EP1541498A1 - Aerosolbehälter mit einem vom Treibgas durch einen Kolben getrennten Produkt - Google Patents

Aerosolbehälter mit einem vom Treibgas durch einen Kolben getrennten Produkt Download PDF

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Publication number
EP1541498A1
EP1541498A1 EP04356193A EP04356193A EP1541498A1 EP 1541498 A1 EP1541498 A1 EP 1541498A1 EP 04356193 A EP04356193 A EP 04356193A EP 04356193 A EP04356193 A EP 04356193A EP 1541498 A1 EP1541498 A1 EP 1541498A1
Authority
EP
European Patent Office
Prior art keywords
piston
lip
acrylonitrile
copolymer
styrene
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Withdrawn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
EP04356193A
Other languages
English (en)
French (fr)
Inventor
Sandrine Bourrelly
Franck Flecheux
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.)
Cebal Aerosol France
Original Assignee
Cebal Aerosol France
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 Cebal Aerosol France filed Critical Cebal Aerosol France
Publication of EP1541498A1 publication Critical patent/EP1541498A1/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Withdrawn legal-status Critical Current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 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 present invention relates to an aerosol piston housing, allowing distribute under pressure a liquid to pasty product that must be kept under cover propellant. More particularly, the present invention relates to a casing whose product to be distributed is separated from the propellant by a piston which can slide under the effect of the pressure of the propellant towards the chamber containing said product to be dispensed, while remaining guided by the wall internal cylindrical body housing. The present invention aims to ensure a improved sealing against the propellant gas.
  • said product is introduced with a gas under pressure into said housing, in general already equipped with its dispensing member, typically a valve. Yes when the product is particularly sensitive or viscous, introduces a separator element between the product and the propellant gas.
  • a separator element between the product and the propellant gas.
  • Two Types of separator are generally used: the pocket or the piston.
  • the pocket may have very good barrier properties but its price is high and it tends to trap a significant amount of product at the end of restitution.
  • the piston can mean to restore more than 98% of the product conditioned, but the seal is less good than with a pocket. That this either by passing through the interstices that can be formed at the contact level sliding between the piston and the cylindrical inner wall of the housing (configuration which we will call later "by-pass") or by diffusion through the wall of the piston (a phenomenon which we will call “migration” later), a some amount of propellant eventually enters the chamber intended for the product to be returned. This leak, as small as it may be, can lead to degradation of the most sensitive products, such as for example shaving, which turns into foam in contact with the smallest volume of gas.
  • a metal piston is used (WO 00 03933 CEBAL), a metalloplastic piston, or a piston entirely plastic but generally multilayer, one of the layers having a barrier property to the diffusion of the appropriate propellant gas, for example a copolymer (ethylene-vinyl alcohol) - EVOH - (FR 2 671 540 CEBAL) or still another polyamide, a polyvinylidene chloride (PVDC) - FR 2 713 299 (LE JOINT FRANCAIS).
  • a copolymer ethylene-vinyl alcohol
  • EVOH EVOH
  • FR 2 671 540 CEBAL FR 2 671 540 CEBAL
  • PVDC polyvinylidene chloride
  • a piston whose profile is defined is used.
  • a seal WO 00 03933 CEBAL
  • a product particularly viscous such as a hydrogel resulting from the mixing of a polymer of polyvinyl alcohol and a salt (sodium tetraborate) (US 3,255,936 - COLGATE PALMOLIVE) remains trapped between the piston and the cylindrical inner wall of the housing.
  • International Application WO 95 09785 discloses a composite piston with a double frontal wall which delimits a volume in which a gel is trapped. In this way, the gel follows the piston in its displacement and immediately fills all interstice likely to form between the piston and the cylindrical inner wall housing.
  • a piston with the shape can be used very simple of an inverted cup topped with a cylindrical wall more or less high, whose diameter is slightly smaller than the internal dimensions housing.
  • the cylindrical wall is plated locally against the inner wall of the housing.
  • the product stored in the chamber and located near the inner wall is sheared as and when plunger advance, so that a thin film remains, adhering to said inner wall. It is this thin film of viscous product that serves itself seal.
  • the tightness with the wall of the housing is therefore achieved by the product itself which limits the use of this piston to the most viscous and least sensitive products, because some diffusion to through the sealing layer takes place despite everything.
  • DCC discloses a piston shaped like a deep inverted hollow body having towards its open end a wall cylindrical provided at both ends with two lips, the anterior lip upwards, the posterior lip pointing downwards.
  • the scraping lip must have sufficient flexibility on the one hand to facilitate its contraction initial insertion of the piston into the housing, on the other hand to allow it to follow the slightest relief encountered on the inner wall of the housing (for example of light dents caused during the handling of said housing).
  • the more complex shape of the piston in particular the shape of the soft scraping lips, makes the use of a delicate multi-material plastic (the formatting by thermoforming is poorly adapted, if not impossible; co-injection is long and expensive to set up).
  • the pistons of this type are made by molding a thermoplastic material easily moldable material such as polyolefin - generally polypropylene - whose Barrier properties are very poor.
  • a thermoplastic material easily moldable material such as polyolefin - generally polypropylene - whose Barrier properties are very poor.
  • tightness by-pass of these pistons is actually improved, allowing their use including for low viscosity products but the low Polypropylene barrier properties vis-à-vis the propellant forbid use for the most sensitive products.
  • the piston we will present it by convention such that it is inside the aerosol container, itself considered Conventionally as laid vertically on its base, the device of distribution placed at the top.
  • the front part of the piston and the anterior lip are oriented towards the chamber intended to contain the product.
  • the piston according to the invention is made of a material whose barrier properties to oxygen diffusion are preferably greater than those of polypropylene.
  • the oxygen permeability of polypropylene is expressed in cm 3 O 2 ⁇ m / m 2 / day / bar, typically between 44,000 and 81,000, while the permeability of a polyamide PA6 is about 2000, that of a PET 1600, that of a copolymer (acrylonitrile, methyl acrylate) is between 300 and 600 and that of an ABS of the order of 10,000.
  • the mechanical characteristics of the chosen materials are not very favorable. Indeed, their rigidity is more important. For example, their elasticity modulus in flexion are more than twice as high as that of a polypropylene.
  • the flexural modulus of a polypropylene is 1000 MPa, while that of an ABS is 2500 MPa, a PA6: 2200 MPa, a copolymer (acrylonitrile, methyl acrylate): 3300 MPa, of an A / MMA: 4500 MPa, and a PS / PE mixture: 2700 MPa.
  • the piston according to the invention had a much better seal than the pistons of the prior art, particularly well suited to the distribution of gels of shaving, even slightly viscous.
  • PA polyamide
  • ABS acrylobutadiene styrene
  • the anterior lip is oriented upwards: during the distribution of the product, the user presses the dispensing valve, which puts the chamber containing the product under a pressure lower than the pressure prevailing in the chamber of propellant. Under the effect of this pressure difference the piston is subjected to a force driving it towards the product to be distributed. While moving in this direction, the piston meets the product which, whatever its viscosity, resists and tends to "open" the anterior lip that is pressed against the cylindrical inner wall of the housing and pushes the product in front of it without leaving pass the propellant.
  • the geometry of the lip has been drawn in such a way that we obtain the axial resistance and radial flexibility desired. It is based on a cone that has for axis that of the cylindrical wall of the piston, the angle of the wall with said axis being sufficiently small so that said lip can withstand the forces generated when the product is repelled - the significant axial force resulting from the resistance of the product resulting essentially in a stress of compression. Said lip also has a strong slenderness length / (thickness medium), which allows it to acquire the desired flexibility in the radial direction. In this way, said lip can follow, during the displacement of the piston, the slightest relief encountered on the inner wall of the housing (for example light dents caused during handling of said housing).
  • the end diameter of said anterior lip is, in the state not constrained, greater than the internal diameter of the housing. So, the end the lip is continuously in a state of compressive circumferential stress, in radial support against the cylindrical inner wall of the housing, that is to say in a favorable configuration to drive the product in front of the said lip, regardless of the viscosity of the product.
  • the piston has tendency, under the effect of the pressure difference, to advance towards the product but its inertia may be such that it does not move immediately, at all case that it reacts less rapidly than the anterior lip, thin and flexible.
  • the lip is also subject to this pressure difference and has tends to close (the angle of the cone tends to decrease), thus risking to release a part of the propellant towards the product.
  • the diameter of the housing is preferably between 35 mm and 100 mm.
  • the piston has a front face with a typical average thickness between 0.6 and 1.5 mm, preferably 0.8 mm, and a cylindrical wall with an average thickness typically between 0.4 and 0.7 mm, preferably 0.5 mm.
  • the anterior lip of typical length between 8 and 12 mm, preferably 9 mm, has a substantially constant thickness, slightly decreasing towards its end to facilitate the demoulding, typically ranging from 0.6 mm at its base to 0.4 mm at its end.
  • the concave internal face of the piston is advantageously consolidated by ribs acting as stiffeners. Typically these ribs can be meridian: radial under the front of the piston and axial in its cylindrical part.
  • the cylindrical wall of the piston is provided at its other end. of a posterior lip oriented downwards, of shape also substantially conical, with an apex angle also between 10 ° and 30 °, of preferably between 15 ° and 25 °.
  • the end diameter of said posterior lip is, in the unconstrained state, greater than the diameter internal housing.
  • This posterior lip plays not only a role of stabilization and contribution to the guidance of the piston in its displacement but also a complementary role in improving watertightness, particularly for pistons of larger diameter, whose inertia is important.
  • the anterior lip and the posterior lip delimit indeed a volume of intermediate gas, separated from the propellant chamber, which makes it possible to have a difference lower pressure on both sides of the anterior lip.
  • the phenomenon described above risk of closure of the anterior lip -so of leakage - before the piston advances
  • the posterior lip is slightly thicker than the anterior lip, essentially to better resist mechanically the efforts needed to the threading of the piston in the housing and thus avoid the irreversible formation of folds.
  • the figure represents a piston according to the invention.
  • the housing for receiving the piston is a standard housing, often used for condition hygiene products, such as shaving gels.
  • the piston 10 has a front part 1 in the form of an inverted deep hollow body connected to a cylindrical wall 2 provided at its front end 21 with an anterior lip 3 facing upwards.
  • the anterior lip 3 has a conical overall shape, of substantially constant thickness.
  • the piston 10 is made by molding in one piece of acrylobutadiene styrene (ABS).
  • ABS acrylobutadiene styrene
  • the angle ⁇ of the cone formed by said anterior lip with the vertical axis is close to 10 °, which corresponds to a cone angle of 20 °.
  • the piston 10 has a front face 1 having an average thickness of 0.8 mm, and a cylindrical wall 2 , here quite short (of the order of 10 mm), having an average thickness of 0.5 mm.
  • the anterior lip 3, of length 9 mm has a substantially constant thickness, slightly decreasing towards its end to facilitate demolding, ranging from 0.6 mm at its base 31 to 0.4 mm at its end 32. . the anterior lip 3 therefore has a slenderness ratio length / (average thickness) adjacent to its end 18. at 32, this lip, in the unstressed state, a diameter of about 52.5 mm, greater than the inner diameter of the housing substantially equal to 52.2 mm.
  • the lip end is continuously in a compressive circumferential stress state (corresponding to a circumferential shrinkage of the order of 5 ⁇ ), in radial support against the cylindrical inner wall of the housing, c that is to say in a configuration which is favorable for scraping a very thin product-tight film, even of low viscosity.
  • the cylindrical wall 2 of the piston 10 is provided at its other end 22 with a posterior lip 4 facing downwards, also of substantially conical shape, with an apex angle close to 20 °.
  • the posterior lip 4 has an equal diameter, in the unconstrained state, at 52.6 mm, slightly greater than the internal diameter of the housing.

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)
EP04356193A 2003-12-12 2004-12-10 Aerosolbehälter mit einem vom Treibgas durch einen Kolben getrennten Produkt Withdrawn EP1541498A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0314604A FR2863594B1 (fr) 2003-12-12 2003-12-12 Boitier aerosol a piston, permettant de distribuer sous pression un produit liquide a pateux qui doit etre conserve a l'abri du gaz propulseur, ledit piston
FR0314604 2003-12-12

Publications (1)

Publication Number Publication Date
EP1541498A1 true EP1541498A1 (de) 2005-06-15

Family

ID=34508655

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04356193A Withdrawn EP1541498A1 (de) 2003-12-12 2004-12-10 Aerosolbehälter mit einem vom Treibgas durch einen Kolben getrennten Produkt

Country Status (2)

Country Link
EP (1) EP1541498A1 (de)
FR (1) FR2863594B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007010561A1 (en) * 2005-07-15 2007-01-25 Claudio Bandi Fluid dispensing device
DE202020105342U1 (de) 2020-09-17 2021-12-20 Zima Systems Gmbh Kolben für einen Druckbehälter und Druckbehälter mit einem solchen Kolben

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4234108A (en) * 1977-11-25 1980-11-18 Diamond George B Piston for aerosol container
US5779107A (en) * 1997-01-24 1998-07-14 Clayton Corporation Pressurizable container assembly and piston member therefor
WO2001021507A1 (en) * 1999-09-15 2001-03-29 Dispensing Containers Corporation Aerosol container with a piston

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4234108A (en) * 1977-11-25 1980-11-18 Diamond George B Piston for aerosol container
US5779107A (en) * 1997-01-24 1998-07-14 Clayton Corporation Pressurizable container assembly and piston member therefor
WO2001021507A1 (en) * 1999-09-15 2001-03-29 Dispensing Containers Corporation Aerosol container with a piston

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007010561A1 (en) * 2005-07-15 2007-01-25 Claudio Bandi Fluid dispensing device
DE202020105342U1 (de) 2020-09-17 2021-12-20 Zima Systems Gmbh Kolben für einen Druckbehälter und Druckbehälter mit einem solchen Kolben

Also Published As

Publication number Publication date
FR2863594B1 (fr) 2006-01-13
FR2863594A1 (fr) 2005-06-17

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