Dispensing – With discharge assistant – Fluid pressure
Patent
1998-05-18
2000-10-10
Kaufman, Joseph A.
Dispensing
With discharge assistant
Fluid pressure
2224021, 22240225, 222635, B65D 8300
Patent
active
061292478
DESCRIPTION:
BRIEF SUMMARY
The invention relates to pressurized dispensing containers with an improved seal arrangement.
BACKGROUND ART
Pressurized dispensing containers are used for dispensing a wide variety of products from mobile to viscous liquid products, powdered products and the like and typically employ a liquid propellant such as a hydrocarbon or fluocarbon having sufficiently high vapor pressure at normal working temperatures to propel the product through the dispensing apparatus. These are commonly used for dispensing pharmaceuticals and medicaments.
Generally such pressurized dispensing containers comprise a container, a dispensing valve and a closure which is crimped to the container to hold the valve in place. A seal, usually made of an elastomeric material, is compressed between the container and the closure to prevent leakage. The efficiency of the sealing arrangement is particularly important to prevent the leakage of propellants. It is important that leakage is minimized, despite the latest propellants being more environmentally friendly than predecessors, to prevent the loss of the container contents, ensuring that there are sufficient contents available after storage to meet the claims of the packaging and also to ensure that the ratio of propellant to product remains constant.
It has hitherto been a problem that the deformation of the seal during the crimping operation can lead to a reduction in the effectiveness of the seal. During the crimping operation, the seal may also be deformed in a manner which does not provide a true seal.
Also it has hitherto been a problem that the permeability of the seal material with respect to the propellants has led to loss of propellant during storage of the container and during the shelf-life of the product.
To overcome such problems it has been proposed to use two seals, both of which are sandwiched between the container and the closure. An example of such proposal is described in International patent specification WO94/25373 in which is disclosed a pressurized dispensing container comprising valve means, a valve body, an open ended container body, a closure, a first seal between the container body and the closure and a second seal between the valve body and the container, said seals being independent such that the second seal seals off the container body from the first seal.
It is an object of the present invention to provide a further improved sealing arrangement for pressurized dispensing containers.
SUMMARY OF THE INVENTION
According to the invention there is therefore provided pressurized dispensing apparatus comprising a container for product to be dispensed, valve means for controlling outflow of product from the container, said valve including a valve body located within the container, said container comprising an open ended container body and a closure fixedly attached to said container body for closing the open end thereof, said closure having an annular sidewall extending around at least an upper end of the container body, said apparatus further comprising a first seal located in sealing engagement between the container body and the closure and a second seal located in sealing engagement between the valve body and the container, the first and second seals comprising independent seal members positioned such that the second seal seals off the container body from the first seal, characterized in that the first seal is also in sealing engagement with the valve body.
BRIEF DESCRIPTION OF THE DRAWINGS
A preferred embodiment of the present invention will now be described, by way of example only, with reference to the accompanying drawings in which FIGS. 1 and 2 illustrate a metering valve known in the prior art for use in a pressurizing dispensing container incorporating alternative seal arrangements according to the present invention.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT
Referring to FIGS. 1 and 2 a metering valve comprises a valve member 10 in the form of a valve stem which is axially slidable within an annular metering chamber 11. The metering cha
REFERENCES:
patent: 4271875 (1981-06-01), Meshberg
patent: 4396152 (1983-08-01), Abplanalp
patent: 5037012 (1991-08-01), Langford
patent: 5775321 (1998-07-01), Alband
Thomas Jonathan
Warby Richard John
Bespak plc
Kaufman Joseph A.
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