EP1107922A1 - Distributeur de produits cremeux sous pression muni d'un piston etanche - Google Patents
Distributeur de produits cremeux sous pression muni d'un piston etancheInfo
- Publication number
- EP1107922A1 EP1107922A1 EP99929462A EP99929462A EP1107922A1 EP 1107922 A1 EP1107922 A1 EP 1107922A1 EP 99929462 A EP99929462 A EP 99929462A EP 99929462 A EP99929462 A EP 99929462A EP 1107922 A1 EP1107922 A1 EP 1107922A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- housing
- seal
- cylindrical wall
- diameter
- 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- Withdrawn
Links
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 or packages with special means for dispensing contents for delivery of liquid or semi-liquid contents by internal gaseous pressure, i.e. aerosol containers comprising propellant for a product delivered by a propellant
- B65D83/60—Contents and propellant separated
- B65D83/64—Contents and propellant separated by piston
Definitions
- the invention relates to housings dispensing pressure products of high viscosity with or without emulsifying gas, to be separated from the propellant gas.
- These are, for example, dispenser boxes for pasty or creamy products, in particular food creams.
- the emulsifying gas used cannot be used as propellant gas.
- a sudden injection at a higher pressure at the end of packaging would cause a sudden change in the structure of the product and would make the dispenser completely ineffective, in any event would distort the desired smoothness of the product.
- a second gas is therefore needed, used as a propellant gas and perfectly separated from the product intimately mixed with the emulsifying gas. When it comes to distributing pasty or creamy food products, nitrogen is chosen as the propellant.
- the product, possibly mixed with an emulsifying gas is in the form of a paste or a highly viscous cream, the viscosity being between 100 and 100,000 centipoises in the temperature range targeted. It is therefore necessary to exert a sufficient propulsion effort to bring out this product.
- the propellant is introduced under a pressure of between 6 and 20 atmospheres at room temperature.
- the sealing of the separation must make it possible to maintain, throughout the use of the housing and when the valve is actuated, a sufficient pressure difference between the chamber containing the product and the chamber of the propellant gas.
- the packaging may impose a sterilization phase before filling the product, the housing being cleaned for example with hydrogen peroxide, and a phase following filling and pressurization, where the housing can be brought to very low temperatures, especially when it comes to ice cream dispenser boxes.
- the housing must be able to ensure good separation between product and propellant in the temperature range: -40 ° C, + 120 ° C.
- these boxes in the case of their use by professionals of the food circuit, that they are refillable, that is to say reusable after sterilization and refilling.
- the pocket case one can choose either a metal pocket or a plastic pocket. Due to the dimensions relating to large capacity boxes (diameter close to 80 mm, height close to 300 mm), it is not economically advantageous to choose metal bags: either they are conventionally produced by impact spinning and in this case they are thick, imperfectly transmit the pressure exerted by the propellant gas and greatly increase the total weight of the housing, or they are manufactured by stamping-stretching according to the method described in French application FR 98 06560 filed by the applicant but the cost of the development of the method and of the tools is not compatible with the limited market corresponding to this type of housing.
- Low density polyethylene has the advantage of being an inexpensive polymer with good resistance to cracking at low temperature but it has the disadvantage of creeping under a low load - of the order of MPa - at 100 ° C.
- the pocket to be produced has such a diameter (typically 40 mm to 80 mm) that it is not possible to make it separately and then to thread it into the already conified case (opening diameter of one inch): it is necessary either to carry it out in situ, or to thread a cylindrical blank into the cylindrical housing blank and then to conify the assembly, for example by following the process described in patent EP 0 547 982 of the applicant.
- the bag is not very tight due to the high gas permeability of polyethylene.
- piston housings Although many of them have been described for many years, no convincing industrial solution has been found. Indeed, no piston known to date can, during the entire use of the housing, that is to say for at least 6 months after packaging, slide freely inside the housing while maintaining effective separation between the product and the propellant, due to the high mechanical and thermal stresses imposed by the specifications set out above.
- Patent 3,255,936 describes a housing intended in particular for the distribution of shaving creams, whipped creams and sugar icings, provided with a piston in the form of an inverted bowl, the periphery of which is extended by a cylindrical skirt covered a hydrogel which allows it to slide in the housing.
- Patent GB 2 015 655 also reveals the difficulties encountered in obtaining a piston which can slide perfectly inside the housing while maintaining a certain seal between product and propellant. It offers a piston also in the form of an inverted bowl extended by a rigid cylindrical skirt provided at its two ends with annular bosses and, in the middle, with two flanges surrounding a foam ring. The first boss, located at the periphery of the bottom, scrapes the internal wall of the housing. The assembly of the flanges and the foam ring is intended to maintain a separation as tight as possible between the chamber containing the product and the chamber containing the propellant gas, subjected to a pressure of less than 9 atmospheres.
- the Applicant has sought to overcome these difficulties and to produce, under economically satisfactory industrial conditions, a housing which makes it possible to distribute under pressure a product whose viscosity is greater than 100 centipoise (or 0.1 Pa.s) - in particular pastry creams. and coolers with a viscosity of between 20,000 and 100,000 centipoises - while keeping the product and the propellant gas separated under an initial pressure of between 6 and 20 atmospheres at ambient temperature, said separation having to remain effective for at least 6 months, said housing being able to be subjected several times to temperatures comprised in the interval (-40 ° C; + 120 ° C).
- the distributor housing according to the invention is a metal piston housing in the form of a bowl extended by a generally cylindrical wall, characterized in that said generally cylindrical wall is provided with a boss at one of its ends and an annular groove, intended to collect a seal at its other end.
- the piston is metallic, which provides an effective barrier to the diffusion of the propellant towards the product. It includes a bottom and a generally cylindrical wall.
- the shape of the bottom of the piston is an inverted bowl. In order to increase the rate of return of the product, it is possible to choose a shape matching that of the dome which supports the valve, by providing a cavity making it possible to accommodate the lower part of the valve and radial channels making it possible to supply this cavity with product. at the end of the piston stroke.
- the height of the generally cylindrical wall of the piston is such that it favors the axial guidance of the piston in the housing.
- This generally cylindrical wall does not come into contact with the internal wall of the housing over this entire height, since contact is ensured at the level of the boss and of the O-ring, each located at one end of said cylindrical wall.
- This configuration can be accentuated by providing a recess between the boss and the seal, the diameter at this level being less than the diameter of the bottom of the piston (hereinafter called the diameter of the piston). This not only makes it possible to reduce the friction forces but also to evacuate, by trapping them, the roughness or particles encountered on the internal wall and liable to hinder the smooth sliding of the piston.
- the boss can be located at the bottom of an inverted cup-shaped shape and the seal can be located at the open end of the cylindrical wall of the piston.
- the Applicant has found that the opposite configuration - seal located at the bottom and boss at the open end of the cylindrical wall of the piston - is more advantageous.
- the seal in direct contact with the product, does not act like a doctor blade on the internal wall of the housing but advances leaving a "shirt", that is to say, using the vocabulary of metal profile spinners, a thin film of product adhering to the wall of the housing.
- this jacket by its presence, contributes to the good sealing of the assembly.
- the boss is located on the open end and essentially serves as an axial guide, its maximum diameter preferably being slightly less than the diameter of the piston, so that the boss is not in contact with the internal wall of the housing over its entire length. circumference.
- the main role of the boss is to guide the piston axially, preventing any jamming of said piston by untimely pivoting.
- the distance between the boss and the groove is preferably greater than the radius of the housing.
- the cylindrical wall of the piston is provided, preferably at the junction with the bottom, with a groove capable of receiving an O-ring.
- the section of the O-ring is arbitrary, the simplest form being the circle.
- the integrity of the seal, therefore the quality of the seal also depends on the shape of the groove. It is particularly necessary to avoid the jamming of the seal during the sliding of the piston by "extrusion" between the internal wall of the housing and the cylindrical wall of the piston, because this jamming risks quickly tearing the seal.
- the groove must have a depth greater than the radius of the seal and a width such that the surface of the section of the groove is greater than that of the section of the O-ring. In this way, the bottom of the annular groove has a straight cylindrical vertical part.
- the side walls must have a geometry unfavorable for the extrusion of the seal between housing and piston during its movement, that is to say be perpendicular to the internal wall of the housing over a sufficient length, for example in making the leave of connection of these walls with the generally cylindrical wall of the piston as low as possible.
- the active part in contact with the internal wall of the housing retains a circular shape - the non-active part in contact with the groove of the piston follows the profile of the groove, the surface of the assembly not having to exceed the section of the groove.
- the quality of the contact between the seal and the internal wall of the housing depends on the differences in hardness, or rather rigidity, between the seal and the piston on the one hand and between the seal and the housing on the other hand. Whether it is the piston or the casing, the Applicant has found that it is above all a question of seeking the best circumferential rigidity: the orthogonal sections of the casing and of the piston may possibly deform elastically, it suffices that the perimeters are retained, provided that the main axes of deformation of the piston and of the housing remain approximately identical. So preferably choose a housing and a piston in a material of the same kind.
- the housing is preferably metallic, like the piston.
- Aluminum alloys are well suited materials for both the housing and the piston. They are possibly different for the piston and the housing.
- the alloys chosen for the piston are preferably part of the group comprising the alloys designated 5182, 5052, 3104, 3105, 3003 and 8011 by the Aluminum Association.
- the piston is obtained for example by stamping or by stamping-drawing then knurling, which makes it possible to obtain, under satisfactory economic conditions, a thin cylindrical wall, of the order of 0.2 to 1 mm.
- a thin cylindrical wall of the order of 0.2 to 1 mm.
- Such a wall is easily elastically deformable but remains circumferentially rigid.
- the O-ring has a section such that it compensates for the respective dimensional variations of the housing and the piston.
- the metal housing is generally produced by impact spinning, or by stamping or stamping-drawing.
- the piston is preferably produced by stamping or stamping- drawing. In this way, the cumulative manufacturing tolerances can reach for the geometries concerned (diameters close to 80 mm) a difference of 0.6 mm, which the O-ring must be able to "absorb" without loss of efficiency in terms of tight separation between the propellant and the product and without risk of pinching between the piston groove and the internal wall of the housing.
- the external leaves of the groove of the piston intended to receive the seal must not be greater than 1.5 mm. So that the seal is not too compressed when the piston is manufactured with a maximum diameter and the housing with a minimum internal diameter, it is preferable to choose an O-ring whose circumscribed diameter of the section is greater than five times , preferably 8 times, the allowable play between the diameter of the piston and the diameter of the internal wall of the housing. Thus for a maximum clearance of 0.6 mm, the circumscribed diameter of the section of the joint must be greater than 3 mm and preferably it will be chosen greater than 4.8 mm.
- the seal must remain housed at the bottom of the piston groove, held between the horizontal side walls of the groove so that it does not roll on itself locally as this would cause significant twists and weaken it.
- the external part of the seal must be able to deform easily under the effect of contact with the internal wall of the housing.
- the section of the seal has a rounded tip, projecting from the diameter of the piston when the seal is placed in the groove. This rounded point shape facilitates radial compression of the joint and the material of the joint can move freely towards the empty part of the groove.
- the volume occupied by the groove must be greater than that of the seal.
- the Applicant recommends for the O-ring an elastomeric plastic or a silicone.
- the elastomeric plastic can be chosen from nitriles, butyls, hydrogenated nitriles, terpolymers (ethylene, propylene, diene), fluoroelastomers, etc., or their alloys or their mixtures.
- the seal can also be made of silicone or of silicone mixed with the preceding elastomeric materials.
- the joint must have a minimum hardness, greater than 45 Shore A., preferably between 45 and 85 Shore A, depending on the viscosity of the product to be packaged. Indeed, to maintain good flexibility allowing the separation to be maintained despite the variable clearance between the housing and the piston, it is desirable that the hardness of the joint does not exceed 85 Shore A.
- seal material To facilitate sliding, additives such as stearins, stearates, erucamides, etc. may possibly be used but they are generally not necessary. With regard to distributors of food creams, the seal material must also be adapted to the requirements of food hygiene.
- Figure 1 shows the piston used for a distributor housing according to the invention.
- Figure 2 illustrates the distributor housing with the metal piston of Figure 1 and a seal.
- Figures 3 to 5 show sections of seals according to the invention. The latter are at rest, juxtaposed with the detail drawing of the groove of the piston and of the wall of the housing, the rounded tip overlapping a part of the housing.
- the piston 1 illustrated in FIG. 1 comprises a bottom 2 in the form of an inverted bowl and a generally cylindrical wall 3. The ends of this wall are provided with a boss 4 on the side of the open end 6 and, at the junction with the bottom 2, an annular groove 5. Intended to receive an O-ring (marked 10 in FIG. 2 ), this annular groove 5 has a radial depth of approximately 4.6 mm and a width L equal to that of the seal 10.
- the surface of the section of the groove is greater than that of the section of the O-ring 10.
- the side walls 9 of the groove 5 are straight and horizontal over a sufficient length, thanks to fillets 11 for connection with the cylindrical wall 3 of several tenths of a millimeter. They keep the internal part of the seal 10 stable at the bottom of the groove 5, that is to say that there is no risk of it rolling over itself locally and of twisting.
- the diameter of the bottom D1 is greater than the diameter D2 of the outer wall of the recess 7 located between the boss 4 and the O-ring 10.
- the boss 4 has a maximum diameter D3 slightly less than the diameter D1 of the bottom, called the diameter of the piston .
- the housing 20, illustrated in FIG. 2 has a capacity of 1.25 liters.
- a shock spinning blank is produced.
- the housing 20 is made of 1050 alloy, has a diameter of 80 mm and a final height of 280 mm.
- the thickness of the cylindrical wall is close to 0.46 mm. Its internal wall is covered with an epoxy varnish.
- a piston 1 identical to that illustrated in FIG. 1 is placed in the housing blank which is then conified to obtain an orifice 21 delimited by a rolled edge 22, on which a valve cup (not shown) is crimped.
- the piston divides the internal volume of the housing into two chambers: the lower chamber
- the dispenser 26 intended to receive the propellant gas and the upper chamber 23, intended to collect the product to be distributed.
- the cream is poured into the chamber 23, while the piston rests on the bottom 24 of the housing.
- the cup fitted with the dispensing valve is crimped on the rolled edge 22 then the propellant gas is injected under a pressure of 15 atmospheres into the lower chamber 26 via the hole in the bottom 24 of the housing, then plugged with a stopper gassing 25.
- the piston was obtained by stamping a sheet painted in 8011. Its thickness is close to 35 hundredths of a millimeter.
- the final shape is obtained by stretching and then molding to obtain the desired profile. Thanks to this shape matching those of the neck of the housing and the bottom of the valve, the bottom 2 allows a very high product restitution rate, greater than 95%.
- the height of the cylindrical wall of the piston, imposing the distance between the seal and the boss, is close to the radius of the housing, which allows good axial guidance.
- the boss has a radial height of 2 mm relative to the surface of the recess 7.
- the diameters D1, D2 and D3 are respectively equal to 78.6 mm, 74 mm and 78 mm.
- the boss has a diameter D3 slightly smaller than the diameter of the piston D1: it is not in continuous contact over the entire periphery with the internal wall of the housing.
- the seal is made of silicone and has a Shore 60 A hardness.
- Three types of seal, shown in FIGS. 3, 4 and 5, have been produced in the context of the invention.
- the joint of Figure 3 has a large section with an outer part with a rounded point, the radius being equal to 2 mm. This seal resists wear well and makes it possible to make up for significant piston-housing clearances. Its seat in the groove gives it good stability and prevents the risks of kinking and pinching of the joint. However, its cost is quite high due to the material used.
- the joint of Figure 5 has a significantly smaller section, with an outer part also in a rounded point, the radius of the rounding being equal to 1 mm.
- the height of the cylindrical wall of the piston is such that it allows the piston to rest on the bottom of the housing in a stable position when filling the product and injecting the emulsifying gas.
- the large surface occupied by the metal bottom of the piston and the small surface occupied by the O-ring make it possible to respect the specific characteristics of the propellant gas and the emulsifying gas throughout the use of the housing, that is to say during the minus 6 months.
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)
Abstract
Description
Claims
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9809321 | 1998-07-17 | ||
FR9809321A FR2781209B1 (fr) | 1998-07-17 | 1998-07-17 | Distributeur de produits cremeux sous pression muni d'un piston etanche |
FR9815558 | 1998-12-07 | ||
FR9815558A FR2781210B3 (fr) | 1998-07-17 | 1998-12-07 | Distributeur de produits cremeux sous pression muni d'un piston etanche |
PCT/FR1999/001683 WO2000003933A1 (fr) | 1998-07-17 | 1999-07-09 | Distributeur de produits cremeux sous pression muni d'un piston etanche |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1107922A1 true EP1107922A1 (fr) | 2001-06-20 |
Family
ID=26234454
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99929462A Withdrawn EP1107922A1 (fr) | 1998-07-17 | 1999-07-09 | Distributeur de produits cremeux sous pression muni d'un piston etanche |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1107922A1 (fr) |
AU (1) | AU4627099A (fr) |
FR (1) | FR2781210B3 (fr) |
WO (1) | WO2000003933A1 (fr) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ATE306441T1 (de) * | 2000-03-15 | 2005-10-15 | Josef Zima | Druckbehälter mit wenigstens zwei kammern |
US7731062B2 (en) | 2000-09-22 | 2010-06-08 | Gebauer Company | Apparatus and method for dispensing liquids |
AU9293901A (en) | 2000-09-22 | 2002-04-02 | Gebauer Company | Apparatus and method for dispensing vapocoolants |
FR2844770B1 (fr) * | 2002-09-23 | 2005-04-22 | Cebal | Utilisation de boitiers pour stocker des produits visqueux a l'abri de l'air ambiant et les distribuer sous forme d'un depot regulier sur un substrat |
BE1016138A3 (nl) * | 2002-11-25 | 2006-04-04 | Cruysberghs Rudiger | Cilindervormige verpakking. |
US6880732B2 (en) | 2003-01-15 | 2005-04-19 | Christian T. Scheindel | Piston for pressurized container |
EP2756108A4 (fr) | 2011-09-16 | 2016-03-09 | Ball Corp | Contenants filés par choc à partir de déchets d'aluminium recyclés |
GB201222928D0 (en) | 2012-12-19 | 2013-01-30 | Oxford Nanopore Tech Ltd | Analysis of a polynucleotide |
MX2015013932A (es) | 2013-04-09 | 2016-06-06 | Ball Corp | Botella de aluminio extruida por impacto con cuello roscado hecha de aluminio reciclado y aleaciones mejoradas. |
CA3048957C (fr) | 2016-12-30 | 2023-01-03 | John L. Siles | Alliage d'aluminium pour recipients extrudes par choc et procede pour le fabriquer |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3255936A (en) | 1964-01-03 | 1966-06-14 | Colgate Palmolive Co | Pressurized dispensing container |
AU536267B2 (en) | 1978-03-01 | 1984-05-03 | Henri-Hean-Joseph Schumacker | Aerosol dispenser |
EP0547982B1 (fr) | 1991-12-17 | 1995-09-06 | Cebal S.A. | Procédé de fabrication d'un corps de distributeur à poche en métal, corps de distributeur et distributeur correspondant |
FR2705951B1 (fr) * | 1993-06-04 | 1995-08-11 | Oreal | Ensemble de distribution comprenant un récipient cylindrique comportant un piston. |
FR2709738B1 (fr) * | 1993-09-10 | 1995-11-10 | Oreal | Procédé et dispositif de distribution et de conditionnement d'un produit fluide contenu dans un récipient pressurisé à l'aide d'un gaz propulseur. |
-
1998
- 1998-12-07 FR FR9815558A patent/FR2781210B3/fr not_active Expired - Fee Related
-
1999
- 1999-07-09 AU AU46270/99A patent/AU4627099A/en not_active Abandoned
- 1999-07-09 EP EP99929462A patent/EP1107922A1/fr not_active Withdrawn
- 1999-07-09 WO PCT/FR1999/001683 patent/WO2000003933A1/fr not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO0003933A1 * |
Also Published As
Publication number | Publication date |
---|---|
AU4627099A (en) | 2000-02-07 |
FR2781210B3 (fr) | 2000-08-18 |
FR2781210A1 (fr) | 2000-01-21 |
WO2000003933A1 (fr) | 2000-01-27 |
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