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WO2005097349A1 - Dispositif de generation de gouttelettes a meche compressible - Google Patents

Dispositif de generation de gouttelettes a meche compressible Download PDF

Info

Publication number
WO2005097349A1
WO2005097349A1 PCT/GB2005/001340 GB2005001340W WO2005097349A1 WO 2005097349 A1 WO2005097349 A1 WO 2005097349A1 GB 2005001340 W GB2005001340 W GB 2005001340W WO 2005097349 A1 WO2005097349 A1 WO 2005097349A1
Authority
WO
WIPO (PCT)
Prior art keywords
wick
fluid
section
generating device
droplet generating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/GB2005/001340
Other languages
English (en)
Inventor
Oliver Burstall
Andrew Sant
Christopher Smith
Chris Witty
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.)
Reckitt Benckiser UK Ltd
Original Assignee
Reckitt Benckiser UK Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Reckitt Benckiser UK Ltd filed Critical Reckitt Benckiser UK Ltd
Publication of WO2005097349A1 publication Critical patent/WO2005097349A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01M—CATCHING, TRAPPING OR SCARING OF ANIMALS; APPARATUS FOR THE DESTRUCTION OF NOXIOUS ANIMALS OR NOXIOUS PLANTS
    • A01M1/00—Stationary means for catching or killing insects
    • A01M1/20—Poisoning, narcotising, or burning insects
    • A01M1/2022—Poisoning or narcotising insects by vaporising an insecticide
    • A01M1/2027—Poisoning or narcotising insects by vaporising an insecticide without heating
    • A01M1/2044—Holders or dispensers for liquid insecticide, e.g. using wicks
    • A01M1/205—Holders or dispensers for liquid insecticide, e.g. using wicks using vibrations, e.g. ultrasonic or piezoelectric atomizers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B17/00—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups
    • B05B17/04—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods
    • B05B17/06—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations
    • B05B17/0607—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations generated by electrical means, e.g. piezoelectric transducers
    • B05B17/0638—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations generated by electrical means, e.g. piezoelectric transducers spray being produced by discharging the liquid or other fluent material through a plate comprising a plurality of orifices
    • B05B17/0646—Vibrating plates, i.e. plates being directly subjected to the vibrations, e.g. having a piezoelectric transducer attached thereto
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B17/00—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups
    • B05B17/04—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods
    • B05B17/06—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations
    • B05B17/0607—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations generated by electrical means, e.g. piezoelectric transducers
    • B05B17/0653—Details
    • B05B17/0676—Feeding means
    • B05B17/0684—Wicks or the like

Definitions

  • This invention relates to an electromechanical fluid delivery device, to a method of delivering a fluid electromechanically, and to a container for a fluid delivery device, in particular to a fluid droplet generating device.
  • Electromechanical devices such as piezo electric devices for emitting fragrances or for example insect inhibiting fluids are known, for example, in WO 00/5337 or WO 02/09888.
  • Those devices include a fluid reservoir into which projects a wick which transports fluid to a perforated plate.
  • a piezo electric crystal causes vibration of the perforated plate to cause liquid transferred to openings in the plate to be atomised and dispersed into a surrounding atmosphere. It has been found that such prior art devices have disadvantages in that if the wick contacts the perforated plate with too great a pressure then vibration caused by the piezo electric crystal is inhibited causing poor dispersion of the fluid. However, if contact pressure between the wick and the plate is too low, or there is no contact, then insufficient transport of the fluid to the perforated plate results.
  • a compliant wick has been found to be useful for short- term operation of these devices, because the wick conforms to the shape of the perforated plate and its position, thus ensuring good fluid contact.
  • a compliant wick tends to soften over time when exposed to fluids such as fragrance formulations and takes on a "set" or fixed shape no longer maintaining contact with the membrane. A compliant wick therefore loses the benefits of a compliant wick over time.
  • a rigid wick does not have the disadvantage of taking on a "set” , but the difficulty remains of ensuring that the tip of a rigid wick is aligned with the perforated plate in three dimensions, for repeatable contact.
  • a fluid droplet generating device comprises a container for a fluid, an electromechanical vibration section incorporating a perforated membrane, and a wick for supplying fluid from the container to the perforated membrane, the electromechanical vibration section being operable to form a plurality of droplets of the fluid for dispersal, wherein the wick comprises a lower section and an upper section, the upper section being compliant with respect to the lower section.
  • the lower section is preferably substantially rigid.
  • the upper section is preferably substantially compliant with respect to the perforated membrane, against which the upper section preferably abuts.
  • the upper section preferably assumes a shape of the perforated membrane against which it abuts .
  • the wick preferably extends from a base of the container to the perforated membrane.
  • the wick preferably exerts an upward force on the perforated membrane.
  • the device preferably incorporates a head section, which preferably incorporates biasing means, preferably operable to exert a downward force on the electromechanical vibration section. Said downward force preferably substantially balances the upward force on the perforated membrane .
  • the upper section of the wick is preferably narrower than the lower section.
  • the upper section of the wick may have an upper projection.
  • the upper section may incorporate a recess on an upper side thereof, preferably on the side abutting the perforated plate.
  • the lower section of the wick may be made of a rigid foam, which may be a polyethylene foam, which may be hard sintered polyethylene.
  • the upper section of the wick may be made of a foam, preferably an open-cell foam.
  • the upper section may be made of thermosetting plastics material, preferably from the amino-plastics group.
  • the fluid may be a fragrance fluid, or may be an insect inhibiting fluid.
  • the upper section of the wick may have a compressive stress at 10% strain approximately in the range 1 to 40 kPa, preferably in the range 4 to 20 kPa .
  • a container for a fluid droplet generating device incorporates a wick for supplying fluid from the container to a dispersal section of a fluid droplet generating device, wherein the wick comprises a lower section and an upper section, the upper section being compliant with respect to the lower section.
  • the upper section is more compliant than the lower section.
  • the dispersal section includes an electromechanical vibration section.
  • the invention extends to a method of dispersing a fluid with an electromechanical fluid droplet generating device comprising supplying a fluid to a perforated membrane of an electromechanical vibration section of the device from a container via a wick, which wick comprises an upper section and a lower section, wherein the upper section is compliant with respect to the lower section.
  • the invention extends to a bicomponent wick for an electromechanical fluid droplet generating device, the wick having an upper section that is compliant with respect to a lower section thereof.
  • compliant should also be taken to mean compressible, in that the upper section is compressible with respect to the lower section.
  • Figure 1 is a schematic side cross-sectional view of a prior art fragrance-containing receptacle having a piezo electric crystal and a perforated plate and a (schematic) dispersing head section;
  • Figure 2 is a schematic view of a first embodiment of fragrance emitting device having a container, perforated plate, and piezo electric crystal;
  • Figure 3 is a view of the perforated plate with the piezo electric crystal from above;
  • Figure 4 is a schematic side view of the perforated plate with the piezo electric crystal
  • Figure 5 is a table of results for the device of Figure 1;
  • Figure 6 is a table of results for the device of Figure 2.
  • Figures 7a to 7c show different potential shapes for an upper compliant section of a wick element of the device in Figure 2.
  • the fragrance dispersing device 10 comprises a container 12 filled with a fragrance fluid 14, which fluid is transported out of the container 12 by a wick 16.
  • the wick 16 contacts a perforated plate 18 which carries an annular piezo electric crystal 20 (see figure 3) and is used to cause the plate 18 to vibrate in the manner well known to persons skilled in the art.
  • a head section 22 is shown schematically in Figure 1.
  • the head section 22 incorporates a power supply to power the piezo electric crystal 20 and a dispersal section to allow emission of atomised fragrance from the perforated plate 18.
  • the head section 22 is typically secured to the lower section consisting of the container 12, fluid 14 and wick 16 by, for example, a bayonet or screw fitting.
  • the lower section consisting of the fluid filled container 12 and wick 16 may be sold as -a separate part, as a replacement for a spent container 12 for attachment to a head section 22.
  • the head section 22 is shown schematically as incorporating a spring bias which bears down on the piezo electric crystal 20 and perforated plate 18.
  • the spring mounted support was used in order to achieve the correct pressure and contact between the perforated plate 18 and the wick 16.
  • the pressure exerted depends on how tightly the head section 22 is screwed on to the lower section.
  • the device 10 shown in Figure 1 uses a wick 16 that is made of a hard sintered polyethylene, in this example manufactured by Porex Technologies GmbH (product code UHMW PE XM-0266) .
  • the material is chosen because it has a porosity enabling fluid to be carried by capillary action through the pores of the material from the container 12 up to the perforated plate 18. In this material the pore diameter is approximately 20 microns, density is 0.95 g/cm 3 , bulk density is 0.40 to 0.47 g/cm 3 , flash point is ca. 350°C.
  • Figure 2 shows a device 24 that is similar to that shown in Figure 1 and like reference numerals have been used for like parts.
  • the device in Figure 2 is sold and used in the same way as that in Figure 1.
  • the difference between the device 10 in Figure 1 and the amended device 24 as shown in Figure 2 is the use of a two-part wick 26 comprising a lower section 26b of hard sintered polyethylene, as used in the device described in relation to Figure 1, but with a capping portion 26a of a white melamine foam, sold as basotect or m-foam.
  • the hard sintered polyethylene section 26b is the same as that described in relation to Figure 1.
  • the melamine foam section 26a is a flexible open cell foam made from melamine resin, a thermoset plastic from the amino plastics group. The physical properties are as follows:
  • the melamine foam section 26a has considerably greater compressibility than that of the hard sintered polyethylene section 26b.
  • the use of the compressible upper section 26a has significant advantages in that it allows a greater take up of any tolerance mis-match when the wick 26a/b contacts the perforated plate 18. Also, excessive pressure from the wick on the perforated plate 18 is removed, because any excess force due to tolerance differences is absorbed by the compression of the melamine foam section 26a of the wick.
  • the two-part wick 26 chosen has advantages over a wick made completely of a highly compressible or compliant material, because it avoids the disadvantages of a fully compliant wick referred to above.
  • a wick having at least a portion thereof being substantially rigid is easier to place precisely, especially in confined areas, for example positioning the wick in the neck of a refill bottle. This will have particular manufacturing advantages.
  • the thin compliant layer 26a accommodates misalignment between the rigid lower section 26b and the perforated plate 18.
  • the layer 26a, which forms a fluid bridge between the lower rigid wick section 26b and the perforated plate 18, also provides a network of fibres along which fluid can flow from the rigid lower section 26b to the perforated plate 18.
  • Figure 6 shows a bar chart of results from a number of devices constructed as shown in Figure 2 and described in relation thereto. As can be seen from the results which show device number and weight loss, in the same way as Figure 5, the results are significantly improved, with greater consistency of output.
  • the significant improvement is due to the compliance of the melamine foam section 26a of the wick. It is also the case that the melamine foam section 26a does not cause excessive damping of the perforated plate 18 due to its compliant nature.
  • the device 24 is driven so that the piezo electric crystal 20 is powered approximately every 50 seconds for a period of approximately 175 millseconds to achieve an emission of approximately 200 ⁇ g.
  • the period between the pulsations of the piezo electric crystal 20 causing vibration of the perforated plate 18 allows fluid 14 to be taken up the wick 26 to fill the perforations in the perforated plate 18, effectively charging the perforated plate 18 for dispersal of the fluid 14.
  • vibration of the perforated plate 18 recommences after 50 seconds the perforations have already been filled with fluid 14 so the fluid can be emitted into the atmosphere in a plume. In this way an emission/filling cycle is performed.
  • the device 24 described in relation to Figure 2 has significant advantages over the prior art devices in that there is much greater consistency of flow rate achieved for the devices bearing in mind the manufacturing tolerances readily achievable.
  • the provision of the two-part wick 26 provides good longevity due to the hard sintered polyethylene part 26b and good pressure balance on the perforated plate 18 with the melamine foam section 26a.
  • the relative height proportions of the melamine foam section 26a to the harder less compressible section 26b is approximately in the range 10cm: 1cm to 20cm: 1cm. In effect the melamine foam section 26a forms a soft cap to allow for take up of tolerance differences.
  • the perforations in the perforated section 18 have a diameter of approximately 5 ⁇ m.
  • the area of perforations in Figure 3 is approximately 4mm across, giving approximately 100-200 holes.
  • Figures 7a 7b and 7c show three different variations on the shape of the section 26a.
  • the compliant section is a disc, as shown in Figure 2.
  • the compliant section 26a has an upper narrow drum-shaped section 30 and a lower disc-shaped section 32. It has been found that this shape has advantageous properties in relation to an initial emission of fluid 14 after charging of the compliant section 26a.
  • the disc of Figure 7a occasionally splutters unless the compliant layer 26a is charged, for example by inverting the device.
  • the compliant section 26a has a disc shape with a central circular incision 34.
  • the upper part in each of the designs in Figures 7a-7c contacts the perforated plate 18 and the lower face contacts the hard sintered part 26b of the wick.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Pest Control & Pesticides (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Engineering & Computer Science (AREA)
  • Insects & Arthropods (AREA)
  • Wood Science & Technology (AREA)
  • Zoology (AREA)
  • Environmental Sciences (AREA)
  • Catching Or Destruction (AREA)
  • Disinfection, Sterilisation Or Deodorisation Of Air (AREA)

Abstract

L'invention concerne un dispositif de génération de gouttelettes de fluide (24) comprenant un contenant (12) pour un fluide (14), une section de vibration électromécanique (18, 20) qui comporte une membrane perforée (18), et une mèche (26a/b) pour acheminer le fluide (14) contenu dans le contenant (12) jusqu'à la membrane perforée (18). Selon l'invention, la section de vibration électromécanique peut fonctionner de manière à former une pluralité de gouttelettes de fluide (14) à des fins de dispersion. En outre, la mèche (26a,6) comprend une section inférieure (26b) et une section supérieure (26a), la section supérieure (26a) pouvant être adaptée à la section inférieure (26b).
PCT/GB2005/001340 2004-04-07 2005-04-06 Dispositif de generation de gouttelettes a meche compressible Ceased WO2005097349A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0407910A GB2412871A (en) 2004-04-07 2004-04-07 Piezoelectric device for emitting fragrances or insecticides
GB0407910.9 2004-04-07

Publications (1)

Publication Number Publication Date
WO2005097349A1 true WO2005097349A1 (fr) 2005-10-20

Family

ID=32320515

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2005/001340 Ceased WO2005097349A1 (fr) 2004-04-07 2005-04-06 Dispositif de generation de gouttelettes a meche compressible

Country Status (2)

Country Link
GB (1) GB2412871A (fr)
WO (1) WO2005097349A1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1792662A1 (fr) 2005-11-30 2007-06-06 Microflow Engineering SA Appareil de distribution de gouttelettes
WO2009001319A1 (fr) * 2007-06-26 2008-12-31 The Procter & Gamble Company Dispositif de dispersion de matériaux actifs liquides sous une forme particulaire comprenant un conducteur de liquide fritté
US7950595B2 (en) 2007-07-03 2011-05-31 Ep Systems Sa Wicking apparatus for liquid droplet spray device
US8328115B2 (en) 2007-07-03 2012-12-11 Ep Systems Sa Wicking apparatus for liquid droplet spray device
US8870090B2 (en) 2007-02-01 2014-10-28 Aptar France Sas Volatile liquid droplet dispenser device
US9010657B2 (en) 2008-06-03 2015-04-21 Aptar France Sas Volatile liquid droplet dispenser device
US10675373B2 (en) 2016-07-27 2020-06-09 Newmarket Concepts, Llc Fragrance dispenser having a disposable piezoelectric cartridge with a snap-in bottle containing aromatic liquid
WO2021116230A1 (fr) 2019-12-10 2021-06-17 Zobele Holding Spa Dispositif de diffusion de substances volatiles
CN114828625A (zh) * 2019-09-23 2022-07-29 S·C·庄臣父子公司 挥发性物质分配器

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0810667D0 (en) 2008-06-11 2008-07-16 The Technology Partnership Plc Fluid feed system improvments
GB0810668D0 (en) 2008-06-11 2008-07-16 The Technology Partnership Plc Fluid feed system improvements
FR2933319B1 (fr) * 2008-07-02 2010-08-13 Oreal Atomiseur piezoelectrique comprenant une composition liquide parfumante ; procede de parfumage

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5518179A (en) * 1991-12-04 1996-05-21 The Technology Partnership Limited Fluid droplets production apparatus and method
WO2000005337A1 (fr) 1998-07-24 2000-02-03 Biosynthesis Limited Cuve
WO2002009888A1 (fr) 2000-07-31 2002-02-07 S.C. Johnson & Son, Inc. Procede et appareil de distribution de liquides en aerosol a debordement minimum
US6446880B1 (en) * 2000-08-02 2002-09-10 S.C. Johnson & Son, Inc. Replaceable reservoir for an atomizing apparatus
US20030000520A1 (en) * 1995-04-05 2003-01-02 Aerogen, Inc. Liquid dispensing apparatus and methods
WO2003068412A1 (fr) * 2002-02-11 2003-08-21 Sara Lee/De N.V. Tete de pulverisation de liquide, appareil equipe de cette tete et contenant associe
US20030218077A1 (en) * 2002-05-24 2003-11-27 Boticki John A. Low leakage liquid atomization device
US20040200907A1 (en) * 2003-04-14 2004-10-14 Martens Edward J. Atomizer wicking system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW384207B (en) * 1997-08-20 2000-03-11 Fumakilla Ltd Piezoelectric chemical-liquid atomizer apparatus and method for repelling or eliminating harmful organism

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5518179A (en) * 1991-12-04 1996-05-21 The Technology Partnership Limited Fluid droplets production apparatus and method
US20030000520A1 (en) * 1995-04-05 2003-01-02 Aerogen, Inc. Liquid dispensing apparatus and methods
WO2000005337A1 (fr) 1998-07-24 2000-02-03 Biosynthesis Limited Cuve
WO2002009888A1 (fr) 2000-07-31 2002-02-07 S.C. Johnson & Son, Inc. Procede et appareil de distribution de liquides en aerosol a debordement minimum
US6446880B1 (en) * 2000-08-02 2002-09-10 S.C. Johnson & Son, Inc. Replaceable reservoir for an atomizing apparatus
WO2003068412A1 (fr) * 2002-02-11 2003-08-21 Sara Lee/De N.V. Tete de pulverisation de liquide, appareil equipe de cette tete et contenant associe
US20030218077A1 (en) * 2002-05-24 2003-11-27 Boticki John A. Low leakage liquid atomization device
US20040200907A1 (en) * 2003-04-14 2004-10-14 Martens Edward J. Atomizer wicking system

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1792662A1 (fr) 2005-11-30 2007-06-06 Microflow Engineering SA Appareil de distribution de gouttelettes
US9604242B2 (en) 2005-11-30 2017-03-28 Aptar France Sas Volatile liquid droplet dispenser device
US8870090B2 (en) 2007-02-01 2014-10-28 Aptar France Sas Volatile liquid droplet dispenser device
WO2009001319A1 (fr) * 2007-06-26 2008-12-31 The Procter & Gamble Company Dispositif de dispersion de matériaux actifs liquides sous une forme particulaire comprenant un conducteur de liquide fritté
US7950595B2 (en) 2007-07-03 2011-05-31 Ep Systems Sa Wicking apparatus for liquid droplet spray device
US8328115B2 (en) 2007-07-03 2012-12-11 Ep Systems Sa Wicking apparatus for liquid droplet spray device
US9010657B2 (en) 2008-06-03 2015-04-21 Aptar France Sas Volatile liquid droplet dispenser device
US10675373B2 (en) 2016-07-27 2020-06-09 Newmarket Concepts, Llc Fragrance dispenser having a disposable piezoelectric cartridge with a snap-in bottle containing aromatic liquid
CN114828625A (zh) * 2019-09-23 2022-07-29 S·C·庄臣父子公司 挥发性物质分配器
CN114828625B (zh) * 2019-09-23 2023-11-21 S·C·庄臣父子公司 挥发性物质分配器
WO2021116230A1 (fr) 2019-12-10 2021-06-17 Zobele Holding Spa Dispositif de diffusion de substances volatiles
US12447495B2 (en) 2019-12-10 2025-10-21 Zobele Holding Spa Device for diffusing volatile substances

Also Published As

Publication number Publication date
GB2412871A (en) 2005-10-12
GB0407910D0 (en) 2004-05-12

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