obtain a spray pattern upon a substrate which is wider than that produced by a single gun, while at the same time controlling the

location of the pattern or the substrate, two or more spray guns each effective to produce a separate spiral spray pattern are required. To avoid gaps in the adhesive layer applied to the substrate, and/or prevent overlapping of adjacent spray patterns which could result in an unwanted buildup of adhesive, the separate spiral spray patterns from adjacent guns are preferably tangent to one another at or near the surface of the substrate. This has presented a problem in the prior art wherein adjacent rotating spiral spray patterns form eddies or turbulence in the area where they contact one another. This turbulence disrupts the spray pattern near the surface of the substrate and also tends to lift at least some of the attenuated adhesive fibers back upstream toward the spray guns where they adhere to the equipment. It also creates gaps in the spray, pattern.
Summary of the Invention
It is therefore among the objectives of this invention to provide an adhesive spray apparatus which is capable of dispensing a relatively wide spray pattern onto a substrate from a number of individual spray guns while avoiding interference between the spray patterns from adjacent guns.
This objective is accomplished in an adhe¬ sive spray apparatus in which two or more spray

devices are positioned side-by-side above a substrate and produce counter-rotating spiral spray patterns of hot melt adhesive fibers, i.e., alternating clockwise and counterclockwise rotating spray patterns. The spray patterns from adjacent guns are tangent to one another at or near the surface of the substrate to be coated, but avoid interference with one another upon impact so as to eliminate the creation of eddies or turbulence which could disrupt the spray pattern on the substrate.
In the presently preferred embodiment, the spray apparatus comprises two or more adhesive spray guns mounted side-by-side to a manifold having an adhesive supply passageway connected to a source of hot melt adhesive and an air supply passageway con¬ nected to a source of pressurized air. Each of the spray guns is formed with a nozzle having an adhesive discharge passageway communicating with the adhesive supply passageway of the manifold. The nozzle is also provided with a plurality of air jets each communi¬ cating with the air supply passageway of the manifold. A bead of hot melt adhesive is ejected from each nozzle which is impacted at its outer periphery by jets of air from the air discharge orifices of the nozzle to attenuate the adhesive bead forming elongat¬ ed adhesive fibers, and to impart a rotation or

twisting motion to the elongated fibers forming a spiral spray pattern.
The air discharge orifices in the nozzle of one spray gun are oriented to impart a clockwise rotation to the elongated adhesive fibers formed thereat, and the air discharge orifices in the nozzle of an adjacent spray gun are oriented to impart a counterclockwise mot-ion to the elongated fibers formed at such adjacent nozzle. The counter-rotating spiral spray patterns from the two nozzles preferably contact one another at or near the surface of the target substrate, but do not deflect or interfere with each other and therefore avoid the formation of eddies or turbulence which can disrupt the spray pattern.
In a presently preferred embodiment, the nozzle of each of the spray guns is provided with a nozzle attachment in the form of a one-piece annular plate which is mounted by a cap to the nozzle. The nozzle attachment or plate is formed with a through- bore adapted to connect to the adhesive discharge opening in the nozzle, and a plurality of spaced air jet bores which communicate with the air discharge opening 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 fibers so that they are deposited in a controlled spray pattern upon the substrate.
In the nozzle attachment for one spray gun, the spaced air jet bores are formed at an angle relative to the outer periphery of the throughbore therein and the adhesive bead ejected from the throughbore. The longitudinal axis of each air jet bore is angled- approximately 10° with respect to a vertical plane which passes through the longitudinal axis of the throughbore in the plate and the center of each such air jet bore at the top surface of the plate. As a result, the jets of pressurized * air ejected from the spaced air jet bores impact the adhesive bead discharged from the throughbore of the plate at its outer periphery so as to impart a rota¬ tional movement to the bead in one of a clockwise or counterclockwise direction.
The nozzle attachment for an adjacent spray gun is formed in the same manner except the angle of the air jet bores is formed 10°. in the opposite direction from that of the air jet bores in the first nozzle attachment. In other words, if two adjacent nozzle attachments were placed one on top of the other so that their throughbores align, and the center of each bore at the top surface of nozzle attachments align, the angle between the longitudinal axis of the

air jet bores of one nozzle attachment would be spaced 20° from the longitudinal axis of the air jet bores in the adjacent nozzle attachment. The air jets from the air jet bores of such adjacent nozzle attachment therefore impact the outer periphery of the adhesive bead in the opposite direction to impart a rotation to such adhesive bead in the other of a clockwise or counterclockwise direction.
Detailed Description of the Drawings
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 an elevational view of one spray gun and the manifold to which it is mounted;
Fig. 2 is a partial side view taken gener¬ ally along line 2-2 of Fig. 1 showing the lower portion of two spray guns in the apparatus of this invention mounted side-by-side;
Fig. 3 is a top plan view of the nozzle attachments shown in Fig. 2.
Detailed Description of the Invention
Referring now to Figs. 1 and 2, an adhesive spray apparatus 10 is illustrated which comprises a

pair of adhesive spray guns 12, 12a having nozzles 14 and 16 connected at one end. The spray guns 12, 12a are mounted to an adhesive manifold 18 by screws 20. The adhesive manifold 18 is formed with an adhesive supply passageway 22 and an air supply passageway 24 which communicate with each of the spray guns 12, 12a. The spray guns 12, 12a are operated by pressurized air from the air supply passageway 24 to discharge hot melt adhesive provided by the adhesive supply passage¬ way 22 through the nozzles 14 and 16. The detailed structure of spray guns 12, 12a and adhesive manifold 18 are substantially identical to that illustrated in U.S. Patent No. 3,690,518, owned by the assignee of this invention, and form no part of this invention per se. Reference to such ‘518 patent should be made for a detailed discussion of the operation of spray guns 12, 12a and adhesive manifold 18.
The nozzles 14, 16 of each spray gun 12, 12a are formed with an adhesive passageway 26 which communicates with the adhesive supply passageway 22 and terminates at an adhesive discharge opening 28. An air delivery passageway 30 is also formed in each nozzle 14, 16 which terminates at an annular chamber 32 in the base of the nozzle. The air delivery passageway 30 is supplied with pressurized air through an air inlet line 34 formed in an air manifold 36 connected to the adhesive manifold 18 by screws 38.

In the presently preferred embodiment, the nozzle 14, 16 of each spray gun 12, 12a is formed with a reduced diameter portion having external threads 40 which mate with internal threads formed in a cap 42. As described below, one cap 42 mounts a first nozzle attachment 44 to spray nozzle 14 and another cap 42 mounts a second nozzle attachment 46 to the spray nozzle 16.
Referring now to the bottom of Figs. 2 and 3, each of the nozzle attachments 44, 46 are shown in detail. The structure of such nozzle attachments 44, 46 is discussed in detail in co-pending patent appli¬ cation Serial No. 041,712, filed April 23, 1987 and owned by the same assignee as this invention, “which is incorporated by reference in its entirety herein. For purposes of the present discussion, the nozzle attach¬ ments 44, 46 are described briefly and structure common to both attachments 4 , 46 is given the same reference numbers.
The nozzle attachment 44 comprises an annular plate having one side formed with a first or upper surface 48 and an opposite side formed with a second or lower surface 50 spaced from the upper surface 48. A boss 52 extends outwardly from the upper surface 48 and a nozzle tip 54 extends outwardly from the lower surface 50 in alignment with the boss

52. A throughbore 56 is formed in the nozzle attach¬ ment between the boss 52 and nozzle tip 54.
An annular V-shaped groove 58 is formed in the nozzle attachment which extends inwardly from its upper surface 48 toward the lower surface 50. The annular groove 58 defines a pair of sidewalls 60, 62 which are substantially perpendicular to one another. In the presently preferred embodiment, the sidewall 62 is formed at approximately a 30° angle with respect to the planar upper surface 48 of the nozzle attachment. As best illustrated in Fig. 3, six air jet bores 64 are formed in a nozzle attachment of spray gun each having an inlet at the annular groove 58 and an outlet at the lower surface 50. Preferably, the air jet bores 64 extend at an angle of approximately 30° with respect to the longitudinal axis of the throughbore 56. As discussed in detail in the co-pending appli¬ cation Serial No. 041,712, mentioned above, the annular groove 58 facilitates drilling of the air jet bores 64 to ensure they are accurately positioned.
The longitudinal axis of each of the air jet’ bores 64 of first nozzle attachment 44 is angled approximately 10° in a counterclockwise direction as viewed in Fig. 3 with respect to a vertical plane passing through the longitudinal axis 66 of through¬ bore 56 and the center of the inlet of each such air jet bore 64 at the annular groove 58. For example,

the longitudinal axis 68 of air jet bore 64a is angled approximately 10° relative to a vertical plane passing through the longitudinal axis 66 of throughbore 56 and the centerpoint 70 of the inlet of bore 64a at the annular groove 58 in nozzle attachment 44. As a result, a jet of pressurized air 72 ejected from the outlet of air jet bore 64a is directed substantially tangent to the outer periphery of the throughbore 56 and the adhesive bead ejected therefrom, as described in more detail below.
The second nozzle attachment 46 mounted to the spray gun 14 is identical to first nozzle attach¬ ment 44 except for the angular orientation of the six air jet bores 74 formed therein which correspond to the air jet bores 64 of the first nozzle attachment 44. Air jet bores 74 are angled at approximately 10° in a clockwise direction as viewed in Fig. 3 with respect to a vertical plane passing through the longitudinal axis of the throughbore 56 and the center of the inlet of each such bore 74 at the annular groove 58. For example, the longitudinal axis 76 of air jet bore 74a is angled approximately 10° in a clockwise direction relative to a vertical plane passing through the longitudinal axis 66 of through¬ bore 56 -and the centerpoint 78 of the inlet of air jet
« bore 74a at the annular groove 58 in nozzle attachment 46.

The angular orientation of the air jet bores 74 of second nozzle attachment 46 relative to the throughbore 56 is essentially the mirror image of the position of air jet bores 64 of the first nozzle attachment 44. In other words, if the first nozzle attachment 44 was placed atop the second nozzle attachment 46 such that their throughbores 56 align, and the centerpoint 70 of air jet bore 64a aligned with the centerpoint 78 of air jet bore 74a, the longitudinal axis of each air jet bores 64 would be spaced 20° from the longitudinal axis of each corre¬ sponding air jet bore 74.
Both the first and second nozzle attachments 44, 46 rest upon an annular seat 80 formed in the caps 42. The cap 42 is threaded onto the lowermost end of nozzles 14, 16 so that the boss 52 on the upper surface 48 of nozzle attachments 44, 46 extends within a seat or recess 82 formed in the base of nozzles 14 and 16 at the adhesive discharge opening 28 of adhe¬ sive passageway 26.
The operation of the spray apparatus 10 of this invention is as follows. Heated hot melt adhe¬ sive is introduced through the adhesive supply pas¬ sageway 22 into each of the spray guns 12, 12a where it flows through the adhesive passageway 26 to the adhesive discharge opening 28 in the nozzles 14 and 16. Each of the spray guns 12, 12a is air-operated to

open and close the flow of adhesive through the adhesive discharge opening 28. From the nozzles 14 and 16, the heated hot melt adhesive is transferred into the throughbore 56 of each nozzle attachment 44, – 46 and then discharged through the nozzle tips 54 thereof to form first and second adhesive beads 84, 86, respectively. At the same time the adhesive beads 84, 86 are formed and ejected from the nozzle attach¬ ments 44, 46, pressurized air is directed through the air supply passageway 34, through the air delivery passageway 30 in nozzles 14 and 16 and then to the annular chamber 32 in the nozzles 14, 16 of each spray gun 12, 12a, which communicate with the air jet bores 64 and 74, respectively.
As best shown in Fig. 3, the air jet bores 64 of first nozzle attachment 44 are angled relative to the longitudinal axis of the throughbore 56 so that the jets of air flowing therethrough impact the first adhesive bead 84 substantially tangent to its outer periphery at a point spaced below the nozzle tip 54. The air ejected from the air jet bore 64 performs two functions. First, the jets of air attenuate or stretch the first adhesive bead 84 forming elongated strands or fibers of hot melt adhesive for deposit onto a substrate 88. Additionally, the tangential impact of the air jet streams from the six bores 64 imparts a clockwise rotation or twisting motion to the

elongated fibers forming them in a compact spiral pattern for deposition onto the substrate 88.
The same spiral spray pattern of adhesive fibers is obtained from the nozzle 16 of spray gun 14 in the same manner as in the nozzle 14, except the direction of rotation of the elongated adhesive fibers is counterclockwise in the illustration of Fig. 3. In second nozzle attachment 46, the air jet bores 74 are angled relative to the longitudinal axis of the throughbore 56 so that the jets of air flowing there¬ through impact the outer periphery of the second adhesive, bead 86 in the opposite direction such that the elongated fibers of hot melt adhesive are rotated or twisted in the counterclockwise direction instead of a clockwise direction.
The counter-rotating spiral spray patterns from spray nozzles 14 and 16 contact one another at or near the top surface of the substrate 88. Because the two spray patterns are rotating in opposite direc¬ tions, they do not interfere with one another upon impact and thus produce little or no turbulence or eddies which can disrupt the spray pattern, produce an uneven application of adhesive onto the substrate and/or force some of the elongated fibers upstream toward the spray guns 12, 12a.
While the invention has been described with reference to a preferred embodiment, it will be

understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of this invention. In addition, many modifications may be made to adapt a particular situation or mater¬ ial to the teachings of the invention without depart¬ ing from the essential scope thereof.
For example, only two spray guns 12, 12a were illustrated in the Figs. It should be understood that the spray apparatus 10 could be formed with essentially any number of spray guns 12, 12a mounted side-by-side to a manifold 18 depending upon the width of the spray pattern desired. In such instance, the direction of rotation of adjacent spiral spray’ pat¬ terns would be opposite so as to avoid interference therebetween in accordance with the teachings of this inventio .
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 (8)

What is claimed is:

1. Apparatus for spraying hot melt adhesive comprising: a manifold formed with an adhesive supply passageway connected to a source of heated hot melt adhesive, and formed with an air supply passageway connected to a source of pressurized air; first and second dispensing devices mounted side-by-side to said manifold, said first and second dispensing devices each having a spray nozzle formed with an adhesive discharge passageway communicating with said adhesive supply passageway, said adhesive discharge passageways of said first and second dis¬ pensing devices ejecting first and second beads of heated hot melt adhesive, respectively, each having an outer periphery; said spray nozzle of said first dispensing device having a plurality of first air discharge passageways communicating with said air supply pas¬ sageway, said first air discharge passageways being formed at an angle with respect to said adhesive discharge passageway of said first dispensing device to direct pressurized air substantially tangent to said outer periphery of said first adhesive bead ejected from said adhesive discharge passageway of said first dispensing device, the pressurized air from said first air discharge passageways being effective to form said first adhesive bead into elongated adhesive fibers and to impart a twisting motion to said elongated adhesive fibers in one of a clockwise or counterclockwise direction to form a spiral spray pattern of elongated adhesive fibers; said spray nozzle of said second dispensing device being formed with a plurality of second air discharge passageways communicating with said air supply passageway, said second air discharge passage¬ ways being formed at an angle with respect to said adhesive discharge passageway of said second dispens¬ ing device to direct pressurized air substantially tangent to said outer- periphery of said second adhe¬ sive bead ejected from said adhesive discharge pas¬ sageway of said second dispensing device, the pres¬ surized air from said second air discharge passageways being effective to form said second adhesive bead into elongated adhesive fibers and to impart a twisting motion to said elongated adhesive fibers in the other of said clockwise and counterclockwise directions to form a spiral spray pattern of elongated adhesive fibers.

2. The apparatus of claim 1 in which each of said first air discharge passageways is formed with an inlet, an outlet and a longitudinal axis extending between the centerpoint of said inlet and outlet, said first air discharge passageways of said first dis¬ pensing device being disposed at an angle of approxi¬ mately 10° relative to a vertical plane passing through the longitudinal axis of said adhesive dis¬ charge passageway and said centerpoint of said inlet of each said first air discharge passageways, said angle being such that pressurized air ejected from each said first air discharge passageways contacts said periphery of said first adhesive bead ejected from said adhesive discharge passageway of said first dispensing device to rotate said first adhesive bead in a clockwise direction.

3. The apparatus of claim 1 in which each of said second air discharge passageways is formed with an inlet, an outlet and a longitudinal axis extending between the centerpoint of said inlet and outlet, said second air discharge passageways of said second dispensing device being disposed at an angle of approximately 10° relative to a vertical plane passing through the longitudinal axis of said adhesive dis¬ charge passageway and said centerpoint of said inlet of each said second air discharge passageways, said angle being such that pressurized air ejected from each said second air discharge passageways contacts said periphery of said second adhesive bead ejected from said adhesive discharge passageway of said second dispensing device to rotate said second adhesive bead in a counterclockwise direction.

4. Apparatus for spraying heated hot melt adhe¬ sive comprising: means for ejecting a first heated hot melt adhesive bead from the adhesive discharge passageway of a first dispensing device; means for impacting the outer periphery of said first adhesive bead from said first dispensing device with jets of air ejected from air discharge passageways in said first dispensing device to form said first adhesive bead into elongated adhesive fibers and to impart a clockwise twisting motion to said elongated adhesive fibers forming a first spiral spray pattern; means for ejecting a second heated hot melt adhesive bead from the adhesive discharge passageway of a second dispensing device positioned beside said first dispensing device; and means for impacting the outer periphery of said second adhesive bead from said second dispensing device with jets of air ejected from air discharge passageways in said second dispensing device to form said second adhesive bead into elongated adhesive fibers and to impart a counterclockwise twisting motion to said elongated- adhesive fibers forming a second spiral spray pattern.

5. Apparatus for spraying molten thermoplastic material, comprising: means for ejecting a first heated hot melt adhesive bead from the adhesive discharge passageway of a first dispensing device; means for impacting the outer periphery of said first adhesive bead from said first dispensing device with jets of air ejected from air discharge passageways in said first dispensing device to form said first adhesive bead into elongated adhesive fibers and to impart a clockwise twisting motion to said elongated adhesive fibers forming a first spiral spray pattern; means for ejecting a second heated hot melt adhesive bead from the adhesive discharge passageway of a second dispensing device positioned beside said first dispensing device; and means for impacting the outer periphery of said second adhesive bead from said second dispensing device with jets of air ejected from air discharge passageways in said second dispensing device to form said second adhesive bead into elongated adhesive fibers and to impart a counterclockwise twisting motion to said elongated adhesive fibers forming .a second spiral spray pattern.

6. A method of spraying heated hot melt adhe¬ sive comprising: ejecting a first heated hot melt adhesive bead from the adhesive discharge passageway of a first dispensing device; impacting the outer periphery of said first adhesive bead from said first dispensing device with jets of air ejected from air discharge passageways in said first dispensing device to form said first adhesive bead into elongated adhesive fibers and to impart a clockwise twisting motion to said elongated adhesive fibers forming a first spiral spray pattern; ejecting a second heated hot melt adhesive bead from the adhesive discharge passageway of a second dispensing device positioned beside said first dispensing device; impacting the outer periphery of said second adhesive bead from said second dispensing device with jets of air ejected from air discharge passageways in said second dispensing device to form said second adhesive bead into elongated adhesive fibers, and to impart a counterclockwise twisting motion to said elongated adhesive fibers forming a second spiral spray pattern.

7. The method of claim 1 further comprising the step of positioning said first and second dispensing devices so that said first and second spray patterns therefrom overlap to form a combined spray pattern having approximately twice the width of one of said first and second spray patterns.

8. A method of spraying molten thermoplastic material comprising: ejecting a first heated hot melt adhesive bead from the adhesive discharge passageway of a first dispensing device; impacting the outer periphery of said first adhesive bead from said first dispensing device with jets of air ejected from air discharge passageways in said first dispensing device to form said first adhesive bead into elongated adhesive fibers and to impart a clockwise twisting motion to said elongated adhesive fibers forming a first spiral spray pattern; ejecting a second heated hot melt adhesive bead from the. adhesive discharge passageway of a second dispensing device positioned beside said first dispensing device; impacting the outer periphery of said second adhesive bead from said second dispensing device with jets of air ejected from air discharge passageways in said second dispensing device to form said second adhesive bead into elongated adhesive fibers and to impart a counterclockwise twisting motion to said, elongated adhesive fibers forming a second spiral spray pattern.

AU17196/88A
1987-06-16
1988-05-06
Method and apparatus for spraying hot melt adhesive elongatedfibers in spiral patterns by two or more side-by-side spray devices

Ceased

AU598993B2
(en)

Applications Claiming Priority (2)

Application Number
Priority Date
Filing Date
Title

US062702

1987-06-16

US07/062,702

US4815660A
(en)

1987-06-16
1987-06-16
Method and apparatus for spraying hot melt adhesive elongated fibers in spiral patterns by two or more side-by-side spray devices

Publications (2)

Publication Number
Publication Date

AU1719688A
true

AU1719688A
(en)

1989-01-19

AU598993B2

AU598993B2
(en)

1990-07-05

Family
ID=22044249
Family Applications (1)

Application Number
Title
Priority Date
Filing Date

AU17196/88A
Ceased

AU598993B2
(en)

1987-06-16
1988-05-06
Method and apparatus for spraying hot melt adhesive elongatedfibers in spiral patterns by two or more side-by-side spray devices

Country Status (7)

Country
Link

US
(1)

US4815660A
(en)

EP
(1)

EP0363387A1
(en)

JP
(1)

JPH07114992B2
(en)

AU
(1)

AU598993B2
(en)

BR
(1)

BR8807537A
(en)

CA
(1)

CA1259526A
(en)

WO
(1)

WO1988010154A1
(en)

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1992-08-17
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Nordson Corporation
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1992-12-16
1994-06-17
Robert L. Popp
Apparatus and methods for selectively controlling a spray of liquid to form a distinct pattern

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1993-01-25
1993-11-30
Nordson Corporation
Adhesive spray gun with adjustable module and method of assembling

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1993-04-26
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Nordson Corporation
Segmented die for applying hot melt adhesives or other polymer melts

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1998-04-17
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Nordson Corporation
Method and apparatus for applying a controlled pattern of fibrous material to a moving substrate

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1998-04-20
2001-10-02
Nordson Corporation
Segmented metering die for hot melt adhesives or other polymer melts

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1998-04-20
2002-07-23
Nordson Corporation
Segmented applicator for hot melt adhesives or other thermoplastic materials

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1998-10-01
2002-05-07
The University Of Akron
Process and apparatus for the production of nanofibers

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1998-10-07
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Lucio Vaccani

MACHINE FOR THE APPLICATION OF GLUE IN PRESTABILITE AREAS GENERALLY PRODUCED.

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2000-05-15
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Nordson Corporation
Module and nozzle for dispensing controlled patterns of liquid material

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Adhesive applicator apparatus

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The University Of Akron
Process and apparatus for the production of nanofibers

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Cloth-like laminate and absorbent garment

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Paragon Trade Brands, Inc.
Elastic strand coating process

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2002-01-22
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The University Of Akron
Process and apparatus for the production of nanofibers

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2002-01-28
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Nordson Corporation
Compact heated air manifolds for adhesive application

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2002-04-12
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Nordson Corporation
Applicator and nozzle for dispensing controlled patterns of liquid material

US20050001869A1
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2003-05-23
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Viscous material noncontact jetting system

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Kimberly-Clark Worldwide, Inc.
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Producing an ivy leaf extract containing hederacoside C and alpha-hederin, useful for treating respiratory diseases comprises steaming comminuted ivy leaves before extraction

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Hot melt adhesive

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Nordson Corporation
System for jetting phosphor for optical displays

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Meler Aplicadores De Hot-Melt, S.A.

PISTOL WITH ROTATING NOZZLE FOR APPLICATION OF THERMOUSABLE PRODUCTS

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Nordson Corporation
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LIQUID DISPENSER WITH INDIVIDUALIZED PROCESS AIR CONTROL

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Nordson Corporation
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1987

1987-06-16
US
US07/062,702
patent/US4815660A/en
not_active
Expired – Lifetime

1988

1988-02-12
CA
CA000558809A
patent/CA1259526A/en
not_active
Expired

1988-05-06
AU
AU17196/88A
patent/AU598993B2/en
not_active
Ceased

1988-05-06
EP
EP88904374A
patent/EP0363387A1/en
not_active
Withdrawn

1988-05-06
BR
BR888807537A
patent/BR8807537A/en
unknown

1988-05-06
JP
JP63504183A
patent/JPH07114992B2/en
not_active
Expired – Fee Related

1988-05-06
WO
PCT/US1988/001484
patent/WO1988010154A1/en
not_active
Application Discontinuation

Also Published As

Publication number
Publication date

JPH07114992B2
(en)

1995-12-13

BR8807537A
(en)

1990-03-27

JPH02503762A
(en)

1990-11-08

EP0363387A1
(en)

1990-04-18

AU598993B2
(en)

1990-07-05

CA1259526A
(en)

1989-09-19

WO1988010154A1
(en)

1988-12-29

US4815660A
(en)

1989-03-28

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