EP0081014A1 - Druckzerstäubervorrichtung - Google Patents

Druckzerstäubervorrichtung Download PDF

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Publication number
EP0081014A1
EP0081014A1 EP81305749A EP81305749A EP0081014A1 EP 0081014 A1 EP0081014 A1 EP 0081014A1 EP 81305749 A EP81305749 A EP 81305749A EP 81305749 A EP81305749 A EP 81305749A EP 0081014 A1 EP0081014 A1 EP 0081014A1
Authority
EP
European Patent Office
Prior art keywords
piston
product
valve
skirt
axial ribs
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP81305749A
Other languages
English (en)
French (fr)
Inventor
Floyd R. French
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.)
Clayton Corp
Original Assignee
Clayton Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Clayton Corp filed Critical Clayton Corp
Priority to EP81305749A priority Critical patent/EP0081014A1/de
Publication of EP0081014A1 publication Critical patent/EP0081014A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D83/00—Containers or packages with special means for dispensing contents
    • B65D83/14—Containers for dispensing liquid or semi-liquid contents by internal gaseous pressure, i.e. aerosol containers comprising propellant
    • B65D83/60—Containers for dispensing liquid or semi-liquid contents by internal gaseous pressure, i.e. aerosol containers comprising propellant with contents and propellant separated
    • B65D83/64—Containers for dispensing liquid or semi-liquid contents by internal gaseous pressure, i.e. aerosol containers comprising propellant with contents and propellant separated by pistons

Definitions

  • This invention relates to pressurised dispensing apparatus.
  • Aerosol or pressurised cans from which a product can be dispersed under pressure on opening a valve, are widely used.
  • One known type'of dispenser is the piston can.
  • the piston can is usually used when the product has a viscosity such that it is difficult to atomise. Examples of such products are caulking materials and shaving cream.
  • a typical piston can comprises a cylindrical metal container capped with a valve, and contains a plastic cup or piston, dispensible material, and gas under pressure.
  • the product rests on the piston, and the piston is supported by the gas.
  • the valve When the valve is opened, the pressure exerted by the gas from the piston forces the piston and product towards, and the product through, the open valve.
  • the effectiveness of a piston can is suitably measured by the amount of product which cannot be expelled from the can, i.e. the product remaining when opening of the valve no longer causes product expulsion. This point is reached when the piston comes as close as the design of can allows to the valve, or when most of the gas has escaped through the valve.
  • the gas must not escape around the skirt of the piston (in addition to reducing delivery effectiveness, gas escape can. also contaminate the product).
  • product must be prevented from adhering to the side walls of the can, as the piston is forced towards the valve.
  • the product must be prevented from passing the piston, into the volume of the can occupied by the gas.
  • a simple piston can is disclosed in US Patent Specification No. 3,132,570.
  • the illustrated piston has a slightly flared skirt, with internal axial ribs.
  • the flare allows product to accumulate between the piston and the can wall. Should the product not draw evenly from the can as the piston is propelled by the gas, the piston is liable to wobble. Wobbling increases the amount of product adhering to the wall. The result is a tendency for the piston to become skewed and/or lodged against the can wall, impeding product flow.
  • US Patent Specification No. 3,255,936 discloses a flanged piston, for use in a piston can.
  • US Patent Specification No. 3,381,863 discloses a piston having a generally frusto-conical shape.
  • the base of the piston is formed as a seal with the wall of the can.
  • the piston also includes a relatively flexible flange which "wipes " the wall as the piston travels towards the valve. Perhaps owing to the fact that such a piston has two circumferential flanges in contact with the can wall, the piston can be stably mounted in the can.
  • US Patent Specification No. 4,023,717 discloses a piston whose generally right cylindrical skirt includes an intermediate section, around its circumference, which lightly contact the can wall or is expansible in the presence of loading pressure exerted by propellent gas.
  • a similar product is disclosed in US Patent Specification No. 4,106,674; the piston illustrated there additionally comprises a circumferentially continuous tail structure having axially extending ribs, in order to reinforce the piston member.
  • a piston of the type which can be used in pressurised cans comprises a top and a skirt, the skirt having at least three external axial ribs and, beneath the ribs, a circumferential rib or flange.
  • a piston can according to the invention comprises a valve and contains a piston as defined. The can may also comprise a dispensible product above, and a pressurised gas beneath, the piston.
  • a can for use in the invention can be of conventional design.
  • it may comprise a generally cylindrical body, a valve, and a bottom with a resilient plug.
  • the body can be seamed or seamless. It may be made of aluminium, metal or glass.
  • the valve may be, for example, a nozzle valve or a foam valve. The presence of a plug in the bottom will depend on the filling process but its presence is usually preferred, in view of the preferred filling process.
  • the preferred filling process is to introduce a product and the piston into the can.
  • a valve is then crimped to the top of the can.
  • a can bottom is already present or subsequently introduced, and the volume beneath the piston is pressurised by introducing gas into that volume through a hole in the can bottom which is then sealed by insertion of a resilient plug.
  • the can is then ready for use, by actuation,of the valve, in order to open it.
  • the pressurised gas forces the piston upwards.
  • the piston reaches the top of the can.
  • A.piston of the invention is preferably hollow.
  • the configuration of its top is not critical, but is preferably shaped to conform to the shape of the interior of the top of the can. This ensures that the piston can move as far as possible towards the valve and thereby cause the expulsion of as much product as possible from the can.
  • the piston further has a side wall or skirt whose exterior circumference generally corresponds to that of the interior of the can, i.e. it is usually right cylindrical.
  • the circumferential rib or flange is preferably located at the foot of the skirt,i.e. along the bottom edge of the piston side wall. This flange provides a seal between the product and the pressurised gas, in use.
  • the piston has, externally, axial ribs. There are preferably at least three evenly-spaced axial ribs. These ribs preferably extend from at or near the top of the piston side wall to the circumferential rib.
  • the axial ribs define a space between the piston side wall and the can wall. Product can flow into this space and form a product seal.
  • the ribs maintain the piston stably in the desired position coaxially with the can.
  • the combined sealing effect of the product and the circumferential flange is effective, and the flange prevents excessive use of the product'as a sealant and also serves to "wipe" the can walls.
  • the piston may be constructed of any suitable material, e.g. known plastics or light metals. The material used will be chosen having regard to the nature of the product to be dispensed and the pressurised gas. Suitable materials include terephthalates, ABS, acetals, acrylics, styrene-acrylonitrile, polyethylene, polypropylene and nylon.
  • a piston can of the invention can dispense a large proportion of a dispensible product therefrom.
  • the piston remains stable during dispensing, and only a minimal amount of the product is retained on the seal between the product and gas volumes of the can.
  • the piston is suitable for use in seamed and seamless cans.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
EP81305749A 1981-12-04 1981-12-04 Druckzerstäubervorrichtung Withdrawn EP0081014A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP81305749A EP0081014A1 (de) 1981-12-04 1981-12-04 Druckzerstäubervorrichtung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP81305749A EP0081014A1 (de) 1981-12-04 1981-12-04 Druckzerstäubervorrichtung

Publications (1)

Publication Number Publication Date
EP0081014A1 true EP0081014A1 (de) 1983-06-15

Family

ID=8188472

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81305749A Withdrawn EP0081014A1 (de) 1981-12-04 1981-12-04 Druckzerstäubervorrichtung

Country Status (1)

Country Link
EP (1) EP0081014A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0523606A1 (de) * 1991-07-17 1993-01-20 United States Can Company Aerosoldose mit fliegendem Kolben
US5301664A (en) * 1992-03-06 1994-04-12 Sievers Robert E Methods and apparatus for drug delivery using supercritical solutions
US5639441A (en) * 1992-03-06 1997-06-17 Board Of Regents Of University Of Colorado Methods for fine particle formation

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3099370A (en) * 1958-12-24 1963-07-30 American Can Co Dispensing container for viscous products
US3132570A (en) * 1960-10-18 1964-05-12 American Can Co Piston construction for an aerosol container
US3255936A (en) * 1964-01-03 1966-06-14 Colgate Palmolive Co Pressurized dispensing container
US3381863A (en) * 1966-05-23 1968-05-07 Edward J. Towns Separating medium for use in pressurized dispensing containers
US3915352A (en) * 1974-09-11 1975-10-28 Christian T Scheindel Aerosol can and piston assembly
US4023717A (en) * 1974-04-09 1977-05-17 Schultz Robert S Pressure-operated container for viscous products
US4169547A (en) * 1976-10-26 1979-10-02 Glaxo Laboratories Limited Ointment container with finger actuated piston
FR2432452A1 (fr) * 1978-08-01 1980-02-29 Schultz Robert Recipient sous pression pour produits visqueux

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3099370A (en) * 1958-12-24 1963-07-30 American Can Co Dispensing container for viscous products
US3132570A (en) * 1960-10-18 1964-05-12 American Can Co Piston construction for an aerosol container
US3255936A (en) * 1964-01-03 1966-06-14 Colgate Palmolive Co Pressurized dispensing container
US3381863A (en) * 1966-05-23 1968-05-07 Edward J. Towns Separating medium for use in pressurized dispensing containers
US4023717A (en) * 1974-04-09 1977-05-17 Schultz Robert S Pressure-operated container for viscous products
US3915352A (en) * 1974-09-11 1975-10-28 Christian T Scheindel Aerosol can and piston assembly
US4169547A (en) * 1976-10-26 1979-10-02 Glaxo Laboratories Limited Ointment container with finger actuated piston
FR2432452A1 (fr) * 1978-08-01 1980-02-29 Schultz Robert Recipient sous pression pour produits visqueux

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0523606A1 (de) * 1991-07-17 1993-01-20 United States Can Company Aerosoldose mit fliegendem Kolben
US5301664A (en) * 1992-03-06 1994-04-12 Sievers Robert E Methods and apparatus for drug delivery using supercritical solutions
US5639441A (en) * 1992-03-06 1997-06-17 Board Of Regents Of University Of Colorado Methods for fine particle formation
US6095134A (en) * 1992-03-06 2000-08-01 The Board Of Regents Of The University Of Co Methods and apparatus for fine particle formation

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE FR GB

17P Request for examination filed

Effective date: 19831014

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19850327

RIN1 Information on inventor provided before grant (corrected)

Inventor name: FRENCH, FLOYD R.