Dispensing – Collapsible wall-type container – Nonmetallic
Patent
1993-12-07
1995-12-26
Kashnikow, Andres
Dispensing
Collapsible wall-type container
Nonmetallic
222 95, 383107, B65D 3528
Patent
active
054779855
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The subject of the present invention is a liquid to pasty product dispenser with a deformable bag. More precisely, it relates to a dispenser comprising a container inside which is located a bag made from an easily deformable plastic compound, without an air intake. A base carrying a dispensing member is generally held mechanically with respect to the container. The constituent material of the bag must be very flexible and of a very small thickness so as to have a very small extent of shape memory to allow the bag to be emptied totally even when the dispensing member comprises a hand pump which, as is known, works better the smaller the depression in the bag, the bag being one without an air intake when, in particular, the products contained in the bag are sensitive to air; this is the case, for example, with cosmetic products.
BACKGROUND OF THE INVENTION
FR-A-2,648,794 discloses such a dispenser of the sort in which the bag is formed from a sheath obtained by welding, along at least one longitudinal band, the longitudinal edges of a strip, the peripheral length of the cross section of the sheath being substantially equal to the peripheral length of the base, the longitudinal band of weld intersecting a band of weld at the bottom end in a region which is distinct from the ends of the band of weld at the bottom end. The bag is fixed to the base by crimping which presents the risk of damaging the relatively fragile plastic compound, particularly when its thickness is small so that it is easily deformable. Furthermore, sealing at the level of this fixing by crimping needs to be improved.
U.S. Pat. No. 3,662,926 discloses a dispenser with a deformable bag produced from a flexible tube which does not have a longitudinal band of weld. The bag is fixed by welding onto the base. The welding poses no major problem in this case because the bag is not made from a plastic compound and does not include a longitudinal band of weld, which would constitute an excess thickness.
SUMMARY OF THE INVENTION
The invention aims to produce a dispenser in which the product is particularly sheltered from the air, it being necessary for this dispenser to enable practically the whole bag to be emptied. The material of the bag must therefore be particularly airtight, which may be obtained by employing a compound multi-layer material. The securing of the bag to the base must also be completely airtight. It is furthermore desirable for the manufacture to remain simple and reliable.
The subject of the present invention is therefore a liquid to pasty product dispenser comprising a container inside which is located a bag made from an easily deformable plastic compound, without an air intake, a base carrying the dispensing member being mechanically held with respect to the container, a bottom end of the bag being welded along a band, in which dispenser the bag is formed from a sheath obtained by welding, along at least one longitudinal band, the longitudinal edges of a strip, the peripheral length of the cross section of the sheath being equal to the peripheral length of the base, the longitudinal band of weld intersecting the band of weld at the bottom end in a zone which is distinct from the ends of the band of weld at the bottom end, characterized in that: the strip to the inner face of the other longitudinal edge of the strip, the welded faces being situated on the same side of the strip, back against the outer surface of the sheath and welded in this position by the weld for welding the end of the bag onto the weld surface of the base.
Preferably, the weld surface at all points has a radius of curvature greater than 0.5 mm.
The strip from which the bag is formed may have a thickness of between 20 and 200 microns.
Advantageously, the bag is made from a compound material consisting of at least three layers, amongst which there is an internal layer welded directly onto the weld surface of the base and an external layer intended for the mechanical protection of the bag.
The internal layer and/or the external lay
REFERENCES:
patent: 3662926 (1972-05-01), Umstead
patent: 4189069 (1980-02-01), Stoody
patent: 5031384 (1991-07-01), Rebeyrolle et al.
patent: 5078509 (1992-01-01), Center et al.
patent: 5139168 (1992-08-01), Gueret
patent: 5161718 (1992-11-01), Gueret
"L'Oreal"
Douglas Lisa
Kashnikow Andres
LandOfFree
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